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若能降低刀具切削刃的单位负荷,就可增大切削用量,提高生产率。降低切削刃上单位负荷的途径之一是增大刀具的前角γ,然而,增大刀具前角是有限度的,不能因此而降低切削刃强度。在立式车床上加工大型毛坯件的冷硬表层时,增大前角γ在很多情况下是不可能的,这是因为切削刃负荷不稳定;存在毛坯表面缺陷层;余量分布不均匀;切削断面大。为提高切削刃的强度,取刀具前角γ=(5°～25°),然而,这实质是增大切削力,使切削功率提高10～25％。
If you can reduce the unit load cutting edge, you can increase the amount of cutting, improve productivity. One of the ways to reduce the unit load on the cutting edge is to increase the tool rake angle γ. However, increasing the tool rake angle is limited and can not reduce the cutting edge strength. When machining a chilled surface of a large blank in a vertical lathe, it is impossible to increase the rake angle γ in many cases because the cutting edge load is unstable; there is a blank surface defect layer; the remaining margin is unevenly distributed; Cutting section big. In order to improve the cutting edge strength, take the tool rake angle γ = (5 ° ~ 25 °), however, this is essentially to increase the cutting force, the cutting power increased by 10 to 25%.