Multi-scale analysis of the material separation mechanisms in grinding of unreinforced thermoplastics

非增强热塑性塑料研磨中材料分离机制的多尺度分析

• 批准号: 326745661
• 负责人: Professor Dr.-Ing. Dirk Biermann
• 金额: --
• 依托单位: Institut für Spanende Fertigung
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/326745661?language=en
• 关键词: Multi; scale; analysis; material; separation

Due to the positive properties of plastics such as low density, high forming flexibility and their energy-efficient production, classic constructive materials such as metal and ceramics are increasingly replaced and complemented. Grinding is a manufacturing process with geometrically undefined cutting edges, which is often used as the finishing process to produce high workpiece qualities and high dimensional shape and surface accuracies. In the state of the art, only a few scientific studies deal with the grinding process of unreinforced thermoplastics. For this reason, fundamental investigations on the grinding processes of the unreinforced thermoplastic polymers Polyoxymethylen Copolymer (POM-C) and Polyetheretherketon (PEEK) were carried out in the first project. Based on these results, process parameters have been found which lead to a reliable grinding process with regard to the occurring process forces and the produced surface quality. Additionally, single grain scratch tests were carried out to analyze the local material separation mechanisms and the chip formation. The results of the single grain scratch tests were summarized to a simplified process model of the grain engagement for each thermoplastic. In the previous grinding investigations, grinding wheel wear was circumvented by regular dressing processes and thus was neglected. However, the grinding wheel wear has a significant influence on the effectiveness of the grinding processes of thermoplastics. That is why fundamental investigations with regard to the wheel wear will be carried out in this project. The results of the grinding wheel wear tests will be connected with the results from the initial project. Additionally, the process parameters which were found for a safe grinding process with regard to high surface quality and the occurring process forces will be extended by the grinding wheel wear. Based on these results, it is possible to design an effective grinding process with minimized wheel wear for the machining of non-reinforced thermoplastics.

由于塑料具有密度低、成型弹性大、生产节能等优点，金属、陶瓷等经典建筑材料正日益被人们所替代和补充。磨削是一种具有几何形状不确定的刃口的制造工艺，经常被用作精加工工艺，以生产出高质量的零件和高尺寸的形状和表面精度。在目前的技术水平下，只有少数科学研究涉及非增强热塑性塑料的研磨过程。为此，在第一个项目中，对非增强热塑性聚合物聚氧亚甲基共聚物(POM-C)和聚醚醚酮(PEEK)的研磨过程进行了基础研究。在这些结果的基础上，找到了在发生的过程力和所产生的表面质量方面导致可靠的磨削过程的工艺参数。此外，还进行了单晶划痕试验，分析了局部材料分离的机理和切屑的形成。将单颗粒划痕试验结果总结为每个热塑性塑料颗粒接合的简化工艺模型。在以往的磨削研究中，砂轮磨损是通过常规的修整工艺来避免的，因此被忽略了。然而，砂轮磨损对热塑性塑料研磨过程的有效性有很大的影响。这就是为什么在这个项目中将进行关于车轮磨损的基础调查。砂轮磨损试验的结果将与初始项目的结果联系起来。此外，对于高表面质量的安全磨削工艺和所产生的制程力而言，砂轮磨损将延长所找到的工艺参数。基于这些结果，有可能设计一种有效的磨削工艺，使砂轮磨损最小化，用于非增强热塑性塑料的加工。