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Laser intensifying method on metal surface of water pump parts

A metal surface, laser strengthening technology, used in the field of surface anti-corrosion, cavitation and wear strengthening technology, can solve the problems of inaccurate spraying area, cracks, deformation, etc., to improve the ability to resist abrasive wear, accurate positioning, The effect of increasing hardness

Inactive Publication Date: 2009-06-17
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It solves the problems of peeling, deformation, inaccurate spraying area and cracks caused by the current spraying method, and improves the hardness and corrosion resistance of the metal surface

Method used

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Embodiment Construction

[0013] The embodiment of the present invention is an RSW seawater pump impeller, and its material is: 316 stainless steel, and the implementation steps are as follows:

[0014] 1. According to the requirements for the treatment area of ​​the pump impeller, perform numerical control programming according to the profile of the water pump impeller: ensure that the laser beam is at the same distance and direction as the treatment part when lapping, and the action time is uniform.

[0015] 2. Cleaning treatment parts: use acetone, pine water, etc. to remove oil, rust, and scale.

[0016] 3. On the metal surface of the area to be treated, a coating layer composed of a mixture of alloy and adhesive is coated. The composition of the coating layer is: alloy 60%-70%, adhesive 30%-40%. The composition of the alloy is as follows: Cr: 15.0%-20.0%, B: 3.0%-4.5%, Si: 3.0%-4.5%, Fe<5.0%, W: 4.0-6.0%, Ni: the balance.

[0017] 4. Laser treatment: select a rectangular spot beam for laser treat...

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Abstract

A laser intensification technique is used for the metal surface of a water pump unit, especially applied to components worked in the aqueous medium such as its impeller, torus for surface anti-corrosive wear intensifying. After covers alloy materials in the demanding areas with metal surface, selects beams with special light spot to carry out laser scanning process in accordance with the dealing area, the average hardness of hardening can attain to HV450-700, decreased in gradient from outer to inner; The thickness of hardening can attain to more than 0.4mm; the width of harden ability band can be adjustable and controllable according to different technical requirements; and there is no treatment crack and deformation. The technique solved the problems such as deciduous, deformation formed from the arts of spray, and enhanced the hardness, anti-corrosion, antiwear and cavitation-resistance of metal surface as rustless steel.

Description

technical field [0001] The invention relates to a laser strengthening process for metal surfaces of water pump components, in particular to a strengthening process for surface corrosion, cavitation and wear of water pump impellers, mouth rings, rotors, shafts, pump bodies and other components working in water media. Background technique [0002] Water pump impellers, mouth rings and other components are important parts in industrial water pumps. The materials of water pump components are generally stainless steel, including: austenitic stainless steel, double molybdenum stainless steel, martensitic stainless steel, etc. Such as grades: 316 stainless steel, 0Cr17Ni12Mo2, 00Cr25Ni7Mo3N, 2Cr13 and other stainless steels with as-cast hardness of HV180-300. The wear of water pump components directly affects the normal operation of the equipment. For example: after six months of use of the seawater pump of Qinshan Third Nuclear Power Co., Ltd., it was found that the impeller had ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/09
Inventor 姚建华楼程华孙东跃
Owner ZHEJIANG UNIV OF TECH
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