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Gun drills
Coolant values
The tasks of the coolant (KSS): • cooling the cutting edge Coolant pressure p in bar
• chip evacuation during the cutting process, tem- neat oil
peratures of approx. 800° C are
insufficient coolant leads to chip created at the carbide cutting soluble oil
congestion and results in tool edge, insufficient cooling drasti-
breakages cally reduces tool life. Pressure curves in graph:
• lubricating film The thicker line above indicates
especially with single-fluted deep drilling oil, the bottom line
gun drills high surface pressure soluble oil.
is created between hole and Coolant volume flow Q in l/min
supporting strips. A break in the
lubricating film causes exces-
sive friction leading to tool
breakages.
EB100 175 42
150 36
125 30
100 24
75 18
50 12
25 6
1 23 4 5 1 234 5
tool diameter in mm tool diameter in mm
EB80 105 105
90 90
75 75
60 60
45 45
30 30
15 15
10 20 30 40 50 10 20 30 40 50
tool diameter in mm tool diameter in mm
EB800 105 105
90 90
75 75
60 60
45 45
30 30
15 15
10 20 30 40 50 10 20 30 40 50
tool diameter in mm tool diameter in mm
ZB80 105 105
90 90
75 75
60 60
45 45
30 30
15 15
10 20 30 40 50 10 20 30 40 50
tool diameter in mm tool diameter in mm
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www.guhring-tools.ru
