Laser Surface Treatment for Low-Aggression Roughness Control
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Solution Overview
Problem
Laser processing often results in the generation of fine and sharp protrusions on surfaces, leading to issues such as scratching or loss of grip performance, while smoothing the surface can impair functionality or lubricant retention.
Innovation Solution
A surface treatment method using a laser beam with specific power density and action time parameters to remove fine and sharp protrusions while maintaining a certain roughness, defined by surface roughness parameters Ra, RSm, Pc, Sa, Spc, and Spd, to achieve a balance between aggression and grip/lubricant retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the entire conveying surface is flattened by laser processing for smoothing, then the surface aggression is reduced, but the grip performance for holding articles is impaired
Solution Approach 1:
The patent applies local quality by creating different surface characteristics in different regions. The laser processing selectively modifies the surface to remove fine sharp protrusions in certain areas while maintaining larger irregularities in other areas, achieving both low aggression and adequate grip performance through spatially varying surface properties
Solution Approach 2:
The patent utilizes parameter changes by controlling laser processing parameters (power density, scanning speed, number of passes) to achieve specific surface morphology outcomes. By adjusting these parameters, the surface is transformed to have reduced fine protrusions while preserving overall roughness characteristics necessary for grip
2Object-affected harmful factors
If the entire sliding surface is flattened by laser processing for smoothing, then the surface aggression against mating material is reduced, but the lubricant retention capability is impaired
Solution Approach 1:
The patent applies local quality by creating a surface morphology where fine sharp protrusions are removed to reduce aggression, while larger surface irregularities and valleys are maintained or enhanced to provide lubricant reservoirs. This spatial differentiation of surface features simultaneously achieves both low aggression and good lubricant retention
Solution Approach 2:
The patent creates a surface structure with porous or cavernous characteristics that can trap and retain lubricant. The laser processing generates a surface with controlled porosity and subsurface cavities that serve as lubricant reservoirs, enabling the surface to maintain both smoothness for low aggression and roughness for lubricant retention
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 method effectively removes fine and sharp protrusions, maintaining a suitable roughness that prevents scratching and ensures grip performance while retaining lubricants, resulting in a smooth uneven surface with improved functionality.
Implementation Method 1
irradiating a surface of a substrate with a laser beam to remove fine and sharp protrusions on the surface
Implementation Method 2
irradiating a surface of a substrate with a laser beam satisfying specific requirements to process the surface
Data Source
AI summary
A surface treatment method is for processing a surface of a substrate. The method includes irradiating a surface having unevenness with a laser beam satisfying all of the three following requirements: a power density in a range with a radius of 25 μm from a center of a laser beam spot is 1.0×103 to 1.0×105 kW/cm2; a power density of an entire laser beam spot is 0.08 to 0.12 times the power density in the range with the radius of 25 μm from the center of the laser beam spot; and an action time in the range with the radius of 25 μm from the center of the laser beam spot is 1.7×10-6 to 1.0×10-5 seconds. The method leaves a certain roughness on the surface of the substrate while removing fine and sharp protrusions on the surface.