S-SHAPE DETECTION TEST PIECE AND A DETECTION METHOD FOR DETECTING THE PRECISION OF THE NUMERICAL CONTROL MILLING MACHINE

摘要

The present invention relates to an "S" shaped detection test piece for comprehensively detecting the precision of the numerical control milling machine and the detection method thereof. The detection test piece consists of an "S" shaped equal thickness edge strip (1) and a rectangular base (2), respectively forming two "S" shaped curves in two different planes and the projections of which in the base plane (3) cross each other and have open and close angle (alpha) states formed at the intersection. The tube vernier calipers is directly used in the detection method to measure the thickness of the "S" shaped edge strip (1) and analyze and decide the five-axis coordinated precision according to the thickness of the upper and lower parts and different areas of edge strip (1); and the RTCP function of machine tool, the validity of post-processing programs and the spatial motion precision of machine tool are further analyzed and decided according to smoothness of the tool path of the combining site of the detection base plane (3) and the edge strip (1) and smoothness of the edge strip profile.