Transactions of Materials and Heat Treatment

Title：Application of autofrettage theory in the design of linear strengthening material combined die

Authors： Yang Fengyu Hu Chengliang Zhao Zhen Liao Xiping Wu Guohong

Unit： Shanghai Jiaotong University Dongguanshi Hengli Tooling Science and Technology Industry Co. Ltd.

KeyWords： autofrettage combined die residual stress linear hardening

ClassificationCode：TG316

year,vol(issue):pagenumber：2016,41(6):78-82

Abstract：

In order to improve the elastic limit and fatigue life of combined die, the double layer combined die was designed based on the autofrettage theory, and its autofrettage process based on the linear hardening material model was theoretically analyzed. Then, the simulation calculation was carried out by finite element software Msc.Marc, and the calculated result agreed with the theoretical calculation result. Furthermore, the influence of different coefficients of strain-hardening modulus on the autofrettage effect was analyzed. The result shows that the circumferential residual stress at the internal boundary of die insert obviously decreases with the increase of the coefficient of strain-hardening modulus. Furthermore, comparing with traditional combined die, the circumferential residual stress at the internal boundary is improved remarkably, the risk of cracking on the internal surface of die is reduced significantly.

Funds：

基金项目:国家自然科学基金资助项目（51475294）

作者简介：杨丰钰（1991-），男，硕士研究生 E-mail：yangfy1991@sjtu.edu.cn 通讯作者：胡成亮（1980-），男，博士，副教授 E-mail：clhu@sjtu.edu.cn

Reference：

［1］Majzoobi G H, Farrahi G H, Mahmoudi A H. A finite element simulation and an experimental study of autofrettage for strain hardened thick-walled cylinders [J]. Materials Science and Engineering: A, 2003, 359 (1): 326-331.

［2］郑小涛, 轩福贞. 热—机载荷下厚壁圆筒自增强压力与安全性分析 [J]. 机械工程学报, 2010, 46 (16): 156-161.Zheng X T, Xuan F Z. Investigation on autofrettage and safety of the thick-walled cylinder under thermo-mechanical loadings [J]. Journal of Mechanical Engineering, 2010, 46 (16): 156-161.

［3］张于贤. 超高压容器中的自增强理论的研究及应用 [D]. 重庆: 重庆大学, 2005.Zhang Y X. The Research and Using of Autofrettage Theory in Super High Pressure Vessel [D]. Chongqing: Chongqing University, 2005.

［4］杨长顺. 冷挤压模具设计 [M]. 北京: 国防工业出版社, 1994.Yang C S. Die Design for Cold Extrusion [M]. Beijing: National Defense Industry Press, 1994.

［5］Yang Q H, Chen X, Meng B, et al. Optimum design of combined cold extrusion die for bevel gear [J]. International Journal of Engineering and Technology, 2012, 4 (4): 348-351.

［6］Joun M S, Lee M C, Park J M. Finite element analysis of prestressed die set in cold forging [J]. International Journal of Machine Tools and Manufacture, 2002, 42 (11): 1213-1222.

［7］Hur K D, Choi Y, Yeo H T. Design for stiffness reinforcement in backward extrusion die [J]. Journal of Materials Processing Technology, 2002, 130: 411-415.

［8］赵雅丽. 基于小弹塑性变形的冷挤压凹模结构优化设计 [D]. 合肥: 合肥工业大学, 2009.Zhao Y L. Structural Optimization Design of Cold Extrusion Die Based on Small Elastic-plastic Deformation [D]. Hefei: Hefei University of Technology, 2009.

［9］钱凌云, 刘全坤, 韩豫, 等. 基于双线性强化模型的挤压凹模自增强技术研究 [J]. 机械工程学报, 2011, 47 (12): 26-31.Qian L Y, Liu Q K, Han Y, et al. Research on autofrettage technology for extrusion die based on bilinear hardening model [J]. Journal of Mechanical Engineering, 2011, 47 (12): 26-31.

［10］钱凌云. 冷挤压凹模结构设计和优化方法的研究 [D]. 合肥: 合肥工业大学, 2012.Qian L Y. Research on Structure Design and Optimization Method of Cold Extrusion Die [D]. Hefei: Hefei University of Technology, 2012.

［11］徐秉业, 刘信声. 应用弹塑性力学[M]. 北京: 清华大学出版社, 1995.Xu B Y, Liu X S. Applied Elastic-plastic Mechanics [M]. Beijing: Tsinghua University Press, 1995.

［12］只悦胜. 精锻成形组合凹模热弹性变形规律研究 [D]. 上海: 上海交通大学, 2013.Zhi Y S. Study on Thermo-elastic Deformation of Combined Die in Precision Forging [D]. Shanghai: Shanghai Jiao Tong University, 2013.

Service：

【This site has not yet opened Download Service】【Add Favorite】