提高齿轮泵前盖与壳体的配合精度,是提高齿轮泵效率的重要途径之一,各厂家对此都甚为关注。而应用定位销是保证配合精度的关键,但是由于定位销孔孔径尺寸较小,仅为φ8_0~(+0.019)毫米,加工精度、内表面粗糙度等要求较高,虽经多方努力,采用各种加工方法,质量仍难以保证,对此我们进行了有益的探讨。 To improve the gear pump front cover and housing with the accuracy is to improve the efficiency of the gear pump one of the important ways, all manufacturers are very concerned about this. However, the application of the dowel pin is the key to ensure the accuracy of the dowel joint. However, due to the small aperture size of the dowel pin hole, φ8_0 ~ (+0.019) mm, the machining accuracy and the inner surface roughness are all higher. Processing methods, the quality is still difficult to guarantee, which we conducted a useful discussion.