The Influence of Tool Geometric Parameters on the Reliability of Deep Cryogenic High Speed Steel Taps

The selection of geometric parameters of cryogenic tap has a direct effect on the reliability of tools and the precision of processed workpiece. Based on nonsubstitute Type-I Censoring Life Tests, a mathematical model in dynamic reliability of cryogenic tap is built, and the change of its reliability is explored. Combined with cutting tool life expansion equation, the effects of geometric parameters on wear life are presented. The results show that of the geometric parameters, rake angle taps in its effect on reliability with the increase in machining time and impact loading action, thus the quality of rake angle should be controlled directly or indirectly so as to reduce its influence on reliability of cutting tool, which can ultimately improve the reliability of cutting tool and the precision of processed workpiece. Meanwhile, the proposed method provides a theoretical basis for improvements of the reliability of tool system.