基于有限元的模具结构对AZ91镁合金管转角分流挤压焊合压力的影响  

Influence of mold structure on welding pressure in angular porthole extrusion for AZ91 magnesium alloy pipe based on FEM

作　　者：党利[1] 李云帆[2] 王蕊[3] 单晨晨 马遥力 马胜龙[2] Dang Li;Li Yunfan;Wang Rui;Shan Chenchen;Ma Yaoli;Ma Shenglong(School of Aeronautics Engine,Zhengzhou University of Aeronautics,Zhengzhou 450046,China;School of Modern Information Technology,Henan Vocational Technology College,Zhengzhou 450046,China;School of Electronics and Internet,Henan Vocational Technology College,Zhengzhou 450046,China)

机构地区：[1]郑州航空工业管理学院航空发动机学院,河南郑州450046 [2]河南职业技术学院现代信息技术学院,河南郑州450046 [3]河南职业技术学院电子与物联网学院,河南郑州450046

出　　处：《锻压技术》2022年第3期89-95,115,共8页Forging & Stamping Technology

基　　金：河南省科技攻关项目(212102210450);郑州航院校级教改项目(zhjy21-(01-100))。

摘　　要：将转角挤压剪切变形原理和镁合金管材分流挤压相结合,设计了镁合金管转角焊合室分流挤压模具。新模具在保证挤压舌针刚度的前提下增加了焊合室的有效高度和焊合时间,从而有利于提高焊缝的焊合性能。基于DEFORM有限元平台建立了AZ91镁合金管转角焊合室分流挤压有限元模型,并进行了可靠性验证。然后,基于该有限元模型研究了转角角度、分流桥结构和凹模结构尺寸对焊合室内平均压应力的影响规律。结果表明:随着分流模转角β和凹模结构尺寸a的增大,焊合室内的平均压应力逐渐增加;对于雨滴形分流桥结构,随着分流桥锥度γ的增大,焊合室内的平均压应力有所增大,但是增幅不明显。The porthole extrusion mold for angular welding chamber of magnesium alloy pipe was designed by combining the shear deformation principle of angular extrusion with porthole extrusion of magnesium alloy pipe,and the new mold increased the effective height of the welding chamber and the welding time under the premise of ensuring the rigidity of extrusion needle,which was beneficial to improve the welding performance of welding seam.Then,the finite element model of porthole extrusion for the angular welding chamber of AZ91 magnesium alloy pipe was developed based on DEFORM finite element platform,and its reliability was verified.Furthermore,the influence laws of rotation angle,porthole bridge structure and die structure size on the average compressive stress in the welding chamber were revealed based the finite element model.The results show that the average compressive stress in the welding chamber increases gradually with the increasing of rotation angleβof porthole mold and die structure size a.For the raindrop-shaped porthole bridge structure,with the increasing of porthole bridge taperγ,the average compressive stress in the welding chamber increases,but the increase is not obvious.

关 键 词：镁合金管 分流挤压 转角焊合室 模具结构 焊合压应力 

分 类 号：TG319[金属学及工艺—金属压力加工]