It can improve both the internal and the external surface precision in short time, especially fit to machine weird internal hole, turbine laminas, narrow but deep trough and so on.

• 它能在短时间内降低工件内、外腔表面粗糙度，尤其适合光整加工零件异型内部孔道,叶轮或模具异型面,窄而深槽及缝隙等。