齿条的切制是三爪卡盘的零件中加工过程最复杂 的一种 。事实上,由两个不同中心的圆弧R及r给合起来的齿条齿形(图1),在很多工厂里都采用在立式铣床上加工。其工作过程极为复杂.结果精度不高.并需由高度熟练的技术工人来完成这一工作。 这种加工方法,首先要按齿条节距量变换进刀 The cutting of the rack is one of the most complicated processes in the parts of the three-jaw chuck. In fact, the rack-and-pinion profile (Figure 1), combined by the circular arcs R and r at two different centers, is machined on a vertical milling machine in many plants. The work process is extremely complicated, the result is not very accurate, and highly skilled skilled workers are required to do the job. This method of processing, first of all according to the amount of rack pitch change into the knife