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Laser derusting method and laser derusting device

A laser rust removal and laser technology, which is applied in laser welding equipment, chemical instruments and methods, cleaning methods and utensils, etc., can solve the problems of long process time, low rust removal efficiency, and low efficiency, and achieve the effect of precise rust removal

Active Publication Date: 2022-06-24
CHINA CONSTR FOURTH ENG DIV INSTALLATION ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the traditional rust removal method utilizes impact rust removal, the rust removal efficiency is low, and the process takes a long time. low problem

Method used

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  • Laser derusting method and laser derusting device
  • Laser derusting method and laser derusting device
  • Laser derusting method and laser derusting device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] A laser rust removal method, comprising the following steps:

[0082] The first step is to determine the first area to be derusted by visual laser, and predict the second area to be derusted;

[0083] The second step is to correspond the rust removal laser to the first area to be removed, and perform the rust removal operation on the first area to be removed by the rust removal laser;

[0084] Step 3: According to the predicted position of the second rust-removing area, make the second rust-removing area correspond to the visual laser and rust-removing laser, perform rust removal operation on the second rust-removing area, and predict the first rust removal area. Three areas to be derusted;

[0085] Step 4: According to the predicted position of the nth rust-removing area, make the nth rust-removing area correspond to the visual laser and the rust-removing laser, perform the rust-removing operation on the nth rust-removing area, and predict the nth rust-removing area. ...

Embodiment 2

[0091] This embodiment is a specific optimization of the first embodiment.

[0092] The method of the first step includes the following steps:

[0093] A1. Project the laser stripe onto the surface to be derusted, convert the laser stripe image within the visual range into a grayscale image, and count the sum of the grayscale values ​​along the longitudinal axis of the laser stripe image;

[0094] A2. Determine the extreme point of the sum of gray values, and obtain the abscissa and ordinate of the laser fringe image at the corresponding position, and use the abscissa and ordinate as the center point to determine the first region of interest [region of interest, ROI], and set the first region of interest as the first region to be derusted;

[0095] A3. Mark multiple feature points in the first region of interest. The marking method is as follows: the gray value of the feature points is greater than the background threshold; the rusted points are generally diffused, that is, t...

Embodiment 3

[0114] This embodiment refines the rust removal method for the rust removal laser in the third step.

[0115] In conventional laser rust removal, long-term high-intensity irradiation may cause energy waste or damage to the substrate. The rust-removing method of the rust-removing laser in the present embodiment includes:

[0116] B1. Establish a one-dimensional linear heat conduction-energy conservation equation: where T is the temperature, j is the thermal conductivity, ρ is the material density, c is the material heat capacity, and Q is the external heat source of the laser;

[0117] B2. Establish a laser rust removal equation:

[0118] Wherein, h is the thickness of the rust layer, s is the rust removal time, A is the reflection coefficient of the steel to be removed to the laser, I 0 is the energy density of the laser, β is the absorption coefficient of the laser energy by the steel to be derusted, θ(h, s) is the initial temperature change value, and τ is the laser pu...

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Abstract

The invention discloses a laser derusting method and device, and the method comprises the steps: determining a first to-be-derusted region through visual laser, and predicting a second to-be-derusted region; the derusting laser corresponds to the first to-be-derusted area, and derusting operation is conducted on the first to-be-derusted area through the derusting laser; according to the predicted position of the second to-be-derusted area, the second to-be-derusted area corresponds to the visual laser and the derusting laser, derusting operation is conducted on the second to-be-derusted area, and a third to-be-derusted area is predicted; and the steps are repeated until rust removal is completed. According to the method, the rusted areas on the to-be-derusted steel are positioned through the visual laser, the first to-be-derusted area in the rusted areas is derusted through the derusting laser, and the second to-be-derusted area is predicted according to the trend of the feature points of the rusted areas, so that accurate derusting is achieved, and the situation that comprehensive derusting is needed is avoided.

Description

technical field [0001] The invention relates to the technical field of rust removal, in particular to a laser rust removal method and a laser rust removal device. Background technique [0002] Combined with the current production situation of steel structure, the workshop mainly relies on semi-automatic shot blasting machine for rust removal of steel pipes in steel structures. Turn on the shot peening machine, and the transmission mechanism of the shot peening machine slowly pushes the steel pipe forward, and uses the principle of small steel balls to hit and peel off the rust to remove rust. [0003] This method is inefficient, the process takes a long time, and there are certain security risks. [0004] At the same time, the rusted surface of some steels is not fully rusted, and it may be rusted only in some areas. If comprehensive rust removal is used, the rust removal time will be too long, resulting in low rust removal efficiency. SUMMARY OF THE INVENTION [0005] T...

Claims

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Application Information

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IPC IPC(8): B23K26/362B23K26/0622B23K26/70G06T7/73G06T7/11G06T7/136G06T7/194G06T7/246G06V10/25
CPCB23K26/362B23K26/0622B23K26/70G06T7/73G06T7/11G06T7/136G06T7/194G06T7/246B08B7/0042G06T2207/30241
Inventor 屠言辉李沪王勇锋吴家雄王义俊刘民友刘强谢海林
Owner CHINA CONSTR FOURTH ENG DIV INSTALLATION ENG
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