我厂在加工某零件时,要在25公厘厚的钢板上钻一个φ65A_7的通孔。这孔过去是用φ35、φ48、φ60三种尺寸的钻头,和φ65的扩孔钻分成四次钻出的。不但效率低,工具消耗大,而且孔内的钢料全被切成废切屑了。后来郑荣禄同志改进了一种套料刀,用它来加工这孔,不但提高了效率,而且可以套出一块圆钢板,节约了原材料。套料刀的结构如附图,在刀杆1上有两个方孔,装两个刀头2和3,分 When I process a certain part in our factory, we should drill a φ65A_7 through hole in the steel plate of 25 mm thick. This hole used to be φ35, φ48, φ60 three sizes of drill bits, and φ65 reaming drill drilled into four times. Not only inefficient, expensive tools, but also all the holes in the steel cut into scrap. Later, Jung Jung-lok improved a nest knife, use it to process the hole, not only to improve efficiency, but also set out a round plate, saving raw materials. Tapping knife structure as shown in the drawings, there are two square holes in the arbor 1, installed two heads 2 and 3, points