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在机械加工中有时会遇到需要切削富有弹性之类的材料,如橡皮等;如果采用切削金属的方法来切削这种材料,是行不通的。苏联乌拉尔电器工厂设计了几种特殊的刀具,专门用来切削如图1所示的各种橡皮垫圈,效果很好。刀具的几何形状如图2所示,其中甲、乙、丁三种是用来车削外表面、孔和斜面;丙是双刃刀,专门用来切削图1乙的特种垫圈。刀具的特点是:楔角特别小,一般取β=4°～7°;前角特别大,一般取γ=75～80°;刀具的后角α=5°～8°。加工直径为4～20公厘的孔时,采用如图3的特殊钻头,它的切削刃角φ
In the machining sometimes encounter the need to cut flexible materials such as rubber, etc .; If the use of cutting metal cutting this material will not work. The Soviet Union Ural electrical factory designed several special tools, designed to cut a variety of rubber washers shown in Figure 1, the effect is very good. The geometry of the tool is shown in Figure 2, where A, B and D are used for turning the outer surface, holes and bevels. C is a double-edged knife designed to cut the special washer of Fig. Tool is characterized by: wedge angle is particularly small, generally take β = 4 ° ~ 7 °; anterior horn is particularly large, generally take γ = 75 ~ 80 °; cutter angle α = 5 ° ~ 8 °. Processing diameter of 4 to 20 mm hole, the use of special drill in Figure 3, its cutting edge angle φ