科研之友
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摘要
In order to solve the folded problem in multi-point forming with symmetric punches (SMPF), a new process of multi-point forming with asymmetric punches (AMPF) is proposed in this paper. Experiment and numerical simulation were both used to elaborately analyze the problem of fold. The deformation behaviors of cylindrical surface, spherical surface, and sail surface in two processes were investigated. The characteristics of shape precision of the sheet metal were obtained under different forming parameters. Then, the stress and strain distribution of the cylindrical surface is obtained by numerical simulations. Finally, the mechanisms of folded generation and suppression were revealed by process analysis. It is shown that the surface quality and the forming precision of the workpiece formed by AMPF are improved by AMPF. Besides, the stress fluctuation during the forming process is obviously reduced and the uniformity of stress and strain after forming is enhanced. In addition, under the same loading condition, the average shape error of the cylindrical surface decreases by 17.6%, the stress extremum difference decreases by 5.7%, and the strain extremum difference decreases by 4.3%. The above research indicates that AMPF has a good application prospect in sheet metal forming.
- 出版日期2017-12
- 单位哈尔滨工业大学
