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车刀切削部份,主要几何角度有5个,其几何角度的大小对切削是否顺利、刀具是否耐用、加工出的工件表面是否光洁等都有很大影响,因此,必须合理选择。 1.前角 前角对刀具的切削性能影响很大,前角增大,则刀刃锋利,切削起来轻快,切屑变形减小,从而减小切削力、降低切削温度、减小刀具的磨损。但前角过大,将导致切削刃强度降低,导热体积减小,易磨损,甚至崩口。不同材料的刀具,前角选取的大小也不一样,硬质合金车刀的前角,一般在-5°～25°之间选取,选择前角的主要原则是:
Turning part, the main geometric angle of 5, the geometric angle of the size of the cutting is smooth, the tool is durable, the workpiece surface is smooth and so have a great impact, therefore, must be a reasonable choice. 1. The rake angle has a great influence on the cutting performance of the tool. When the rake angle is increased, the cutting edge is sharp, the cutting speed is light and the chip deformation is reduced, thereby reducing the cutting force, reducing the cutting temperature and reducing the wear of the cutter. But the anterior horn is too large, will lead to reduced cutting edge strength, thermal conductivity, reduced volume, easy to wear, and even chink. Different materials, tools, rake angle selected size is not the same, Carbide lathe rake angle, generally selected between -5 ° ~ 25 °, choose the main principle of rake angle is: