Bending press for sheet material bending

FIELD: metallurgy.

SUBSTANCE: bending press has vertical middle plane and contains movable one relative to another upper table, lower side of which carries first bending tools, and lower table, upper side of which carries second bending tools. Also, one of the tables has two slits along its whole thickness positioned symmetrically relative to a middle plane. Each slit has the first edge, the second edge, the first open end coming out to a side edge of the table and also a blind end. At least one stop is located in each slit. Each stop has the first edge with the first facet attached to the first edge of the slit and the second facet forming the first surface, and also the second wedge with the first facet attached to the second edge of the slit and the second facet forming the first surface. The first surface of at least one wedge has a middle section projecting relative to other sections to facilitate contact between the wedges.

EFFECT: raised quality of bending.

15 cl, 15 dwg

 

The technical field to which the invention relates.

The present invention relates to a bending press or sheet metal stamping press" with tables with controlled deformation.

The level of technology

Bending presses are machines, which themselves are well known. As shown in figure 1, this type of machine contains the lower table 12 and table top 14, is movable relative to the table 12. Often the lower table 12 is stationary, and the upper table 14 can move up to the bottom of the table under the action of the power cylinder V1and V2that affect the edges 14a and 14b of the upper table. Usually at the bottom of the table 12 has a free side 12A, provided with fastening means 16 for bending matrices 18. In the same way fitting 14 with the top of the table 14 is equipped with fastening means 20 for bending punches 22.

Metal sheet F or the package is placed on a bending matrix 18 of the lower table 12. Sheet F may have a variety of length L depending on the destination. Under the action of the pistons of cylinders V1and V2mounted on the upper table, the punches 22 are approaching the metal sheet F, placed on the matrices bottom of the table. After contact of the plug 22 with the metal sheet F power pressure begins to increase and the punch zadumivaetsa in sheet metal, deforming it first in the field pack is ugogo deformation, and then in the field of plastic deformation, which allows to obtain irreversible bending of sheet metal.

Due to the fact that the force is transferred to the upper table-cylinder V1and V2that affect the edges of the table, the linear load is distributed between two edges of tables, creates a linear deformation of the top of the table in the form of a concave arc with the maximum deformation near the mid-plane of the table. This means that at the end of the bending process of the Central group of the punch is pressed into the sheet metal is less than the marginal groups. If the floppy was performed on the matrix, in which the bending process is perfectly straight, it would be an item with a more obtuse angle bend in the Central part than at the edges. Of course, such a result is unacceptable.

To eliminate this drawback, it was proposed various solutions to control deformation of the edges of tables with various tools with the aim of obtaining a uniform flexible along the entire length of the bending of the workpiece.

Most often these solutions include the implementation of slits, such as slits 24 and 26, shown in figure 1 and is made in the lower table 12 symmetrically relative to the Central plane R R press. In this case, these slots 24, 26 define a Central area 28 of the lower table 12, in which the slits are absent, and to ora has a length b, two slots 24 and 26 have length and.

In the presence of the slots 24 and 26 of classical type, that is, when between them remains the site 28 length b without slots, the edges of the upper and lower tables 14 and 12 are deformed essentially in parallel. This ensures proper flexible. However, this result is obtained only when intended for flexible package or a metal sheet F has a length essentially equal to the total length of the bottom or top of the table 12 or 14. Otherwise, when the sheet length F is less than the total length of the bottom or top of the table 12 or 14, and the lower and upper table 12 and 14 being deformed, to form a concave surface.

In addition to the difficulties of creating a bending press, in which when bending a metal package or sheet F is implemented essentially uniform deformation along the length of the package or sheet regardless shorter cutting length tables 12, 14, or Vice versa, is equal to the length of the tables 12, 14 of the press, there is an additional problem related to the deformation of the upper edges 24", 26" of the slots 24, 26, when the bending force from the movable table 14 is applied to the stationary table 12 and a specified force is perceived lower edges 24', 26' of the slots 24, 26.

Disclosure of inventions

The present invention is to eliminate these two problems by placing in each of the two about which of iesi, at least one stop is made of two elements or wedges, which have a first surface secured to the respective edges of the slots, and the second surface adapted to local mutual contact, essentially, on the middle sections of these wedges, so that to ensure the effective transmission of bending forces with the upper edges of the slots at their lower edges.

Thus, according to the present invention offers a bending press for bending at least one metal sheet, containing the upper table, the underside of which carries the first bending tools, and the lower table, the upper side of which carries the second bending tools, and these two tables are movable relative to each other to transfer forces to a flexible metal sheet, while the press has a vertical middle plane, one of the tables provided throughout its thickness two slots arranged symmetrically relative to the Central plane, each slot has a first edge, a second edge, an open first end, which faces the side edge of the table, and a hollow end, each of the slots is at least one stop, each stop contains the first wedge, which has a first edge attached to the first Kronk the slots, and the second face forming the first surface and the second wedge, which has a first face attached to the second edge of the slot, and the second face forming the first surface. The first surface, at least one of these wedges contains the middle portion, the speaker relative to other areas specified surface so that contact between the first and second wedge is mounted essentially at the specified average plot.

The expression "attached to the first/second edge means that the wedge, in question, is attached to the first or second edge, it should be understood that the wedge can be movable relative to the specified edge of the slot.

Other distinctive features relevant to the invention the bending press is listed below.

The first surface of the first wedge and the first surface of the second wedge contain the respective middle sections of that act in relation to other sections listed first surface that is preferred.

In one embodiment, the first surface of the first wedge and/or the first surface of the second wedge are convex surface.

In another embodiment, the first surface of one of the wedges is a concave surface, while the first is I the surface of the other wedge is a convex surface.

In yet another embodiment, the first surface, at least a first wedge and/or the second wedge is part of a spherical surface.

Preferably, in the absence of a bending force generated for flexible metal sheet F, at least in the region of the stops these cuts had a constant height, so that the first edge and the second edge are parallel to each other.

Preferably, the first surface of the wedges were tilted relative to the parallel edges of the slots.

It is desirable that the slope of the first surface about an axis parallel to the edges of the slots lying in the range from 1 to 40%, and optimally in the range of from 5 to 10%.

In one embodiment, the first surface, at least one of the wedges, the first and the second consists of several peripheral sections of inclined planes, connecting with the middle section.

The average height of the speaker of the plot lies in the range from 0.05 mm to 0.25 mm relative to other parts of the first surface of the wedge with a length essentially equal to 80 mm

Preferably, the wedges were mounted on holders that are attached to the respective edges of the slots, and so that at least one of the holders was made with the possibility of transverse displacement, i.e. the displacement is placed along the axis, parallel to the parallel edges of the slot in which you installed the specified movable holder.

According to the invention the two wedge can be displaced relative to each other in the transverse direction, i.e. along an axis parallel to the parallel edges of the slot.

According to the invention in the absence of a bending force generated for flexible metal sheet F, between the first and second wedge may be a gap.

It is preferable that a bending press contained several stops located in the respective slots symmetrically relative to the Central plane R R.

Brief description of drawings

Other distinctive features and advantages of the present invention are described in greater detail in the subsequent description of preferred examples of embodiments, which are not restrictive. Description accompanied by the attached drawings, on which:

figure 1 depicts a bending press, containing two slits, which extend from respective sides of the middle plane R R and go from opposite sides of the bottom of the table.

figure 2 schematically depicts an implementation option stops, which is made of two corresponding to the invention wedges, and one of the wedges attached to the upper edge of the slot 24 or 26, and the other attached to the bottom kr is the MCA slots 24 or 26;

figure 3 schematically depicts two stops, equipped with a control system with a mechanical actuator (motor) for regulating the size of the gap in the lugs;

figure 4-7 schematically depict embodiments of the stop is made of two wedges, which are initially in contact with each other;

Fig depicts the side view corresponding to the invention the wedge lock;

Fig.9-12 depict various embodiments of the first surface or the contact surface of the wedge lock corresponding to the present invention;

Fig schematically depicts a field of forces or pressures acting wedges stops corresponding to the present invention, when the metal sheet F is applied bending force, resulting in contact of the wedges and transfer force F0between them;

Fig depicts in a perspective projection of the wedge, the first or the contact surface of which is made of three sections;

Fig depicts a side cross section of the two wedges (one under another), identical to the wedge on Fig.

The implementation of the invention

Figure 2 in section depicts two wedges 28, 29 corresponding to the invention the stop 27. These two wedges 28, 29 are respective first contact surfaces 28', 29', between which is up to the application of bending effort F0there is a gap J, which is also the cauldron figure 5 and 15.

Each of the wedges 28, 29 mounted on a respective holder 40, 41, connected with the corresponding edge 24', 26' or 24", 26", respectively, one of the slots 24 and 26. The functional purpose of each wedge 28, 28', 29, 29' / the stop 27 to control the degree of convergence of the edges 24', 24" and 26', 26" of each of the slots 24, 26, when the application of bending forces. Controlling the degree of convergence of the edges 24', 24" and 26', 26" of the slot 24 or 26, it is possible to control the deformation of the upper edge 24", 26" slots 24, 26 and, therefore, deformation of the upper edge 12A of the lower table 12.

At least one of the holders 40 and 41 (and, as an option, and both holders 40 and 41) set(s) with the possibility of lateral movement, i.e. movement along an axis parallel to the parallel edges 24', 26' and 24", 26" of the slots 24, 26 on which these holders are installed. In the example shown in figure 2 and 3, is provided by the movement of the holders 40 through a set of actuators 60, and the holders 41 fixed to the edges 24", 26" of the slots of the lower table 12. These holders 40 are driven by a set of actuators 60, which is shown in figure 3 and which are connected with movable holders 40 through the connecting levers 61. Managing a set of actuators 60 is performed by the remote unit from the management (not shown). Moving the holders 40 from mechanical actuator and, thus, movement of the wedges 29 gives the possibility to adjust the position of at least one of the wedges 29 relative to the wedge 28 when the intent of the application of bending effort F0. This adjustment sets the amount of gap J, it should be understood that the initial setting of the relative position of the wedges 28, 29 (before the application of bending effort F0) may not include any gap, i.e. the wedges 28, 29 may abut each other. By means of the actuators 60, the clearance J between the wedges 28, 29 or the relative position of the wedges 28, 29 can be adjusted by 1/100 of a millimeter.

Naturally, you can ensure that the set of actuators 60, or a separate drive mechanism could be set in motion and the holders 41, and hence the wedges 28. For example, on Fig shows the wedge 28, 29, which are visible screw holes 71, 72, 73 (holes 71, 72 are visible from the side and the hole 73, located on adjacent faces, shown in broken lines in the thickness of the wedge). These holes are for mounting wedge 28 or 29 rolling stock holder 40 or fixed to the holder 41 conventional mechanical means such as a screw or a pin.

To the transverse movement occurred only in the AGS, the reduced range, the holders 40 are equipped with grooves 62 that are linearly stretched, and define the axis along which move the holders 40. Inside grooves are guide pins 63, which includes planting in these grooves 62. In the ideal case, the movement of the holders 40 and wedges 29 is parallel to the edges 24', 26' of the slots 24, 26. It should be noted that in the preferred embodiment, the edges 24', 24" and 26', 26" of each of the slots 24, 26 are parallel to each other, at least in the area of the wedges 28, 29 / lugs 27.

In the optimal case, the first surface 28', 29' of each of the wedges 28, 29 have a bias with respect to the axes or planes parallel edges 24', 26' and 24", 26" of the slots 24, 26. The specified slope of the first surface 28', 29' of each of the wedges 28, 29 is in the range from 1 to 30% depending on the material from which made the wedges 28, 29, or, more precisely, the friction coefficient of the material forming the contact surface 28', 29' of each of the wedges 28, 29. Thus, for example, you can see that the slope of each of the wedges shown in figure 2 and 3, is in the range from 2 to 10%, while for the wedges 28, 29, as shown, for example, 6, 13 or 14, the specified slope is in the range from 10 to 30%. It should also be noted that the slope of the wedges 28, 29, which are in contact with each other, may be the same or may differ slightly.

Important the SPECT of the present invention is that, at least one of the first surfaces or contact surfaces 28', 29' is provided a barrel-shaped or convex middle portion 30, 31, so that the contact between the first and second wedges 28 and 29 is mounted essentially on the specified middle part 30 or 31.

This barrel-shaped or convex middle portion 30, 31 can have different shapes and may be present on only one of the two wedges 28 or 29 or both of the wedges 28, 29. In addition, as will be discussed below for various embodiments of the invention, depending on the form of barrel-shaped or convex section 30, 31 each of the first surfaces 28', 29' of the wedges 28, 29 contact between the wedges 28, 29 may have a point, or essentially at the point, line or area.

In figure 4, each of the wedges 28 and 29 has a barrel-shaped or convex middle portion 30, 31, which forms the contact zone of the two wedges 28, 29. In this example, the lower wedge 29 is located closer to the open end 26a of the slot 26, the upper wedge 28, so that between the wedges 28, 29 there is a small lateral displacement. In the above example, the first surface 28', 29' of each of the two wedges 28, 29 consists of a spherical surface, but the top S of the spherical surface of each of the two wedges 28, 29 is not located exactly in the middle of the first surface 28', 29'. Therefore, the two to the ina 28, 29 is slightly shifted in the transverse direction relative to each other and the contact between them (original and/or during application of bending effort F0for flexible sheet F) it is possible for the middle sections 30, 31.

Of course, this way of arranging the wedges 28, 29 relative to each other depends on spherical sections of the two first surfaces 28', 29' of the wedges 28, 29, but also from the bending of the upper part 12 of the lower table 12 and, thus, the degree of movement of the upper wedge 28.

In General, it should be noted that the reference position of the top of barrel-shaped or convex middle section 30, 31 taken relative to the plane P0passing through two opposite edges 80, 81 of the wedge 28, 29, which corresponds to the inclination of the wedge 28, 29. Vertex S is a point barrel-shaped or convex middle section 30, 31, the most remote ("serving") from the plane of the P0. The plane of the P0shown in Fig and 15, which presents the latest variant embodiment of the invention. From Fig can be seen that the plane of the P0passes through two opposite edges 80, 81. The top's barrel-shaped or convex middle section 30, 31 may be located at one edge of the specified area, as shown in Fig. The maximum height of the peaks of S denoted by the index h. On Fig shows that essentially all pally the middle portion 30, 31 has a height h relative to the plane P0. And it is also clear that because of the tilt of the first surfaces 28', 29' of the wedges 28, 29 vertex S of the convex section 30, 31 do not necessarily coincide with the point of the first surface 28', 29', which is furthest from the edge 26', 26" slots, which are attached to the wedge 28, 29.

Figure 5 shows a variant of figure 4. In this example, the lower wedge 29 is located farther from the open end 26a of the slot than the upper wedge 28, so that again there is a slight lateral displacement between the two wedges 28 and 29, but in this case, the wedges are shifted backward when compared with figure 4. In addition, in the initial state in the absence of efforts on the part of the power cylinders of the V1V2between the first surfaces 28', 29' there is a gap In J. embodiment, presented on figure 5, as in the variant shown in figure 4, the geometry of convex middle section 30, 31 each of the first surfaces 28', 29' of each of the wedges 28, 29 and lateral displacement of the two wedges 28, 29 relative to each other is selected so that during application of bending force to the metal sheet F contact of the two wedges 28, 29 occurred in their respective barrel-shaped or convex middle sections 30, 31.

Figure 6 and 7 shows the bending force F0for flexible metal sheet F, with which the society leads to bending of the upper section 12 with the bottom of table 12, so the top edge 26" of the slot 26 is moving closer to the bottom edge 26' of the same slot 26.

And again on these two figures 6 and 7, the wedges 28 and 29 are displaced relative to each other in the transverse direction. In the embodiment, figure 6 only the wedge 29 has a first surface 29' spherical or convex middle section 31, for example spherical or flat serving surface. The contact between the wedges 28, 29 of the wedge 29 is performed by its barrel-shaped or convex section 31. It should again be noted that the barrel-shaped or convex middle portion 31, there is only one of the two wedges 28 or 29; however, it is preferable that the convex middle portion 31 was at the bottom of the wedge 29, which is attached to the bottom edge 26' of the slot 26. The wedges 28, 29 with their exposed middle sections 30 and/or 31, and their relative lateral displacement designed to compensate for nparalleled edges 24', 24" and 26', 26" of the slots 24 and 26.

An implementation option, depicted in Fig.7, the same as option 4, but 7 shows how bent the upper part 12 with the bottom of the table at Annex bending effort F0and how does the transfer of this effort on the lower part of table 12.

On Fig apart threaded holes 71, 72 and 73, which are used for mounting wedge 28 or 29 to the bracket 40, 41, shows the first surface 28', 29' is AK, as they are seen from the side, with the naked eye is difficult to see their barrel-shaped or convex middle portion 30, 31. This is due to the fact that the first surface 28', 29' of the wedge 28, 29 is a spherical surface, the radius of curvature of which is very large compared to the length of the wedge 28, 29. For example, the wedge 28, 29 on Fig has a length in the range of 60 mm to 80 mm, and the radius of curvature of each of the first surfaces 28', 29' lies in the range from 7000 mm (or 7 m) up to 9000 mm (or 9 meters). The protrusion, i.e. the maximum height of the middle section 30, 31 relative to the clipping plane of the first surface that passes through a line connecting opposite edges 80, 81 of the first surface 28', 29', lies in the range from about 0.05 mm to 0.25 mm, So the maximum height or protrusion barrel-shaped or convex section 30, 31 is in the range from 0.05% length (maximum size) of the first surface 28', 29' to 0.4% of the specified length (when the slope of the first surface is not very large, it can reasonably be considered that the length of each of wedges equal to the length of the first surface), and optimally, to the specified maximum height or protrusion was in the range of from 0.1% of the length of the first surface 28', 29' of the wedge 28, 29 to 0.3% of the length. It is clear that the difference between the height of the barrel-shaped or convex section 30, 31 it is often impossible to see newour the right eye, and on the attached drawings for simplicity and clarity, the middle portion 30, 31 intentionally depicted increased.

Figure 9 shows the wedge 28, 29, the first surface 28', 29' which is essentially cylindrical and concave. In this example, the first surface 28', 29' of the wedge 28, 29 provided by the bulge formed by the barrel-shaped or convex middle section 30, 31 of the wedge 28, 29. This bulge may consist of a spherical surface, which is relative to the first surface 28', 29', which in cross section has essentially a cylindrical shape.

The wedge 28, 29, shown in figure 10, contains an inclined cylindrical first surface 28', 29'. The center Of the sphere, which is part of the first surface 28', 29' of the wedge 28, 29, offset relative to the vertical V, drawn from the center of the first surface 28', 29' (the vertical line crosses the lower plane formed by the first face attached to the first edge of the slot 24' or 26'). In this example, the center of the first surface 28' or 29' of the wedge 28 or 29 forms a point contact with the first surface 28' or 29' of the other wedge 28 or 29. Therefore, when the first surface 28' or 29' has a spherical section, the contact with the first surface 28' or 29' of the other wedge 28 or 29 regardless of the form will occur at the point or essentially at the point. Thus, the contact surface 28', 29 between the two wedges 28, 29 is very small, and taking into account the manufacturing tolerances of the wedges 28, 29 and materials specified area is about 1 mm2. In the General case, such a point or "essentially point contact of the two wedges 28, 29, alternatively, may take place in the center of each of the first surfaces 28', 29' of the wedges 28, 29, but, as explained above, the contact of the two wedges 28, 29 depends on their respective tilt and mutual offsets, as well as from the movement of the upper edge 28 for the application of a bending effort F0for the implementation of flexible sheet metal F.

Figure 11 shows a variant implementation of the first surface 28', 29' of the wedge 28, 29. In this embodiment, the middle portion 30, 31 is formed of a flat surface. In this form the middle portion 30, 31 is a rectangle or square, occupying 5% of the total area of the first surface 28', 29' up to 25% of all of the specified area, and optimally from 10 to 15% of the total area. In this example, the first surface 28', 29' of the wedge 28, 29 includes four peripheral inclined flat section 33, 34, 35 and 36, extending from the respective four edges of the first surface 28', 29' to the middle section 30, 31. In this example, in which the middle portion 30, 31 is a flat surface contact with the first surface 28', 29' of the other of the wedge 28, 29, the middle portion of which is a flat surface (the AK variant, the first surface 28', 29' of the other of the wedge 28, 29 may be identical to the first surface of the wedge 28, 29, shown figure 11)occurs in the space between the two wedges 28 and 29.

On Fig and 15 shows a variant embodiment of the invention, in which the contact between the two first surfaces 28', 29' of the two wedges 28, 29 also occurs in area. As shown in these figures, the first contact surface 28', 29' is, essentially, an angled surface, i.e. the opposite edges 80, 81 have different height. In addition, the first surface 28', 29' of the wedges 28, 29 contains three consecutive segment 40, 30 or 31 and 42, each of which occupies the entire width of the wedge and has its own individual slope - the slope of the segments 40, 30 or 31 and 42 increases from segment 40 to the segment 42. The intermediate or middle segment forms a medium or protruding section 30, 31. With respect to the plane 50 passing through opposite edges 80, 81 of the wedge 28, 29, the middle portion 30, 31 has a maximum height h is about 0.1 mm, As can be seen from Fig, two wedges 28, 29, slightly offset relative to each other, identical to each other but have opposite orientation of their respective first surfaces 28', 29', so that only the middle sections 30, 31 facing each other and essentially parallel to each other. Because of the mutual displacement of the two wedges 28, 29 only the hour is ü middle section 30, 31 each of them comes in contact with the relevant part of the middle section of another wedge, when this contact occurs on the area. It should be noted that in this example in original condition between the two wedges 28, 29 there is a gap J.

On Fig shows a third possible mode of contact between the two wedges 28, 29, namely the contact line (linear contact). The first two modes is the point (or "essentially point contact and the contact area. In this example, selected to illustrate the contact of the third type, only the wedge 28 has a protruding middle portion 31. In this case, the first surface 28', 29' of the wedges 28, 29 are cylindrical, but while the first surface 28' is based on a concave cylindrical surface, so that the first surface 28' is relative to the plane passing through the opposite edge of the wedge 28, the first surface 29' is based on a convex cylindrical surface, so that the first surface 29' forms a trough with respect to the plane passing through the opposite edges 80, 81.

In addition, the center d of the cylindrical surface on which rests the first surface 28', is closer to the specified surface 28'than the center Oz cylindrical surface, which supports the first surface 29'. Thus, the radius of the cylinder is, part of which is formed by the first surface 28', is less than the radius of the cylinder, part of which is formed by the first surface 29'. That is why only the top of the middle section 30 of the first surface 28' is in contact with the first surface 29' of the wedge 29 across its width, so that the contact between the wedges 28, 29 is a linear contact.

On Fig shows the line of action of forces upon the application of bending effort F0for flexible metal sheet F. the Line of action of forces converge or down from the first face of the wedge 28, which is attached to the edge 26" of the slot 26, in the direction of the speaker of the middle section 30 of the first surface 28' of the wedge 28, which is in contact with the protruding middle section 31 of the first surface 29' of the wedge 29; then the line of action of forces distributed over the entire width of the wedge 29. In this example, the first surface 28', 29' of the wedges 28, 29 are spherical or cylindrical, so that the contact occurs, respectively, point, essentially a point or line. The wedges 28, 29 can be made of hardened steel, while the lower table 12 can be made of mild steel, thus in the absence of plastic deformation is possible to have a high unit pressure between the wedges 28, 29, but low between the wedges 28, 29 and the lower table 12.

Naturally, the contact between the first surface is s 28', 29', which was mentioned as a point contact or linear contact is the initial contact that occurs during or at the beginning of application of force F0because since the advent of a point or line contact pressure of the upper wedge 28 on the lower wedge 29 is such that the first surface 28', 29' of the wedges 28, 29 are in the state, at least, the elastic deformation and the contact zone is expanding. It is desirable that when the application's efforts F0for example, a value of 200 kN, the contact zone was approximately 20% of the total area of each of the first surfaces 28', 29' of the wedges 28, 29 to 50% of the said total area.

In accordance with the present invention the center of the first surface 28', 29' may be a Central barrel-shaped or convex middle section 30, 31, that is, the center of the speaker of the middle section 30, 31 may coincide with the geometric center of the first surface 28', 29' of the wedge 28, 29, but it is also possible to provide that the specified barrel-shaped or convex middle portion 30, 31 was slightly offset relative to the center of the first surface 28', 29'. Such an implementation option, for example, shown in Fig.7, in which the barrel-shaped or convex middle portion 31 is slightly offset from the center of the first surface 28', 29' of each of the wedges 28, 29, so that the protrusion or the maximum height of renegociate 30, 31 does not coincide exactly with the geometric center of the first surface 28', 29' of each of the wedges 28, 29. This offset or eccentricity of the projection section 30, 31 relative to the center With each of the first surfaces 28', 29' is relatively small, for example, wedge 80 mm long it is in the range from 2 mm to 10 mm Such eccentricity or offset of protrusion of the middle section 30, 31 relative to the center of the first surface 28', 29' may be in the range from 0 to 40% of the length of the wedge 28, 29.

A possible variant embodiment of the invention, in which the wedges 28, 29 are identical, i.e. their sizes are the same and the first surface 28', 29' are identical in terms of shape and size.

However, as already mentioned in respect to the various accompanying drawings, it is also quite possible that when the two wedges 28, 29 are not identical, i.e. the first surface 28', 29' are significantly different, or, alternatively, only one of the first surfaces 28', 29' of the wedges 28, 29 has a barrel-shaped or convex middle portion 30, 31.

1. A bending press for bending at least one metal sheet, containing the upper table, the underside of which carries the first bending tools, and the lower table, the upper side of which carries the second bending tools, and these two tables are movable relative to each other to transfer forces flexible is a metal sheet, when this is specified, the press has a vertical middle plane, one of the tables provided throughout its thickness two slots arranged symmetrically relative to the Central plane, with each slot has a first edge, a second edge, an open first end that extends to a lateral edge of a table, and a hollow end, each of the slots is at least one stop, each stop contains the first wedge, which has a first edge attached to the first edge of the slot, and the second face forming the first surface and the second wedge, which has a first face attached to the second edge of the slot, and the second face forming the first surface, the first surface, at least one of these wedges contains the middle portion, the speaker relative to other areas specified surface so that contact between the first and second wedge set, substantially as specified average plot.

2. A bending press according to claim 1, characterized in that the first surface of the first wedge and the first surface of the second wedge contain the respective middle sections of that act in relation to other sections of these first surfaces.

3. A bending press according to claim 1, characterized in that the first surface of the first wedge and/or the first powernetwork wedge are convex surface.

4. A bending press. claim 1, characterized in that the first surface of one of the wedges is a concave surface and the first surface of the other wedge is a convex surface.

5. A bending press according to claim 1, characterized in that the first surface of the first wedge and/or the first surface of the second wedge is part of a spherical surface.

6. A bending press according to claim 1, characterized in that in the absence of a bending force generated for flexible sheet metal, at least in the region of the stops these slots have a constant height, so that the first edge and the second edge are parallel to each other.

7. A bending press according to claim 6, characterized in that the first surface of the wedge is inclined relative to the parallel edges of the slots.

8. A bending press according to claim 7, characterized in that the slope of the first surface about an axis parallel to the edges of the slots lies in the range from 1% to 40%, preferably in the range from 5% to 10%.

9. A bending press according to claim 1, characterized in that the first surface, at least one of these wedges consists of several peripheral sections of inclined planes, connecting with the middle section.

10. A bending press according to claim 1, characterized in that the height of the middle of the speaker of the plot lies in the range from 0.05 mm to 0.25 mm relative to the tion of other portions of the first surface of the wedge length, essentially equal to 80 mm

11. A bending press according to claim 1, characterized in that the wedges are installed in holders attached to the corresponding edges of the slots.

12. A bending press according to claim 11, characterized in that at least one of the holders is made with the possibility of lateral movement, that is, movement along an axis parallel to the parallel edges of the slot in which you installed the specified movable holder.

13. A bending press according to claim 1, characterized in that the said two wedges are displaced relative to each other in the transverse direction, that is, along an axis parallel to the parallel edges of the slot.

14. A bending press according to claim 1, characterized in that in the absence of a bending force generated for flexible sheet metal, between the first and second wedge a gap.

15. A bending press according to claim 1, characterized in that it contains several stops located in the respective slots symmetrically relative to the Central plane.



 

Same patents:

FIELD: metallurgy.

SUBSTANCE: press consists of upper table with first bending tools and lower table with second bending tools. Tables move one relative to another. One of the tables has two slits wherein there are inserted wedges. There is a regulating device common for both wedges and transferring both wedges. Also, the regulating device has a main control lever for simultaneous transfer of two wedges preferably to equal distance.

EFFECT: raised quality of bending.

18 cl, 9 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to press forging and may be used at crank-operated presses with composite foundation tied by studs. With force at press slide exceeding rated magnitude, reduced is rigidity of press power structure formed by press actuator, deforming tool and processed article. Note here that studs used to tie composite foundation feature central part diameter that provides reducing power structure rigidity to magnitude making 10-30% of press effective rigidity.

EFFECT: long-term inertialless protection against overloads at whatever deformation rates.

2 dwg, 1 tbl

Gasostatic extruder // 2427449

FIELD: process engineering.

SUBSTANCE: invention relates to production of processing equipment from discrete or solid materials to be subjected to high temperature and pressure, up to 2000°C and 500 MPa, respectively. Gasostatic extruder comprises power foundation and container with its face stopped by top and bottom plugs communicated with gas system. Said container houses heat-insulation hood and heater. Note here that said container accommodates accelerated-cooling system arranged in said hood and said heater elements. Said accelerated-cooling system has extra cavity made in said hood. Note also that has system feed pipe is tightly jointed with heater elements made up of carcass structural pipes provided with tangential orifices.

EFFECT: higher reliability, reduced processing cycle.

4 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to nuclear fuel powder performers. Proposed device comprises table 2 with multiple compaction female dies 4 arranged at least in line (R1, R2), top and bottom male dies to compact powder in said female dies, powder proportioner, at least one batch funnel and drive to displace proportioner along direction X. Note here that proportioner comprises slide with its housing on top wall 16 comprising appliance for connection with at least one powder feed tube 10 and appliances (19, 23, 119) to distribute powder along axes parallel with said direction X arranged on slide housing walls (18.1, 18.2) perpendicular to said direction X that feature ramp profile in plane parallel to that of displacement. Note here that distance between female dies 2 equals that between bottom sections 25 of distribution appliance teeth while said slide is arranged on table 2 to embrace every female die 4 by every bottom section 25 between two teeth during slide displacement.

EFFECT: uniform distribution of powder, shorter cycle.

29 cl, 9 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to metal forming. Proposed device comprises frame wherein lifting mechanism displaces. Said lifting mechanism is made up of two aligned tubes. One, outer, tube is provided with rack-type lifting mechanism. Another, inner, tube is provided with additional vertical displacement mechanism made up of drum. Said drum has pins arranged along its circumference. Inner tube is made up of two parts. One, top, part represents barrel with flange atop. Another, support, part has lengthwise cutouts to receive vertical displacement mechanism pins. Both said parts stay in contact via damping spring.

EFFECT: expanded operating performances.

3 dwg

FIELD: machine building.

SUBSTANCE: press consists of a bed with a first and second cross bars and poles. A working slider dividing space between the cross bars is installed in guides of the poles. A punch is positioned in first space between the first cross bar and the slider. A knuckle-joint mechanism with the first lever is located in second space between the second cross bar and the slider. The first arm of the said lever is connected with the second lever through a knee hinge. The hydraulic drive has at least one hydraulic cylinder. Movable parts of the hydraulic cylinder are connected with the second arm of the first lever by means of an additional slider and a link with a hinge. The additional slider is installed movably in additional guides parallel to the guides of the working slider. The link is arranged movably relative to the additional slider and perpendicular to its guides.

EFFECT: accumulation of kinetic energy sufficient for work piece deformation for a short time of punch contact with it.

9 cl, 5 dwg, 3 tbl

FIELD: machine building.

SUBSTANCE: knee press with hydraulic drive consists of a bed with a first and second cross bars and poles. A working slider dividing space between the cross bars is installed in guides of the poles. A punch is positioned in first space between the first cross bar and the slider. At least one knuckle-joint leverage with the first and second levers is positioned in second space between the second cross bar and the slider. The hydraulic drive has at least one hydraulic cylinder. The press is equipped with at least one additional slider travelling in additional guides perpendicular to the guides of the working slider. In the additional slider there is an orifice perpendicular to the additional guides; in the orifice there is installed a link with a hinge connecting it with an end of the first lever of the knuckle-joint leverage.

EFFECT: accumulation of kinetic energy sufficient for work piece deformation for a short time of punch contact with it.

13 cl, 8 dwg, 3 tbl

FIELD: machine building.

SUBSTANCE: knee press consists of bed with cross bars, of poles with guides, of movable parts in form of working slider and of at least one knuckle-joint leverage. The said leverage connects the first cross bar with the working slider. The first lever of the leverage connects the first cross bar with the second lever coupled with the working slider through a slider joint. The press is equipped with at least one hydraulic cylinder movable parts of which are connected with the knuckle-joint mechanism. Stationary parts are secured on the bed. The procedure for knee press forming consists in working cycles containing stages. During the said stages the movable parts of the press are accelerated to accumulate kinetic energy sufficient for deformation of a work piece, deform the work piece and are retracted. Movable parts are accelerated before beginning of work piece deformation when the first lever reaches maximal angular velocity ωmax chosen from given range.

EFFECT: reduced duration of work piece deforming stage.

6 cl, 8 dwg, 2 tbl

Thermal press // 2424906

FIELD: process engineering.

SUBSTANCE: invention relates to pressure shaping and may be used in designing small-size presses developing different shaping forces. Thermal press comprises stationary bottom plate and one or two movable plates, extrusion ram, heat carrier or coolant feeder. Top plates are rigidly jointed to bottom plate via vertical columns. Every movable plate incorporates sleeve arrange therein. Columns and sleeves have heat carrier or coolant feed channels and are made from material with shape memory and processed thermo mechanically. Note here that, in feeding heat carrier or coolant in columns and sleeves, their length and ID may be varied. Extrusion ram and sleeve inner surface features mating annular grooves and ledges to allow engagement between extrusion rod and sleeves on feeding coolant into sleeve channels.

EFFECT: higher efficiency and safety.

2 cl, 1 dwg

Thermal press // 2424906

FIELD: process engineering.

SUBSTANCE: invention relates to pressure shaping and may be used in designing small-size presses developing different shaping forces. Thermal press comprises stationary bottom plate and one or two movable plates, extrusion ram, heat carrier or coolant feeder. Top plates are rigidly jointed to bottom plate via vertical columns. Every movable plate incorporates sleeve arrange therein. Columns and sleeves have heat carrier or coolant feed channels and are made from material with shape memory and processed thermo mechanically. Note here that, in feeding heat carrier or coolant in columns and sleeves, their length and ID may be varied. Extrusion ram and sleeve inner surface features mating annular grooves and ledges to allow engagement between extrusion rod and sleeves on feeding coolant into sleeve channels.

EFFECT: higher efficiency and safety.

2 cl, 1 dwg

FIELD: metallurgy.

SUBSTANCE: press consists of upper table with first bending tools and lower table with second bending tools. Tables move one relative to another. One of the tables has two slits wherein there are inserted wedges. There is a regulating device common for both wedges and transferring both wedges. Also, the regulating device has a main control lever for simultaneous transfer of two wedges preferably to equal distance.

EFFECT: raised quality of bending.

18 cl, 9 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to metal forming and may be used for afterworking data processing Metal forming conditions are numerically analysed to obtain forming data for sections of part being formed. Magnitudes of physical property and quantitative magnitudes of physical property of aforesaid sections are processed. Elastic afterworking magnitude is calculated proceeding from aforesaid processing results. Data are processed once more and elastic afterworking is calculated for varying sections of formed part to identify region wherein elastic afterworking makes minimum, or difference incorporating elastic afterworking without aforesaid processing makes maximum. For this, proposed device is used incorporating forming analyser, elastic afterworking analyser, processor to process results, carrier of records read off by computer incorporating programme that allows identifying location of elastic afterworking origination cause.

EFFECT: reduced elastic afterworking.

77 cl, 75 dwg, 9 ex, 3 tbl

FIELD: metallurgy.

SUBSTANCE: invention refers to metal forming operations and can be implemented at various branches of industry (machine building, ship building etc) at fabrication of box and tube-like items out of sheet metal and tubes. The procedure consists in bending sheet work-piece per several passes. Lengthwise edges are alternately bent at the first pass. During the second pass the work-piece is bent from each bent lengthwise edge to the middle of the work-piece. Simultaneously there are formed specified curvature and lugs in lengthwise direction. Further, the middle part of the work piece is bent in cross direction. During successive passes lugs from one side of the work-piece to its middle are bent from edges made at the first pass. The same is made from the other end to the middle of the work-piece with increase of applied load to a maximal in the middle part of the work-piece. The punch consists of interacting upper and lower deforming units in form of a puncheon and matrix. Working surfaces of the puncheon and matrix correspond to cross and lengthwise section of item by shape. The puncheon and the matrix are made with lugs corresponding to lugs on items and with recesses. The recesses are located between the lugs and do not contact the item.

EFFECT: reduced labour input at shaping work-pieces of big thickness and reduced consumption of material.

7 cl, 1 ex, 3 dwg

Protective system // 2372552

FIELD: mechanical engineering.

SUBSTANCE: protective system is implemented in the form of labour body, transferred by known path. System contains light-emitting facility, installed from one side of travelling part with ability of lighting of area nearby part of path, light detector, installed from the opposite side of travelling part with ability of receiving from light-emitting facility of light, passed through lighted area, and processing and control means. Processing and control means are implemented with ability of receiving of information from light detectors, and so recognition of presence at least one shadowy section, located in limits of lighted area and received by means of offset shadow to light detectors obstacles, located in lighted area. Processing and control means are implemented with ability of control of travelling part depending on specified information. Lighted area is lighted so that processing and control means allows information, enough for definition of shadowy section, or each shadowy section.

EFFECT: effectiveness increase of operation, ensured by restriction of dangerous area nearby the motion path of labour body.

50 cl, 10 dwg

Forming machine // 2349404

FIELD: metallurgy.

SUBSTANCE: invention concerns metal deformation process field. Particularly it concerns forming machines and can be used while manufacturing of polyhedral products of closed form. Forming machine contains bed, cross bar, installed with ability of rotation and displacement on columns, drive, implemented in the form of cylinder, rod of which is connected with two levers, each of which is connected by means of link with column, puncheon, matrix, carriage with rollers, located parallel to cross bar with ability of displacement. Puncheon is implemented with rectangular cross-section, is pivotally installed with ability of rotation relative to work surface of bed and outfitted from both sides by axis interlocked to additional drivers.

EFFECT: improvement of large-size products and accuracy of bending angle is provided .

4 dwg

FIELD: metallurgy.

SUBSTANCE: tool holder is designed for bending tool having two surfaces of fixture and receiving groove with upper rim. A clamping case with the first clamping surface is designed for interaction with one of the surfaces of the tool fixture. A clamping strap serves for pressing the tool and is installed to perform pivot turning; this strap is equipped with the second clamping surface. The strap can be in the first position corresponding to clamping of the tool, and in the second position corresponding to fixing/removal of the tool. There is also a holding element with variety of plates parallel to each other and arranged in the same plane. Each plate of the holding element has two spring deformed sections and at least one bent part. One spring deformed section is directed up and has an end designed for entry into the receiving groove of the bending tool, and it also has the part designed for interaction with a lower rim of the receiving groove at the tool turn.

EFFECT: extended technological capabilities.

10 cl, 5 dwg

FIELD: metallurgy; deformation of metals.

SUBSTANCE: tool holder contains a clamping base with the first clamping surface intended for the interaction with one of the parallel surfaces of the tool, and a clamping pad for clamping the tool, installed so that it may be rotated on a hinge and having the second clamping surface. The said pad is designed so that it may take the first position corresponding to tool clamping, in which the parallel surfaces of the tool are clamped between the first and second clamping surfaces, and the second position corresponding to the tool installation/removal, in which its clamping surface is withdrawn from the first clamping surface. The device also contains a holding element with multiple elastically deformed plates parallel to one another and installed in the same plane. Each plate has the first end rigidly connected to a crossbar, an intermediate part, which abuts the first parallel surface of the tool in the free state, and the second end having at least the first part bent at an angle towards the tool relative to the intermediate part, and the second part bent at an angle in the opposite direction so that the said parts bent at an angle may be held elastically in the receiving groove of the tool when the said plate is in the free state; in the tool installation/removal position of the said pad, the intermediate part of the plate may be elastically deformed for the installation of the said elastically deformed plate parts bent at an angle into the receiving groove and their removal from the groove.

EFFECT: increase in efficiency; simplification of design.

5 cl, 5 dwg

FIELD: plastic working of metals, namely manufacture of parts from shapes.

SUBSTANCE: method comprises steps of applying bending loads at predetermined force or camber of blank for one or several transitions along surface area of blank by means of rotation-local deforming along curvature lines by means of pressing moving roller on extensible bearing units mounted in such a way that to provide different spacing between said bearing units depending upon curvature radius of part. Shaping is realized at minimization of contact spot of upper pressing roller and blank due to lowered diameter of roller and its curvature radius in cross direction. Method is realized by means of machine tool whose upper deforming member is in the form of mounted in rod power drive of roller. Lower deforming member of machine tool is in the form of two extensible sections mounted with possibility of engaging with upper deforming roller. Machine tool is provided with manipulators for supporting worked blank.

EFFECT: modified design of machine tool, reduced power consumption.

10 cl, 4 dwg, 1 tbl, 1 ex

Sheet bending press // 2269391

FIELD: plastic working of metals, in particular, sheet bending equipment.

SUBSTANCE: press has bed, die, punch mounted on traverse for reciprocation in guides by means of two columns, drive formed as cylinder whose stem is connected with two levers, each of said levers being connected through shackle with column. Traverse rotates relative to one of columns. Other column is equipped with retainer for attachment of rotary traverse. Press is further equipped with carriage having rollers arranged in parallel with and moving relative to traverse.

EFFECT: wider operational capabilities.

2 cl, 4 dwg

The invention relates to the field of metal forming and can be used when designing stamps for providing supplies of curvature for receiving the cylindrical surface as close as possible to the set after removal of the stamp upon the occurrence of residual plastic deformation

Sheet bending press // 2269391

FIELD: plastic working of metals, in particular, sheet bending equipment.

SUBSTANCE: press has bed, die, punch mounted on traverse for reciprocation in guides by means of two columns, drive formed as cylinder whose stem is connected with two levers, each of said levers being connected through shackle with column. Traverse rotates relative to one of columns. Other column is equipped with retainer for attachment of rotary traverse. Press is further equipped with carriage having rollers arranged in parallel with and moving relative to traverse.

EFFECT: wider operational capabilities.

2 cl, 4 dwg

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