At present, it has been using a number of marking machines in all industry. The main use
of these marking machines is for the process of identification marking on various products. Many
industries are manufacturing different kind of products that they need to mark their brand name or
identification symbol on its surfaces. A marking tool or marking machine can be used to print on the
surfaces of all metals like paper, clothe, wood, plastic, ceramics, rubber, steel, gold, iron, etc. The most
powerful marking machines used now a day are working on the basis of laser marking technology. That
means these machines uses highly penetrating laser beams to generate marks on the surfaces. Laser
beams are highly accurate enough to create precise marking on all metal surfaces. This is why laser
marking has gained high po[censored] rity in all manufacturing industries. Laser marking machines are the
conventional and ideal marking machines ever used for the identification marking process. The laser
machines for marking purposes are produced form the leading manufacturer of diode lasers the laser
line, Germany.
Laser marking is the use of laser to mark on a material. Engraving on materials with the use of laser
beams is termed as laser marking. The machine used for laser marking is called laser engraving machine.
It has 3 parts, the laser, the controller and the surface. Laser is the beam which allows the controller
to trace designs onto the surface. The controller controls the direction, intensity , speed and the width
of the laser beams which is aimed on an object. There are three different types of laser machines. The
most preferred is the X-Y table where is laser beam moves around the stationary object in X and Y axis
drawing vectors. In some scenario, the beam is stationary and the object moves. The work surface
moves in Y axis and the laser in X axis. the second type of laser machine is for cylindrical objects in
which the beam successfully engrave a fine helix and the desired image is formed in the end. In the third
method, both the beam and surface are stationary and galva mirrors make the beam over the surface.
The beam from the laser optical system and the point of the object should me at the focal plane
and should also match with the focal point. This point is basically small and could be less than a fraction
of a millimeter. The laser beams are significantly affected on the areas that come under the focal point.
The energy produced by the beam affects the surface of the material under the focal point. The surface
of the material could result in fracture or in some cases flake off when the material is heated and
vaporized by laser beams. Through this process the material from the surface is removed to show an
engraving.
Vacuum pumps are needed when the material is vaporized and emit toxic fumes when laser
beams are emitted onto it. Variety of materials could be engraved through lasers. Woods are one of the
examples for natural materials. Hard woods and the soft woods are the two types of wood materials.
Hard woods include walnut, oak, mahogany and maple. Soft woods include hard paper , fiberboard ,
news prints etc . The other materials for laser writing include plastic like acrylic plastic, metals, stone, glass, jewellery,
plastics etc.
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