Calibration of particle properties and numerical simulation of sand-laying process based on discrete element
In binder jetting 3D printing,the quality of the sand bed directly affects the quality of the final printed parts.The particle nature of the sand particles during the laying of the sand layer is one of the key factors affecting the quality of the sand bed.In order to study the effect of particle properties on the quality of sand bed in inkjet printing,raw sand was used as the research object,and the contact parameters between sand particles were calibrated through a combina-tion of experiment and discrete element simulation,and the contact parameters of coated sand were studied,use the sur-face energy between particles to describe the change of sand particle fluidity,and get the relationship between catalyst content and surface energy through a combination of experiment and simulation.Based on the determination of the prop-erties of the sand particles,a discrete element model of the sand bed laying process in the inkjet printing process was constructed,and the simulation experiment of the impact of particle properties on the sand laying quality was completed.The results show that the increase in the catalyst content will reduce the sand bed quality,but too low catalyst content will result in poor dimensional accuracy and mechanical strength of the parts.Therefore,in order to balance the solidifi-cation efficiency and the quality of the sand bed,the catalyst content can be controlled between 0.4%and 0.6%;under the condition of a certain layer thickness and falling sand quality,the particle size coefficient is the main parameter that affects the quality of the sand bed.The decrease of the diameter coefficient will lead to the deterioration of the quality of the sand bed.
binder jetting 3D printingdiscrete elementsand laying processthe quality of sand bedparticle properties
NETL
NSTL
万方数据
