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Testing and Analyzing Tapping Torques with TiN Coated Taps

Zhu Fanglai et al  
By testing and analyzing the tapping torques with and wrthout TiN coated taps, it is found that the torque when coated tape machine ZG45 is influenced by the cuttingdata. When choosing relatively lagre tapping engagement and fast feed speed, the torque of coated taps is greater than that of taps without AN coatings and the tapping Process is unstable.The relation of the torque of coated taps with cutting speed takes on the curve form of camel humps. Coated taps are applicable when tapping engagement is small, feed speed is low and cutting speed is high.
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