• 제목/요약/키워드: Planetary mill

검색결과 113건 처리시간 0.025초

세 가지 매체형 분쇄기를 이용한 분쇄공정에서 다양한 실험 조건에 대한 입자형상변화 (Particle Morphology via Change of Ground Particle for Various Experimental Conditions During a Grinding Process by Three Kinds of Media Mills)

  • 사꾸라기시오리;보르암갈란;이재현;최희규
    • 한국입자에어로졸학회지
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    • 제11권1호
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    • pp.9-19
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    • 2015
  • This study investigated the effects of ball mill operation condition on the morphology of raw powders in the dry-type milling process using three types of ball mills traditional ball mill, stirred ball mill and planetary ball mill. Furthermore, since spherical powders offer the best combination of high hardness and high density, the optimum milling condition to produce sphere-shaped powders was studied. The applied rotation speed ranged from 200rpm (low rotation speed) to 700rpm (high rotation speed). The used ball size ranged from 1mm to 5mm. The metal powder morphology was studied using SEM, XRD and PSA. The aimed spherical powders could be obtained under the optimum experimental conditions: traditional ball mill(200rpm, 1mm ball), planetary ball mill (500rpm, 1mm ball) and also planetary ball mill (700rpm, 1 and 3 mm ball). The results show to the development of new material using spherical type copper powder/CNT composites for air-craft and automotive applications.

A comparative study of grinding mill type on aluminium powders with carbon nano tube: traditional ball mill and planetary ball mill

  • 최희규;최경필;배대형;이승백;이웅;김성수
    • 한국재료학회:학술대회논문집
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    • 한국재료학회 2009년도 추계학술발표대회
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    • pp.27.2-27.2
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    • 2009
  • Grinding characteristics for aluminium and carbon nanotubes (CNTs) powder during traditional and planetary ball milling investigated from the viewpoint of particle behaviour with the aimat developing CNT-dispersed samples ground based on powder metallurgy routes.In this work, a comparison between the pure aluminium and CNT input aluminium grinding was carried out to determine grinding time effect on size reduction.We observed that the use of the curly small-diameter multi-walled carbon nanotubes (MWCNTs) attributed to the beneficial role of the MWCNTs as grinding aids. It is suggested that careful choices of the sizes of CNTs and Al powders would allow fine-grinding of composite particles with uniformly distributed CNT reinforcements thereby ensuring improved properties of the final composites produced by low-temperature compacting.

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유성볼밀공정으로 제조된 Fe-TiC 복합재료 분말 (Fe-TiC Composite Powders Fabricated by Planetary Ball Mill Processing)

  • 이병훈;안기봉;배상원;배선우;;김병기;김지순
    • 한국분말재료학회지
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    • 제22권3호
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    • pp.208-215
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    • 2015
  • Fe-TiC composite powders were fabricated by planetary ball mill processing. Two kinds of powder mixtures were prepared from the starting materials of (a) (Fe, TiC) powders and (b) (Fe, $TiH_2$, Carbon) powders, respectively. Milling speed (300, 500 and 700 rpm) and time (1, 2, and 3 h) were varied. For (Fe, $TiH_2$, Carbon) powders, an in situ reaction synthesis of TiC after the planetary ball mill processing was added to obtain a homogeneous distribution of ultrafine TiC particulates in Fe matrix. Powder characteristics such as particle size, size distribution, shape, and mixing homogeneity were investigated.

유성압연기를 사용한 동관 압연공정의 유한요소해석 (FEA of Copper Tube Rolling Process Using the Planetary Rolling Mill)

  • 이정길;한기범;김관우;최종웅;김재훈;조해용
    • Journal of Advanced Marine Engineering and Technology
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    • 제34권2호
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    • pp.303-309
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    • 2010
  • 유한요소법을 통하여 유성압연기(planetary rolling mill)에 의한 동관 압연공정을 연구하였다. 이 압연은 3개의 롤에 의해 만네스만 공법으로 동관을 성형하는 공정이고, 냉간가공으로 시작하여 열간가공으로 종료되며, 기존의 압출방식에 비해 공정의 단축과 원가 절감의 장점을 갖고 있다. 압연공정은 다양하고 복합적인 공정변수 들을 포함하고 있고, 각각의 변수들은 성형결과에 영향을 미친다. 그러므로 동관압연의 모든 공정변수가 고려되어져야 한다. 동관 압연공정은 성공적으로 시뮬레이션 되었고 최적의 압연조건을 결정하는데 유용할 것이다.

La2O3의 메카노케미컬 합성에 의한 LaNiO3결정상 생성 (Mechanochemical Synthesis of LaNiO3 Crystalline Phase from Mixture of La2O3sub> and NiO)

  • 김대영;김강언;이명교;정수태
    • 한국전기전자재료학회논문지
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    • 제16권8호
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    • pp.681-687
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    • 2003
  • The syntheses of LaNiO$_3$Perovskite crystalline phase from mixtures of La$_2$O$_3$and NiO via it mechanochemical(used planetary mill) and a wet ball mill process were investigated. A single and stable LaNiO$_3$perovskite crystalline phase was successfully prepared by using a heat free mechanochemical process which produced a fine amorphous powder, while that phase was not formed in a wet ball mill process which needed heat treatment ranging from 500 to 150$0^{\circ}C$ and produced a coarse powder. It was shown that the LaNiO$_3$ceramics made of the mechanochemically synthesized powder possesed a good metallic characteristic.

다양한 매체형 분쇄기를 이용한 건식 분쇄공정에서 장비의 표준화를 위한 분쇄실험의 비교 연구 (Comparative Study for the Standardization of Grinding Equipment During Dry Grinding Process by Various Grinding Mills)

  • 보르암갈란;사꾸라기시오리;이재현;최희규
    • 한국재료학회지
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    • 제25권6호
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    • pp.305-316
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    • 2015
  • The study of grinding behavior characteristics on the metal powders has recently gained scientific interest due to their useful applications to enhance advanced nano materials and components. This could significantly improve the property of new mechatronics integrated materials and components. So, a new evaluation method for standardizing grinding equipment and a comparative study for the grinding experiment during the grinding process with various grinding mills were investigated. The series of grinding experiments were carried out by a traditional ball mill, stirred ball mill, and planetary ball mill with various experimental conditions. The relationship between the standardization of equipment and experimental results showed very significant conclusions. Furthermore, the comparative study on the grinding experiment, which investigated changes in particle size, particle morphology, and crystal structure of materials with changes in experimental conditions for grinding equipment, found that the value of particle size distribution is related to the various experimental conditions as a revolution speed of grinding mill and media size.

A Study on Physical Properties of Mortar Mixed with Fly-ash as Functions of Mill Types and Milling Times

  • Seo, Sung Kwan;Chu, Yong Sik;Shim, Kwang Bo;Jeong, Jae Hyun
    • 한국세라믹학회지
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    • 제53권4호
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    • pp.435-443
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    • 2016
  • Coal ash, a material generated from coal-fired power plants, can be classified as fly ash and bottom ash. The amount of domestic fly ash generation is almost 6.84 million tons per year, while the amount of bottom ash generation is 1.51 million tons. The fly ash is commonly used as a concrete admixture and a subsidiary raw material in cement fabrication process. And some amount of bottom ash is used as a material for embankment and block. However, the recyclable amount of the ash is limited since it could cause deterioration of physical properties. In Korea, the ashes are simply mixed and used as a replacement material for cement. In this study, an attempt was made to mechanically activate the ash by grinding process in order to increase recycling rates of the fly ash. Activated fly ash was prepared by controlling the mill types and the milling times and characteristics of the mortar containing the activated fly ash was analyzed. When the ash was ground by using a vibratory mill, physical properties of the mortar mixed with such fly ash were higher than the mortar mixed with fly ash ground by a planetary mill.

석탄 분쇄기용 유성감속기 케이싱의 거동에 관한 유한요소해석 (Finite Element Analysis for the Behavior of the Casing of a Pulverizer Mill Planetary Gear Reducer)

  • 서지환;김선진;정민화;김병탁
    • 동력기계공학회지
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    • 제18권6호
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    • pp.34-39
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    • 2014
  • In this study, the structural analysis and the modal analysis are conducted to investigate the stress level, the deformation characteristics and the natural modes of the casing of a planetary gear reducer for a 800kW grade pulverizer mill. The casing is subjected to the load, 2800 kN, from the lump coals in the pulverizing process. Because of the symmetry, the half portion of the reducer casing is modeled for the stress analysis. But the full model is used to find out the eigenvalues and natural modes for the modal analysis. The contact conditions are applied between the thrust pad bearing and the adjacent contacting parts. The results shows that the casing structure has the sufficient strength and stiffness to support the load under consideration. ANSYS version 15 is employed to perform the numerical study.