High-Power Fiber Laser Cutting for 50-mm-Thick Cement-Based Materials

This experimental research highlights the applicability of laser cutting to cement-based materials using multimode fiber lasers. A 9 kW multimode fiber laser is used, and the experimental variables are the water-to-cement ratio, laser speed, and material compositions such as cement paste, cement mortar and ultra high performance concrete (UHPC). The laser cutting performance on the cement-based materials is investigated in the downward laser direction. The kerf width and penetration depth of the cement-based materials are quantitatively evaluated with the parameters in the surface and cross section of the specimens after the laser cutting. Moreover, the material removal zone of each specimen is compared in terms of the penetration shapes in the cross-sectional view. Based on experimental observations, the interaction mechanism between the laser and cement-based materials is proposed

Dimensional effects on magnetic properties of Fe-Si steels due to laser and mechanical cutting

Microstructural deterioration near the cut line and presence of residual stresses both affect the magnetic properties of cut parts. In this paper, the differences between microstructural deterioration resulting from mechanical and laser cutting as well as the sample size effects observed upon hysteresis will be discussed. It will be shown that the underlying mechanism for changes in magnetic properties due to mechanical cutting is distinct from that of laser cutting

Laser Cutting of Stainless Steel Thin Sheets with Pulsed Nd:Yag Laser

The parameters of laser cutting mainly depend on material and from thickness. In case of a given material and thickness many settings can be chosen. In this article we examine the laser cutting of 0,4 mm thickness stainless steel sheets with pulsed Nd:YAG laser. We examine the effect of cutting speed on cut quality in case of three different combinations of pulse energy and pulse frequency. Good cut quality and relatively high cutting speed can be achieved with 800 Hz and 20.7 mJ setting, we can cut higher speed, but poor cut quality with 400 Hz and 49 mJ setting

Effect of CO2 laser cutting process parameters on edge quality and operating cost of AISI316L

Laser cutting is a popular manufacturing process utilized to cut various types of materials economically. The width of laser cut or kerf, quality of the cut edges and the operating cost are affected by laser power, cutting speed, assist gas pressure, nozzle diameter and focus point position as well as the work-piece material. In this paper CO2 laser cutting of stainless steel of medical grade AISI316L has been investigated. Design of experiment (DOE) was implemented by applying Box-Behnken design to develop the experiment lay-out. The aim of this work is to relate the cutting edge quality parameters namely: upper kerf, lower kerf, the ratio between them, cut section roughness and operating cost to the process parameters mentioned above. Then, an overall optimization routine was applied to find out the optimal cutting setting that would enhance the quality or minimize the operating cost. Mathematical models were developed to determine the relationship between the process parameters and the edge quality features. Also, process parameters effects on the quality features have been defined. Finally, the optimal laser cutting conditions have been found at which the highest quality or minimum cost can be achieved

PENGEMBANGAN DESAIN MOTIF BATIK KAWUNG DENGAN TEKNIK LASER CUTTING PADA CARDIGAN

Potensi teknologi laser cutting bisa menjadi suatu alternatif yang menarik untuk diaplikasikan dalam pengembangan produk fashion masa kini. Motif Batik Kawung memiliki ciri khas geometris yang cocok digunakan dalam penerapan pengembangan dengan teknik laser cutting pada cardigan. Penelitian ini bertujuan untuk mengetahui : 1) hasil jadi pengembangan desain motif Batik Kawung dengan teknik laser cutting pada cardigan, yang ditinjau dari 4 aspek meliputi; pengembangan desain motif Batik Kawung; pengembangan desain motif Batik Kawung pada cardigan; peletakan motif; dan hasil jadi laser cutting pada cardigan. 2) hasil jadi pengembangan desain motif Batik Kawung dengan teknik laser cutting pada cardigan yang paling baik. Jenis penelitian ini adalah penelitian pengembangan atau R&D (Research and Development,) dengan melakukan observasi hasil jadi, pengembangan desain motif Batik Kawung dengan teknik laser cutting pada cardigan, yang dilakukan oleh 30 observer diantaranya 5 panelis ahli yaitu dosen program studi Pendidikan Tata Busana dan 25 Mahasiswa program studi Pendidikan Tata Busana. Hasil pengolahan data tersebut dianalisis berdasarkan perhitungan rata-rata (mean) untuk mengetahui hasil desain yang paling baik. Hasil penelitian ini berupa 1) hasil jadi pengembangan desain motif Batik Kawung dengan teknik laser cutting pada cardigan yang ditinjau dari 4 aspek dengan hasil rata-rata dari aspek pengembangan desain motif Batik Kawung 3,57; aspek pengembangan desain motif Batik Kawung pada cardigan 3,80; aspek peletakan motif 3,70; dan aspek hasil jadi laser cutting pada cardigan 3,83. 2) hasil jadi pengembangan desain motif Batik Kawung dengan teknik laser cutting pada cardigan yang paling baik terdapat pada desain 8 dengan perolehan hasil mean 3,73 dimana termasuk kategori sangat baik. Kata Kunci : Pengembangan Desain, Motif Batik Kawung, Laser Cutting, Cardigan

Investigating the CO2 laser cutting parameters of MDF wood composite material

Laser cutting of medium density fibreboard (MDF) is a complicated process and the selection of the process parameters combinations is essential to get the highest quality of the cut section. This paper presents laser cutting of MDF based on design of experiments (DOE). CO2 laser was used to cut three thicknesses 4, 6 and 9 mm of MDF panels. The process factors investigated are: laser power, cutting speed, air pressure and focal point position. In this work, cutting quality was evaluated by measuring, upper kerf width, lower kerf width, ratio between the upper kerf width to the lower kerf width, cut section roughness and the operating cost. The effect of each factor on the quality measures was determined and special graphs were drawn for this purpose. The optimal cutting combinations were presented in favours of high quality process output and in favours of low cutting cost

The Effect of Selected Technological Parameters of Laser Cutting on the Cut Surface Roughness

The theoretical part of the paper presents some basics of the laser cutting technology and principles. The characteristics of the CO2 laser beam and the parameters entering the laser cutting process are described. The conventionally used material – S235JR steel, method of its laser cutting and the effect of process technological parameters on the cut area characteristics are presented as well. Experimental investigations were performed on samples made of the S235JR steel, with application of different laser cutting technological parameters, while observing the surface roughness Rz and Ra. Roughness results are displayed as images of the scanned cutting surface geometry and graphically for each sample, with comparison between the individual test samples. Effects of the position of the laser beam focus point, the cutting speed and assist gas pressure on the cut surface roughness are analyzed. It was concluded that the laser cutting parameters impose significant influence on the cut surface quality

Volba optimálních parametrů laseru při CO2 laserovém řezání pomocí Taguchi metody

Identification of laser cutting conditions that are insensitive to parameter variations and noise is of great importance. This paper demonstrates the application of Taguchi method for optimization of surface roughness in CO2 laser cutting of stainless steel. The laser cutting experiment was planned and conducted according to the Taguchi’s experimental design using the L27 orthogonal array. Four laser cutting parameters such as laser power, cutting speed, assist gas pressure, and focus position were considered in the experiment. Using the analysis of means and analysis of variance, the significant laser cutting parameters were identified, and subsequently the optimal combination of laser cutting parameter levels was determined. The results showed that the cutting speed is the most significant parameter affecting the surface roughness whereas the influence of the assist gas pressure can be neglected. It was observed, however, that interaction effects have predominant influence over the main effects on the surface roughness.Identifikace podmínek řezání laserem, které jsou citlivé na změny parametrů a hluk jsou velmi důležité. Tento článek demonstruje použití Taguchi metody pro optimalizaci drsnosti povrchu v CO2 laserové řezání nerezové oceli. Experiment řezání laserem byl naplánován a proveden v souladu s Taguchiho experimentálním návrhem pomocí ortogonálního pole L27. V experimentu byly uvažovány čtyři parametry řezání laserem jako síla laseru, rychlost řezání, tlak plynu a zaměření pozice