车削螺纹时发生“啃刀”现象的分析

Analysis on Phenomenon of "Gnaw Knife" While Cutting Thread

车削螺纹时发生的"啃刀"现象,其主要原因是:刀架部件刚度变化;加工硬化和小滑板产生了爬行。防止产生此现象的方法是:调整中、小滑板的塞铁间隙;保持车刀刃口的锋利以减小加工硬化程度,同时可在车刀前刀面上磨出圆弧和预防"爬行"产生。

The main reason of the phenomenon of ＂gnaw knife＂ while cutting thread includes the stiffness change of the knife rest,work hardening,and the crawling of the small feeding carriage.The methods to prevent the phenomenon are discussed as follows： adjusting the gap of iron wedge of medium and small feeding carriage,keeping the edge sharpness of the turning tool to reduce the work hardening degree,and meanwhile,grinding the rake face of the turning tool to a circular-arc shape and preventing the ＂crawling＂problem.