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我厂生产的L—3型车床,采用铸造铜合金的开合螺母。车削中长期存在着振纹和让刀严重,螺口松、里面紧,达不到精度要求,一般认为振纹是刃口太锋利和后角过大所致。而刃口用油石研钝,后角改小又引起让刀,有时加工的零件既有振纹,又有严重让刀。一般情况下,只能采用低速、多窜刀来减轻振纹和让刀程度,勉强达到质量要求,但加工效率明显降低。我们在长期的实践中,逐渐地摸索了一种规律,对刀具的角度进行了改进,解决了产生振纹和让刀的质量问题,现简单介绍如下。
I plant L-3-type lathe, the use of casting copper alloy opening and closing nuts. Long-term existence of vibration in the turning and let the knife serious, loose screw, which tight, can not reach the accuracy requirements, the general view is that the vibration is too sharp blade edge and the horn is too large due. The edge with whetstone research blunt, small angle after the corner caused by the knife, and sometimes the processing of both the existing parts of the vibration pattern, but also a serious knife. Under normal circumstances, only low-speed, multi-channel knife to reduce the vibration and let the knife level, barely meet the quality requirements, but significantly reduced processing efficiency. In our long-term practice, we have gradually explored a law that has improved the angle of the tool, solved the problem of vibration and the quality of the knife, and are briefly introduced below.