Laser Descaling of Moving Metal Strip With Emissivity Feedback
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for removing unwanted oxide layers from stainless steel products, such as chemical and electrolytic pickling, are inefficient, environmentally hazardous, and unsuitable for industrial-scale processing of moving strips, particularly due to high acid consumption, hazardous waste management, and limited adaptability to varying oxide compositions and speeds.
Innovation Solution
A laser descaling method using a system of lasers with wavelength-specific first lasers for surface emissivity measurement, followed by pulsed second lasers for targeted descaling, and optional third lasers for additional treatment, with optical and mechanical scanning to ensure comprehensive coverage and inspection for effectiveness, allowing for versatile treatment of various steel compositions and speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If chemical pickling is used to remove oxide layers, then descaling effectiveness is improved, but environmental pollution and acid consumption increase
Solution Approach 1:
The patent replaces chemical pickling methods with laser-based descaling. The laser beam delivers energy to vaporize and remove oxide layers through ablation, substituting chemical reactions with a physical energy-based process. This eliminates acid consumption and hazardous waste generation while maintaining effective oxide removal.
Solution Approach 2:
The patent utilizes controlled variation of laser parameters (power, pulse duration, scanning speed) to optimize descaling effectiveness. By adjusting these parameters, the system adapts to different oxide compositions and thicknesses, achieving reliable descaling without chemical agents.
2Object-affected harmful factors
If traditional laser descaling is used, then environmental impact is reduced, but adaptability to varying oxide compositions and speeds is limited
Solution Approach 1:
The patent incorporates sensors that detect oxide layer characteristics (composition, thickness) in real-time and feed this information back to the control system. The control system then dynamically adjusts laser parameters to optimize descaling for the specific conditions, enhancing adaptability while maintaining environmental benefits.
Solution Approach 2:
The system transitions from static laser parameters to dynamic, real-time parameter adjustment. The laser power, pulse frequency, and scanning speed are continuously modified based on detected oxide characteristics and strip speed variations, enabling versatile adaptation to different materials and conditions.
3Reliability
If mechanical descaling by shot peening is used, then oxide removal is improved, but surface roughness increases
Solution Approach 1:
The patent replaces mechanical shot peening with laser ablation. Instead of projecting hard beads that mechanically impact and roughen the surface, the laser vaporizes oxides through controlled heating and material removal, achieving clean oxide elimination while preserving surface smoothness.
4Reliability
If chemical pickling is used for moving strips, then descaling is achieved, but processing speed and efficiency are reduced
Solution Approach 1:
The patent implements continuous laser scanning along the moving strip, maintaining uninterrupted descaling action. The laser system operates continuously as the strip passes through, eliminating the intermittent nature of chemical pickling processes and enabling high-speed processing that matches modern rolling mill velocities.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The laser descaling method effectively removes oxide layers with reduced environmental impact, improved energy efficiency, and adaptability to different steel products and speeds, minimizing the need for chemical pickling and reducing waste, while ensuring high surface quality and versatility in industrial applications.
Implementation Method 1
a laser, that is to say a light amplifier by stimulated emission of radiation, sends a ray onto the surface of the product to be descaled
Implementation Method 2
The laser radiation is projected on the surface to be cleaned and causes the oxide layer to be detached
Implementation Method 3
each sending a ray that is reflected on the oxidized surface of the product to be descaled, said rays reflected by the oxidized surface being intercepted by sensors
Data Source
AI summary
A laser descaling device and process includes a first laser sending a ray to the product to be descaled, reflected rays being intercepted by sensors that send collected information into a processing unit that calculates the absorption of the ray by the surface of the product, deduces the emissivity of the oxidized surface in the direction of the reflected rays, and correlates this emissivity with reference information prerecorded inside the processing unit; a second laser sends a ray onto the surface of the product, the spots of the rays covering the entire surface to be descaled, the second laser being controlled by a control unit receiving information provided by the processing unit making it possible to determine the operating parameters to be imposed on the second laser to obtain the descaling of the surface of the product, compared with experimental results prerecorded in the control unit.