Method for making fasteners
AssigneeUnion Carbide Corporation
InventorJaak S. Van den Sype
Life of this patent
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Abstract
A method for making a fastener having a head and a shank from a slug consisting essentially of an AISI 200 or 300 series stainless steel having an Md.sub.30 temperature in the range of about minus 50.degree. C. to about 50.degree. C. comprising the following steps: (a) cooling the slug to a temperature at least about 50.degree. C. below the Md.sub.30 temperature of the stainless steel minus 30.degree. C. (b) extruding a portion of the cooled slug to provide the shank while simultaneously heating the remaining portion of the cooled slug to a temperature in the range of about Md.sub.30 minus 30.degree. C. to about 500.degree. C.; and (c) upsetting the heated remaining portion to provide the head.
Claims10
A method for making a fastener having a head and a shank from a slug consisting essentially of an AISI 200 or 300 series stainless steel having an Md.sub.30 temperature in the range of about 50.degree. C. to about 50.degree. C. comprising the following steps:
- (a) cooling the slug to a temperature of at least about 50.degree. C. below the Md.sub.30 temperature of the stainless steel minus 30.degree. C.;
- (b) extruding a portion of the cooled slug to provide the shank while simultaneously heating the remaining portion of the cooled slug to a temperature in the range of about Md.sub.30 minus 30.degree. C. to about 500.degree. C.;
- and
- (c) upsetting the heated portion to provide the head.
Dependencies are inferred from the claim text.