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18CrNiMo7-6 steel carburization element shot blasting process

A technology of shot peening and carburizing, applied to spray guns, manufacturing tools, metal processing equipment, etc.

Inactive Publication Date: 2019-01-18
CHANGZHOU TIANSHAN HEAVY IND MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a kind of 18CrNiMo7-6 steel carburized part shot peening process, to solve the problem of lacking a kind of effective shot peening process for 18CrNiMo7-6 steel carburized part in the prior art

Method used

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  • 18CrNiMo7-6 steel carburization element shot blasting process
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  • 18CrNiMo7-6 steel carburization element shot blasting process

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Embodiment

[0048] The shot peening process parameters are shown in Table 2.

[0049] Table 2 Process parameters (gear diameter 1000mm)

[0050]

[0051] Perform performance testing on the products after shot peening.

[0052] Detection conditions: Proto-LXRD X-ray stress analyzer, tube voltage 30kV, tube current 25mA, Cr target K. Radiation, V filter, collimator diameter 1mm, Fe(211) diffraction crystal plane, X-ray elastic constant S 2 / 2=5.75×10-6 MPa -1 and S l =-1.28×10 -6 MPa -1 , left and right dual 512-channel position-sensitive detectors, corresponding to a 2θ range of 19°, 17 stations are optimally set within ±45°, co-inclined diffraction geometry, and ASTM-E915-2010, EN15305-2008 and GB7704-2008 standards are implemented for testing. With the help of Proto-8818 electrolytic polishing machine electrochemical corrosion, parameters 15V and 2A, saturated NaCl water electrolyte, digital display micrometer to measure the corrosion depth.

[0053] The test results of the r...

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Abstract

The invention relates to the technical field of shot blasting treatment, in particular to a 18CrNiMo7-6 steel carburization element shot blasting process. A 18CrNiMo7-6 steel carburization element isa wind power gear element with the diameter being greater than 1000mm. The process parameters are as followings: the shot conveying quantity is 10kg / min; the shot blasting pressure is 0.42Mpa; the rotating speed is 2.4 to 10rpm; the upward and downward walking speed is 38mm / min; the reciprocating times is 1 to 2; the shot blasting time is 11 to 34.4min. The shot blasting uses steel wires with thehardness being 58 to 63HRC for shot cutting; the diameter is 0.7mm, G2. When the process is used, the surface residual pressure of the steel carburization element reaches the requirement of 500MPa orhigher; the subsurface and the stress depth meet the requirements.

Description

technical field [0001] The invention relates to the technical field of shot peening, in particular to a shot peening process for carburized parts of 18CrNiMo7-6 steel. Background technique [0002] The shot peening process is a process that uses high-speed ejected projectiles to impact the surface of the workpiece to improve some mechanical properties of the part and change the surface state. When the projectile hits the surface of the part at high speed, it will cause plastic deformation on the surface, and this deformation will extend to the surface layer of the material, generating a compressive stress under the surface layer, thereby offsetting the bad tensile stress generated during the part manufacturing. The residual compressive stress delays the formation of fatigue fracture of the parts, thereby prolonging the safe service life of the parts. [0003] At present, shot peening has gradually become a necessary process for gear manufacturing. For the effect of shot pee...

Claims

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Application Information

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IPC IPC(8): B24C1/10B24C5/04B24C7/00B24C9/00
CPCB24C1/10B24C5/04B24C7/0061B24C9/006
Inventor 张林建吕蓝冰顾晓明
Owner CHANGZHOU TIANSHAN HEAVY IND MACHINERY
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