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科洛姆纳内燃机车制造工厂试验了??赛维亚科夫硬质合金刀具. 这些刀具有如下的特点:主切削刃各点前角γ与主切削刃刃倾角λ是变化的.由刀尖到对称中心线的区段上的两个角是正角,因此可以防止刀尖在冲击重荷下崩落和减轻切削过程. 在用不同的切削规范车削钢和铸铁时对切削力的测量表明,变前角车刀工作时的切削力比一般车刀工作时要小. 这些车刀供铸铁加工和钢的断续切削加工之用.钢零件的连续车削因车刀不能保证断屑而比较困难. 图1为加工铸铁零件用的车刀,其切削规范为:
The Kolomna diesel locomotive factory tested the Viivsk carbide cutting tools, which have the following characteristics: the rake angle γ at each point of the main cutting edge varies with the main cutting edge inclination λ, The two corners on the section from the cusp to the center of the symmetry are positive angles so that the tip can be prevented from breaking down and reducing the cutting process under impact loads.Measurements of cutting forces when turning steel and cast iron with different cutting specifications show that The working force of the front corner turning tool is smaller than that of the ordinary turning tool.It is used for the processing of cast iron and the intermittent cutting of steel.Continuous turning of the steel parts is difficult because the turning tool can not guarantee chip breaking. Figure 1 for the machining of cast iron parts turning tool, the cutting specifications are: