Silica sol casting has the advantages of high dimensional accuracy and good
surface quality. It is an advanced technology that is widely used. The use of
silica sol casting method can save a lot of machine tool equipment 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 a pressure tank for pouring. After finishing, 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 crystal structure is columnar crystals arranged in a certain direction, their work 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.
Generally, the passageway in valve bodies should be smooth, and considering the medium is corrosive, stainless steel valves made by silica sol casting process is the first choice.
How to shape the wax pattern is a crucial step in the production of valve body casting. Due to the bodies' complex cavities or long liner dimension, one-time molding unworkable for the wax pattern. So we usually use two moulds and then welding the separate wax patterns together. The method not only ensure the valve body forming one-time, but also decrease its cost.
The final step in production is pressure test. Each piece will be inspected to guarantee gas-tight and no leakage before delivery.
Silica sol casting belongs to lost wax casting, mainly used for products with high corrosion resistance and precision dimensions, since it have much better surface quality and less geometrical deviation of dimensions. The main silica sol steel castings we ever made include meat grinder parts, valve castings, pump castings, marine hardware, and furniture decoration etc.Usually, Silica sol casting parts tolerance within GB/T6414, CT5~6, weight range from 20 grams to 50 kilograms, the surface finish is Ra6.3.The above information is provided by investment casting manufacturer.
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