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我厂加工的许多零件的内孔光洁度都要求很高,除了很多需要精磨和研磨以外,其他大部分都要求7左右的光洁度。而且孔的公差很严格,大部分是A级的。因此,这些孔径在车出或镗出以后,还必须再用铰刀来铰孔。而且这些工件又大部分是经过调质处理的,硬度一般在Rc26～32的范围内。因此铰刀的刃口很容易用钝,在经过几次修磨以后,铰刀的外形尺寸就变小了,再铰孔时就达不到要求的公差。此外,由于调质后的
Many parts machined in our factory have high inner-hole finish, except for a lot of grinding and grinding, most of them require about 7 finish. And hole tolerance is very strict, most of the A-level. Therefore, these holes in the car or boring out later, you must also use reamers to reaming. And most of these workpieces are quenched and tempered, the hardness is generally in the range of Rc26 ~ 32. Therefore, reamer blade edge is easy to use blunt, after several grinding, the reamer size becomes smaller, and re-reaming reluctance to meet the required tolerance. In addition, due to the quenched and tempered