国内普通机床齿轮花键孔大多采用外径定心形式,需用推刀校正其因热处理引起的变形。由于校正孔是用自由推削或用导向推削,均会不同程度地将花键孔定心圆推斜,使孔的几何形状、齿轮的径向和端面跳动等误差加大,满足不了日益提高的精度要求。当前,世界先进工业国家的机床行业,为了提高齿轮的传动精度和使用寿命,已广泛采用中硬和硬齿面,齿面硬 Most of the domestic machine tool gear spline holes centering on the outer diameter, the need to push the knife to correct its deformation due to heat treatment. As the correction hole is a free-wheeling or guided by the push, will be different degrees of spline hole centering round push oblique, so that the hole geometry, the radial and face of the gear beating error increases, can not meet the ever-increasing Accuracy requirements. At present, the machine tool industry in the world’s most advanced industrial countries, in order to improve gear transmission accuracy and service life, has been widely used in hard and hardened, hard tooth surface