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Optimization of the morphological multi-layer system of micro components by means of a thermally highly flexible process strategy

通过热高度灵活的工艺策略优化微元件的形态多层系统

基本信息

批准号：
318272028
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/318272028?language=en
关键词：
Optimization morphological multi layer system

项目摘要

Inner componential properties substantially affect the components resulting properties within semi-crystalline thermoplastics. How inner-componential properties develop primarily depends on the cooling conditions of the component. These cooling conditions depend on the mold temperature due to the components minimal thickness, especially with regards to micro components. Due to a lack of knowledge on the causal relationships between selected tempering parameters, the establishment of inner properties and the resulting tribological properties, the development of tribologically optimal micro components has proven limited. In the research project "Processing induced morphological influences on the properties of thermoplastic micro gears" fundamental information regarding the influence of inner component properties on the resulting tribological properties were able to be obtained. Results showed that optimal tribological characteristics manifest in particular regions within the component with distinct, inner componential properties. By means of a conventional dynamic temperature strategy, which enables cooling at nearly constant cooling rates, higher cooling velocities along the components edges are achieved. Consequently, fewer distinct, inner componential properties and unfavorable tribological properties are emerged. While slower cooling rates could lead to better tribological properties, it would cause significantly longer cycle time. In order to reduce cycle times and to achieve optimal tribological properties, the mold systems cooling velocity needs to be adjustable flexibly. However, this has proven to be inadequate with current techniques. The aim of this transfer project is to study the aforementioned cooling conditions in micro injection molding, which ensure that every finite layer of a thermoplastic components cross section is exposed to the crystallization temperature area. Additionally, generating an idealized, theoretical injection molding temperature profile through process simulation is of fundamental importance. The ultimate aim is a targeted control of the mold temperature in order to optimize the inner-componential properties and, simultaneously, minimize the cycle time with a new, highly dynamic mold tempering strategy. Using the knowledge acquired to date, a demonstrator, here a micro gear, with homogenous, defined and optimal componential properties across the entire cross-section will be manufactured. With the help of obtained results, exploring new, fundamental questions becomes possible. Using the latest characterization methods for analyzing crystallization behavior with process-based cooling conditions allows establishing a process simulation model in which the micro-injection molding requirements can be ideally considered. Furthermore, the ability to manufacture micro-components with amorphous and highly temperature-resistant materials could also be considered.

内部组分性能在很大程度上影响半结晶热塑性塑料中所得组分的性能。零部件内部特性的发展主要取决于零部件的冷却条件。这些冷却条件取决于模具温度，因为组件的厚度最小，特别是对于微型组件。由于对选定的回火参数之间的因果关系、内在性能的确定以及由此产生的摩擦学性能之间缺乏了解，摩擦学最佳微构件的开发被证明是有限的。在“加工诱导形态对热塑性微型齿轮性能的影响”的研究项目中，能够获得关于内部组分性能对由此产生的摩擦学性能的影响的基本信息。结果表明，最佳的摩擦学特性表现在部件内部具有不同特性的特定区域。通过传统的动态温度策略，能够以几乎恒定的冷却速度冷却，实现了沿部件边缘的更高冷却速度。因此，出现了较少的明显的内部组分性能和不利的摩擦学性能。虽然较慢的冷却速度可能会导致更好的摩擦学性能，但它会导致明显更长的循环时间。为了减少循环次数，获得最佳的摩擦学性能，需要灵活地调整结晶器系统的冷却速度。然而，事实证明，这在目前的技术中是不够的。该转移项目的目的是研究上述微注射成型中的冷却条件，以确保热塑性塑料部件横截面的每一有限层都暴露在结晶温度区域。此外，通过工艺模拟生成理想的、理论上的注塑成型温度分布是至关重要的。最终目标是有针对性地控制模具温度，以优化内部成分性能，同时通过一种新的、高度动态的模具回火策略最大限度地缩短周期时间。利用到目前为止所获得的知识，将制造出在整个横截面上具有均匀的、定义的和最佳的组件特性的演示装置，这里是微型齿轮。在已有结果的帮助下，探索新的、根本的问题成为可能。使用最新的表征方法来分析结晶行为和基于工艺的冷却条件，可以建立一个工艺模拟模型，其中可以理想地考虑微注射成型的要求。此外，还可以考虑使用非晶态和高耐温材料制造微型组件的能力。