我厂YA7232A磨齿机的锥体铜轴承,有三条相隔120°的左螺旋不通槽(如图1所示)。过去,曾在SV18K捷克车床上进行车削加工;也曾在铣床上加装专用铣削装置作铣削加工,但因槽宽狭不一及深浅不同而不能符合图纸要求。由于螺旋槽的导程S=120mm,螺旋升角β=aretg(S/πd),又因该铜轴承是锥孔,所以各段的直径d是不同的,故螺旋升角是个变量。为计算方便起见,d_0取平均直径。即:d_0=(D+d)/2=(64+38)/2=51mm,则β=arctg120/(π×51)≈37°,所以刀具应有53°的刃倾角(图2)。试验证明:为了减少车削时的振动,需把车刀最低点G抬高0.8mm。这样,车刀与工件接触的最高点 I plant YA7232A grinding machine cone copper bearings, there are three separated by 120 ° left screw through the groove (as shown in Figure 1). In the past, turning lathes on the SV18K Czech lathe have been used. Milling machines have also been equipped with milling machines for milling, but due to the different widths and depths, the drawings can not be obtained. Because the lead of the spiral groove is S = 120mm and the screw angle is βg arertg (S / πd), and because the copper bearing is tapered, the diameter d of each section is different. Therefore, the lead angle of screw is a variable. For computational convenience, d_0 takes the average diameter. That is, if d_0 = (D + d) / 2 = (64 + 38) / 2 = 51mm, then β = arctg120 / (π × 51) ≈37 °, so the tool should have an inclination of 53 ° (Figure 2). Test proved: In order to reduce the vibration when turning, need to raise the lowest point G turning tool 0.8mm. In this way, the highest point of contact between the turning tool and the workpiece