Impeller investment casting process, impeller and centrifugal compressor

A technology of investment casting and impeller, which is applied in the field of impeller investment casting, impeller and centrifugal compressor, which can solve the problems of large fillet at the welding point, large dynamic balance of impeller, and poor dimensional accuracy of castings, etc., and achieve good tensile strength Strength and yield strength, improved energy efficiency of compressors, and high mold dimensional accuracy

Active Publication Date: 2018-12-21
GREE ELECTRIC APPLIANCES INC
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  • Claims
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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 la

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  • Impeller investment casting process, impeller and centrifugal compressor
  • Impeller investment casting process, impeller and centrifugal compressor

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Embodiment Construction

[0046] like figure 1 , 2 As shown, the impeller investment casting process proposed by the present invention includes steps 1 to 6 in a preferred embodiment, which will be described in detail below.

[0047] Step 1. Design the master mold and the single-piece core according to the size of the impeller. There are multiple single-piece cores assembled inside the master mold. The cavity between the master mold and the multiple single-piece cores is the investment cavity. The shape is the same as that of the impeller. In a preferred embodiment, the single-piece cores are in the same spiral shape as the blades 3 of the impeller, and the gap between two adjacent single-piece cores in the mother mold matches the shape of the blades 3 . From a structural point of view, multiple single-piece cores are assembled inside the mother mold to form a circular core mold group. The cavity between the top of the core mold group and the mother mold is in the shape of the wheel cover 2 of the im...

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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...

Claims

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Application Information

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IPC IPC(8): B22C9/04B22C9/10
CPCB22C9/043B22C9/10B22C9/103
Inventor 董磊尤宁丁惠文吴妙新王奇王腾飞郑方超蔡卓礼李海
Owner GREE ELECTRIC APPLIANCES INC
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