An analytical model of metal cutting with a laser beam

Abstract

Articles you may be interested inAn analytical model for bending angle in metal/ceramic bilayer system of laser formingThe process of cutting metals with a laser beam is described by a mathematical model comprising a set of balance equations for mass, momentum and energy. The molten film at the cutting front is defined as the control volume. The calculation yields average values for the characteristic macroscopic state of the cutting front, such as temperature, melt film velocity and melt film thickness. All relevant parameters of the laser beam and of the process gas flow are considered in the model. Numerical evaluations of the analytical model provide explanations of the process behavior both for inert and for oxygen gas cutting. The narrowing of the kerf width with increasing speed is explained by heat conduction. Furthermore, the model shows that the evaporation temperature is reached at high velocities for thin metal sheets. Using a higher gas pressure increases the diffusion limited oxidation rate and provides higher cutting velocities, while the fraction of oxidized metal decreases substantially with increasing speed.

Experimental investigation of hydrodynamics of melt layer during laser cutting of steel

“…The technique gives rather accurate estimation of , since melt layer is so thin that it is frozen very rapidly when the laser is turned off. (The thickness s m of the melt layer can be estimated in the order of 100 m from the mass balance equation s m V m = DV [21], where D is the workpiece thickness (3 mm) and V m is the velocity of continuous melt flow, which will be shown later in figure 4.) The freezing time of the melt layer was confirmed experimentally to be roughly 0.2 ms by the high speed video observation.…”

Design and Process Parameters Research of Single-Laser Stripping Platform Based on Automatic Double-Position Flipping Mechanism

“…Laser cutting can be divided into the models of gasification cutting [8], fusion cutting [9] and reaction gas assisted cutting [10]. Laser stripping includes gasification and melting at the same time.…”

Fundamentals of Laser Ablation of the Materials Used in Microfluiducs

“…Most such models start with the optics of a Gaussian beam and compute the conductive flow of heat from this source to find the temperature distribution, adding in the thermal effects which are needed to account for melting and vaporization of the substrate (Engin & Kirby, 1996;Kaplan, 1996;Olson & Swope, 1992). An idealized geometry is illustrated in Fig.…”