• Title, Summary, Keyword: Planetary mill

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

  • Sakuragi, Shiori;Bor, Amgalan;Lee, Jehyun;Choi, Heekyu
    • Particle and aerosol research
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    • v.11 no.1
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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

  • Choe, Hui-Gyu;Choe, Gyeong-Pil;Bae, Dae-Hyeong;Lee, Seung-Baek;Lee, Ung;Kim, Seong-Su
    • Proceedings of the Materials Research Society of Korea Conference
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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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FEA of Copper Tube Rolling Process Using the Planetary Rolling Mill (유성압연기를 사용한 동관 압연공정의 유한요소해석)

  • Lee, Jung-Kil;Han, Ki-Beom;Kim, Kwan-Woo;Choe, Jong-Woong;Kim, Jae-Hun;Cho, Hae-Yong
    • Journal of Advanced Marine Engineering and Technology
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    • v.34 no.2
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    • pp.303-309
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    • 2010
  • Copper tube rolling process using the planetary rolling mill has been studied by using finite element method. This rolling is process that makes copper tube by three-roll with mannesmann method. Also, rolling process has started from the cold working and finished to the hot working. This rolling process has more advantage that make reduction of process and cost than existing extrusion. This process includes various and complex process parameters. Each of the process parameters affects forming result. Therefore, all of the process parameters should be considered in copper tube rolling. Rolling process for copper tube was successfully simulated and it should be useful to determine optimal rolling condition.

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

  • Lee, B.H.;Ahn, K.B.;Bae, S.W.;Bae, S.W.;Khoa, H.X.;Kim, B.K.;Kim, J.S.
    • Journal of Korean Powder Metallurgy Institute
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    • v.22 no.3
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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.

Comparative study of the particle morphology changes in copper powder using various media mills

  • Amgalan, B.;Shiori, S.;Ichinkhorloo, B.;Uyanga, B.;Lee, Jehyun;Ochirkhuyag, B.;Choi, H.
    • Geosystem Engineering
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    • v.20 no.3
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    • pp.149-162
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    • 2017
  • An experimental investigation has been conducted on grinding of copper powders using different ball-milling machines. A various parameters including rotation speed and grinding time and ball sizes are used to change the particle morphology of the copper powders. The effects of the ball mill operation condition on the morphology of Cu powders in the dry-type milling process using three different types of ball mill: traditional ball mill (TBM), stirred ball mill (SBM), and planetary ball mill (PBM). A new evaluation method, which can provide relatively accurate results, is used to analyze and compare the grinding performance of three different ball millings. The experimental results suggest that the particle size and morphology of copper particle can easily be controlled by changing grinding conditions of these ball millings. The results were systematically analyzed using scanning electron microscopy (SEM) and particle size analyzer (PSA).

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

  • 김대영;김강언;이명교;정수태
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.16 no.8
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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.

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
    • Journal of the Korean Ceramic Society
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    • v.53 no.4
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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.

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

  • Seo, Ji-Hwan;Kim, Seon-Jin;Jung, Min-Hwa;Kim, Byung-Tak
    • Journal of Power System Engineering
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    • v.18 no.6
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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.