工具材の繰返し落下試験装置の試作

切削工具のじん性の非切削試験法 (第1報)

抄録

The conventional testing methods of tool toughness are transverse rupture test, Charpy impact test, etc. But the results of these testing methods do not represent actual tool toughness in cutting, especially, in intermittent cutting with carbide tool. The objective of this study is to develop a methodology to assess cutting edge toughness simply and reliably. This method is an impact test n which a tool material repeatedly hits the fresh surface of a comparatively soft material corresponding to the material cut so that intermittent cutting can be simulated as close as possible in view of stress situation at the cutting edge and dynamic behaviour. Some feasibility tests have revealed that this method is valid for estimating tool toughness against chipping observed at the initial stage of cutting. The Weibull plot of the relation between cumulative probability of chipping and impact frequency generally becomes linear and the mean impact frequency is affected by the impact frequency energy.