Research of Cooling Shrinkage Deformation for Multi-point Thermoforming of Resin Sheet

[摘要] The multi-point thermoforming (MPTF) process of resin sheet are introduced, the material parameters of resin sheet and elastic cushion are got, the finite element model of MPTF for resin sheet is set up, and numerical simulations of cooling shrinkage deformation of resin sheet are carried out. The influence factors such as material, thickness and radius are studied by lots of numerical simulation, and the shape compensation of cooling shrinkage deformation is put forward to deduce the forming error. Then, MPTF experiment of spherical part with Polymethylmethacrylate (PMMA) sheet is put forward, and the comparisons of shape error between experimental parts and object surfaces are obtained. Consequently, it is confirmed that PMMA sheet formed by MPTF after shape compensation has good shape accuracy.

[发布机构] Shanghai Spaceflight Precision Machinery Institute, Shanghai; 201600, China^1

[效力级别] 无线电电子学

[关键词] Elastic cushion;Forming errors;Material parameter;Multi-points;Object surface;PMMA sheets;Shape errors;Shrinkage deformation