Distribution type laser spot alloying method

A laser alloying and alloying technology, used in laser welding equipment, metal processing equipment, metal material coating technology and other directions, can solve serious problems such as tempering and softening crack tendency, improve the distribution shape and reduce stress accumulation , the effect of increasing the depth

Inactive Publication Date: 2006-09-13
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention provides a distributed laser point-shaped alloying method, the purpose of which is to overcome the problems of temper softening and serious crack tendency caused by laser continuous lap scanning, and also solve the problem that the laser texturing technology only obtains a certain surface Morphology, but cannot carry out deep toughening treatment on the processed surface, greatly improving the service life of the workpiece

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0031] A. The workpiece is controlled by the worktable and can move two-dimensionally along two mutually perpendicular directions in the horizontal plane. The laser beam is fixed and incident on the workpiece vertically from above the horizontal plane.

[0032] B. The workpiece is a cylinder. When it is placed on the worktable, its axis is in the horizontal direction and can rotate around its axis. The laser beam is fixed and incident on the surface of the workpiece vertically. After a circle around the axis is processed, the laser beam moves along The workpiece moves a certain distance in the direction of the axis to carry out the next round of machining around the axis.

[0033] C. The workpiece is a cylinder. When placed on the worktable, its axis is in the horizontal direction and can rotate continuously around its axis. The laser beam is incident on the surface of the workpiece vertically and moves at a uniform speed along the axis of the workpiece. Under the control of th...

Embodiment 1

[0035] Embodiment 1: the present invention is used for the method for strengthening grooved roll as follows:

[0036] 1) Clean the surface of the roll with gasoline, alcohol and other organic solvents until the surface is bright and free of rust;

[0037] 2) Prepare alloy powder according to the weight ratio of Fe:C:Si:B=(40~60):(5~10):(5~10):(1~3), put the prepared alloy powder into the delivery Powder device;

[0038] 3) Put the roll on the workbench, its axis is along the horizontal direction, and it can rotate around the axis;

[0039] 4) Turn on the control system of the YAG laser and the powder feeder, adjust the direction of the laser beam so that the laser is vertically incident on the roll surface of the grooved roll, and use a pulse width τ of 0.1s and a power density of 10 7 W / cm 2 The laser processes the surface of the workpiece point by point, so that the laser action point produces a small hole effect, and the metal matrix and the powder fed in form a mixed mo...

Embodiment 2

[0042] Embodiment 2: the present invention is used for strengthening the method for nodular cast iron roll as follows:

[0043] 1) Clean the surface of the roll with gasoline, alcohol and other organic solvents until the surface is bright and free of rust;

[0044] 2) Prepare alloy powder according to the weight ratio of Fe:C:Si:B=(40~60):(5~10):(5~10):(1~3), and combine the prepared alloy powder with bonding After the agent is mixed, it is coated on the surface of the roll;

[0045] 3) After the coating is dry, place the roll on the workbench with its axis in the horizontal direction and rotate around the axis;

[0046] 4) Turn on the CO 2 The laser and its control system adjust the laser beam so that it is vertically incident on the surface of the roll, with a pulse width τ of 1.0s and a power density of 10 5 W / cm 2 The laser processes the surface of the workpiece point by point, so that the laser action point produces a small hole effect. The metal substrate and the pre...

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Abstract

The invention relates to a distributed laser point-shaped alloying method that uses the small-hole effect caused by high power density laser effect to form mixing liquid bath by metal base and high performance alloy power sent by powder sending machine, the alloying point would be formed in the following rapid concreting. Controlling the laser beam processing point to point to form alloying points on the surface of the material, the distributed laser depth enhancement would be realized. The invention optimizes the alloying points and the distributing state to improve abrasion resistance of the surface, and the useful life of the component would be improved.

Description

technical field [0001] The invention relates to a method for treating the surface of metal materials by laser, in particular to the technology of alloy strengthening of metal surface by using laser, and belongs to the field of laser processing. Background technique [0002] Laser treatment of the surface of metal materials to improve the wear resistance, corrosion resistance and fatigue resistance of the surface has been widely used in industry. For example, laser surface quenching can increase the wear resistance of gray cast iron engine cylinder liners by 3 to 7 times. Laser shock hardening can greatly improve the fatigue resistance of some parts. [0003] Conventional laser surface treatment technologies include: laser phase transformation hardening (also called laser quenching), laser melting, laser alloying, etc. They all use the laser beam as the heat source to heat the metal surface to a certain temperature (solid phase transition, or melting). When the laser beam i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10B23K26/14
Inventor 刘文今李正阳钟敏霖何金江杨林王海龙
Owner TSINGHUA UNIV
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