Axis Of Each Axis Of The Spiral Bevel Gear Grinding Machine Geometric Error Measurement And Compensation

Geometric positioning accuracy which is an important indicator of Computer Numerically Controlled(CNC) machine assess directly affects machining accuracy. How to improve geometric positioning accuracy of CNC machine becomes an significant issue of present research. Improvement of geometric positioning accuracy is very crucial for high precision machine tool. But processing error and assembly error of machine tool hinder the improvement of geometric positioning accuracy. CNC machine can get high geometric positioning accuracy by adopting the method of error compensation of numerical control system.Geometric positioning error model of CNC grinding machine of spiral bevel gear(YK2050) is founded on the basis of spiral bevel gear's machining theory and Descart cordinate transformation. The effect of positioning error of the five axes on tooth precision is studied that is referrence for the improvement of machining accuracy of spiral bevel gear and modeling of geometric positioning error of machine tool. Measurement of geometric positioning error of machine tool directly affects the modeling and error compensation of the machine tool. Sixteen positioning errors of linear and rotational axes of spiral bevel gear(YK2050) are measured by using Laser Doppler Displacement Measurement Device. And the geometric positioning errors are assessed by using ISO 230-2 (1997),which is referrence for error assessment of newly produced produced machine tool.Software error compensation and error compensation of SINUMERIK 840D system is studied. Experiments about compensation of positioning error of linear and rotational axes is carryed out on CNC grinding machine of spiral bevel gear(YK2050). The result of experiments indicates that the effect of CNC error compensation is great. And geometric positioning accuracy of the machine tool is improved greatly. Tooth deviation of the grinding machine both before and after the error compensation are measured by using CMM gear measuring device. That improvement of geometric positioning accuracy of machine tool can improve its processing precision is testified by comparation of tooth deviation. The result of experiments indicates that improvement of geometric positioning accuracy of CNC machine tool of Spiral Bevel Gear can improve machining precision of gears.