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Laser repair method for worn bearing cylinder of gas turbo-expander

A turbo expander and laser repair technology, which is applied in the coating process and coating of metal materials, can solve the problems affecting the life of the bearing cylinder and achieve the effect of improving performance

Active Publication Date: 2011-07-20
河北瑞兆激光再制造技术股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the traditional surfacing welding repair method, there are a lot of slag inclusions, pores, and cracks in the bearing cylinder, which seriously affects the service life of the bearing cylinder, so companies generally replace new equipment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0021] Example 1: Preparations before repair: first disassemble the bearing cylinder to be repaired; measure the size of each part of the bearing cylinder, clean up dust, grease, rust, etc. as a whole, the surface of the workpiece is derusted and polished with metallographic sandpaper, and then Clean with acetone and high-purity alcohol. Remove the fatigue layer of the worn part, remove 0.5-1mm. Then fix the bearing cylinder with tooling: the inner diameter is fixed with two supporting mandrels, the outer diameter is fixed with three fixing sleeves, and 36 bolts with a diameter of 30mm are fastened; the bearing cylinder is preheated to 80-150°C. During the repair process: after the above work is ready, configure the metal alloy powder required for laser repair according to the detected results. The cladding powder contains 4% carbon, 27% chromium, 45% nickel, 24 % Fe, the main wear-resistant hard phase Cr in the cladding layer 7 C 3 ; Debug the laser, adjust the operating d...

example 2

[0022] Example 2: Preparation before repair: first disassemble the bearing cylinder to be repaired; measure the size of each part of the bearing cylinder, clean up the dust, grease, rust, etc. as a whole, the surface of the workpiece is derusted and polished with metallographic sandpaper, and then Clean with acetone and high-purity alcohol. Remove the fatigue layer 0.5-1mm of the worn part. Then fix the bearing cylinder with tooling: the inner diameter is fixed with two supporting mandrels, the outer diameter is fixed with three fixing sleeves, and 36 bolts with a diameter of 30mm are fastened; the bearing cylinder is preheated to 80-150°C. During the repair process: after the above work is ready, configure the metal alloy powder required for laser repair according to the detected results. The cladding powder contains 2.5% carbon, 24.5% chromium, 45% nickel, 28 % Fe, the main wear-resistant hard phase Cr in the cladding layer 7 C 3 ; Debug the laser, adjust the operating da...

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Abstract

The invention discloses a laser repair method for a worn bearing cylinder of a gas turbo-expander after wear. The method comprises the following steps of: detecting the size of each part of a bearing cylinder matrix of the gas turbo-expander before repair and determining a worn part and the size of the worn part; smoothly grinding the surface of a workpiece; cleaning to remove a fatigue layer of a damaged part of the bearing cylinder; detecting hardness and components of the material of the bearing cylinder matrix; preparing nickel-based alloy powder according to a detection result, preheating the bearing cylinder to the temperature of between 80 and 150 DEG C and fixing the bearing cylinder on a laser machine tool; adjusting operating data of a laser, setting parameters of a laser cladding technology, prearranging a powder layer with thickness of 2mm, and performing laser cladding on the damaged part of the bearing cylinder; and detecting and finishing after repair. The method has the advantages that: a repair layer has a few cracks and has high fusion rate with a raw material, the performance is greatly improved after repair, and the like.

Description

technical field [0001] The invention relates to a repair method for a bearing cylinder of a blast furnace gas expansion turbine, in particular to a laser repair method for a worn out bearing cylinder of a TRT gas turbine expander. Background technique [0002] If the amount of gas dust in the blast furnace gas expansion turbine (TRT for short) exceeds the standard, the rotor blades and the bearing cylinder will be severely scoured, often causing the inner diameter of the bearing cylinder to be eroded. With the traditional surfacing welding repair method, there are a large number of slag inclusions, pores, and cracks in the bearing cylinder, which seriously affect the service life of the bearing cylinder, so companies generally replace new equipment. With the shortage of resources, it has become the goal of many enterprises and scientific research institutions to find new technologies to develop the surface repair technology of TRT bearing cylinders. Contents of the inventi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10
Inventor 韩宏升付宇明唐学锋郑丽娟
Owner 河北瑞兆激光再制造技术股份有限公司
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