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A review of liquid silicone rubber injection molding: Process variables and process modeling
Polymer Engineering and Science ( IF 3.2 ) Pub Date : 2021-01-05 , DOI: 10.1002/pen.25618 Matthew Bont 1 , Carol Barry 1 , Stephen Johnston 1
Polymer Engineering and Science ( IF 3.2 ) Pub Date : 2021-01-05 , DOI: 10.1002/pen.25618 Matthew Bont 1 , Carol Barry 1 , Stephen Johnston 1
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Liquid silicone rubber (LSR) is an elastomer molded into critical performance components for applications in medical, power, consumer, automotive, and aerospace applications. This article reviews process behavior, material modeling, and simulation of the (LSR) injection molding process. Each phase of the LSR injection molding process is discussed, including resin handling, plastication, injection, pack and hold, and curing; and factors affecting the molding process are reviewed. Processing behavior of LSR is marked by transient interactions between curing, shear rate, temperature, pressure, and tooling. Therefore, current LSR models for curing, viscosity, pressure, and temperature are discussed. Process dynamics and material modeling are combined in LSR injection molding simulations with applications in mold design, troubleshooting process‐induced defects, and management of shear stress and non‐uniform temperatures between LSR and substrates during overmolding. Finally, case studies using commercial simulation software are presented, which have shown cavity pressure and flow front advancement within 3% of experimental values. Optimization of LSR materials, data collection, model fitting, venting, and bonding remain areas of continued interest.
中文翻译：
液态硅橡胶注射成型综述：工艺变量和工艺建模
液态硅橡胶（LSR）是一种模压成关键性能部件的弹性体，适用于医疗，电力，消费，汽车和航空航天应用。本文介绍了工艺行为，材料建模和（LSR）注塑工艺的仿真。讨论了LSR注射成型过程的每个阶段，包括树脂处理，塑化，注射，包装和保持以及固化。并回顾了影响成型工艺的因素。LSR的加工行为以固化，剪切速率，温度，压力和工具之间的短暂相互作用为特征。因此，讨论了用于固化，粘度，压力和温度的当前LSR模型。LSR注塑模拟中将过程动力学和材料建模与模具设计中的应用相结合，解决过程中引起的缺陷，以及在包覆成型期间管理LSR和基材之间的剪切应力和温度不均匀。最后，介绍了使用商业仿真软件进行的案例研究，这些案例表明腔体压力和流场前移在实验值的3％以内。LSR材料的优化，数据收集，模型拟合，排气和粘接仍然是人们持续关注的领域。
更新日期：2021-02-08
中文翻译：
液态硅橡胶注射成型综述：工艺变量和工艺建模
液态硅橡胶（LSR）是一种模压成关键性能部件的弹性体，适用于医疗，电力，消费，汽车和航空航天应用。本文介绍了工艺行为，材料建模和（LSR）注塑工艺的仿真。讨论了LSR注射成型过程的每个阶段，包括树脂处理，塑化，注射，包装和保持以及固化。并回顾了影响成型工艺的因素。LSR的加工行为以固化，剪切速率，温度，压力和工具之间的短暂相互作用为特征。因此，讨论了用于固化，粘度，压力和温度的当前LSR模型。LSR注塑模拟中将过程动力学和材料建模与模具设计中的应用相结合，解决过程中引起的缺陷，以及在包覆成型期间管理LSR和基材之间的剪切应力和温度不均匀。最后，介绍了使用商业仿真软件进行的案例研究，这些案例表明腔体压力和流场前移在实验值的3％以内。LSR材料的优化，数据收集，模型拟合，排气和粘接仍然是人们持续关注的领域。
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