Method of bending edge strips in sheets bent into splined tube and bending press to this end

FIELD: process engineering.

SUBSTANCE: proposed invention relates to method of bending edge strips in sheets bent into splined tube and bending press to this end. Top die is designed to match with contour being formed. Bottom die is arranged opposite top die to displace vertically. Fixed edge strip is bent in single pass at clamped sheet press frame to necessary edge shape. Note here that, at the very beginning of bending, bottom die working surface getting in contact with bottom surface of edge strip features flat fit according to Hertz forming theory.

EFFECT: rulled out formation of ''upper edges'' and their crumbling.

10 cl, 2 dwg

 

The invention relates to a method of clinching being formed in the grooved tube sheet according restrictive part of paragraph 1 of the claims and rolling press according to paragraph 5 of the claims.

When bending a flat sheet, which must be shaped slotted pipe according to known has been operating a UOE-way, edge strip of the sheet in the U-press, you don't want to mould, and in the U-press should be formed in the circular shape of the finished pipe only with a very large pressing force. So typically the first edge of the strip is bent as far as possible to a circular shape in rolling press with the help of various rolling tools, according to the conditions of manufacture of the end zone edge bands remain almost undeformed. These detectable in the finished pipe, the so-called "upper edge" should be carried out on the possibility of a small or their appearance should be avoided, since their edit is associated with high costs.

Edges of the sheet are parallel to the opposite of the slotted tube for subsequent welding of the longitudinal seam, depending on the thickness of the sheet is usually provided with a respective cutting chamfers edges of the sheet (for example, bilateral V-shaped cutting).

Known from the prior art rolling presses for the reflection of the edging strips flat sheets consist of od is wow still installed in the frame of the press and securerandom respectively formed to the radius of bending of the upper stamp and one located oppositely with the possibility of vertical movement of the lower the stamp.

Between the upper and lower stamp is edging strip is stationary in the frame of the press clamped sheet, which is due to the vertical movement of the lower punch toward the top of the stamp is curved along the desired edge path.

This kind of rolling presses are well known, for example, from DE 2641573 A1, DE 4311228 A1 or DE 2510488 C3, which solves the problem of the undeformed end zones at the bending edge strips flat sheets (education "top edges"). Have known from DE 2510488 C3 bending presses, by moving the lower stamp in a horizontal direction, before the bending process can be performed adjustment for different thickness of the sheets or received radii of curvature. Horizontal movement of the lower stamp under load, that is, in the bending process, is not provided.

A disadvantage of the known presses is that Burke at the edges of the sheet chamfer under way during bending plastically deformed, which may arise invalid understatement of the wall thickness. Under the terms of deformations, in some cases very clearly expressed, even by the subsequent welding is not possible to reliably cover these defects edges of the sheet. This causes time-consuming and means subsequent processing of the defective pipe.

Extensive studies the research on this problem has led to an understanding of these deformations in known presses arise due to the fact that the bending process begins when the application (in the form of a line), the efforts of the bottom of the stamp to the edge of the sheet, and when exceeding the limit of elasticity of steel, experiencing plastic deformation, that is, deformation of the edges of the steel sheet. This effect is enhanced by increasing the thickness and/or strength of the steel.

Thus, although on the basis of the point of application of force to the edge of the sheet are minimized undeformed end zone, but cutting chamfers edges cause unacceptable deformation.

From the condition of vertical movement of the lower punch toward the top of the stamp is obtained by the angular difference between the contour of the lower die and the outline of the leaf. The angular difference at the beginning of the pressing process is the highest and decreases towards the end, but almost never reduced to zero. In addition, the angular difference is greater, the greater the angle of bending.

In particular, in the initial phase of the process of pressing out, due to the large angular difference, crushing in the horizontal direction on the edge of the sheet, on the basis of the application (linear) efforts from the bottom of the stamp to the edge of sheet lead to high peak voltages. The risk of severe plastic deformation of the edge of the sheet is very high.

Research the Oia, in addition, it also showed that the local peak stress during bending are reduced, since the lower stamp increasingly approach the contour edging strip, following the top of the stamp, and depending on the contour of the lower stamp the contact line moves into surface contact in the sense of pressing surfaces by Hertz theory.

To minimize the formation of "top edges" according to DE 2365515 A1 was studied conducting edging strips across the top and bottom rolling rolls, respectively convex concave circumferential contours of which correspond to the radius of the bend edge zones.

Despite the significant costs of building such a two-stage working rolling device cannot, however, however, to avoid application (linear) efforts to the edge of the sheet at the beginning of morphogenesis.

Another disadvantage is that due to the ongoing deformation of edging strips can't prevent the rolling of the edges of the sheet, which causes waviness in the areas of the edges.

In addition, it is a disadvantage that the radius of the flexible edging strip is installed by the district contours of the rolling rollers. This means that when changing pipe diameters must be entered with the corresponding prefetch kolichestvennyh rollers with different circumferential paths.

From DE102004050784 B3 known method, whereby when the bending process must be minimized education "upper edge" and prevented the plastic deformation of the edges of the sheets by a continuous surface of contact during the bending process.

This is implemented through the combined movement of the lower punch, consisting of vertical movement of the lower punch, and the simultaneous rotation around the axis of rotation by means of one bearing with a spherical bearing.

Even if this method when testing could be achieved considerable results, the implementation of a single bearing with a spherical bearing is time-consuming and expensive.

The disadvantage of bearing with spherical bearing is, in addition, that it is necessary to take associated with the cost of measures to avoid contamination of the spherical bearing and minimize wear on the bottom of the stamp and spherical bearings.

Therefore the task of the invention is to provide methods buckle being formed in the slotted pipe flat sheet in a rolling press, thanks to which simply and cost-effectively, you can minimize the formation of "top" and reliably prevent plastic deformation respectively crumples prepared for welding the edges of the sheet, and the underestimation of the thickness of tenki in the area of the welded seam on the finished pipe. Another task is to create a rolling press.

This problem is solved according to the restrictive part together with the distinctive signs of paragraph 1, paragraph 5, of the claims. Primary improvements are the subject of dependent claims.

The purpose of the invention to solve this task applies a technique in which the surface contacting to the minimum and relative to the point of application of force constant distance from the edge of the sheet during the bending process is supported through coordinated horizontal and vertical movement of the lower punch.

The great advantage of this method lies in the fact that in comparison with the known from DE 102004050784 B1 rolling pressure is achieved by the minimization of education "upper edge" and prevents plastic deformation of the edges of the sheet, and these advantages are achieved at low costs by means of simple horizontal and vertical movement of the lower punch during the bending process.

In comparison with the known rolling pressure structural complexity of this rolling press is greatly reduced because the movement of the lower punch can be just the relevant standard, with the possibility Lin is logo movement of the press punches, and does not require expensive devices for protection against contamination, as a famous rolling press.

Technique management process for horizontal movement and vertical movement of the lower punch can be implemented so that movements are performed simultaneously, for example, linearly or along any curve. In addition, the process of movement can be carried out stepwise, and the horizontal and vertical movements follow each other.

In order to limit the formation of "top" to the minimum value, the point of application of force of the lower stamp edging strip, if possible, near the edges of the sheet to choose the same so that in edging strip was pressing surfaces in the sense of pressing surfaces by Hertz theory, and, therefore, avoid pressing on the line at the edge of the sheet.

Thanks to appropriate horizontal and vertical movement of the lower punch, the point of application of effort in the lower stamp is kept constantly on the edge of the strip, so that the undeformed end area of the edge of the sheet is kept at a constant and minimum value.

Surface contact is maintained during the entire bending process, so back to the beginning of bending occurring pinch horizontal on the managing and as a consequence, the local peak voltage cut chamfers the edge of the sheet can be reliably prevented and eliminated plastic deformation due to local excess voltage.

Under the terms of the kinematics of shifting the point of application of force to the lower die due to horizontal and vertical movement in the bending process, so that the circuit come into contact with the lower side edge of the strip bottom surface of the stamp must be designed so that during the entire bending process, the pressing surfaces were maintained at least through pressing by Hertz theory.

This can be realized due to the fact that the lower stamp in the area of the point of application of force at the beginning of the bending process has, for example, a flat path, which passes into a convex shape, or the entire surface of the bottom of the stamp, which comes into contact with the edge strip during bending, has a convex-curved shape.

Mainly, to create different bending radii must be entered only one corresponding lower stamp. This eliminates the time required to prepare tool change. When it saves, in addition, significant costs associated with the supply, maintenance and installation.

Other characteristics, advantages and details of the invention follow from the following description presents examples of implementation.

Show:

figure 1 - schematic diagram corresponding to the invention of the rolling press with one installed with who is the very useful for vertical and horizontal movement under load, the lower stamp, just before saibai edging strip,

figure 2 : as figure 1, however, finally in a bent state.

The figure 1 presents the principle corresponding to the invention of the rolling press 11 with one installed with possibility of vertical and horizontal movement under load, the lower stamp 3, immediately before saibai edging strip 2 sheets.

For bending edge strip 2 sheet outside of the bend zone of the edging strip still clamped in the frame 4 bending presses 11 and positioned below the upper stamp 1, Santorinian respectively performed radius flexible.

End zone 8 is folded around the edge of the strip 2 is equipped with a chamfer 7 for welding slotted pipe, molded has been operating a UOE method.

Under the end area 8 of edging strip 2 is located corresponding to the invention, placed on a support, with the possibility of vertical and horizontal movement under load, the lower stamp 3. Direction of movement of the lower stamp for the vertical direction marked by arrow 9 and the horizontal direction of the arrow 10.

According to the invention, the point P of application of force of the lower punch 3 is located in the end area 8 of edging strip 2 at a minimum distance from the edge of the sheet in order to keep possible low education where is Onaway zone.

The bottom stamp 3, according to the invention, are made so that it becomes possible continuous surface contact, at least in the sense of pressing by Hertz theory, with folded around the edge strip 2 and thereby substantially prevents deformation of the edges of the sheet.

The contour of the front surface of the lower punch 3 in the plane of contact with the edge strip 2 has a flat plot 5, rolling in the working area of the lower punch 3 in section 6, is made convex.

The process of bending a flat plot 5 working surface of the lower punch 3 flatness [on the surface] comes into contact with the lower side edge of the strip 2, and only one component area of the working surface of the lower punch 3 deals with the lower side edge of the strip 2.

During bending, in terms of kinematics, comes the relative movement of the point of application of force in the contact plane between the bottom of the stamp 3 and the edge strip 2.

As shown on figure 2, bottom stamp 3 during the process of bending moves vertically and horizontally to the final position, namely in such a way that the point P of application of force during the bending process remains at the original place in the end zone edging strip 2, but moves along the working surface of the lower punch 3 healthy lifestyles in the Institute convex area 6. The bottom stamp 3 is moved so that both the horizontal and vertical movements are carried out simultaneously, for example, linearly or movement are stepped.

The condition of continuous surface contact with the lower side edge of the strip 2, as a consequence safely avoided linear loading and resulting from this peak voltage with a plastic deformations in the end area 8 of edging strip 2 and, in particular, on the chamfer 7.

The list of items

No.Designation
1Upper stamp
2Edging strip
3The bottom stamp
4The press frame
5The flat area of the working surface
6The convex portion of the surface
7Chamfer
8End zone
9Vertical displacement is their bottom stamp
10Horizontal movement of the lower stamp
11Rolling press
PThe point of application of force

1. The way the reflection of the flat sheet being formed in the slotted tube in rolling press with one still installed in the frame of the press and Santorinian respectively formed to the contour of the flexible upper stamp and one located oppositely with possibility of vertical movement of the lower die, between which in the course of a single working step bend edging strip is stationary in the frame of the press clamped sheet to the desired edge contour, in which the process of bending the working surface of the bottom of the stamp, which comes into contact with the lower side edge of the strip, adjacent at least flatness theory pressing Hertz with providing surface contact, wherein this surface contact is maintained at the minimum and relative to the point of application of force constant distance from the edge of the sheet during the bending process through a single coordinated horizontal and vertical movement of the lower punch.

2. The method according to claim 1, featuring the the action scene, that horizontal and vertical movement takes place simultaneously.

3. The method according to claim 2, characterized in that the horizontal and vertical movement perform linearly.

4. The method according to claim 1, characterized in that the horizontal and vertical movement performed one after another step.

5. Rolling press for the reflection of the edge strips of flat sheet being formed in the slotted tube, with one still installed in the frame of the press and Santorinian respectively formed to the contour of the flexible upper stamp and one located oppositely with possibility of vertical movement of the lower die, between which the edge strip is stationary in the frame of the press clamped sheet has the capability of bending to the desired edge contour, characterized in that the lower stamp (3), at least in the plane of contact with the edge strip (2) during bending has the contour of the outer surface, providing a surface contact, and placed on a support with the ability move under load vertically (9)and horizontally (10), and the zone of displacement in the horizontal and vertical directions is at least a magnitude that about a point (P) Supplement the efforts of the lower stamp (3) is minimum and constant distance from the edge of the sheet in EMA the whole process of bending.

6. Rolling press according to claim 5, characterized in that the outer contour of the working surface of the lower stamp (3) consists of a single convex section (6).

7. Rolling press according to claim 5, characterized in that the outer contour of the working surface of the lower stamp (3) consists of one flat section (5) and one is made convex section (6).

8. Rolling press on pp.5-7, characterized in that the possibility of moving the lower punch (3) in the horizontal and vertical directions is provided by means of the punch press can be moved.

9. Rolling press on pp.5-7, characterized in that the press punches are driven hydraulically.

10. Rolling press of claim 8, characterized in that the press punches are driven hydraulically.



 

Same patents:

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EFFECT: extended technological capabilities.

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FIELD: metallurgy.

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

4 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.

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50 cl, 10 dwg

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

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.

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EFFECT: raised quality of bending.

18 cl, 9 dwg

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

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