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Advances in Materials Science and Engineering
Volume 2016 (2016), Article ID 2317180, 12 pages
http://dx.doi.org/10.1155/2016/2317180
Research Article

Flow Dynamic Analysis of Core Shooting Process through Experiment and Multiphase Modeling

1School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
2Suzhou Mingzhi Technology Co., Ltd., Suzhou 215217, China

Received 23 August 2016; Revised 21 October 2016; Accepted 31 October 2016

Academic Editor: Pär Jönsson

Copyright © 2016 Changjiang Ni et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Core shooting process is the most widely used technique to make sand cores and it plays an important role in the quality of sand cores as well as the manufacture of complicated castings in metal casting industry. In this paper, the flow behavior of sand particles in the core box was investigated synchronously with transparent core box, high-speed camera, and pressure measuring system. The flow pattern of sand particles in the shooting head of the core shooting machine was reproduced with various colored core sand layers. Taking both kinetic and frictional stress into account, a kinetic-frictional constitutive correlation was established to describe the internal momentum transfer in the solid phase. Two-fluid model (TFM) simulations with turbulence model were then performed and good agreement was achieved between the experimental and simulation results on the flow behavior of sand particles in both the shooting head and the core box. Based on the experimental and simulation results, the flow behavior of sand particles in the core box, the formation of “dead zone” in the shooting head, and the effect of drag force were analyzed in terms of sand volume fraction (), sand velocity (), and pressure variation ().