Abstract
The multi-point thermoforming (MPTF) process of resin sheet is introduced, the glass transition temperature of polycarbonate (PC) sheet is tested, and the material parameters of PC sheet are got. Numerical simulation of wrinkle for spherical part is carried out by ABAQUS, and the generated result of wrinkle with MPTF is elaborated. The effects of thickness, forming temperature and spherical radius on wrinkle are investigated by lots of numerical simulations, the outlines of spherical part with different thicknesses are extracted, and the maximum wrinkling value of spherical part with different forming temperatures and spherical radii are calculated. Then the multi-step multi-point thermoforming (MSMPTF) is chosen to depress wrinkle, and series of numerical simulations are put forward to get the forming step of non-wrinkle. Finally, MSMPTF experiment is done. Consequently, the spherical part has good outline shape, which illustrates that the MSMPTF technology is feasible to depress wrinkle.
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