Cr4Mo4V steel bearing powerful shot blasting and heating injection/permeation composite surface strengthening method

A composite surface and shot peening technology, which is applied in the direction of ion implantation plating, coating, metal material coating technology, etc., to achieve the effect of improving fatigue life, improving surface hardness and simple method

Active Publication Date: 2015-12-23
HARBIN INST OF TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the existing single shot blasting technology cannot make the Cr4Mo4V steel bearing have an ideal surface strengthening and life extension effect, and to provide a composite surface strengthening method for Cr4Mo4V steel bearings with strong shot peening and temperature rise infiltration

Method used

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  • Cr4Mo4V steel bearing powerful shot blasting and heating injection/permeation composite surface strengthening method
  • Cr4Mo4V steel bearing powerful shot blasting and heating injection/permeation composite surface strengthening method

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specific Embodiment approach 1

[0023] Specific implementation mode one: this implementation mode is a composite surface strengthening method of Cr4Mo4V steel bearing strong shot peening and temperature rise injection infiltration, which is completed as follows:

[0024] 1. Powerful shot peening: The Cr4Mo4V steel bearing raceway is treated with a strong shot peening process, and a deformation strengthening layer with a thickness of 500 μm to 700 μm is formed on the surface of the Cr4Mo4V steel bearing raceway;

[0025] The instrument used in the powerful shot peening process is a mechanical centrifugal shot peening machine. The centrifugal speed of the mechanical centrifugal shot peening machine is 2000r / min~5000r / min. The material of the shot is reinforced steel shot, and the microhardness of the shot is HRC58~ HRC63, the diameter is 1mm~2mm, the distance from the nozzle to the Cr4Mo4V steel shaft is 300mm~500mm, the shot peening flow rate is 50kg / min~200kg / min, the shot peening speed is 100m / s~200m / s, and ...

specific Embodiment approach 2

[0040] Embodiment 2: The difference between this embodiment and Embodiment 1 is that in step 1, the Cr4Mo4V steel bearing raceway is treated with a powerful shot peening process, and a deformation strengthening layer with a thickness of 600 μm is formed on the surface of the Cr4Mo4V steel bearing raceway. Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0041] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: the instrument used in the powerful shot peening process described in step one is a mechanical centrifugal shot blasting machine, and the centrifugal force of the mechanical centrifugal shot blasting machine is The speed is 3000r / min, the projectile material is reinforced steel shot, the microhardness of the projectile is HRC58~HRC63, the diameter is 1.2mm, the distance from the nozzle to the Cr4Mo4V steel shaft is 400mm, the shot peening flow rate is 100kg / min, and the shot peening speed is 150m / s, the shot peening time is 3min, the spray angle is θ=50°, and the surface coverage is 100%. Other steps are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses a Cr4Mo4V steel bearing powerful shot blasting and heating injection/permeation composite surface strengthening method, relates to a Cr4Mo4V steel bearing composite surface strengthening method, and aims to solve the problem that a traditional single shot blasting technology cannot enable a Cr4Mo4V steel bearing to have an ideal surface strengthening lifetime extension effect. The method comprises the steps of: (1) powerful shot blasting; (2) grinding of blasted shot surfaces; and (3) heating injection/permeation. Compared with a non-treated Cr4Mo4V steel bearing, the Cr4Mo4V steel bearing treated by the method has the advantages that the fatigue life is prolonged by 3 times or above, the corrosion resistance is improved by 50%, the surface hardness is improved by 20% or above, the limit load is improved by 500 MPa, the dry friction coefficient is reduced from 0.8 to 0.2 and the wear rate is 25% of the original wear rate. The method is suitable for the surface treatment of the Cr4Mo4V steel bearing.

Description

technical field [0001] The invention relates to a compound surface strengthening method of a Cr4Mo4V steel bearing. Background technique [0002] Cr4Mo4V steel bearings are currently widely used high-temperature bearings. They are characterized by high high-temperature strength, high-temperature overload resistance, and good toughness. The operating temperature is generally between 200°C and 350°C. Cr4Mo4V steel bearings are used in key parts of major equipment such as aero-engine main shaft bearings, gas turbine main shaft bearings, and aerospace engine high-temperature bearings. Improving the fatigue life of Cr4Mo4V steel bearings is of great significance for increasing the service life and safety of various aircraft. [0003] Shot peening is a widely used method to improve the fatigue life of the workpiece. Its principle is to use high-speed projectiles to hit the surface of the workpiece to form a deformation strengthening layer whose surface stress state is compressive...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D7/06C23C14/48C23C14/02
Inventor 唐光泽马欣新王黎钦吴廷宝杨树新蒋瑞秋
Owner HARBIN INST OF TECH
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