Abstract
Investment casting is the most adaptable and durable manufacturing process dating back thousands of years, with a rapidly increasing application. It is used primarily for the development of complex components near net-shape. A wax pattern in the exact replica of the cast part is used here. When the mold has been formed, the wax pattern is melted out. For this purpose this process is called lost wax process. In this present study investment casting process parameter is optimized by using Taguchi approach to improve the mechanical properties of mild steel. A set of experiments were conducted as per Taguchi’s L9 orthogonal array to determine the most influential control factors. For test the performance characteristics, orthogonal range, signal to noise ratio and variance analysis were used. Data values are obtained under the constraint of different process parameters like preheat temperature, pouring temperature, preheat time to investigate their effects on the surface hardness, tensile strength of the final results. The variations in the trend of the mechanical properties were observed. It was found that high mold preheat temperature, higher pouring temperature, maximum preheat time significantly reduce the mechanical properties of the castings.
Highlights
Investment casting has been a widely used process for hundreds of years [1]
The components and machines which are used in investment casting are wax pattern, ceramic slurry, metal die, ferrous or non-ferrous metal, cutting and sand blasting machine
Very poor response in case of 2.0 hrs preheat time, 2.5 hrs presents better result than previous, but 3 hrs is not satisfactory, it may be for some random errors in this process
Summary
Investment casting ( known as ‘lost wax casting’ or ‘precision casting’) has been a widely used process for hundreds of years [1]. It is one of the primeval casting processes, in which into an expendable ceramic mold molten metal is poured. When the mold has been formed the wax pattern is melted out For this reason investment is known as “lost wax casting”. Some researchers have successfully carried out studies on the varying effects of investment casting process parameters on the mechanical properties of casted metals and their alloys [5,6,7,8,9]
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