大型挖掘机起重臂跟脚更换及其焊接变形控制  

Replacement and Welding Deformation in Regulating the Boom Foot on Large Excavator

作　　者：张华俊 卞功波 ZHANG Huajun;BIAN Gongbo(Taiyuan Heavy Industry Co.,Ltd.,Taiyuan 030024,China;School of Taiyuan University of Technology Materials Science and Engineering,Taiyuan 030024,China)

机构地区：[1]太原重工矿山设备分公司,山西太原030024 [2]太原理工大学材料科学工程学院,山西太原030024

出　　处：《电焊机》2023年第11期101-106,共6页Electric Welding Machine

基　　金：国家自然科学基金面上项目(52075360)。

摘　　要：阐述了在矿山现场恶劣工况条件下如何更换大型挖掘机单侧的起重臂跟脚,以及焊接变形的控制。采用有限元分析,重点评估起重臂跟脚的焊接变形量,并借助工艺假轴,焊接残余应力和变形有一定的改善。销孔周围的焊接变形,在考虑工艺假轴后,最大变形量从0.13 mm降低为0.11 mm,并且变形位置远离销孔中心。本项工作对后续涉及其他重型机械主要零部件的修复也具有重要参考意义,能有效提升挖掘机的工作效率和稳定性,进一步降低设备故障率和运营成本,以满足矿山生产的需求。This article delineates the methodology to replace the heel of the single-side boom of a large excavator and the regulation of welding deformation within the rigorous working conditions of the mine site.The welding deformation of the boom foot is calculated by finite element analysis,and the post-weld deformation is efficiently mitigated by the implementa‐tion of the dummy shaft,revealing that the maximum deformation near the heel is 0.11 millimeters.This work not only guar‐antees the welding quality,but also efficaciously controls the welding deformation,thereby assuring the matching size be‐tween the boom and the slewing platform,prolonging the service life of the boom and saving costs..In addition,the research results of this paper have a pertinent influence on the subsequent rectification of other major components of heavy machin‐ery.This investigation furnishes robust backing for enhancing the operational efficiency and stability of the excavator,fur‐ther curtailing the equipment failure rate and operating expenditure,and accommodating the needs of mine production.

关 键 词：挖掘机 起重臂跟脚 焊接工艺 变形控制 焊接有限元 

分 类 号：TG4[金属学及工艺—焊接]