Transactions of Materials and Heat Treatment

Title：Study on hot extrusion process parameters for deep blind-hole part with large diameter and thick wall based on numerical simulation

Authors： Pang Haiping Yang Xiuqing Zhou Cheng′en Lei Bingwang

Unit： Inner Mongolia North Heavy Industry Group Co. Ltd. Inner Mongolia University of Technology

KeyWords： deep blind-hole hot extrusion folding blind bottom height equivalent strain

ClassificationCode：TG376.2

year,vol(issue):pagenumber：2020,45(8):112-116

Abstract：

For the hot extrusion process of deep blind-hole part with large diameter and thick wall, the axisymmetric FEM models with different sizes of billets and extrusion mold angles were established by finite element software DEFORM-2D, and the extrusion processes with different parameters were simulated and analyzed. The simulation results show that when the blind bottom height is less than 300 mm, the bottom of blind hole is separated from the mandrel prematurely resulting in folding during the extrusion process, and the folding phenomenon is ignored when the blind bottom height is more than 300 mm. Furthermore, the analysis of simulation result revealed the relationship among blind bottom height, extrusion mold angle and solid segment length, and the influences of process parameters on the internal structure of blind holes were analyzed to give the solutions. According to the analysis results, the size and shape of billet as well as main structural parameters of mold were determined, and the simulation results were compared with the actual extrusion results within good agreement. Finally, the distribution of equivalent strain was given to provide a basis for further determination and optimization of hot extrusion process parameters.

Funds：

庞海平（1982-），男，学士，高级工程师，E-mail：1007684373@qq.com；通讯作者：周承恩（1972-），男，博士，副教授，E-mail：zce@imut.edu.cn

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