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슬라이드형 휴대전화기 측면 갭의 품질개선을 위한 부품 공차설계
이래우(Rae Woo Lee),정하승(Haseung Chung),지해성(Haeseong Jee),임현준(Hyunjune Yim) (사)한국CDE학회 2012 한국CDE학회 논문집 Vol.17 No.6
This paper investigates the tolerance stack-up in a commercial sliding-type mobile phone model developed by a Korean electronics company, with focus on the dimensional quality of the gap between the sliding top and the main body. The tolerance analysis in this study is done using a commercial software package, which runs Monte Carlo simulations to produce the statistical distributions of the gap size at desired locations. Such an analysis revealed that the original design did not yield the desired dimensional quality of the gap. Through a series of systematic analyses and syntheses, an improved design is proposed for the nominal dimensions and tolerances of selected features of the parts. The proposed design was validated, through tolerance analysis simulation, to meet the desired requirement of the gap quality.
연속체 기반 모델링 기법을 통한 나노복합재의 기계적 성질 해석
공성준(Sungjun Kong),정하승(Haseung Chung),김동철(Dongchoul Kim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
Nanocomposites are recently in the limelight due to the enhancement of their mechanical properties. The nanocomposites have distinct tendency of mechanical properties compared with maro/micro composites due to the specific feature. In the nanocomposites, the effective interface existed discontinuously between particles and polymer has effect on reduction of mechanical properties. The effective interface model assumes that effective interface region is continuous. The effective interface has a significant effect on the mechanical properties of nanocomposite below 50㎚. The mechanical properties of nanocomposites are predicted by continuum modeling based on effective interface model.
〈학술논문 or 기술논문〉 IML 성형과정에 따른 잔류응력 및 열 충격에 의한 변형 예측
이재원(Jaewon Lee),장유진(Eugene Jang),정하승(Haseung Chung),신승원(Seungwon Shin),박승호(Seungho Park) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
In this paper, we developed the methodology to predict residual stress distribution and thermal deformation through in-mold labeling (IML) process. IML is a kind of injection molding process to inject material into the cavity followed by inserting decorated film. This can generate products with outstanding quality of decoration in a single working step. Although IML process has various advantages, it gives rise to some defects such as film delamination, wash-out and flow-mark. Especially, deformation is considered to be a major concern in terms of delamination. To validate the model, the deformation predicted by the model was compared with experimental results and showed good agreement. From this, we can conclude that the method developed in this paper helps to give the guideline to prevent delamination in the initial design stage using IML process.