In the Lost Foam Casting process, melting point temperature of metal, as well as volume and rate of the foam degradation have significant effect on the mold filling pattern. Therefore, gas generation capacity and gas gap length are two important parameters for modeling of mold filling time of the lost foam casting processes. In this paper, the gas gap length at the liquidfoam interface for a lo...

The presented article explores the impact that the formation of shrinkage cavities has on the heat transfer conditions in a mold. The conditions of heat dissipation have a significant impact on the rate of cooling of different parts of the casting, which in turn affects the microstructure formed in the casting. The results presented in this article should allow the reader to assess how signific...

Small sand molds for aluminum casting were produced by selective laser sintering (SLS) of pre-coated sands. A diode laser source with a rectangular laser beam spot was used to perform single and multi-layer processing tests. Subsequently, small sand molds were produced and tested in casting operations. Single layer processing was performed by changing laser power, scan rate and distance of the ...

The fuzzy neuron hybrid control method is proposed for mold level control of the continuous steel casting in this paper. The dynamic characteristics of the continuous steel casting process is described. To the plant with big uncertainties and grave nonlinearities, the fuzzy neuron hybrid control system is set up and the new model-free controller is designed. In this control system, the fuzzy ne...

analyzed using an EPMA. The results showed that the high hardness of the casting surface eould be decreased using the experimental investment. The hardness of the castings made from the experimental investment at a 25-50"m depth was lower than these frem the other investments, and the thickness of the hardened casting surface was 125/im. Layered structures with fewer layers were formed on the s...

The air-gap nucleation time, the stress evolution and the solid shell growth pattern are examined for different mold topographies to illustrate the potential control of aluminum cast surface morphologies during the early stages of solidification using proper design of mold topographies. The interaction between heat transfer and deformation during the early stages of solidification is considered...

The aim of conducting this research was to evaluate the viscosity change in the continuous casting of steel mold powders by altering their chemical compositions, using hot stage microscope analysis. 4 low-fluorine samples containing such compositions as MnO, Fe2O3, Li2O, TiO2 and ZnO, as well as another fluorine-free sample containing a combination of Fe2O3 and TiO2, were prepared in this resea...

Abstract: Further technology improvements to complex mature processes, such as the continuous casting of steel, require a combination of careful laboratory experiments, plant trials on the commercial process, and advanced computational models. As computer power increases, computational models are able to contribute more to the understanding, design, and control of these complex processes. Fluid...

The flow transport of a 420 ˆ 320 ˆ 90 mm beam blank continuous casting mold that used open-stream pouring combined with submerged refractory funnels was studied. By considering the dynamic similarity, geometric similarity, and air entrapment quantity similarity, a full-size water model was established. Meanwhile, the 3D mathematical models that included three phases were applied. Through the c...

Electromagnetic forces are an important tool to control fluid flow in the mold, combined with other casting conditions, nozzle, and mold geometry. Methods include static magnetic fields created by direct current, which apply a braking force in proportion to the flow velocity, and time-varying (travelling) magnetic fields, which actively drive the flow. The potential benefits of using magnetic f...