The evaluation of the surface quality after laser cutting (original) (raw)
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The Effect of Selected Technological Parameters of Laser Cutting on the Cut Surface Roughness
Tehnicki vjesnik - Technical Gazette, 2018
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.
Research on surface roughness by laser cut
2006
Laser cutting is one of the most industrial applications. Laser cutting with oxygen is used primarily for cutting of mild and low-alloyed steels. Cut surface quality is a very important characteristic of laser cutting that ensures an advantage on other contour cutting processes. This paper gives results of the experimental research referring to the determination of surface indicators obtained by laser cutting. The relationships between roughness parameters are given by linear and exponential equations.
Influence of cutting parameters on the quality of the cut surfaces of steel swith a laser beam
Advanced Technologies & Materials
The main objective of the research covered in this paper is to present results for the quality of surfaces thermally cut with a laser beam. The variety of steel materials used as samples on which laser cutting is performed are the following Č.0146 (1.0330), Č.0147 (1.0333), Č.2131 (1.5024), SS Ferbec CR, HARDOX 450 and HARDOX 550. Thermal cutting is carried out with a CNC controlled Fiber laser BAYKAL type BLS–F–1530. The quality of the cut surface is analyzed based on varying the power of the laser beam, changing cutting speed and the type of additional gas (oxygen, air and nitrogen). By visual inspection, measuring the roughness of the cut surface and measuring the width of the intersection, it is determined the influence of the factors like type of the base material, type of gases, the power of thelaser beam and the cutting speed, in accordance with the standards DIN EN ISO 9013-2002 and the JUS C.T3.022.
The Influence of Cutting Parameters on Surface Quality and Nitrogen Consumption During Laser Cutting
MM Science Journal
Unconventional machining methods, or also progressive machining methods, such as laser cutting, waterjet cutting, ultrasound machining, etc. are undergoing a very rapid development. Laser cutting machines often evaluate even 80 parameters in real time. Their advantage is the significantly higher productivity. Many values are defined by the machine manufacturer and can not be changed for a given laser. For custom laser cutting there are 2 essential parameters, adjustable depending on the process gas employed. The aim of this article is to find the setting that will reduce the consumption of process media while maintaining or improving the quality of the machined surface.
Surface roughness analysis after laser assisted machining of hard to cut materials
Journal of Physics: Conference Series, 2014
Metal matrix composites and Si 3 N 4 ceramics are very attractive materials for various industry applications due to extremely high hardness and abrasive wear resistance. However because of these features they are problematic for the conventional turning process. The machining on a classic lathe still requires special polycrystalline diamond (PCD) or cubic boron nitride (CBN) cutting inserts which are very expensive. In the paper an experimental surface roughness analysis of laser assisted machining (LAM) for two tapes of hard-to-cut materials was presented. In LAM, the surface of work piece is heated directly by a laser beam in order to facilitate, the decohesion of material. Surface analysis concentrates on the influence of laser assisted machining on the surface quality of the silicon nitride ceramic Si 3 N 4 and metal matrix composite (MMC). The effect of the laser assisted machining was compared to the conventional machining. The machining parameters influence on surface roughness parameters was also investigated. The 3D surface topographies were measured using optical surface profiler. The analysis of power spectrum density (PSD) roughness profile were analyzed.
Determining the Surface Quality Obtained After Thermal Cutting
Machines. Technologies. Materials., 2019
The measurement of deviations from planeness, rectilinearity and parallelism of plane surfaces is a set of measuring tools (instruments, devices, high performance measuring means, etc.) and the conditions under which the measurements are made (temperature mode, way of basing during the measurment, stability or non-stability of the measured quantity in the measurement process, etc.), which implies that the method of measurement is a complex concept, i.e. a set of signs and conditions that accompany the measurement process. The present work determines the surface quality obtained after air plasma cutting of 41Cr4 steel by standard methodologies for measuring its parameters. For this purpose, a methodology is used to measure the shape and configuration as well as a methodology for measuring the profile of the surface.
Dimensional analyses and surface quality of the laser cutting process for engineering plastics
The International Journal of Advanced Manufacturing Technology, 2009
In this study, the effect of the CO 2 laser cutting process parameters (gas pressure, cutting speed, and laser power) on the dimensional accuracy and measured surface roughness of engineering plastic (PTFE and POM) materials was investigated. Cutting surface profile of specimens was examined by using an optical microscope. The surface quality of specimens was examined by measuring surface roughness and form error. Analysis of variance (ANOVA) and regression analyses are employed to assess the effect of the process parameters on the dimensional accuracy.
Quality factors assessed by analytical modelling in laser cutting
Thin solid films, 2004
Although striations and dross are the most significant quality factors in laser cutting operations, the mechanics of their formation is not yet entirely clear. In this paper striation and dross formation are analysed by means of an analytical model which, by considering mass, force and energy balances, evaluates the 3D geometry of the cutting front, and the geometry and temperature fields of the melt film. On this basis, an interpretation for the striation pattern based on the evolution of the melt film is proposed, thus allowing prediction of the well-known transition from single slope at low process speeds to double slope at high speeds. In the same way, the effect of the assistant gas pressure is predicted, in accordance with experimental observations by many authors. The mechanics of dross formation is also discussed, by introducing the kinetic energy of the melt film and relating it to the local temperature.
International Journal of Engineering Research and Technology (IJERT), 2014
https://www.ijert.org/parametric-effect-of-fiber-laser-cutting-on-surface-roughness-in-5-mm-thick-mild-steel-sheet-is-2062 https://www.ijert.org/research/parametric-effect-of-fiber-laser-cutting-on-surface-roughness-in-5-mm-thick-mild-steel-sheet-is-2062-IJERTV1IS6034.pdf Mild Steel are widely used in the fabrication industry and nowadays have become of importance to other industry as well. This paper investigates experimentally the quality of laser cutting for the mild Steel IS-2062 Grade-A, with the use of a pulsed fibar laser 915,930 and 965 Watt laser cutting system. The quality of the cut has been monitored by measuring the edge roughness (Surface Roughness). This work aims at evaluating processing parameters, such as the laser power, the cutting speed and the gas pressure, for the laser cutting of mild Steel. Result revealed that good quality cuts can be produced in mild steel sheets, at a window of laser cutting speed 1450 mm/min and at a heat input of 915 watts under an assisting O 2 gas pressure of 0.8 bar.