Influence of core sand properties on flow dynamics of core shooting process based on experiment and multiphase simulation

Ni, Chang-jiang; Lu, Gao-chun; Jing, Tao; Wu, Jiun-Huei Proty

doi:10.1007/s41230-017-6118-y

Cited by 8 publications

(3 citation statements)

References 15 publications

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“…In the case of inorganic additives, spherical micro-silica particles are often chosen to improve the flowability of the sand mixture. More information on flowability can be found in various references [7][8][9][10][11][12]. A micrograph of such a type of micro-silica is shown in Figure 20.…”

Section: On the Influence Of Micro-and Nano-sized Spherical Particlesmentioning

confidence: 99%

Methods to Determine, Influence and Improve the Flowability of Sand Mixtures

Haanappel¹

2022

Casting Processes

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Due to increasing environmental awareness, more and more foundries started to replace the organic binders with an environment-friendly binder system based on inorganics. However, inorganic binder systems can only replace the conventional organic binders if all requirements, set by the foundry industry are being fulfilled. One of these is the production of high-quality cores, indicative of good compaction, no surface defects, and high surface smoothness. Such types of cores can only be manufactured when the sand mixture shows sufficient flowability. This chapter presents a study on the flowability of various types of sand mixtures all including inorganic binder systems finally to be used for the production of sand cores for the foundry industry. Results have shown that the flowability of sand mixtures can be modified and improved by (1) the addition of small amounts of surface-active agents and/or (2) well-chosen additives characterized by micro-sized spherical particles. The addition of only a few amounts of surface-active agents resulted in a significant improvement of flowability and thus of core quality. Similar results were achieved with the use of small concentrations of spherical micro-sized particles.

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Section: On the Influence Of Micro-and Nano-sized Spherical Particlesmentioning

confidence: 99%

Methods to Determine, Influence and Improve the Flowability of Sand Mixtures

Haanappel¹

2022

Casting Processes

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“…The core shooting process is the most widely used to make cold box sand cores in the metal casting industry, 1,2 and the qualities of the sand box are significantly affected by sand properties, ratio of binders, temperature, tooling design and manufacturing parameters. The core shooting process includes two stages: filling and compressing.…”

Section: Introductionmentioning

confidence: 99%

Simulation of Sand Filling Process and Analysis of Flow Behavior with Different Binder Ratio

et al. 2019

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Core shooting process has a great influence on the quality of sand cores. At present, there are two computational fluid dynamic models applied to simulate the hydrodynamics of core shooting process. In this paper, a two-fluid model (TFM) simulation is made on fluid dynamic analysis. With validation of experimental results and discrete particle model (DPM) simulations, the TFM is able to predict a reasonable flow behavior of sand particles by gas dynamic pressure analysis. Residual gas distribution of sand filling process is analyzed and a good agreement is achieved between air volume fraction simulation based on TFM and experimental results. A comparison between different binder ratios is made. The binder ratio has a significant effect on sand hydrodynamic behavior and the sand volume fraction.

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“…Out of the parameters deciding on the processes of the mould cavity filling and moulding sand compaction the influence of such factors as: kind of the core sand and its reclaim [1][2][3][4][5][6][7][8][9], complication of the core shape, shooting pressure value, recommended surfaces and dimensions of shooting and venting holes, should be taken into account. The mentioned subjects, concerning traditional core binders (oil or linseed varnish, water glass, some resins for the hot-box process), were previously investigated [10][11][12][13][14][15][16][17][18], while analogous investigations for core sands with the inorganic Cordis binder -introduction of which into the foundry practice holds promise of decreasing pollution of the natural environment -were not performed.…”

Section: Introductionmentioning

confidence: 99%

Archives of Metallurgy and Materials

Dańko

2018

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The results of studies of the cores production by blowing methods with utilising the modified experimental shooting machine SR-3D, are provided in the hereby paper. The core sands from the Cordis technology were applied in the presented investigations. The influence of the number and distribution of vents on the shaped core box filling, filmed by a digital camera, was determined. Investigations were performed for the shooting pressures of 0.4, 0.5 and 0.6 MPa and for three surfaces of the shooting hole, at various numbers and distribution ways of vents in the experimental core box. The selected results of the model investigations were compared with the results of simulations performed previously in the PROCAST programme.The intensity of the core sand outflow from the shooting chamber into the core box of the experimental shooting machine was measured. Technological effects were assessed on the basis of the core sand apparent density in individual parts of the core, in dependence on the character of the pressure increase in the shooting chamber and the pressure value obtained in the core box.

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Influence of core sand properties on flow dynamics of core shooting process based on experiment and multiphase simulation

Cited by 8 publications

References 15 publications

Methods to Determine, Influence and Improve the Flowability of Sand Mixtures

Methods to Determine, Influence and Improve the Flowability of Sand Mixtures

Simulation of Sand Filling Process and Analysis of Flow Behavior with Different Binder Ratio

Archives of Metallurgy and Materials

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