摘要
某型号双机机架外形尺寸大,结构刚性大,材料焊接性差,焊缝密集区的焊接应力与变形易在焊缝及形位边缘得到放大,从而产生裂纹和较大焊接变形。通过对机架的材料、结构、焊缝分布、焊接变形以及设计技术要求进行分析,制定了焊前、焊后处理方法,降低焊缝冷却速度,减小焊接淬硬倾向;设计专用的装配焊接工装,制定合理焊接顺序,限制了零件焊接变形。机架焊缝经吹砂煤油试验检查,未发现任何裂纹,外形尺寸满足设计要求,抽样的机架通过了静力试验考核。
The external dimension of a double machine frame was large,the structural rigidity was large,and the material weldability was poor.The welding stress and deformation in the dense weld area were easy to be amplified in the weld and shape edge,resulting in cracks and large welding deformation.By analyzing the material,structure,weld distribution,welding deformation and design technical requirements of the frame,the pre-welding and post-welding treatment methods were formulated to reduce the cooling rate of the weld and the tendency of welding hardening.The welding deformation of the parts was limited by designing special assembly and welding tooling,and developing a reasonable welding order.Through sand blasting kerosene test,no cracks were found on the welds of the frame,the overall dimensions meet the design requirements,and the sampled frame had passed the static test.
作者
高凤林
陈志凯
杨海鑫
孔兆财
邹鹤飞
马铁铮
李文武
Gao Fenglin;Chen Zhikai;Yang Haixin;Kong Zhaocai;Zou Hefei;Ma Tiezheng;Li Wenwu(Capital Aerospace Machinery Co.,Ltd.,Beijing 100076)
出处
《航天制造技术》
2021年第6期1-4,30,共5页
Aerospace Manufacturing Technology
关键词
双机机架
裂纹
焊接应力
焊接变形
double machine frame
crack
welding stress
welding deformation
作者简介
高凤林(1962),特级技师,首席技能专家,研究方向:焊接技术工艺应用与实践。
