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Stainless steel water pump impeller investment casting process

A water pump impeller and investment casting technology, which is applied in the manufacture of tools, casting molding equipment, casting molds, etc., can solve the problems of high impeller defect rate, pig iron corrosion resistance, and durability are not as good as stainless steel, etc., to achieve low defect rate, Effect of long service life and cost reduction

Inactive Publication Date: 2019-07-09
宁波鑫象不锈钢制品有限公司
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0004] Traditionally, water pumps are mostly made of pig iron, but the corrosion resistance and durability of pig iron are far inferior to those of stainless steel; moreover, the impeller formed by fusion film casting has a high defect rate

Method used

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Embodiment Construction

[0059]The present invention will be described in further detail below.

[0060] A stainless steel water pump impeller investment casting process, including wax film molding, shell molding and impeller casting molding, wherein the wax mold molding steps are as follows:

[0061] A1. Crush the prepared wax block into (20~40mm)×(20~40mm) irregular small pieces and heat it to 80℃~95℃ to melt into a liquid state, then pour it into the mixing bucket to keep the wax water in liquid state.

[0062] A2, add wax powder while stirring the wax water, keep the temperature at 45°C~65°C, stir to make a paste, and lift the impeller of the mixer during stirring to facilitate paste. Here, wax powder is added to the liquid wax to facilitate the formation of the paste wax; the action of the impeller is conducive to reducing the mold particles in the paste wax and improving the quality of the paste wax.

[0063] A3. Pour the pasty wax into the injection molding machine, and the injection molding m...

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Abstract

The invention relates to the field of water pump impeller production, and discloses a stainless steel water pump impeller investment casting process. According to key points of the technical scheme, the stainless steel water pump impeller investment casting process comprises a wax mold forming process, a shell forming process and an impeller casting forming process. A formed wax mold has high quality, the hardness and air permeability of a formed shell are good, and the defect rate of a formed casting is low; rough machining can ensure that the dimensional accuracy of an impeller exit positionmeets the specified requirements, the exit width is uniform, and the error is small and ensured to be within a drawing tolerance range; after roughing machining and trimming, a large amount of stressis generated in the impeller casting; and after stress-relieving heat treatment, low-temperature stress relief is performed to stabilize the size and ensure the dimensional accuracy after machining.A stainless steel water pump impeller machined by the stainless steel water pump impeller investment casting process has a low defect rate, small dimensional deformation, good impeller machining dimensional accuracy, high surface smoothness and a long impeller service life.

Description

technical field [0001] The invention relates to the field of impeller production, in particular to an investment casting process for a stainless steel water pump impeller. Background technique [0002] The investment casting process is a molding method in which molten metal is poured into a mold and solidified to obtain a metal blank with a certain shape, size and performance. [0003] The technological process of investment casting is: wax mold pressing→wax mold assembly→sanding→dewaxing→shell roasting→pouring, in which the wax mold assembly process and the cooling conditions of the mold shell have an important impact on the quality of the casting. [0004] Traditionally, water pumps are mostly made of pig iron, but the corrosion resistance and durability of pig iron are far inferior to those of stainless steel; moreover, impellers formed by fusion film casting have a high defect rate. Therefore, it is necessary to design a production process for manufacturing water pump i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/04B22C9/28
CPCB22C9/04B22C9/28
Inventor 朱国荣李武建
Owner 宁波鑫象不锈钢制品有限公司
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