Laser strengthening process for metal leaf

A laser strengthening, metal blade technology, applied in metal processing equipment, laser welding equipment, manufacturing tools and other directions, can solve the problems of uneven hardness, complex process, difficult temperature control, etc., to achieve automatic processing and production, accurate beam positioning. Effect

Active Publication Date: 2005-04-06
ZHEJIANG UNIV OF TECH
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AI Technical Summary

Problems solved by technology

In order to improve the water erosion resistance of blades, there are mainly the following technological methods at present: (1) Flame quenching and strengthening: flame heating and quenching on the steam outlet side of the blades. (2) High-frequency induction heating and quenching: This process uses induction heating and then low-temperature tempering to produce tempered martensite with a thickness of 2-6mm, which can improve efficiency, but the induction heating equipm

Method used

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  • Laser strengthening process for metal leaf
  • Laser strengthening process for metal leaf
  • Laser strengthening process for metal leaf

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Embodiment Construction

[0014] Combine below Figure 1 ~ Figure 3 The embodiment of the present invention is described in detail. The blade of the embodiment of the present invention is composed of a crown 1 and a root 2, and the material is 2Cr13, in a tempered state. Before the treatment, pre-determine the area and overlap of the treatment leaf crown 1, and perform numerical control programming according to the shape of the treatment part of the leaves, make the positioning fixture of the leaves, clean the treatment area, and apply alloy light-absorbing paint. The laser spot is a rectangular laser spot of 10mm×2mm, and the inert gas is protected during processing.

[0015] Taking the manufacturing steps of SK / MK56-3 gas turbine blades as an example, the description is as follows:

[0016] 1. According to the requirements of the processing area, carry out NC programming according to the blade shape line, the program block diagram is as follows figure 1 As shown, the program code is as follows:

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Abstract

The invention relates to a metal leaf laser strengthening technology. After the surface of the metal required processing area is coated alloy extinction coating, the light beam with certain facula selected by the processed area is practiced laser processing. The laser location and moving in the processed area are realized the light beam three-dimensional motion by the digital control programming of the leaf local processed area shaped conductor. At the same time, the inert gases are used to protect the action area, and the average hardness of the local hardened layer reaches from HV four hundred and fifty to HV six hundred and fifty. And it is reduced with gradient from the outer to inner. The depth of the single side hardened layer is more than 0.25 millimeter. The width of the hardened band is adjustable, and it has no processed crack, deformation. The invention solves the deformation problem when the metal blaze is practiced induction hardening. And the hardness is higher than from ten percent to twenty percent of the induction hardening.

Description

technical field [0001] The invention relates to a metal surface laser strengthening process, which is suitable for the surface strengthening of rotating metal blades, especially for the surface strengthening of the blades of the steam inlet part of a steam turbine. Background technique [0002] Metal blades are one of the important parts in some machinery and equipment. The life and wear of the blades directly affect the normal operation of the equipment. Although the mechanism of fatigue damage has been understood, the problem of blade life has not been resolved due to many factors affecting blade life, and blade failure accounts for more than 30% of various equipment failures. For example: The thermal power 300,000-kilowatt feed water pump unit produced by Hangzhou Steam Turbine Group Co., Ltd. adopts NK50 / 60 condensing type, and its final stage adopts HK56-3 blades, which are responsible for converting the thermal energy of steam into mechanical ...

Claims

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Application Information

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IPC IPC(8): B23K26/18C21D1/00
Inventor 姚建华陈智君孙东跃
Owner ZHEJIANG UNIV OF TECH
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