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Powder and cladding method for self-lubricating laser cladding for high-speed and heavy-duty journals

A laser cladding and self-lubricating technology, applied in coating, metal material coating process and other directions, can solve problems such as damage to the lubricating surface, rapid wear of journals, scratches on the surface of friction pairs, etc., to improve working life and avoid continuous The effect of scratching, good containment effect

Active Publication Date: 2018-10-26
辽宁思达思克控股有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The above methods basically use Cr-Mo alloys or Cr-Ni-Fe alloys and increase the surface hardness to enhance the wear resistance of the journal. However, when fine impurities and wear particles enter the friction pair, excessive High hardness will instead cause abrasive particles to scratch the surface of the friction pair, and then damage the lubricating surface, resulting in the formation of grooves. Therefore, improving the resistance of the friction pair to fine impurities and particles is the key to improving the life of the journal.
[0009] To sum up, the existing journal material, surface treatment process and surface repair process are all limited to improving the wear index under normal working conditions, which is extremely common in actual production due to the rapid wear of the journal due to external impurities entering the friction pair. no effective inhibition

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The composition of the self-lubricating laser cladding powder used for high-speed heavy-duty journals contains Cr 38%, WS by weight percentage 2 38%, Fe 13.5%, Ti 6.5%, C4%; of which WS 2 The particle size is ≤7000 mesh, and the particle size of other components is ≤400 mesh.

[0030] The preparation method is:

[0031] Prepare WS with a particle size of ≤7000 mesh according to the above composition ratio 2 Powder, and powders of Ti, C, Fe and Cr with a particle size of ≤400 mesh, all the powders are mixed uniformly with a mixer and then dried to remove moisture; the C is selected from graphite.

[0032] The cladding method is carried out in the following steps:

[0033] Grind the working part of the journal to be treated to remove the oxide layer and rust, and wipe the surface with a cloth after grinding;

[0034] The laser cladding device is adopted, and the self-lubricating laser cladding powder used for high-speed and heavy-duty journals is automatically sent in...

Embodiment 2

[0038] The composition of the self-lubricating laser cladding powder for high-speed heavy-duty journals contains Cr 48%, WS 2 28%, Fe 15.5%, Ti 5.5%, C 3%; Others are the same as embodiment 1;

[0039] Preparation method is with embodiment 1;

[0040] Cladding method is the same as embodiment 1, and difference is:

[0041] The cladding process parameters are: focusing mirror f=350mm, laser power P=4000W, focusing spot diameter: D=3mm, scanning speed V=400mm / min, lap rate T=50%, and the cladding formed after cladding is completed The thickness of the layer is 0.7mm, the surface hardness is HRC56, and the surface friction coefficient is 0.2; the composition of the cladding layer is CrS 6%, Ti 4 C 2 S 2 19%, WC15%, TiWC 2 18%;

[0042] A set of 600MW generators produced by Dongfang Electric Machinery Factory in service in a power plant found that the steam end of the main shaft was worn during the annual inspection. The factory decided to use laser cladding to repair it, an...

Embodiment 3

[0044] The composition of the self-lubricating laser cladding powder for high-speed heavy-duty journals contains Cr 58%, WS 2 18%, Fe 17.5%, Ti 4.5%, C 2%; Others are the same as Example 1;

[0045] Preparation method is with embodiment 1;

[0046] Cladding method is the same as embodiment 1, and difference is:

[0047] The cladding process parameters are: focusing mirror f=400mm, laser power P=5000W, focusing spot diameter: D=4mm, scanning speed V=400mm / min, lap rate T=40%, and the cladding formed after cladding is completed The thickness of the layer is 0.6mm, the surface hardness is HRC57, and the surface friction coefficient is 0.2; the composition of the cladding layer is CrS 9%, Ti 4 C 2 S 2 16%, WC12%, TiWC 2 15%;

[0048] The annual inspection of the hot rolling production line of a steel rolling mill found that the wear of the contact surface reached 10-15mm. It was decided to use the argon arc welding surfacing welding method to restore the size and repair. Th...

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Abstract

Discloses are self-lubricating laser cladding powder for a high-speed heavy-duty journal and a cladding method. The powder comprises components, by weight percentage, 38-58% of Cr, 18-38% of WS2, 10-20% of Fe, 4.5-6.5% of Ti, and 2-4% of C, wherein the size of WS2 is no more than 7000 mesh, and the size of other components is no more than 400 mesh. The cladding method comprises: (1) polishing a working part of a to-be-treated journal; and (2) performing cladding treatment. The technical parameters of cladding comprise: a focus lens in a range of 300-400 mm, the diameter of a focusing spot being 2-5 mm, the scanning speed being 300-600 mm / min, the overlapping rate being 20-60%, and the thickness of a cladding layer formed from cladding being 0.4-0.8 mm. According to the method, large journal components can be processed on site, the friction coefficient of the journal after antifriction and reinforcement processing is reduced by 10-20%, and the service life is prolonged by 40-50%.

Description

technical field [0001] The invention belongs to the technical field of laser processing and material science, and in particular relates to a powder for self-lubricating laser cladding used for high-speed and heavy-duty journals and a cladding method. Background technique [0002] In the era of large industries, various high-speed and heavy-duty shafts are widely used in large-scale machinery and equipment. High-speed and heavy-duty shafts are commonly used in mechanical design. Generally speaking, they refer to linear speeds above 40m / s and working pressures above 5Mpa, such as steam turbines. , gas turbines, aero engines, marine main engines, rolling mills, mining machinery, shield machines, etc., the main shaft in the above equipment has the characteristics of large load and high speed, so most of the equipment adopts the bearing mode of oil-impregnated sliding bearings. In this way, when the supply of lubricating oil is insufficient or impurities enter the working surface...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C24/10C22C27/06C22C32/00C22C30/00B22F1/00
CPCB22F1/0003C22C27/06C22C30/00C22C32/0089C23C24/103
Inventor 芦强安志飞张丕岩芦艳君薛旭李晓琦朱艳杰
Owner 辽宁思达思克控股有限公司