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High precision micro components by the use of dynamically tempered injection molding

通过使用动态回火注塑成型实现高精度微型部件

基本信息

批准号：
391037722
负责人：
Professor Dr.-Ing. Dietmar Drummer
金额：
--
依托单位：
Lehrstuhl für Kunststofftechnik (LKT)
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2017
资助国家：
德国
起止时间：
2016-12-31 至 2020-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/391037722?language=en
关键词：
precision micro components use dynamically

项目摘要

The aim of the project is the investigation of the time-temperature-pressure conditions for amorphous thermoplastics for the realization of micro components with optimal surface shaping and minimized orientations and residual stresses, while achieving the highest possible dimensional accuracy over the entire component geometry at the same time. The novel process combination, the dynamically tempered injection stamping, combines the advantages of the dynamically tempered injection molding process and injection stamping. Dynamically tempered injection molding allows high surface aspect ratios while injection stamping allows highest dimensional stability over the entire constructional length. On the application side, it is the aim to optimize surface replication, the dimensional stability as well as to minimize residual stresses and orientations taking into account an economic cycle time.Basis of the research project is the knowledge about the various process-specific properties of the dynamically tempered injection molding and the injection stamping process. In the case of conventional dynamically tempered injection molding, volume shrinkage is compensated by melt injection taking place during the holding-pressure phase, resulting in limited dimensional tolerances due to inhomogeneous pressure distributions over the flow path. Injection stamping normally takes place at temperatures below the glass transition temperature of the material. Because of the fast solidification close to the edge of the part, this results in limitations in the shaping of fine surface structures. By combining both manufacturing processes, the advantages of the processes are not only to be used synergistically for the dynamically tempered injection stamping, but by means of the use of process-relevant material parameters and a temperature- and pressure-dependent process simulation, a maximum utilization of the component properties is to be achieved.

该项目的目的是研究非晶态热塑性塑料的时间-温度-压力条件，以实现具有最佳表面形状、最小化方向和残余应力的微型组件，同时在整个组件几何形状上实现尽可能高的尺寸精度。这种新颖的工艺组合——动态回火注射冲压，结合了动态回火注射成型工艺和注射冲压的优点。动态回火注塑成型可实现高表面纵横比，而注塑冲压可在整个结构长度上实现最高的尺寸稳定性。在应用方面，其目标是优化表面复制、尺寸稳定性以及最大程度地减少残余应力和方向，同时考虑到经济周期时间。该研究项目的基础是有关动态回火注塑成型和注塑冲压工艺的各种工艺特定性能的知识。在传统的动态回火注塑成型的情况下，体积收缩通过保压阶段发生的熔体注射进行补偿，由于流道上的压力分布不均匀，导致尺寸公差有限。注射冲压通常在低于材料玻璃化转变温度的温度下进行。由于靠近零件边缘的快速凝固，导致精细表面结构的成型受到限制。通过结合两种制造工艺，这些工艺的优点不仅可以协同用于动态回火注塑冲压，而且通过使用与工艺相关的材料参数以及与温度和压力相关的工艺模拟，可以最大限度地利用部件特性。