ARNO - каталог сверление 2011
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Application reference
SHARK-Drill®
Recommendations for SHARK-Drill® (extra) short to standard holder.
Always select shortest possible drill
Important: carbide inserts only suitable up to approx. „6-7 x D“.
In order to obtain a problem free machining with the short (to medium) drills, the following has proven successful:
1) Check and possibly adjust coolant pressure (73)
2) Immediately after the first cut we suggest a chip breaking and cutting data review. The target should be short and easily removable
swarf.
3) Measure the hole and check that tolerance is acceptable.
4) During the machining always ensure that the swarf is short and removed from the hole. Otherwise a pecking cycle may be required.
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Swarf control
The following recommendations have also proved advantageous:
• Monitor swarf control
• If not yet at maximum feed rate potential, an increase in feed rate can lead to better chip breaking.
• If none of these changes are successful it may be necessary to insert a pecking cycle.
For many materials in the stainless steel area, but also others, it may not always be possible to achieve acceptable chip breaking simply by
adjusting vc and f. In such cases a pecking cycle will be needed. This should only be a small peck cycle of approx 0.1 mm.
A pecking cycle where the tool is removed out of the hole is not recommended.
As a rule take increments of approx 10% of the drill diameter (e.g. 20 mm diameter = 2 mm peck depth).
Recommendations for the extended and long SHARK-Drill®
Always select the shortest possible drill
Attention: Carbide inserts are not recommended.
In order to obtain a problem free machining with the extended and long drills, the following has proven successful:
1) Pilot drilling (approx. 1 x D) with same diameter. The drill point should be same or larger than SHARK-Drill® insert.
Other start options:
Centering with 132 degree drill point (up to 65 mm)
Centering with 144 degree drill point (from 65 – 114 mm)
Careful penetration (approx 50% of recommended feed rate) until full diameter is achieved.
2) Chip breaking and cutting data optimizing before starting. Target is short and easy to evacuate swarf.
Modify cutting data as below:
VC [m/min]
f [mm/U]
Extended
0,9
-
Long
0,85
0,90
3) Check the coolant pressure and flow rate. The coolant pressure (see page 73) can be adjusted using the following formula:
SHARK-Drill® - Extended
x 1,3
- Long
x 1,5
4) Measure the hole and check that tolerance is acceptable.
5) Increase cutting data to previously established data and finish drilling, making sure that the swarf remains short and leaving the hole pro-
blem free. Otherwise a peck cycle may be required.
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Размеры указаны в мм
Dimensions in mm
Toutes les dimensions en mm
info@arno-tools.ru
www.arno-tools.ru
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