一、创制经过在1956年以前,我厂缺少加工人字齿轮的机床,因此对于一些轧钢机的齿轮,不得不请外厂代铣。但本市专门承接这种任务的厂家很少,往往应接不暇而把交货日期拖延,甚至有拖到半年以上的,这就影响了加速社会主义的建设。而且在加工过程中,对于齿形的尖端,因退刀关系要预先车去余隙,把一对本来设计得很好的人字齿轮,车去中间隙槽而铣成双冠齿轮,对齿轮强度及使用寿命都有影响。这时,我厂领导就发动群众,要大胆创造和 I. Creation After 1956, our factory lacked machine tools for processing herringbone gears, so for some of the rolling mill gears, I had to ask the outside plant for milling. However, there are only a few factories in this city that specialize in undertaking such tasks. They often delay the delivery date and even delay the delivery date. This has affected the acceleration of socialist construction. And in the process of machining, for the tip of the tooth shape, due to the relationship between the retracted knife, it is necessary to go to the clearance in advance and put a pair of herringbone gears that are originally designed well, and then the car goes to the middle clearance groove to mill into double crown gears. Both strength and service life have an effect. At this time, the leaders of our factory mobilized the people to boldly create and