Impeller investment casting process, impeller and centrifugal compressor

Abstract

The invention discloses an impeller investment casting process, an impeller and a centrifugal compressor. The impeller investment casting process comprises the following steps: (1) a female mold and single molding cores are designed according to the size of the impeller; (2) the female mold and the single molding cores are manufactured; multiple single molding cores are put in the female mold to assemble as an investment mold; (3) the investment mold is used for manufacturing a fired mold; and the single molding cores in the female mold are embedded in the fired mold; (4) the female mold is disassembled; and the fired mold is used for manufacturing a molding shell; (5) metal liquid is poured in the molding shell to obtain a casting; and (6) the aftertreatment is performed on the casting. The impeller investment casting process has the advantages of high mold precision, high impeller forming quality and the like.

Description

technical field [0001] The invention relates to the technical field of impeller manufacturing technology, in particular to an impeller investment casting process, an impeller and a centrifugal compressor. Background technique [0002] In the prior art, the impeller is usually processed in two ways, one is split-type welding processing, for example, the utility model patent with the notification number CN202756297U, which discloses a new manufacturing process for a large centrifugal compressor impeller formed by high-precision machining , the wheel hub and wheel cover are processed separately, and then the wheel hub and wheel cover are welded to shape. The utilization rate of the forging material is low, the impeller processing time is long, and the welding causes large deformation of the blade, welding bumps in the impeller flow channel, and large rounded corners at the welding place. The initial dynamic balance of the impeller is large. [0003] The other is integral proce...

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Problems solved by technology

[0002] In the prior art, the impeller is usually processed in two ways, one is split-type welding processing, for example, the utility model patent with the notification number CN202756297U, which discloses a new manufacturing process for a large centrifugal compressor impeller formed by high-precision machining , the wheel hub and wheel cover are processed separately, and then the wheel hub and wheel cover are welded to shape. The utilization rate of the forging material is low, the impeller processing time is long, and the welding causes large deformation of the blade, welding bumps in the impeller flow channel, and large rounded corners at the welding place. The initial dynamic balance of the impeller is large

[0003] The other is integral processing. For example, the invention patent with the publication number CN103433435A discloses a manufacturing process of a titanium alloy integral impeller. The integral impeller is obtained by using a light-cured rapid prototyping model. The molding time is long and the surface roughness of the casting is large. , The dimensional accuracy of castings is poor, and the cost of mold manufacturing is expensive, the accuracy of molds is difficult to guarantee, and the shelling of castings is difficult

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