基于数控加工的三爪小滚子定心夹具移动凸轮设计计算

发布时间：2018-02-11 10:17

本文关键词： 三爪定心夹具小滚子移动凸轮数值计算数控加工　出处：《机床与液压》2017年22期 　论文类型：期刊论文

【摘要】：针对三爪小滚子定心夹具移动凸轮理论曲线复杂、难以在数控机床上直接实现加工的问题,提出三爪小滚子定心夹具移动凸轮的数值计算方法,可有效解决这一数控加工的问题。介绍三爪小滚子定心夹具的结构与工作原理,提出一种对移动凸轮曲线进行等步长采样计算的数值求解方法,将采样得到的采样点按照数控加工容易实现的二次多项式曲线进行插值拟合,然后定义各参数数值,代入数据将利用数值求解方法的二次多项式曲线与实际的理论曲线进行比较,发现在验证的区间内曲线误差远小于利用传统理论曲线加工产生的误差,分析误差比较结果,提出可以通过细化采样步长和分段插值拟合循环计算的方法来提高精度。分析结果表明:利用数值计算方法,可以有效解决移动凸轮不易加工的问题,具有较好的经济效益。
[Abstract]:Aiming at the problem that the theoretical curve of the moving cam of the three-claw small roller centering fixture is too complex to be machined directly on the NC machine tool, a numerical calculation method of the three-claw small roller centering fixture moving cam is presented. The structure and working principle of the three-claw small roller centering fixture are introduced, and a numerical solution to the equistep sampling calculation of the moving cam curve is presented. The sampling points are interpolated and fitted according to the quadratic polynomial curve which is easy to realize in NC machining, and then the values of the parameters are defined. In the substitution data, the quadratic polynomial curve of the numerical solution method is compared with the actual theoretical curve. It is found that the error of the curve in the verified interval is much smaller than that produced by the processing of the traditional theoretical curve, and the result of error comparison is analyzed. The precision can be improved by thinning sampling step size and piecewise interpolation fitting cycle calculation. The results show that the numerical method can effectively solve the problem that the moving cam is difficult to be machined and has good economic benefit.
【作者单位】：沙洲职业工学院机械动力工程系;
【基金】：2012年国家科技重大攻关项目(2012ZX0401031) 2015年江苏高校品牌专业建设工程资助项目(PPZY2015B184)
【分类号】：TG659;TG75

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