Method and device for fabricating a toothing at a three-dimensional body produced by forming and fine blanking

Abstract

The invention relates to a method and a tool for fabricating a toothing at a three-dimensional body produced by forming and fine blanking, especially an attachment for car seat components or the like produced out of a flat strip, wherein the flat strip by forming and fine blanking in a tool is formed into a pot-shaped body with placed in the base of the body inner forms like impressions and/or projections and/or indentations and/or recesses and/or sinks and/or holes and/or pivots and a substantially evenly curved edge and afterwards into the edge is fabricated a toothing radially extending to the inner side of the body.

Description

EMBODIMENT

In the following the invention shall be explained more detailed at the example of an embodiment.

It is shown in

FIG. 1: a sectional view through a common three-dimensional hinge attachment with inner toothing, which was produced according to the method of this invention,

FIG. 2: a principal diagram of the device according to this invention,

FIG. 3: a schematic diagram of the fine blanking at the beginning of the method according to this invention,

FIG. 4: a schematic diagram of the fine blanking at the end of the method according to this invention.

By means of the method according to this invention shall be produced a three-dimensional pot-shaped body 1 (hinge attachment) with an inner toothing 2.

FIG. 2 shows the principal construction of the device 3 according to this invention by means of which the method according to this invention is executed.

In the finished state the pot-shaped body 1 has a circular edge 4, a central hole 5 for inserting the hinge axle A, a circular embossed recess 6 adjacent to edge 4 and ejected impressions 7 in the base 8 of body 1, which serve for fixing to the frame of the back of the seat, for example by welding.

The device 3 according to this invention—as shown in FIG. 2—has a base plate 9, on which the pot-shaped body 1 is fixed. The pot-shaped body 1 is hold by a distance plate 10 the height of which corresponds to the height of the body 1. On the circular edge 4 of body 1 lies a pressure pad 11, which firmly fixes body 1 between base plate 9 and pressure pad 11.

The fine blanking die 12 is part of a fine blanking tool not shown. The working direction of the fine blanking die 12 is denoted with AR.

In the end portion 13 of the fine blanking die 12, that extends towards body 1, is provided a hollow space 14, in which is placed a sliding pilot die 15, the axis C of which lies on the axis B of the fine blanking die 12. This pilot die 15 by a compression spring 18, which is placed between the bottom end 16 of the hollow space 14 and the end 17 of the pilot die 15, extending to the direction away from body 1, is pushed to a certain amount X out of the hollow space 14.

As soon as the fine blanking die 12 controlled by the pressure pad 11 moves in working direction AR, the fine blanking die 12 starts to cut a toothing 19 at the inner side IS of the circular edge 4 and at its front side shifts a burr 20 on the cutting surface 21 along the inner side IS of the edge 4 (see FIG. 3). The compression spring 18 simultaneously pushes the pilot die 15 to the amount X out of the hollow space 14 of the fine blanking die 12, so that the pilot die 15 contacts the base 8 of body 1 and between the cutting surface 21 on the inner side IS in alignment with indentation 6 creates a groove 22. The burr 20 with the descending movement of the fine blanking die 12 purposefully shifts in this groove 22 downwards into the indentation 6. In the case that in place of a fine blanking die 12 is used a shaving die not shown here, the groove 22 serves for the purposeful diversion or deflection of possibly developing shaving chips into the indentation 6 and simultaneously prevents shaving chips from getting outside through hole 5.

FIG. 4 shows the final position of the fine blanking die 12, in which the fine blanking die 12 has contacted the base 8 and has pressed the burr 20 into the indentation 6. The pilot die 15 in this position is pushed back into the hollow space 14 against the compression spring 18. During the process of creating the toothing in edge 4 of the pot-shaped body 1 is applied an at least two-staged shaving operation, wherein a shaving die forms the toothing 19 at the inner side IS. The developing shaving chips through groove 22 are led into the indentation and pressed into it by the shaving die as soon as the latter contacts the base 8 of the pot-shaped body 1.

LIST OF DRAWING REFERENCES

• pot-shaped body (hinge attachment) 1
• inner toothing 2
• device 3
• edge of 14
• hole in 15
• recess in 16
• impression 7
• base of 18
• base plate of 39
• distance plate of 310
• pressure pad of 311
• fine blanking die 12
• end of 1213
• hollow space 14
• pilot die 15
• bottom end of 1416
• opposite end of 1217
• compression spring 18
• toothing 19
• burr 20
• cutting surface 21
• groove 22
• axis of 1 A
• working direction of 12 AR
• axis of 12 B
• axis of 15 C
• amount to which 15 is pushed out of 14 X
• inner side of 4 Is

Claims

1-8. (canceled)

9. A method for fabricating a toothing at a three-dimensional body, comprising: forming and fine blanking a pot-shaped body out of a flat strip in a tool, said pot-shaped body having inner forms in a base thereof and including a substantially evenly curved edge; andfabricating a toothing in the edge radially extending to an inner side of the body, the toothing in the edge of the pot-shaped body being exclusively produced by cutting and/or shaving with a fine blanking die and/or a shaving device, and a burr and/or shaving chips developing during the cutting and/or shaving being pressed into an indentation allocated to the toothing.

10. A method according to claim 9, wherein said three-dimensional body is an attachment for a car seat.

11. A method according to claim 9, wherein said inner forms include at least one of impressions, projections, indentations, recesses, sinks, holes and pivots.

12. A method according to claim 9, wherein, before the cutting and/or shaving, the base of the pot-shaped body is fixed by advancement of a fine blanking die and/or shaving device pilot die, and the burr and/or the shaving chips are led and pressed into the indentation with defined location as being centrally delimited by the fine blanking die or shaving device pilot die.

13. A method according to claim 9, wherein the shaving is executed as an at least two-staged operation.

14. A method according to claim 9, wherein the fine blanking is executed in combination with the shaving.

15. A device for the fabrication of a toothing at a three-dimensional pot-shaped body produced by forming and fine blanking, comprising: a tool for forming teeth into a substantially evenly curved edge of a pot-shaped body having inner forms in a base thereof, the teeth of the toothing radially extending to an inner side of the pot-shaped body, the three-dimensional body being fixed between a base plate and a pressure pad, the tool including a die for fine blanking or shaving in which is provided a hollow space;a sliding pilot die being placed within said hollow space, movable in a working direction of the tool and engageable with the base of the pot-shaped body, said pilot die being biased by a spring and coupled to said die such that the pilot die, during a descending movement thereof, advances the die and a groove is created between the cut or shaved surface of the inner toothing and the pilot die for leading the fine blanking burr or shaving chips into the recess of the body, wherein the die, when reaching a lowest position thereof, fixes and presses the burr or the chips into the recess.

16. A device according to claim 15, wherein said three-dimensional pot-shaped body is an attachment for a car seat.

17. A method according to claim 15, wherein said inner forms include at least one of impressions, projections, indentations, recesses, sinks, holes and pivots.

18. A device according to claim 15, wherein the spring is a compression spring.

19. A device according to claim 15, wherein a distance plate having a height which corresponds to a height of the pot-shaped body is placed between the base plate and pressure pad.

20. A device according to claim 15, wherein the die and the pilot die have a common axis.