Machinery's Handbook, 31st Edition
Microcutting Tools
1165
Microtool
Laser displacement sensor
z
h 2 h 1 0
Part
Fixture
x
Vice
Fig. 9. Indirect Vertical Tool Offset Detection Technique. Microtool Damages
2
10.0 μ m 1
3
50.0 μ m Fig. 10b. Built-up-edge at a cutting lip (label “2”) and side (label “3”) of a microdrill.
Fig. 10a. Abrasion with progressive wear from center to edge (label “1”) due to different cutting speed on a microdrill.
10.0 μ m
10.0 μ m
4
6
5
Fig. 10d. Chipping at the cutting edge of a carbide micromill due to local depletion of cobalt binder.
Fig. 10c. Adhesion wear (label “4”) due to built-up-edge on a micromill (label “5”).
Thermal effect is the second cause of tool damage. A cutting tool edge is softened at high machining temperature, deformed plastically, and removed from the tool. Both high-speed steel tools and carbide tools with high cobalt content are vulnerable to thermal damage. High temperature also promotes diffusion, i.e., atoms from the tool and workpiece move
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