摘要
以瓶盖注塑模具为研究对象,设计了4种不同的随形冷却方案,利用COMSOL软件对模具进行热分析,分析不同冷却水道塑件达到脱模温度所需时间、表面温度分布以及冷却水道压力损失,结果表明第四种冷却水道的冷却性能最优.利用Design-Expert 13软件,基于Box-Behnken响应曲面试验设计方法对第四种冷却水道进行结构优化,获得了给定条件下的最优解,使冷却水道达到脱模时间降低 1.42%,表面温度标准差降低 2.97%,压力损失降低19.86%.本文方案提升了瓶盖模具冷却性能,缩短了产品的生产周期,提高了产品表面质量,为其他注塑模具冷却水道结构优化提供参考.
Abstract
In the competitive field of plastic manufacturing,particularly in the production of bottle caps,the ef-ficiency and quality of injection moulding processes are of paramount importance.This study delves into an in-novative approach to enhance the cooling efficiency of plastic bottle cap injection moulds,a critical factor in re-ducing cycle times and promoting product quality.By introducing four novel form-following cooling designs,this research aims to pioneer advancements in mould cooling technologies.The analysis uses COMSOL Mul-tiphysics software,an advanced finite element analysis tool,to perform thermal analysis of the mold.This as-sessment includes the time required for the plastic to reach the release temperature,the uniformity of the mold surface temperature distribution,and the quantification of the pressure loss in the cooling channel.The results show that the fourth cooling channel scheme of the four designs has remarkable advantages in its excellent cooling performance and efficiency,achieving the shortest time for plastic parts to reach the release tempera-ture(5.6 s),the lowest standard deviation of mold surface temperature distribution(11.44)and the smallest cooling channel pressure loss(2.82 Pa).Further,this study uses Design-Expert 13 software combined with Box-Behnken response surface Design method to deeply optimize the structure of the fourth cooling channel.This optimization phase focused on fine-tuning the structure of the fourth cooling channel by adjusting key de-sign variables:The diameters of the cooling channel and cooling cavity,along with the condensate flow rate.The objective was to enhance cooling efficiency comprehensively while reducing the demoulding time,improv-ing the uniformity of surface temperature,and minimizing pressure loss within the cooling system.The opti-mization yielded significant improvements:The condensate flow rate was set at 0.015 m/s,the cooling chan-nel diameter at 7.76 mm,and the cooling cavity diameter at 16.85 mm.These optimized parameters led to a 1.42%reduction in stripping time,a 2.97%decrease in surface temperature standard deviation,and a notable 19.86%reduction in cooling channel pressure loss.The results of this study not only optimize the cooling effi-ciency of the bottle cap mold,shorten the production cycle of the product,improve the surface quality of the product,but also provide a theoretical basis and practical guidance for the design and structural optimization of the injection mold cooling system.In addition,through the exploration and application of form-following cool-ing technology,this study provides an important academic contribution to the field of mold design,and lays a foundation for the future research and development of mold cooling technology.
基金项目
四川省科技计划重点研发项目(2022ZHCG0049)
国家科技期刊平台
NSTL
万方数据