Research On Vibration Analyze And Optimal Design Of Swing-type Ball Mill

Ultrafine Materials and nano-materials have been widely applied in the fields ofmetallurgy, chemical technology, life engineering, etc. High-energy ball mill （HEBM）,an important equipment for preparation of micro-materials and nano-materials bymechanical method or mechanical alloying, has been the focus of academic andindustrial research at home and abroad. Due to the complexity of kinetics parametersof grinding balls and behavior of material crushing in mill tank, and the limitations ofresearch methods in different periods, the relation among structural design parameters,experimental conditions and milling efficiency is still unclear so far. The research ofimproving milling efficiency by optimization of ball mill structure and experimentalprograms has important significances in theory and engineering.In this M.E. thesis, a swing-type ball mill was taken as the research object. Itsvibration characteristics and milling performance were analyzed. The millingconditions were optimized based on the movement of grinding balls. And a modifiedshape of the mill tank was proposed.Firstly, vibration model of the swing-type ball mill with single degree of freedomwas established. And three degree of freedom vibration model of the horizontaldirection and vertical direction were built respectively. Meanwhile, vibration modewas simulated by software. Secondly, the vibration characteristics of the swing-typeball mill and the dynamics characteristics of its cantilever were analyzed. Then, thedynamical model of the cantilever during swing was deduced, and the phenomenon ofprocession was analyzed. The results provided the bases for property analysis andoptimal design of the swing-type ball mill.The process of grinding balls collision of high-energy ball mill was analyzed.And the dynamical simulation models of swing-type ball mill and planetary ball millwere built respectively. The milling performance of swing-type and planetary ball millwere analyzed comparatively based on the collision energy of grinding balls and the movement form of mill tank. Then, the swing-type and planetary ball mill was testedby Ti₃AlC₂of mechanical alloying. The results of simulation and experiment bothshowed that the swing-type ball mill has a higher efficiency.The milling performance of swing-type ball mill was analyzed by grinding ballsmovement. In the basis of the relation between grinding balls kinetics and millingefficiency, the impacts on milling performance were analyzed, through discussing thespeed of ball mill，the number of grinding balls, the diameter of grinding balls, theshape of mill tank, and the volume of milling tank. At last, the optimal processparameters during ball milling were obtained, and a modified shape of mill tank wasproposed.