Product category:
Drilling, boring and reaming
News Release from: Hoffmann Group | Subject: Garant solid carbide HPC drill
Edited by the Manufacturingtalk Editorial
Team on 11 May 2007
Drills' hydrostatic support clears chips
To clear swarf reliably during drilling, these drills have four coolant channels hat exit axially on the end face of the drill and also improves concentricity.
The new Garant solid carbide HPC drill developed by the Hoffmann Group incorporates special geometry, slightly honed main cutting edges, a point angle of 140 deg and TiAIN coating Reliable clearance of swarf is a prerequisite to the accurate high performance machining of aluminium
This article was originally published on Manufacturingtalk on 28 Sep 2006 at 8.00am (UK)
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An innovative solid carbide drill, featuring patented design dynamically effective guidance flutes that create chip clearance through hydrostatic support, solves this problem and delivers exceptional concentricity as well as reduced tool wear.
Incorporating special geometry, slightly honed main cutting edges, a point angle of 140 deg and TiAIN coating the new Garant solid carbide HPC drill was developed by the Hoffmann Group in Germany, specialists in cutting tool technology.
Four coolant channels that exit axially on the end face of the drill generate hydrostatic support at a working pressure not less than 25 bar during drilling.
This creates and maintains a lubricating film over the work piece that ensures centralised guidance for the drill, Optimum concentricity and very high stability.
Frictional resistance is also reduced.
Combined, these performance virtues give impressively close hole tolerances and good surface quality.
In a series of practical tests the drills performed well when machining AlMg3; generating short chips and clearing them reliably.
Moreover this was achieved at cutting speeds of 350-400m/min, a feed rate of 0.55mm/rev and a rotational speed of 15,000 rev/min.
Garant solid carbide drills with four guidance lands, catalogue number 12 3180, are suitable for the following.
* Drilling long-chipping aluminium and wrought alloys up to 350N/mm2 * Drilling short-chipping aluminium, aluminium casting alloys with more than 10% silicon.
* Drilling other abrasive aluminium based casting alloys.
* Drilling thermoplastics.
Normally supplied with a plain HA shank to tolerance h6, the drill is also available with Weldon HB and Whistle notch HE shanks at no extra charge.The Hoffmann Group catalogue also includes 7xD (122875) and 3xD (122308) variants.
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