Silica sol precision casting has the advantages of high dimensional accuracy and good surface quality. It is a widely used advanced technology with little and no cutting. The use of silica sol casting method can save a lot of machine tools and processing man-hours, and also greatly save metal raw materials. . Silica sol casting is a widely used precision casting method in the field of precision casting. This precision casting method effectively reduces costs and improves the competitiveness of precision casting enterprises. Pouring molding is one of the most important steps in silica sol casting, so what are the common casting methods for silica sol casting?
1. Crystallize under pressure, put the shell in the pressure tank for pouring. After the end, immediately close the pressure tank, and pass high-pressure air or inert gas into the tank to solidify the casting under pressure to increase the density of the casting .
2. Vacuum suction pouring, put the shell in the vacuum pouring box, suck the gas in the cavity through the tiny pores in the shell, so that the liquid metal can fill the cavity better, copy the shape of the cavity, and improve Casting precision prevents the defects of porosity and insufficient pouring. This method is more common abroad.
3. Directional crystallization, some investment castings such as turbine blades, magnets, etc., if their crystalline structure is columnar crystals arranged in a certain direction, their working performance can be improved a lot, so investment casting oriented crystallization technology is rapidly Be developed.
4. Thermal gravity pouring, which is the most widely used pouring form, that is, after the shell is taken out of the roasting furnace, it is poured at high temperature.
