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目前,国内许多普通机床齿轮及花键副大多采用外径定心的花键孔,利用外圆的精确配合保证定心精度,且加工容易,但对于毂孔表面硬度较高的工件,运用外径定心时,需用推刀来校正外径的热处理变形,由于推刀在毂孔内作自由推削,没有定位导向装置,极易将花键孔定心圆推斜,造成齿轮端面跳动和齿向等参数超差。当前,欧美等先进工业国家的机床行业,为提高齿轮及花键副的传动精度和使用寿命,已广泛采用了中硬和高硬的齿面;齿面硬度最高已达HRC62以上,对于采用高频或渗碳整体淬火的钢齿
At present, most of the domestic common gear and spline machine tools use the outer diameter of the spline hole centering, the use of precise matching with the outer circle to ensure centering accuracy, and easy processing, but the hub hole surface hardness of the workpiece, the use of outside Diameter centering, you need to use a push knife to correct the outer diameter of the heat treatment deformation, the pushrod in the hub hole for free push, there is no positioning guide, easy to spline hole centering round push oblique, causing gear beating and teeth Out of tolerance to other parameters. At present, the machine tool industry in Europe and the United States and other advanced industrial countries, in order to improve gear and spline vice drive precision and service life, has been widely used in the hard and high hard tooth surface; tooth surface hardness reached the highest HRC62 above, Frequency or carburizing overall hardened steel teeth