• Title/Summary/Keyword: diamond machining

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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.

A study on micro grooving characteristics of planar lightwave circuit and glass using ultrasonic vibration cutting (초음파 진동절삭을 이용한 평면 광도파로와 유리의 미세 홈 가공특성에 관한 연구)

  • 이준석;김병국;정융호;이득우
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2002.04a
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    • pp.167-172
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    • 2002
  • Recent years, optical components'are widely used in optical communication industry for high speed and mass storage data processing. Micro grooving of planar lightwave circuit and glass, those are widely used in optical component, are realized by polycrystalline diamond tool with ultrasonic vibration. To know the characteristics of brittle materials cutting, ultrasonic vibration cutting tool and machining system are built for the experiment. Grooving on planar lightwave circuit and glass experiments are performed and their shape are measured by photograph with microscope. It reveals that better groove shape with low chipping of planar lightwave circuit and glass are obtained by micro grooving machining with ultrasonic vibration. These experiments are considered as a possibility to the micro grooving of optical communication components.

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A study on the manufacture of Large Collimation Reflector using SPDT (SPDT를 이용한 대구경 Collimation Reflector 가공 연구)

  • 김건희;홍권희;김효식;박지영;박순섭;원종호
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2002.05a
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    • pp.897-900
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    • 2002
  • The collimation mirror will be used for thermal vacuum testing of spacecraft. The reflection mirror system to generate parallel beam inside the thermal vacuum chamber. A 600mm diameter aspheric Collimation mirror was fabricated by ultra-precision single point diamond turning (SPDT). Aluminum alloy for mirror substrates is known to be easily machining, but not polishable due to its ductility. Aspheric large collimation reflector without a conventional polishing process, the surface roughness of 10nmRa, and the from error of $\lambda/2 ~\lambda/4(\lambda$ =632.8 nm) for reference curved surface 600 mm has been required. The purpose of this research is to find the optimum machining conditions for reflector cutting of A16061-T651 and apply the SPDT technique to the manufacturing of ultra precision optical components of metal aspheric reflector.

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The Control and Motion Characteristics of 5 axis Vacuum Stage for Electron Beam Lithography (전자빔 가공기용 진공 5축 스테이지의 제어 및 운동특성)

  • 이찬홍;박천홍;이후상
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2004.10a
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    • pp.890-893
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    • 2004
  • The ultra precision machining in industrial field are increased day by day. The diamond turning has been used generally, but now is faced with limitation of use, because of higher requirement of production field. The electron beam lithography is alternative in machining area as semiconductor production. For EB lithography, 5 axis vacuum stage is required to duplicate small and large patterns on wafer. The stage is composed of 2 rotational axis and 3 translational axis with 5 DC servo motors. The positioning repeatability and resolution of Z axis feed unit are 3.21$\mu$m and 0.5 $\mu$m/step enough to apply to lithography.

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Micro Turning on Face using Elliptical Vibration Cutting (타원궤적 진동절삭법을 이용한 미세 면선삭)

  • Kim, Gi-Dae;Loh, Byoung-Gook
    • Journal of the Korean Society for Precision Engineering
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    • v.26 no.1
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    • pp.82-88
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    • 2009
  • Ultra-precision turning is highly needed to manufacture molds for precision lens. In this study, micro-turning combined with elliptical vibration cutting (EVC), which is known to enhance micro- machining quality, was investigated by installing a rotary stage into the micro-grooving machine. From machining experiments involving materials of copper, brass, and aluminum and single and poly crystalline diamond tools, it was found that EVC produced thinner and curlier chips and that better surface finish could be achieved, compared with conventional turning, owing to prohibition of formation of burrs and built-up edges. Therefore, we found EVC micro turning could be readily utilized to manufacture precision mold.

Grinding Characteristic of Hard Disk Glass by Glass by ELLD Grinding

  • Kim, Gyung-Nyun;Hitoshi Ohmori
    • International Journal of Precision Engineering and Manufacturing
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    • v.1 no.2
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    • pp.61-66
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    • 2000
  • In this paper, we discuss the machining characteristics of HDD glass. Glass is now being used globally as a data storage device, Such glasses are usually machined by lapping by this technique requires a long machining time, resulting in low productivity, For this reason, we examine the possibility of EILD grinding in HDD glass workpieces, A move to ELID grinding may result in substantial cost reduction. Our purpose is to investigate the grinding characteristics of HDD glass in ELID grinding. The bonding materials for fixing the abrasives of cast iron, cobalt and bronze are applied, and grinding conditions such as rotation speed and feeding are varied. Results show that with the use of ELID, mirror surfaces can be achieved with high efficiency.

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A Study on the Machining Characteristics of Turning Inserts of Lateral Chip Breaker Shape (측면 칩브레이커형 선삭인서트의 가공특성에 관한 연구)

  • Kim, Taeck-Su;Lee, Sang-Min;Cho, Jun-Hyun;Park, Sang-Hyun;Lee, Jong-Chan
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.11 no.2
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    • pp.171-176
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    • 2012
  • So far, carbide insert production technology was carried out using a diamond grinding wheel. This production technology has problem that raise production costs and decrease in productivity. The SIDE PRESS method to solve this problem have been developed. In this paper, the machining characteristics of lateral chip breaker turning inserts produced by the SIDE PRESS method was studied. The cutting force and the resulting surface roughness were measured at various cutting conditions. The experimental results indicate that the chip breaker inserts of three-dimensional geometry is the best cutting performance.

Machining of Micro Structure using Elliptical Vibration Grooving Machine (타원궤적 진동절삭 가공기를 이용한 미세 형상 가공)

  • Kim, Gi-Dae;Loh, Byoung-Gook
    • Journal of the Korean Society for Precision Engineering
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    • v.25 no.11
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    • pp.45-51
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    • 2008
  • Successive micro-scale V-grooves and a grid of pyramids were machined by elliptical vibration tufting (EVC) to investigate feasibility of using EVC as an alternative method of creating micro-molds to photo-lithography and electroforming, which have been commonly employed. An elliptical vibration grooving machine was developed which consists of two orthogonally-arranged piezoelectric actuators, a diamond cutting tool, and a motorized xyz stage. The micro-scale features were machined on materials of copper, duralumin, nickel, and hastelloy and it was found that EVC significantly reduces cutting resistance and prohibits generation of side burrs and rollover burrs, thus resulting in improving machining qualify of micro-molds in ail experimented workpiece materials.

Evaluation of the CNC grinding machine for ultra-precision machining of advanced materials (신소재 경면가공용 CNC 연삭기의 가공성능평가)

  • 김현석
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1994.10a
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    • pp.92-97
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    • 1994
  • The there axis CNC grinding machine tool for ultra-precison mirror surface grinding of advanced materials such as ceramics and other hard and brittle materials was designed and manufactured. The grinding machine is composed of the air spindle, the high damping resin concrete bed, and the three axis CNC controller with the high resolution AC servo motor. To investigate the dynamic properties of the grinding machine, the natural frequencies of the spindle and the headstock were experimentally measured. The truing method using the break truer to revise the shape of the metal bonded diamond wheel was developed. Form the results of the machining using the prototype three axis CNC grinding machine manufactured, the mirror surface were achieved.

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저순도 알루미나 세라믹 가소결재의 피삭성

  • 이재우
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1995.04b
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    • pp.33-38
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    • 1995
  • In this study, unsistered, pre-sintered and sintered low purity alumina ceramics were machined with various tools to clarify the machniability, the optimum tool materials and the optimum tool materials and the optimum cutting conditions. The maon conclusions obtained were as follows. (1) Machined withalloy steel tool, the machinabilty of te pre-sintered ceramics becomes better with the decrease of pre-sintering temperature, but that of unsintered ceramics(white body) was extremely poor. (2) In the case of carbide tool K01, the tool life in machining white body was the longest, and the machinabilty of pre-sintered ceramics becomes poorer with the increase of the pre-sintering temperature. (3) In the case of ceramic tool, the 10000-1100 .deg. C pre-sintered ceramics showed te best machinability within a certain cutting speed range. So far as dry machining, the above combination and conditions showed the highest productivity. (4) When the pre-sintered ceramics were wet machined withsintered diamond tool, the tool life becomes extremelylong, and higher cutting speed can be can be used than in the case offull-sintered ceramics. The productivity of wet cutting is much higher than that ofdry cutting.

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