• Journal of the KSME
• /
• v.51 no.1
• /
• pp.48-52
• /
• 2011

이 글에서는 수송기계의 에너지효율 환경영향성 승객안전성 향상을 위하여 전 세계적으로 연구를 시작하고 있는 초경량 PCM 샌드위치 판재의 개발 및 적용 동향을 소개하고자 한다.

• Transactions of the Korean Society of Mechanical Engineers A
• /
• v.37 no.4
• /
• pp.529-535
• /
• 2013

A new thin sandwich panel composed of an aluminum expanded metal core adhesively jointed with stainless steel face sheets is introduced, and its mechanical behavior under three-point bending is investigated. The strength and stiffness are analyzed theoretically, and the press-formability and strength enhancement are evaluated experimentally. The specimens with the specific configurations exhibit face yielding well before face-core separation, which means that the sandwich panel can be formed by a press without failure. The measured load levels corresponding to the face yielding and the face-core separation agree fairly well with the theoretical estimations. For a given weight, the sandwich panel is superior to a solid panel in terms of strength, stiffness, and press-formability.

• Polymer(Korea)
• /
• v.27 no.2
• /
• pp.142-151
• /
• 2003

PMMA panels are made by two fabrication methods; cell molding and belt molding processes. But these methods have disadvantages in productivity and cost. So plastic processing engineers are very interested in developing a new production method for PMU panels using plastic films as molds because the new method can reduce production cost of belt molding method as well as can improve productivity of cell molding method. To give a solution for developing such a new molding method, the effects of melthyl methacrylate compound composition and curing reaction condition on the processability and mechanical strength of PMMA panels were investigated in this study. Poly(vinyl acetate) film was used as molds in producing PMMA panels. To determine an MMA compound showing good processability and good mechanical properties after curing, ingredients and their compositions were optimized step by step. Acrylic acid, as a coupling agent and a modifier, played an important role in increasing mechanical strength of PMMA panels.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.16 no.2
• /
• pp.921-926
• /
• 2015

Embossed aluminum sheets were been used in heat insulation purpose for automative exhaust parts because of increasing their surface areas and stiffness reinforcement. However, there are many restrictions because of high rate of wrinkle occurrence on press working. We have performed the tensile and bending tests for embossed sheets to clarity its mechanical properties and springback characteristics. Embossed aluminum sheets showed a different flow stress after plastic yielding due to flattening the embossed cone shape. Above all, yield stress of parallel embossed specimen decreases while its diagonal one increases and the decrease of young's modulus in the embossed sheets contributes to the increase of springback amount.

• Proceedings of the KSME Conference
• /
• 2005.11a
• /
• pp.139.2-139.2
• /
• 2005

• 프린팅코리아
• /
• s.5
• /
• pp.92-95
• /
• 2002

출력용 필름시장은 가고 새로운 대체시장으로 CTP판재가 부상하는가. 우선 수치상으로는 현재 출력용 필름시장이 증가하고 있는 가운데 CTP판재 시장도 급상승하고 있다. 그러나 어느 시점이 되면 두 시장이 점차 엇갈리는 운명의 길로 돌아설 것이라는 의견에는 모두가 공감하고 있는 바다. 물론 두 시장이 지속적으로 공존하겠지만 점차 공급비중이 달라질 게 뻔하기 때문이다.

• Proceedings of the KWS Conference
• /
• 2004.05a
• /
• pp.30-32
• /
• 2004

최근 자동차 산업에서 추구하고 있는 경량 차체 제조와 경량 구조의 건축 판재, 전자 제품 외판재의 필요가 대두됨에 따라 초경량, 고비강성/고비강도 구조재에 대한 연구가 다각도로 진행되고 있으며, 현재 급속도로 적용 영역이 확대되고있다. (중략)

• Journal of the KSME
• /
• v.30 no.3
• /
• pp.231-236
• /
• 1990

컴퓨터의 대단히 빠른 발전속도에 힘입어 공업용 판재의 프레스 성형을 위한 금형의 설계에 유한 요소법을 응용하는 것이 현실적으로 가능해지고 있다. 유한요소 해석 결과의 신뢰도와 수행속도 의 향상을 위하여 위에서 언급한 기술적 문제들에 대한 연구와 개발이 해외에서는 물론, 국내 에서도 활발히 진행되고 있다. 비교적 가까운 시일 내에 관재성형용 금형설계에 유한요소법이 본격적으로 활용될 수 있으리라고 생각된다.

• Journal of the Korea Convergence Society
• /
• v.8 no.4
• /
• pp.199-205
• /
• 2017

In this study, the design analysis and the explosion welding were made into a clad sheet by the convergence method in order to solve the problem of heat transfer to the guide due to the heating of the 3D printer heating block. The shear strength of the clad plate material was tested and the results were analyzed by thermal analysis, thermal conductivity and thermal imaging. The following conclusions were obtained. 3D modeling of the heating block made of copper and titanium clad plate material The thermal analysis showed that the surface temperature of the filament guide area was lower than the heating block surface temperature. The average shear strength of copper and titanium clad plate material was measured and the average value of 195.6MPa was obtained. The thermal conductivity of the heating block made of copper and titanium clad plate material was measured three times and the average value was $62.52W/m{\cdot}K$. The surface temperature of the heating block made of copper and titanium clad plate material was measured by a thermal imaging camera at a maximum of $107.3^{\circ}C$ and $183.2^{\circ}C$ at the filament guide. The temperature distribution was $89^{\circ}C$ lower than that of the existing filament.

• Journal of Korea Society of Industrial Information Systems
• /
• v.17 no.2
• /
• pp.73-80
• /
• 2012

It has been highly required to develope an automatic metal surface inspection system, specifically using image processing techniques, which can replace the visual inspection method in the steel industry. In this paper, we propose a precisional surface measurement system using the moving average image processing technique. When the surface patterns which are generated in the rolling process of metal plates are recognized as defects, the proposed system can measure the actual number of defects. It has been proved that our system shows better results than the conventional FFT method.