The Modelling of the Mechanics of Deformation in Plane Strain Upsetting of Round Cross-Section Billets Between the Flat and V-Shaped Dies

Subject Areas : Mechanics of Solids

M Maleki ¹ , H Haghighat ²

1 - Mechanical Engineering Department, Razi University, Kermanshah, Iran
2 - Mechanical Engineering Department, Razi University, Kermanshah, Iran

Received: 2022-07-23 Accepted : 2022-09-26 Published : 2022-12-01

Keywords: Slab Method, Forming load, Plane strain upsetting, Deformation model,

Abstract :

Plane strain upsetting of round cross-section billets between the flat and V-shaped dies has been studied in this paper. A deformation model has been proposed and the geometry of the deformed billet cross-section is determined for a given displacement of the top flat die. To analyze the process, the slab method of analysis has been applied and for a given process conditions, the required forming load has been estimated. The process under consideration has been performed also with the finite-element method to predict the forming load and the material flow. The calculated forming load and the deformed billet cross-section geometry compare well with the FE simulations data. The effects of friction factor and the angle of the V-shaped bottom die on the forming load have been investigated. The theoretical results have been indicated that as the bottom die angle decreases the forming load decreases and the forming load is not influenced by friction in case of small bottom die angles.

References:

1. Oleg E.M., Alexander V.P., Marina A.M., Vitalii N.Z., 2015, Development of a new process for forging plates using intensive plastic deformation, International Journal of Advanced Manufacturing Technology 83: 2159-2174.


2. Nasmyth J., 1950, Improvements in forging iron, Journal of the Franklin Institute 50: 404-408.


3. Johnson W., 1958, Indentation and forging and action of Nasmyth's Anvil, Engineer 205: 348-350.


4. Keife H., Stahlberg U., 1980, Influence of pressure on the closure of voids during plastic deformation, Journal of Mechanical Working Technology 4: 133-143.


5. Stahlberg U., Keife H., Lundberg M., Melander A., 1980, A study of void closure during plastic deformation, Journal of Mechanical Working Technology 4: 51-63.


6. Vilotic D., Shabaik A.H., 1985, Analysis of upsetting with profiles dies, Transactions of ASME Journal of Engineering Materials Technology 107: 261-264.


7. Dudra S.P., Im Y.T., 1990, Analysis of void closure in open-die forging, International journal of Machine Tools and Manufacture 30: 65-75.


8. Dudra S.P., Im Y.T., 1990, Investigation of metal flow in open-die forging with different die and billet geometries, Journal of Materials Processing Technology 21: 143-154.


9. Lin S.Y., 2002, Stress analysis of upsetting with concave curve dies, Journal of Materials Processing Technology 123: 36-44.


10. Choi S.K., Chun M.S., Van Tyne C.J., Moon Y.H., 2006, Optimization of open die forging of round shapes using FEM analysis, Journal of Materials Processing Technology 172: 88-95.


11. Alexandrov S., Yusof M., 2009, An analysis of continued plane strain compression by the upper bound method, ICCES 10: 11-23.


12. Christiansen P., Hattel J.H., Kotas P., Laszlo V. , 2012, Modelling the void deformation and closure by hot forging of ingot castings, International Conference on Ingot Casting, Rolling and Forging Technology, Aachen, Germany.


13. Banaszek G., Bajor T., Kawałek A., Garstka T., 2020, Analysis of the open die forging process of the AZ91 Magnesium alloy, Materials 13: 3873.