基于插补算法的曲面螺旋槽数控加工速度前瞻控制方法

A Prospective Control Method for CNC Machining Speed of Curved Spiral Groove Based on Interpolation Algorithm

为了对曲面螺旋的数控加工速度进行有效控制,提出一种基于插补算法的曲面螺旋槽数控加工速度控制方法。首先,以基函数理论中的NURBS方法定义加工标准,在保证曲面螺旋加工构造的基础上,选择曲面螺旋加工控制点位置;然后,设定曲线权值因子,建立高精度方程,求取拟合矩阵,基于插补算法对控制节点矢量与位置的关系进行拟合;最后,根据加减速与位移的关系,采用向上取整的方式进行修正插补,从而实现对曲面螺旋槽数控加工的速度控制。以曲面螺旋槽数控加工的轴向加速度控制为测试对象进行实验,结果表明,采用此方法能够消除连接点的速度冲突,减少机床对曲面螺旋加工的冲击。

In order to effectively control the speed of CNC machining of curved spiral groove,a method of CNC machining speed control of curved spiral groove based on interpolation algorithm is proposed.Firstly,the machining standard is defined by NURBS method in basis function theory,and the control points are selected on the basis of ensuring the structure of surface spiral machining.Then,the curve weight factor is set up,the high-precision equation is established,the fitting matrix is obtained,and the relationship between the control node vector and the position is fitted based on the interpolation algorithm.Finally,according to the relationship between acceleration and deceleration and displacement,the speed control of spiral machining of curved surface is realized by using the upward rounding method.The experimental results show that this method can eliminate the velocity conflict of the joint points and reduce the machining impact of the machine tool on the curved spiral groove.