Composite brake drum and method for producing same

  • US 6,601,284 B1
  • Filed: 08/16/2000
  • Issued: 08/05/2003
  • Est. Priority Date: 12/27/1995
  • Status: Expired due to Term
First Claim
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1. A method for producing a composite vehicle brake drum comprising the steps of:

  • (a) providing a generally circular metal blank having an initial pilot hole inner diameter;

    (b) spin forming the metal blank to produce a one-piece brake drum component defining a center longitudinal axis and including a cylindrical shell having a squealer band which defines a squealer band outer diameter, a mounting flange extending radially inwardly from one end of the shell toward the center longitudinal axis, and an annular lip extending radially inwardly from an opposite end of the shell toward the center longitudinal axis, and wherein the shell, the flange, and the lip cooperate to define a cylindrical mold cavity;

    (c) subsequent to step (b), centrifugally casting a liner in situ within is the mold cavity of the brake drum component to thereby produce the composite vehicle brake drum; and

    (d) subsequent to step (c), machining the initial pilot hole inner diameter to a final pilot hole inner diameter by locating off of the squealer band outer diameter.

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