铣削高强度钛合金TC18的刀具磨损机理

Wear Mechanism of Tool in Milling High-Strength Titanium Alloy TC18

采用无涂层和PVD涂层硬质合金可转位刀具对高强度钛合金TC18进行铣削加工,研究了钛合金TC18铣削加工过程中刀具的磨损形态和磨损机理.结果表明:在相同的加工条件下,采用PVD涂层硬质合金刀具加工TC18钛合金的寿命较长,前刀面主要磨损机理为黏结磨损和扩散磨损等,刀具失效形式为涂层剥落和随之而来的前刀面月牙洼磨损,后刀面除了黏结磨损和扩散磨损以外,还发生了磨粒磨损;无涂层硬质合金刀具的寿命较短,刀具的失效形式为崩刃.

As TC18 is difficult to machine,the cutting speed and tool life are the main obstructions to improve the production efficiency and manufacturing cost control when machining TC18.This paper presented the tool wear pattern and tool wear mechanism of milling TC18.The results show that in the same cutting parameters,the carbide tool with PVD coating（TiN＋TiAlN） has longer tool life than uncoated tool,the wear pattern is cater for diffusion and adhesive in the rake face after coating desquamated;while the wear pattern of uncoated tool is tipping.