钛合金的车削用量通常用如下关系式选择: VT~(0.22)S~(0.43)t~(0.23)=89 ①式中:V—切削速度(米/分);T—车刀耐用度(分);S—进给量(毫米/转);t—切削深度(毫米)。然而我们所作的研究表明,用装有BK8硬质合金刀片的车刀进行荒车和粗车,车刀的实际耐用度与用关系式(1)计算的相差甚远。车刀的耐用度试验是在IM63型机床上进行的。试验项目有车皮(荒车)、粗车、半精车和精车(见表)。试件是钛合金铸件和锻件,牌号为BT9、尺寸为φ300-φ320毫米, Titanium alloy turning amount is usually selected by the following relationship: VT ~ (0.22) S ~ (0.43) t ~ (0.23) = 89 ① Where: V- cutting speed (m / min); T- tool durability Min); S-feed (mm / rev); t-depth of cut (mm). However, our research shows that the actual durability of turning tools and roughing tools with turning tools equipped with BK8 carbide inserts is quite different from the relation (1). The lathe durability test is carried out on the IM63 machine. The pilot project has wagon (wagon), rough car, semi-fine car and fine car (see table). Specimens are titanium alloy castings and forgings, grade BT9, size φ300-φ320 mm,