Precision Casting Method for Concave and Convex Complicated Castings
A technology of precision casting and casting, applied in the precision casting field of ), to achieve the effect of uniformly oriented columnar crystal structure and effective heat dissipation
Active Publication Date: 2016-03-23
DONGFANG TURBINE CO LTD
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Problems solved by technology
[0004] The object of the present invention is to provide a casting with a complex shape with concave and convex ends that can be fine and uniform during directional solidification in view of the structural particularity of the above-mentioned castings with a complex shape with concave and convex ends and the problems existing in the precision casting process. Precision Casting Method for Directional Solidification Structure
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[0019] The present invention is a precision casting method for complex shape castings with concave and convex ends (such as gas turbine guide vanes, etc.). structure. see figure 1 , the present invention comprises the following sequential steps:
[0020] 1). Make a wax mold according to the designed casting with concave-convex complex shape at the end, and set a heat conductor at the concave-convex end of the wax mold. The heat conductor is formed of graphite material with high temperature resistance and excellent thermal conductivity. The top surface of the heat conductor has a matching The concave-convex structure of the concave-convex end of the wax mold, the heat conductor and the concave-convex end of the wax mold form a clearance fit, so that the two can be fitted and separated, that is, the two are assembled with a gap; the side of the heat conductor corresponds to the concave-convex end of the wax mold. Outer profile, the bottom surface of the heat conductor is a pla...
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Abstract
The invention discloses a precision casting method for a complex casting with a concave-convex end. The precision casting method comprises the following steps: 1) manufacturing a wax mold according to a designed casting, and arranging a thermal conductor which is matched with the profile and has a planar bottom surface at the concave-convex end of the wax mold; (2) manufacturing a ceramic mold shell on the wax mold and the side surface of the thermal conductor, embedding the thermal conductor into the bottom of the ceramic mold shell; (3) placing the ceramic mold shell into a vacuum directional solidification furnace, wherein the thermal conductor is tightly contacted with the surface of a water cooling copper plate; (4) starting the vacuum directional solidification furnace, preheating, and insulating the heat of the ceramic mold shell; pouring high-temperature alloy liquid into the ceramic mold shell, and uniformly and effectively radiating the water cooling copper plate through the thermal conductor, wherein the high-temperature alloy liquid is solidified from bottom to top to form a directional column grain structure along with the temperature reduction from the ceramic mold shell to a cooling chamber; (5) after the directional solidification, taking out the ceramic shell, and breaking the ceramic shell to take out the casting and the thermal conductor. By adopting the method, the radiating and solidifying conditions of the concave-convex end are remarkably improved, so that the formed complex casting with the concave-convex end obtains a fine and uniform directional column grain structure.
Description
technical field [0001] The invention relates to a precision casting method for castings, in particular to a precision casting method for castings with complex concave and convex ends (such as gas turbine guide blades, etc.). Background technique [0002] In order to improve the high-temperature performance of castings, castings are usually cast using directional solidification technology in the precision casting process, that is, through a certain method, the liquid metal in the mold shell is directional solidified from bottom to top, so that the formed castings can obtain vertical orientation. columnar structure. [0003] Based on the forming principle of directional solidification of castings in the precision casting process, in the vacuum directional solidification furnace, after the superalloy liquid is poured into the ceramic mold shell, it is chilled by the water-cooled copper plate, and the heat of the superalloy liquid is transmitted downwards. The ceramic formwork ...
Claims
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IPC IPC(8): B22C9/04B22C9/22
Inventor 马德新杨功显张琼元王海洋巩秀芳刘艳领
Owner DONGFANG TURBINE CO LTD