PCD和硬质合金刀具车削钛基复合材料时刀具磨损特征研究

摘要

以原位生成晶须和颗粒混合增强钛基复合材料为车削对象,在切削速度为60~120 m/min的条件下,对聚晶金刚石(PCD)和硬质合金刀具开展了车削性能试验研究。研究表明,PCD 刀具的切削力为硬质合金刀具的77％~88％,其切削温度为硬质合金刀具的65％~82％。无论是高速切削,还是低速切削,PCD刀具都经历初期剧烈磨损而后稳定磨损的过程,而硬质合金刀具仅有急剧磨损的过程。刀具磨损特征方面,PCD刀具主要发生磨粒磨损和黏结磨损,硬质合金刀具主要发生月牙洼磨损、黏结磨损和扩散磨损。%The cutting performance comparison of polycrystalline diamond(PCD)and carbide tools was carried out when turning in-suit TiBw/TiCp reinforced titanium matrix composites at the cutting speed of 60~120 m/min.Research results show that three-dimensional cutting force of PCD tools is of approximate 77% to 88% of carbide tools,cutting temperature of PCD tools is of approximate 65% to 82% of carbide tools.PCD tools experienced initial severe wear and stable wear stage,while carbide tools only experienced severe wear stage.Furthermore,abrasive wear and adhesive wear are the pre-dominant wear forms of PCD tools.However,crater wears obviously arised on the rake face of carbide tools are adhesive wear and diffusive wear are the main wear forms.