• Journal of the Korean Society for Precision Engineering
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• v.13 no.3
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• pp.9-25
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• 1996

수치제어(Numerical control)의 개념은 1800년대부터 시작되었다. 프랑스의 Joseph Jacquard는 1801년에 구멍을 낸 카드(Perforated cards)를 이용하여 베틀기계에 직물의 모양을 Design하는데 자동적으로 Control 하는 방법을 창조해냈다. 그 후 구멍을 낸 카드를 이용하여 페달을 밟아 얻어진 공기를 Air motor와 Valve 를 조정하므로서 자동적으로 Piano를 연주하게 하는 방법도 역시 수치제어다. 이 NC의 개념이 실제 공작기계 에 적용된 것은 제2차 대전후의 일이다. 미공군(US Air force)에서는 복잡한 형상의 항공기부품가공과 그것을 검사할 검사용 Gauge를 고정밀도로 효율있게 제작할 필요성이 절실해졌다. 미국 Michigan주 Traverse시에 있던 Parsons회사도 Helicopter의 Rotor blade의 윤곽을 정확하게 검사하는 Plate gauge를 가공할 수 있는 기계를 개발하고 있었으며 그 회사의 사장 John T. Parsons씨는 Jig boringmachine을 전자적으로 제어하는 Plate gauge를 가공하는 방법을 미공군에 제안을 하였다. 1948년 미공군에서는 설계번경이 수없이 일어나는 Missile 의 부품을 단시간 내로 제작하기 위해서 Persons사와 기술계약을 맺고 새로운 공작기계 개발에 착수하므로서 NC공작기계 연구를 시작한 역사적인 시발점이 되었다.

• Journal of the Korean Society of Manufacturing Process Engineers
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• v.20 no.10
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• pp.50-55
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• 2021

In this study, to create circular holes on an inclined conic face, we developed a novel process of vertical piercing on the plane before drawing, instead of applying an expensive cam-piercing method. The pierced holes are deformed during the drawing, and their shapes are affected by the size of the center hole. Using the Abaqus CAE program, the deformation tendency of the holes, according to the diameter of the center hole, was identified, and the diameter for securing the roundness of the side holes were determined through actual experiments. The developed process was successfully applied to mass production of the part, and a cost reduction is expected.

• Journal of the Korean Society for Precision Engineering
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• v.17 no.7
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• pp.20-27
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• 2000

한국은행의 지식기반산업의 국민 경제적 역할 분석에 따르면, 91년부터 99년까지 지식기반산업의 연평균 성장률은 13.7%로 다른 산업의 4.1%보다 3배 이상 높은 것으로 조사되었다. 그중 항공기, 사무계산 및 회계용 기기, 의약품, 영상 음향 통신장비 등 첨단제조업은 이 기간 중 연평균 20.1% 성장을 기록하였다. 이와 같은 첨단제조업에서는 제품 내 부품의 정밀가공 기술이 필수적이다. 그 중에서도 미세 가공에 대한 관심은 지속적으로 증가하고 있는 추세이다.(중략)

• Journal of the Korean Society of Manufacturing Technology Engineers
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• v.8 no.2
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• pp.7-16
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• 1999

• Journal of the KSME
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• v.50 no.6
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• pp.36-42
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• 2010

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2013.05a
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• pp.529-530
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• 2013

• Laser Solutions
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• v.18 no.3
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• pp.9-13
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• 2015

The development of a reliable, high-power source of mind-IR laser light gives process develop important tool with unique characteristics that will significantly impact a diverse range of applications.

• Journal of the Korean Society for Precision Engineering
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• v.17 no.10
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• pp.132-140
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• 2000

In conventional drilling, burr geometry can be changed according to the variation of drill geometry like point angle, rake angle. Step drilling is proposed to minimize the burr formation in drilling operation. The burr formed in first cutting can be removed in second cutting by the edge in step. The burr formed in second cutting by the edge in step can be minimized according to the change of geometry like, step angle and depth. The mechanism in step drilling is analyzed. Some step drills are applied to drilling the input shaft which is used for vehicle steering. To measure the burr formed in drilling, laser and height gage are used.

• Journal of the Korean Society for Precision Engineering
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• v.15 no.12
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• pp.55-61
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• 1998

Recently, the needs of machining technologies of very small parts have been increasing with advent of micro-revolution. These technologies have mostly used the method applied to semi-conductor production process such as LIGA, etc. But they have serious difficulties to settle down in terms of workpiece materials, machining thickness, 3-dimensional structure. Therefore. mciro-machining technology using EDM(Electrical Discharge Machining) was proposed. It is very difficult to machine the micro-parts (microshaft, microhole) using conventional machining. Micro-machining using BDM can machine the micro-parts easily because it requires little machining force. This MEDM(Micro-EDM) need the capabilities to move a electrode and control a discharge energy precisely, and the gap control strategy to maintain the optimal discharge condition is necessary. Therefore, in this study, the new EDM machine with high precision motion stage and high-performance EDM device was developed. Using this MEDM machine, we have machined microshaft and microhole with various shapes and sizes.

• Proceedings of the Korean Society of Machine Tool Engineers Conference
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• 2001.04a
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• pp.275-280
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• 2001

Recently, the trends of industrial products grow more miniaturization, variety and mass production. Micro drilling which take high precision in cutting work is requested more micro hole and high speed working. Especially, Micro deep hole drilling is becoming more important in a wide spectrum of precision production industries, ranging from the production of automotive fuel injection nozzle, watch and camera parts, medical needles, and thick multi-layered Printed Circuit Boards(PCB) that are demanded for very high density electric circuitry. This paper shows the tool monitoring results of micro drill with tool dynamometer. And additionally, microscope with built-in monitor inspection show the relationship between burr in workpiece and chip form of micro drill machining.