22-07-2014, 02:35 PM
LASER BEAM MACHINING
LASER BEAM.pptx (Size: 119.73 KB / Downloads: 15)
INTRODUCTION:
A laser is a device which generates or amplifies light.
Laser is the term used for the phenomenon of,
L-Light
A-Amplification by
S-Stimulated
E-Emission of
R-Radiation
It is one type of non- conventional machining process through which we can perform various operation like drilling, cutting, welding etc.
WORKING:
Stimulating light source (Like xenon flash tube) emitted light in the form of a slightly divergent beam.
Then the beam is converged & focused on the work piece which has to be machined by the help of a lens.
The concentration of laser beam melts the work piece & vapourised it.
ADVANTAGES:
Any materials can be easily machined irrespective of its structure and physical and mechanical properties.
Tool wear is non-existence.
No direct contact between tool and workpiece.
It can be welding of dissimilar metals.
Small heat effected zone.
Very small holes and cuts can be made.
DISADVANTAGES:
High capital investment.
Highly skilled operators are needed.
Operation cost is also high.
Production rate is low.
APPLICATION:
Trimming of carbon resistors.
Drilling small holes in hard materials like tungsten and ceramics.
Trimming of sheet metal and plastic parts.
CONCLUSION:
Due to this laser beam machining, we can perform various type of operation like welding, drilling, cutting etc on dissimilar size of materials in very short span of time.