Most of metal workpieces will produce surface oxidation in the forged hardening heating, this layer of oxide scale have serious destructive effect for parts chemical coating derusting, so it need shot blasting /peening cleaning. For parts need machining, cleaning oxide scale is a necessary condition for reducing the tool wear, improve the service life of cutting tools, keep machine precision, control forging stock size to obtain the best cutting state. It is more important for automatic machine tools.
After the final heat treatment of workpiece make shot peening can remove oxide scale and strengthen t workpiece.Almost most of the vehicles such as car gear ,tractor gear need to shot blast cleaning after heart treatment.
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