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Method of roller spinning cup-shaped metal blanks

  • US 3,991,598 A
  • Filed: 06/06/1975
  • Issued: 11/16/1976
  • Est. Priority Date: 06/06/1975
  • Status: Expired due to Term
First Claim
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1. In a method of making a cup-shaped sheet metal pulley blank of the type having a bottom wall and a connected outer cylindrical side wall terminating in an open end, from a flat sheet metal disc with pressure roll forming means, for use as a stage blank for forming a V-grooved pulley, including the steps of:

  • a. providing a flat uniform thickness sheet metal disc having a central hole formed therein;

    b. clamping a central portion of the disc around the hole between opposed relatively axially movable complementary clamping faces of rotatable headstock and tailstock die means wherein the headstock die means also has cylindrical flange-forming means and reentrant conical flange forming means connected with the cylindrical flange forming means by a reentrant corner acutely angled in cross section;

    c. rotating the die means and clamped disc;

    d. reforming the disc into a cup-shaped blank having a flat bottom wall and a connected annular reversely angled conical flange portion terminating in an axially extending open-ended cylindrical side wall portion by pressure rolling, forming and ironing the rotating annular disc metal portions surrounding said central portion against the headstock die means cylindrical and conical flange forming means and the connected reentrant corner;

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