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Door rod strengthening technology for air pump recycling regulation door

A recirculation and door adjustment technology, which is applied in metal material coating process, molten spraying, coating, etc., can solve problems such as uneven quenching thickness and blown sealing surface, so as to improve wear resistance and increase service life , The effect of simple process operation

Inactive Publication Date: 2012-01-25
广州市天河区金棠表面工程技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The sealing surface hardened by heat treatment process (nitriding or quenching), due to the thin hardened thickness (less than 0.1mm after quenching) or uneven quenching thickness, once the hardened layer partially fails, the sealing surface will be quickly and severely blown.

Method used

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  • Door rod strengthening technology for air pump recycling regulation door
  • Door rod strengthening technology for air pump recycling regulation door

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] see figure 1 , the supersonic spraying strengthening process of the door lever of the steam pump recirculation adjustment door, the steps are as follows:

[0026] 1. Primary processing:

[0027] Grind the stem part of the door lever 1 to a thickness of 0.18mm;

[0028] Second, the workpiece surface purification:

[0029] Use an oxygen-acetylene flame gun to bake the surface of the door lever 1 with a flame, and the surface temperature of the workpiece is 100°C:

[0030] 3. Surface pretreatment:

[0031] 12 # Brown corundum sand is used to sandblast the surface of the door lever 1, and the compressed air pressure is 0.5kg / cm 2 , the surface roughness after blasting reaches Sa3 level;

[0032] 4. Spraying metal ceramic coating

[0033] Use supersonic flame spray gun to face the door, the surface of the rod part of 1 is sprayed with metal ceramic coating 2, the material is NiCr-Cr 2 C 3 Spraying powder; the flame center line of the spray gun intersects the axis of...

Embodiment 2

[0039] see figure 1 , the supersonic spraying strengthening process of the door lever of the steam pump recirculation adjustment door, the steps are as follows:

[0040] 1. Primary processing:

[0041] Grind the stem part of the door lever 1 to a thickness of 0.19mm;

[0042] Second, the workpiece surface purification:

[0043] Use an oxygen-acetylene flame gun to flame-bake the surface of the door lever 1, and the surface temperature of the workpiece is 120°C;

[0044] 3. Surface pretreatment:

[0045] 12 # Brown corundum sand is used to sandblast the surface of the door lever 1, and the compressed air pressure is 0.6kg / cm 2 , the surface roughness after blasting reaches Sa3 level;

[0046] 4. Spraying metal ceramic coating

[0047] Use a supersonic flame spray gun to spray a cermet coating 2 on the surface of the door lever 1, and the material is NiCr-Cr 2 C 3 Spraying powder; the flame center line of the spray gun intersects the axis of the workpiece perpendicularl...

Embodiment 3

[0053] see figure 1 , the supersonic spraying strengthening process of the door lever of the steam pump recirculation adjustment door, the steps are as follows:

[0054] 1. Primary processing:

[0055] Grind the stem part of the door lever 1 to a thickness of 0.20mm;

[0056] Second, the workpiece surface purification:

[0057] Use an oxygen-acetylene flame gun to flame-bake the surface of the door lever 1, and the surface temperature of the workpiece is 150°C;

[0058] 3. Surface pretreatment:

[0059] 12 # Brown corundum sand is used to sandblast the surface of the door lever 1, and the compressed air pressure is 0.7kg / cm 2 , the surface roughness after blasting reaches Sa3 level;

[0060] 4. Spraying metal ceramic coating

[0061] Use a supersonic flame spray gun to spray a cermet coating 2 on the surface of the door lever 1, and the material is NiCr-Cr 2 C 3 Spraying powder; the flame center line of the spray gun intersects the axis of the workpiece perpendicularl...

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Abstract

The invention discloses a door rod strengthening technology for an air pump recycling regulation door, which comprises the following steps of: 1. preliminary working: abrading the rod part of the door rod to remove the thickness of 0.18-0.20mm; 2. workpiece surface purification: purifying the surface until the surface is free from macroscopic oil stains; 3. surface pretreatment: carrying out abrasive blasting on the surface of the rod part of the door rod by 12# brown fused alumina sand, wherein the pressure of compressed air is 0.5-0.7kg / cm<2>, and the surface roughness after abrasive blasting reaches Sa 3 level; 4. metal ceramic coating spraying: spraying a metal ceramic coating on the surface of the rod part of the door rod by a supersonic speed flame spray gun, wherein the material is NiCr-C2C3 spraying powder, the flame center line of the spray gun and the axis of the workpiece are intersectant with the error within + / -5 degrees, the spraying distance is 220-250mm, parameters are controlled as follows: 15-18SCFM (standard cubic foot per minute) of O2, and 200-240SCFH (standard cubic foot per hour) of C3H6, and the temperature of the workpiece is controlled to below 200DEG C; and 5. mechanical processing of the coating. In the door rod strengthening technology, the supersonic speed spraying coating replaces a chromium coating so as to improve the abrasive resistance of the door rod, and the door rod strengthening technology is convenient to operate, is flexible and efficient, is environmentally-friendly and protects environment.

Description

technical field [0001] The invention relates to a process for surface strengthening of a door lever of a steam pump recirculation regulating door, in particular to a process for surface strengthening of a door lever of a steam pump recirculation regulating door of a steam turbine power plant by supersonic flame spraying. Background technique [0002] Steam pump recirculation adjustment door core, door seat, and door rod are important accessories of steam turbines in power plants, which directly affect the efficiency and economic benefits of power generation. Due to severe erosion, internal leakage often occurs within a year due to erosion of the sealing surface, which wastes energy. The working medium of the door core, door seat and door rod of the existing steam pump recirculation regulating door is water, the medium temperature is 200°C, and the pressure is 35MPa. The base material of the imported door core is 410SS, and the base material of the door seat is 316SS. The ro...

Claims

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Application Information

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IPC IPC(8): C23C4/14C23C4/06C23C4/129
Inventor 谢家浩黎兆荣曾良李运初姚孝寒乐有树冯碧洸高海青李建雄
Owner 广州市天河区金棠表面工程技术有限公司
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