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Investigation on Reactions at Corners of Cast Part during Investment Casting of Reactive AZ91 Magnesium Alloy

Vyas Akash V., Sutaria Mayur .

Archives of Foundry Engineering

2020

Vol. 20, iss. 4

139--144

The magnesium alloy investment castings have greater potential for automobile and air-craft applications due to the higher strength to weight ratio of magnesium alloys and capability of the investment casting process to produce near net shape complex castings. The interfacial-mould metal reactions during investment casting of magnesium alloy inhibit successful production of quality castings. This paper presents the investigation done on the reactions at corners of AZ91 magnesium alloy cast part produced through investment casting. The stepped shape geometry of casting was selected to study the reactions at convex and concave corners of the cast part. The reacted surfaces were characterised using the SEM-EDX and XRD. The formation of oxides was observed on cast surface from characterisation. The temperature profile recorded at corners were helpful to understand the heat dissipation during the solidification of metal at corners. It was observed that the reactions occurred at the concave corner were more as compared to the convex corner of the cast part.

Wpływ czynników produkcyjnych na jakość wysokociśnieniowych odlewów wykonanych ze stopów z grupy Al-Si - analiza z wykorzystaniem diagramu Ishikawy

Poloczek Ł., Kiełbus A.

Zarządzanie Przedsiębiorstwem

2018

Vol. 21, nr 4

2--8

Production of products required by the customer quality is one of the most important issues related to the management company. So far, quality control of the product was carried out at the end of the production process. It is increasingly giving way to projects aimed at bringing about a situation in which the number of defective products will be significantly reduced. In this situation, it becomes necessary to take action to identify the causes of major importance for the final result of the production process. For this purpose they are increasingly used quality management tool. The article presents the use of Ishikawa cause-effect diagram to identify the causes of casting defects in high pressure die casting Al-Si alloys.

Wpływ czynników technologicznych na jakość odlewów ze stopów aluminium

Poloczek Ł., Kiełbus A.

Zarządzanie Przedsiębiorstwem

2016

Vol. 19, nr 2

14--19

To produce die-cast with high quality while maintaining the required performance affects many stages of the production process. These steps are dependent on each other and in the end of production process they decide on the competitiveness of manufactured elements. The main aspect affecting on the high quality and thus on the competitiveness of castings is finding that casting is free from defects. The great diversity of the disadvantages of the castings results from the technology of production casting, which is affected by a series of many technological operations, including: design and construction of the mold, technology of melting and casting molten metal into the mold and carrying out machining after casting.