Computational analysis of contact forces influence on cold forming processes in the dies with complex surfaces

4th ModTech International Conference - Modern Technologies in Industrial Engineering

Dragnea, D.^1 ; Lixandru, P.^1 ; Chereches, T.^1 ; Velicu, St.^2

SC UPS PILOT ARM SRL, Dragomiresti

137210, Romania^1

Polytechnic University of Bucharest, IMST Faculty, Splaiul Independentei 313, sector 6, Corp CD 003, Bucharest

060042, Romania^2

关键词: Cold forming process;    Computational analysis;    Friction coefficients;    Frictional forces;    Interaction forces;    Internal structure;    Mechanical action;    Numerical simulation method;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/145/2/022011/pdf
DOI  :  10.1088/1757-899X/145/2/022011

来源: IOP

【 摘 要 】

Interaction forces between the workpiece and the die appear during the cold forming process of metals in dies. Surface forces of high-intensity influence the mesh structure and internal structure of the finished piece by mechanical action. Frictional forces hinder the flow of the material in contact with the die walls, especially on surfaces of complex shape. Under certain conditions, the material can adhere to the wall of the die, leading to the blocking of the cold forming process. In order to highlight the influence of contact forces on cold forming processes in dies with complex surfaces there were used numerical simulation methods with finite elements. Numerical simulations of the process of axial cold forming in the die were carried out for analysis data acquisition necessary, in order to achieve HTD pulleys, for an ordinary range of friction coefficients. The analysis was directed to the gearing area of the HTD pulleys (head, flank and base of the tooth). The analysis highlighted the negative effects of friction forces on the shape and quality of the products and the need to use quality lubricants. Also, using the cold forming process they can be achieved substantial savings by redistribution of the material without removing it.