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자기연마를 이용한 난삭재 Tungsten Carbide Bar의 마이크로 초정밀가공 특성
배중탁,김정수,문상돈,kim han joo 한국기계기술학회 2019 한국기계기술학회지 Vol.21 No.4
Magnetic abrasive finishing (MAF) process is a surface improvement method, which the magnetic field of permanent magnet or electromagnet is used to control the abrasive particles during the finishing process. The magnetic abrasive tools are filled between the N-pole and S-pole of Nd-Fe-B type permanent magnets. Tungsten carbide bar (WC) is a high hardness material and its compressive strength is much higher than the other materials. Therefore, due to its superior mechanical properties, it has been widely used in cutting or machining process. Because the smooth surface of tungsten carbide is required in cutting tools, thus the magnetic abrasive finishing process was applied for achieving its surface accuracy and dimensional accuracy. The results showed that the surface roughness of tungsten carbide bar was improved from Ra: 0.23㎛ to Ra: 0.02㎛ in 120 sec by magnetic abrasive finishing process.
박원규,최환,노태우 한국기계가공학회 2005 한국기계가공학회지 Vol.4 No.1
An internal finishing process by the application of magnetic abrasive finishing 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 experimently investigated by various effective factors such as vibrating frequency and amplitude. From the experimental results, it is found that the vibration effects of magnetic poles on the finishing characteristics are large in internal finishing
자기연마법에 의한 파인 세라믹 BAR의 가공특성에 관한 연구
문상돈 ( Sang-don Mun ),( Takeo Shinmura ),( Hitomi Yamaguchi ),( Toshio Aizawa ),조철용 ( Chul-yong Cho ) 한국환경기술학회 2006 한국환경기술학회지 Vol.7 No.3
본 논문에서는 파인 세라믹 바를 고속으로 회전시켜 자기연마법을 이용하여 고정밀가공의 가능성을 확인하였다. 또한 표면 정밀도를 향상시키기 위해 전해철분과 초정밀 가공용 다이아몬드 입자를 혼합한 지립과 자극의 진동을 이용하였다. 결과적으로 다이아몬드의 입자 크기, 양의 변화 그리고 자극의 진동과 세라믹 바의 표면거칠기가 밀접하게 관련되어 있다는 것을 알 수 있었다. In this paper, the possibility of high precision machining was confirmed by using magnetic abrasive machining 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 machining 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.
희토류(Nd-Fe-B) 영구자석을 이용한 STS304 바의 자기연마 가공 특성에 관한 연구
우채원,김정수,행리다,문상돈 한국기계기술학회 2019 한국기계기술학회지 Vol.21 No.3
In this research, the magnetic abrasive finishing process using (Nd-Fe-B) permanent magnet was applied to confirm the performance and to find the optimum conditions. The STS304 bar was used as the specimen in this experiment. In order to confirm the performance of magnetic abrasive finishing process, the surface roughness (Ra) and diameter reduction were measured when the specimens were processed under the conditions of rotational speeds, frequencies, and magnetic pole shapes. The rotational speeds were varied at 8000rpm, 15000rpm, 20000rpm, and 25000rpm. And the frequencies were changed to 0Hz, 4Hz and 10Hz. Also the shapes of the magnetic pole were changed to flat edge, sharp edge and round edge. It can be concluded that the surface roughness (Ra) and diameter reduction were found to be the best at 25000rpm, 4Hz, flat edge.
다양한 온도에서 자기연마법을 이용한 마이크로 직경의 STS304 Bar 표면 가공
박남준,강파 한국기계기술학회 2020 한국기계기술학회지 Vol.22 No.1
A magnetic abrasive finishing process was proposed for improving the surface accuracy of microscale -diameter STS 304 bar used in many applications such as, medical, aerospace, and nuclear industries. Most of the previous research has already explored the conventional finishing technique to improve the accuracy of material in terms of the surface roughness. However, their results are still not good enough for the requirement in the today’s engineering industry. Especially, when the workpiece is a material of microscale-diameter, use of such conventional processes becomes impossible because they entail the application of high pressures that may damage the surface to be finished. Moreover, less control is available over these conventional finishing processes. In this study, an ultra-high-precision magnetic abrasive finishing process was applied to the precision machining of microscale-diameter STS 304 bar and the experimental work are performed with many critical parameters such as, different workpiece revolution speeds, abrasive grain sizes, different finishing temperatures, and pole vibrations. The results showed that in The initial surface roughness of 0.20 µm (Ra) was decreased to 0.025 µm with 0.5 µm of abrasive grain size and pole vibration 12Hz at 40,000 rpm.
UXO(Unexploded Ordnance) 탐지를 위한 자력탐사 기술
박인석(In-Seok Park),김현도(Hyun-Do Kim),김진후(Jin-Hoo Kim) 한국마린엔지니어링학회 2005 한국마린엔지니어링학회 학술대회 논문집 Vol.2005 No.-
The paper presents a method for location of subsurface UXOs. The approach utilities gradient interpretation techniques (analytic signal, horizontal gradient and Euler methods) to locate the objects. Then, linear least-squares technique, we obtain the magnetization location of the sources. We demonstrate the practical utility of the method using marine magnetic field data.
MR 유체를 이용한 장치개발의 자기설계인자에 관한 연구
심재철(Jae-Cheol Shim),방흥석(Heung-Sug Bang) 산업기술교육훈련학회 2008 산업기술연구논문지 (JITR) Vol.13 No.4
In this study a new type mount featuring MR fluid is proposed and the effect of MR fluid mount reduction is investigated by the change of magnetic pole shape. MR fluid mount is made to check magnetic characteristics in the MR fluid mount core part proposed by varying magnetic pole affective length and the structure of core center. The magnetic resistance is decreased according to the increase of the effective magnetic pole length by the magnetic Ohm s law calculation. And the other magnetic characteristics is not affected by it. A small change of magnetic flux density and magnetic flux strength is verified by Ansys analysis. The design of magnetic structure can be done by the simple magnetic Ohm s law.
자기연마법에 의한 파인세라믹 Bar의 가공특성에 관한 연구
문상돈(Sang-Don Mun),Takeo Shinmura,Hitomi Yamaguchi,Toshio Aizawa,조철용(Chul-Yong Cho) 한국생산제조학회 2006 한국생산제조시스템학회 학술발표대회 논문집 Vol.2006 No.5
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.