The basic principle of the laser perforation as follows: When a certain energy of the laser beam is
irradiated on the sheet metal surface, in addition to being reflected, the energy absorbed by the metal of
the metal melted to form a molten metal pool. And the metal surface of the molten metal relative absorption
rate increased, namely be able to absorb more energy to accelerate the melting of the metal. The appropriately
control the energy and air pressure can be removed by the molten metal inthe molten bath, and continually
deepening puddle until penetrate metal. Based on this principle of the laser perforation, in the practical
application in two ways perforations and continuous wave of the pulse wave perforation.
① pulse wave perforation principle: the peak value, the low duty cycle of the laser waves striking the
object to be processed, due to the time of laser irradiation is intermittent strictly speaking, while the average
energy of its use is relatively low, therefore the material to be processed by all of the heat absorbed is relatively
small. Meanwhile, the peak value of laser beam irradiating the molten metal residues will be in constant striking
with the joint action of the auxiliary gas is discharged under worn aperture. Such continuous gradual until the
aperture penetrating the object to be processed. With the blowing of the peak value of the laser pulse wave
hit and auxiliary gas, the workpiece after heating, melting and slag-discharge process. Perforation around the
less influence of residual heat,and the residue remaining in the perforation site is also less. Thus piercing holes
comparison rules and smaller sizes, and the impact of the start of cutting is not substantially generated.
Characteristics of the pulse wave perforation workpiece high success rate, does not impact small hole
machining of a workpiece, suitable for precision machining, In addition, as less the melting heat input to
the workpiece material, cutting workpiece stability. Inadequacies perforation relatively long time, and
have a certain influence on the processing efficiency.
② the continuous wave perforated principle: a continuous wave laser beam with a certain
energy, accompanied by the corresponding auxiliary gas, acts on the to be processed object. Melted,
to achieve rapid penetration of the purpose it a large amount of energy absorption.
liaocheng ray fine technology co., ltd