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我厂生产的液压汽车起重机回转支承(交叉滚子内齿式)滚道中心直径1020毫米;表面光洁度▽ 7;椭圆度0.05毫米;角度内齿圈90°±4′;上下圈42°±2′;滚道经表面淬火硬度HRC 55～60;深度3～5毫米。原加工工艺是:粗精车采用齐齐哈尔产C516A车床,车制后滚道经表面淬火,抛光后进行装配。这种工艺方法,因淬火变形,经抛光后虽然光洁度得到提高,但滚道的几何精度仍达不到设计要求。
Hydraulic cranes of our factory slewing ring (crossed roller internal gear type) Raceway center diameter 1020 mm; surface finish ▽ 7; ovality 0.05 mm; angular gear ring 90 ° ± 4 ’; upper and lower ring 42 ° ± 2 ’; Raceway surface hardness HRC 55 ~ 60; Depth of 3 ~ 5 mm. The original processing technology is: coarse car using Qiqihar produced C516A lathe, the car after the raceway surface hardening, polishing assembly. This process, due to quenching deformation, after polishing although the finish is improved, but the geometric accuracy of the raceway is still less than the design requirements.