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文中利用有限差分法列出一组有限差分方程,并用外推法导出了差分方程的解,从而找出了变截面冲头的合理阶梯数目和各阶梯段的极限长度。并举例说明了选择凸模的实际步骤。
In this paper, a set of finite difference equations are listed by finite difference method, and the solution of difference equation is deduced by extrapolation. The reasonable number of steps and the limit length of each step are found out. An example is given to illustrate the actual procedure for selecting a punch.