Mumbai University > Mechanical Engineering > Sem 5 > Production process 3

Marks: 10 M

Year: Dec 2014

Laser beam machining (LBM):

Principle of Laser beam machining (LBM):

• Conversion of electrical energy into heat energy to emit laser beam
• Laser beam is focused over a particular area on workpiece which creates high intensified concentration on work piece because of which the work piece melts, thus giving the required shape.

Working of Laser beam machining (LBM):

• The diagram of LBM is shown in figure.
• Laser is stand for Light Amplification by Simulated Emulsion of Radiation.

Laser Beam Machine

• The work piece is placed on the aluminum work table which material is hard not cut by laser beam.
• Ruby rod is used into form of cylindrical crystal both ends of ruby rod are finished to optical tolerance.
• The flash lamp wound around the ruby rod and connected to power supply.
• The ruby rod becomes high efficient on low temperature and low efficient on high temperature. It is thus continuous cooled with water, air or liquid nitrogen.
• When the light beam has been amplified sufficiently and intensity beam of light comes out form partially reflected end it is focused on the work piece at the focused very high temperature which vaporized and removes the metal on work piece.

Advantages of Laser beam machining (LBM):

• There is no tool wear.
• Extremely small and complex holes are drills.
• No contact between tool and work piece.

Disadvantages of Laser beam machining (LBM):

• Investment cost is more.
• Skilled operator is required.
• Operating cost is more.
• Flash lamp life is too short.

Applications of Laser beam machining (LBM):

• It is used for welding of thin metal sheet.
• Leaser can be used for cutting as well as drilling, Heat treatment, cutting complex profile.