WO2017198382A1

WO2017198382A1 - Method and device for producing a shaped part

Info

Publication number: WO2017198382A1
Application number: PCT/EP2017/057188
Authority: WO
Inventors: Benedikt Nillies; Peter Harenkamp
Original assignee: Leifeld Metal Spinning Ag
Priority date: 2016-05-18
Filing date: 2017-03-27
Publication date: 2017-11-23
Also published as: JP6768837B2; EP3246104B1; CN109475913B; JP2019514698A; EP3246104A1; US20190291159A1; CN109475913A

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.

Description

Method and device for producing a formed part

The invention relates to a method for producing a forming part from a blank, in which the blank is set in rotation and is radially fed to an outer edge of the blank at least one compression roll, which has a circumferential shaping groove, the outer edge of the blank is compressed to a thickened region, which is formed in accordance with the forming groove of the compression roller to a thickened edge contour, and the radial upsetting to an outer region of the Ronde laterally at least two axial forming rollers are switched on or assist, which cooperate in forming the edge contour, according to the preamble of claim 1.

Furthermore, the invention relates to an apparatus for producing a Umformteils from a Ronde, with a drive device for rotating driving a Ronde and with at least one compression roller, which is radially deliverable to the Ronde for compressing the outer edge of the Ronde, according to the preamble of claim. 9

It is known to compress a blank, that is to say a rotationally symmetrical sheet metal workpiece, by radially feeding an upsetting roll with a peripheral upsetting or shaping groove for forming a material accumulation. In the accumulation of material then, for example, a toothing for forming a gear or a starter ring can be formed without cutting or cut span removing.

Due to the radial delivery of the compression roller considerable radial forces are exerted on the Ronde. In order to avoid a kinking of Rondenrandes when upsetting, it is known from DE 102 1 1 135 B4 to support the Ronde by lateral support rollers immediately below the compression area. From DE 196 02 298 C2 it is also known to use the lateral support rollers as a kind of lateral abutment, which contributes to the radial shaping of the edge bead of the blank. The forming rollers can mitausformen a radially inner bottom edge of the edge contour.

When radial upsetting a Rondenrandes by means of a compression roller with circumferential mold groove occur significant loads on the compression roller. As soon as the groove bottom of the forming groove is in contact with the outer rim of the blank, material of the blank is initially displaced axially on both sides by the radial feed of the compression roll. The displaced material is then directed radially inwardly along the flanks of the compression roll with increasing radial feed and further thickened, wherein the diameter of the tube is gradually reduced. In this case, occurs along the edges of the forming groove considerable friction due to the different movement between Ronde and compression roll in the circumferential direction. It can result in a correspondingly strong friction heating, by which the microstructure of the workpiece can be affected.

In order to reduce the loads, it is known from WO 96/22847 A1 or US Pat. No. 5,878,493 A to carry out the upsetting in stages with a plurality of different compression rollers, which have different flank angles in the forming grooves. The use of a large number of different compression rollers is costly and time-consuming.

Similar methods for upsetting a sheet metal blank by means of an upsetting roll are disclosed in DE 196 35 152 A1 and EP 0 764 482 A1.

It is the object of the invention to provide a method and a device with which a forming part can be processed from a blank in a particularly efficient manner by thickening the blank rim.

The object is achieved by a method having the feature of claim 1 and a device having the features of claim 9. Preferred embodiments of the invention are specified in the respective dependent claims.

The inventive method is characterized in that the two axial forming rollers at least in an initial phase of the radial compression at the Ver thick area with an axial Frontgebungsabstand be delivered to each other, which is smaller than an axial width of the forming groove of the compression roller, wherein the thickened portion is axially back-plunged.

A basic idea of the invention is, at least in an initial phase of the radial compression of a blank, to relieve the at least one compression roller in that these side flanks of the thickened region are acted upon directly by two axial forming rollers. The axial distance of the two opposing forming rollers is adjusted so that it is at least partially smaller than an axial width of the forming groove of the compression roller. By the two axial forming rollers so the thickened area is back-ejected after exiting the forming groove of the compression roller axially to a thickness which is smaller than a width of the forming groove. As a result of this back-upsetting of the thickened region in the axial direction, upon re-entry of the back-upsided region into the compression roll, the contact surface and thus the friction between the flanks of the shaping groove and the flanks of the thickened region are reduced. As a result, the load on the compression roller, the friction wear and the friction heating in the forming zone are correspondingly reduced. This makes it possible to achieve a generally gentler forming both for the structure of the workpiece and for the compression roller itself.

A particularly good friction reduction can be achieved according to a development of the invention in that the at least two axial forming rollers are switched on or delivered immediately behind and / or in front of the compression roller. The paired forming rollers can be arranged only a few cm behind or in front of the compression roller.

A further advantageous embodiment of the invention is that the two axial forming rollers are adjusted axially to each other during the upsetting. The axial forming rollers each have an axis of rotation which is radially directed to the axis of rotation of the blank. The axial distance of the two axial forming rollers to each other is a distance which is preferably parallel to the axis of rotation of the Ronde. The axes of rotation of the axial forming rollers may also be angled relative to the radial direction, so that back-upsetting is also made possible on obliquely directed flanks of the thickened edge region of the blank. By an axial adjustment of the forming rollers to each other, the contact surface between Ronde and Forming rollers are adjusted, which changes according to the friction. In particular, towards the end of the radial compression, an axial distance of the axial forming rollers can be increased to each other, so that a final shaping takes place substantially through the forming groove of the compression roller. The forming rollers may have radially projecting shoulders, which serve as a stop or stop edge to form approximately a radial inner or underside of the edge contour.

Furthermore, it is advantageous according to an embodiment of the method according to the invention that the two axial forming rollers are radially adjusted during the upsetting. In this way, in particular, an adaptation to a gradual reduction of the diameter of the tube during upsetting can take place.

For a precise shaping of the thickened edge contour, it is advantageous according to an embodiment variant of the invention that in an end phase of the radial compression, the axial forming rollers are spaced from the thickened region and the thickened region is finally shaped to the edge contour by the at least one compression roller. In this case, the forming groove is formed in the compression roller according to the edge contour of the blank to be formed.

A particularly efficient variant of the method according to an embodiment of the invention is that in the same clamping of the blank, an outer edge with the molded, thickened edge contour is transferred to a spinning tool and a circumferential wall region is formed. The blank is clamped between the spinning tool and a counterholder. In a first step, an edge thickening is carried out, in which case the thickened region of the circular blank is subsequently transferred to the spinning lining in the same clamping operation. In this way, a cylindrical or cup-shaped workpiece with an inner contour can preferably be produced without cutting in accordance with the outer contour of the spinning tool.

It is particularly advantageous that the transfer be carried out by means of at least one compression roller. The compression roller has a multiple function. This multifunctional upset roller reduces the number of necessary pressure rollers and tools.

For efficient shaping according to a variant of the invention, it is advantageous that when folding the thickened edge contour into an external profile, In particular, a keyway or a toothing is formed, which is formed on the spinning chuck. It forms on the peripheral wall of a corresponding inner profile. In principle, other profiles and contours can be molded.

A possible compression roller is characterized in that in addition a radially projecting pressure region is provided, which is designed for pressing and / or for pressure-rolling.

The compression roller can thus fulfill a dual function. It is used for radial compression with radial force application and for transferring the radial edge region of the Ronde axially on the spinning chuck, wherein substantially axial forces are applied. The compression roller is thus formed with a pivot bearing which receives both radial and axial forces.

A preferred embodiment of the compression roller is that the compression area are arranged in an axial center portion and the pressing portion in a lateral edge portion of the roller body. The pressing region is radially projecting and has a pressing radius.

According to a variant embodiment, it is particularly advantageous for the pressing region to have a radially projecting nose with a pressing radius and an inlet and / or outlet slope in cross-section. The inlet bevel can in particular be designed so that a folding of the radially directed Ronde section is effected by an axial movement of the compression roller.

The inventive device for producing a forming part from a blank is characterized in that a compression roller is provided.

It is particularly preferred according to an embodiment of the invention, that for clamping the Ronde a spinning chuck is provided, on which an outer profiling is formed on soft an edge portion of the blank for forming a forming part with internal profiling can be folded. The spinning chuck is part of a clamping device, wherein the Ronde is axially clamped between the spinning chuck and a counter-holder. Due to the preceding thickening, sufficient material is available to fill the external profile reliably. The invention will be further described by means of preferred embodiments, which are shown schematically in the accompanying drawings. In the drawings show:

1 shows a partial cross-sectional view through a device according to the invention at the beginning of a radial compression of a blank;

Fig. 2 is a view according to FIG. 1 at the end of the radial compression of the

Ronde;

Fig. 3 is a partial cross-sectional view of the blank prior to upsetting;

4 is a partial cross-sectional view of the blank after upsetting;

Fig. 5 is a schematic side view of the device according to the invention corresponding to Fig. 2;

Fig. 6 is a partial cross-sectional view of the device according to the invention in

Transferring a Rondenrandes on a profiled spinning lining; and

Fig. 7 is a partial cross-sectional view corresponding to FIG. 6 during the final forming of a

Forming part.

According to FIG. 1, in a device 10 according to the invention for producing a formed part, a rotationally symmetrical blank 1 made of a sheet metal material is clamped axially between a spinning chuck 12 and a counterholder 20. About a rotary drive, not shown, the clamped Ronde 1 is set in rotation.

Radially from the outside, a compression roller 50 is delivered with a roller body 52 to an outer edge of the blank 1. An upsetting region 54 with a circumferential shaping groove 56 is formed on the roller main body 52 in a middle section. The outer edge of the blank 1 is received in the forming groove 56, which defines an outer contour of the blanking area to be compressed.

The roller main body 52 is attached to an upsetting roller shaft 74, which can be rotated via a radial bearing 76 and a thrust bearing arrangement 78 in a holder 80. stores. About the storage by means of radial bearings 76 and thrust bearing 78 both forming forces in the radial direction and in the axial direction can be added.

Radially opposite to the compression roller 50, a first axial forming roller 41 and a second axial forming roller 42 are provided, which are employed axially opposite to the Ronde 1 to be formed. In the forming area, the first axial forming roller 41 and the second axial forming roller 42 have an axial forming pitch which is smaller than an axial width of the forming groove 56 of the compression roller 50. The two forming rollers 41, 42 are respectively attached to a roller shaft 43 which is rotatable are stored in a first roller holder 45 and a second roller holder 46. The first roller holder 45 and the second roller holder 46 are adjustably mounted on a guide support 48. The adjustment can be made via an adjusting device, not shown, in particular actuating cylinder or a spindle drive.

By radially feeding the compression roller 50 to the rotating Ronde 1, the outer edge of the Ronde 1 is compressed. In this case, the compressed material initially applies to a groove bottom 59 and then to flanks 58 of the molding groove 56. Unlike the groove bottom 59, the flanks 58 of the forming roller 50 and the adjacent material of the blank 1 to a different direction of movement. To reduce the friction, the two axial forming rollers 41, 42 are axially delivered to the thickening Rondenrand, with a certain axial Rückstauchen, for example, about 10% of the wall thickness, the thickened portion of the round blank 1 takes place. As a result, a friction contact is at least reduced upon re-entry of the thickened area in the compression roller 50. As a result, the friction wear, a gefügeschädigende friction heating and a load of the compression roller 50 reduce significantly.

At the end of the shaping of the thickened edge contour 3 of the round blank 1, the axial forming rollers 41, 42 can be further spaced at least to an axial distance corresponding to the width of the forming groove 56, so that the thickened edge contour 3 on the blank 1 significantly by the contour of the mold groove 56th the compression roller 50 is formed. In FIGS. 3 and 4 it is illustrated that during radial compression an outer diameter of the round blank 1 decreases, at the same time a thickened edge contour 3 being formed along the outer edge.

An end phase of the shaping of the thickened edge contour 3 with the compression roller 50 and the two axial forming rollers 41, 42 is shown schematically in FIG. FIG. 5 also shows that an outer profile 14 is provided on an outer side of the spinning chuck 12. In the illustrated embodiment, the outer profile ization 14 is designed as an axial keyway.

By means of one or more compression rollers 50, the outer edge of the blank 1 with the thickened edge contour 3 can be axially transferred to the outer profile 14 of the spinning chuck 12, as shown schematically in Fig. 6. For this purpose, the upset roll 50 according to the invention is provided with the molding groove 56 with an edge-side pressing region 60 in addition to the central swaging region 54. At the pressing portion 60, a radially projecting nose 62 is provided with a pressure radius, which merges on the one hand in an inlet slope 64 and on the other hand in a discharge slope 66. Furthermore, the upset roller 50 according to the invention can also have an opposite end-pressing region 70, with which a front side of the workpiece to be formed can be processed. Alternatively or additionally, a further flow-forming roller 30 can be delivered to the periphery of the workpiece for folding.

In the illustrated embodiment, finally, a final profile 16 can be formed for the final forming of the Umformteiles 9 9 finally according to the illustration of FIG. For this purpose, the compression roller 50 can be delivered to a front side of the Umformteiles 9 with a forehead-pressing portion 70. The only schematically indicated upset roller 50 has in the end-pressing region 70 on a projecting, approximately rectangular pressing edge.

Upon completion of the final forming step, the forming member 9 is ejected from the spinning chuck 12 by means of a slidable annular ejector 90 and removed. The forming part 9 may be a clutch disk carrier for an automatic transmission. Then, to form another workpiece, a new round blank 1 can be delivered to the device 10 and clamped between the spinning chuck 12 and the counter-holder 20.

Claims

1. A method for producing a Umformteils (9) from a Ronde (1), in which the Ronde (1) is set in rotation and at an outer edge of the Ronde (1) at least one compression roller (50) is delivered radially, which has a circumferential mold groove (56),

the outer edge of the blank (1) is compressed to a thickened region, which is formed corresponding to the forming groove (56) of the compression roller (50) to a thickened edge contour (3), and

when radial upsetting to an outer region of the blank (1) laterally at least two axial forming rollers (41, 42) are connected or assisted, which cooperate in forming the opposite edge contour (3), characterized

in that the two axial forming rollers (41, 42), at least in an initial phase of radial upsetting, are delivered to the thickened region at an axial forming distance which is smaller than an axial width of the forming groove (56) of the compression roll (50), the thickened one Area is axially backpressed.

2. The method according to claim 1,

characterized,

the at least two axial forming rollers (41, 42) are switched on or off immediately behind and / or in front of the upset roller (50).

3. The method according to claim 1 or 2,

characterized, the two axial forming rollers (41, 42) are adjusted axially relative to each other during the upsetting.

4. The method according to any one of claims 1 to 3,

characterized,

that the two axial forming rollers (41, 42) are radially adjusted during the upsetting.

5. The method according to any one of claims 1 to 4,

characterized,

that in an end phase of the radial compression, the axial forming rollers (41, 42) are spaced from the thickened region and the thickened region is finally shaped by the at least one compression roller (50) to the edge contour (3).

6. The method according to any one of claims 1 to 5,

characterized,

in the same clamping of the blank (1), an outer edge with the molded-on thickened edge contour (3) is transferred to a spinning chuck (12) and a peripheral wall region (8) is formed.

7. The method according to claim 6,

characterized,

that the transfer is carried out by means of the at least one compression roller (50).

8. The method according to claim 6 or 7,

characterized,

that during thickening the thickened edge contour (3) is formed in an outer profile (14), in particular a keyway profile or a toothing, which is formed on the spinning chuck (12).

9. A device for producing a forming part from a blank (1), according to a method according to one of claims 1 to 8,

with a drive device for the rotary driving of a blank (1) and with at least one compression roller (50) with a forming groove (56) which is connected to the blank (1) for upsetting the outer edge of the blank (1) is deliverable radially to a thickened region, and

with at least two axial forming rollers (41, 42) which laterally to the Ronde

(1) are deliverable,

characterized,

that during upsetting the two axial forming rollers (41, 42) are delivered to each other at the thickened portion of the blank (1) with an axial forming distance which is smaller than an axial width of the forming groove (56) of the compression roll (50).

Device according to claim 9,

characterized,

in that for clamping the round blank (1) a spinning lining (12) is provided, on which an external profiling (14) is formed, to which an edge section of the blank (1) can be transferred to form a forming part (9) with internal profiling.