B - Operations – Transporting – 21 – C
Patent
B - Operations, Transporting
21
C
B21C 23/01 (2006.01) B21C 23/14 (2006.01) B21D 19/14 (2006.01) B21D 53/28 (2006.01) B21D 53/88 (2006.01)
Patent
CA 2569192
The invention relates to a method for the reinforcement of a wall region of a three-dimensional attachment for high torque loads, wherein out of a flat strip is cut out a plate with a substantially evenly curved outer contour and the plate afterwards is formed and fine blanked into a pot-shaped body with projections and/or impressions and/or indentations and/or recesses and/or sinks and/or holes and/or pivots by means of a forming and fine blanking tool including die, counter-die, die plate, V-shaped projection and pressure plate, whereby at the body is formed a circular edge for a toothing. The invention has the object to improve a method of the kind discussed above in a way, that provides hinge attachments with a much higher safety with regard to fracture of the wall region between the edge with an inner toothing and the pot--shaped body of the hinge attachment in a cost-effective way. This object is solved in that the thickness (s) of the wall region (10) between the edge (8) and the pot-shaped body (3) of the attachment by a purposeful material shifting with at least a two-staged cold-extrusion process in respectively opposite flow directions (C, D) angular to the die movement (SM) is reinforced in a way, that the purposeful material shifting in the wall region (10) approximately equalizes the runoff of material caused by the forming.
Feintool Intellectual Property Ag
Riches Mckenzie & Herbert Llp
LandOfFree
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