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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.

半结晶热塑性塑料的内部组分性质实质上影响组分的最终性质。部件内部性能如何发展主要取决于部件的冷却条件。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。由于缺乏对所选回火参数之间的因果关系的了解，内部属性的建立和由此产生的摩擦学特性，摩擦学最佳微部件的开发已被证明是有限的。在研究项目“加工诱导形态对热塑性微齿轮性能的影响”中，能够获得关于内部组件性能对摩擦学性能影响的基本信息。结果表明，最佳的摩擦学特性表现在特定的区域内的组件具有独特的，内部的组件属性。通过常规的动态温度策略，其能够以几乎恒定的冷却速率冷却，实现了沿部件边缘的较高的冷却速度沿着。因此，较少的明显的，内在的组成性质和不利的摩擦学性能出现。虽然较慢的冷却速率可以导致更好的摩擦学性能，但它会导致显著更长的循环时间。为了减少循环时间并实现最佳摩擦学性能，模具系统的冷却速度需要灵活调节。然而，这已被证明是不足以与当前的技术。该转移项目的目的是研究微注塑成型中的上述冷却条件，这些条件确保热塑性部件横截面的每个有限层暴露于结晶温度区域。此外，通过工艺模拟生成理想化的理论注塑温度曲线是至关重要的。最终目标是有针对性地控制模具温度，以优化内部组件的性能，同时通过新的高动态模具回火策略最大限度地缩短周期时间。利用迄今为止获得的知识，将制造一个演示器，这里是一个微型齿轮，在整个横截面上具有均匀，定义和最佳的组件特性。在所获得的结果的帮助下，探索新的基本问题成为可能。使用最新的表征方法来分析基于工艺的冷却条件下的结晶行为，可以建立一个工艺模拟模型，其中可以理想地考虑微注塑成型的要求。此外，还可以考虑用非晶和高耐温材料制造微型部件的能力。