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Impact loading occurs when a moving object collides with a stationary structure, such as a rod with a uniform cross-sectional area fixed at one end. Under these conditions, the rod absorbs the kinetic energy from the striking object, leading to deformation and subsequent stress development. As the rod returns to its original position and reaches maximum stress, the absorbed energy, initially manifested as kinetic energy, transforms entirely into strain energy.
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Processing of Bulk Nanocrystalline Metals at the US Army Research Laboratory
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Impact Load Behavior between Different Charge and Lifter in a Laboratory-Scale Mill.

Zixin Yin1,2, Yuxing Peng3,4, Zhencai Zhu5,6

  • 1School of Mechatronic Engineering, China University of Mining & Technology, Xuzhou, 221116 China. yinzixincumt@126.com.

Materials (Basel, Switzerland)
|August 5, 2017
PubMed
Summary

Investigating mill processing, Discrete Element Method (DEM) simulations revealed impact forces on lifters are influenced by mill speed and filling. DEM simulations accurately predict power draw, unlike the Bond model for ball mills.

Keywords:
DEM simulationball millimpact forceload behaviorpower draw

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Area of Science:

  • Mechanical Engineering
  • Materials Science
  • Computational Science

Background:

  • Mill processing efficiency and lifter longevity are significantly impacted by the charge-lifter interaction.
  • Factors influencing this impact include mill speed, filling levels, lifter geometry, and media shape.
  • Discrete Element Method (DEM) is a powerful tool for analyzing granular processes.

Purpose of the Study:

  • To investigate the multi-body impact load behavior in a laboratory-scale mill.
  • To improve grinding efficiency and extend lifter lifespan.
  • To compare DEM simulation results with experimental data and existing models.

Main Methods:

  • Conducted a series of experiments on a laboratory-scale mill.
  • Employed Discrete Element Method (DEM) simulations to model impact load behavior.
  • Compared DEM-derived power draw with measured power draw and the Bond model.

Main Results:

  • DEM simulations showed good approximation for measured power draw, outperforming the Bond model for ball mills.
  • Impact force on lifters is sensitive to mill speed, media filling, lifter height, and ore particle presence.
  • Specific findings include impact force ranges at critical speeds, effects of media filling (20% optimal for higher forces), and decreased impact force with increased lifter height (above 200 N) and iron ore addition.

Conclusions:

  • DEM is a reliable method for predicting power draw in mill processing.
  • Optimizing mill speed (70-80% critical speed) and media filling (20%) can enhance impact forces.
  • Lifter height and iron ore addition influence impact force dynamics, suggesting avenues for process optimization.