Deformation behavior of saddle surface part during multi-point forming under normally full constraint condition
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In order to solve the problem of wrinkling in traditional multi-point forming (MPF), a new multi-point forming process, namely multi-point forming with individually controlled force-displacement (MPF-ICFD), was proposed. The core idea of this process is to impose a full-area normal constraint on the sheet metal during the whole forming process. Therefore, the deformation sequence of the sheet metal is changed from the local constraint and the whole deformation in the traditional MPF to the whole constraint and the local deformation so as to completely eliminate the noncontact region and avoid wrinkling. In this paper, the saddle surface part was taken as the research object. The influence of normal restraint on critical wrinkle stress is studied by mechanical analysis, and the wrinkle restraint mechanism under normal restraint is revealed. The deformation behavior of saddle surface parts was studied by forming experiments, and the wrinkling law of saddle surface parts under different constraints is obtained. The deformation characteristics of saddle surface parts were analyzed by numerical simulation, and the critical stress distribution rules of the sheet metal were given. It is shown that the critical wrinkling stress of the sheet metal is significantly increased in MPF-ICFD compared with that in traditional MPF, and the increased value is proportional to the magnitude of normal constrained force. Besides, the wrinkling phenomenon of saddle surface parts is significantly suppressed, and the surface quality of workpiece is obviously improved. In addition, the stress state change from compressive stress to tensile stress in the core region of the sheet metal was prone to wrinkle.
KeywordsMulti-point forming Normal constraint Wrinkling Saddle surface part
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This research is supported by the National Natural Science Foundation of China (No. 51505103, No. 51175109).
- 2.Wang XY, Jin JS, Deng L (2017) Review: state of the art of stamping forging process with sheet metal blank. J Harbin Inst Technol 24(3):1–16Google Scholar
- 3.Hatipoğlu HA, Alkaş CO (2016) Process modelling and die design concepts for forming aircraft sheet parts. J Phys Conf Ser:1–4Google Scholar
- 6.Peng JW, Li WD, Han JQ, Wan M, Meng B (2016) Kinetic locus design for longitudinal stretch forming of aircraft skin components. Int J Adv Manuf Technol 86(9–12):1–12Google Scholar
- 8.Zareh DB, Davoodi B, Vedaei SA (2015) Investigation of deep drawing concept of multi-point forming process in terms of prevalent defects. Int J Mater Form:1–11Google Scholar
- 9.Belykh S, Krivenok A, Bormotin K, Stankevich A, Krupskiy R, Mishagin V, Burenin A. Numerical and experimental study of multi-point forming of thick double curvature plates from aluminum alloy 7075. IV Sino Russian ASRTU Symposium on Advanced Materials and Processing Technology, 2016: 17–23Google Scholar
- 10.Toopkanloo R, Kaffash MM, Ghorbani M (2016) Assessment of forming parameters effects on quality of the multi point forming process of ST-AH32. National Conference on Mechanical Engineering and Industrial Solutions:60–66Google Scholar
- 15.Qu E, Li M, Li R, Zhao L, Zhuo Y (2017) Inhibitory effects of a flexible steel pad on wrinkling in multi-point die forming. Int J Adv Manuf Technol 10:1–8Google Scholar