按现在习用的方法加工碳钢冲模下模和冲头的销孔,不仅生产效率低,而且不能保证孔的几何尺寸精度。零件在钻孔和铰孔后进行热处理,但在热处理过程中因产生变形而影响销孔的几何尺寸精度。为了减少加工劳动量并使销孔得到稳定的几何尺寸,某厂采用了新的制造工艺。下模和冲头的销孔先在钻床上钻 According to the conventional method of processing carbon steel die punch and punch pin hole, not only low production efficiency, but can not guarantee the accuracy of hole geometry. Parts are heat treated after drilling and reaming, but the geometry of the pin hole is affected by the deformation during heat treatment. In order to reduce the amount of processing labor and pin hole to get a stable geometry, a plant using a new manufacturing process. The lower die and punch pin hole drilling in the first drill