Papers by Keyword: Laser Marking

Abstract: Polyoxymethylene (POM) is a semi-crystalline engineering thermoplastic polymer employed in the manufacturing of precision parts for engineering applications requiring high dimensional stability and good frictional resistance properties. Due to its lower cost and ease of integration into automated manufacturing processes, laser marking is the state of art method vastly employed for marking products aiming to enhance traceability and accountability. Laser marking of polymers can be challenging depending on the outcome of interactions between the material and the laser radiation for a specific wavelength. Low absorption for a wide wavelength range is usual on transparent and white thermoplastics, which is also the case for natural POM. In this work, in a bid to determine the range of feasible process parameters that ensure good-quality markings, which are necessary to developing a lean manufacturing-focused laser marking process, both natural and pigmented POM were laser-marked, and the quality of the substrates and markings were analyzed using a variety of analytical methods. Results indicated a marked difference in the laser mark-ability of natural and pigmented POM, which is attributed to marked differences in laser absorption abilities of natural and pigmented POM.

Abstract: This work shows readability of the QR code of the structural alloy Ti2 surface after the thermal influence. The main goal is the readability estimation after exposure to temperatures exceeding operating alloy temperatures and in destruction crash conditions. Contrast and readability were measured by using a Samsung smartphone and the program Adobe Photoshop CC 2017. The graphs of contrast change depending on the heating temperature were drawn. These graphs illustrate that significant changes in contrast are observed in the range from 500 to 600°C due to darkening of the base metal and the substrate, as well as fading of the dark elements of the code.

Abstract: Laser marking is a universal method of applying information to the products surface. Colored oxide films form on metal surface during a thermal exposure. The degree of steel heating influences the film thickness. Corrosion-resistant steel AISI 304 samples were laser-marked with a MiniMarker 2-20A4 precision laser complex. The contrast of the barcodes on a metal area depends on the surface roughness and the chemical composition of the steel. Fe₂O₃, Fe₃O₄ oxides forms the greatest contrast. RGB indicators are used to assess contrast. Study results may be applicable to increase the QR code contrast thereby contributing to the improvement of laser marking technology while preserving economic efficiency.

Abstract: In the application of laser marking, the biggest challenge is that machine-readable barcodes with superior quality were not marked consistently. To solve this problem, laser direct-part marking Data Matrix barcode experiments were carried out on titanium alloy substrates, using a Q-switched light-pumped Nd:YAG laser. The microstructure of the symbols was analyzed using an environmental scanning electron microscope (ESEM). The internal micro-stresses of the marked areas were analyzed using X-ray diffractometer (XRD). The influence of the pulse frequency on the symbol contrast is analyzed. Results showed the interaction between the laser and the titanium alloy can be found. This can further explain the physical mechanism of laser direct part marking Data Matrix symbols on titanium alloy substrates.

Abstract: The influences of laser processing parameters on the symbol contrast and surface roughness of Data Matrix barcodes were studied by single factor experiments using a Q-switched lamp pumped Nd:YAG laser. The orthogonal experiments were carried out to further study the relationship between laser parameters and surface roughness. Multivariate nonlinear regression analyses were performed based on the orthogonal experimental results and a mathematical relationship between parameters and surface roughness was established. The results show that the change trend of surface roughness is similar to symbol contrast with the increase of laser parameters. Both the average power and two different overlaps are important factors affecting the surface roughness and symbol contrast. But the current intensity has an insignificant impact on the surface roughness. The developed regression model can be used to predict the roughness of Data Matrix barcodes. This study can improve industrial application of laser direct part marking technology on titanium alloy substrates.

Abstract: In order to improve the corrosion resistance of Data Matrix (DM) code laser marked on aluminum alloy, the salt spray corrosion resistance was determined. First, the corrosion resistance of DM code laser marked by 3 different processing modes was investigated. Meanwhile, the SEM images and EDS data for modules and substrate of DM code are analyzed, which explains the differences of corrosion resistance for DM code by the 3 processing modes. A kind of laser combined electrochemical marking method for anti-corrosion DM Code mark was put forward, where a bare mark of DM code was created by direct laser marking in advance, and then a uniform, compact and protective oxide film was deposited on the bare mark by electrochemical oxidation to form the corrosion resistant mark. The results show that the corrosion resistance of laser direct marking DM code for different processing modes exist some difference. However, all the DM code samples become failure after at most 15.5 hours salt spray corrosion. The DM Code mark by the proposed method can withstand approximately 42 hours of salt spray corrosion, whose corrosion resistance improved 2-3 times.

Abstract: The article is devoted to some aspects of laser marking technology for machine parts. We consider the local impact zone effect of the pulse laser beam on the surface of metal materials. The results describing the influence of process parameters on the quality of the being marked images by pulsed laser are submitted. The examples of using barcode marking on several materials for machine parts in selected technological modes of installation are given.

Abstract: This article provides a whole solution to the battery manufacturing execution system (MES) which realizes the complete control of data in battery manufacturing ． MES can improve the manufacturing efficiency. Along with many other functions like quality trace, production planning, quality management, production status monitoring, production tracking, profit forecast predicting profit, recording of exceptional production, raw material management, equipment management, report printing etc ．To remain competitive, manufacturers need MES solutions that meet their industry-specific needs. All the functions turn the battery manufacturing execution system into a production, management, decision-making supporting system which combines work flow, data flow and control flow．

Abstract: Laser marking has become one of the most important identification methods. Compared with the dots scanning marking method, vector scanning marking has a faster marking speed due to its less strokes and smooth trajectory. Based on the principle of the laser galvanometer scanning, an information processing method obtaining the vectors information, pre-marking until control the lasers trajectory is putting forward herein. Experiments proved that this information process method could be applied to character, barcode and any other graphs which could be described by vector information.

Abstract: The existing laser marking control systems are mainly based on PC and PCI laser drivers. PC is used for editing marking information and extracting marking data. The rapid processing capacity of PC makes the laser making machine achieve faster processing speed. However, it cannot be used in the outdoors and bad situations. In older to make the laser marking system widely adapt to various environments, an embedded laser marking controller is developed. It is based on ARM9 and LINUX. It can be easily operated and can achieve wonderful marking.