MVI56-PDPMV1
MVI56-PDPMV1
MVI56-PDPMV1
数控机床中常用的插补法计算方法有逐点比较插补法、数字积分插补法、数据采样插补法等。
逐点比较插补法
基本思想是被控对象在按要求的轨迹运动时,每走一步都要和规定的轨迹比较一下,由比较结果决策下一步运动的方向。这种算法是以折线来逼近直线或圆弧,插补误差小于一个脉冲当量。因此,只要将脉冲当量(每走一步的距离)取得足够小,就可达到加工精度的要求。逐点比较法可以作直线插补,也可以作圆弧插补。
用逐点比较插补法控制机床,每走一步要完成4个拍节:
偏差判别:判别刀具的实际位置对规定图形的偏离位置,以决定进给方向;
进给:沿减少偏差的方向进给一步,以向规定图形靠拢;
偏差计算:计算刀具在新位置上对规定图形的偏差,作为下一步偏差计算的依据;
终点判别:判断是否达到终点。若未到终点,回到偏差判别后继续重复上述循环过程,若达到终点,发出运算完成信号。
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6ES7516-3AN02-0AB0 2 |