Transactions of Materials and Heat Treatment

Title：Influence factors on wrinkle of polycarbonate sheet in multi-point thermoforming

Authors： Peng Heli Zan Lin Li Mingzhe Li Zhongquan

Unit： Shanghai Spaceflight Precision Machinery Institute Shanghai Academy of Spaceflight Technology Jilin University

KeyWords： polycarbonate sheet multi-point thermoforming wrinkle numerical simulation transition temperature

ClassificationCode：TG320

year,vol(issue):pagenumber：2017,42(11):79-83

Abstract：

In order to investigate the influence factors on wrinkle of polycarbonate (PC) sheet in multi-point thermoforming（MPTF）, the principle of multi-point thermoforming for sheet was introduced, and the glass transition temperature of PC sheet was tested. Then, the stress relaxation curves of PC sheet under different temperatures were obtained, and the finite element model of multi-point thermoforming for spherical part was built. At last, the numerical simulation of wrinkle for spherical part in multi-point thermoforming was got, and the influences of thickness, radius and forming temperature on the wrinkle were researched. The numerical simulation results show that a thicker sheet, or a larger radius, or a lower forming temperature can bring a smaller wrinkles. In addition, the non-wrinkle FLD of PC sheet under different sheet thicknesses, radius and deformation temperatures was obtained respectively, and the experiments of multi-point thermoforming for PC sheet were carried out. Finally, the validity of simulated results and practicability of non-wrinkle forming limited diagram were verified by experimental results.

Funds：

国家自然科学基金资助项目 (51505278)

作者简介：彭赫力（1986-），男，博士，高级工程师 E-mail：phl12616040811@126.com 通讯作者：李中权（1964-），男，学士，博士生导师 E-mail：lizhongquan401@163.com

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