The laser cleaning machine uses the interaction between high-energy laser beam and material surface, and utilizes thermal effect, photochemical effect or shock wave effect to make pollutants (such as rust, oil, coating, etc.) evaporate, peel off or decompose instantly, so as to achieve non-contact precision cleaning.
Detailed working principle
Laser beam focusing and energy deposition
The laser cleaning machine focuses the laser beam to a micron-level spot through an optical system to form a high energy density area. After the pollutant or substrate absorbs the laser energy, the temperature rises sharply and reaches a vaporization or sublimation state.
Selective absorption: If the absorption rate of the pollutant to the laser is higher than that of the substrate (such as rust and metal), selective cleaning can be achieved to avoid damaging the substrate.
Physical and chemical action mechanism
Thermal effect dominates: The pollutant melts, vaporizes or evaporates after being heated (such as metal oxides).
High temperature may also cause plasma expansion and generate shock waves to assist in the stripping of pollutants.
Photochemical effect (ultraviolet laser):
Short-wavelength laser (such as 248nm ultraviolet light) directly destroys the molecular bonds of organic matter (C-C, C-H, etc.), causing them to crack and gasify, which is suitable for cleaning resin or oil stains.
Dynamic process and auxiliary technology
Shock wave stripping: Laser-induced plasma expansion generates shock waves, which mechanically "push away" pollutant fragments.
Cooling protection: Some equipment is equipped with a water cooling system to prevent thermal damage to the substrate.
Technical advantages
Environmental protection: No chemical solvents are required, reducing pollution.
High precision: The spot size (micrometer level) and scanning path can be controlled, suitable for complex surfaces.
Non-contact: Avoid mechanical wear or chemical corrosion.
Typical application scenarios
Metal processing: Rust removal, descaling (such as automotive parts).
Cultural relics protection: Accurately remove surface stains without damaging the cultural relics themselves.
Aerospace: Cleaning high-precision parts such as aircraft engine blades. Core Summary: The essence of laser cleaning is to achieve efficient and non-destructive cleaning effects through selective energy deposition combined with thermal, photochemical and mechanical effects.