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张勇, 汪帅兵, 谢红霞, 马铁军. 机器人点焊恒流控制的分流补偿模型[J]. 焊接学报, 2012, (2): 81-84.
引用本文: 张勇, 汪帅兵, 谢红霞, 马铁军. 机器人点焊恒流控制的分流补偿模型[J]. 焊接学报, 2012, (2): 81-84.
ZHANG Yong, WANG Shuaibing, XIE Hongxia, MA Tiejun. Model to compensate for shunt of constant current control of robot spot welding[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2012, (2): 81-84.
Citation: ZHANG Yong, WANG Shuaibing, XIE Hongxia, MA Tiejun. Model to compensate for shunt of constant current control of robot spot welding[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2012, (2): 81-84.

机器人点焊恒流控制的分流补偿模型

Model to compensate for shunt of constant current control of robot spot welding

  • 摘要: 根据机器人点焊恒电流控制的特点和点焊过程的电阻变化规律,建立了连续点焊时三种情况即在待焊点的一侧存在一个已焊点和两个已焊点以及在待焊点的两侧各存在一个已焊点的分流补偿模型.利用模拟分流模型,在固定式交流点焊机上进行了点焊分流采样试验.结合试验和理论计算数据,获得了多种厚度的低碳钢连续点焊时分流与点距的关系.根据建立的分流补偿模型计算补偿电流,在固定式点焊机上进行了模型验证试验.结果表明,经过分流补偿后,熔核直径的最大相对差率约为1.3%,证明了补偿模型的有效性.

     

    Abstract: According to the characteristics of the constant current control and the resistance change during the process of spot welding,compensation model to calculate the shunt of the consecutive spot welding was established for three different cases of consecutive spot welding respectively.There is only one nugget in the first case.There are two nuggets in the second case,both nuggets are located on the same side of the spot welding.There are also two nuggets in the third case,but they are located on the both sides of the spot welding.In order to test the reliability of the shunt compensation model for the first case,a simulation model was applied on the fixed type spot welding machine to test the spot shunts under the different dot pitches,materials and thickness.Based on the data tested and calculated,the impact of diversion law was analyzed;the relationship between the shunt of low carbon steel with different thickness,material and the dot pitch as well as the compensation were proposed.Eventually first model validation test on the fixed type spot welding machine was implemented.Results demonstrate a substantial improvement of weld quality and reduction of process variability with the proposed compensation model.

     

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