Method for graphically evaluating the workpiece’s contour error in non-circular grinding process

To find and compensate the dynamic contour error of workpieces on CNC non-circular grinder, a graphic display and evaluation method is introduced. The programmed set and actual contours of workpiece are displayed through the outlines of grinding wheel at a series of set and actual positions. The dynamic contour error can be recognized directly on CNC control screen without extra measuring equipments as usual. The set and actual positions of grinding wheel related to workpiece are collected from the CNC controller and servo drives and further evaluated. This process is carried out after a dry-run cycle on the machine. Based on this method, a display and evaluation software module has been developed and integrated in the controller of a CNC non-circular grinder. It helps to find contour error and generate the compensation data. Grinding an eccentric test piece shows good result and advantage of the proposed method.

[1]  Lihua Wang,et al.  A new digital measurement method for accurate curve grinding process , 2008 .

[2]  Xincheng Tian,et al.  Dimensional error analysis and its intelligent pre-compensation in cnc grinding , 2008 .

[3]  Zbigniew Lechniak,et al.  Methodology of off-line software compensation for errors in the machining process on the CNC machine tool , 1998 .

[4]  Myeong-Woo Cho,et al.  Integrated error compensation method using OMM system for profile milling operation , 2003 .

[5]  S. Sartori,et al.  Geometric Error Measurement and Compensation of Machines , 1995 .

[6]  G. Sansoni,et al.  Combination of a Vision System and a Coordinate Measuring Machine for the Reverse Engineering of Freeform Surfaces , 2001 .

[7]  Ciro A. Rodríguez,et al.  Evaluation and modeling of productivity and dynamic capability in high-speed machining centers , 2007 .

[8]  Li Wei,et al.  Crankpin non-circular grinding progress error forecast and compensation based on RBF-NN , 2006 .

[9]  Tsann-Rong Lin,et al.  A novel reverse measurement and manufacturing of conjugate cams in a diesel engine , 2005 .

[10]  J Huan,et al.  Contour error compensation method for computer numerical controlled non-circular grinders , 2008 .

[11]  Aun-Neow Poo,et al.  Tracking and contour error control in CNC servo systems , 2005 .

[12]  Aun-Neow Poo,et al.  Error compensation in machine tools — a review: Part I: geometric, cutting-force induced and fixture-dependent errors , 2000 .

[13]  Takashi Miyoshi,et al.  In-Process Error Compensation for Tooth Form Grinding Works : Robust Error Estimation Algorithm against the Measuring Error and Experimental Result of the In-Process Grinding Error Compensation , 2001 .