The shellof has cleaned the foam thoroughly and thoroughly through the roasting process before pouring liquid metal. Therefore, it thoroughly eliminated the unfriendly influence and trouble caused by the foam mold in the liquid metal forming process.
Very careful, always on tenterhooks, the casting process of foam casting is still using foam mold, dry sand without binder and pouring under negative pressure, so all the advantages of EPC are retained, but the carbon defect of foam is not as thin as ice and scary. The ingenious technology of shell casting is that the majority of foam mold is heated to liquid outflow cavity, not gasification. In order to avoid the production of large amounts of smoke and dust and environmental pollution, the roasting process of the shell not only completely eliminates the foam model, eliminates the source of carbon defects, and ensures that the material is not out of question; moreover, when the shell is roasted, the crystal water of the refractory aggregate of the coating shell is completely removed, and the source of defects such as stomata and hydrogen is eliminated, so we can confidently say ” In all the casting processes, the lost foam casting process is the only one with less casting defects. As long as the molten steel is pure and the feeding of the riser is sufficient, the casting defects can be avoided.
In the past, it is far fetched to say that lost foam casting belongs to the category of precision casting, while the casting process of hollow shell is a real investment casting. Hollow shell casting process can be used for large and complex precision casting, which is beyond the reach of traditional precision casting; the working environment of the hollow shell casting process is good, the shell making cycle is short, and the traditional precision casting is disappointed.
And resin sand, sodium silicate sand, V Compared with other casting processes such as French casting, the hollow shell casting process is not afraid of complex cavity, flexible model block, no draft angle, random position in the box, no core setting, no need to clean the flash burr, the obtained casting surface is smooth, the outline is clear, the size is accurate, and the selling appearance is good.
From a commercial point of view, the shell casting process is particularly suitable for high-end and high value-added castings such as low-carbon or zero carbon, ultra-complex or ultra-thin, multi alloy or high alloy.