冷镦钢M6平头螺丝成型过程热-力耦合数值模拟研究

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Abstract In this paper, the coupled thermal-mechanical finite element (FE) models have been built for the analysis of the cold drawing and heading processes of an M6 flat head steel screw (grade SWRCH15A). Detailed analysis of the stress, equivalent plastic strain, temperature, shape and size of the workpiece processed from the third pass of cold drawing through to the following 3-stage cold heading processes has been carried out. It is shown that the maximum equivalent stress is found in the center of the cold drawn wire, whereas the maximum equivalent plastic strain is about 0.5mm below the surface. In the second and third cold heading process, the surface layer on the edge of the screw head endures large hoop tensile stress, which is believed to be the main cause for the likelihood of axial cracking in that region. From the cold drawing to the cold heading process, the maximum equivalent plastic strain of the workpiece increases linearly and the maximum internal temperature of the workpiece can reach 269.4 ℃. The simulation results of the shape and size of the workpiece from the cold heading processes are very close to reality, which demonstrates that the coupled thermo-mechanical FE models constructed for the cold drawing and screw forming analysis are accurate and reliable.

Key words： cold heading steel screw forming finite element thermo-mechanical coupling cold heading cracking

Published: 08 January 2021

CLC number:	TB31
	TH16

Fund:This work was financially supported by the Guangdong Innovative and Entrepreneurial Research Team Program (2016ZT06G025) and Guangdong Natural Science Foundation (2017B030306014).

About author:: Zhuozhi Fan is assistant researcher of CEAM (Centre of Excellent for Advanced Materials). He received his master's degree in materials science in Kunming University of Science and Technology in 2013. Since graduation, he has devoted in numerical modeling and mate-rials. He has published more than 10 journal papers until now. He was selected for “talent training program of scientific and technological innovation of Dongguan” in 2019. Shuyan Zhang obtained her doctor's degree from University of Oxford. She is a professor and Ph.D Supervisor. Now, she is director of Center of Excellence for Advanced Materials (CEAM). Her team was selected as “The Introduced Innovative and Entrepreneurial Team” by Pearl River Talent Recruitment Program of Guangdong and she was awarded “Distinguished Young Scientist” by Guangdong Natural Science Foundation. She used to serve as Principal Scientist at ISIS Neutron and Muon Source (ISIS) and Member of the Science & Technology Advisory Board of both ISIS and European Spallation Source (ESS). She now works part-time as Senior Visiting Scientist at the Science & Technology Facilities Council (STFC), Visiting Professor at The Open University, Member of Technical Committee of Doctoral Research Center for Creative Metal Treatment in the UK, Accreditation Member for Japan Spallation Neutron Source (J-PARC), Member of MECA SENS International Science & Technology Ad- visory Board and Editor of The European Physical Journal Plus. Her research interest includes the analysis of residual stress, study of micro mecha-nical properties and structural integrity of engineering materials and components, and three-dimensional analysis of stress in materials and large components using neutron diffraction and X-ray diffraction. Besides, she has led projects on scientific research and engineering application funded by National Natural Science Foundation of China, Engineering and Physical Sciences Research Council and STFC in the UK, and by world-renowned companies like Rolls-Royce, Tata Steel and AREVA. She has published over 100 papers in international journals, and co-compiled Materials today: Proceedings. She also contributes to the establishment of ISO standard “Non-destructive Measurement—the Standard Method to Determine Residual Stress Using Neutron Diffraction” and EU standard “The Standardization of the Application of Neutron Technology in Structural Integrity”.

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	FAN Zhuozhi
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	WEN Shuwen
	XIANG Ming
	LIN Yanmin
	ZHANG Zhiming
	ZHONG Shoujun
	WANG Qingsong

Cite this article:

FAN Zhuozhi,ZHANG Shuyan,WEN Shuwen, et al. Coupled Thermo-mechanical Modelling Analysis of the Cold Drawing and Heading Processes of an M6 Flat Head Steel Screw[J]. Materials Reports, 2020, 34(Z2): 399-406.

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http://www.mater-rep.com/EN/ OR http://www.mater-rep.com/EN/Y2020/V34/IZ2/399

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