周期误差为0.39″的2.16米天文望远镜的驱动齿轮副,直径为1.92米的大齿轮我们是用滚齿加工成的。对半精滚和精滚所使用的齿轮滚刀都进行了钼化处理,处理后,大大改善了耐磨性,在连续滚切9～14万次的情况下,尚能保持刀具的齿形精度,切出了高精度齿轮。对这只大齿轮切了三刀,每切完一刀都对齿轮和刀具进行了测量、观察和分析。刀具磨 The drive gear pair for the 2.16-meter telescope with 0.39 "period error and the 1.92-meter-diameter gearwheel are machined by hobbing. Both the hob and the hob used for the precision roll are molybdenum , After treatment, greatly improving the wear resistance, continuous hobbing 9 ~ 140,000 times, still able to maintain the tooth profile accuracy of the cutter, cut out the high-precision gear.To this big gear cut three knives, Gear and tooling was measured, observed and analyzed every time a knife was cut