Composite manufacturing method for seawater pump impeller nut

An impeller nut and a manufacturing method technology, applied in the field of sea water pumps, can solve the problems of the impeller nut being easy to corrode, susceptible to corrosion failure, thread wear, etc., so as to improve the toughness and corrosion resistance, the process plan is simple and easy to understand, and the service life is improved. Effect

Active Publication Date: 2022-02-01
HOHAI UNIV CHANGZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a component that restricts the axial translation of the impeller, the impeller nut also bears the erosion of seawater flow in the working state, and is extremely susceptible to corrosion failure
There are mainly two types of methods in the existing technology to solve the problem of easy corrosion of impeller nuts: one is to put a polymer anti-rust shell on the outer surface of the nut. The main disadvantage of this method is that the shell and the internal metal do not form an atomic connection. There are cracks in the outer shell, but this structure helps seawater to stay between the metal and the outer shell, and accelerates the corrosion of the metal; another process is to use high-alloy stainless steel precision casting impeller nuts as a whole, and its main disadvantage is that it is usually used for casting nuts The hardness of the stainless steel material is not high, generally less than 20HRC, and the impeller nut made of a single material is prone to thread wear or even stuck faults during use
Because of the low dilution rate of strip electroslag surfacing (less than 15%), the deposition efficiency is high
Ordinary martensitic welding core adopts the method of increasing the solid solution carbon content to increase the hardness of the surfacing layer, which brings problems of corrosion resistance and poor toughness, and cannot be directly applied to the manufacture of seawater pump impeller nuts

Method used

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  • Composite manufacturing method for seawater pump impeller nut
  • Composite manufacturing method for seawater pump impeller nut
  • Composite manufacturing method for seawater pump impeller nut

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A composite manufacturing method for a seawater pump impeller nut, comprising the following steps:

[0033] (1) Cast the base metal to be surfacing with cast steel, and clean the surface of the base metal;

[0034] (2) Use the surfacing material provided by the invention to deposit a layer of 316L stainless steel on the outer surface of the base metal

[0035] (3) cladding martensitic stainless steel on the inner cavity wall of the base metal with the wear-resistant electrode provided by the invention;

[0036] (4) According to the shape and surface material characteristics of the finished nut, set the moving path and process parameters of the milling cutter;

[0037] (5) Processing and milling out the outer surface of the nut;

[0038] (6) Tapping threads on the inner cavity of the base metal;

[0039] (7) Further processing as required, such as fine milling, polishing, etc.

[0040] Further, the process of cleaning the surface of the parent material in step (1) ma...

Embodiment 2

[0050] In order to get as Figure 4 The hexagonal prism-shaped impeller nut shown is manufactured using the composite manufacturing method provided by the present invention, and the process is as follows:

[0051] (1) Cast the base metal to be surfacing with cast steel, and clean the surface of the base metal. In this embodiment, ZG275-485H is preferably used as the casting material. The method of cleaning the surface of the base material includes trimming the flow channel, sanding to remove scale and sand inclusions, cleaning, dust removal and decontamination.

[0052] (2) Use the surfacing material provided by the invention to deposit the corrosion-resistant shell on the outer surface of the base metal by means of strip electroslag surfacing. The surfacing material is composed of welding strip and flux. The welding strip is 316L stainless steel with a cross-sectional size of 10mm×0.5mm, and the preferred preparation method of the flux is as follows.

[0053] Flux prepara...

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Abstract

The invention relates to the technical field of seawater pumps, and provides a compound manufacturing method for seawater pump impeller nuts, which includes the following steps: casting a base material to be surfacing with cast steel, and adopting a method of strip electroslag surfacing after the base material is cleaned A layer of 316L stainless steel is deposited on the outer surface of the base metal; martensitic stainless steel is deposited on the inner cavity wall of the base metal by electrode arc welding; the outer surface of the nut is processed and milled; threads are tapped on the inner cavity of the base metal. Through the above-mentioned process, the present invention can "put" a corrosion-resistant alloy shell on the outer surface of cast steel, and the inner cavity is made of martensitic stainless steel. The thread layer has excellent wear resistance, and the finished product has the advantages of wear resistance and corrosion resistance. , The service life is greatly improved compared with the traditional single material manufacturing impeller nut.

Description

technical field [0001] The invention relates to the technical field of seawater pumps, in particular to a compound manufacturing method for seawater pump impeller nuts. Background technique [0002] The seawater pump is a machine that transfers the mechanical energy of the motor to seawater. It is widely used in coastal firefighting, seawater desalination, tidal power generation and other occasions. The flow-passing parts of the seawater pump mainly include: suction chamber, pressure discharge chamber, impeller, impeller nut and pump casing. As a component that restricts the axial translation of the impeller, the impeller nut also bears the erosion of seawater flow in the working state, and is extremely vulnerable to corrosion and failure. There are mainly two types of methods in the existing technology to solve the problem of easy corrosion of impeller nuts: one is to put a polymer anti-rust shell on the outer surface of the nut. The main disadvantage of this method is tha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P15/00
CPCB23P15/00
Inventor 杨可刘思沾包晔峰
Owner HOHAI UNIV CHANGZHOU
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