我厂在检修1200×4500大球磨机和电铲时,经常碰到加工大型变位齿轮的任务。在我厂设备简陋的情况下,只能画出齿形,在 B665型牛头刨床上进行刨齿加工。经总结分析采用下面这种近似画法,画出的齿形既快,而又较准确。很快便可将整个变位齿轮的齿形画在齿坯上进行刨齿,而且加工出来的齿形和在大型铣、滚齿机加工的齿轮基本一样,误差较小。具体画法是:用两段圆弧代替渐开线齿形,近似画法如图。现以1200× I plant maintenance 1200 × 4500 large ball mill and electric shovel, often encounter the task of processing large displacement gear. In my factory crude equipment, can only draw the tooth shape, shaper in the B665 shaper processing. After the summary analysis using the following approximate method, the tooth profile drawn fast, but more accurate. Soon the tooth profile of the entire variable gear can be drawn on the tooth blank for gear cutting, and the tooth profile machined out is basically the same as the gear machined on a large-sized milling and hobbing machine with less error. Specific method is: use two arcs instead of involute tooth shape, approximate drawing as shown. Now with 1200 ×