Functional Materials and Advanced Manufacturing

93 Micromachining

FIGURE 4.26 Cause and effect diagram of LBMM. LBMM, laser beam micromachining.

FIGURE 4.27 Focus of laser beam.

E

S

L

P

= (4.10)

∆t

Power density or power intensity P

d

(in W/mm

2

) is given by,

L

p

4L

p

P

d

= = (4.11)

A

s

πθ

F

)

2

(

LBMM occurs when the power intensity of the laser beam is more than the amount

of intensity lost by thermal conduction, convection, and radiation.

The drilling feed rate f (in mm/s) can be described as follows:

(CL ) (CP)

lP ld

f = =

(4.12)

(EA) E

Vs v

94 Advanced ...