【摘要】 声发射监测系统在成型磨齿消空程过程中容易发生砂轮碰撞问题。为了在提高磨齿加工效率的同时确保磨齿加工的安全性，基于数控成型磨齿机的在线测量系统，提出一种砂轮起始下刀点计算方法。利用测头测量齿槽廓形点的坐标并进行对中修正，随后采用多项式最小二乘法对齿槽测量点进行拟合，对测头半径进行补偿后得到齿槽廓形。根据齿槽的理论廓形构建砂轮理论模型，在MATLAB上建立砂轮的理论廓形，求解砂轮理论廓形与齿槽廓形的最短距离并确定砂轮的起始下刀点。结果表明：采用多项式拟合齿槽廓形，3次多项式的拟合误差最小，砂轮起始下刀点的模拟值与实际值的偏差绝对值在0.03 mm左右，能够满足实际加工需求。更多还原

【Abstract】 The acoustic emission monitoring system is prone to grinding wheel collision in the eliminating idle process of forming gear grinding.In order to improve the efficiency of gear grinding and ensure the safety of gear grinding processing, a method for calculating the starting tool point of grinding wheel was proposed based on the on-line measurement system of CNC forming gear grinding machine.The coordinates of the tooth groove profile point were measured by the probe and corrected, and then the tooth groove point was fitted by polynomial least squares method, and the tooth groove profile was obtained after compensating the radius of the probe.The theoretical model of the grinding wheel was constructed according to the theoretical profile of the tooth groove, the theoretical profile of the grinding wheel was established on MATLAB,the shortest distance between the theoretical profile of the grinding wheel and the tooth groove profile was solved, and the starting tool point of the grinding wheel was determined.The results show that the fitting error of the three-dimensional polynomial is the smallest when the tooth groove profile is fitted by polynomial, and the absolute deviation between the simulated value and the actual value of the starting tool point of the grinding wheel is about 0.03 mm, which can meet the actual machining requirements.更多还原