A Study on the Optimization of Joint Mandrel Shape for Manufacturing Long Type Elbow Using Push Bending Process
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International Journal of Precision Engineering and Manufacturing https://doi.org/10.1007/s12541-020-00443-4
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A Study on the Optimization of Joint Mandrel Shape for Manufacturing Long Type Elbow Using Push Bending Process Yea‑Jin Yang1 · Choon‑Man Lee1 Received: 21 April 2020 / Revised: 15 October 2020 / Accepted: 16 November 2020 © Korean Society for Precision Engineering 2020
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. Keywords Long type elbow · pipe bending · push-bending process · joint mandrel · weight reduction · forming analysis
1 Introduction Pipes are widely applied throughout the industries such as shipbuilding, automobiles, aerospace and HVAC (Heating, Ventilation, and Air Conditioning) industry. In recent years, as the industry develops, pipes with high strength, characteristics, and light-weight are required in terms of materials and structures of various pipes. And as pipes are used in various fields, pipes of various shapes and materials are made according to their purpose [1–5]. Many researchers have also developed pipe tube bending technology to meet a variety of needs, including tube shape, material and forming tolerances. In particular, the bending pipe is a segment that changes the direction of movement of * Choon‑Man Lee [email protected] Yea‑Jin Yang [email protected] 1
School of Mechanical Engineering, Changwon National University, #9 Sarim‑dongGyeongsangnam‑do, Changwon‑si 641‑773, Republic of Korea
fluid or gas among various pipe types, and bending pipe is divided into long type elbow and short type elbow according to the size and length of the diameter. If the diameter is
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