• Title/Summary/Keyword: Mold manufacturing

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A Study on the Modeling of Spur and Helical Gear based on Mathematical Algorithm (수학적 알고리즘에 기초한 스퍼기어 및 헬리컬 기어 모델링에 관한 연구)

  • 김태호;이승수;김민주;전언찬
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2002.04a
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    • pp.28-31
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    • 2002
  • In this study, we develop automatic design program, which create 3D model of spur gear and helical gear used VisuaILISP and create helical gear in the CATIA using 2D profile of gear. This model become the standard model, which give not only in itself mold information but also computer processed product with measuring date. Spur gear require mathematical examination of involute curve and trocoidal fillet curve. Automatic design program, which have a mathematical development create the profile of spur gear.

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A Study on Grinding Characteristics of Aspherical Glass Lens core of High-pixel Digital Camera in Diamond Grinding Process (고화소 디지털 카메라 비구면 Glass렌즈 초정밀연삭 특성에 관한 연구)

  • 현동훈;이승준
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.12 no.2
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    • pp.31-36
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    • 2003
  • Electronic or measuring instruments equipped with aspherical lens have recently been used since aspherical lens is more effective than spherical one. for the mass production of aspherical lenses, specific molds with precisely machined cores should be prepared. Some researches on the aspherical lens machining have been carried out to date. However, ultra-precise finding of aspherical or mold core has not been fully studied. In this study, the ultra-precise grinding and evaluating system were established to investigate the finding characteristics of aspherical lenses. Unlike conventional grinding process, since a highly-precise lathe were operated in a clean room without vibration the experimental results can be very useful for further studies on ultra-precise grinding process.

Effect of Tool Approaching Path on He Shape of Cylindrically Milled Parts (공구 접근 경로가 원통형상의 밀링가공물에 미치는 영향)

  • Kim, Kang
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.12 no.3
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    • pp.45-51
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    • 2003
  • Milling process has beer used in aircraft, auto-component and mold industries widely. They need more accurate and precise parts to improve the performance and quality of their products. So, the geometrical form accuracy of the workpiece surface generated by this process is getting more and more important. Generally, the form accuracy is affected by machine conditions, cutting conditions, tool geometry, tool deflection by cutting force and tool path md so on. Even though they are controlled as perfect conditions, it is easily found that there is a line along the axis of a cylindrically milled part. It is presumed that the tool approaching causes this error on milled surface. Thus, the study for investigating the effect of the tool approaching path on the cylindrical surface geometry of the end-milled part is carried out.

A Study on the Fabrication of Nano Pattern using a Nickel Stamper Replicated from Anodic Aluminum Oxide (Anodic Aluminum Oxide 기반 니켈 스탬퍼를 이용한 나노패턴 성형에 관한 연구)

  • Kim, S.;Kim, J.S.;Hong, S.K.;Kim, H.J.;Yoon, K.H.;Kang, J.J.
    • Transactions of Materials Processing
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    • v.20 no.1
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    • pp.23-28
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    • 2011
  • For the fabrication of nano patterned products manufacturing a nano patterned mold is needed in advance. The nano patterned stamper was fabricated by electroforming the AAO master with nickel. The surface of nickel-plated stamper had nano-patterned holes with the diameter of 73 nm and the depth of 83 nm. Hot embossing was used for forming P3HT sheet and the process factors of hot embossing were closer as pressure, temperature and time. In the present paper hot embossing experiments were performed to find the main process conditions to affect the replication ratio of nano patterns on surface of P3HT sheet. As a result, main contributing factors for the replication ratio of hot embossed pattern could be sequentially enumerated as pressure, temperature and time.

Machined Profile Characteristics for Feedrate Change in Ball End Mill Cutting (볼엔드밀 가공시 이송변화에 따른 가공형상 특성)

  • 왕덕현;김원일;이윤경;임채열;우정윤;박창수
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.11 no.2
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    • pp.95-102
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    • 2002
  • Due to the development of the CNC machine tool and CAM software, sculptured surface machining can be broadly used in die and mold industries and ball end milling process is often used for the sculptured surface machining. It is found out how feedrate affects the precision of the machining and also tried to study the most suitable feedrate in specific cutting condition. Two eddy current sensors were used far measuring tool deflections of X, Y axis, dynamometer for cutting force and roundness tester for roundness. It was found that the tool deflection is getting better as tool path is going to further from the center of convex surface. The reason is that the cutting force is increased as the tool approaches to the center. Examining the roundness, cutting force and tool deflection characteristics, it was found that the most suitable feedrate is 90mm/min in convex surface and 120mm/min in concave surface.

A Study on the Optical communication part Lid glass manufacture technology by high temperature and compression molding (광통신 부품 Lid glass 고온압축성형의 관한 연구)

  • Jang, K.C.;Lee, D.G.;Jang, H.
    • Proceedings of the KSME Conference
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    • 2007.05a
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    • pp.1526-1531
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    • 2007
  • Data transmission capacity that is required in 2010 is forecasted that increase by optical communication capacity more than present centuple, and is doing increased demand of optical communication related industry product present. Specially, Lid glass' application that is one of optical communication parts is used in optical communication parts manufacture of Fiber array, Ferrule array, Fanout Black, Silica optical waveguide chip and splitter etc. Also, it is used widely for communication network system, CATV, ATM-PON, FTTH and system. But, Lid glass need much processing times and becomes cause in rising prices of optical communication parts because production cost is expensive. The objectives, of this work is to suggest the micro concave and convex pattern manufacturing technology on borosilicate plate using high temperature and compression molding method. As a result, could developed micro pattern Mold more than 5 pattern, and reduce Lid Glass manufacture cycle time.

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Develvopment of Infeed Grinding Machine and Its Effects on Spherical Surface Grinding (구면 전용 Infeed 연삭기의 개발과 성능평가)

  • 이상직;정해도;최헌종
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1995.10a
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    • pp.1028-1032
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    • 1995
  • This paper describes the manufacture of spherical and aspherical surface on glass, superalloy and ceramic components. The rotationally symmetricallenses, and the ceramic or superalloy molds with spherical shapes are mainly generated by cutting processes on CNC lathe machine or 4,5 axis CNC machining centers. Recently, spherical shape parts require more precise and efficent machining technologies for wide material range such as optical lens of the lithography device in semiconductor manufacturing processes or the high precision mold machining of anti-chemical, anti-wear materials. In this paper, we introduce a newly developed infeed grinding machine with metal with metal bonded cup type wheel and its effects on spherical surface grinding.

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Machining condition monitoring for micro-grooving on mold steel using fuzzy clustering method (퍼지 클러스터링을 이용한 금형강에 미세 그루브 가공시 가공상태 모니터링)

  • 이은상;곽철훈;김남훈
    • Journal of the Korean Society for Precision Engineering
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    • v.20 no.11
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    • pp.47-54
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    • 2003
  • Research during the past several years has established the effectiveness of acoustic emission (AE)-based sensing methodologies for machine condition analysis and process. AE has been proposed and evaluated for a variety of sensing tasks as well as for use as a technique for quantitative studies of manufacturing process. STD11 has been known as difficult-to-cut materials. The micro-grooving machine was developed for this study and the experiments were performed using CBN blade for machining STD11. Evaluating the machining conditions, frequency spectrum analysis of acoustic emission (AE) signals according to each conditions were applied. Fuzzy clustering method for associating the preprocessor outputs with the appropriate decisions was followed by frequency spectrum analysis. FFT is used to decompose AE signal into different frequency bands in time domain, the root mean square (RMS) values extracted from the decomposed signal of each frequency band were used as features.

Processing of Barrier Ribs of PDP Using an UV-curable Paste (광경화성 페이스트를 이용한 PDP 격벽 형성 연구)

  • Kim Yoo-Seong;Koh Tae-Gum;Kim Yong-Seog
    • Journal of Powder Materials
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    • v.13 no.3 s.56
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    • pp.211-216
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    • 2006
  • In an attempt to reduce processing cost and to improve resolution of PDPs, micro mold transfer processing route for barrier ribs of plasma display panel was attempted. In this study, the parameters that may cause defects during the process were identified, which include the shrinkage during UV curing process, stress due to evaporation of organic components, and sintering shrinkage. Considering such parameters, UV curable paste was developed and barrier ribs of PDPs were successfully processed via the process. This work demonstrated the possibility of build-up route in manufacturing barrier ribs of PDP.

Wear properties of Al-Pb alloys produced by a forced stirring method (강제교반법으로 제조된 Al-Pb계 베어링 합금의 마모특성)

  • 임화영;허무영;임대순
    • Tribology and Lubricants
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    • v.8 no.1
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    • pp.70-77
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    • 1992
  • Al-Pb-Si bearing alloys were produced by a forced stirring method and a rapid solidification process to study wear properties of bearing alloys. A homogeneous distribution of Pb particles in Al matrix could be obtained by means of the forced stirring and the rapid cooling during the casting. The wear properties of bearing alloys were tested by a pin-on-disc wear tester. The change in microstructure according to the alloy manufacturing variables was observed by the backscattered electron images. Al-Pb and Al-Si binary alloys showed a transition from mild to severe wear. The transition was not found in Al-Pb-Si ternary alloys. It could be concluded that the lubricatioin effect of Pb and the strengthening effect of Si in the ternary alloys enhanced the bearing properties. A Al-25%Pb-13%Si alloy showed the lowest coefficient of friction in this experiment. It indicated that the optimum concentration of alloy was 25% Pb and 13% Si when the forced stirring of melt and water-cooled-copper-mold solidification were adopted.