• Title/Summary/Keyword: a traditional ball 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.

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

  • Bor, Amgalan;Sakuragi, Shiori;Lee, Jehyun;Choi, Heekyu
    • Korean Journal of Materials Research
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    • v.25 no.6
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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 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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    • 2009.11a
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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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Effect of Friction Coefficient from DEM Simulation in Grinding Zone of the Ball Mill (볼 밀의 분쇄장에서 DEM 시뮬레이션을 통한 마찰계수 영향)

  • Jargalsaikhan, Battsetseg;Bor, Amgalan;Uranchimeg, Khulan;Lee, Jehyun;Choi, Heekyu
    • Korean Journal of Materials Research
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    • v.31 no.5
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    • pp.286-295
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    • 2021
  • This study attempts to find optimal conditions of the friction coefficient using a discrete element method (DEM) simulation with various friction coefficient conditions and three different grinding media with various ball sizes in a traditional ball mill (TBM). Using ball motion of the DEM simulation are obtained using the optimal friction coefficient compared with actual motion; photographs are taken by the digital camera and the snapshot images are analyzed. In the simulation, the rotation speed of the mill, the materials and velocity of the grinding media, and the friction coefficient between the balls and the wall of the pot are fixed as the actual experimental conditions. We observe the velocity according to the friction coefficient from the DEM simulation. The friction coefficient is found to increase with the velocity. Milling experiments using a traditional ball mill with the same experimental conditions as those of the DEM simulation are conducted to verify the simulated results. In addition, particle morphology change of copper powder is investigated and analyzed using scanning electron microscopy (SEM) for the milling experiment.

A Comparative Study for Grinding Media Behavior and DEM Simulation at Actual Grinding Zone on a Traditional Ball Mill (매체형 전동밀의 실제 분쇄장에서 분쇄매체의 거동과 DEM 시뮬레이션의 비교연구)

  • Bor, Amgalan;Jargalsaikhan, Battsetseg;Lee, Jehyun;Choi, Heekyu
    • Korean Chemical Engineering Research
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    • v.57 no.6
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    • pp.804-811
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    • 2019
  • This study was performed the real motion and DEM simulation of ball motion using three different types of grinding media with different size and materials in media formation for optimization of process conditions in a traditional ball mill (media ball mill). In the simulation, the rotational speed of the mill, the material of the medium, the velocity of the medium, and the coefficient of friction between the media and the wall of pot were fixed into the actual experimental conditions. The motion of various kinds of grinding media was quantitatively measured by setting the grinding zone defined in the present study on the photographs taken and the snapshot images analyzed in the simulation. In addition, we observed the quantitatively measured value and the changed morphology of the sample and examined the correlation. Therefore, it is suggested to optimize the grinding media which has the greatest influence on the grinding zone under specific experimental conditions.

Particle Morphology Change and Different Experimental Condition Analysis during Composites Fabrication Process by Conventional Ball Mill with Discrete Element Method(DEM) Simulation (전동볼밀을 이용한 금속기반 복합재 제조공정에서 분쇄매체차이에 대한 입자형상변화와 DEM 시뮬레이션 해석)

  • Ichinkhorloo, Batchuluun;Bor, Amgalan;Uyanga, Batjargal;Lee, Jehyun;Choi, Heekyu
    • Korean Journal of Materials Research
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    • v.26 no.11
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    • pp.611-622
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    • 2016
  • Particle morphology change and different experimental condition analysis during composite fabrication process by traditional ball milling with discrete element method (DEM) simulation were investigated. A simulation of the three dimensional motion of balls in a traditional ball mill for research on the grinding mechanism was carried out by DEM simulation. We studied the motion of the balls, the ball behavior energy and velocity; the forces acting on the balls were calculated using traditional ball milling as simulated by DEM. The effect of the operational variables such as the rotational speed, ball material and size on the flow velocity, collision force and total impact energy were analyzed. The results showed that increased rotation speed with interaction impact energy between balls and balls, balls and pots and walls and balls. The rotation speed increases with an increase of the impact energy. Experiments were conducted to quantify the grinding performance under the same conditions. Furthermore, the results showed that ball motion affects the particle morphology, which changed from irregular type to plate type with increasing rotation speed. The evolution was also found to depend on the impact energy increase of the grinding media. These findings are useful to understand and optimize the particle motion and grinding behavior of traditional ball mills.

Particle Morphology Behavior and Milling Efficiency by DEM Simulation during Milling Process for Composites Fabrication by Traditional Ball Mill on Various Experimental Conditions - Effect of Rotation Speed, Ball Size, and Ball Material (전동볼밀의 복합재 제조공정에서 각종 실험조건에 따른 입자형상 변화 및 DEM 시뮬레이션을 통한 밀링 효율의 고찰 - 회전속도, 매체크기, 매체재질의 영향)

  • Bor, Amgalan;Batchuulun, Ichinkhorloo;Jargalsaikhan, Battsetseg;Lee, Jehyun;Choi, Heekyu
    • Korean Chemical Engineering Research
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    • v.56 no.2
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    • pp.191-203
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    • 2018
  • This study was investigated the effect of the morphology change of copper (Cu) powders under the different rotational speed and milling time by using three kinds of grinding media with different size and materials, and performed DEM simulations of ball behavior. In order to clarify the mechanism of grinding by three - dimensional simulations of the ball behavior in a traditional ball mill, the force, kinetic energy, and medium velocity of the grinding media were calculated. In the simulation, the amount of change of the input energy was also calculated by adjusting the rotational speed, ball material, kinetic velocity, and friction coefficient in the same as the actual experimental conditions. The scanning electron microscope results show that the particle morphology changes from irregular to spherical when the ball size is small.

Study on the Grinding Characteristic of MWCNT and Al2O3 Composite by Using Planetary Ball Mill (유성 볼밀을 사용한 MWCNT와 Al2O3의 혼합 분쇄 특성에 관한 연구)

  • Seo, Chang-Myung;Kim, Yeong-Geun;Ji, Myoung-Kuk;Jeong, Hyo-Min;Chung, Han-Shik
    • Journal of Power System Engineering
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    • v.17 no.1
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    • pp.91-96
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    • 2013
  • The present paper focuses on the fabrication of materials with higher thermal conductivity. Nanofluid is a novel transfer prepared by dispersing nanometer-sized solid particles in traditional heat transfer fluid to increase thermal conductivity and heat transfer performance. The purpose of this study is making the nano-size particle. The experiment of MWCNT and $Al_2O_3$ was carried out using a planetary ball mill at several rotation speeds: 200 ~ 400 rpm. The results were examined using scanning electron microscope(SEM). In the case of the MWCNT, it could be more grinding into the small particle in the dry condition and it confirm in the case of the $Al_2O_3$ to be more grinding into the small particle contrary to the MWCNT in the wet condition. In the mixture grinding result of MWCNT and $Al_2O_3$, the dry condition showed the good result in low rotation speed than the wet condition.