吉林大学学报(工学版) ›› 2013, Vol. 43 ›› Issue (06): 1536-1540.doi: 10.7964/jdxbgxb201306017

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Influence factors on dimpling in multi-point thermoforming for polymer sheet

CAO Jun-hui, FU Wen-zhi, LI Ming-zhe, PENG He-li   

  1. Dieless Forming Technology Center, Jilin University, Changchun 130022, China
  • Received:2013-04-01 Online:2013-11-01 Published:2013-11-01

Abstract:

Multi-point Thermoforming (MPTF) is a new flexible technique for forming three-dimensional polymer sheet parts. The parameters of polycarbonate according to G'Sell's constitutive equation were determined and a Finite Element Model(FEM) of MPTF process of polymer sheet was established. A series of numerical simulations were carried out to analyze the influence factors on dimpling in MPTF. The results show that the dimples on the formed part diminish with the decrease of punch element size. The large punch element radius can improve the surface quality and the shape accuracy of the formed part. Experiments were performed on a MPTF experimental setup and the results show that proper selection of the dimension of multi-point die can significantly improve the forming quality.

Key words: material synthesis and processing technology, multi-point forming, thermoforming, polymer sheet, flexible forming

CLC Number: 

  • TQ320

[1] 李明哲,中村敬一,渡辺忍,等.基本的な成形原理の检讨(板材多点成形法の研究第1报)//日本平成4年度塑性加工春季讲演会论文集,横滨,1992:519-522. Li Ming-zhe, Nakamura K, Watanabe S, et al. Study of the basic principles(1st report: Research on multi-point forming for sheet metal)//Proc of the Japanese Spring Conf for Technology of Plasticity, Yokohama, 1992:519-522.

[2] Li M Z, Cai Z Y, Sui Z, et al. Multi-point forming technology for sheet metal[J]. Journal Material Processing Technology, 2002, 129(1-3): 333-338.

[3] 申长雨,陈静波,刘春太,等. 塑料热成型技术[J]. 工程塑料应用, 2000,28 (1):37-41. Shen Chang-yu, Chen Jing-bo,Liu Chun-tai, et al. Thermoforming of plastics[J]. Engineering Plastics Application, 2000, 28 (1):37-41.

[4] 蔡中义,李明哲,付文智. 板材多点成形中压痕缺陷的分析与控制[J]. 锻压技术, 2003, 28(1): 16-19. Cai Zhong-yi,Li Ming-zhe,Fu Wen-zhi.Analysis and control of dimpling in multi-point forming for sheet meta[J].Forging & Stamping Technology,2003,28(1):16-19.

[5] 孙刚, 李明哲, 蔡中义, 等. 多点成形时工艺方式对工件压痕的关系研究[J]. 材料科学与工艺, 2004, 12(4):360-363. Sun Gang, Li Ming-zhe, Cai Zhong-yi, et al. Study on the relationship of technology modes and dimple of sheet metal parts in multi-point forming[J]. Materials Sinence & Technology, 2004, 12 (4): 360-363.

[6] Cai Zhong-yi, Wang Shao-hui, Li Ming-zhe. Numerical investigation of multi-point forming process for sheet metal: wrinkling, dimpling and springback[J]. Inernational Journal of Advanced Manufacturing Technology,2008, 37(9-10): 927-936.

[7] Liu Qi-qian, Lu Cheng, Fu Wen-zhi, et al. Optimization of cushion conditions in micro multi-point sheet forming[J]. Journal of Materials Processing Technology, 2012, 212(3): 672-677.

[8] G'sell C, Jonas J. Determination of the plastic behaviour of solid polymers at constant true strain rate[J]. Journal of Material Science, 1979, 14(3):583-591.

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