Product category:
Milling cutters
News Release from: Stellram | Subject: 7791VS indexable-insert plunge milling cutters
Edited by the Manufacturingtalk Editorial
Team on 23 January 2004
Plunge cutters mill alloys and SS at
high rates
Plunge milling cutters are designed for high metal removal rates when machining a wide variety of metals including stainless steel aluminium and high temperature alloys.
Designed for high metal removal rates, particularly when roughing, a new range of indexable-insert plunge milling cutters has been introduced by Stellram Designated 7791VS, they are ideal for machining a wide variety of metals from stainless steel through all grades of steel, cast irons, aluminium alloys and high temperature alloys
This article was originally published on Manufacturingtalk on 21 Mar 2001 at 8.00am (UK)
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Combining three milling functions into one cutter reduces tooling inventory costs and simplifies programming when machining cast irons, steels, and ferrous and non-ferrous alloys.
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High productivity and security is offered by the Stellram 7702 multi-functional tooling intended for mould and die machining and milling operations in the aerospace and automotive industries.
Utilising plunge milling techniques for roughing and semi-finishing applications can increase productivity between 3 and 10 times over traditional profiling operations.
Recent improvements in carbide grades, insert clamping systems, cutter bodies and swarf evacuation have enabled the emergence of the plunge milling technique.
Large volumes of material may be removed by taking a mill that cuts on its face and repeatedly plunging it axially into the workpiece in an overlapping pattern, using only the spindle infeed on both vertical and horizontal machining centres.
Further reading
Turning tools are dedicated to precision parts
Complex internal and external cylindrical profiles, as well as single-point threading and grooving, are generated by Stellram's wide range of Posimatic inserts and tools.
Mini tooling grooves, threads and bores
Stellram's Ultra-mini programme, consists of replaceable carbide tools that locate in a common steel shank. The tools cover application ranges for grooving, threading and boring in small parts.
The main advantage is that, in the absence of side loads generated by feeding the cutter in the other two orthogonal axes, the rigid milling action allows the tool to cut a larger cross section of metal for a particular feed rate.
The result is efficient milling with minimal tool deflection and vibration combined with increased tool life.
As the milling action is more forgiving of machines that are less rigidly constructed, improved surface finishes are obtained.
Moreover, the technique tends to draw less power than other types of milling for a given metal removal rate, allowing high productivity in shops where the machine tools may have only moderate spindle power and torque.
Stellram's 7791VS products employ a shell mill body, utilising inserts with four cutting edges around the periphery, that takes either an 8mm or 11mm maximum radial cut as it plunges down the wall of a component, which may be vertical, sloping or profiled.
The smaller inserts are used with four cutters ranging from 25mm to 50mm diameter while the larger inserts are employed for the same number of larger mills from 63mm to 125mm diameter.
The manufacturer provides a comprehensive chart giving the height of the scallop created by each cutter for a range of different step-overs.
A wide range of grades is available for diverse applications from aerospace to mould making.
The tool is expected to be especially popular in the latter sector as its design criteria of high metal removal in unstable conditions, such as deep cavities, will appeal to customers concerned with productivity. Request a free brochure from Stellram ...
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