关键词: 快速热循环注塑成形, 热响应分析, 管道加热系统优化, 多目标优化, 注塑模具

Abstract: Under the constraints of given heating pipe layout and the maximum allowable energy consumption, aiming to achieve rapid and uniform heating of the RHCM mould cavity surfaces, with the heat flux density of the single heating rod as the design variable, a method combining the finite element simulation, response surface design and multi-objective particle swarm optimization(MOPSO) technology was proposed to optimize the RHCM mould electric heating systems. After optimization, the maximum temperature difference of the mould cavity surfaces and the energy consumption of the heating systems are reduced by 63.4% and 9% respectively. The surface quality of flat plastic parts molded was compared with that under the conventional injection molding and RHCM processes respectively. The results show that the product surface roughness Ra may be reduced from 320 nm to 118 nm, and the surface defects such as weld marks and shrink marks also may be effectively suppressed by RHCM processes. It is also found that the product surface roughness has a negative correlation with the temperature of the cavity surfaces at the same location, indicating that the optimized cavity surface temperature distribution is more conducive to improve the product surface quality.

Key words: rapid heat cycle molding(RHCM), heat response analysis, pipe heating system optimization, multi-objective optimization, injection mould