在以工艺方法提高产品质量的措施中,进一步提高机加工的精度尤其重要。其中最复杂的问题是如何使箱体件孔达到高的同心度。重要产品中孔的同心度必须保证在 0.5～3 μm以内。但是不论用高精度应标镗床镗孔,或是外加研磨工序,在 300 mm长度上孔的同心度往往达不到10μm。这表明 In the process of improving the quality of products by means of measures to further improve the accuracy of machining is particularly important. One of the most complex problems is how to make the box piece hole to achieve high concentricity. Important products in the hole concentricity must be guaranteed within 0.5 ~ 3 μm. However, the concentricity of the hole is often less than 10 μm at 300 mm length, either with a high-precision bore-boring boring machine or with an additional grinding process. This indicates