机械

针对三坐标测量机表面数据化测量过程,本文给出一种实用的测头半径补偿算法。提出了采用两次细化测量点的策略,首先沿测量线进行测量点的插值细化,然后在测量线(截面)之间再次进行插值细化。在此基础上,对整个被测表面上各细化点,利用插值求导的方法求出其横向和纵向切向量,然后对切向量叉积求得各细化点的法向量,最后进行测头半径补偿计算。

A practical probe radius compensation is described in this paper for CMM measurements of the surface data.Propose a strategy that refine the measureing points two times,interpolate of the measureing points along the measureing line,then interpolate of the cross-sections.After this,derive the horizontal and vertical shear vector of the refineing points using methods of interpolation and derivation,and then cross-product the two shear vectors to obtain the law vector of each refineing points,and compensate the probe radius in the end.