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Alternative TitleDesign and Motion Control of the High Precision Heavy Load Friction Stir Welding Robot
宛敏红; 周维佳; 骆海涛; 田远征
Source Publication机器人
Volume40Issue:6Pages:817-824, 834
Indexed ByEI ; CSCD
EI Accession number20191206655101
Contribution Rank1
Funding Organization国家科技重大专项(2010ZX04007-011) ; 国家自然科学基金(51505470)
Keyword搅拌摩擦焊机器人 重载 高精度 双电机消隙 挠度补偿

针对高强度大型复杂曲面零件的高精度搅拌摩擦焊需求,研制开发了一种重载搅拌摩擦焊(friction stir welding,FSW)机器人.为使机器人具有大工作空间与灵巧作业能力,选择串联机构作为机器人构型,并阐述了高精度重载机构的设计与刚度校核方法.推导了腕关节含间隙的动力学模型,提出了双电机消隙控制方法,并对不同负载与偏置电流下的消隙效果进行了仿真分析,结果显示主动消隙方法能有效抑制传动间隙造成的位置波动与误差.为消除z轴在自重与焊接力作用下的挠度变形,提出了一种挠度主动补偿方法,构建了动力学模型与控制策略,仿真结果显示挠度补偿系统能快速有效地抑制挠度造成的轨迹误差.FSW机器人样机焊接实验表明,所提出的机器人在重载作业中能实现高精度的轨迹控制.

Other Abstract

To meet the high precision demand of friction stir welding (FSW) for high strength large parts with complex surface a heavy load FSW robot is developed. In order to make the robot have large working space and dexterous operation ability, the serial mechanism is chosen as the robot configuration, and the design and stiffness checking method of the high precision mechanism under heavy load are elaborated. Dynamic model of the wrist joint with clearance is deduced, and the dual motor backlash elimination control method is proposed. Backlash elimination effect simulations for different loads and bias currents are carried out, and the results show that the active backlash elimination method can effectively suppress the position fluctuation and error caused by the transmission backlash. Furthermore, in order to eliminate the deflection deformation of the z axis under the action of self weight and welding force, a deflection active compensation method is proposed, and the dynamic model and control strategy are constructed. The simulation results show that the trajectory errors caused by deflection deformation can be quickly and effectively suppressed by the deflection compensation system. The FSW robot prototype experiment shows that the robot can realize high precision trajectory control under heavy load.

Citation statistics
Document Type期刊论文
Corresponding Author宛敏红
Recommended Citation
GB/T 7714
宛敏红,周维佳,骆海涛,等. 高精度重载搅拌摩擦焊机器人设计与运动控制[J]. 机器人,2018,40(6):817-824, 834.
APA 宛敏红,周维佳,骆海涛,&田远征.(2018).高精度重载搅拌摩擦焊机器人设计与运动控制.机器人,40(6),817-824, 834.
MLA 宛敏红,et al."高精度重载搅拌摩擦焊机器人设计与运动控制".机器人 40.6(2018):817-824, 834.
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