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High-precision optics by application-optimized compression induced solidification (CIS)

通过应用优化的压缩诱导凝固 (CIS) 实现高精度光学器件

基本信息

批准号：
290812922
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 (Transfer Project)
财政年份：
2016
资助国家：
德国
起止时间：
2015-12-31 至 2019-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/290812922?language=en
关键词：
precision optics application optimized compression

项目摘要

The processing technique Compression Induced Solidification (CIS), which was developed at the Institute of Polymer Technology, facilitates obviating problems with standard plastic processing like sink marks, residual stresses and warpage, which arise while the polymer melt undergoes a two phase cooling. The CIS process is possible because the glass transition temperature range of amorphous plastics is pressure dependent and shifts to higher temperatures with increasing pressure. Thus, the plastic can first be solidified at higher temperatures by applying pressure within the cavity, regardless of thickness, and then cooled as a solid. The DFG funded projects "Grundlegende Betrachtungen zum Einfluss hoher Drücke auf den Phasenübergang bei der Kunststoffverarbeitung" and "Übertragung der Grundlagen auf die Spritzgießvariante Druckverfestigung" have expounded upon the fundamental understanding of amorphous thermoplastic materials and shown the great potential behind CIS by producing precise and homogeneous parts. With the fabrication of experimental mold CIS was able to be integrated into automated injection molding processes. Yet, despite this progress the current cycle time is too long to be able to employ CIS for industrial purposes in its current state. Additionally, the mold technology behind the trial mold remains too complicated and expensive for further industrial applications. The purpose of the transfer project "High precision optics by application-optimized, compression induced solidification" is, therefore, to reduce CIS cycle time with innovative approaches. Additionally, the mold and process control concepts will be improved upon and simplified to further facilitate the implementation of CIS into existing processing frameworks. Numerous points meriting scientific research arise from the aim to reduce CIS cycle time. Firstly, the compression speeds effect on the components volume and physical aging remains insufficiently described. This is particular important for components employed at higher temperatures. Another important point is the varying melt temperatures effect on the component properties in the cavity during compression. This effect is directly related to the pressure dependent viscosity of polymer melts, which is to be analyzed with the novel scientific equipment 'Gegendruckviskosimeter'. Furthermore, the exact impression of microstructures is also very promising for thick walled components, because of the high cavity pressures as determined by the process itself. With the production of a specimen 'disc' the aforementioned points can be scientifically and empirically researched. A component 'lens' practically demonstrates the capability of economically producing high precision plastic optics with the innovative method of CIS.

聚合物技术研究所开发的加工技术压缩诱导凝固（CIS）有助于避免标准塑料加工中出现的问题，如聚合物熔体经历两阶段冷却时出现的缩痕、残余应力和翘曲。 CIS 工艺之所以可行，是因为非晶态塑料的玻璃化转变温度范围取决于压力，并且随着压力的增加而转变为更高的温度。因此，无论厚度如何，通过在型腔内施加压力，塑料首先可以在较高温度下固化，然后冷却为固体。 DFG 资助的项目“Grundlegende Betrachtungen zum Einfluss hoher Drücke auf den Phasenübergang bei der Kunststoffverarbeitung”和“Übertragung der Grundlagen auf die Spritzgießvariante Druckverfestigung”阐述了对非晶态热塑性材料的基本理解，并展示了 CIS 背后的巨大潜力通过生产精确且均质的零件。随着实验模具的制造，CIS 能够集成到自动化注塑成型工艺中。然而，尽管取得了这些进展，但当前的周期时间仍然太长，无法在当前状态下将 CIS 用于工业目的。此外，试模背后的模具技术对于进一步的工业应用来说仍然过于复杂且昂贵。因此，“通过应用优化、压缩诱导凝固实现高精度光学”转移项目的目的是通过创新方法缩短 CIS 周期时间。此外，模具和工艺控制概念将得到改进和简化，以进一步促进 CIS 在现有工艺框架中的实施。许多值得科学研究的观点都源于缩短 CIS 周期时间的目标。首先，压缩速度对部件体积和物理老化的影响仍未得到充分描述。这对于在较高温度下使用的组件尤其重要。另一个重要的一点是，不同的熔体温度在压缩过程中对型腔中部件性能的影响。这种效应与聚合物熔体的压力依赖性粘度直接相关，可以使用新型科学设备“Gegendruckviskosimeter”对其进行分析。此外，由于工艺本身决定了高型腔压力，因此对于厚壁部件来说，微结构的精确印记也非常有希望。通过制作样本“圆盘”，可以对上述要点进行科学和实证研究。组件“透镜”实际上展示了利用 CIS 创新方法经济地生产高精度塑料光学器件的能力。