• Title/Summary/Keyword: fine grinding

검색결과 149건 처리시간 0.024초

가공유제의 환경피해와 대책 (A Counterplan and Environmental damage of Cutting fluids)

  • 김남경;김해지;정종달
    • 한국공작기계학회:학술대회논문집
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    • 한국공작기계학회 2002년도 춘계학술대회 논문집
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    • pp.223-238
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    • 2002
  • This paper presented on an environment estimation of cutting fluid which is a mouse model of acute bacterial rhinosinusitis using cutting fluid in grinding and cutting. Above results will be remarked the necessity of friendly environmental cutting skill when it had used in workshop. The results of a mouse experimental using cutting fluid showed that it are occurred to the respiratory organs sickness. Also cutting fluid are occurred to hurtfulness a person when it used to grinding and cutting in workshop. Also, the results of grinding experiments in avitation materials showed that surface roughness are superior to more emulsion type oil than vegetable type oil according to increase of the depth of cut. Grinding force are similar to both emulsion type oil and vegetable type oil.

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환경 친화적 기계가공 기술에 관한 연구 연삭공정에서의 절삭유 미립화와 환경영향(I) (A Study on the Environmentally Conscious Machining Technology Cutting Fluid Atomization and Environmental Impact in Grinding Operation (I))

  • 황준;정의식
    • 한국정밀공학회지
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    • 제22권6호
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    • pp.61-69
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    • 2005
  • This paper presents the experimental results to analyze the atomization characteristics and environmental impact of cutting fluid in grinding process. Grinding is a major machining process to improve surface quality with different machining mechanism which is compared with turning or milling process. The environmental impact due to aerosol generation via grinding process is a major concern associated with environmental consciousness. Experimental results show that the generated fine aerosol which particle size less than 10 micron appears near working zone under given operational conditions. The aerosol concentration is much higher enough to affect human health risk with its generated aerosol quantities. This study can be provided a basic knowledge fur further research of environmental consciousness machining development.

자성연마슬러리를 이용한 초미립 초경합금(WC-Co 18%)의 나노급 경면가공 특성 (Machining Properties to Nano-Level Mirror Surface Finishing for Fine Grained WC-Co 18% Alloy using Magnetic Polishing Slurry)

  • 곽태수
    • 한국세라믹학회지
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    • 제46권1호
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    • pp.102-107
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    • 2009
  • This study has been focused on an effective surface finishing method combining ELID (ELectrolytic In-process Dressing) and MAP (Magnetic Assisted Polishing) for the nano-precision mirror grinding of glass-lens molding mould. ELID grinding is an excellent technique for mirror grinding of various advanced metallic or nonmetallic materials. A polishing process is also required for elimination of scratches present on ELID grinded surfaces. MAP has been used as polishing method due to its high polishing efficiency and superior surface quality. It also presents some techniques for achieving the nanometer roughness of the hard material such as WC-Co, which are extensively used in precision tooling material.

Ball Mill 분쇄에 의한 고령토의 미분성분 생성과정의 해석(II) (Analysis of Production Process of Fine Size Fraction of Korean Kaolin by Ball Mill Grinding II)

  • 서태수;심철호;김상필
    • 한국세라믹학회지
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    • 제24권1호
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    • pp.1-8
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    • 1987
  • The validity of Alyavdin-Chujyo's Equation was re-examined over the broader milling conditions that those previously examined. Ordinary ball mill grinding with a laboratory scale batch mill (133mmø×144mm length) were selected as the grinding methods. The results show that in ball milling the Alyavdin-Chunjyo's Equation can be applicable over wide grinding time and size range with few exceptions. The validity of which are examined and discussed. The theoretical consideration of the relation between Alyavdin-Chujyo's Equation and size distributiion equation, such as Rosin-Rammler's law, was tried, and it is found that, under the condition of alyardin-Chujyo's relation, the Rosin-Rammler size distribution law can hold.

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화순산 경질점토의 정제에 관한 연구 (Study on Refinement of Hwasun Flint Clay)

  • 박금철;장영재
    • 한국세라믹학회지
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    • 제27권6호
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    • pp.769-776
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    • 1990
  • This study deals with the refinement of Hwasun flint clay by grinding, classifying, magnetic separation and acid treatment in sequence. Results are as follows ; 1. Fine kaolinite particles of median size in the range of 4.8 and 1.7$\mu\textrm{m}$ was collected, with the yield of 87.4% by dry grinding and classifying process. 2. It is proven that the iron bearing are of Hwasun flint clay is mainly consisted of chloritoid and iron rich muscovite. 3. As the results of the high gradient magnetic separation, the bleaching and iron removal degree of the dry grinding and classifying sample was 4-58% and 5-62% respectively. 4. As the results of the acid treatment, bleaching and weight loss degree of the dry grinding and classifying sample was reduced to 16-82% and 6-29% respectively.

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모터 전류 변화를 이용한 실리콘 웨이퍼 연삭 공정 모니터링 시스템 (Monitering System of Silicon Wafer Grinding Process Using for the Change of Motor Current)

  • 박선준;김성렬;이상직;박범영;정해도
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2005년도 춘계학술대회 논문집
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    • pp.104-107
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    • 2005
  • Recently, according to the development of semiconductor industry, needed to high-integration and high-functionality. These changes are required for silicon wafer of large scale diameter and precision of TTV (Total Thickness variation). So, in this research, suggest that the method of monitoring system is using motor current. This method is needed for observation of silicon wafer grinding process. Motor current sensor is consisted of hall sensor. Hall sensor is known to catching of change of current. Received original signal is converted to the diginal, then, it is calculated RMS values, and then, it is analysed in computer. Generally, the change of force is relative to the change of current, So this reason, in this research tried to monitoring of motor current change, and then, it will be applied to analysis for silicon wafer grinding process. using motor current sensor.

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미세홈 가공시 고압공기분사에 의한 형상정밀도의 향상 (The Improvement of Form Accuracy by High Pressure Air Jet in Slot Grinding)

  • 이석우;이용찬;정해도;최헌종
    • 한국정밀공학회지
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    • 제16권1호통권94호
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    • pp.68-74
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    • 1999
  • One of the recent changes in machining technology is rapid application of micro- and high precision grinding processes. A fine groove generation is necessary for the fabrication of optic, electronic and semiconductor parts, and achieved by chemical or mechanical processes. Slot grinding is very efficient for the generation of micro ordered groove with hard and brittle materials. As slot grinding is continuous, the ground depth become gradually shallow because of wheel wear. The form accuracy become worse from the increase of ground slot width by the loading phenomena at wheel side, results on chipping damage of the workpiece. The experiments achieve to the enhancement of the form accuracy and chipping free of the brittle materials using V shaped cast iron bonded diamond wheels. In this study we focused on the investigation of the effect of the high pressure air jet on the grinding characteristics. As a results, we found that the high pressure air jet is very effective on the reductions of the wheel wear, enhancement of the form accuracy.

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CFD분석을 통한 기류식 분쇄기 날개부의 최적설계 (Optimum Design for an Air Current Pulverizing Blade Using the Computational Fluid Dynamics)

  • 김건회;김한빛
    • 한국기계가공학회지
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    • 제19권8호
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    • pp.8-14
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    • 2020
  • In the air current pulverizing type grinding method, the blade wings fitted inside a casing are rotated at a high speed to generate a cornering air current, which facilitates the collision of materials with one another, leading to the pulverizing phenomenon. In contrast to mechanical grinding, grit pulverizing leads to fine grinding and less acid waste and degeneration of the material. Moreover, this approach prevents the loss of nutritional value, while allowing the milling grain to have an excellent texture. However, the existing air current pulverizing type machines consist of prefabricated blades, which cannot be rotated at a speed higher than 5,000 rpm. Consequently, the grinding process becomes time consuming with a low productivity. To overcome these problems, in this study, the shape and structure of the air current pulverizing type wings were optimized to allow rapid grinding at more than 8,000 rpm. Moreover, the optimal design for the ripening parts for the air current pulverizing type device was determined by performing a computational fluid dynamics analysis based on airflow analyses to produce machinery that can grinding materials to the order of micrometers.