GH536高温合金帽罩翻边成形应力应变数值分析  

Numerical analysis of stress and strain during flanging forming for GH536 superalloy cap

作　　者：蔡晋[1] 杨明[1] 李炆芮 杨踊 石晓东 CAI Jin;YANG Ming;LI Wen-rui;YANG Yong;SHI Xiao-dong(College of Aerospace Engineering,Shenyang Aerospace University,Shenyang 110136,China;Sheet Welding Branch Factory,AECC Shenyang Liming Aero Engine Co.,Ltd.,Shenyang 110043,China)

机构地区：[1]沈阳航空航天大学航空宇航学院,沈阳110136 [2]中国航发沈阳黎明航空发动机有限责任公司钣焊加工厂,沈阳110043

出　　处：《沈阳航空航天大学学报》2022年第2期39-45,共7页Journal of Shenyang Aerospace University

基　　金：中国航发产学研合作项目(项目编号:HFZL2019CXY024-1)。

摘　　要：针对GH536高温合金燃烧室帽罩翻边成形难度大、应力应变分布难以控制等问题,进行翻边成形仿真研究。根据凸模进给速度及摩擦因素的不同,建立3组翻边成形有限元模型,探究凸模进给速度及摩擦因素对GH536高温合金帽罩翻边成形应力及塑性应变分布的影响。结果显示,凸模进给速度过高,环形凸起与翻边异形孔连接区域产生较高的应力场均值,帽罩环形凸起区域在异形孔相接区域产生较大的扩孔变形,异形孔间塑性应变较高,变形程度较高,异形孔翻边成形不明显。接触摩擦系数的提高,使异形孔区域周边产生较高的切应力,导致异形孔前缘处于过高的应力状态,引发局部区域产生褶皱等变形;降低凸模进给速度及摩擦系数可以使应力及应变分布呈下降趋势,变形不均情况减少,翻边成形质量提高。In view of great difficulties of flanging forming and controlling stress and strain distribution for a combustion chamber cap made of GH536,simulation research of the flanging forming was carried out.According to different punch feed rates and friction factors,three groups of finite element models were established to study effects of the punch feed speed and friction factor on stress and plastic strain distribution during flanging forming of the cap.Results show that when the punch feed rate was too high,connections area of annular convex and flanging hole had a higher average stress field,ring bulge area of the cap in the connection area of shaped hole produced larger hole expansion deformation.Plastic strain of the shaped hole was higher,distortion degree of deformation was greater,which in turn flanging of the shaped hole was not obvious.Increase of the contact friction coefficient led to higher shear stress around the shaped hole,resulting in a remarkable increase of stress in front edge of the hole,which further induced appearance of the distortion such as wrinkles in local area.Decrease of the punch feed speed and the friction coefficient could alleviate stress and strain distribution,reducing disproportion of the deformation and improving quality of the flanging forming.

关 键 词：翻边成形 高温镍基合金 应力 塑性应变 有限元 

分 类 号：V261[航空宇航科学与技术—航空宇航制造工程]