Abstract
Abstract To improve tribological characteristics of dies for cold forging, micro valleys were formed on surface of cemented tungsten carbide dies by shot peening. The mean period of the surface roughness profile ( RSm ) of the shot peened (SP) die was approximately 1/3 times shorter that of the conventional mechanical polished (MP) die. The distribution of peaks and valleys of the surface profile ( Rsk ) was close to symmetric in the SP die ( Rsk = 0), while it was skewed toward peaks in the MP die ( Rsk
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