Research On Powder Tamping Model In Long And Thin Metal Tube Based On Multi-scale Approach

These days, there are few researches on charging slender metal tube with powder,and the conventional stuffing technology cannot achieve the requirements of stuffingprocess. Therefore, the stuffing technology which was used currently is based onconsolidating process. Due to the lack of analysis about models, the parameters ofcharging process are determined through a lot of manually trial and priori experience.During the process, lacking of analysis of the characteristic about particles, andobjective understanding about the effect of consolidating process, contribute to theinefficient of parameter optimization. Therefore, this paper will analyze the motioncharacteristics and its distribution of powder particle under consolidating process, andestablish the multi-scale evolution model of powder particle, then obtain the revolutionconsequence under consolidating process, lay the foundation for the subsequentoptimization of consolidating process.According to the technological characteristics of slender tube’s free-falling tampingprocess, this paper analyzes the physical movement characteristics of drug particleswhich is in the slender tube during tamping process from the point of Particle physicsmechanics and Powders mechanics. This paper studies the feature of distribution ofgranular systems by studying the change of state characteristics of tamping drugparticles system, meanwhile, this paper obtains the accordance of multi-scale divisionand divides the macro-scale into meso-scale. After the division, this paper proposes theidea of multi-scale modeling, and builds the evolving model of drug particles system intamping process whose modeling process contains two parts, meso-scale evolvingmodeling and the connection of meso-scale and macro-scale. In order to verify themulti-scale model, this paper designs homologous automatic charging test, andcompares the test outcome with the evolution model results.In summary, this paper does a detailed study of powder’s movement characteristicsand feature of distribution directs at slender metal tube’s drug tamping process. Then,the study builds the deep understanding of powder movement during drug tampingprocess. The establishment of multi-scale evolution model for the tamping process has aguiding significance for the process optimization and important application value in thefuture.