Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
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Study of the Assembly of Indoor Air-conditioner Unit Using Tolerance Analysis

공차해석을 이용한 에어컨 실내기의 조립성에 관한 연구

  • Kim, Cheulgon (Global Technology Center, Samsung Electronics Co. Ltd.) ;
  • Hwang, Jihoon (Global Technology Center, Samsung Electronics Co. Ltd.) ;
  • Seo, Hyeongjoon (Air Conditioning Technical Expert Lab., Samsung Electronics Co. Ltd.) ;
  • Mo, Jinyong (Air Conditioning Technical Expert Lab., Samsung Electronics Co. Ltd.) ;
  • Jung, Duhan (Air Conditioning Technical Expert Lab., Samsung Electronics Co. Ltd.) ;
  • Hong, Seokmoo (Dept. of Metalmold Design Engineering, Kongju Nat'l Univ.)
  • 김철곤 (삼성전자 글로벌기술센터) ;
  • 황지훈 (삼성전자 글로벌기술센터) ;
  • 서형준 (삼성전자 생활가전 에어컨전문기술) ;
  • 모진용 (삼성전자 생활가전 에어컨전문기술) ;
  • 정두한 (삼성전자 생활가전 에어컨전문기술) ;
  • 홍석무 (국립공주대학교 금형설계공학과)
  • Received : 2014.10.14
  • Accepted : 2015.01.30
  • Published : 2015.04.01
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Abstract

To identify locations and causes of interference among parts of an indoor air-conditioning unit, a 3D tolerance analysis was performed and optimized with respect to assembly gaps and the tolerance of each part. The maximum value of the defect rate resulting from the tolerance analysis was found to be 72.6 at the assembly portion of the body and drain. The maximum displacement caused by the thermal deformation during a heating operation was calculated to be approximately 1 mm by using finite element analysis (FEA). Therefore, it is possible that an interference among the assembled parts occurs. The tolerance of the drain was modified by the results of the sensitivity analysis. As a result, the defect rate was greatly reduced to 0.03. Through the FEA results of the indoor air-conditioning unit, it was shown that the improved tolerance of the drain decreased the interference among the assembled parts even though thermal deformation occurs during operation.

에어컨 실내기 조립 시 부품간 간섭이 발생하는 위치와 원인 분석을 위해, 3차원 공차해석을 수행하고 부품공차 및 조립 갭을 최적화했다. 민감도 분석을 통해 초기 설계에서 drain과 body 조립부의 불량발생 확률이 72.6%로 가장 높은 것을 확인했고, 또한 유한요소해석(FEA)을 활용 에어컨 실내기의 난방작동 시 열 변형으로 인해 최대 약 1mm의 변위가 발생하여 부품간 간섭이 발생할 수 있음을 확인했다. 이런 부품간 간섭을 최소화기 위해서 3D 공차 해석의 민감도 분석결과를 토대로 drain의 부품공차를 수정하였다. 개선 공차 반영 해석결과 불량률이 0.03%로 크게 감소함을 확인하였다. 또한, 개선공차 반영 시 에어컨 작동 중 열 변형이 발생하여도 부품간 간섭이 발생하지 않음을 FEA를 통해 검증하였다.

Keywords

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