节点文献
五轴联动螺旋锥齿轮磨齿机各轴几何误差测量与补偿
【作者】 龙云泽；
【导师】 唐进元；
【作者基本信息】 中南大学 ， 机械电子工程， 2010， 硕士
【摘要】 数控机床几何位置精度是机床评定的重要指标,直接影响到机床的加工精度。如何提高数控机床的几何位置精度成为目前研究的关键问题。对于高精密数控机床,机床几何精度的提高至关重要,但是机床部件加工误差及机床装配误差等误差给机床几何位置精度提高带来了困难。采用数控系统误差补偿的方法可以使数控机床获得较高的几何精度,且具有成本低的优点。本文结合螺旋锥齿轮加工原理及齐次坐标变换方法,建立螺旋锥齿轮数控磨齿机YK2050几何误差模型。并分析五轴定位误差对齿轮齿面精度的影响,为螺旋锥齿轮加工精度提高和机床误差建模提供参考。机床几何误差测量直接关系到机床几何误差数学模型的准确性,且影响到机床误差补偿的效果。本文采用激光多普勒位移测量仪测量螺旋锥齿轮数控磨齿机YK2050直线轴及回转轴共16项几何误差,并采用ISO 230-2(1997)标准进行机床几何误差评定。为机床出厂误差评定提供了参考。本文对软件误差补偿法及SINUMERIK 840D系统误差补偿方法进行了研究。在数控磨齿机YK2050上进行了误差补偿实验,分别对直线轴和回转轴定位误差进行补偿。实验结果表明,数控系统误差补偿效果较好,机床几何精度得到了明显提高。采用CMM齿轮检测仪测量磨齿机误差补偿前后所加工齿轮齿面误差。通过比较齿面误差验证机床几何精度的提高可提高机床加工精度。实验结果表明,螺旋锥齿轮数控机床的几何精度提高,其齿轮加工精度也提高。
【Abstract】 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.