我厂在1958年大跃进时,制造过一批軋銅设备。其中20吨冷拔机的减速裝置部分,有大批銅瓦軸承座的阶台孔需要加工。当时由于设备不足,是用老的鏜孔刀具,效率很低,跟不上下一道工序的需要。为了解决这个关鍵問題,車間技术員和工人同志一起研究討論,认为鏜孔效率低的主要原因,是由于单刀切削不能发揮机床的效率,对刀和磨刀的时間也较长,故考虑改用多刀切削。这样,效率是提高了,但是刀子一多,需要对刀的时间就更多了。再經大家研究的结果,利用偏心盘能調节中心距的原理,在盘的两个对边各装一把刀,长的做光刃,短的做毛刀,这样节約了换刀时的对刀时間。但是还有一点,工件阶台孔中间有的孔精度較高,当 I plant in the Great Leap Forward in 1958, created a number of rolling copper equipment. One 20 tons of drawing machine deceleration device part, there are a large number of copper bearing holes need to be machined platform. At that time, due to lack of equipment, is the old boring tool, the efficiency is very low, can not keep up with the needs of the next process. In order to solve this key issue, workshop technicians and workers comrades discussed and discussed that the main reason for the low efficiency of boring is that single-pole cutting can not exert the efficiency of a machine tool and the time for cutting and sharpening is relatively long Consider switching to multi-cutting. In this way, the efficiency is improved, but the knife more than one, need more time on the knife. By the results of our study, the use of eccentric disc can adjust the principle of the center distance, in the two opposite sides of the plate each equipped with a knife, long to do light blade, short to do the knife, thus saving tool change On the knife time. However, there is another point, the workpiece hole in the middle of some high precision hole, when