A - Human Necessities – 61 – C
Patent
A - Human Necessities
61
C
83/14
A61C 3/00 (2006.01) B21H 5/02 (2006.01)
Patent
CA 1173279
ABSTRACT OF THE DISCLOSURE A tool and method for pressure forming teeth on the periphery of a cylindrical work piece wherein each of the teeth has a predetermined crown formed thereon. The tool includes a body having a leading edge and a trailing edge. The leading edge. of the tool body has an undercut surface thereon supportingly receiving a tooth crowning section having the side edges thereof shaped outwardly of the undercut surface on the tool to shape transversely formed insert teeth to form a predetermined crown on the teeth of the part being formed by the tool. In one method, pre- formed teeth on a rack insert. are formed by a grinding tool following a straight path; the insert for forming the crown on the rolled part then is held on a grinding fixture base by a center shim so as to form a concave surface on the underside of the insert by exceeding the modulus of elastici- ty of the rack insert material wherein, following removal of the insert from the grinding fixture base, the teeth sur- faces on the rack insert are shaped in a convex form to produce crowning of spline teeth on a cylindrical member that is pressure formed by the insert.
399950
Ex-Cell-O Corporation
Macrae & Co.
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