• Title/Summary/Keyword: High-Efficiency Machining

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Experimental Investigation on Machining Feasibility of Micro Patterns using a Single Crystal Diamond Tool (단결정 다이아몬드 공구를 이용한 미세 패턴 가공성에 대한 실험적 분석)

  • Kim, Hyun-Chul
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.11 no.5
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    • pp.76-81
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    • 2012
  • 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.

The Characteristics of Ultra Precision Machining of Optical Crystals for Infrared Rays (적외선용 광학소자의 초정밀 절삭특성)

  • Won, Jong-Ho;Park, Won-Kyoo;Kim, Ju-Hwan;Kim, Geon-Hee
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.2 no.1
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    • pp.57-62
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    • 2003
  • Machining technique for optical crystals with single point diamond turning tool is reported in tills paper. The main factors influencing the machined surface quality are discovered and regularities of machining process are drawn. Optical crystals have found more and more important applications in the field of modern optics. Optical crystals are mostly brittle materials of poor machinability The traditional machining method is polishing which has many shortcomings such as low production efficiency, poor ability to be automatically controlled and edge effect of the workpiece. SPDT has been widely used in manufacturing optical reflectors of non-ferrous metals such as aluminum and copper which are easy to be machined for their proper ductility. But optical crystals being discussed here are characterized by their high brittleness which makes it difficult to obtain high quality optical surfaces on them. The purpose of our research is to find the optimum machining conditions for ductile cutting of optical crystals and apply the SPDT technique to the manufacturing of ultra precision optical components of brittle materials. As a result, the cutting force is steady, the cutting force range is 0.05-0.08N. The surface roughness is good when spindle is above 1400rpm, and feed rate is small. The influence of depth of cut is very small.

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A Study on the Selection of Grinding Conditions and Evaluation for Curvic Coupling Tooth Machining (Curvic Coupling Tooth 가공의 연삭 조건 선정 및 가공면 평가에 관한 연구)

  • Hur, Du-Kwon;Kim, Myung-Hyun;Kim, Chan Kyu;Jeong, Young Cheol;Jung, Yoon Gyo;Cho, Young Tae
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.17 no.3
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    • pp.87-92
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    • 2018
  • As gas turbines for power generation become increasingly more important for high capacity and high efficiency, the technological development and investment of companies are increasing globally. Gas turbine manufacturing technology is only owned by a few companies such as GE, Siemens, and MHI, and our country currently depends on imports of processing technology and component parts. The core part of the gas turbine is curvic coupling tooth processing technology that improves turbine efficiency by smoothly transmitting power to the turbine rotor. Curvic coupling tooth machining and evaluation research is restricted overseas, and it is not underway in Korea. Therefore, in this study, roughing and finishing process technology for curvic coupling tooth machining is developed and a quantitative evaluation method is proposed. For the development of machining technology, the analysis of critical parameters was performed through C & E analysis. In the roughing process, the conditions considering the minimum machining time and tool load ratio were determined. Finishing process conditions were determined based on the contact ratio between the tooth surfaces. The image-processing method is presented for evaluation of the contact ratio and a verification test was performed.

Study on Machining High-Aspect Ratio Micro Barrier Rib Array Structures using Orthogonal Cutting Method (2 차원 평판가공법을 이용한 고세장비 미세 격벽어레이구조물 가공)

  • Park, Eun-Suk;Choi, Hwan-Jin;Kim, Han-Hee;Jeon, Eun-Chae;Je, Tae-Jin
    • Journal of the Korean Society for Precision Engineering
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    • v.29 no.12
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    • pp.1272-1278
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    • 2012
  • The micro barrier rip array structures have been applied in a variety of areas including as privacy films, micro heat sinks, touch panel and optical waveguide. The increased aspect ratio (AR) of barrier rip array structures is required in order to increase the efficiency and performance of these products. There are several problems such as burr, defect of surface roughness and deformation and breakage of barrier rip structure with machining high-aspect ratio micro barrier rip array structure using orthogonal cutting method. It is essential to develop technological methods to solve these problems. The optimum machining conditions for machining micro barrier rip array structures having high-aspect ratio were determined according to lengths ($200{\mu}m$ and $600{\mu}m$) and shape angles ($2.89^{\circ}$ and $0^{\circ}$) of diamond tool, overlapped cutting depths ($5{\mu}m$ and $10{\mu}m$), feed rates (100 mm/s) and three machining processes. Based on the optimum machining conditions, micro barrier rib array structures having aspect ratio 30 was machined in this study.

Improvement of Manufacturing Process for Fuel Oil Supply Pipe using Large Vessel (대형선박용 연료공급관 가공공정 개선)

  • Jeon, Eon-Chan;Han, Min-Sik;Kim, Nam-Hun;Min, Jung-Oh
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.9 no.5
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    • pp.64-69
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    • 2010
  • This study is the machining of fuel supply pipe used in large vessels. The fuel supply pipe of large vessels have effects to reduce engine exhaust because of common rail system and show excellent fuel efficiency so it is in the limelight as a vessel engine of next generation. At present, the shape of fuel supply pipe of common rail used for huge two-stroke & low-speed vessels is like a peanut hole so the second machining is necessary after the first machining. There is high error rate for machining and the materials waste caused by machining error is serious. Also, in this time the request for increasing the length of fuel supply pipe is suggested in the world market, it's judged that current methods will show higher error rate for machining. Therefore, the purpose of this study is to improve the machining process used originally. For that, the system controlling the process was developed as well as surface roughness and straightness which are evaluation items of fuel supply pipe were measured so that improved process can be observed in real time.

A Study on Mirror-like Polishing of Brittle Material by Elastic Emission Machining (탄성방출가공법에 의한 경취재료의 경면 폴리싱에 관한 연구)

  • 남성호;김정두
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1997.04a
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    • pp.1009-1014
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    • 1997
  • The small material removal rate of elastic emission machinong (EEM) becomes a serious problem due to using fine powder particles for obtaining finished of high quality. If a cylindrical polyurethane-wheel is used as a tool for accelerating powder particles, the efficiency of machining may be increased through enlarging the machining regionand increasing the surface velocity of the wheel. If these analyicl results are compared with experimental ones, characteristics of EEM using polyurethan-wheel can be clarified. In this study, effects of EEM using cylindrical polyurethane-wheel on the surface roughness and the material removal rate were verified through polishing of the brittle material under various conditions. The high-efficient polishing of silicon wafer has been also carried out using this method.

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A Study on Optimization for Static Characteristics Analysis of Gantry-Type Machining Centers (문형머시닝센터의 구조해석을 통한 최적화에 관한 연구)

  • Yoo, Deck-Sang
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.14 no.6
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    • pp.122-128
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    • 2015
  • Recently, as the demand for high efficiency, multi-function machine tools has increased, domestic machine tool industries are investing in research and development for Gantry-Type Machining centers. In this thesis, for the purpose of evaluating machining accuracy and designing a machine tool structure, a simplified model of the main frame is suggested. The results show the general characteristics of the optimum design, and the approach is shown as practicable for the preliminary design analysis and improvement of a conceptual design of a Gantry-Type Machining center. This paper's results are expected to improve the static characteristics of Gantry-Type Machine centers. The three-dimensional finite element models proved that the modeling method might be applied to real machine tool structures.

Development of the cutting simulation system with decomposition Algorithm. (분해 모델링 기법을 이용한 절삭 시뮬레이션 시스템 개발)

  • 김용현;고성림
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2004.10a
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    • pp.422-425
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    • 2004
  • This paper develops an octree-based algorithm for machining simulation. Most commercial machining simulators are based on the Z map model, which has several limitations in terms of achieving a high level of precision in five-axis machining simulation. Octree representation being a three-dimensional (3D) decomposition method, an octree-based algorithm is expected to be able to overcome such limitations. With the octree model, storage requirement is reduced. Moreover, recursive subdivision is processed in the boundaries, which reduces useless computations. The supersampling method is the most common form of antialiasing and is typically used with polygon mesh rendering in computer graphics. The supersampling technique is being used to advance the efficiency of the octree algorithm..

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A Study on the Cylindrical Grinding Technology by Electrolytic In-Process Dressing(ELID) Method (전해인프로세스드레싱법에 의한 초정밀 원통 연삭기술 연구)

  • Je, Tae-Jin;Lee, Eung-Suk
    • 연구논문집
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    • s.28
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    • pp.59-71
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    • 1998
  • The ELID(electrolytic in-process dressing) grinding method is a new precision grinding technique with the special electrolytic in-process dressing by metal bonded grinding wheel, fluid, and power supply. It is possible to make a efficient precision machining of hard and brittle materials such as ceramics, hard metals, and quenched steels by using this method, In this study, a new efficient precision grinding method with ELID was attempted for application to the machining and finishing processes of cylindrical structural components. And, we try to develop the cylindrical grinding technique for mirror surface of ceramics, tungsten carbide and SCM steel, and for the high efficiency grinding of machined parts, for example, ball screw shaft. Electrical characteristics of three different wheel grit sizes of #325, #2000 and #4000 were investigated experimentally. ELID grinding method is proved to be useful for mirror surface generation and efficient machining.

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A Case Study on Reliability Analysis of Machining Center (머시닝센터의 신뢰성 분석 사례)

  • 이현용;박종권;송준엽
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2001.04a
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    • pp.418-421
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    • 2001
  • For insuring and guaranteeing the quality and efficiency of machine tool from design phase, we studied the reliability analysis and design review method. We researched the feasibility study machining center with the proposed procedure and described the analysis outputs. From this study will contribute to guide and introduce the reliability design in developing and producing phase of high quality product.

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