Method for repairing high-speed steel cutter by means of laser cladding

A cutting tool and laser cladding technology, which is applied in the field of repairing high-speed steel cutting tools by laser cladding, can solve the problems of difficulty in thread processing, reduce the hardness of the tool body, and the large heat-affected zone of the tool, and achieve the effect of repair and remanufacturing

Inactive Publication Date: 2013-02-06
SHENYANG AEROSPACE UNIVERSITY
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Problems solved by technology

[0004] The present invention solves the problem of repairing high-speed steel cutting tools by using the high-frequency brazing method or the mechanical connection method. In view of the technical problems such as the difficulty in processing threads on high-

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  • Method for repairing high-speed steel cutter by means of laser cladding
  • Method for repairing high-speed steel cutter by means of laser cladding

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[0031] Examples:

[0032] The cutting tool is an external turning tool, whose material is high-speed steel M42, and the cladding powder is 325 mesh YG12 cemented carbide powder. The external turning tool is repaired by laser cladding in a vacuum environment. The implementation steps are as follows:

[0033] 1) Record the original data of the external turning tool, namely: rake angle γ o , Clearance angle α o , The entering angle κ r ;

[0034] 2) Correct the wear part of the tool to a regular geometric shape, polish to remove the oxide layer, and clean the area to be cladding with an acetone solution (anhydrous acetone solution, mass fraction ≥99.7%);

[0035] 3) Fix the cleaned knives, put them into the vacuum box, and vacuum, when the vacuum degree is greater than 6×10 -2 Fill with argon as a protective gas at Pa;

[0036] 4) Set the process parameters according to the cladding position (including the laser power of 2.2~2.5KW, the scanning speed of 2mm / s, the spot diameter of 1~3mm, ...

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Abstract

Disclosed is a method for repairing a high-speed steel cutter by means of laser cladding. The method is designed to solve technical problems that when an existing high-speed steel cutter is repaired in a high-frequency brazing method, a heat affected zone, which is caused by the high-frequency brazing method, of the cutter is over large, and the hardness of the cutter is reduced; and when the existing high-speed steel cutter is repaired in a mechanical connection method, threads are machined on high-speed steel difficultly, and the like. The method includes hard alloy powder covers abraded portions of a matrix of the high-speed steel cutter in a vacuum environment by means of laser cladding, so that the cutter is repaired and remanufactured. The method has the advantages that high-speed steel and hard alloy are metallurgically bonded, on the one hand, problems that oxygen exists on a cladding layer and generates air holes and accordingly the cladding quality is affected are prevented, and on the other hand, the hardness of the cladding layer is higher than that of the matrix. Accordingly, by the method, high-strength connection between the high-speed steel and the hard alloy is realized, and the damaged cutter is repaired and remanufactured.

Description

technical field [0001] The invention relates to a method for repairing a high-speed steel cutting tool, in particular to a method for repairing a high-speed steel cutting tool by laser cladding. Background technique [0002] Laser cladding technology is an emerging part surface modification technology. It is irradiated by a high-energy-density laser beam, and the surface of the substrate and the materials to be added (alloy powder, wire, sheet material) are simultaneously melted to form a thickness It is a 10-100um surface melting layer, which is rapidly solidified to meet a special performance requirement. It is a new technology that integrates multiple disciplines such as laser heating and melting, element diffusion in the molten pool, phase change and rapid solidification. . [0003] Now, there are many examples of using laser cladding to repair titanium alloy parts, but there is no precedent for using laser cladding to repair cutting tools. At present, there are two ma...

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Application Information

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IPC IPC(8): C23C24/10
Inventor 王志坚赵青贺尚晓峰
Owner SHENYANG AEROSPACE UNIVERSITY
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