Ceramic Package Array

OBJECTIVE

Develop a process to dice ceramic package arrays.

Blade breakage is a common problem with current process. Currently using the following parameters:

Blade: Disco resin-bond, 58 x .250 x 40mm

Exposure: .150”

Speed: 30,000 rpm

Feedrate: 0.2 IPS (12 IPM)

SPECIFICATIONS

Part Size: .238 x .265 +/-.005”

OUTLINE

A metal bond blade was chosen to maximize stiffness. A blade thickness of .007” was tested, although a full .010” thickness would have been optimal:

Feedrates up to 12 IPM were evaluated, but 5 IPM proved to be the maximum capability of this blade.

Table 1 Test Parameters

Machine	RIGID MTI 612
Wheel	Metal Bond (call Aquabond for details)
Size	4.5 x .0069 x 2.75”
Spindle Speed	9000 RPM
Feedrate	5.0 IPM
Wheel Exposure	.150”
Material	Ceramic package array, 3 x 3 x .128”
Material Orientation	Populated (green cover) side up
Depth of Cut	.135”
Cut Direction	Climb Cut
Fixture	Steel block / 8” dia. porous ceramic vacuum chuck
Bonding	Aquabond 65
Substrate	Glass
Initial Dressing Cycle	NMVC600-J8VCA, ½ x ½ x 6” (20) 1/2” lg. passes @ 2500 RPM / 4 IPM .130” D.O.C
In-process Dressing	NMVC600-J8VCA, ½ x ½ x 6” 1/2” per pass @ 9000 RPM / 5 IPM .050” D.O.C.
Coolant	19°C Syntilo/DI water, 2.5% conc. @ 2.0 GPM thru single .25” dia. nozzle

RESULTS

Table 2 Test Results

CONCLUSIONS

Part size was well within specification, as shown in Table 2.

Feedrates may be increased if the blade thickness is maximized to .010”.

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