摘要
A two-pass annealing/quenching internal spinning process with small-end rotations is proposed to form a curved generatrix conical thin-walled shell.That is,annealing at 360°C for 2 h followed by the 1st pass spinning,and finally quenching in ice water after holding for 1 h at 498°C followed by the 2nd pass spinning.ABAQUS finite element software is used to simulate the internal spinning process of the products formed under different forming parameters.The distribution laws of spinning force,the stress and strain under different forming processes were compared and analyzed.The mechanical properties and microstructure of the products are subsequently analyzed.The results show that the strain and the residual stress in the skin area of the formed products under two-pass spinning process more uniform,and the hardness and the mechanical performance are improved.The microstructure of the products formed with the 0.15 mm thickness reduction at the 2nd pass is excellent.And the second phase grain size distributed uniformly in the range of 36μm.Whereas,the second phase particles are broken seriously and the size distribution inhomogeneity is increased when the thickness reduction in the skin area is greater than 0.20 mm at the 2nd pass spinning process.
本文提出大型锥筒形薄壁壳体小端起旋退火/淬火-2道次内旋压成形工艺,即360°C保温2 h毛坯退火-第1道次旋压-498°C保温1 h水淬-第2道次旋压。采用ABAQUS有限元软件对不同工艺参数下的成形过程进行有限元模拟,对比分析不同成形工艺下的旋压力、应力和应变的分布规律,并对旋压制品的力学性能及微观组织进行分析。结果表明:2道次内旋压下成形件的应变和残余应力较均匀,硬度和力学性能得到改善;第2道次成形时蒙皮部分减薄量为0.15 mm时制品的组织性能较好,第二相晶粒尺寸在3~6μm区间内分布均匀,而当蒙皮部分减薄量超过0.20 mm时,容易造成制品的第二相粒子破碎严重,尺寸分布不均匀性增加。
作者
HAO Zeng-liang
YANG Zhe-yi)
WEI Wei
LIU Lei
LUO Jun-ting
LIU Jin-heng
郝增亮;杨哲懿;魏巍;刘磊;骆俊廷;刘金恒(Key Laboratory of Advanced Forging&Stamping Technology and Science of Ministry of Education,Yanshan University,Qinhuangdao 066004,China;State Key Laboratory of Metastable Materials Science and Technology,Yanshan University,Qinhuangdao 066004,China;Hebei Construction Material Vocational and Technical College,Qinhuangdao 066000,China)
基金
Project(51775479)supported by the National Natural Science Foundation of China
Project(E2017203046)supported by the Natural Science Foundation of Hebei Province,China
