• 한국HCI학회:학술대회논문집
• /
• 한국HCI학회 2009년도 학술대회
• /
• pp.516-520
• /
• 2009

기존의 의류 제작 공정에 있어 대량 생산에 들어가기 전, 제품의 원형을 제작하는 단계는 매우 빈번한 실패를 동반하는 과정이다. 원하는 디자인으로 완성된 제품을 얻기 위해 수많은 시행착오를 거치게 되며, 이 과정에서 원단, 자재, 인력이 지속적으로 투입되고 그 결과 비용, 혹은 일정 상의 손실을 초래하기도 한다. 따라서 본 논문에서는 이와 같은 의류 원형 제작 과정을 실제 옷을 만들어보는 것이 아닌, 컴퓨터의 3D 환경 안에서 가상의 옷을 만들고 시뮬레이션 하여 가상의 모델에 입혀보는 것으로 대체하는 방법을 제안한다. 이 과정에서 그간 컴퓨터 그래픽스 분야를 중심으로 발전해왔던 의류 시뮬레이션 기술을 적극 도입, 활용한다. 그리고 이러한 과정을 거쳐 만들어진 3D 의류가 실제 의류 원형과 어느 정도 일치하는지를 비교분석 함으로써 이 기술이 의류 생산 과정에 적용가능한지를 검증한다.

• 한국기계가공학회지
• /
• 제1권1호
• /
• pp.79-88
• /
• 2002

High speed machining system have been used in industrial because it is effective to a material manufacturing with various shape. Recently the end-milling processing is needed the high-precise technique with good surface roughness and rapid time in aircraft, automobile part and molding industry. Therefore this study proposed to decide best manufacturing cutting condition for surface roughness and rapid manufacturing tune by using computer Image processing system and 3D modelling. Until the 16,000 rpm, the surface roughness is decreased rapidly, but it is not over that. The 22,000 rpm is the spindle speed with the optimum surface in the high speed end-milling. In the case of the feed rate with 2,000 mm/mm and 8,000 mm/mm, the surface roughness is better than 4,000 mm/min and 6,000 mm/min. By using the 3D modelling, it is effectively represented shape characteristics of working surface m high speed end-milling.

• 소성∙가공
• /
• 제11권4호
• /
• pp.323-331
• /
• 2002

The combination of rapid prototyping(RP) and rapid tooling(RT) has a potential for rapid manufacturing of three-dimensional parts. In the present study, a new RP system transfer type Variable Lamination Manufacturing using Expandable Polystyrene Foam (VLM-ST), is proposed to fabricate net shapes of three-dimensional prototypes. Various three-dimensional parts, such as a knob shape and a human head shape, are manufactured by the VLM-ST apparatus. In addition, a new rapid tooling technology, which utilizes a room temperature vulcanizing (RTV) molding technique and a triple reverse process technique, is proposed to manufacture net shapes of three-dimensional plastic parts using the prototypes of VLM-ST. A plastic part of the knob shape is produced by the proposed RT technology. The combination of the proposed RP and RT enables the manufacture of a plastic knob within two days.

• 항공우주시스템공학회지
• /
• 제13권1호
• /
• pp.54-61
• /
• 2019

3D프린팅은 '12년 세계경제포럼에서 떠오르는 10대 기술 중 2번째로 선정이 되었고 기존 산업의 패러다임을 변화시켜 제조업 혁신과 신 시장을 창출할 핵심기술로 대두되었다. 미국 등 주요 선도 국가들은 3D 프린팅을 국방 분야에 적극 확대해 나가고 있으며, 우리나라 역시 3D 프린팅의 군사적 활용을 위해 국방 수리부품 생산기술 확보 및 국방전문인력 양성을 추진하고 있다. 이에 본 논문은 기존의 무기체계 개발단계, 양산단계, 운영유지단계의 부품 국산화 개발관리 절차를 활용하여 향후 신뢰성 있는 3D 프린팅 수리부품을 효율적으로 작전현장에 적용하기 위한 방안을 제시하였다.

• 한국기계가공학회지
• /
• 제18권2호
• /
• pp.82-90
• /
• 2019

In this paper, the effects of different 3D printing conditions including oil lubrication and annealing are observed for their effects on tensile testing. In 3D printing, a press-out extrude filament is rapidly heated and cooled to create internal stress in the printed part. The 3D printing internal stress can be removed using oil-coated filament and annealing. During the oven cooling at an annealing temperature of $106^{\circ}C$, the stress of the specimens with laminated angle $0^{\circ}$ tends to increase by 12.6%, and that of the oil-coated filament printing specimens is increased by 17%. At the annealing temperature of $106^{\circ}C$, the stress of the oil-coated filament printing specimens tends to increase by 35%. In this study, we have found that the oil lubrication and annealing remove the internal stresses and increase the strength of the printed specimens. The oil lubrication and annealing reform the crystalline structures to even out the areas of high and low stress, which creates fewer fragile areas. These results are very useful for the manufacture of 3D printing products with a suitable mechanical strength for applications.

• 한국기계가공학회지
• /
• 제14권4호
• /
• pp.134-139
• /
• 2015

PolyJet technology is an additive manufacturing (AM) technology commonly used for modeling, prototyping, and production applications. It is one of the techniques used for 3D printing. The PolyJet technique is a process that joins materials to fabricate a product from 3D CAD data in a layer-by-layer manner. The orientation of a layer can affect the mechanical properties of the product manufactured by the PolyJet technique because of its anisotropy. In this paper, tensile and shearing tests of specimens were developed with the PolyJet technique in order to study the mechanical properties according to the orientation of a layer. The mechanical properties of the specimens were determined on the basis of true stress-strain curves from tensile and shearing tests. In addition, the tensile and shearing tests were simulated under the same conditions as those of experiment, and the experiment and simulated results were compared. Through this study, the fracture criteria could be established.

• 한국기계가공학회지
• /
• 제14권6호
• /
• pp.142-148
• /
• 2015

3D printing technology is a promising technique for fabricating complex 3D architectures based on the CAD/CAM system, and it has been extensively investigated to manufacture structures in the fields of mechanical engineering, space technology, automobiles, and biomedical and electrical applications. Recent advances in the 3D printing of soft structures have received attention for the application of the construction of flexible sensors of soft robotics or the recreation of tissue/organ-specific microenvironments. In this review paper, we would like to focus on delivering state-of-the-art fabrication of soft structures with 3D printing technology and its various applications.

• 한국생산제조학회지
• /
• 제24권3호
• /
• pp.334-341
• /
• 2015

This paper summarizes the results of an investigation into the environmental factors that have an indirect impact on parts quality, as well as those process variables and modeling information that have a direct impact. The effects of strength, surface hardness, roughness, and accuracy of shape, that is, qualities that users generally need to know, were evaluated with laminating direction experimentally. The 3D printing methods used in this experiment were fused deposition modeling (FDM), stereolithography apparatus (SLA), selective laser sintering (SLS), 3D printing (3DP) and laminated object manufacturing (LOM). The goal was to achieve a high standard of quality control and product quality by optimizing the fabrication process.

• 대한기계학회논문집A
• /
• 제30권3호
• /
• pp.231-240
• /
• 2006

Immersive virtual reality (VR) for the manufacturing planning helps to shorten the planning times as well as to improve the quality of planning results. However, VR equipment is expensive, both in terms of development efforts and device. Engineers also spend time to manually repair erroneous 3-D shape because of imperfect translation between 3-D engineering CAD model and VR system format. In this paper a method is proposed to link 3-D engineering CAD model to a multichannel visualization system with PC clusters. The multichannel visualization module enables distributed computing for PC clusters, which can reduce the cost of VR experience while offering high performance. Each PC in a cluster renders a particular viewpoint of a scene. Scenes are synchronized by reading parameters from the master scene control module and passing them to client scenes.

• 한국기계가공학회지
• /
• 제21권4호
• /
• pp.60-69
• /
• 2022

To keep pace with Industry 4.0, it is imperative for companies to redesign their working environments by adopting robotic automation systems. Automation lines are facilitating the latest cutting-edge technologies, such as 3D vision and industrial robots, to outdo competitors by reducing costs. Considering the nature of the manufacturing industry, a time-saving workflow and smooth linkwork between processes is vital. At Dellics, without any additional new installation in the automation lines, only a few improvements to the working process could raise productivity. Three requirements are the development of gripping technology by utilizing a 3D vision system for the recognition of the material shape and location, research on lighting projectors to target long distances and high illumination, and testing of algorithms/software to improve measurement accuracy and identify products. With some of the functional requisites mentioned above, improved robotic automation systems should provide an improved working environment to maximize overall production efficiency. In this article, the ways in which such a system can become the groundwork for establishing an unmanned working infrastructure are discussed.