METHOD AND DEVICE FOR PRODUCING A FORMED PART

Abstract

The invention relates to a method and a device for producing a shaped part from a circular blank, wherein the circular blank is rotated and at least one compression roller is radially applied to an outer edge of the circular blank, said compression roller having a circumferential shaping groove. The outer edge of the circular blank is compressed to form a thickened region, which is shaped according to the shaping groove of the compression roller to form a thickened edge contour. With the radial compression, at least two axial shaped rollers are applied to an outer region of the circular blank, which cooperate when shaping the edge contour. According to the invention, at least in a starting phase of the radial compression, the two axial shaped rollers are applied to the thickened region at an axial shaping distance to one another, which distance is smaller than an axial width of the shaping groove of the compression roller, wherein the thickened region is axially compressed back.

Claims

1. A method for producing a formed part from a circular blank, in which the circular blank is set into rotation and at least one upsetting roller, which has a circumferential forming groove, is fed radially to an outer edge of the circular blank, the outer edge of the circular blank is upset to a thickened region which is formed to a thickened edge contour according to the forming groove of the upsetting roller, and during radial upsetting at least two axial forming rollers, which cooperate during the forming of the opposite edge contour, are applied or fed laterally to an outer region of the circular blank, wherein at least in a starting phase of radial upsetting the two axial forming rollers are fed to the thickened region with an axial forming distance to each other which is smaller than an axial width of the forming groove of the upsetting roller, wherein the thickened region is back-upset axially.

2. The method according to claim 1, wherein the at least two axial forming rollers are applied or fed directly behind and/or before the upsetting roller.

3. The method according to claim 1, wherein the two axial forming rollers are adjusted axially to each other during upsetting.

4. The method according to claim 1, wherein the two axial forming rollers are adjusted radially during upsetting.

5. The method according to claim 1, wherein in a final phase of radial upsetting the axial forming rollers are spaced from the thickened region and the thickened region is finish-formed to the edge contour by the at least one upsetting roller.

6. The method according to claim 1, wherein in the same clamping of the circular blank an outer edge with the formed-on thickened edge contour is folded over onto a spinning chuck and a circumferential wall region is formed.

7. The method according to claim 6, wherein the folding-over is carried out by means of the at least one upsetting roller.

8. The method according to claim 6, wherein during folding-over the thickened edge contour is formed into an external profiling, in particular a splined groove profile or a toothing, which is designed on the spinning chuck.

9. A device for producing a formed part from a circular blank pursuant to the method according to claim 1, with a drive means for driving a circular blank in a rotating manner and with at least one upsetting roller having a forming groove, which can be fed radially to the circular blank in order to upset the outer edge of the circular blank to a thickened region, and with at least two axial forming rollers which can be fed laterally to the circular blank wherein for the clamping of the circular blank a spinning chuck is provided, on which an external profiling is designed, onto which an edge section of the circular blank can be folded over to create a formed part with internal profiling, wherein the external profiling is a splined groove profile or a toothing, in that during radial feeding and upsetting by means of the at least one upsetting roller the two axial forming rollers are fed to the thickened region of the circular blank with an axial forming distance to each other which is smaller than an axial width of the forming groove of the upsetting roller, and in that on the upsetting roller a spinning region with a radially protruding nose having a spinning radius and a run-in slope and a run-out slope is provided for folding over the radially directed circular blank section of the circular blank through an axial movement.

10. (canceled)

Description

[0026] The invention is described further hereinafter by way of preferred embodiments illustrated schematically in the accompanying drawings, wherein show:

[0027] FIG. 1 a partial cross-sectional view of a device according to the invention at the beginning of a radial upsetting of a circular blank;

[0028] FIG. 2 an illustration according to FIG. 1 at the end of the radial upsetting of the circular blank;

[0029] FIG. 3 a partial cross-sectional view of the circular blank before upsetting;

[0030] FIG. 4 a partial cross-sectional view of the circular blank after upsetting;

[0031] FIG. 5 a schematic side view of the device according to the invention corresponding to FIG. 2;

[0032] FIG. 6 a partial cross-sectional view of the device according to the invention during folding-over of a circular blank edge onto a profiled spinning chuck; and

[0033] FIG. 7 a partial cross-sectional view corresponding to FIG. 6 during finish-forming of a formed part.

[0034] According to FIG. 1, in a device 10 pursuant to the invention for producing a formed part a rotationally symmetrical circular blank 1 of sheet material is clamped axially by being centered between a spinning chuck 12 and a counter-holder 20. By way of a non-depicted rotary drive the clamped circular blank 1 is set into rotation.

[0035] From the radial outward direction an upsetting roller 50 with a roller base body 52 is fed to an outer edge of the circular blank 1. On the roller base body 52 in a central section thereof an upsetting region 54 with a circumferential forming groove 56 is designed. The outer edge of the circular blank 1 is received in the forming groove 56 which predetermines an external contour of the circular blank region to be upset.

[0036] The roller base body 52 is mounted on an upsetting roller shaft 74 which is rotatably supported via a radial bearing 76 and an axial bearing arrangement 78 in a holder 80. The support by means of radial bearing 76 and axial bearing 78 renders it possible to absorb forming forces both in the radial direction and in the axial direction.

[0037] Radially opposite the upsetting roller 50 a first axial forming roller 41 and a second axial forming roller 42 are provided which are applied on the opposite side axially to the circular blank 1 to be formed. In the forming region the first axial forming roller 41 and the second axial forming roller 42 have an axial forming distance that is smaller than an axial width of the forming groove 56 of the upsetting roller 50. The two forming rollers 41, 42 are each mounted on a roller shaft 43 which are rotatably supported in a first roller support 45 and a second roller support 46 respectively. The first roller support 45 and the second roller support 46 are supported in an adjustable manner on a guide carrier 48. Adjustment can be carried out via a non-depicted adjustment means, more particularly a positioning cylinder or a spindle drive.

[0038] By radially feeding the upsetting roller 50 to the rotating circular blank 1 the outer edge of the circular blank 1 is upset. In doing so, the upset material initially accumulates on a groove base 59 and then on flanks 58 of the forming groove 56. In contrast to the groove base 59 the flanks 58 of the forming roller 50 and the accumulated material of the circular blank 1 have a different direction of movement. To reduce friction the two axial forming rollers 41, 42 are fed axially to the thickening circular blank edge, whereby a certain axial back-upsetting, e.g. amounting to approximately 10% of the wall thickness, of the thickened region of the circular blank 1 takes place. Through this, a frictional contact is at least reduced when the thickened region re-renters the upsetting roller 50. As a result, frictional wear, a structure-damaging frictional heat-up and a load of the upsetting roller 50 are reduced considerably.

[0039] At the end of forming the thickened edge contour 3 of the circular blank 1 the axial forming rollers 41, 42 can be spaced further at least to an axial distance that corresponds to the width of the forming groove 56 so that the thickened edge contour 3 on the circular blank 1 is principally formed by the contour of the forming groove 56 of the upsetting roller 50.

[0040] FIGS. 3 and 4 illustrate that during radial upsetting an external diameter of the circular blank 1 is reduced, and at the same time a thickened edge contour 3 is created along the outer edge.

[0041] A final phase of forming the thickened edge contour 3 with the upsetting roller 50 and the two axial forming rollers 41, 42 is shown schematically in FIG. 5. It can also be taken from FIG. 5 that on an outer side of the spinning chuck 12 an external profiling 14 is provided. In the illustrated embodiment the external profiling 14 is realized as an axial splined groove profile.

[0042] By means of one or several upsetting rollers 50 the outer edge of the circular blank 1 with the thickened edge contour 3 can be folded over axially onto the external profiling 14 of the spinning chuck 12, as illustrated schematically in FIG. 6. For this purpose, the upsetting roller 50 according to the invention is provided with an edge-sided spinning region 60 in addition to the central upsetting region 54 with the forming groove 56. In the spinning region 60 a radially protruding nose 62 with a spinning radius is provided which merges on the one hand into a run-in slope 64 and on the other hand into a run-out slope 66. Furthermore, the upsetting roller 50 according to the invention can also have an opposite frontal spinning region 70, with which a front side of the workpiece to be formed can be processed. Alternatively or additionally, for folding-over a further flow-forming roller 30 can be fed to the circumference of the workpiece.

[0043] In the depicted embodiment according to the illustration of FIG. 7, for the finish-forming of the formed part 9 a frontal profile 16 can finally be formed. To this end, the upsetting roller 50 can be fed with a frontal spinning region 70 to a front side of the formed part 9. In the frontal spinning region 70 the upsetting roller 50, depicted schematically only, has a protruding spinning ridge of approximately rectangular shape.

[0044] On completion of the final forming step the formed part 9 is ejected and removed from the spinning chuck 12 by means of a displaceable, annular ejecting means 90. The formed part 9 can be a clutch plate carrier for automatic transmission. Subsequently, for the forming of a further workpiece a new circular blank 1 can be fed to the device 10 and clamped between the spinning chuck 12 and the counter-holder 20.