In this paper, analysis on the fissuring accident of ZGMn13Cr2Mo antifriction tup is performed, and the reason is believed to lie in serious casting defects of shrinkage cavity, porosity and inclusion.

In the drilling process, the power spectrum of a drilling force is closely related to the drill wear.

In this paper,the cutting force signals in different drill wear conditions are decomposed and reconstructed using wavelet transform; and the changing characteristics of cutting force signals of time domains in different frequency bands are obtained.

Brush plating technology in handling the axle end wear of pit lifter;