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在图一所示工件的法兰盘背面锪孔、扩孔或倒角,采用普通刀具是很难进行的。但如采用一种能张缩的特殊结构刀具,则可顺利进行加工。图2所示刀具,叫做倒锪刀,可满足上述要求。当锪刀右转(逆时针方向)前进,刀座刚要接触工件时,刀座连同刀片立即翻转收拢。即锪刀尺寸变小而进入预制孔中。当回转刀座从孔的另一端出来时,由于离心力的作用,刀座和刀片便翻转张开。这时锪刀右转倒行,其切削刃即可在孔的背面进行倒锪或倒角加工。加工完毕,刀座退到孔外,主轴左转,刀座再翻转收拢、倒锪刀退出孔来。
Hole in the back of the flange of the workpiece shown in Figure 1, reaming or chamfering, the use of ordinary tools is difficult. However, such as the use of a special structure can shrink tool, you can smooth processing. The tool shown in Figure 2, called a trowel, meets the above requirements. When trowel turn right (counterclockwise) forward, the knife just to contact the workpiece, the knife together with the blade immediately flip Shoulong. That trowel smaller size and into the prefabricated hole. When the rotary knife holder comes out from the other end of the hole, the knife holder and the blade turn open due to the centrifugal force. At this time trowel turn right, the cutting edge to the back of the hole upside down or chamfer processing. Processing is completed, the knife back to the hole, the spindle left turn, turn the knife and then folded, inverted trowel to exit the hole.