• 제목/요약/키워드: 선삭 공정

검색결과 54건 처리시간 0.018초

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

  • 정지영;한준세;최두선;제태진
    • Design & Manufacturing
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    • 제14권1호
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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.

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

  • 김종도;이수진;서정;이제훈
    • Journal of Welding and Joining
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    • 제28권4호
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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.

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

  • 배용환;이영태;김호찬
    • 한국기계가공학회지
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    • 제20권12호
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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 빔조형에 의한 초소형 이미징 장치의 제조 기술 (LED Beam Shaping and Fabrication of Optical Components for LED-Based Fingerprint Imager)

  • 주재영;송상빈;박순섭;이선규
    • 대한기계학회논문집A
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    • 제36권10호
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    • pp.1189-1193
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    • 2012
  • 본 연구는 초소형 광학 시스템을 구현할 수 있는 설계 및 제작의 방법론을 제시하고자 한다. 초소형 광학계에서는 조명 및 결상 광학소자의 성능과 소형화가 조광면의 균질도와 결상 된 이미지의 선명도에 중요한 영향을 미치게 된다. 본 연구에서는 얇은 두께로 실효 광도를 배가시키기 위한 초박형의 LED 빔조형 렌즈를 설계 제작하였다. 상기 렌즈는 중앙부의 비구면렌즈와 외각의 전반사 프레넬 가장자리 부로 구성되어 있다. 설계된 LED 빔조형 렌즈(직경 4.7 mm, 두께 0.6 mm)는 다이아몬드 선삭으로 중앙 비구면부의 전반사(TIR) 가장자리가 정밀하게 가공되었으며, LED 의 빔각을 150 도에서 17.5 도로 축소 시켰다. 다른 광학소자들 마이크로 프리즘, 결상광학용 프레넬 렌즈, 광가이드는 다양한 마이크로 나노 크기의 제조공정으로 일체형으로 성형되었다. 시작품으로 제작된 초소형 광학계($6.8{\times}2.2{\times}2.5mm$)는 마이크로 패턴을 결상의 가능성을 보여주었고, 지문인식용 초소형광학계로서의 성능을 검증하였다.