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进一步改善拉削过程的一个方向就是将切削速度提高到20～50米/分,并采用硬质合金拉刀。但是由于现有拉床的切削速度范围不够广泛(一般为0.5～12米/分),因而限制了高速拉削的应用。为了提高切削速度,对7A540卧式拉床进行了改进,在该机床上加工汽轮机叶片切口,由于缩小了液压缸和活塞的直径,得以将切削速度上限提高到30米/分,用此拉床进行了各种比较试验,其中包括:切削力、每对叶片中的应力、用P18高速钢拉刀拉削(V=1.5米/分)
To further improve the broaching process in one direction is to increase the cutting speed to 20 ~ 50 m / min, and the use of carbide broach. However, the application of high-speed broaching has been limited due to the fact that the broaching speed of the existing broaching machine is not wide enough (typically 0.5 to 12 m / min). In order to improve the cutting speed, the 7A540 horizontal broaching machine was improved, and the steam turbine blade cutting was processed on the machine tool. Due to the reduction of the diameter of the hydraulic cylinder and the piston, the cutting speed upper limit was raised to 30m / min. Various comparative tests were carried out, including: cutting force, stress in each pair of blades, broaching (V = 1.5 m / min) with a P18 high speed steel broach