Research and Application of Electrode Pressure Balancing Control in Robot Resistance Spot Welding

HAN Wei; LI Dongdong; TONG Zhou; TAN Yi

doi:10.7512/j.issn.1001-2303.2024.03.17

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Research and Application of Electrode Pressure Balancing Control in Robot Resistance Spot Welding
Vol. 54, Issue 3, Pages: 112-117(2024)
Published： 25 March 2024 ，
DOI： 10.7512/j.issn.1001-2303.2024.03.17

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韩伟，李冬冬，童洲，等.机器人电阻点焊电极压力均压平衡控制研究及应用［J］.电焊机，2024，54（3）：112-117.

HAN Wei, LI Dongdong, TONG Zhou, et al.Research and Application of Electrode Pressure Balancing Control in Robot Resistance Spot Welding[J].Electric Welding Machine, 2024, 54(3): 112-117.
韩伟，李冬冬，童洲，等.机器人电阻点焊电极压力均压平衡控制研究及应用［J］.电焊机，2024，54（3）：112-117. DOI： 10.7512/j.issn.1001-2303.2024.03.17.

HAN Wei, LI Dongdong, TONG Zhou, et al.Research and Application of Electrode Pressure Balancing Control in Robot Resistance Spot Welding[J].Electric Welding Machine, 2024, 54(3): 112-117. DOI： 10.7512/j.issn.1001-2303.2024.03.17.

摘要

针对车门翼板高强度双相钢机器人点焊中因为电极压力控制不当而出现的压痕、变形和扭曲等缺陷，分析电极压力对点焊质量的影响。采用ANSYS数值模拟软件比较分析不同电极压力下板材等效压力变化情况，分析结果显示，相较于电极压力为4 000 N，电极压力为3 000 N时，焊点等效压力波动较小，塑性变形也相对较小。针对车门翼板点焊，确定了合理的点焊电极压力为3 300 N，并设计了分阶段控制曲线，通过FANUC点焊控制系统对电极压力进行实时监测和补偿，有效控制了电极压力的波动。此外，利用均压平衡宏程序，可以根据板材形状变化和电极磨损等因素实时调整电极压力。试验结果表明，采用均压平衡控制后，电极压力波动控制在±5%以内，焊点表面压痕深度减少约20%，焊点质量明显提升。

Abstract

Aiming at the defects such as indentation

deformation and distortion caused by improper control of electrode pressure in spot welding of high-strength biphase steel of door wing plate

the influence of electrode pressure on spot welding quality was analyzed. ANSYS numerical simulation software is used to compare and analyze the equivalent pressure changes of the plate under different electrode pressures. The analysis results show that compared with the electrode pressure of 4000N

the equivalent pressure of the solder joint fluctuates less and the plastic deformation is relatively small when the electrode pressure is 3000N. For the spot welding of the door wing plate

the reasonable spot welding electrode pressure is determined to be 3300N

and the phased control curve is designed. The FANUC spot welding control system is used to monitor and compensate the electrode pressure in real time

and the fluctuation of the electrode pressure is effectively controlled. In addition

the pressure of the electrode can be adjusted in real time according to factors such as plate shape change and electrode wear with the use of the pressure equalization macro.The experimental results show that the electrode pressure fluctuation is controlled within ±5%

the indentation depth on the surface of the solder joint is reduced by about 20%

and the quality of the solder joint is obviously improved after using the equal-pressure balance control.

关键词

机器人点焊伺服焊枪电极压力数值模拟均压平衡

Keywords

robot resistance spot weldingservo gunelectrode pressurenumerical simulationequalizing balance

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