薄壁多腔挤压件的充液镦压校形工艺  

Hydro-forging correction process on thin-walled extrusion part with multi-cavity

作　　者：孙磊 林才渊 郭晓琳[3] 初冠南[1,2] Sun Lei;Lin Caiyuan;Guo Xiaolin;Chu Guannan(School of Materials Science and Engineering,Harbin Institute of Technology(Weihai),Weihai 264209,China;Harbin Institute of Technology-Weihai Innovation Park Co.,Ltd.,Weihai 264209,China;Beijing Hangxing Machinery Manufacturing Co.,Ltd.,Beijing 100013,China)

机构地区：[1]哈尔滨工业大学(威海)材料科学与工程学院,山东威海264209 [2]哈工大(威海)创新创业园有限责任公司,山东威海264209 [3]北京航星机器制造公司,北京100013

出　　处：《锻压技术》2021年第4期50-55,共6页Forging & Stamping Technology

基　　金：国家基金委航天联合基金重点项目(U1937205);国家自然基金面上项目(51475121);山东省重大科技创新工程(2019TSLH0103)。

摘　　要：为了减小甚至消除薄壁多腔构件经热加工后的变形,提出了一种新的充液镦压校形工艺。其核心思想为在内压支撑下通过轴向压缩变形改变零件截面的应力分布来提高形状精度。为了验证该工艺的可行性,以6005-T6铝合金薄壁多腔热挤压件为研究对象,进行充液镦压校形有限元模拟和实验验证。结果表明:充液镦压校形工艺可以有效减少试验件在热加工后的变形、提高其形状精度。当内压为10 MPa、压缩量为12 mm时,充液镦压获得的试验件形状与所需形状完全一致。同时,内压卸载前后位移的分布结果显示,试验件压缩变形后的位移分布变化较小,说明卸载后回弹较小,满足设计要求。To reduce or even eliminate the deformation of thin-walled extrusion part with multi-cavity after hot forming process,a new hydro-forging correction process was proposed,and the core idea was that the stress distribution of part was changed by axial compression deformation under the supporting of internal pressure to improve the shape accuracy.For 6005-T6 aluminum alloy thin-walled extrusion part with multi-cavity,the experiments and finite element simulation of hydro-forging correction process were conducted to verify its feasibility.The results show that the deformation of part after hot forming is significantly decreased,and the shape accuracy is improved by the hydro-forging correction process.When the internal pressure of 10 MPa and the compression amount of 12 mm are used,the shape of part obtained by the hydro-forging correction process is consistent with the desired shape.Furthermore,the results of displacement distribution before and after unloading show that the change of displacement distribution is little after compression deformation of part,indicating that the springback of part after unloading is small and meets the design requirements.

关 键 词：薄壁多腔挤压件 充液镦压 形状精度 校形 铝合金 

分 类 号：TG39[金属学及工艺—金属压力加工]