Shank drill

Abstract

A shank cutter has plural circumferential cutting edges which run in a helical manner in the region of its cutting section and of which at least one critical number are equipped in each case with a preferably essentially flattened roughing profile with chip-separating grooves with rounded bases, so that the chip-separating grooves of cutter ridges which are adjacent in the circumferential direction are axially offset relative to each other. To create a tool which provides long service life by combined advantages of a vibration-stabilized finishing cutter and a conventional roughing cutter, at least one circumferential cutting edge has an angle of twist which differs from that of another circumferential cutting edge. In addition, the chip-separating grooves of the circumferential cutting edges which are equipped with a roughing profile in each case merge into a preferably essentially flattened central section of the roughing profile by means of a predefined flank radius.

Description

CROSS REFERENCED TO RELATED APPLICATIONS[0001]This application is a continuation of U.S. patent application Ser. No. 12 / 533,269, filed Jul. 31, 2009, the entirety of which is incorporated herein by reference as if set forth in its entirety.FIELD OF THE INVENTION[0002]The invention relates to a shank cutter according to the preamble of Patent claim 1.BACKGROUND OF THE INVENTION[0003]Such cutters have as a common feature a shank as the chucking part, which is inserted into the tool holder. Such cutters are used for example as slotting cutters or die-sinking cutters with a flat or round end. Such cutters are furthermore characterised in that they have a plurality of circumferential cutting edges in the region of their cutting section on the cutter ridges which are separated from each other by flutes, which cutting edges run in a helical manner and are in each case configured with a roughing profile in such a manner that the circumferential cutting edges are given chip-separating groove...

AI Technical Summary

Benefits of technology

[0008]The invention is therefore based on the object of developing a shank cutter of the type described at the start, in particular according to the preamble of Patent claim 1 in such a manner that it is in particular suitable for providing a high material removal rate and at the same time machining the workpiece with good surface quality while ensuring high tool life travel, low power consumption of the machine and reduced cutting pressure.

Problems solved by technology

The roughing cutter is however generally not suitable for the production of a uniform surface with a high surface quality.

Also, the cutting pressure and the power consumption of the machine are lower when working with such roughing cutters, and the tool can produce a high cutting depth and cutting width.

If such finishing tools are however used with greater cutting depths or widths, chip removal problems occur owing to the longer and larger chips and also the power consumption and the cutting pressure increase over-proportionately.

Owing to the comparatively high power consumption and the high cutting pressure as well as the critical chip removal as before, this known finishing cutter can also only be operated at relatively small cutting widths.

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