Approaches for Improving Structure Stiffness and Joint Accuracy of Robots

FANG Lijin; SUN Longfei; XU Jiqian

doi:10.16080/j.issn1671-833x.2018.04.034

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Approaches for Improving Structure Stiffness and Joint Accuracy of Robots

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- Approaches for Improving Structure Stiffness and Joint Accuracy of Robots
- Aeronautical Manufacturing Technology Vol. 61, Issue 4, Pages: 34-40(2018)
- 作者机构：
  
  1. 东北大学机器人科学与工程学院,沈阳,110819
  2. 东北大学机械工程与自动化学院,沈阳,110819
- 作者简介：
- 基金信息：
- DOI：10.16080/j.issn1671-833x.2018.04.034
  CLC：
- Published：2018
- 稿件说明：
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房立金，孙龙飞，许继谦. 提高机器人结构刚度及关节精度的方法[J]. 航空制造技术, 2018, 61(4): 34-40.

FANG Lijin, SUN Longfei, XU Jiqian. Approaches for Improving Structure Stiffness and Joint Accuracy of Robots[J]. Aeronautical Manufacturing Technology, 2018, 61(4): 34-40.
房立金，孙龙飞，许继谦. 提高机器人结构刚度及关节精度的方法[J]. 航空制造技术, 2018, 61(4): 34-40. DOI： 10.16080/j.issn1671-833x.2018.04.034.

FANG Lijin, SUN Longfei, XU Jiqian. Approaches for Improving Structure Stiffness and Joint Accuracy of Robots[J]. Aeronautical Manufacturing Technology, 2018, 61(4): 34-40. DOI： 10.16080/j.issn1671-833x.2018.04.034.

摘要

传统工业机器人具有工作空间大、结构紧凑、灵活性好等优势，已由早期的物料搬运、点焊、喷涂等操作逐渐应用于制孔、铣削、磨削等高精度金属切削加工领域。然而，工业机器人相比于机床刚性较弱，金属切削过程中的切削载荷使机器人末端刀具偏离期望的加工轨迹，外部激振力极易引发机器人颤振，影响机器人加工精度；此外，关节减速器内部齿隙也会严重影响机器人精度。对采用机器人刚度优化、机器人加工误差补偿、机器人传动间隙补偿、机器人加工振动抑制等提高机器人精度方法的研究现状做了总结，提出了两种提高机器人精度的机器人结构改进设计，分别为基于双电机驱动的无间隙传动机器人结构和基于四边形机构的高刚性机械臂结构，并对新型机器人的结构特点进行了阐述。

Abstract

Traditional industrial robots have advantages of large workspace

compact structure

and good flexibility

and have been gradually used in the high precision metal cutting fields of drilling

milling and grinding instead of material handling

spot welding

spray painting and other operations. However

the stiffness of industrial robots is weak compared with metal cutting machine tools. The weak stiffness of the robot makes the tool deviate from the desired machining trajectory

and makes the robot easy to chatter when it is subjected to the external excitation force

which affects the machining accuracy of the robot; in addition

the internal backlash of the joint reducers is also one of the most important factors affecting the machining accuracy of the robot. The research status of robot stiffness optimization

robot machining error compensation

backlash compensation of the robot and vibration suppression of the robot are summarized. Two kinds of robot structure improvement design are proposed to increase the accuracy of the robot

the robot structure of non-backlash driving based on dual-motor drive and the high stiffness robotic arm based on parallelogram mechanisms are respectively described. And the structural characteristics of the robot are elaborated.

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