Abstract
The article is focused on the use of Quality Management tools to identify causes of formation deviations dimensions in cylinder head castings. Moreover, methods of production of castings made from alloy AlSi9Cu1, heat treatment of castings, as well as requirements of their quality are described. Research of the influence heat treatment parameters on the changes of castings' dimensions, with using Quality Management tools (Ishikawa diagram) is described too. In order to optimize the process for eliminate of deviations, experiment for modelling parameters of heat treatment was designed. The results processed in the Pareto diagram clearly pointed out the causes. Dimensional deviations were created during the heat treatment process. We have found the largest distortions in castings were created during rapid cooling. The article gives important information about using of research results in the production of cylinder head castings.
Highlights
Production of cylinder heads (Fig. 1) is achieved by the gravity casting of aluminium alloys AlSi9Cul into metal moulds
The melted material fills the form from the bottom up until it can be seen above the casting in the system this is a tried and true technology for mass production which is used mainly to produce of the castings from alloys with lower melting temperature, such as Al, Cu, and Mg. The advantage of this method is that during pouring we can reach high dimensional accuracy and it lowers the number of faulty castings if the pouring production process is closely followed
Observing and measurement is important in all production phases, in the research - development process, in the production process in the process of entry control
Summary
Production of cylinder heads (Fig. 1) is achieved by the gravity casting of aluminium alloys AlSi9Cul into metal moulds. During gravity casting the melt is metallurgically treated in a holding furnace which is near to the moulds. A disadvantage of this method is the application of structural solutions requires a number of preliminary tasks and can only be used during higher production [1, 2]. Al-Si alloys find applications in such tribological components such as clutches, cylinder liners and pistons in the automotive industry [4].Companies that make products for the automotive industry adhere to the STN P ISO/TS 16 949:2009 norm - QMS, Individual Requirement for using norm ISO 9001:2008 in an organization production of automobiles and replacement parts, which specifies strict conditions for quality production. QMS appropriate for continuous improvement with emphasis on prevention of defects and to limit deviations and losses within the supply chain [5]
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