Product category:
Drilling, boring and reaming
News Release from: Mapal | Subject: Tap drills
Edited by the Manufacturingtalk Editorial
Team on 15 October 2007
Tap drills cut high Si aluminium
Tap drills have PCD blanks over the whole tapping length to increase tool life when machining high silicon content aluminium, for example as used in automotive crank cases.
The HP PCD TapDrill from Mapal has PCD blanks used over the whole tapping length The idea is to increase tool life when tapping high silicon aluminium alloys, when compared with solid carbide tap drills
This article was originally published on Manufacturingtalk on 22 Apr 2004 at 8.00am (UK)
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Longer life is offered even when compared with diamond coated types, said Mapal.
The company said too that its high precision in manufacturing the tap drills ensures high production reliability.
* Batch production - in machining cylinder crank cases in AlSi17 aluminium alloy, a user reported tool life extended 22 times when compared with a solid carbide tap drill's performance.
Previously a solid carbide tap drill was used for this operation, which had to be replaced after 15,000 threads.
An HP-TapDrill is now being used with a spindle speed of 875 rev/min and a feed rate of 1250mm/min.
To date more than 350,000 threads have been cut with one Mapal PCD tap drill without any sign of wear.
It represented a 22x increase in tool life, said Mapal At another user's works the HP-TapDrill is also used for machining M8 and M10 threads in cylinder crank cases in AlSi17.
The conventional tap drill previously used only lasted for just 20 parts.
On the other hand, the HP-TapDrill is has machined more than 300 parts producing 11,000 threads.
The tool has shown no sign of wear.
The surfaces of the thread flanks and the dimensional stability within the bore are excellent.
In fact the end of the tool life is still not in sight.
In addition to the extended tool life mentioned above, the HP-TapDrill has also achieved a clear reduction in machining time of some 60%, said Mapal.
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