Investigation of the influence of the cylinder temperature control on the process behavior of single-screw extruders and design of a practical cylinder temperature control

研究机筒温度控制对单螺杆挤出机工艺行为的影响并设计实用的机筒温度控制

• 批准号: 282084275
• 负责人: Professor Dr.-Ing. Volker Schöppner
• 金额: --
• 依托单位: Fachgebiet Kunststoffverarbeitung
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2015
• 资助国家: 德国
• 起止时间: 2014-12-31 至 2018-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/282084275?language=en
• 关键词: Investigation; influence; cylinder; temperature; control

The process-oriented behavior and thus selectively influencing the behavior of screw machines on the choice of cylinder temperature profile often requires a high understanding of the process and a great deal of experience in product processing. Here, the choice of the temperature profile is of great importance for the later quality of the product to be processed and also has impact on the efficiency of the system. Various research projects have already been proven that specific adaptation of the cylinder temperature profile to the respective process lead to an increase in output rates with otherwise the same process conditions. In addition, there is a great potential in the improvement in terms of energy, because a wrong chosen temperature profile may lead to worse melting performances in the process and the energy introduced often has to be removed again unused with cooling units. The problem declines, if regularly varying process parameters, different materials and screw geometries are used in the processing, so that a continuous adaptation of the temperature control is required. The aim of this research project should be to conduct investigations in the field of cylinder temperature control, with influence and control variables are to be identified in the process, from which derive optimization strategies can be determined and transformed in an appropriate temperature control. The to be determined control system is assumed to be an independent expert system, which can be added with codes of practice and experimental model laws from the previous process points. The control technology mapping of the entire system should be done by the abstraction of the extrusion process framed in a model level. By dividing into sub-processes and mutual consideration of sub-processes with each other, the reaction between thermal, rheological and actuator-based processes can be modelled. In addition, heat transfer effects, which also take place by conduction in the screw and barrel areas and mutually by convection with the melt, will be considered and by that combined with the already developed models for the description of the temperature profiles in screw machines. This will lead ultimately to a better predictability of extrusion processes. At the end of the project, the implementation of the temperature control system should be located in an existing extrusion system, to which numerous studies validating the mentioned model approaches are planned.

以工艺为导向的行为，从而选择性地影响螺杆机在缸体温度曲线选择上的行为，通常需要对工艺的高度了解和产品加工方面的大量经验。这里，温度曲线的选择对于待加工产品的后期质量非常重要，并且也影响系统的效率。各种研究项目已经证明，在相同的工艺条件下，气缸温度曲线对相应工艺的具体调整可以提高产出率。此外，在能量方面还有很大的改进潜力，因为错误选择的温度曲线可能会导致工艺中的熔化性能变差，并且引入的能量通常必须再次被移除，不与冷却装置一起使用。如果定期改变工艺参数、在加工中使用不同的材料和螺杆几何形状，则问题会减少，从而需要不断调整温度控制。本研究项目的目的是在气缸温度控制领域进行研究，识别过程中的影响和控制变量，从中确定优化策略并转化为适当的温度控制。待确定的控制系统被假设为一个独立的专家系统，可以添加来自先前过程点的实践代码和实验模型定律。整个系统的控制技术映射应该通过模型级别的挤出过程的抽象来完成。通过划分子过程以及子过程之间的相互考虑，可以对热过程、流变过程和基于致动器的过程之间的反应进行建模。此外，还将考虑通过螺杆和机筒区域的传导以及与熔体的相互对流而发生的传热效应，并将其与用于描述螺杆机中的温度分布的已经开发的模型相结合。这最终将导致挤出过程具有更好的可预测性。在项目结束时，温度控制系统的实施应位于现有的挤出系统中，并计划进行大量研究来验证上述模型方法。