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A Study on the Optimization of Joint Mandrel Shape for Manufacturing Long Type Elbow Using Push Bending Process

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Abstract

Pipes are widely applied across many industries such as the automotive, aerospace and air conditioning industries. With the development of industrial technology, various pipe materials and various pipe shapes are produced according to the purpose. Many researchers have been studied pipe bending technology to meet these diverse needs, and among them, the long-type elbow is a typical one that changes the moving direction of fluid or gas among various pipe types. Many researchers work on the pipe segment. In-process push-bending used in pipe bending is a bending process where a cut pipe is inserted into a die. Push-bending is effective for reducing the weight of parts that do not induce material loss, but the process is more complicated than the draw-bending process. In this study, we proposed an analytical model for a push-bending process in which a joint type mandrel was added to a long-type elbow made of C1220 material for weight reduction. The forming analysis is to verify the experiment by comparing the analysis result and the experimental result through the forming analysis software DEFORM to confirm the change of the wrinkle and the thickness of the bent pipe. In addition, we confirmed the wrinkling of the bent pipe and the die non-contact phenomenon depending on the angle and position of the joint mandrel and presented the optimum angle and center of gravity position of the joint mandrel using the experimental design method.

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Acknowledgements

This research was financially supported by the Ministry of SMEs and Startups (MSS), Korea, under the “Regional Specialized Industry Development Program (R&D, P0002838)” supervised by the Korea Institute for Advancement of Technology (KIAT).

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  1. School of Mechanical Engineering, Changwon National University, #9 Sarim-dongGyeongsangnam-do, Changwon-si, 641-773, Republic of Korea

    Yea-Jin Yang & Choon-Man Lee

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  1. Yea-Jin Yang
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Correspondence to Choon-Man Lee.

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Yang, YJ., Lee, CM. A Study on the Optimization of Joint Mandrel Shape for Manufacturing Long Type Elbow Using Push Bending Process. Int. J. Precis. Eng. Manuf. 22, 431–439 (2021). https://doi.org/10.1007/s12541-020-00443-4

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