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Method for prolonging service life of key parts and components of production equipment of chain cage machine - rotary kiln ball lumps

A rotary kiln and chain grate technology, applied in heat treatment equipment, heat treatment baths, manufacturing tools, etc., can solve problems such as the inability to meet the requirements of material properties, and achieve the effects of restoring geometric dimensions, enhancing hardness, and improving surface friction reduction.

Inactive Publication Date: 2007-12-26
江苏宏大特种钢机械厂有限公司 +1
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AI Technical Summary

Problems solved by technology

At present, heat-resistant steel is usually used to manufacture related parts, but its high-temperature wear resistance and thermal fatigue are still the key factors affecting the thermal life of parts. Requirements of the new process of cold machine production on the material performance of its key parts

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: laser cladding + QPQ + laser shock strengthening, improve the wear resistance of the chain link material of the chain grate machine, and improve the fatigue life of the material.

[0021] First, the pre-set laser cladding is used to clad the chain link of the chain grate machine. The self-fluxing alloy powder is selected as high-hardness iron-nickel-chromium-silicon-boron alloy powder Fe60. Its main feature is that it contains boron and silicon, so it has self-deoxidation. And the performance of slagging, when the alloy is remelted, the boron and silicon in the alloy are oxidized, and a film is formed on the surface of the coating. In the laser cladding process, the self-fluxing alloy powder is placed on the cladding part on the surface of the substrate (chain grate chain link) in advance, and then scanned and melted by laser beam irradiation. The self-fluxing alloy powder is added in the form of powder, The power of the laser beam is 2200W, the irradiatio...

Embodiment 2

[0024] Embodiment 2: Laser cladding + laser shock strengthening, improving the wear resistance of the chain grate plate whose main material is high temperature wear and tear failure. During the operation of the chain grate plate, there is a phenomenon that the temperature rises due to friction; in the light case, there will be poor lubrication and increased wear, and in severe cases, it will cause burns, seizures, etc. For the material of the chain grate plate, its high temperature wear performance is relatively poor High, in this embodiment, laser cladding + laser shock strengthening is adopted, the implementation process is similar to that of embodiment 1, the difference is that the QPQ treatment is omitted, and the self-fluxing alloy powder is selected as high-hardness iron-nickel-chromium-silicon-boron alloy Powder Fe60, after laser cladding treatment, the wear-resistant thickness of the grate plate surface is about 3mm, the number of crack initiation cycles is increased to...

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Abstract

This invention relates to a method for prolonging the service life of key components of long-chain grate machine-rotary kiln pellet production apparatus. The method comprises: performing laser cladding / hardening treatment on the surfaces of the components by using laser thermal effect to improve surface hardness, performing salt bath treatment on the surfaces of the components by using QPQ process to form a compact bath treatment hardening layer with high friction resistance, and performing laser shock reinforcement on the surfaces of the components by using laser shock technique to form a stress layer with high amplitude residual pressure, which can effectively improve the surface mechanical properties of the components, and largely improve the anti-fatigue service life and anti-stress corrosion performance of the component. The method can improve the mechanical strength of key components so that they are hard at the surface and tough inside.

Description

technical field [0001] The invention relates to the technical field of metallurgical equipment parts manufacturing and laser special processing, in particular to a method for prolonging the life of key parts of the grate machine-rotary kiln pellet production equipment, which is used to improve the chain grate machine-rotary kiln pellet production equipment The laser shock composite life extension technology of wear resistance and thermal fatigue life of key parts is not only suitable for grate plates, shovel plates, side plates and other parts that mainly fail due to high temperature wear, to improve their wear resistance; it is also suitable for small shafts , sprockets, chain links and other parts that are mainly damaged by thermal fatigue to improve their thermal fatigue life. Background technique [0002] Grate machine-rotary kiln-circular cooler is one of the important production processes for iron and steel smelting furnace materials. Its working temperature is a gradi...

Claims

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Application Information

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IPC IPC(8): C21D1/09B24B1/00C21D1/46
Inventor 朱圣财冯爱新任旭东张永康张西良李伯全司乃潮吴强许晓静
Owner 江苏宏大特种钢机械厂有限公司
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