Page 441 - Hartner

Cooling Agents

An efficient cooling agent is of extreme importance. Insufficient coolant pressure and volume can result in an unsatisfactory
surface finish or tool breakage.
If possible, the size of solid particles in the coolant should not exceed 50 µm.

For the application of Multiplex tools with high speed steel or carbide inserts we recommend soluble oil as coolant applying the
standard ratio of mixture of 1 : 20.
The coolant pressure and volume are more important than the composition of the soluble oil. An efficient cooling agent is
therefore an important pre-requisite for sufficient cooling and lubrication.
16 80
14
l/min
12 60
10
16 80
8 40
14
6 bar l/min
12 60
4 20
10
2
8 40
6 10 bar 20 30 40 50 60 70 80 90 100 210
4 20
2

10 20 30 40 50 60 70 80 90 100 210

Machine and Workpiece

Only a rigid machine, spindle, workpiece and tool clamping make the application of carbide possible. Insufficient rigidity leads
to vibrations or rapid corner wear of the drill during the production of through holes when the chisel edge exits the workpiece,
resulting in reduced tool life or insert breakage.

48
44
40
36
32
28
48
24
44
20
40
16
36
12
32
8
28
4
24
20 20 40 60 80 100 120140 160180 200 210
16
12
8
4
20 40 60 80 100 120140 160180 200 210

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