Patent ID: 6458225
Filing Date: 2002-10-01
Classification: B23K,B23P,C21D

Abstract:
A method of machining a braking surface to be frictionally engaged with a brake pad for enhancing braking strength and length of service life by ultrasonic oscillations applied to rework a previously machined braking surface presenting a working surface having tooling marks and exhibiting tensile stress, comprising the steps of: impacting said machined braking surface with ultrasonic oscillations developed in a coordinated set of individual impacting elements ultrasonically driven by an ultrasonic transducer to induce on and beneath said work surface a modified work surface layer thus smoothing and hardening the braking surface to produce a longer wearing and stronger braking surface, said oscillations being of sufficient intensity to effect surface and sub-surface plastic deformation resulting in removal of the tooling marks thereby producing at said braking surface a smoothed plastic deformation surface having frictional abutment properties for engagement with a brake pad while reducing scuffing and heat checking under conditions of dry sliding contact and frictional loading with a surface of the brake pad and presenting a strengthened braking surface thus extending operating life of the braking surface.