Abstract
Today, methods for marking parts and components in industrial production are constantly improving, and they must meet several basic criteria for active traceability by consumers. The parameter that is of paramount importance for the quality of the marking is related to the contrast of the marked sign or QR code. To achieve optimal contrast, a number of technological factors and the functional relationships between them must be taken into account.The report examines the role of the number of repetitions on contrast in raster marking of HS6-5-2-5 tool steel products. The dependences of the number of repetitions on the speed and frequency are also taken into account - the main factors in the process of laser ablation. Graphs of the depth of the marking are drawn depending on the number of repetitions and the linear density of the pulses. The experiments were made with a fiber laser. By the performed analyses the working intervals of processing between the studied factors are deduced, allowing to achieve the desired optimal result.
Highlights
Laser marking of metals and alloys is a technological process that is widely used in production
The technological process of laser marking has been studied in the work of some authors [1 – 8]: The paper [1] presents a study of laser micro processing of metals by using a high repetition rate femtosecond laser
The requirements for the speed in the technological process of laser marking are contradictory: on the one hand, the speed must be high in order to reduce the time for performing the operation, and to obtain greater efficiency in the production of the product; on the other hand, it must be relatively small in order to be able to absorb the required amount of energy under the influence in order to reach the required temperature and contrast of the marking
Summary
Laser marking of metals and alloys is a technological process that is widely used in production. The report [3] presents the results of the measurements and analysis of the influence of laser process parameters on the color contrasting obtained In this case, the relevant parameter, the field of high frequencies and low pulse energy were examined. The study was conducted for titanium (Grade 2) using a commercially available industrial pulsed fiber laser It was determined how a variety of different laser process parameters, such as laser power, the scanning speed of the material, the temperature of the material, the size of the marked area, and the position of the sample, relative to both the focal plane and the centre of the working field of the system, affect the repeatability of the colours created. The aim of the development is to study the influence of the overlap coefficient when marking HS6-5-2-5 tool steel products with a fiber laser for different values of speed and linear density of the pulses
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