Experimental and numerical study of laser-assisted machining of Ti6Al4V titanium alloy

Abstract

is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. Laser-assisted machining combines several experimental parameters such as cutting speed, feed rate, depth of cut, laser power and distance between tool rake face and the laser beam axis. The optimization of these parameters is necessary to ensure the efficiency of assistance and to increase productivity. This paper focuses on the understanding of the physical phenomena during laser-assisted machining, and on optimising this process. This contribution is based on an experimental and a numerical study. The experimentalpart highlights the effects of the laser power as well as the distance between the tool rake face and the axis of the laser beam. As for the numerical part, it was performed on the ABAQUS/Explicit software. The proposed model improves the understanding of the physical phenomena of chip formation and the cutting force reduction when machining with laser assistance. In addition, this model allows a better optimization of laser and cutting parameters.Numerical findings generally corroborate experimental results and can lead to some other information difficult to catch experimentally.The main contention in the paper is that the distance between the axis of the laser beam and the tool rake face is the most important parameter that controls the reduction of the cutting force. This cutting force reduction can exceed 50%.

Numerical and experimental investigations of Ti-6Al-4V chip generation and thermo-mechanical couplings in orthogonal cutting

“…Especially, Rice and Tracey's expression became very popular in the fracture application and various researchers extended or modified the model to study the damage evolution. Johnson and Cook [28] extended this expression by considering separately the strain rate sensitivity and temperature dependency, which allowed a broad application of this model in a wide array of thermomechanical processes [5,8] . However, the work of Wierzbicki et al [29] proved that the approximation of the failure strain with a monotonically decreasing function of stress triaxiality is poor, while a strong dependency to the third stress invariant is to be preferred.…”

Development of a numerical model for the understanding of the chip formation in high-pressure water-jet assisted machining

“…The modeling of laser assistance occupies a dominant part of the research in the field of numerical simulation of machining assistance [18,29,5,10,11,9,33]. There is also almost a total lack of work concerning the modeling cryogenic and highpressure water-jet assistance.…”

Chip pattern, burr and surface roughness in laser assisted micro milling of Ti6Al4V using micro ball end mill

“…LAµMill has generally shown larger R a at t c of 0.070 mm. Heating process in LAµMill has caused the workpiece became more ductile [5,6] and produced curly chips with inconsistence size and shape. This chips has higher tendency to stick on the cutting surface by rubbing and ploughing mechanisms.…”

“…The workpiece properties are temporarily modified, allowing the milling process done under lower mechanical and thermal load. The machining process managed to be done under lower cutting force and cutting temperature [5,6], thus improve machining surface quality and tool life.…”