拉刀刀尖表面微结构单点金刚石刀具制备及降载机制

摘要/Abstract

摘要： 为研究单点金刚石刀具制备的拉刀刀尖表面微结构的降载机制，利用激光蚀刻和单点金刚石刀具在同一把拉刀的不同区域制备了圆坑形微结构，并结合搭建的拉削实验系统进行了微结构拉刀和常规拉刀的对比拉削试验。试验结果表明单点金刚石刀具制备的微结构能更有效地降载,这是因为:单点金刚石刀具在制备微结构的过程中能在刀尖表面产生压应力，并且使拉刀刀尖表面更平整;此外，单点金刚石刀具制备的微结构一方面减少了刀工屑的真实接触面积，另一方面又削弱刀尖和工件、切屑的黏附作用，减小切屑的厚度，有效地降低拉削过程中的负载。

关键词: 单点金刚石刀具, 激光蚀刻, 微结构拉刀, 降载机制

Abstract: In order to study the load reduction mechanism of broach tip surface microstructures prepared by SPDT, the crater microstructure was prepared in different areas of the same broach by laser etching and SPDT respectively. Contrast broaching experiments of microstructured broach and conventional broach were carried out by the established broaching experiment system. The results show that the microstructure prepared by SPDT may reduce the load more effectively. The reason is that the SPDT may produce compressive stress on the tip surface and make the surface of the broach tip more flat. On one hand, the microstructure fabricated by SPDT may reduce the real contact area of tool-chip. On the other hand, the microstructure may weaken the adhesion among tool tip, workpiece and chip, and reduce the thickness of chip and the load in broaching processes.

Key words: single point diamond tool(SPDT), laser etching, microstructured broach, load reduction mechanism

中图分类号:

TG156

吕俊杰;倪敬;蒙臻;任旭;冯凯;俞虹飞;王艺蒙. 拉刀刀尖表面微结构单点金刚石刀具制备及降载机制[J]. 中国机械工程.

LV Junjie;NI Jing;MENG Zhen;REN Xu;FENG Kai;YU Hongfei;WANG Yimeng. Surface Microstructure and Load Reduction Mechanism of Broach Tip Prepared by SPDT[J]. China Mechanical Engineering.

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