Response Surface Methodological Approach in Jewelry-Bodied Casting
Main Article Content
Abstract
Jewelry-bodied casting is the most important upstream process causing defects in jewelry industries. Three process parameters, that are, Ingate, Angle, Mold Temperature and Pouring Temperature which influence to the density of products were studied using response surface methodological approach. Casting materials were three types of silver alloy. A 23 full factorial central composite design (CCD) and a small composite design (SCD) were employed. The relationships of Ingate Angle, Mold Temperature and Pouring Temperature and density of products were determined by using regression analysis. Two models of expected function were used, that are, quadratic model and exponential model of linear equation. The appropriate models were determined and the comparisons of different designs were conducted. The results indicated that small composite design was more efficient than central composite design, quadratic models were more appropriate than exponential models of linear equation in all types of silver alloy using CCD and exponential models of linear equation were more appropriate than quadratic models in all types of silver alloy using SCD.
Keywords: response surface methodology, central composite design, small composite design, jewelry-bodied casting
Corresponding author: E-mail: g4585016@ku.ac.th and fengpsa@ku.ac.th
Article Details
Copyright Transfer Statement
The copyright of this article is transferred to Current Applied Science and Technology journal with effect if and when the article is accepted for publication. The copyright transfer covers the exclusive right to reproduce and distribute the article, including reprints, translations, photographic reproductions, electronic form (offline, online) or any other reproductions of similar nature.
The author warrants that this contribution is original and that he/she has full power to make this grant. The author signs for and accepts responsibility for releasing this material on behalf of any and all co-authors.
Here is the link for download: Copyright transfer form.pdf
References
[2] Draper, N.R. 1982 Center Points in Second-Order Response Surface Designs. Technometrics, 24, 127-133.
[3] Draper, N.R. 1985 Small Composite Designs. Technometrics, 27, 173-180.
[4] Montgomery, D.C. 1997 Design and Analysis of Experiments. 5 th Edition New York. John Wiley and Sons, Inc.
[5] Myers, R.H. and Montgomery, D.C. 1995 Response Surface Methodology : Process and Product Optimization Using Designed Experiments. New York, John Wiley and Sons, Inc.
[6] Pinton, D. 1999 Jewellery Technology : Process of Production Method Tools and Instruments. Italy, Edizioni Gold.
[7] Plaines, D. 1966 Casting Defects Handbook. USA, American Foundrymen’s society training and research institute.