Through cutting experiments in which the contact length between chip and rake face of restricted contact cutter is reduced step by step, the variation principle of cutting force is studied.

通过切削试验，研究了限制接触刀具前刀面的刀—屑接触长度逐渐减小时切削力的变化规律。

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For cutting machine cutting and a car cut: the first step, choose 2 d cutting machine cutting, the second step, the input materials name, quantity, length and width;

针对剪板机切割和小车切割：第一步，选择二维剪板机切割，第二步，输入原材料名称、数量、长度和宽度；

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The relation of the step length of cutting tool with mechanical error when machining curved face in the 5 coordination NC machine, and the calculating formulas are deduced.

讨论了在五坐标数控机床上加工曲面时刀具走刀步长和切削带步长与加工误差的关系并推导了计算公式。

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