Titanium alloy, with superior mechanical properties, is widely used to manufacture key parts in the aerospace industry. Nonetheless, there exist some problems in machining titanium alloy, such as low machining efficiency, serious tool wear, and difficulty to guarantee the surface quality. In this paper, the comparative experimental study is conducted on milling the titanium alloy TC11 with indexable milling cutters and self-propelled rotary milling ones, and the wear process of the two types of cutters is explored to have found how the milling force, chip micro-morphology, and machined surface quality of theirs vary according to milling length. The experimental results indicate that compared with indexable milling cutters, self-propelled rotary milling cutters show relatively minor and slowly increasing cutting forces. Moreover, self-propelled rotary milling cutters show better wear resistance; that is, the flank wear is more evenly distributed along the cutting edge and the wear rate is slower. The two types of cutters both produce serrated chips, but the curling degree of the chips produced by self-propelled rotary milling cutters is comparatively larger than that by indexable milling cutters, and with the increase of milling length, the former produces more regular chip morphology and evener sawtooth distribution. When the cutting edge wear is slight, the machined surface quality by the two types of cutters does not differ a lot. However, with the increase of the milling length, the wear of indexable milling cutters becomes increasingly serious, and the machined surface quality by it becomes a lot worse as some defects occur such as holes and tearing on the workpiece surface. In comparison, the surface roughness of self-propelled rotary milling cutters get worsen slowly.

钛合金具有卓越的机械性能，被广泛用于制造航空航天业的关键零件。然而，钛合金的加工存在一些问题，例如加工效率低，刀具磨损严重，难以保证表面质量。本文对可转位铣刀和自走式旋转铣刀铣削TC11钛合金进行了对比实验研究，探索了两种刀具的磨损过程，以发现铣削力，切屑微-形态，其加工表面质量随铣削长度而变化。实验结果表明，与可转位铣刀相比，自走式旋转铣刀显示出相对较小且缓慢增加的切削力。此外，自走式旋转铣刀具有更好的耐磨性；也就是说，侧面磨损沿切削刃分布更均匀，磨损速率较慢。两种刀具均产生锯齿状切屑，但自走式旋转铣刀所产生的切屑的卷曲度要比可转位铣刀所产生的切屑的卷曲度大，并且随着铣削长度的增加，前者会产生更规则的切屑形态锯齿分布均匀。当切削刃的磨损很小时，两种刀具的加工表面质量差别不大。但是，随着铣削长度的增加，可转位铣刀的磨损变得越来越严重，并且由于某些缺陷（例如工件表面上的孔和撕裂）的出现，加工的表面质量也因此变差了。相比之下，自走式旋转铣刀的表面粗糙度会慢慢变差。