Bending press for sheet material bending

FIELD: metallurgy.

SUBSTANCE: first and second tables of press are equipped with bending tools. Also, the first table travels relative to the second table, while the second table is fixed relative to a bed. A deformed section of the second table can be deformed in the specified direction of motion. Also, at least one connecting rod is oriented in essence perpendicular to the direction of motion; one end of the rod is secured in a deformed section of the second table, while its another end is secured in the bed.

EFFECT: raised quality of bending.

15 cl, 8 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, arranged on the matrix of the lower table 12. 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 14a, 14b of the table 14, 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 22 is pressed into sheet metal F less than extreme groups. If the floppy was performed on the matrix 18, 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 missing the Ute and which has a length L, 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.

To specify the direction of movement of the tables 12, 14, when the power cylinder V1V2the effort is put for vertical movement of the sliding table 14, column bending press generally includes two cheeks 70, 71, which will be directed to the movable table 14, limiting its lateral movement, and to hold the table 12 fixed on the axis of movement of the moving table 14, and this should be done during the whole time of application of bending force to the metal sheet or package from the side of the power cylinder V1V2. Movable table 14 includes rollers which facilitate the movement on the opposite surfaces of the cheeks 70, 71 and through which the table 14 communicates with the guide structure during movement. In addition, in the present designs stationary table contains the guide rails, which are exposed on the opposite surface of the cheeks 70, 71, when in the process of bending sheet metal, the edge of the table is deformed under the action of bending efforts. These rails are made from a material obespechivaya what about the reduced friction. Usually they are made of structural steel, bronze or synthetic materials. To ensure the accuracy of the determination direction without backlash between the cheeks 70, 71 and the deformable part of the table 12, as well as to provide the greatest possible rigidity, these guide rails often create pre-strained (deformed) state by means of spring washers and provide precise geometric alignment.

However, the design based on the use of guide rails, is not fully satisfactory.

A large number of places where there is friction, and the need to align the guide rails in a pre-stressed state means that be involved in this process forces a relatively large magnitude. As a result, management deformation of the edges of the table containing the slits, is unsatisfactory, which may lead to inaccuracies hold the position of the edge in the process of bending sheet metal, especially when these slots are long. In addition, when the edge of the table with slots, after flexible returns to its original, undeformed state, you may experience vibration. To reduce the impact of this phenomenon, it is necessary to lubricate the friction surfaces of the guide rails and/or cheeks, and this in particular, due to the additional maintenance costs.

In addition, the guide rails are particularly expensive nodes and may be subject to wear and tear, which will require replacement.

Disclosure of inventions

In the present invention proposes a method of solving the above problems and improve the required functional characteristics.

Thus, in accordance with the present invention offers a bending press, designed to be flexible, at least one sheet metal and comprising a fixed frame, a first table, which has the side equipped with the first bending tools, and the second table, which has the side facing to the specified side of the first table and equipped with a second bending tools, and the first table is configured to move relative to the second table in the direction of ensuring the application of bending force to the metal sheet placed between the first and second bending tools, while the second table is fixed relative to frame, and a deformable portion of the second table has the possibility of deformation in the direction of movement, thus bending press includes at least one connecting rod which is oriented essentially perpend is its direction, and one end of which is fixed to the deformable portion of the second table, and the other end fixed in the frame.

Using the present invention eliminates the effects of high friction and hysteresis while providing a forced deformation of the table, which has a deformable part (obtained by means of the slots or other system that makes it possible deformation of at least one part of the stationary table, so that the curvature of the edge of the table had to be "in parallel" with the curvature of the edge, facing him sliding table)and provides high accuracy at a low cost. In addition, it eliminates the need for maintenance associated with the reduction of friction by applying lubricants that takes place in existing structures. Connecting rods used in the present invention, such maintenance is not required.

According to a preferred variant, the first and second table are, respectively, the upper and lower table, and the direction is vertical.

It is desirable that a bending press contained at least one pair of connecting rods. In this design both connecting rod are located essentially in the plane direction.

It is preferable that a bending press contained at least one guide element to ensure the acceptable displacement of the first table in the specified direction. In the embodiment, two connecting rods both connecting rod couples are in the area, which is defined as part of the specified guide element serving area of the second table.

It is desirable that corresponds to the invention a bending press contained two pairs of connecting rods transversely spaced from each other in the specified direction.

According to a preferred variant of the bed contains two cheeks, essentially parallel to the direction of motion, which are separated from each other in the direction transverse to the direction of motion.

In the embodiment, each connecting rod has a cylindrical shape and contains along its length sections of different diameters. With this geometry it is possible to provide that connecting rod contained the Central section of the small diameter and the ends of large diameter.

Preferably, the ends of large diameter were inserted, respectively, into a portion of the frame and a deformable portion of the second table.

Preferably, a segment of the Central section of the connecting rod small diameter was inserted with a gap in one of the elements that formed the specified part of the frame and a deformable part of the second table.

According to one aspect of the invention, it is preferable that in a state of the AI rest axis of each connecting rod was a straight line, and rod was able to bend so that its end can be displaced relative to the specified rectilinear axis by the amount d of at least 0.5% of the length of the rod.

According to another aspect of the invention, it is preferable that the second table contained at least one slot, and a deformable portion located between the slot and the top side of the second table.

Preferably, in order to maximize the stiffness of each connecting rod is made of a material with a high value of the modulus of elasticity, i.e. greater than 200 MPa.

Preferably, each connecting rod is made of steel from the family manganese-silicon steel, chrome, chrome-vanadium, chromomagnetic or silicon-molybdenum steel. Naturally, you may use any other suitable material, designed to provide reasonable flexibility without the risk of fracture and plastic deformation.

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, the cat is which are located respectively on each side of the Central plane of R R and go from opposite sides of the lower table;

figa and 2B depict the corresponding variant of the invention the implementation of the connecting rod;

figure 3 is a front view corresponding to the invention, bending presses, parallel side rails have two matching pairs of connecting rods;

4 in an enlarged view depicts a fragment of the bending press 3 with one of the two pairs of connecting rods;

figure 5 is a side view of figure 4;

6 is a perspective projection depicts the edge guide to the cheek and a fragment of the bottom of the table, while these elements are connected to each other by a pair of connecting rods;

7 in cross-section depicts the edge guide to the cheek and a fragment of the bottom of the table with a pair of connecting rods with no load on the lower table;

Fig identical to Fig.7, but depicts the situation when the lower table is under full load.

The implementation of the invention

In the following description it is believed that the lower table 12 is stationary table that has the slots 24, 26, ideally located, respectively symmetrically relative to the Central plane R R bending presses, while the upper table 14 is movable table configured to move under the action of the power cylinder V1V2. CDF is f, the power cylinder V1V2there are the directing means (not shown) for setting the vertical direction of movement of the upper table 14 along the axis of movement D of the upper table 14 and the deformable portion 112 of the lower table 12.

As already mentioned in connection with figure 1, under the action of the pistons of the power cylinders of the V1and V2located at opposite edges of the sliding table 14, the upper portion 112 of the fixed table 12, i.e. the part of the table 12, located between the slots 24 and 26 and the top side 12A of the lower table 12, makes moving forward in the movement D.

The present invention provides a technical solution, which accompanied the movement of the deformable portion 112 of the lower table 12, or forced displacement of the specified portion so that movement of the deformable portion 112 during the application of bending forces and after it happened within a vertical prism, comprising a table 12, without any lateral movement of the specified deformable portion 112. The expression of the transverse motion of the deformable portion 112 should be understood that any movement that does not fit into the space bounded by two parallel axes X1X2and X3X4that shown in figure 5 and correspond to the coordinates of the opposite is Rana the bottom of table 12.

On figa and 2B shows a variant implementation of the linking rod 100, corresponding to the present invention. Connecting rod 100 is elongated along the axis's X and contains three essentially cylindrical plot: two end of section 100a and 100b and a Central section 100c between two specified end stations 110A and 110b. The ends 110A and 110b have a larger diameter than the diameter of the Central section 100C, so the ability to the elastic curve at the Central section 100C higher. Thus, the connecting rod 100, pinned one of its ends 100a or 100b in a deformable upper portion 112 of the lower table 12, and the other end 100a or 100b in the frame bending presses, capable due to elastic bending of the Central section 100c to accompany the movement or deformation of the upper part 112 of the lower table 12, when the metal sheet F is applied bending force.

It should be noted that the diameter of the end 100b of connecting rod 100 is greater than the diameter of the end 100a.

Figure 3 two pairs of connecting rods 100, 101 are attached to the lower table 12. These two pairs of connecting rods 100, 101 are located near opposite edges of the bottom of the table 12 at some distance from each other. Each connecting rod 100 or 101 is fixed by one of its ends 100a or 100b in the deformable portion 112 is inego table 12, the other end 100a or 100b in one of the two cheeks 70, 71 frame bending press. Each of the side rails of the cheeks 70, 71 is held vertically and falls below one of the respective power cylinders V1V2. Cheeks 70, 71 are perpendicular to the plane of the bottom of the table 12 and is essentially parallel to the direction of movement D.

From figure 4-6 shows that the two linking rod 100, 101 of one pair are in the plane of the cheeks 70, 71 and, therefore, perpendicular to the face of the lower table 12.

The ends 100b linking rod 100, 101 fixed to the deformable portion 112 table 12 standard mechanical means. In this embodiment, two nuts 200, 201 is screwed on the opposite sides of the end portion 100b and are drawn to opposite edges of the table 12, thereby rigidly locking the tail section 100b in table 12. You can also ensure that the holes deformable part 112, in which are inserted the ends 100b linking rod 100, 101, was threaded on the ends 100b also tapped to the ends 100b can be screwed into these threaded holes.

In the example chosen to illustrate the present invention, the length of the ends 100b linking rod 100, 101 equal to the thickness of the lower table 12. The other end 100a of each of the connecting rods 100, 101 are inserted into the socket 300, the diameter of which is CSO essentially equal to the diameter of the end 100a. End 100a linking rod 100, 101 in this embodiment is fixed in cheek 70, 71 by means of a pin 50. In the cheeks 70, 71 and ends 100a connecting rods 100, 101 are respective transverse holes are essentially of the same diameter; however, each of these holes passes through the cheek 70 or 71 and through the end 100a of the corresponding linking rod 100, 101. When the end 100a is inserted into place in the socket 300 cheeks 70, 71, hole end 100a is combined with a hole cheeks 70, 71, so that the pin 50 can pass through the cheek 70 or 71 and through the end 100a linking rod 100, 101 to lock the linking rod 100, 101 in cheek 70, 71.

On your end 100b linking rod 100, 101 are fixed at several points, which ensures a special rigidity of its fastening - specifically, in this embodiment, the rod is fixed by two nuts 200, 201, which is depicted in the attached figures, while at the end 100a linking rod 100, 101 are fixed only at one point. The ends 100a, 100b are fixed to the table 12, and the cheek 70, 71 fixed way or disassembly. In the case of non-separable fastening the fixation of the ends 100a, 100b, respectively, in table 12 and cheek 70, 71 can be made by welding or gluing, while for demountable fastening the ends can be fixed by screws, dowels or the m any other method of mechanical fastening.

However, due to the fact that the Central section 100c linking rod 100, 101 has a diameter less than the diameter of the ends 100a, 100b, and the socket 300 has a diameter substantially larger diameter end 100a, the Central section 100C has mobility and can make the bend inside the socket 300. Thus, even when the maximum bending of the Central section 100C linking rod 100, 101, the rod 100, 101 does not touch the edges of the holes at the entrance to the socket 300. It should be noted that the linking rod 100, 101 has a very high rigidity against the tension/compression along its longitudinal axis H X.

In the embodiment, in which a pair of connecting rods 100, 101, enshrined in cheek 70, 71 and the deformable portion 112 table 12, the ends 100a, 100b these rods form the four vertices of a deformable parallelogram between the cheek 70 or 71 and a deformable part 112 table 12. Naturally, due to the use of a pair of connecting rods 100, 101, instead of only one linking rod 100, 101, control the direction of movement of the deformable portion 112 of the table is significantly improved. In addition, the present invention does not limit the number of pairs used connecting rods in each set may be provided more than two pairs of connecting rods 100, 101.

7 and 8 shows a pair of connecting rods 100, 101, ACC is respectively, when there is no load on the bottom of the table 12, and when the table 12 is under full load. In the initial state, when there is no load, the Central section 100C linking rod 100, 101 has a bend, so between the end 100b and the end 100a of the rod has a vertical offset of a d - end 100b is located above the end 100a. The offset d between the ends 100a and 100b linking rod 100, 101 creates a pre-deformation of the rod 100, 101. When a force is applied F0for flexible sheet metal F or package specified initial pre-strain is reduced to zero (at half the displacement of the bottom of the table), then the lower table 12 is shifted even more strongly on the distance d in the direction D, so that the final deformation is equal in magnitude but opposite in sign to the pre-strain, which was present initially (at rest) in the linking rod 100, 101. The usefulness of the initial displacement d between the ends 100a and 100b in the direction D (i.e., the end 100b attached to the deformable portion 112 of the lower table 12, is located above a distance d than the end 100A enshrined in cheek 70, 71), is that the linking rod 100, 101 allows you to bend at a greater angle when the deformable portion 112 table 12 performs motion. This makes it possible to focus on iunie deformable portion 112 of the lower table 12 at a greater interval. In the embodiment shown in Fig.7-8, the stroke is 2d. If you set the preliminary deformation of the linking rod 100, 101 so that its end 100b was removed at the maximum distance (within elastic deformation of the rod) relative to the end 100A in the direction D, then the movement of the connecting rod will be copied at a distance equal to twice the value of the maximum displacement, so that the deformable portion 112 will have the opportunity ideal bending and deformation of the edges 12A of the table 12 will really be done parallel to the bottom side of 14C between the edges 14a and 14b of the table 14. For example, if the starting offset (in the direction opposite to the movement D) between the two ends 100A, 100b is 1 mm, then the length of the stroke, during which the connecting rod directs the movement of the deformable portion 112 of the lower table 12, can be equal to at least 2 mm, for Example, the linking rod 100, 101 has a length of 150 mm with an average diameter (average value of the diameters of the various sections 100A, 100b and 100C linking rod 100, 101), equal to 14 mm In this geometry the vertical offset between the two ends 100A and 100b linking rod 100, 101 may lie in the range 0-1,5 mm.

1. A bending press for bending at least one metal sheet, containing odijoo bed, the first table, which has the side equipped with the first bending tools, and the second table, which has the side facing to the specified side of the first table and equipped with a second bending tools, and the first table is configured to move relative to the second table in the direction of ensuring the application of bending force to the metal sheet placed between the first and second bending tools, while the second table is fixed relative to the frame, and a deformable portion of the second table has the possibility of deformation in the direction of movement, thus bending press includes at least one connecting rod which is oriented essentially perpendicular to the direction of movement, one end of which is fixed to the deformable portion of the second table, and the other end fixed in the frame.

2. A bending press according to claim 1, characterized in that the first and second table are, respectively, the upper and lower table, and the direction is vertical.

3. A bending press according to claim 1, characterized in that it contains at least one pair of connecting rods.

4. A bending press according to claim 3, characterized in that the two connecting rod are located essentially in the plane direction.

. A bending press according to claim 1, characterized in that it contains at least one guide element to provide a given displacement of the first table in the specified direction.

6. A bending press according to claim 5, characterized in that it contains at least one pair of connecting rods, both connecting rod couples are specified in the zone, which is defined as part of the specified guide element serving area of the second table.

7. A bending press according to claim 1, characterized in that it contains two pairs of connecting rods transversely spaced from each other in the specified direction.

8. A bending press according to claim 7, characterized in that the frame contains two cheeks, essentially parallel to the direction of motion, which are separated from each other in the direction transverse to the direction of motion.

9. A bending press according to claim 1, characterized in that each connecting rod has a cylindrical shape and contains along its length sections of different diameter.

10. A bending press according to claim 9, characterized in that the connecting rod has a Central section of a small diameter and the ends of large diameter.

11. A bending press according to claim 10, characterized in that the ends of large diameter are inserted respectively in the part of the frame and a deformable portion of the second table.

2. A bending press according to claim 11, characterized in that segment of the Central section of the connecting rod of small diameter is inserted with a gap in one of the elements that formed the specified part of the frame and a deformable part of the second table.

13. A bending press according to claim 1, characterized in that at rest, the axis of each connecting rod is a straight line, and the rod is able to bend so that its end can be displaced relative to the specified rectilinear axis by an amount at least 0.5% of the length of the rod.

14. A bending press according to claim 1, wherein the second table includes at least one slot, and the specified deformable portion is located between the slot and the top side of the second table.

15. A bending press according to claim 1, characterized in that each connecting rod is made from a material with a high value of the modulus of elasticity greater than 200 MPa.



 

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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

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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