14-07-2012, 11:13 AM
Laser Applications in Manufacturing
Laser Applications.ppt (Size: 1.67 MB / Downloads: 43)
Laser Technology
Thermal nontraditional machining process
High energy laser beam melts and vaporizes material
Beam*:
Continuous
Pulse
Examples of lasing materials*:
Co2
YAG
Important physical parameters of workpiece materials*:
Reflectivity
Thermal conductivity
Specific heat
Latent heat
Features of laser beam:
High power
Monochromatic*
Coherent*
Non-contact
Processes: Cutting
Cutting starts by drilling a hole then moving the beam in a programmed path.
A stream of assist gas* is used to:
blow the molten metal
Cool workpiece
Minimize heat affected zone
Advantages:
Narrow kerf* and heat affected zone
No post-cut finishing is required*
Economic alternative for materials that are difficult to cut by conventional methods*
Narrow slots
Closely spaced patterns
Does not require smooth surface
Processes: Drilling
Advantages:
Burr free holes
Eliminates drill breakage and wear
Drills in difficult to access areas, curved surfaces and parts incased in glass
Drills holes of almost any shape
High quality and precision holes
Close tolerances
Limitations:
Holes up to 1” deep in plastics and ferrous metals, and 0.125” in reflective materials.