Laser Marking Metal Surfaces with Controlled Oxidation
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Solution Overview
Problem
Existing methods for marking or coloring metal surfaces, such as paints and electrolytic coloring, are limited in flexibility and durability, and often use harmful solvents, while laser marking techniques are primarily used in laboratory settings for simple markings.
Innovation Solution
A system comprising a laser marking unit, gas and temperature control units, and a coating unit, controlled by a processor and memory to create complex patterns and coatings on metal surfaces, allowing for durable, multicolor markings on various metal surfaces with different properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional marking methods (paints, adhesive labels, etching, electrolytic colouring) are used, then the marking process is simple to implement, but the markings are not durable and the methods lack flexibility
Solution Approach 1:
The marking process is divided into multiple sequential steps: laser ablation to create pattern, followed by selective oxidation in controlled atmosphere, and optional coating application. Each step contributes to the final durable marking, allowing complex functionality to be achieved through simple, sequential operations
Solution Approach 2:
The system controls marking durability by adjusting laser parameters (power, pulse duration, scanning speed) and oxidation parameters (gas composition, temperature, exposure time). These parameter changes enable the same apparatus to produce markings with different durability levels and surface properties
2Adaptability or versatility
If traditional colouring methods are used, then the process is simple, but the markings lack multicolor capability and environmental friendliness
Solution Approach 1:
The system replaces chemical colouring methods (paints, dyes, solvents) with a physical laser-based process. The laser induces localized oxidation and phase changes in the metal surface to create different colors, eliminating the need for harmful chemical substances while enabling multicolor markings
Solution Approach 2:
The laser marking process utilizes phase transitions of metal oxides (from metallic to oxidized states) to generate different colors. By controlling oxidation degree and heating cycles, the system produces various colors through purely physical transformations without chemical coatings
3Manufacturing precision
If laser marking is used in laboratory settings, then simple markings can be achieved, but complex patterns and multicolor images cannot be produced
Solution Approach 1:
The laser marking apparatus is designed to perform multiple functions: ablation, oxidation, heating, and coating application, all controlled by a single integrated system. This universal device can produce both simple and complex markings, as well as multicolor images, without requiring separate equipment for each function
Solution Approach 2:
The control system incorporates feedback mechanisms to monitor and adjust laser parameters, oxidation conditions, and coating application in real-time. This enables precise reproduction of complex patterns and accurate color control, maintaining high manufacturing precision even for sophisticated multicolor images
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 system enables durable, multicolor graphical images on metal surfaces, maintaining surface quality and properties, and can mark objects of complex geometries, offering a more environmentally friendly and flexible solution compared to traditional methods.
Implementation Method 1
a laser marking unit capable of forming a laser beam onto the metal surface
Implementation Method 2
Marking small steel surfaces with a laser beam has been known for a few years in laboratory environments
Implementation Method 3
gas unit for controlling the atmosphere of the space under the cover
Implementation Method 4
temperature control unit for controlling the temperature of the space under the cover
Implementation Method 5
coating unit for producing a coating on the metal surface
Data Source
AI summary
A controlling apparatus, comprising:at least one processor; andat least one memory including computer program code,wherein the at least one memory and the computer program code are configured to, with the at least one processor, cause the apparatus at least to:obtain a file comprising an image to be marked on a surface;analyze the image to be marked on the surface and determine one or more continuous areas of the image having the same fill color and on colors in the image;obtain information on the quality and thickness of the surface of the object to be marked;determine order in which the areas of the image with different colors are to be marked;determine on the basis of the determined and obtained information parameters for a laser marking apparatus separately for each area of the image with different colors; andstore determined parameters in a marking file.