粉末冶金制品三坐标测量的基准定位方法

A method of setting benchmark of three coordinates for measuring P/M part

粉末冶金制品与机械切削加工的零件不同,其表面存在孔隙,表面粗糙,采用三坐标测量机测量其工作曲面时往往存在偏差,采用同线多点(>5)、同面多线(>3)的基准定位方法,可确保坐标系精确定位,测量误差减小及制品尺寸的准确测量。

As compared with the surface of as--machine part, the surface of P/M part is more rough and exists appearant pores. When measuring its profile with three-coordinate measur- ing instrument, there are often errors. If a method of multi-points(>5 points) on the same line and multi-lines (>3 lines) on the same profile is used in setting the measuring bench- mark, we can ensure to set coordinate accurately, to reduce the measuring errors and to mea- sure exactly the part dimension.