重量270公斤以上,直径公差要求为5微米,不圆度为1.25微米,两轴端不同心度为3.38微米的大型精密转子在磨加工时的定心是较困难的。由于转子端较软,因此若把转子直接支撑在顶尖上磨削,往往达不到精度要求,使用活顶尖也难以达到精度要求,因此使用了如图所示的顶尖套。顶尖套是淬火 With a weight of 270 kg or more, the diameter tolerance requirement of 5 μm, the out-of-roundness of 1.25 μm, and the centering of the large precision rotor with the different concentricity of 3.38 μm on both axial ends are more difficult to grind. Due to the softer rotor end, if the rotor is directly supported on the tip grinding, often not meet the accuracy requirements, the use of live top is also difficult to achieve accuracy requirements, so the use of the top sleeve as shown. The top sleeve is quenched