轴类零件在机械加工中的基准大都为中心孔,为了保证在轴两端所钻出的中心孔具有正确位置,则第一道工序必须在钻中心孔前铣两端面,而且不论毛坯的尺寸或大或小,都希望所铣掉的加工余量是均匀的。这不仅是本工序加工余量均匀的问题,同时还影响到 Axis parts in the machining of the benchmark for most of the central hole, in order to ensure that the center hole drilled at both ends of the shaft has the correct position, the first process must be before drilling the central hole before and after milling both ends, and regardless of the size or large blank Or small, all hope that the milling allowance is even. This is not only the problem of uniform processing allowance, but also affects this process