B - Operations – Transporting – 23 – D
Patent
B - Operations, Transporting
23
D
76/3
B23D 3/00 (2006.01) B21J 5/12 (2006.01) B21K 5/20 (2006.01)
Patent
CA 1086100
PROCESS AND APPARATUS FOR MANUFACTURING TRIMMING DIES ABSTRACT OF THE DISCLOSURE A process and apparatus for manufacturing trimming dies having a conical polygonal aperture and for use in a nut-trimming press equipped with a cup-shaped fixture for holding the die to calibrate the width over flats of hexagonal nuts. The invention is characterized in that a blank to form a trimming die is produced with an external diameter corresponding with an internal diameter of a cup-shaped holding fixture. The blank has a height corresponding to the height of the finished die. The blank also has a cylindrical bore. A polygonal bore is made in the cylindrical bore of the blank by cold deformation of the internal diameter by means of a polygonal pressure punch inserted into the internal bore in a confined manner while retaining the external diameter size of the blank.
313488
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
Sack & Kiesselbach
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