• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2002년도 춘계학술대회 논문집
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• pp.964-967
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• 2002

An internal finishing process by the application of magnetic abrasive machining has been developed as a new technology to obtain a fine inner surface of pipe. In this paper, another method of magnetic abrasive machining in which the N and S magnetic poles are feed and a workpiece is rotated only is tried in a fine-pipe, and its finishing characteristics is experimently investigated by various effective factors such as feeding amplitude. From the experimental results, it is found that the feed effects of magnetic poles on the finishing characteristics are large in internal finishing.

• 대한기계학회논문집A
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• 제38권9호
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• pp.1013-1018
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• 2014

자기연마가공은 연마입자와 자성입자를 혼합한 공구의 유연성을 이용하여, 공작물 표면을 폴리싱하는 특수가공법이다. 기존 연구의 대부분은 가공 정밀도를 향상시키기 위해서 연마입자의 크기를 달리 하는 것에 관한 내용들이다. 그러나 자기연마 가공에서는 연마입자의 크기뿐만 아니라, 자성입자의 크기도 가공에 많은 영향을 미칠 것으로 판단되며 이에 대한 연구가 반드시 필요하다. 따라서 본 연구에서는 크기가 다른 자성입자들을 사용하여 자기연마가공의 효과를 평가하였다. 자성입자는 철분말을 사용하였으며, 직경이 평균 8, 78, $250{\mu}m$의 크기이다. 공작물의 표면거칠기 향상 정도를 비교하여 자성입자의 크기가 자기연마가공의 정밀도에 미치는 효과를 평가하였다. 자성입자의 크기는 표면거칠기의 향상에 많은 영향을 미치며, 직경이 $78{\mu}m$일 때 가장 좋은 표면거칠기의 향상을 나타내었다.

• 대한기계학회논문집A
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• 제35권12호
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• pp.1641-1646
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• 2011

자기연마공정은 유동성이 높은 연마입자를 활용하기 때문에 곡면 및 그루브 형상에도 적용이 가능한 장점을 지니고 있다. 본 연구에서는 제 2세대 자기연마법을 활용하여 그루브 형상에 대한 자기연마가공 특성을 평가하여, 이를 향후 연료전지 채널과 같은 3차원 형상의 자기연마에 활용하고자 한다. 실험은 최대 1.5mm 깊이의 그루브에 대해 자기연마가공 후 슬롯부 및 랜드부의 표면거칠기 변화를 관찰하였다. 그 결과 랜드부의 길이가 증가하고 그루브의 깊이가 깊어질수록 랜드부의 표면거칠기 향상정도는 높아졌다. 또한 슬롯부의 표면거칠기 향상정도는 랜드부와 슬롯부의 길이비가 증가하고 그루브의 깊이가 깊어질수록 감소하는 경향을 나타내었다. 마지막으로 자기연마가공을 통해서 그루브의 형상에는 큰 변화없이, 그루브의 모서리에 생성된 버를 효과적으로 제거할 수 있었다.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2003년도 춘계학술대회 논문집
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• pp.1836-1839
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• 2003

This paper describes the surface polishing characteristics of a flat and free surface ferromagnetic substance(SM45C) that magnetic abrasive polishing processed. The effects of the various working factors on the surface roughness are clarified by experiments respectively, such as magnetic flux density. rotation speed of magnetic head. working gap, feed rate of workpiece. diameter of magnetic abrasives. and shape of workpiece. On the basis of these experiments, the polishing mechanism is discussed and the characteristics of the polishing process are described. In addition, it is found experimentally that die ＆ mold surfaces are also polished precisely by this process

• 한국공작기계학회논문집
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• 제13권6호
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• pp.74-80
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• 2004

An internal finishing process by the application of magnetic abrasive machining has been developed as a new technology to obtain a fine inner surface of pipe. In this paper, the finishing process of a non-ferromagnetic pipe by a static magnetic field method is introduced and its finishing characteristics is discussed with effective factors by various experiments. From these experimental results, it is found that the magnetic abrasives inserted in the pipe are arranged according to the magnetic force line. Through the experimental, it is possible to estimate the proper supply volume of the abrasive, which in proportional to the diameter of pipe.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2000년도 춘계학술대회 논문집
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• pp.792-795
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• 2000

The magnetic assisted finishing thought to be one of the potential methods for the automatic polishing process. In this study, magnetic assisted finishing process was experimentally attempted to polish the intrnal surface of the cylindrical tube. The newly developed magnetic tool was used, and its polishing performance exmined. From the experimental results, it is found that i ) the newly developed tool is suitable for intrnal surface finishing of the tube. ii ) the surface roughness of 0.9~1${\mu}{\textrm}{m}$Rmax before polishing is improved to the value of 0.2 ${\mu}{\textrm}{m}$Rmax in the finishing experiment of stainless steel STS3602L tube in 6 minutes finishing time.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2001년도 춘계학술대회 논문집
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• pp.960-963
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• 2001

An internal finishing process by the application of magnetic abrasive machining has been developed as a new technology to obtain a fine inner surface of pipe. In this paper, another method of magnetic abrasive machining in which the N and S magnetic poles are vibrated and a workpiece is rotated only is tried in a non-ferromagnetic pipe(SUS304), and its finishing characteristics is experimental results, it is found that the vibration effects of magnetic poles on the finishing characteristics are large in internal finishing.

• 한국공작기계학회:학술대회논문집
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• 한국공작기계학회 2003년도 추계학술대회
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• pp.313-317
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• 2003

Micro-Channel ultra-precision polishing is a new technology used in magnetic field-assisted relishing. In this paper, an electromagnet or the i18 of test system was designed and manufactured. A size of magnetic abrasive is used on 25~75${\mu}{\textrm}{m}$ and for the polish a micro-channel upper part. A surface of channel which is not even is manufactured using magnetic abrasive finishing at upper surface of micro-channel. As a result, the surface roughness rose by 80％ after upper surface of micro- channel was polished up 8 minutes by polishing.

• 대한기계학회논문집A
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• 제34권11호
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• pp.1643-1648
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• 2010

비자성체의 자기연마 공정에서는 공작물 표면에 발생하는 자속밀도가 매우 낮아 자기연마입자에 작용하는 절삭력이 현저히 낮아진다. 따라서 공작물 반대편에 전자석을 설치하여 공작물 표면의 자속밀도를 효과적으로 증가 시킬 수 있다. 본 연구에서는 전자석 배열 테이블을 비자성체의 자기연마에 활용하기 위해 전자석 배열에 따른 자속밀도 및 극성변화에 대한 시뮬레이션 및 실험적 검증을 수행하였다. 그 결과 전자석이 같은 극성을 가질 때 보다 중심부분 전자석을 기준으로 주변 전자석이 반대의 극성을 가질 때 중심부분의 전자석에서 가장 높은 자속밀도를 가지는 것을 확인할 수 있었다.

• 한국공작기계학회:학술대회논문집
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• 한국공작기계학회 1995년도 추계학술대회 논문집
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• pp.24-29
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• 1995

A recently developed finishing process using rotating magnetic field is known to be very efficient for the finishing of parts such as vacuum tube, sanitary tube, etc., which are difficult to be finished by the conventional finishing methods as they are generally curbed tubes. But, the finishing system using rotating magnetic field have the defect that is the cross section of workpiece only circle because of internal rotating tool. Therefore, new finishing process of the workpieces which cross section are not circle is important and required. magnetic abrasive jet machining is a new concept finishing process. It is the precision internal finishing method using working fluid mixed with magnetic abrasives, which is jetted into the internal surface of tube. And magnetic poles are equipped on external surface of tube. In this study new concept finishing process or, magnetic abrasive jet machining system was developed. machining condition was predicted using simulation and some characteristics of the finishing process was analyzed.