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

0 Cites 0 Cited by

AI-Extracted 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...

Method used

After the current two parameters are determined, shot peening intensity and coverage are determined by shot peening time, and shot peening time is determined by walking speed and reciprocating times up and down. The shot peening intensity is determined by the shot, speed, pressure, etc. The degree of plastic deformation and the coverage rate are mainly determined by the ...

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.

Application Domain

Blast gunsAbrasive feeders +1

Technology Topic

PeeningEngineering +2

Image

Examples

Experimental program(1)
Comparison scheme(2)

Example Embodiment

[0047] Example

[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 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, collimating tube 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 2θ range 19°, The angle is optimized to set 17 stations within ±45°, with the same inclination diffraction geometry, and the detection is in accordance with ASTM-E915-2010, EN15305-2008 and GB7704-2008 standards. With the help of Proto-8818 electrolytic polishing machine for electrochemical corrosion, parameters 15V and 2A, saturated NaCl water electrolyte, digital display micrometer to measure the corrosion depth.

[0053] The residual pressure test results are shown in Table 3. Among them, negative stress represents compressive stress.

[0054] table 3

[0055]

[0056] Conclusion: The surface meets the requirements of 500Mpa and above, and the subsurface and stress depth meet the requirements.

[0057] At the same time, the following comparative experiments were also carried out.

PUM

Property	Measurement	Unit
Diameter	>= 1000.0	mm
Diameter	0.7	mm
Hardness	58.0 ~ 63.0

Description & Claims & Application Information

We can also present the details of the Description, Claims and Application information to help users get a comprehensive understanding of the technical details of the patent, such as background art, summary of invention, brief description of drawings, description of embodiments, and other original content. On the other hand, users can also determine the specific scope of protection of the technology through the list of claims; as well as understand the changes in the life cycle of the technology with the presentation of the patent timeline. Login to view more.