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

Inactive Publication Date: 2011-03-23
SHAANXI UNIV OF SCI & TECH
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Problems solved by technology

[0003] In order to solve the serious impact of defects such as shrinkage porosity, shrinkage cavity, pores, air bubbles, hot cracks, and cold cracks on the quality of casting blanks during the manufacturing process of complex metal casting blanks, the present invention provides a set of Internal gas pressure improves the crystal structure of castings and improves the quality of rough castings with complex cavities

Method used

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  • Internal pressure expansion type casting technique
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Embodiment Construction

[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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Abstract

The present invention relates to inner pressure bulging casting technology, and gas pressure inside mold cavity with metal casting blank is controlled so as to improve the crystal structure of the casting and raise the quality of complicated casting. During making mold core, casting caps are set in the positions corresponding to the openings in the casting blank; and after pouring, the casting caps and the casting blank form one sealed casing and the gas pressure inside the cavity of the casting blank is controlled through the gas ducts on the casting caps, so as to realize negative pressure pouring and high pressure solidifying.

Description

technical field [0001] The invention relates to a manufacturing technology of a metal casting blank, in particular to a set of technologies for improving the crystal structure of a casting and improving the quality of a complex casting blank by controlling the gas pressure inside the cavity of the casting blank. Background technique [0002] During the manufacturing process of metal casting blanks, defects such as shrinkage porosity, shrinkage cavities, pores, air bubbles, hot cracks, and cold cracks have a serious impact on the quality of casting blanks. The production practice has proved that a good crystalline structure can be obtained when the molten metal is solidified under external pressure, which can ensure the quality of the casting blank; but for the casting blank with complex cavity, the sequential solidification process is difficult to achieve, and the die casting process The loss along the pressure transmission is very large, and it is difficult to meet the feed...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D18/00
Inventor 陈海峰李瑞虎乔丽洁王建梅胡鹏睿王永琴赵正文
Owner SHAANXI UNIV OF SCI & TECH
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