Open Access

ARTICLE

Numerical Simulation of Multi-Layer Penetration Process of Binder Droplet in 3DP Technique

Xiangyu Gao, Weidong Yang^*, Hongxuan Xian, Xiyuan Tu, Yuanyuang Wang^*

School of Mechanical Engineering, Hebei University of Technology, Tianjin, 300130, China

* Corresponding Authors: Weidong Yang. Email: ; Yuanyuan Wang. Email:

(This article belongs to the Special Issue: Design & simulation in Additive Manufacturing)

Computer Modeling in Engineering & Sciences 2020, 124(1), 227-241. https://doi.org/10.32604/cmes.2020.09923

Received 28 January 2020; Accepted 19 March 2020; Issue published 19 June 2020

Abstract

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.

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