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Process influence in the combined compaction and back-injection process for manufacturing of self-reinforced composites

自增强复合材料制造联合压实和回注工艺的工艺影响

基本信息

批准号：
376572189
负责人：
Professor Dr.-Ing. Hans-Peter Heim
金额：
--
依托单位：
Fachgebiet Kunststofftechnik
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/376572189?language=en
关键词：
Process influence combined compaction back

项目摘要

In an extrusion process, high-strength fibers or tapes can be produced. A combination of melt deformation and solid state drawing results in highly anisotropic properties, with up to 5 or 6 times higher strength and stiffness, in direction of orientation, than the conventional injection-molded samples. These properties are used for the production of self-reinforced composites. The fibers or tapes are first processed into textiles. Subsequently they are stacked in several layers and are consolidated to a self-reinforced composite system in a hot compaction process. The aim of this research project is to investigate the necessary fundamentals in order to be able to assess the process influences during a combined hot compaction and back-injection process to produce composites. This process enables the production of self-reinforced composites by means of a simultaneous consolidation and back-injection molding process in one tool. In the back-injected areas the stacked textiles are consolidated by the injection pressure of the polymer melt only. The microstructure of the self-reinforced material, which is directly related to the mechanical properties, is highly influenced by the inflowing melt. By means of this temperature sensitivity, self-reinforced composites can be graded, which means the implementation of local different mechanical properties, due to different process settings. This can be used to produce components with different stiffness in defined areas, only caused by the different process control, while material is chemically identical. Thus, monomaterial systems are produced which consist of consolidated textiles and an injection molded component of the same polymer. This results in excellent recycling properties.Within this research project, the influence of the combined compaction and injection molding process on the microstructures of the material, the warpage of the specimen, the adhesion between the melt and the composite, the mechanical properties of the composite and the local pressure and temperature levels along the flowpath are investigated, with and without a thermal grading of the self-reinforced composites. The local conditions are finally summarized in a describing model. This is intended to form the base for the understanding of the process and the construction of components produced by this manufacturing process.

在挤出过程中，可以生产高强度纤维或带。熔融变形和固态拉伸的组合导致高度各向异性的特性，在取向方向上具有比常规注塑样品高5或6倍的强度和刚度。这些特性用于生产自增强复合材料。纤维或带首先被加工成纺织品。随后，它们被堆叠成几层，并在热压工艺中被固结成自增强复合系统。本研究项目的目的是调查必要的基本原理，以便能够评估过程中的影响，结合热压成型和回注工艺生产复合材料。该工艺通过在一个工具中同时进行固结和反向注塑成型工艺，实现了自增强复合材料的生产。在回注区域中，堆叠的织物仅通过聚合物熔体的注射压力来固结。自增强材料的微观结构与材料的力学性能有直接关系，熔体的流动对材料的微观结构有很大的影响。通过这种温度敏感性，可以对自增强复合材料进行分级，这意味着由于不同的工艺设置而实现局部不同的机械性能。这可以用于生产在限定区域具有不同刚度的部件，仅由不同的过程控制引起，而材料是化学相同的。因此，生产出由固结的纺织品和相同聚合物的注塑成型部件组成的单材料系统。在本研究项目中，结合压实和注射成型工艺对材料的微观结构，试样的翘曲，熔体和复合材料之间的粘附，复合材料的机械性能和局部压力和温度水平沿着流动路径的影响进行了研究，有和没有自增强复合材料的热分级。最后将当地情况总结为描述模型。这旨在为理解该工艺和通过该制造工艺生产的组件的结构奠定基础。