This paper studies the binder droplet injection process in the 3DP technique.The mathematical model of the binder penetration process for multi-nozzle and multi-layer in 3DP technique is established,by using the conse...This paper studies the binder droplet injection process in the 3DP technique.The mathematical model of the binder penetration process for multi-nozzle and multi-layer in 3DP technique is established,by using the conservation Level set method.According to the two-dimensional plane model of three-dimensional spatial structure of sand bed,the construction method of an equivalent cylindrical mapping infiltration model is proposed to represent the porosity of the model in the two-dimensional plane,which is exactly the same as that in the three-dimensional space,as well as closer to the arrangement of the three-dimensional space,and to realize the differentiation between the pores and the throats.The method of spraying droplets alternately by multiple nozzles simulates the staggered arrangement of multiple array-type nozzles and prints the current layer completely at one time.The numerical simulation of multi-layer penetration process is realized by using the method of continuous multi-simulation.The simulation model of the binder penetration process by using multi-nozzle and multi-layer is established to simulate the whole process of the binder from the nozzle to impacting on the sand bed and then to penetrating into the sand bed,which reflects the complete penetration process and predicts the sand agglomeration.展开更多
基金funded by the Natural Science Foundation of Hebei Province,China(Grant No.E2016202297)the Tianjin science and technology plan project(Grant No.18YFCZZC00150).
文摘This paper studies the binder droplet injection process in the 3DP technique.The mathematical model of the binder penetration process for multi-nozzle and multi-layer in 3DP technique is established,by using the conservation Level set method.According to the two-dimensional plane model of three-dimensional spatial structure of sand bed,the construction method of an equivalent cylindrical mapping infiltration model is proposed to represent the porosity of the model in the two-dimensional plane,which is exactly the same as that in the three-dimensional space,as well as closer to the arrangement of the three-dimensional space,and to realize the differentiation between the pores and the throats.The method of spraying droplets alternately by multiple nozzles simulates the staggered arrangement of multiple array-type nozzles and prints the current layer completely at one time.The numerical simulation of multi-layer penetration process is realized by using the method of continuous multi-simulation.The simulation model of the binder penetration process by using multi-nozzle and multi-layer is established to simulate the whole process of the binder from the nozzle to impacting on the sand bed and then to penetrating into the sand bed,which reflects the complete penetration process and predicts the sand agglomeration.
