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CASE Super Finishing

C.A.S.E Isotropic Superfinishing Process

The technique of C.A.S.E.™ (Chemically Assisted Surface Enhancement) isotropic superfinishing (also known as Isotropic Finishing) has been developed as a metal surface treatment that provides components with excellent bending and contact fatigue strength with resistance to high loading.

How superfinishing works

Controlled shot peening is followed by chemical surface isotropic finishing which gently removes any metal asperities but retains valleys for optimum oil retention, reducing surface friction and operating temperatures.

How the isotropic superfinishing process works

MIC SuperfinishThe component is firstly shot peened, which is a cold working process creating multiple indentations in the surface using spherical media called shot. As each indentation is made, the surface will try to yield but is restrained by the substrate, introducing a residual compressive stress and removing any prior manufacturing tensile residual stresses. This proven technique makes the surface resistant to crack initiation and propagation. The intensity and coverage of the shot peening process is carefully specified prior to any work being carried out.

Secondary processing by shot peening (dual peening) at a lower intensity and modified shot size will have the effect of reducing surface roughness and increasing the compressive stress and cold working of the near surface providing additional benefit.

Final machining is then carried out in a controlled and gentle manner using non-abrasive finishing stones together with oxalic acids where the most positive or peak surface areas are progressively removed producing a mirror-like surface finish.

Applications and key benefits of the isotropic superfinishing process

Applications for the isotropic superfinishing process

· Gears

· Transmission gears and shafts

· Bearings

· Cams and followers

· Journals

· Seal faces

Key benefits of the isotropic superfinishing process

· Optimum surface roughness and stress characteristics

· Surface reduction to mirror like finishes

· Reduced contact/surface fatigue

· Increased lubrication retention and heat transfer

· Reduction in lubricant temperature

· Reduced transmission noise

· Prevents micro and macro pitting

· Finishes suitable for microbiological cleansing and sterilisation

· Good rounding ability to sharp edges for ease of handling and assembly

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