摘要
目的 为实现叶片抛磨的高效率和高表面质量一致性,提出了一种叶片双面对称抛磨路径规划方法。方法 首先,该方法以叶片中弧线设计参数为基础,建立基于中弧线法线的叶片对称抛磨轨迹,实现双侧抛磨轮接触叶片时一一对应。其次,为实现抛磨过程中百叶轮与叶片表面法向接触,基于中弧线的法向量构建机器人的姿态约束方程,优化机器人末端运动轨迹。最后,以叶片双侧抛磨路径的距离为基础建立机器人第七轴控制模型,在四点TCP标定法的基础上改进适用于内部坐标系的标定,解决叶片装夹偏差问题,最终实现叶片双面对称抛磨。结果 仿真及实验结果表明,所提出的叶片双面对称抛磨轨迹规划方法,使两叶片表面平均粗糙度值分别由0.5、0.8μm降低到0.29、0.36μm。在叶片形状轮廓误差方面,两叶片由最大轮廓度误差1.301 mm和0.384 mm降低到平均截面轮廓误差分别为0.449 mm和0.137 mm。并且采用双面同时抛磨的方式,使抛磨时间缩短50%。结论 考虑到叶片的叶盆和叶背曲面存在曲率变化一致的趋势,将中弧线作为叶片抛磨路径规划、机器人末端姿态约束的基础,经理论分析和实验验证,该叶片抛磨路径规划方法具有可行性,且有效提高了叶片表面加工质量一致性和抛磨效率。可为机器人双面抛磨叶片的高表面加工质量、高轮廓度一致性和抛磨效率提供理论依据。
It is an improved blade surface polishing path planning method,which realizes the high efficiency and high surface quality consistency of blade polishing.The unstable polishing caused by the one-sided force on the blade during single-sided polishing is an obstacle to the good surface shape and integrity of the blade after polishing.The work aims to investigate the symmetric polishing path planning of the blade.In order to realize the one-to-one correspondence when the double-sided polishing wheel contacts the blade,the cross-section lines of the concave and convex surfaces of the blade are extracted as the basis of the polishing path planning,and the mean line of the cross-section line is solved after discrete sampling of the cross-section line.The symmetric polishing trajectory of the blade is established based on the normal of the mean line,and the one-to-one corresponding double-sided polishing path is obtained by extending the normal of each discrete point to the concave and the convex surfaces from the starting end of the mean line.In order to achieve consistent contact between the impeller and the blade surface during the polishing process,the attitude constraint equations of the robot are constructed based on the normal vectors of the mean line to optimize the robot's end motion trajectory.Finally,the seventh axis control model of the robot is established on the basis of the distance of the polishing path on both sides of the blade,combined with the structural characteristics of the double-sided polishing platform.On the basis of the standard four-point TCP calibration method,the calibration applicable to the internal coordinate system is improved to solve the blade clamping deviation and finally realize the double-sided symmetric polishing of the blade.Two aero-engine blades are selected to analyze the minimum radius of curvature of the concave and convex surfaces,and to determine the parameters of blade polishing,such as the size of the polishing wheel,the abrasive size,and the rotational speed.The double-sided symmetric polishing trajectory planning and actual polishing experiments are carried out.Compared with the double-sided polishing path based on the planning of the normal direction of the blade cross-section curve,the method proposed has a smaller normal contact error,which can better ensure the integrity of the shape of the blades during the polishing.The experimental results show that the average roughness of the two blade surfaces is reduced from the initial 0.5μm and 0.8μm to 0.29μm and 0.36μm,respectively.In terms of blade shape contour error,these two blades were reduced from the maximum contour error of 1.301 mm and 0.384 mm to an average cross-section contour error of 0.449 mm and 0.137 mm,respectively.Compared with that before polishing,the mean and variance of the surface roughness after polishing are greatly reduced.In addition,the use of simultaneous polishing on both sides reduces the polishing time by 50%.The method proposed takes the mean line as the basis of blade polishing path planning and robot end attitude constraints,and the theoretical analysis and experimental verification show that the blade polishing path planning method is feasible and effectively improves the consistency of blade surface processing quality and polishing efficiency.It can provide theoretical basis for the high surface quality,high contour consistency and polishing efficiency of the robot double-sided blade polishing.
作者
马晓龙
张学乾
刘佳
李秀红
程龙
MA Xiaolong;ZHANG Xueqian;LIU Jia;LI Xiuhong;CHENG Long(College of Mechanical Engineering,Taiyuan University of Technology,Taiyuan 030024,China;Shanxi Provincial Key Laboratory of Precision Machining,Taiyuan 030024,China)
出处
《表面技术》
北大核心
2025年第14期128-140,195,共14页
Surface Technology
基金
国家自然科学基金(52105474,52375460)
山西省回国留学人员科研资助项目(2023-58)。
关键词
叶片
机器人
百页轮
对称抛磨
轨迹规划
blade
robot
flap wheel
symmetric polishing
trajectory planning
