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MODELLING FILTERS IN METAL CASTING PROCESSES

机译:在金属铸造过程中建模过滤器

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A number of different types of so-called "filters" are used in the metal casting industries to impart some cleaning effect and flow control on the liquid metal as it passes through them. The filters range from simple planar meshes through extruded channels to reticulated foam structures and they are manufactured from a range of material going from metals to glass or ceramics. It is most common that software packages used in the industry model the filters by a simple pressure drop associated with some area fraction and permeability parameters. Recent experimental work at the IRC in Birmingham has shown that filters of the same type can behave very differently depending upon the casting process in which they are employed. Modelling filter geometries for a range of different casting processes has indicated that the flow of metal and heat losses through the filters are rather complex and should be considered when using filters in the casting processes. This paper will present a number of cases of different types of filters modelled and different processes and indicate some of the sensitivities of the processes to boundary conditions imposed by the process.
机译:在金属铸造工业中使用了许多不同类型的所谓的“过滤器”,以在液态金属通过时赋予其清洁效果和流量控制。过滤器的范围从简单的平面网孔到挤压通道再到网状泡沫结构,其过滤材料是从金属到玻璃或陶瓷。最常见的是,行业中使用的软件包通过与某些面积分数和渗透率参数相关的简单压降对过滤器进行建模。伯明翰IRC的最新实验工作表明,根据使用的铸造工艺,相同类型的过滤器的性能可能会有很大不同。对一系列不同铸造工艺的过滤器几何形状进行建模表明,通过过滤器的金属流和热量损失相当复杂,在铸造过程中使用过滤器时应予以考虑。本文将介绍许多不同类型的过滤器建模和不同过程的案例,并指出过程对过程所施加的边界条件的敏感性。

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