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doi:https://doi.org/10.5781/JWJ.2019.37.4.8    [Epub ahead of print]
Selecting Optimum Conditions for SPR Processing of High Tension Steel Plates and Aluminium Sheets Using Response Surface Methodology
Sang Woo Lee*, Jae-Woong KIm**
*Manufacturing Engineering, Hwashin Co., Ltd., Yeongcheon, 38898, Korea
**School of Mechanical Engineering, Yeungnam University, Gyeongsan, 38541, Korea
Correspondence: Jae-Woong KIm  Email: jaekim@ynu.ac.kr
Received April 8, 2019  Accepted June 25, 2019  Published online July 22, 2019
ABSTRACT
A study to select the optimal conditions for the self-piercing rivetting (SPR) of dissimilar metal plates was performed by analyzing the bond strength factors using experiments carried out with experimental design methods for the rivets, anvils, and press-fitting factor. The SPR process involves an interaction between an anvil and rivet geometry with a press-in factor, and the bond strength and shape are determined by each process parameter. This makes it important to analyze the factors that will have a great influence on the double bond strength and shape, so that the appropriate conditions can be selected and controlled at the production site. For this purpose, a three-level mixed orthogonal array table was constructed and experiments were performed to find the relationship between the design variables and the response values in the selectable design domain. Through this process, some conditions were identified that are applicable in the field of mechanical bonding of heterogeneous materials by SPR in the automobile manufacturing process. Accordingly, this study selected, materials and thicknesses which were actually utilized for automobiles, Samples were prepared and cross-section shapes were analyzed by scanning electron microscope. Also, an optimum condition for the SPR process for dissimilar metal plates was presented using response surface methodology and the bond strength was estimated.
Keywords: Self piercing rivet | SPR | Response surface methodology | RSM | Joining
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