B11 液体辅助射出成型模内三维温度量测

3D Temperature Measurement in Water-Assisted Injection Molded Parts

苏柏菖、何嘉伟、刘士荣*

Po-Chang Su, Ho-chia wei, Shih-Jung Liu

长庚大学 机械工程研究所

Institute of Mechanical Engineering,Chang Gung University

中文摘要 

针对于PP材料生产厚件成品，分别利用架设钢线法与架设有缝钢管法深入模穴内随着不同制程时间做温度量测，过去文献大都针对螺杆部分温度量测，本研究首度针对射出成型模内温度厚件量测并结合与仿真软件分析比较，加以映证实验值与仿真值的温度趋势符合性，温度对于制程为主要参数且影响工件质量很大，针对PP材料温度分析加以了解其实际温度分布趋势状况，整个制程分为全射及气、液体辅助射出成型来实作，透过利用热电偶深入模内固定量测，分别量测工件分为前、中、后三部分位置上截面温度，在全射方面结果之实验与模拟比较情况良好，在气、液体辅助射出成型量测结果其前面部份之有缝钢管会受到水及气体充填时之阻力而产生偏斜作用，实验与模拟比较差异性较大，而其余部份比较之温度趋势良好，实验中结果发现于射出制程初始阶段熔胶打入模穴在于狭窄流道中会受到剪切热增加影响而量测到之温度会高于熔胶设定之初使温度，另外透过DSC实验计算后获得PP之比热熔随着不同时间之分布值藉以输入Ansys软件做为材料参数设定以模拟出材料于相变区之温度趋势。

英文摘要

Water-assisted injection molding technology has developed rapidly in recent years, due to its some prime advantage improve a lots problem of traditional injection molding technology. The material used was semi-crystalline polypropylene. The objective of this study was to manufacture thermoplastic thick-workpiece by a novel water assisted injection molding method and investigate temperature trend of workpiece inside in different time. In the past, few research of temperature measure was dead against intramural investigation of thick-workpiece injection molding technology. We make use of two metrical methods to acquire different temperature trend of injection molding and chase down optimum temperature curve that it was compared with experimental result. Temperature control of material can insure all operational all right and temperature is parameter of most importance in injection molding process ( pressure is secondary parameter ). Thermocouple strike into melt directly by two fixed methods to measure actual temperature trend of workpiece’ interior section. We use Ansys to simulate temperature distribution with injection time. We must find out error factor and improve on improper methods. At last, experimental result was compared with simulate data.

关键词：液体辅助射出成型、温度趋势、偏斜作用、剪切热、比热熔