A Feature-Based Flexible Customization Method of Error Modeling for Machine Tool

Error model customization for different work type of complex CNC equipments is significant to identify and compensate the errors of CNC integrated manufacturing, and further to achieve process optimization and product quality control. Traditional error modeling method is complicated, takes long time and is difficult to change itself. A flexible customized error modeling method based on feature and multi-body system (MBS) theory is proposed. Firstly, feature space of machine tool and Denavit-Hartenberg (DH) homogeneous transformation matrix space are build separately. Secondly, feature mapping function is deduced. Thirdly, customization method of error model is described. Finally, flexible customization system for error modeling based on feature is developed. Using this system and method to execute error modeling for several typical machine tools of Shenyang Machine Tool Group. It takes about 1minute to get an accurate error model. It can analyze single error´s percentage of total error. These are basis of error compensation. The practices indicate the method is effective and feasible. The method provides a new thought for error control, optimization of integrated manufacturing process, digital manufacturing and automation technology.