我厂合理化建议组根据圆形刨刀的原理,设计了一种八方形精刨刀,它的结构如图1所示。图中1是刀杆;2是刀头,用螺钉3、垫圈4和螺帽5固定在刀杆1上。这种刨刀的优点是:1)能节省刀杆材料;2)刀片的使用寿命很长。精刨铸铁件所采用的切削用量是:切削深度t=0.05～0.2公厘;走刀量s=10～18公厘/往复行程;切削速度V=8～15公尺/分。如果用精刨来代替刮研,则所采用的切削用量是:切削深度 According to the principle of circular planing cutter, our factory rationalization proposal group designed an octagonal planer cutter whose structure is shown in Fig.1. 1 is a knife bar; 2 is a cutter head, with a screw 3, a washer 4 and a nut 5 is fixed on the arbor 1. The advantages of this planer knife is: 1) to save the bar material; 2) blade life is very long. Cutting precision cast iron parts used are: cutting depth t = 0.05 ~ 0.2 mm; walking amount s = 10 ~ 18 mm / reciprocating stroke; cutting speed V = 8 ~ 15 m / min. If you use a fine planing instead of scratch research, the cutting used is: cutting depth