液压支架立柱底缸焊接残余应力研究  

Research on Welding Residual Stress of Column Bottom Cylinder in Hydraulic Support

作　　者：张继业 范俊锴[2] Zhang Jiye;Fan Junkai(Zhengzhou Coal Mining Machinery(Group)Co.,Ltd.,Zhengzhou 450017,China;School of Mechanical and Power Engineering,Henan Polytechnic University,Jiaozuo 454000,China)

机构地区：[1]郑州煤矿机械集团股份有限公司,郑州450017 [2]河南理工大学机械与动力工程学院,河南焦作454000

出　　处：《煤矿机械》2021年第6期94-97,共4页Coal Mine Machinery

基　　金：河南省高等学校重点科研项目(19A460003)。

摘　　要：以φ500 mm双伸缩立柱为研究对象,采用有限单元法模拟分析现有焊接工艺下的缸筒缸底焊缝残余应力和局部变形特征。研究结果表明,焊接完成以后,在焊缝内部形成了较大的残余应力,且应力在各个道次焊缝内部产生剧烈的波动;各个焊接道次最大应力均集中在其边缘位置,且应力在拉应力和压应力之间产生剧烈的波动;焊接残余应力的这种高幅值波动特征极易和外部应力耦合,导致微裂纹的产生,进而导致整个焊接结构的失效。Taking the φ500 mm double telescopic column as the research object, finite element method was used to simulate and analyze the residual stress and local deformation characteristics of cylinder bottom weld under the existing welding process. The results show that after welding, a large residual stress was formed in the weld, and the stress fluctuates violently in each pass. The maximum stress of each welding pass was concentrated at its edge, and the stress fluctuates violently between tensile stress and compressive stress. The high amplitude fluctuation of welding residual stress is easily coupled with external stress, which leads to the generation of microcracks and the failure of the whole welding structure.

关 键 词：残余应力 焊接 缸筒底座 立柱 液压支架 

分 类 号：TD355.4[矿业工程—矿井建设]