Journal of the Korean Society of Manufacturing Process Engineers (한국기계가공학회지)

The Korean Society of Manufacturing Process Engineers (한국기계가공학회)
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Development of Variable Rolling Pressure Device for Bead-Shape Accuracy and Mechanical Property Enhancement in WAAM

Wire Arc Additive Manufacturing(WAAM)에서 적층 비드(Bead) 형상 정확도 및 기계적 특성 향상을 위한 가변 가압장치 개발

  • Hwang, Ye-Han (Department of Smart Manufacturing Engineering, Changwon Nat'l University) ;
  • Lee, Choon-Man (Department of Mechanical Engineering, Changwon Nat'l University) ;
  • Kim, Dong-Hyeon (Mechatronics Research Center, Changwon Nat'l University)
  • 황예한 (창원대학교 스마트제조융합협동과정) ;
  • 이춘만 (창원대학교 기계공학부) ;
  • 김동현 (창원대학교 메카트로닉스연구원)
  • Received : 2022.05.18
  • Accepted : 2022.06.30
  • Published : 2022.08.31
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Abstract

Metal additive manufacturing (AM) has revolutionized several manufacturing industries. AM can generate large-scale metal components and produce complex geometries close to net-shapes. WAAM is an AM technology that has garnered considerable interest among industries owing to its economics and relatively high deposition rates. However, the heat accumulation in the weld bead during deposition triggers distortion and residual stress. To address these problems, various methods of interpass pressure rolling systems have been suggested in recent research. In addition, combining the rolling and WAAM processes can mitigate residual stresses. The constant-pressure rolling of the interlayer also affect the microstructure. The coarse microstructure of the as-deposited sample was altered to finer equiaxed grains via these methods. However, the bead-shape accuracy of the interlayer constant-pressure method does not consider the heat accumulation in each layer. Therefore, this study develops an interpass variable pressure rolling system that considers the heat accumulation of each layer. The interpass variable pressure rolling system comprises deposition, detection, pressure, and transport units. Finally, verification tests are performed on the interpass variable-pressure rolling system (at 500 kg) with the WAAM process, and the obtained results are discussed.

Keywords

Acknowledgement

이 성과는 정부(과학기술정보통신부)의 재원으로 한국연구재단의 지원을 받아 수행된 연구임(No. 2019R1A5A8083201)

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