Internal pressure expansion type casting technique
A technology of bulging and internal pressure, applied in the field of casting blank quality with complex cavity, to prevent shrinkage porosity and shrinkage cavities, reduce manufacturing costs, and prevent cold cracks
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[0011] The following takes the casting process of the valve body as an example to specifically illustrate the internal pressure expansion casting technology.
[0012] Resin and molding sand are used to manufacture a core (2) with good thermal collapsibility and air permeability. When the core (2) is manufactured, the positions corresponding to each opening of the casting blank (10) on the core (2) are respectively Set the plug (3), the material composition of the plug (3) is the same as or close to that of the casting blank (10), the thickness of the plug (3) is 1 to 5 times the wall thickness of the casting blank (10), and the other external dimensions The opening is the same as that of the casting blank (10); a vent main pipe (7) and a vent side pipe (4) are arranged inside the core (2), and the vent main pipe (7) passes through one or more plugs (3), and The plug (3) that it passes through is sealed and connected, and the other plugs (3) are respectively fixedly connected w...
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