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由图1可知,外循环滚珠螺母反向孔的钻削部位距外圆轴线有一个距离H,孔的加工表面呈圆弧状态。钻削时由于△ABC是非实体状态,切削时存在一个反作用力F_1,迫使刀具向外侧移动一个距离如图1所示。从而使加工出的孔与轴线不平行,且孔的形状也达不到要求。尽管采用了钻扩铰工艺,并对切削用量进行了不同的选择,但由于其孔的加工工艺性太差,使得该孔孔距公差无法保证。其加工精度见表1。由表1可知,其加工偏差范围在-0.20～0.20mm,无一定的规律。合格率仅为26.7％。
As can be seen from Fig. 1, the drilling site of the reverse circulation hole of the outer circulation ball nut has a distance H from the outer circle axis, and the machining surface of the hole is in an arc state. As ABC is non-solid state during drilling, there is a reaction force F_1 during cutting, forcing the cutter to move to the outside by a distance as shown in FIG. 1. So that the processing of the hole and the axis is not parallel, and the shape of the hole also failed to meet the requirements. Despite the use of drilling and reaming process, and cutting the amount of different options, but due to poor processing of its hole technology, making the hole from the tolerance can not be guaranteed. The processing accuracy in Table 1. Table 1 shows that the processing deviation range of -0.20 ~ 0.20mm, no certain rules. Pass rate is only 26.7%.