Product category:
Drilling, boring and reaming
News Release from: Mapal | Subject: Adjustable head carbide drill system
Edited by the Manufacturingtalk Editorial
Team on 09 November 2005
Adjustable head drill optimises torque
delivery
Drills with replaceable head achieve the machining times of solid carbide drills and can also adopt their specific blade geometry for making larger diameter holes more economically.
In bore machining for diameters up to around 15mm the solid carbide drill is the measure of all things, just as before Within the Mapal Group the drill specialist company Miller offers an innovative and comprehensive programme for this
This article was originally published on Manufacturingtalk on 22 Apr 2004 at 8.00am (UK)
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The larger the drill diameter, however, the more the dramatic the price rise for carbide as a raw material comes into play; for example APT - the most important basic material for the production of carbide - has gone up in price by over 250% compared to last year.
For the drill manufacturer the aim of every new development must therefore be to reduce the amount of carbide in the drill to a minimum.
The use of replaceable blades or inserts which is widespread in the market is an alternative which reduces the use of carbide in the drill sector.
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Hard machining is performed in continuously variable transmission components using single and multiple bladed reamers with replaceable heads are used with PCBN cutting edges.
Because the design usually involves a single cutting edge, however, the insert drills have disadvantages in machining time and in particular in the quality of the bore.
This means that they cannot be used for difficult precision bores and bores which have a large length to diameter ratio.
A significantly more economic alternative is the drill with replaceable head, which achieves the machining times of the solid carbide drill and can also adopt the specific blade geometry of a solid carbide drill.
With the new replaceable head drill Mapal provides a new precision drill which has the following properties: * Stable connection and high torque transmission - as a connection, the gear teeth developed by Mapal, which run radially, guarantee absolutely precise alignment and a high torque transmission within the system.
This means that changeover and concentricity accuracies of less than 10 micron can be reliably achieved.
* Simple, precision handling:- the efficiency of replaceable head drills is increased many times if drill heads can be replaced without the holder having to be removed from the machine.
For this Mapal uses radial clamping which has already been successfully used in other areas.
To change the drill head, the eccentric pin on the drill shank is actuated.
This allows the gear teeth to be released and the drill head can then be unscrewed.
* Optimum coolant supply despite integral connection - with Mapal replaceable head drills, the coolant is supplied through internal channels in the drill and passed directly onto the front of the head.
This ensures that the coolant is applied exactly where it is needed - on the cutting edge.
* High precision drill geometry for machining steel and cast iron - the new Mapal twin-bladed replaceable head drill for machining steel and cast iron is designed with the high precision drill geometry of the Mega Quadro Drill.
In addition to the two usual guide chamfers on the blade, two further guide chamfers provide maximum alignment accuracy, concentricity and positional accuracy in the bore being machined.
This allows highly accurate roundness and diameter tolerances to be achieved.
Carbide substrates with MxF coating are supplied as cutting materials.
The coating, which has been specially developed for bore machining, ensures optimum chip flow and long tool life.
* Multiple use for holders - the holders for the Mapal replaceable head drills are designed so that they can hold drill heads with different diameters within a 1mm range.
The standard range of Mapal replaceable head drills covers the diameter range 15.0 - 30.0mm; holders of drilling depths of 3xD and 5xD are included in the programme.
However, because of the geometry of the drill heads, which are designed for maximum precision and economy, larger length to diameter ratios are also possible.
Action against waste in production processes is very specifically the focus of all new developments at MAPAL.
The replaceable head drill with the features which are described above represents a typical Mapal solution against waste in production processes: * Less use of carbide and fewer ongoing tool costs compared to carbide drills.
* Higher accuracy in the bore and shorter machining times compared to insert drills.
* Less handling time because of Mapal radial clamping system.
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