• Title/Summary/Keyword: 선삭 공정

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A study on size variation of micro-pattern according to turning radius of workpiece in diamond turning with controlled random cutting depth (절삭 깊이의 무작위 제어를 적용한 다이아몬드 선삭공정에서 소재회전 반경에 따른 미세패턴의 크기변화 분석 연구)

  • Jeong, Ji-Young;Han, Jun-Se;Choi, Doo-Sun;Je, Tae-Jin
    • Design & Manufacturing
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    • v.14 no.1
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    • pp.63-68
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    • 2020
  • Ultra-high brightness and thin displays need to optical micro-patterns which can uniformly diffuse the lights and low loss. The micro random patterns have characteristics to rise the optical efficiency such as light extraction, uniform diffusion. For this reason, various fabrication processes are studied for random patterns. In this study, the micro random patterns were machined by diamond turning which used a controlled cutting tool path with random cutting depth. The machined patterns had random shape and directionality along the circumferential direction. The average width and length of machined random pattern according to rotation radius were 40.13㎛~55.51㎛ and 37.25㎛~59.49㎛, and these results were compared with the designed result. Also, the machining error according to rotation radius in diamond turning using randomly controlled cutting depth was discussed.

A Study on Laser Assisted Machining for Silicon Nitride Ceramics (I) - Preheating Characteristics and Oxidation Behaviors of Silicon Nitride Ceramics with Machining Parameters - (질화규소 세라믹의 레이저 예열선삭에 관한 연구 (I) - 공정변수에 따른 질화규소의 예열특성 및 산화거동 -)

  • Kim, Jong-Do;Lee, Su-Jin;Shu, Jeong;Lee, Jae-Hoon
    • Journal of Welding and Joining
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    • v.28 no.4
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    • pp.61-66
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    • 2010
  • Silicon nitride is widely used as an engineering ceramics because it has high strength, abrasion resistance and corrosion resistance even at high temperature. However, machining of silicon nitride is difficult due to its high hardness and brittleness. Laser assisted machining(LAM) allows effective cutting using CBN tool by locally heating the cutting part to the softening temperature of YSiAlON using the laser beam. The effect of preheating depending on process parameters were studied to find out the oxidation mechanism. If silicon nitride is sufficiently preheated, the surface is oxidized and $N_2$ gas is formed and escapes from the material, thereby making the cutting process more advantageous. During laser preheating process before machining, high temperature results in strong oxidation which makes the bloating, silicate layers and micro cracks. Using the results of these experiments, preheating characteristics and oxidation behavior were found out.

A Study on Worker Risk Reduction Methods using the Deep Learning Image Processing Technique in the Turning Process (선삭공정에서 딥러닝 영상처리 기법을 이용한 작업자 위험 감소 방안 연구)

  • Bae, Yong Hwan;Lee, Young Tae;Kim, Ho-Chan
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.20 no.12
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    • pp.1-7
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    • 2021
  • The deep learning image processing technique was used to prevent accidents in lathe work caused by worker negligence. During lathe operation, when the chuck is rotated, it is very dangerous if the operator's hand is near the chuck. However, if the chuck is stopped during operation, it is not dangerous for the operator's hand to be in close proximity to the chuck for workpiece measurement, chip removal or tool change. We used YOLO (You Only Look Once), a deep learning image processing program for object detection and classification. Lathe work images such as hand, chuck rotation and chuck stop are used for learning, object detection and classification. As a result of the experiment, object detection and class classification were performed with a success probability of over 80% at a confidence score 0.5. Thus, we conclude that the artificial intelligence deep learning image processing technique can be effective in preventing incidents resulting from worker negligence in future manufacturing systems.

LED Beam Shaping and Fabrication of Optical Components for LED-Based Fingerprint Imager (LED 빔조형에 의한 초소형 이미징 장치의 제조 기술)

  • Joo, Jae-Young;Song, Sang-Bin;Park, Sun-Sub;Lee, Sun-Kyu
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.36 no.10
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    • pp.1189-1193
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    • 2012
  • The Miniaturized Fingerprint Imager (MFI) is a slim optical mouse that can be used as an input device for application to wireless portable personnel communication devices such as smartphones. In this study, we have fabricated key optical components of an MFI, including the illumination optical components and imaging lens. An LED beam-shaping lens consisting of an aspheric lens and a Fresnel facet was successfully machined using a diamond turning machine (DTM). A customized V-shaped groove for beam path banding was fabricated by the bulk micromachining of silicon that was coated with aluminum using the shadow effect in thermal evaporation. The imaging lens and arrayed multilevel Fresnel lenses were fabricated by electron beam lithography and FAB etching, respectively. The proposed optical components are extremely compact and have high optical efficiency; therefore, they are applicable to ultraslim optical systems.