期刊
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
卷 210, 期 15, 页码 2273-2284出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jmatprotec.2010.08.021
关键词
Friction role; Friction test; Tube bending; Bending deformation; Small bending radii
资金
- National Natural Science Foundation of China [59975076, 50905144]
- National Science Found of China for Distinguished Young Scholars [50225518]
- State Key Laboratory of Materials Processing and Die & Mould Technology [09-10]
- NPU Foundation for Fundamental Research [JC201028]
For contact dominated rotary-draw-bending (RDB) of thin-walled tube, friction role should be focused to achieve precision bending under small bending radii ratio (R-d/D < 2.0, R-d-bending radius, D-tube diameter). By using explicit FE simulation combined with physical experiment, underlying effects of the friction on bending behaviors are explored from multiple aspects such as wrinkling, wall thickness variation and cross-section deformation. The results show that: (1) By using a simulative twist compression test (TCT), the dynamic contact conditions of ROB with large slipping are reproduced, and the coefficients of the friction (CoFs) under various tribological conditions in RDB are estimated, which provides physical basis for understanding friction role and boundary conditions for FE simulation. (2) Both positive and negative effects of friction role are observed since the friction on each interface affects the multi-defect with different or even contrary tendencies. The effect sensitivity on wrinkling is less obvious than that on wall thinning and cross-section deformation. Under smaller R-d/D, the bending becomes more sensitive to the friction conditions. (3) Considering the knowledge about friction role on individual interface of RDB. by changing two decisive parameters affecting the CoFs such as lubricant types and tube/tool materials, an optimal strategy is proposed to apply the tribological conditions and thus the stable and accurate bending conditions are established for precision forming of RDB under smaller R-d/D. (C) 2010 Elsevier B.V. All rights reserved.
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