Centrifugal pump impeller casting process

Abstract

The invention discloses a centrifugal pump impeller casting process. The process of conducting pouring according to a mold shell is the core of the centrifugal pump impeller casting process. The mold shell comprises a central hole corresponding to a to-be-cast impeller shaft hole so that the impeller shaft hole cannot be cast out. The centrifugal pump impeller casting process is characterized in that 2-4 axial ribs are evenly arranged along the circumference of the inner wall of the central hole of the mold shell so that a central columnar straight spure and 2-4 diversion inner spures connected into a whole together with the central columnar straight spure can be formed during pouring; and each diversion inner spure is formed by the area between the two corresponding adjacent ribs during pouring. By means of the process, it can be ensured that the shape and size of a shell mold are stable in the precise casting process, and therefore the impeller deformation shrinkage during casting is reduced, the impeller finished product percent of pass is increased, the efficiency of centrifugal pumps is improved, and the service life of the centrifugal pumps is prolonged.

Description

technical field [0001] The invention relates to a multistage centrifugal pump, in particular to a centrifugal pump impeller precision casting process, which belongs to the technical field of centrifugal pump impeller casting. Background technique [0002] Centrifugal pumps have complex structures and high precision requirements, so they have very strict requirements on the casting process. Especially the high-speed centrifugal pump impeller, as one of the key components affecting the working efficiency of multi-stage centrifugal pumps, has higher requirements on casting technology. The correctness of the impeller shape directly affects the efficiency of centrifugal pumps, and the degree of fit between product accuracy and design dimensions is high. Uniformity is the most important factor to ensure the efficiency of centrifugal pumps. At present, manufacturers in the pump industry all adopt precision casting methods to reduce the deformation of the impeller. The precision ca...

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Problems solved by technology

[0012] 3.1) Impact deformation, high temperature molten steel directly impacts the model in a short time, causing impact deformation

[0013] 3.2) The deformation during the solidification process is one of the processes with the largest amount of deformation. During the solidification shrinkage process, the shrinkage of the blade cover plate is hindered by the blade, and the deformation amount is small, but the central part shrinks without resistance, and the deformation proceeds along the axial direction, which in turn causes impeller overall deformation

[0014] In short, it is difficult to control the shrinkage and deformation of the blank by using the traditional center-no-casting process, which causes local shrinkage and deformation of the impeller, changes in the shape of the blade, and increases the difference between the product and the design calculation flow, head and other parameters, which makes it difficult for the impeller to achieve One of the root causes of the acceptance level

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