• 제목/요약/키워드: abrasive grain size

검색결과 21건 처리시간 0.023초

마이크로 연마 필름을 이용한 경면 가공 시스템에 관한 연구 (A Study on the Mirror Surface Finishing System Using Micro Abrasive Film)

  • 김홍배;김기수;남궁석
    • 한국정밀공학회지
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    • 제14권10호
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    • pp.68-74
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    • 1997
  • The surface finishing system using the micro abrasive film was designed and manufactured to make the mirror surface of the cylindrical workpices. An experimental study of srface finishing was carried out to investigate the performance of mirror surface finishing system. The surface roughness value of stainless steel was about 0.2 .approx. 0.25 .mu. m Rmax, 0.02 .approx. 0.04 .mu. m Ra, using abrasive grain size of 12, 9 .mu. m. The surface roughness value of chrome coated workpiece was about 0.07 .approx. 0.11 .mu. m Ra using abrasive grain size 3 .mu. m. In the same condition, the chrome coated workpiece has obtained better surface roughness charateristics than the one of stainless steel.

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Powder의 특성에 따른 Magnetic Abrasive Deburring 특성분석 (Magnetic Abrasive Deburring Character Analysis According to the powders)

  • 채종원;고성림
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2003년도 춘계학술대회 논문집
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    • pp.1877-1880
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    • 2003
  • We were interest in Deburring using MAF(magnetic abrasive finishing) method. So Magnetic inductor was designed and manufactured to generate proper magnetic induction fer deburring the burr formed in drilling SM45C. We experienced according to the Rotational speed, table feed rate, grain size of powder and working gap are changed to investigate the effect on deburring. At this time we experienced in abrasive effect mainly.

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다이아몬드 연마재 입도가 초경 습식신선 다이스 수명에 미치는 영향 (The Influence of Diamond Abrasive Size on the Life of Tungsten Carbide Wet Drawing Dies)

  • 이상곤;김민안;고대철;김병민
    • 소성∙가공
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    • 제15권7호
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    • pp.518-523
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    • 2006
  • Wet wire drawing of brass coated steel wire, used for tire reinforcement, is realized with Tungsten Carbide(WC) dies sintered with a cobalt(Co) binder. Dies wear represents an important limitation to the production process and cost savings. Several parameters, such as Co content, WC grain size of tungsten carbide, sintering conditions, and so on, affect on the wear of the drawing die. In this study, the effect of the diamond abrasive particle size on the life of the WC centered dies of the wet wire drawing was investigated. Wet wire drawing experiments were carried out on a wet wire drawing machine. From the experiments, the dies life, dies fracture, wire surface roughness, and wire breaks were investigated. From the results, it was found that the wear of the WC dies increased with the increase in the diamond abrasive particle size.

마이크로 필름을 이용한 경면가공 시스템에 관한 연구 (A Stlidy on the Mirror Surface F~n~shinSgy stem using Micro Abraslve Film)

  • 김기수;남궁석
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 1994년도 추계학술대회 논문집
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    • pp.273-278
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    • 1994
  • The surface finishing systems using the micro abrasive film were designed and manufactured to make the mirror surface of the cylindrical workpiece. An experimental study of surface finishing was carried out to investigate the performance of mirror surface finishing system. The surface roughness of stainless steel was about Rmax 0.2~0.25 .mu.m, Ra 0.02~0.04 .mu.m in abrasive grain size 12, 9 .mu.m. the surface roughness of chrome coated workpiece was about Rmax 0.07~ 0.11 .mu. m, Ra 0.01 in abrasive grain size 3 .mu. m. Also, to measure the mirror finishing time by mirror surface finishing system, the experiment was carried out on the chrome coated and ground roller of diameter 76mm and length 650mm. The finishing time and surface roughness were 40min and Rmax 0.1~0.13 .mu.m, Ra 0.01 .mu.m.

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실험 계획법을 이용한 초정밀 경면 연마 가공에서 표면 거칠기에 영향을 미치는 인자의 검출 (Extraction of Factors Effecting Surface Roughness Using the System of Experiments in the Ultra-precision Mirror Surface Finishing)

  • 배명일;김홍배;김기수;남궁석
    • 한국정밀공학회지
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    • 제15권2호
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    • pp.53-60
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    • 1998
  • In this study, it is experimented to find factors effecting surface roughness using the system of experiments. in the mirror surface finishing system. (1) The film feed and oscillation frequency in $40{\mu}m$ abrasive film, grinding speed in $30{\mu}m$, and machining time in $15{\mu}m$15 are the main factors effecting the surface roughness. (2) Applying the optimal finishing condition to $40{\mu}m$, $30{\mu}m$, $15{\mu}m$ abrasive finishing film in sequence, it is possible to obtian about Ra 10 nm surface roughness on SM45C workpiece. (3) Application of the system of experments to the micro abrasive grain film finishing was very effective method in the extraction of main factor and optimal condition.

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입자유동시스템에 의한 스프링콜릿 버의 디버링 효과 (Effect on the Deburring of Spring Collet Burr by Abrasive Flow System)

  • 김정두
    • 한국공작기계학회:학술대회논문집
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    • 한국공작기계학회 1998년도 추계학술대회 논문집
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    • pp.192-197
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    • 1998
  • Abrasive flow machining is useful to abrasive polish a internal or external surface of the free shape dimensional parts, which are used in many fields such as machine tool parts, semi-conductor, and medical component industries. The machining process is that two hydraulic cylinders, which are located surface to surface, are enforce media to the passage between workpiece and tooling part alternately, and then the abrasives included in the media pass the passage and polish the surface of workpiece. The media which is made of polymer and abrasive plays complex have workpiece by its viscoelastic characteristics. In this study, the media for AMF was made by mixing viscoelastic polymer with alumina and silicon carbide abrasive respectively. As a result, alumina include media is also the experiments of deburring the inside burr of in order to analyse the deburring machinability of abrasive flow machining according to various machining parameters which were media flow rate extrusion pressure, passage gap, media viscosity, abrasive content, and abrasive grain size.

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자기연마를 이용한 디버링 특성 분석 (Analysis of Deburring Characteristics by Magnetic Abrasive Finishing Method)

  • 채종원;고성림
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2002년도 추계학술대회 논문집
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    • pp.241-244
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    • 2002
  • Deburring is conducted using MAF(magnetic abrasive finishing) method. Magnetic inductor is designed and manufactured to generate proper magnetic induction far deburring the burr formed in drilling SM45C. Rotational speed, table feed rate, grain size of powder and working gap are changed to investigate the effect on deburring.

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액체호닝에 의한 금형 자동 사상기계개발 및 가공 특성 (Polishing Characteristics and Development of Automatic Die Polishing Machine by Liquid Honing)

  • 김재도;류기덕;홍정석
    • 한국정밀공학회지
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    • 제17권6호
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    • pp.162-168
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    • 2000
  • The automatic die polishing machine by liquid honing has been developed and experimented on the surface of machined die. The goal of development in the automatic die polishing machine by liquid honing is to increase the accuracy and the productivity in die polishing. To reach this goal, the polishing machine consists of the automatic measuring device for contour of die, the nozzle and pumping system to spray the powder mixed with liquid, and the 3-axis guides. Before polishing, the measuring device with a semiconductor laser scans the surface of mould to get the data of contour. The data store a PC and use to control the nozzle head to move above a couple of centimeters on the machined surface of die. The experimental parameters are the spraying time, the pressure, the size of abrasive grain and the mixing ratio between abrasive grain and liquid. The surface roughness is measured on the polished die which are SKDl 1 and Al7075 machined by NC. The surface roughness indicates the values of Rmax 0.5${\mu}{\textrm}{m}$ for Al7075 and Rmax 1.4${\mu}{\textrm}{m}$ for SKDl 1. It reduces the polishing time significantly and reduces the monotonous work for labors. As the results, the liquid honing system is useful method to apply for the die polishing and the automatic die polishing machine using liquid honing shows that it's very effective processing ability.

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STS 304 파이프 내면의 자기연마법에 있어서 WA-BF-Fe 자성입자가 표면거칠기에 미치는 영향 (Study on Surface Roughness due to WA-BF-Fe Grain for Internal Magnet-abrasive Finishing Apparatus of STS 304 Pipe)

  • 김용수;정윤중;김희남;김순채;배재만
    • 한국안전학회지
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    • 제16권3호
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    • pp.35-40
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    • 2001
  • An internal finishing process applying Magnetic Abrasive Finishing (MAF) was proposed to produce smooth inner surfaces of tubes at a high rate. Since this process uses the tube rotation system, it has been considered applicable only to tubes which are rotatable at high speeds. Here development of the stainless tube(STS 304) rotation system to extend the scope of the application of the internal finishing process applying MAF was made. By the stainless tube(STS 304) rotation system, the abrasive magnetically attracted by the poles is rotated along the inner surface of the tube by magnetic force together with fixed poles, finishing the inner surface of the tube. The main results obtained are as follows : 1) The magnet abrasive finishing minimized influence due to external force because non-contact finishing, 2) The profile of surface roughness decreased very good in 11.4m/min range because abrasive size and speed, 3) The profile of surface roughness by flux density decreased in finishing speed 28m/min, 4) The profile of surface roughness by fled rate decreased in 0.16mm/rev and 0.18mm/rev.

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크롬 도금 강의 초정밀 연마 가공특성 (Ultra-precision finishing characteristics of Coated Chrome steel)

  • 배명일
    • 한국생산제조학회지
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    • 제7권6호
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    • pp.97-101
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    • 1998
  • In this study, The ultra-precision finishing system is applicable to all kind of the cylnderical workpiece products fast and easy. This system was applied to chrome coated steel to investigate the characteristic of grinding; (1) 3$mu extrm{m}$ of abrasive film is not use for grinding performance. (2) Grinding condition of coated chrome steel would set up differently, in 30~12${\mu}{\textrm}{m}$, in 9~5${\mu}{\textrm}{m}$. (3) The surface roughness of chrome coated steel was about Ra 0.0009${\mu}{\textrm}{m}$ in abrasive grain size 5${\mu}{\textrm}{m}$.

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