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Composite treating method for prolonging life of grating machine key components

A composite treatment and chain grate technology, which is used in heat treatment equipment, heat treatment process control, coating and other directions to improve mechanical properties, save resources and energy, and improve fatigue life.

Active Publication Date: 2008-07-23
江苏宏大特种钢机械厂有限公司
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  • Claims
  • Application Information

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Problems solved by technology

This technology overcomes the shortcomings of a single surface treatment method, and is not a simple superposition of two treatments. Using this composite treatment technology, the combination of nitriding process and oxidation process for key parts of the grate is realized; wear resistance and Combination of corrosion resistance; combination of heat treatment technology and cold treatment technology

Method used

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  • Composite treating method for prolonging life of grating machine key components
  • Composite treating method for prolonging life of grating machine key components

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Experimental program
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Effect test

Embodiment

[0023] Embodiment: First, non-destructive testing is carried out on the surface of the chain link of the chain grate, and two eddy current sensors are installed on the surface of the workpiece to be tested, and the weak area of ​​the mechanical performance of the part surface is determined through the detected sensor signal, and the compound treatment position is determined; the QPQ process flow is: Degreasing→preheating (350°C)→QPQ nitriding (520°C)→QPQ oxidation (370°C)→polishing→cooling→cleaning. For the grate material heat-resistant steel 30Cr21Mn8NiSi2NRe, after the QPQ process, the surface wear resistance reaches 23 times that of conventional quenching; after the QPQ process, laser shocks the chain link of the chain grate to improve its thermal fatigue resistance . Such as figure 2 As shown in the process of laser shock strengthening, when the laser output wavelength is 1.054 μm, the pulse width (FWHM) of the output laser is 22.1 ns, and the laser pulse energy is about...

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Abstract

The invention relates to a complex processing method for prolonging the service lift of chain grate key parts, belonging to mechanical manufacturing and material processing and application technical field, which comprises: firstly, surface nondestructive testing is carried out on the key parts of the chain grate of process; molten salt complex processing are carried out in parts of the surface according to the surface drawbacks tested by surface nondestructive testing; before the laser shocks, the workpiece surface is coated with black coating layer and use water as protective layer, and the laser shock processes the area which is easy to fatigue and fracture and has concentrated stress. The molten iron pretreatment spray-feeding device before iron-making blast furnace has the advantages of simple shortcut, high efficiency, low maintenance cost, short processing time (30 minutes to 5 hours), and the continuous operation can be realized, thus, high efficiency of production is ensured.

Description

technical field [0001] The invention relates to the technical field of mechanical manufacturing and material processing and processing applications, in particular to a compound treatment method for prolonging the service life of key components of a chain grate, and is especially suitable for improving the surface mechanical properties of materials for large-area and large-thickness gradient chain grate key parts. sex. Background technique [0002] In advanced manufacturing technology, laser shock processing technology, as a typical representative of high-energy beam, is a processing method with good prospects. Its principle is that the shock wave induced by high-energy short-pulse laser interacts with the material. The high-pressure shock wave generated improves the mechanical properties of the material, especially the fatigue life. This technology has been widely used in various industries such as mechanical engineering, shipbuilding, aviation, and microelectronics. At pre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/00C21D1/607C21D1/09C21D11/00C23F17/00C23C8/00
Inventor 朱圣才任旭东张永康冯爱新张西良李伯全司乃潮吴强
Owner 江苏宏大特种钢机械厂有限公司
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