Prestressed brake drum or rotor

Details Prestressed brake drum or rotor Prestressed brake drum or rotor

1991-10-16

1994-10-04

Wyszomierski, George

Metal treatment

Process of modifying or maintaining internal physical...

Heating or cooling of solid metal

148583, 148612, 72 53, B21D 5334

Patent

active

053523059

ABSTRACT:
Uniformly distributed compressive stresses are induced in the machined surfaces of brake drums and brake rotors. The compressive stresses cancel residual tensile stresses induced in the surfaces by machining operations during fabrication. Cancellation of the surface tensile stresses delays formation of cracks during brake service use and extends the service life of the brake drum or rotor. Shot peening is an applicable prestressing process which also imparts a surface roughness that reduces the time required to burnish bake pads to match the shape of the drum or rotor surface. The reduction of burnishing time reduces the amount of surface cracking caused by surface heating by brake pad high spots as the high spots are ground down.

REFERENCES:
patent: 3630323 (1971-12-01), Hickle
patent: 3670392 (1972-06-01), Haas
patent: 4175070 (1979-11-01), Klein et al.
patent: 4241597 (1980-12-01), Golata et al.
patent: 4262407 (1981-04-01), Peterson et al.
patent: 4948437 (1990-08-01), Metzler
patent: 4961791 (1990-10-01), Metzler et al.
patent: 5193375 (1993-03-01), Meister
Shot Peening Applications, 7th Ed., Booklet published by the Metal Improvement Co., Inc. of Paramus, N.J.

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