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http://dx.doi.org/10.7736/KSPE.2014.31.7.615

Changes in Dimension and Mechanical Characteristics of Copper Pipe System during Pipe Processing  

Choi, Jei Min (Department of Mechanical Engineering, Korea Univ. Graduate School)
Kim, Soo Min (Department of Mechanical Engineering, Korea Univ. Graduate School)
Chae, Soo-Won (School of Mechanical Engineering, Korea Univ.)
Publication Information
Journal of the Korean Society for Precision Engineering / v.31, no.7, 2014 , pp. 615-622 More about this Journal
Abstract
Copper pipes have been widely used as components of System Air-Conditioner due to high thermal conductivity. This system consists of 150 pipes, which are approximately 10m long in total. Dimensional changes occur during pipe processing such as expansion, reduction and bending. This processing induces changes in length of pipes and makes dimensional differences from original pipes. The summation of the differences of pipes components leads to make huge cumulative dimensional differences. The cumulative differences can cause serious problems such as crack, refrigerant leakage. However the differences have not been considered so far. To satisfy target quality of the system, it is essential to predict and calibrate the differences. In this paper, the changes in dimension were predicted using FEM and it was found that cumulative differences could cause indesirable stress during assembly process. As a result, dimensional differences or indesirable stress could be reduced using the proposed method.
Keywords
Copper; Pipe; Dimension; Pipe Processing; Deformation;
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Times Cited By KSCI : 1  (Citation Analysis)
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1 Kim, S. Y., Seok, C. S., Kim, H. I., Choi, C. H., Mo, J. Y., et al., "Evaluation of Fatigue Characteristic for Ushaped Copper Pipe," Proc. of the KSME Spring/Autumn Conference on Materials and Fracture, pp. 117-122, 2006.
2 London Metal Exchange, "LME Official Price," http://www.lme.com/pricing-and-data/pricing/officialprice (Accessed 12 May 2014)
3 Korean Industrial Standards, "Copper and Copper Alloy Seamless Pipes and Tubes," http://www.standard.go.kr/code02/user/0B/03/SerKs_View.asp?ks_no=KSD5301 (Accessed 12 May 2014)
4 Kim, S. Y., Koo, J. M., Seok, C. S., and Mo, J. Y., "Evaluation of Residual Stress Effect about Fatigue Characteristic of U-shaped Structure," J. Korean Soc. Precis. Eng., Vol. 27, No. 4, pp. 79-86, 2010.   과학기술학회마을