期刊
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
卷 213, 期 6, 页码 987-996出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jmatprotec.2012.12.002
关键词
Radial forging; Swaging; TCTAIG; Tube sinking; Finite element simulation
资金
- National Natural Science Foundation of China [50975096, 51175186]
- Guangdong Provincial Natural Science Foundation of China [S2011010002225]
- Fundamental Research Funds for the Central Universities of China [2012ZZ0053]
- Guangdong Provincial Science and Technology Planning Project of China
The current work presents a simulation and experimental study on the formation characteristics of sinking thin-walled copper tube with axially inner micro grooves (TCTAIG) through radial forging. A finite element (FE) model is established. The deformation of grooves, distribution of equivalent stress and strain, and the effects of process parameters are analyzed using a FE software. Experiments with the same parameter settings are compared with the simulations. The axial elongation and radial shrinkage of TCTAIG can be obtained. The grooves are twisted as helical lines in the sinking zone. The metal flows axially and tangentially. The maximal equivalent stress and strain occur at the bottom of the grooves. The equivalent strain increases as the step increases, and finally stays at a certain value: bottom of grooves, 0.9; outer surface, 0.8; and top of teeth, 0.3. The equivalent strain becomes more uniform, the force of dies reduces, and the elongation ratio decreases with increasing feed speed. The equivalent stress, force of dies, and axial pushing force increases rapidly with increasing shrinkage rate. Apparent collapse occurs and the surface quality of the forged part becomes worse at a low feed speed or a shrinkage rate of 50%. (C) 2012 Elsevier B.V. All rights reserved.
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