Transactions of Materials and Heat Treatment

Title：Influence of die channel intersection angle on equal-diameter angular processing of precursor for ML35 steel high strength fastener

Authors： Zhao Jun Yang Yunliang Zhang Han Zhou Yifan Wen Quanxing Li Xin

Unit： North China Institute of Aerospace Engineering Yanshan University

KeyWords： die channel intersection angle ML35 steel equal-diameter angular processing finite element analysis high strength fastener

ClassificationCode：TG37

year,vol(issue):pagenumber：2019,44(3):72-76

Abstract：

Influences of die channel intersection angle on equal-diameter angular processing load, stress, strain and heat generation of precursor for ML35 steel high strength fastener were studied by combining finite element analysis with experiment. The research results show that the processing load not only makes the material obtain pure shear deformation, but also the part of the load work is converted into heat to make the material warm, the experimental measurement and finite element analysis show that the maximum processing load is 53 kN (die channel external intersection angular φ=30°), the temperature rise area is mainly located at the corner of the die channel (the main deformation zone), the maximum temperature rises to 106 ℃ with the increasing angle φ by 30°, triangular contour in stress field is transformed into approximately parallelogram, and the increase of angle promotes the flowing deformation behavior of materials. However, the strain distribution along the extrusion direction is not change significantly with the increase of angle φ, and all of them are approximately normal distribution characteristics. Thus, the strength of the high strength screw fasteners by equal-diameter angular processing is increased from 559 MPa to 976 MPa without changing the geometric shape approximately.

Funds：

河北省自然科学基金资助项目（E2013409002）；河北省高等学校科学技术研究重点项目（ZD2018239）；北华航天工业学院科研基金重点项目（ZD-2016-03）

赵军（1975-），男，博士，副教授，E-mail：zjqhd@163.com

Reference：

［1］Segal V M, Reznikov V I, Drobyshevskiy A E, et al. Plastic working of metals by simple shear
［J］. Russian Metallurgy, 1981, 1: 99-105.

［2］宋国旸, 穆龙. 等通道转角挤压的工艺特点及应用前景
［J］. 热加工工艺, 2009, 38(21): 117-121.

Song G Y, Mu L. Technological features and application of equal channel angular pressing
［J］. Hot Working Technology, 2009, 38(21): 117-121.

［3］刘锋, 王庆娟, 杜忠泽, 等. ECAP制备超细晶材料组织及其性能的研究进展
［J］. 兵器材料科学与工程, 2013, 36(4): 103-106.

Liu F, Wang Q J, Du Z Z, et al. Research progress in microstructure and property of ultrafine grain materials processed by ECAP
［J］. Ordnance Material Science and Engineering, 2013, 36(4): 103-106.

［4］章震威, 王军丽, 张清龙, 等. 等通道转角挤压制备超细晶材料的研究与发展
［J］. 材料导报, 2017, 31(1): 116-125.

Zhang Z W, Wang J L, Zhang Q L, et al. Producing ultrafine grained materials by equal channel angular pressing: A review
［J］. Materials Review, 2017, 31(1): 116-125.

［5］Iwahashi Y, Wang J，Horita Z. Principle of equal channel angular pressing for the processing of ultrafine grained materials
［J］. Scripta Materialia, 1996, 35: 143-146.

［6］罗文波, 彭炎荣, 罗嘉维. 关于等通道转角挤压应变计算公式的修正
［J］. 塑性工程学报, 2017, 24(5): 141-146.

Luo W B, Peng Y R, Luo J W. Correction about formula of shear strain for equal-channel angular extrusion
［J］. Journal of Plasticity Engineering, 2017, 24(5): 141-146.

［7］王晖云, 何敏, 陈映锟, 等. 模具参数对旋转通道等径角平行挤压工艺的影响
［J］. 锻压技术, 2017, 42(2): 160-166.

Wang H Y, He M, Chen Y K, et al. Influence of die parameters on rotated equal channel angular pressing-parallel channel process
［J］. Forging & Stamping Technology, 2017, 42(2): 160-166.

［8］Agwa M A, Ali M N, Amal E A. Optimum processing parameters for equal channel angular pressing
［J］. Mechanics of Materials, 2016, 100: 1-11.

Service：

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