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금속 적층 기반 하이브리드 머시닝센터의 경량화를 위한 형상 최적화에 관한 연구
정원용(Won-Young Jeong),정호인(Ho-In Jeong),이춘만(Choon-Man Lee) 한국기계가공학회 2021 한국기계가공학회지 Vol.20 No.2
In the fourth industrial revolution, the demand for metal three-dimensional (3D) printing technology is rapidly increasing. Metal 3D printing is an efficient method for manufacturing products because the method reduces material waste compared to subtractive manufacturing. In addition, products with complex shapes, such as turbine blades, can be easily produced using metal 3D printing because the method offers a high degree of freedom. However, due to the long production time of metal 3D printing, mass production is impossible, and post-processing is necessary due to its low precision. Therefore, it is necessary to develop a new hybrid process that can efficiently process metals and to develop a metal 3D-printing-based hybrid processing system technology to secure high processing precision and manufacture complex shapes. In this study, the structural stability of a metal 3D printer based hybrid machining center was analyzed through structural analysis before its development. In addition, we proposed a design modification that can reduce the weight and increase the stiffness of the hybrid machining center by performing shape lightning based on the structural analysis results.
다구찌 기법을 이용한 CFRP의 최적 드릴링 조건 선정에 관한 연구
정호인(Ho-In Jeong),이춘만(Choon-Man Lee),김동현(Dong-Hyeon Kim) 대한기계학회 2021 大韓機械學會論文集A Vol.45 No.12
최근 차량 및 항공산업의 발달에 따라 경량화를 통한 연료 소비 및 배기가스 배출량 감소에 관한 관심이 높아지고 있다. 탄소섬유 복합재(CFRP: carbon fiber reinforced plastics)는 고강도 경량 소재로 차량 및 항공산업에 활용되고 있으나, 차체 및 기체 일부에만 적용되고 있는 실정으로, 철강 소재와 CFRP의 체결을 위해 드릴링 가공이 주로 이루어지고 있다. CFRP는 가공 시 가공물 미절삭, 박리현상, 섬유 분리등의 가공결함이 주로 발생하는 난삭재로 이러한 가공결함을 줄이기 위한 가공조건 최적화에 관한 연구가 필요하다. 본 연구에서는 CFRP 드릴링 시 다구찌 기법(Taguchi method)을 사용하여 절삭력 및 가공품질에 따른 주요 인자를 분석하고 최적 가공조건을 선정하였다. With recent developments in automobile and air mobility industries, reducing fuel consumption and exhaust gas emissions through weight reduction has become increasingly popular. Carbon fiber reinforced plastic (CFRP) is a high-strength and lightweight material that is used in automobile and air mobility industries. However, CFRP is only applied to body parts of automobiles and air mobility vehicles. CFRP is a difficult-to-cut material that causes certain machining defects, such as uncut fiber, delamination, and fiber pullout during processing. Therefore, research on optimizing the machining conditions is necessary to reduce these machining defects. In this study, the Taguchi method was used during CFRP drilling to analyze the major factors affecting cutting force and machining quality. Furthermore, the machining conditions of CFRP were optimized.
다구찌법을 이용한 석영의 최적 가공조건 선정에 관한 연구
정호인(Ho-In Jeong),최성준(Seong-Jun Choi),이춘만(Choon-Man Lee) 한국기계가공학회 2022 한국기계가공학회지 Vol.21 No.2
Quartz (SiO2) has high abrasion and heat resistances and excellent chemical and mechanical properties; therefore, it is used in various industries, such as machinery, chemistry, optics, and medicine. Quartz is a high-hardness and brittle material and is classified as the topmost difficult-to-cut material, which is because of the cracking or chipping at the edge during processing. Corner wear, such as cracks and chippings that occur during cutting, is a major cause for the deterioration in the machining quality. Therefore, many researchers are investigating various techniques to process quartz effectively. However, owing to the mechanical properties of quartz, most studies have been conducted on grinding, micromachining, and microdrilling. Few studies have been conducted on quartz processing. The purpose of this study was to analyze the machining characteristics according to the machining factors during the slot machining of quartz using a cubic boron nitride (CBN) tool and to select the optimal machining conditions using the Taguchi method. The machining experiment was performed considering three process variables: the spindle speed, feed rate, and depth of cut. The cutting force and surface roughness were analyzed according to the processing conditions.
공작기계용 볼스크류의 신뢰성 확보를 위한 발열 및 열변위 분석에 관한 해석적 연구
정호인(Ho-In Jeong),김민재(Min-Jae Kim),최유준(You-Jun Choi),김현구(Hyeon-Gu Kim),이춘만(Choon-Man Lee) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
The demand for high-precision production equipment is increasing with the recent increase in demand for precision production, which is emerging due to the 4th industrial revolution. Prior to developing domestic precision production equipment that satisfies this trend, develop element technologies and evaluation criteria that can be commonly used to secure technological competitiveness and prove the reliability of domestic precision production equipment, and apply them to precision production equipment. It is necessary to study the standards of an overview evaluation system to prove the technological competitiveness of domestic manufacturing equipment by verifying the usability of the development system. In this study, before developing the technical standards and system for reliability evaluation of domestic precision production equipment, a ball screw was selected as a core part of domestic precision production equipment. In addition, to secure the reliability of the ball screw selected as a key component, the thermal displacement and temperature are measured according to the operating conditions. And the thermal displacement and temperature according to the operating conditions calculated through the analysis model are compared and analyzed to verify the analysis model.