This report describes the effects that well established different filter types and running system designs have on the machinability of vertically parted moulded castings. Foundries with vertically parted moulding lines normally want to avoid applying filters because their use can, in some cases, lead to extended cycle times. Consequently, the use of filters has been relatively modest. Recently, however, increasing quality demands has led to a renewed interest from foundries. This paper will deal with grey iron castings such as brake discs, brake drums and clutch plates. The results were obtained from studies, theoretical expertise and foundry field trials. The paper aims to demonstrate that problematic issues regarding filter use on vertically parted moulds can be overcome whilst simultaneously improving the properties of the castings.
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