The design and manufacture of injection molded polymeric parts with desired properties is a costly process dominated by empiricism, including the repeated modification of actual tooling. Among the task of mould design, designing the mould specific supplementary geometry, usually on the core side, is quite complicated by the inclusion of projection and depression.
The product stress analysis reveals very limited information since the product produced was for warpage testing purposes and had no relation with tensile loading analysis.
4 Conclusions
In future, however, it is suggested that the product service condition should be determined so that further analysis may be carried out for other behaviors under various other loading.that affect warpage. The testing specimen was produced at low cost and involves only little finishing that is degating.
The thermal analysis of plastic injection mould has provided an understanding of the effect of thermal residual stress on deformed shape of the specimen and the tensile stress analysis of product managed to predict the tensile load that the warpage testing specimen can withstand before experiencing failure.
摘要:
本文介绍注塑模具设计生产翘曲测试样本以及为了获得残余热应力的影响在模具中执行热分析。这项技术、理论、方法在注射模具设计中必须被考虑运用。在商业计算机上使用13.0版本的计算机辅助设计软件UG进行模具的设计。使用商用有限元分析软件LUSAS分析家分析发现并揭示由于试样的冷却不均匀使塑件存在残余热应力的分析报告。该软件提供模型的温度等高线分布图并通过注塑周期时间响应曲线绘制温度变化曲线。结果表明与其它区域相比收缩更可能会发生在冷却渠道附近。模具这种不平衡的冷却效果有助于不同区域翘曲的产生。
关键词:注塑模具 设计 热分析
1 引言
塑料工业被列为一个数十亿美元的产业,是世界上增长最快的行业之一。在日常生活中几乎所有的用品都离不开塑料,而大多数这些塑料都可以用注塑的方法生产。众所周知注塑成型加工是以较低的成本生产各种形状复杂的几何体产品。论文网
注塑成型加工是一个循环过程。在注塑过程中有四个重要的阶段。这四个阶段是加料阶段、保压阶段、冷却阶段和顶出阶段。塑料注塑成型加工首先是往注射机料斗中添加树脂和适当的添加剂,并加热塑料注射机的料斗到喷嘴部分。在注射温度下模具型腔充满热聚合物熔体,在模具型腔填满后的保压阶段,更高压力下更多的聚合物熔体装入型腔,以补偿前期聚合物凝固引起的收缩。接下来是模具的冷却阶段,塑件在排出前被冷却到足够的强度。最后一步是顶出阶段,模具开模同时顶出塑件,然后模具再次合上并开始下一个周期。
事实证明设计和制造理想性能的高分子注塑成型零件是一个昂贵的工程,包括反复修改加工,在模具设计任务中,设计模具明确附加几何结构,核心方面通常包括相当复杂的凸凹面。
为了设计模具必须考虑许多重要的设计因素。这些因素分别是模具的尺寸、型腔数、型腔的布局、浇注系统、浇口系统、收缩和顶出机构。 塑料注射模具设计英文参考文献和中文翻译(5):http://www.751com.cn/fanyi/lunwen_12416.html