三、花键孔电解整形齿轮经过热处理(渗炭、淬火)后,内孔会产生收缩变形,有时收缩量往往超过其公差下限,长期以来没有找到较好的解决办法。齿轮花键孔的变形是热处理的一大难关,过去解决的办法是:通过热处理工艺试验,提出各种齿轮内孔收缩量的数据,并要求冷加工按提出的数据拉孔,这就是冷热加工配合的办法。但这种方法不尽其善,总有一小部分齿轮的内孔变形不规则,必须在热处理后进行内孔修正处理。常用的办法是用推刀扩孔,但因齿轮经淬火,内孔已硬化,用推刀扩孔很困难,而且推刀使用寿命很短。同时推刀与齿轮定位面的垂直度得不到保证,常常使扩孔后 Third, the spline hole Electrolytic gear after heat treatment (infiltration charcoal, quenching), the hole will have shrinkage deformation, and sometimes the amount of shrinkage is often more than the lower limit of its tolerance, a long time has not found a better solution. Gear spline hole deformation is a major obstacle to heat treatment, the past solution is: through the heat treatment process test, put forward a variety of gear bore shrinkage data, and requested by the proposed data processing cold hole, which is hot and cold processing With the approach. However, this method is not good, there is always a small part of the irregular deformation of the gear bore, hole must be heat treatment after correction. Commonly used method is to push the hole reaming, but the gear is hardened, the hole has hardened, reaming with a push knife is very difficult, and push the knife life is very short. At the same time push the knife and gear positioning surface of the verticality can not be guaranteed, often after reaming