Analysis of the effect of color laser marking on stainless steel
Time：May 8,2019 Hits：613
Laser marking machine can laser engraving white and black, but it is not strange, but laser colored laser marking machines of various colors may be relatively rare for friends, right? Research on the purpose of expanding the application fields of laser marking machines by equipment manufacturers and expanding the sales market of marking machines;
Laser marking machines can laser engraving white and black, but it is not surprising, but laser marking machines with various colors may be relatively rare, right?
Color laser marking on stainless steel
The research on color laser marking of stainless steel materials is mainly aimed at the development of laser marking machine application fields and the sales market of marking machines for laser equipment manufacturers. At the same time, for the stainless steel products industry, the application of color laser marking Standards can add the colorfulness of mark graphics, which can greatly increase the added value of stainless steel products and enhance the international competitiveness of domestic stainless steel products.
At present, the development of stainless steel marking in the field of stainless steel marking has developed a new process of stainless steel color marking. But at present, there is very little research work in this area. The main work of enterprises is limited to the actual operation and debugging of color marking, and rarely theoretical research and mechanism analysis. Laser marking, as a new process for color stainless steel processing, is currently in the experimental stage. Although there are a small number of practical production applications, imperfections in the process have hindered the expansion of production. In order to expand the practical application of color laser marking of stainless steel materials, it is particularly important to carry out research projects in this field.
The principle of color rendering of stainless steel, and the corresponding relationship between color change and laser energy in stainless steel laser color marking, to find out the main laser parameters that affect the color of marking, the specific research content is as follows (study the nature of color to facilitate understanding of the color development of colored stainless steel principle):
To study the principle of color development of colored stainless steel, there are three color development methods:
1
One is the generation of colored oxides;
2
The second is that a thin, colorless and transparent oxide film is formed on the surface of stainless steel under the action of chemical, electrochemical or laser. The oxide film produces interference effects, which can show color on the surface;
3
The third is a mixed state of colored oxide and oxide film.
interaction
Study the interaction between laser and materials, including the absorption of laser by metallic materials and the heating process of laser by materials. Through laser color marking experiments, observe the surface microstructure of stainless steel color laser marking samples and analyze the changes in the marking process.
Laser thermal effect
The effect of laser heat on the surface of stainless steel under the action of laser was studied. Through the calculation of the laser thermal effect equation, it is concluded that the laser energy density is directly proportional to the film thickness. Experiments show that as the laser energy increases, the color of the stainless steel surface changes in the following color sequence: orange-red-purple-blue-green-blue-blue-green-green-yellow-green-yellow-orange-red ...
It is instructive to design the special stainless steel color laser marking machine for laser equipment manufacturers. The current common laser marking machine marking parameters are: current, pulse repetition frequency, pulse width, dot pitch, line spacing, and marking speed, etc. There is no very direct correspondence between the laser-generated stainless steel color, and the marking can be performed. The parameters are changed to those that have a direct impact on the color change of the stainless steel surface, such as: laser energy, pulse repetition frequency, pulse width, etc., reducing the variable parameters, improving the simplicity and reliability of adjusting the generated color, and allowing stainless steel laser color marking to enter Mass production is possible.
Laser thermal effect
The effect of laser heat on the surface of stainless steel under the action of laser was studied. Through the calculation of the laser thermal effect equation, it is concluded that the laser energy density is directly proportional to the film thickness. Experiments show that as the laser energy increases, the color of the stainless steel surface changes in the following color sequence: orange-red-purple-blue-green-blue-blue-green-green-yellow-green-yellow-orange-red ...
It is instructive to design the special stainless steel color laser marking machine for laser equipment manufacturers. The current common laser marking machine marking parameters are: current, pulse repetition frequency, pulse width, dot pitch, line spacing, and marking speed, etc. There is no very direct correspondence between the laser-generated stainless steel color, and the marking can be performed. The parameters are changed to those that have a direct impact on the color change of the stainless steel surface, such as: laser energy, pulse repetition frequency, pulse width, etc., reducing the variable parameters, improving the simplicity and reliability of adjusting the generated color, and allowing stainless steel laser color marking to enter Mass production is possible.
