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초정밀가공의 재질에 따른 발열과 가공정밀도에 관한 연구
이경일(Gyung-Il Lee),김재열(Jae-Yeol Kim) 한국기계가공학회 2018 한국기계가공학회지 Vol.17 No.1
At present, ultra-precision cutting technology has been studied in Korean research institutes, focusing on development of ultra-precision cutting tool technology and ultra-precision control engineering. However, the developed technologies are still far behind advanced countries. It focuses on metals including aluminum, copper and nickel, and nonmetals including plastics, silicone and germanium which require high precision while using a lathe. It is hard to implement high precision by grinding the aforementioned materials. To address the issue, the ultra-precision cutting technology has been developing by using ultra-precision machine tools very accurate and strong, and diamond tools highly abrasion-resistant. To address this issue, this study aims to conduct ultra-precision cutting by using ECTS (Error Compensation Tool Servo) to improve motion precision of elements and components, and compensate for motion errors in real time. An IR camera is used for analyzing cutting accuracy differences depending on the heat generated in diamond tools in cutting to examine the heat generated in cutting to study cutting accuracy depending on generated heat.
김석원(S. W. Kim),김상기(S. K. Kim),정우섭(W. S. Jung),이채문(C. M. Lee),이득우(D. W. Lee) 한국정밀공학회 2004 한국정밀공학회 학술발표대회 논문집 Vol.2004 No.10월
In recent years, a demand for micro-structure machining is increasing by the development of information and optics industries. Micro machining technology is in general well known in the field of lithograghy. However, the requirement of producing micro machine and/or micro mechanism with metal materials will be increased since a variety of workpiece configurations can be easily made. In this paper, ultra precision machine is developed to obtain micro groove and mirror surface using single crystal diamond tool. According to the cutting experiment, no burr was found at the edge of V-grooves, and the surface roughness of copper is about 1~3㎚ Ra. It is verified that ultra precision machine is effective to high precision machining.
양순철(Sun-Choel Yang),김상혁(Sang-Hyuk Kim),허명상(Myung-Sang Huh),장기수(Ki-Soo Chang),박순섭(Soon-Sub Park),원종호(Jong-Ho Won),김건희(Geon-Hee Kim) 한국기계가공학회 2012 한국기계가공학회지 Vol.11 No.2
Ultra Precision Machining Techniques, such as manufacturing Micro Lens Array(MLA), off-axis mirror, F-θ lens for laser printer, are achieved, based on technologies in consequence of development of modern high-precision machining mechanism. Above all, FTS(Fast Tool Servo) and STS(Slow Tool Servo) are more innovative technologies for reducing time and development costs. In this paper, it is described that MLA machining technique by FTS, off-axis mirror machining technique by STS, optics for observing space, and development of infrared aspheric lens for a thermal imaging microscope.
초정밀 FTS 시스템을 이용한 CNC Lathe 스핀들 이송오차 보상 및 가공정밀도 향상
김재열(JaeYeol Kim),곽남수(Namsu Kwak) 한국트라이볼로지학회 2011 한국트라이볼로지학회지 (Tribol. Lubr.) Vol.27 No.1
The ultra-precision products which recently experienced high in demands had included the large areas of most updated technologies, for example, the semiconductor, the computer, the aerospace, the media information, the precision machining. For early 21st century, it was expected that the ultra-precision technologies would be distributed more throughout the market and required securing more nation-wise advancements. Furthermore, there seemed to be increasing in demand of the single crystal diamond tool which was capable of the ultra-precision machining for parts requiring a high degree of complicated details which were more than just simple wrapping and policing. Moreover, the highest degree of precision is currently at 50 ㎚ for some precision parts but not in all. The machining system and technology should be at very high performed level in order to accomplish this degree of the ultra-precision.
3D 프린팅 제품의 후처리 가공을 위한 5자유도 로봇 기반 가공시스템 설계 및 가공경로 생성
심재윤,김남현,오대진,홍세림,이원균 대한기계학회 2019 大韓機械學會論文集A Vol.43 No.5
3D printed products are used in many industrial applications. However, poor surface quality and dimensional inaccuracy are chronic problems in 3D printing technologies. In this regard, post-process machining is essential for fabricating precision products using a 3D printer. Time and cost required for post-process machining are crucial factors that deteriorate the productivity of 3D printing. This study developed a robot machining system for post-process machining of 3D printed products, where five degree-of-freedom serial robot arms with a spindle system were designed. The controller is composed of a numeric control kernel and a motion control unit for controlling the cutter location. A tool path generator for generating the target position and posture of the cutter was also designed and evaluated. The surface quality of 3D printed products before and after the post-process machining were compared to verify the feasibility of the proposed robot machining system. 최근 다양한 산업분야에서 3D 프린터를 이용하여 제작된 제품의 활용이 증가하고 있다. 하지만 3D 프린팅 제품은 공정의 특성 상 표면품질과 형상정밀도가 낮다. 따라서 3D 프린팅을 이용하여 정교한 제품을 제작하기 위해 후처리 가공이 필수적이며, 이에 소비되는 시간과 비용은 3D 프린팅 공정의 생산성을 저하시킨다. 본 연구에서는 3D 프린팅 제품의 후처리 가공을 위한 로봇가공시스템을 제안하였다. 5자유도 로봇팔에 스핀들을 부착한 가공시스템을 설계하고, 공구의 위치를 제어하기 위한 제어기를 제작하였다. 공구의 위치와 자세를 결정하여 가공 경로를 생성하는 알고리즘을 제작하고, 그 성능을 검증하였다. 3D 프린팅 제품의 후처리 가공 전과 후의 가공 표면 조도를 비교함으로써 제안한 방법의 성능을 검증하였다.
복합가공기용 초정밀급 새들 가공을 위한 최적의 고정구 개발
김병창(Byoung Chang Kim) 한국기계가공학회 2014 한국기계가공학회지 Vol.13 No.3
The increasing level of demand for multi-tasking machines requires a saddle with an ultra-precise machining accuracy level of 15μm, as such a saddle is one of the main components of these machines. The manner of achieving ultra-precise machining accuracy mainly depends on the fixed forces. In this paper, we optimized the number of contact points and the contact positions to reduce the deformation of the saddle while it is machined. The performance levels of the proposed optimal jig and fixture are determined by measuring the flatness, parallelism and perpendicularity of a machined saddle. The machining accuracy is found to be lower than 15μm at all measured points.
강재훈(Jae-Hoon Kang) 한국기계가공학회 2007 한국기계가공학회 춘추계학술대회 논문집 Vol.2007 No.-
Recently, we have been developing useful micro factory system can be applied to frontier technology industries in long term R&D project combined with five study groups. And press module used for plastic forming process is also regarded as one of the major machining units composed to micro factory system. The purpose of this sub-project is to development and supply proper dies as the downsized machine tools in practice to keep the facilities in good working order of miniaturized press. As the result of this year study, finally ultra-fine stamping die punch using WC-Co alloy with the minimum width size of 120µm for sheet metal forming had been manufactured on trial.
단결정 다이아몬드 공구를 이용한 미세 패턴 가공성에 대한 실험적 분석
김현철(Hyun-Chul Kim) 한국기계가공학회 2012 한국기계가공학회지 Vol.11 No.5
The continuing demand for increasingly slimmer and brighter liquid crystal display(LCD) panels has led to an increased focus on the role of the light guide panels(LGPs) or optical films that are used to obtain diffuse, uniform light from the backlight unit(BLU). And the most basic process in the production of such BLU components is the micromachining. LCD BLUs comprise various optical elements such as a LGP, diffuser sheet, prism sheet, and protector sheet with micro patterns. High aspect ratio patterns are required to reduce the number of sheets and enhance light efficiency, but there is a limit to the aspect ratio achievable for a given material and cutting tool. Therefore, this study comprised a series of experimental evaluations conducted to determine the machining feasibility in microcutting various aspect ratio patterns on electroless nickel plated die materials when using single-crystal diamond tools. Cutting performance was evaluated at various cutting speeds and depths of cut using different machining methods and machine tools.
송창규(C. K. Song),박천홍(C. H. Park),황주호(J. H. Hwang),김병섭(B. S. Kim) 한국정밀공학회 2005 한국정밀공학회 학술발표대회 논문집 Vol.2005 No.10월
In this paper, we discuss the merits of mechanical machining to generate micro features on large surfaces. An overseas technology trend related to the micro machining and dedicated machinery is also presented. We provide an overview of what characteristics the machinery is required to have to generate micro features on large surfaces and what kind of technical barriers need to be overcome to put the technology to practical use.