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문상돈,지창헌 원광대학교 공업기술개발연구소 1999 工業技術開發硏究誌 Vol.19 No.-
Quickness and precision are the two most important requirements for an industrial scale used in production lines. In this paper, a new approach, " Dynamic Mass-estimation Algorithm of Displacement and Velocity(DMA-DV) sensing type, is presented to improve some of drawbacks in conventional scales, The system, consisted of acceleration and displacement sensors, spring scale and microcomputer, is based on full utilization of dynamic mass measurement of acceleration and displacement via microcomputer-assisted real time monitoring. The resulting system, when combined with appropriate dynamic mass estimation algorithm software, has shown its effectiveness in terms of two desireable characteristics required.
Micro Machining of High-Hardness Materials Using Magnetic Abrasive Grains
문상돈 한국정밀공학회 2010 International Journal of Precision Engineering and Vol.11 No.5
If processing speed is increased and processing time is lengthened, a magnetic abrasive system can be used as a tool both for finishing and precise dimensional control of manufactured products at the micro-level, and for mirror face processing. Tn this study, a micro machining system that can change its high rotational speed was developed. Using micro machining with a high speed magnetic abrasive system, the diameter of difficult-to-cut materials with high hardness could be controlled almost linearly by changing the rotational speed, the frequency of magnetic poles, and the size of diamond particles. By changing machining conditions, the surface roughness of the mirror face level could be obtained. To improve roundness, a higher rotational speed improved processing time and dimensional precision, and 20,000 rpm was the optimum speed in this experiment. Roundness was obtained up to 0.15um Before and after the processing, there was almost no change in the WC(tungsten carbide) and Ni components of the material, and there were no remains of mixed-type particles such as iron and diamond on the material.
문상돈,김연직,임익태,박찬우 한국공작기계학회 2008 한국공작기계학회 춘계학술대회논문집 Vol.2008 No.-
As a technology to machine the 3-dimensional shapes of general metal material more flexibly, machining technologies such as metal cutting, grinding, etc have been steadily improved in their accuracy as well. However, the working method using machining technologies are restricted in terms of surface roughness, metal working accuracy and working hours, if a workpiece has an irregular 3-dimensional shape. Magnetic abrasive finishing process is also one of the super-precision machining technologies which proceed with the finishing metal working of precision working piece using the action of magnetic field and the mixed type magnetic abrasive. However, such studies only focus on the improvement of machining accuracy but are still incomplete in investigating the roundness. This study aims to realize the high accuracy finishing machining focusing on the roundness after magnetic abrasive finishing process of circular workpiece and the surface roughness of precision machining surface.
자기연마법에 의한 파인세라믹 Bar의 가공특성에 관한 연구
문상돈,Takeo Shinmura,Hitomi Yamaguchi,Toshio Aizawa,조철용 한국공작기계학회 2006 한국공작기계학회 추계학술대회논문집 Vol.2006 No.-
In this paper, the possibility of high precision machining was confirmed by using magnetic abrasive finishing process with rotating fine ceramic bar in high speed. Also, in order to improve the surface roughness, it was used the vibration of the magnetic pole and the mixed grain which is mixed with diamond paste for ultra precision processing and electrolytic iron powder. As a result, we knew that there is closely connected with diamond grain size, change of quantity and vibration of the magnetic pole to surface roughness of ceramic bar.
공구상태 검출을 위한 AE 및 절삭력 신호의 특성에 관한 연구
문상돈,신형곤,김태영 전북대학교 공업기술연구소 1998 工學硏究 Vol.29 No.-
During alternative cutting, tool failure is suddenly occurred, so the continuous detection of tool condition is very necessary. this research was studied about tool wear and tool fracture by AE and cutting force signal during milling. It will be proved that the possibility of in-p개cess sensing technique by AE and cutting force signal in detection of tool condition. As a result, we intended to set the standard which can detect the tool wear and the tool fracture in optional p개cessing.
SUS 304 배관재의 드릴가공시 AE신호를 이용한 공구마모 검출에 관한 연구
문상돈 전북대학교 공업기술연구소 2001 工學硏究 Vol.32 No.-
CNC 밀링머시인을 이용하여 STS 304파이프를 드릴가공하였을 때 마모검출을 통해 다음과 같은 결론을 얻었다. 드릴공구의 마모경향을 AE RMS, 비절삭저항, 토오크, 스러스트를 통해 검출할 수 있었다. 그리고 AE RMS 와 비절삭 저항은 변화의 경향이 비슷하여 이 두 신호의 경향을 이용하여 절삭 마지막 부분의 공구 상태를 신뢰성 있게 검출할 수 있었다. STS 304 파이프와 탄소 강관의 가공시 AE RMS 신호는 공구의 마모시에 증가의 기울기가 작았으나 절삭 마지막 구간에서는 증가 기울기가 다를 뿐 모두 급격히 증가하는 양상을 보였다.
금형용 고경도재의 고속정면밀링 가공시 CBN 공구의 성능에 관한 연구
문상돈,오성훈,김성일,김태영 전북대학교 공업기술연구소 1997 工學硏究 Vol.28 No.-
This paper presents the performance of CBN tools in the machining of hardened die-materials, STD11 and STD61 steel with H_RC 50, by high-speed face milling. Generally, grinding of EDM is used to machine hardened materials but so costly. If those can be replaced by cutting, it will be a greatly economical advantage. CBN tool has been recognized the effectiveness in turning, not yet in milling. So wear and surface roughness mode of CBN tool for hardened STD11 and STD61 steel will be investigated by high-speed face milling in this study.
금형강의 경도변화가 가공면의 표면거칠기에 미치는 영향에 관한 연구
문상돈 전북대학교 공업기술연구소 2000 工學硏究 Vol.31 No.-
In cutting of hardened steel such as press punch and die, the surface roughness of the machined workpiece and tool life are very important. In this paper, CBN tools were used to certify the machinability upon heat treated STD11 steel. The behaviors of the tool wear and surface roughness were examined with the change of cutting conditions. Consequently, CBN tool in machining hardened material had a long tool life, so surface roughness was maintained good condition for a long time. Surface roughness was getting better considerably by the increase of hardness of STD11 steel. Tool wear of lower hardness workpiece was severe than that of high hardness and surface roughness became rougher for lower hardness.
쓰레쉬홀드 및 주파수 변화를 이용한 공기압 제어시스템의 위치제어에 관한 연구
문상돈 전북대학교 공업기술연구소 1998 工學硏究 Vol.30 No.-
This paper deals with different method rather than PWM in position control system of pneumatic cylinder. And the following conclusion with pneumatic position control system using an on-off value were obtained from the experimental data. When position of cylinder by pressure was controlled, needed length by the threshold and the changed frequency of the input signal were controlled. And a character equation of this control system was calculated. Moreover, different method with position control of the existing PWM system was presented.