目的 提高硬质合金刀片加工TC4钛合金的表面质量。方法 利用化学机械抛光技术对传统磨削的硬质合金刀片分别进行粗抛、半精抛和精抛处理，运用正交试验法，在常温干切和–50 ℃冷风条件下，分别采用传统磨削的硬质合金刀片（磨削刀片）与化学机械抛光的硬质合金刀片（抛光刀片）进行切削TC4钛合金正交试验，利用方差分析法分析切削参数对已加工表面粗糙度Ra的影响。运用多元线性回归方法建立磨削刀片、抛光刀片在常温干切和–50 ℃冷风条件下切削TC4钛合金已加工表面粗糙度Ra的经验预测模型。结果 硬质合金刀片前刀面通过粗抛、半精抛和精抛后，刀片前刀面的表面粗糙度Ra为19 nm。当切削参数相同时，磨削刀片在–50 ℃冷风条件下切削TC4钛合金的已加工表面粗糙度，比常温干切条件下平均降低了35.9%；抛光刀片在–50 ℃冷风条件下切削TC4钛合金的已加工表面粗糙度，比常温干切条件下平均降低了43.5%。在常温干切条件下，抛光刀片比磨削刀片切削TC4钛合金的已加工表面粗糙度平均降低了19.2%；在–50 ℃冷风条件下，抛光刀片比磨削刀片切削TC4钛合金的已加工表面粗糙度平均降低了28.7%。抛光刀片在–50 ℃冷风条件下切削TC4钛合金的已加工表面粗糙度Ra，比磨削刀片在常温干切条件下切削TC4钛合金的已加工表面粗糙度Ra平均降低了54.4%。结论 采用对硬质合金刀片表面进行化学机械抛光技术和以–50 ℃冷风为切削介质的组合工艺，可有效降低TC4钛合金已加工表面粗糙度。

The work aims to improve the surface quality of TC4 titanium alloy machined with cemented carbide inserts. Chemical mechanical polishing (CMP) technology was adopted to treat the rake face of cemented carbide insert which has been treated with the grinding process by rough polishing, semi-polishing and fine polishing. Under the condition of dry cutting at room temperature and the cooling air at –50 ℃, the orthogonal experiment for the cutting of TC4 titanium alloy with the grinding cemented carbide inserts (grinding inserts) and chemical mechanical polished cemented carbide inserts (polished inserts) were carried out, respectively. The effect of cutting parameters on the surface roughness Ra of TC4 titanium alloy machined with grinding insert and polished insert under the condition of dry cutting at room temperature and the cooling air at –50 ℃ was studied by ANOVA. The machined surface roughness empirical prediction models for grinding and polished inserts in cutting TC4 titanium alloy was established by the multiple linear regression method. After the rake face of cemented carbide insert was pre-treated with rough polishing, semi-polishing and fine polishing, the surface roughness Ra of the rake face of the cemented carbide insert was 19 nm. Under the same cutting parameters, the surface roughness of TC4 titanium alloy machined with grinding insert under the condition of cooling air at –50 ℃ was 35.9% lower than that machined under the condition of dry cutting at room temperature; and the surface roughness of TC4 titanium alloy machined with polished insert under the condition of cooling air at –50 ℃ was 43.5% lower than that machined under the condition of dry cutting at room temperature. The surface roughness of TC4 titanium alloy machined with polished insert under the condition of dry cutting at room temperature was 19.2% lower than that machined with grinding insert; and the surface roughness of TC4 titanium alloy machined with polished insert under the condition of cooling air at –50 ℃ was 28.7% lower than that machined with grinding insert. The surface roughness of TC4 titanium alloy machined with polished insert under the condition of cooling air at –50 ℃ was 54.4% lower than that machined with grinding insert under the condition of dry cutting at room temperature. It can be concluded that the machined surface roughness of TC4 titanium alloy can be effectively reduced with the combination process of using chemical mechanical polishing technology to treat the surface of cemented carbide insert and taking cooling air at –50 ℃ as a cutting medium.