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借助有限元分析手段对某型压路机压轮的焊接过程进行模拟,得到了焊后压轮的残余应力分布。采用盲孔法对压轮振动时效前后残余应力进行了测试与评价,并对模拟结果进行了验证。结果表明:压轮焊后焊缝位置附近残余应力大,峰值为338.6 MPa。起弧位置的应力小于收弧位置,封口板焊缝与卷圆板焊缝交叉位置的残余应力呈下降趋势。残余应力分布的模拟结果与试验结果吻合得较好,误差为19%,证明了模拟结果的准确性。设计支撑块宽度为60mm;4点支撑在振动平台上呈矩形布置,沿压轮轴线方向的长边距离为1090 mm;垂直于压轮轴线方向的短边距离为935 mm。振动时效后压轮的最大残余应力下降明显。
The finite element analysis method is used to simulate the welding process of the pressure roller of a roller, and the residual stress distribution of the pressure roller after welding is obtained. The blind hole method was used to test and evaluate the residual stress before and after vibration aging of the roller, and the simulation results were verified. The results show that the residual stress near the welding position after the pressure roller welding is large with a peak value of 338.6 MPa. The stress at the arc starting position is smaller than the arc closing position, and the residual stress at the intersection of the sealing plate weld and the coil plate welding seam shows a downward trend. The simulation results of residual stress agree well with the experimental results, with an error of 19%, which proves the accuracy of the simulation results. The width of the design support block is 60mm. The 4-point support is rectangularly arranged on the vibration platform with the long edge distance of 1090 mm along the axis of the pressure wheel and the short edge distance of 935 mm perpendicular to the axis of the pressure wheel. After vibration aging pressure roller maximum residual stress decreased significantly.