Numerical Simulation Analysis Of High-speed Compaction Of Iron-based Powder

Powder metallurgy technology is an important process of manufacturing high-techmaterialswith high utilization rate of materials, low manufacturing cost, good materialcomprehensive performances, etc. As the development of aerospace, navigation andautomobile industries, the operation performance of powder metallurgical (PM) parts aredemanding increasingly. High velocity compaction because of its high density, low cost,uniform density distribution, lower ejection pressure and springback, and many otheradvantages has become the focus of research in recent years. Rely on the traditionalexperimental method to study of high-speed compacting process is time-consuming,laborious and effect is not very good. At present, most scholars using the finite elementmethod based on the continuum and discrete element method based on discrete in powdercompaction, which have made a lot of achievements, but both methods can not accuratelyinspect the mesoscopic changes in the pressing process. So this paper used finite elementmethod based on discrete body with the finite element software MSC/Marc to study themesoscopic deformation of powder particles and obtain further effective measures toimprove the density uniformity.At first, this paper analyzes the development of high velocity compaction technologyand the research status of the powder pressing process simulation at home and abroadsystematically. Combined with the needs of products of actual powder metallurgyand putforward the main research content of this project. Then we introduced theapplication ofelastic-plastic finite element method in the process of high speed press forming andseveral classic suppression equations. Experiment for the friction coefficient of thedifferent powder materials in the different pressing forces, obtained the frictioncoefficient relation to thedifferent materials and the coefficient and densityrelation to thedifferent force, which provided the friction parameters and the standards of densitychanges to the simulation.Two-dimensional particle model is set up according to the characteristics of powdercompaction.Two-dimensional particle model is set up according to the characteristics ofpowder compaction.Finite element softwareMarc was used to study the influence ofsuppression speed, quality of heavy hammer and the interface friction on the density,deformation, elastic aftereffect and law of motion of powder particles in the process of compaction. Analyzed the movement of typical particle, the stress and deformationcharacteristicsin pressing process and established the relationship between aggregates ofpowder and individual particles. The characteristic of powder under the condition ofhigh-speed repression and traditional static forming were compared andanalyzed, and gotwhen under the same average crushing force, powder under high-speed compaction canreach higher density, better uniformity of density, and can suppress the parts products ofgreater height to diameterratio.The research results can improve powder compactingprocess, optimization of powder technology parameters of high-speed pressingtechnologyand havetheimportantsignificance on theoretical guidanceand practical valueof engineering.