• Title/Summary/Keyword: 마이크로 드릴

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A Study on Micro Drill-Bit Measurement Using Images (영상을 이용한 미세 드릴비트 측정에 관한 연구)

  • Kwak, Dong-gyu;Choi, Han-go
    • Journal of the Institute of Convergence Signal Processing
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    • v.16 no.3
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    • pp.90-95
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    • 2015
  • This study presents a method to test quite small-sized and light-weighted micro-drill bits which are used to make holes in printed circuit boards(PCB). After getting images of micro-drill bits through the high resolution microscope, we developed image processing algorithms to detect fiducial points, and then measured diverse factors of the drill-bit based on these points. We also developed the window-based inspection system to automatically discriminate normal and abnormal status. For the relative comparison of its performance, the system was compared with an existing inspection system using test images. Experimental results showed that the proposed system slightly improved performance, and also classified correctly some misjudged errors which were occurred in the existing system.

A Study on the PCB(Printed Circuit Board) Drilling by Air Bearing Spindle (공기 베어링 스핀들을 애용한 PCB 드릴링에 관한 연구)

  • Bae Myung-Il;Kim Sang-Jin;Kim Ki-Soo
    • Journal of the Korean Society for Precision Engineering
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    • v.22 no.3 s.168
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    • pp.15-20
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    • 2005
  • This paper describes the PCB drilling using an ultra high-speed air bearing spindle system and micro drill. For this research, we have developed the ultra high-speed air bearing spindle of 125,000 rpm and made an experiment for the application possibility in the PCB drilling. In order to estimate the drilling performance, we have investigated the size and damage of drilled hole, and the wear of drill at 90,000rpm. Results are as follows; we have confirmed the possibility in the PCB drilling of air bearing spindle. In case of micro-drilling PCB at $0.1mm\sim0.3mm$, the increase in the number of drilling has resulted in a bigger size of holes and also a bigger size of damage. It has been found that the wear of micro drill tends to concentrate in the main cutting edge.

Experimental Study of Machining Process of Polymer Mold for Fabrication of Three-Dimensional Hydrogel Scaffold (3 차원 하이드로젤 지지체 제작을 위한 고분자 몰드의 가공 특성에 대한 실험적 연구)

  • Lee, Pil-Ho;Lee, Sang Won;Kim, Daehoon;Kim, Si Hyeon;Sung, Jong Hwan;Chung, Haseung
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.37 no.7
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    • pp.669-674
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    • 2013
  • A three-dimensional hydrogel scaffold has been proposed for the effective production of biomimetic intestinal villi to reduce ethical and cost problems caused by animal testing in pharmaceutical development. This study explores an experimental approach to develop a new technique based on laser machining and microdrilling processes to produce a plastic mold for the fabrication of a three-dimensional hydrogel scaffold. For process optimization, both the laser machining and the microdrilling experiments are conducted by varying the experimental conditions, and structural characterization of the mold and intestinal villi were performed using SEM (scanning electron microscope) and OM (optical microscope) images. Polycarbonate (PC) was used as a candidate material. The experimental results show that intestinal villi can be fabricated by both laser and microdrilling machining processes.

Correlation Between Tensile Strength of Diaphragm and Resonance Frequency for Micro-Speaker (원형 마이크로스피커 진동판의 인장강도와 공명진동수 사이의 연관성)

  • Oh, Sei-Jin;Kim, Hae-Young
    • The Journal of the Acoustical Society of Korea
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    • v.28 no.4
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    • pp.299-307
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    • 2009
  • In this study, the acoustical properties of micro-speaker had been studied as a function of diaphragm patterns. The diaphragm was divided into two sections, such as edge and dome sides. The pattern change at each side affected the tensile strength of diaphragm. As a result, the resonance frequency was varied with the change. With increasing the number of pattern at the edge side, it was increased at the first, but it reversed to the exponential decrease of that. It increased due to the increase of tensile strength to be caused by using "U" type of drill and whirlwind pattern, and decreasing of drill angle at the edge side. However, it was decreased due to the decrease of tensile strength to be by increasing the number of radiation pattern and dome hight, and decreasing the dome radius at the dome side.

Drilled Hole Variation of Air Bearing Spindle for PCB according to RUNOUT (PCB드릴링용 공기베어링 스핀들의 런아웃(RunOut)에 따른 가공 홀의 형상변화)

  • Bae M.I.;Kim S.J.;Kim H.C.;Kim K.S.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2005.06a
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    • pp.1555-1558
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    • 2005
  • In this study, we measured cylindricity and Runout of the air bearing spindle, and tested PCB(printed circuit boards) drilling with 0.4mm micro drill at 90,000rpm and 110,000rpm in order to obtain drilling hole error. Results are as follows; The air bearing spindle's Runout was not so high within $10\mu{m}$ from 20,000rpm to 80,000rpm but it grew after 80,000rpm. Drilling hole size error was 9% at 80,000rpm and 12% at 110,000rpm because of spindle's Run out. Drilled hole shape falsified more 110,000rpm than 90,000rpm.

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Development of Micro-hole Drilling Machine and Assessment of cutting Performance (마이크로흘 드릴링 머신의 개발 및 절삭성능 평가)

  • 김민건;유병호
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.10 no.5
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    • pp.39-44
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    • 2001
  • In this paper, drill fred mechanism, cutting depth measuring device and sensing buzzer of drill contact were investigated in order to develop the micro-hole drilling machine. Also, measuring device of cutting resistance was developed in order to estimate cutting resistance from change of cutting condition. The results show that extremely-low fled rate(less then $17{\mu}m/S$${\mu}{\textrm}{m}$ /s) can be done and cutting depth can be measured by up to 1${\mu}{\textrm}{m}$ with developed drilling machine. Accordingly we could assemble a very cheap micro-hole drilling machine($\phi$ 0.05~0.5 mm). Also we got the some properties of cutting performance i.e. under the same condition, cutting torque decreases as increase of spindle speed and rapid fled of drill brings about the inferior cutting state under low spindle speed.

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Optimum Manufacturing Processes of Micro-drill (마이크로 드릴의 최적 생산설계)

  • Kim, Gunhoi
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.1 no.1
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    • pp.109-116
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    • 2002
  • Resently, reduction of industrial products in size and weight has increased by the application of micro-drill for gadgets of high precision and gave rise to a great interest in a micro-drilling. Due to the lack of tool stiffness and the chip packing, micro-drilling requires not only the robust tool structure which has not affected by the vibration, but also the effective drilling methods designed to prevent tool fracture from cutting troubles. Firstly, this paper presents a new manufacturing process of micro-drill for improving the product rate and an optimum shape of micro-drill for lengthening the tool life, and secondly suggests between tool life and drilling torque acquired in the inprocess monitoring system.

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Analysis of Fluid-Structure Interaction of Cleaning System of Micro Drill Bits (마이크로 드릴비트 세척시스템의 유체-구조 연성해석)

  • Kuk, Youn-Ho;Choi, Hyun-Jin
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.15 no.1
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    • pp.8-13
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    • 2016
  • The micro drill bit automatic regrinding in-line system is a system that refurbishes drill bits used in a PCB manufacturing process. This system is able to refurbish drill bits with a minimum size of ø0.15-0.075mm that have previously been discarded. Beyond the conventional manual cleaning process using ultrasound, this system adopts a water jet cleaning system, making it capable of cleaning drill bits with a minimum size of ø0.15-0.075mm. This paper analyses various contact pressures applied to the surface of drill bits depending on the shooting pressure of the cleaning device and fluid velocity in order to optimize the nozzle location and to detect structural instability caused by the contact pressures.

Optimum Shape Design of Cemented Carbide Micro-drill in Consideration of Productivity (생산성을 중시한 초경합금 소재 마이크로 드릴의 최적 형상설계)

  • 김건회
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.13 no.3
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    • pp.133-140
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    • 2004
  • Recently reduction of industrial products in size and weight has been increased by application of micro-drills in gadgets of high precision and a great interest of a micro-drilling has been raised. Due to the lack of tool stiffness and the chip packing, the micro-drilling requires not only the robust tool structure which has not affected by vibration but also effective drilling methods designed to prevent tool fracture from cutting troubles. This paper presents an optimum design shape of a 0.15 mm micro-drill associated with a new manufacturing process to improve the production rate and to lengthen the tool life and suggestions on the micro-drilling characteristic properties associated with the tool life and workpiece quality.

Manufacturing Process of Micro-drill

  • Gunhoi Kim;Sunggu Lee;Jaekyung Lee;Kyusik Kwon
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2001.04a
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    • pp.287-293
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    • 2001
  • Resently, reduction of industrial products in size and weight has increased by the application of micro-drill for gadgets of high precision and gave rise to a great interest in a micro-drilling. Due to the lack of tool stiffness and the chip Packing, micro-drilling requires not only the robust tool structure which has not affected by the vibration, but also the effective drilling methods designed to prevent tool fracture from cutting troubles. Firstly, this paper presents a new manufacturing process of micro-drill for improving the Product rate and an optimum shape of micro-drill for lengthening the tool life, and secondly between tool life and drilling torque acquired in the inprocess monitoring system.

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