硬质合金刀具正交车铣TC4钛合金磨损形貌及机制分析

Analysis of Wear Characteristics and Mechanisms of Carbide Tools when Orthogonal Turn-milling TC4 Titanium Alloy

在车铣复合加工中心Mazak Integrex 200Y上,切削速度为v=150、200 m/min及干式切削条件下,采用硬质合金刀具H13A对钛合金TC4进行正交车铣(顺铣)磨损试验。研究表明高速正交车铣钛合金时,正常磨损阶段前刀面出现不同程度切屑黏结及积屑瘤,后刀面主要以黏结磨损为主,磨损相对均匀;急剧磨损阶段,前刀面切屑黏结加剧,形成连续切屑,缠绕刀具;后刀面由于黏结作用刀具材料被切屑黏结物带走,形成黏结凹坑。刀具磨损的主要原因为黏结磨损、氧化磨损,通过X射线电子能谱(XPS)证明刀具磨损表面有TiO_2、WO_3和Co_3O_4等氧化物生成,分析其对刀具磨损的影响。

The machining investigations are carried out on Mazak Integrex 200Y machining center at the cutting speed of 150m/min and 200 m/min under the condition of down-cutting ＆ dry-cutting experiment of TC4 Titanium alloy with H13A Carbide tools.The study results show that there were some Build-Up Edge （BUE） and adhered chip on the tool tip radius and the rake face mainly.Uniform was the adhesion wear on the flank face in the cutting stage of tool wear. Chips bonding were aggravated on the rake face andformed continuous chip, leading to twine the cutting tool. Tool material was taken away by adhered chip and pit formed due to bondingeffect. The main causes of the tool wear were adhesion wear and oxidation wear. There are a lot of oxide, such as TiO2, WO3 andCo304 etc., produced in oxidation of tool wear surface, which are proved by X-ray Photoelectron Spectroscopy （XPS）.