Cutting by use of rotating axially moving tool – With work-engaging structure other than tool or tool-support – Frictionally engaging sides of opening in work
Patent
1998-09-02
2000-03-07
Howell, Daniel W.
Cutting by use of rotating axially moving tool
With work-engaging structure other than tool or tool-support
Frictionally engaging sides of opening in work
408199, 408227, B23B 5100
Patent
active
060331593
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a reamer for the material-removing finishing machining of drilled surfaces in workpieces made of metal.
Tools, in particular reamers, of the type discussed here are distinguished by the fact that a blade insert is assigned a diametrically opposite guide bar, with the machining diameter of the tool being determined by the blade insert and the guide bar. To stabilize the tool inside the drilled hole, a further guide bar is provided, which trails the blade insert--as seen in the direction of rotation of the tool--by approx. 40.degree.. Tools of the type described here allow drilled surfaces to be finish-machined so as to achieve a high level of dimensional accuracy and a high surface quality. The disadvantage has emerged that the cutting power of the tool is frequently insufficient even when the operating speed is increased.
SUMMARY OF THE INVENTION
The object of the invention is to provide a reamer for the material-removing finishing machining of drilled surfaces which does not have these drawbacks.
It is proposed to achieve this object by means of a reamer of the type mentioned at the outset which is distinguished by the fact that the basic arrangement of the first blade insert and the two associated guide bars is retained and that an additional blade insert is provided. In order to ensure optimum support for the tool in the drilled hole to be machined, the additional blade insert is arranged ahead of the guide bar situated opposite the first blade insert, and spacing ahead of an angle of 20.degree. to 50.degree., in particular of 30.degree. to 45.degree., has proven advantageous. An angle of lead of approximately 40.degree. has proven particularly suitable. This arrangement ensures that the guide bar situated opposite the first blade insert trails the second blade insert by approximately 40.degree.. Consequently, two blade inserts and two guide bars which in each case trail the blade insert by 40.degree. are provided in the reamer. Moreover, in a preferred embodiment of the reamer a further guide bar is provided diametrically opposite the second blade insert. A reamer of this nature is therefore distinguished by the fact that the, Y-shaped arrangement of one blade insert and two guide bars, which was already known, is now achieved in duplicate.
Moreover, in a preferred embodiment of the reamer the Y-shaped arrangement of one blade insert and two guide bars is assigned a third blade insert, which is arranged opposite the first guide bar which trails the first blade insert by approximately 40.degree..
In a further preferred embodiment of the reamer, the blade insert which lies opposite the first guide bar is assigned a further guide bar which trails by approximately 40.degree.. In this way too, it is possible to achieve two Y-shaped arrangements of two blade inserts and in each case two guide bars.
Finally, in a preferred embodiment the reamer has three blade inserts, ensuring at least one Y-shaped basic arrangement of one blade insert and two associated guide bars.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be explained in more detail with reference to the drawings, in which:
FIG. 1 shows a basic diagram of a front view of a tool with two or three cutting edges;
FIG. 2 shows a basic diagram of a front view of a tool with four cutting edges, and
FIG. 3 shows a basic diagram of a front view of a tool with five cutting edges.
DESCRIPTION OF PREFERRED EMBODIMENTS
The basic in FIG. 1 shows a front view of a tool 1 which is preferably designed as a reamer. Grooves 5 to 13, into which cutting tips and guide bars are inserted in known manner, are formed in the circumferential surface 3 of the tool 1. A first blade insert 15--as seen in the direction of rotation of the tool leads a first guide bar 17 by an angle .alpha.. Blade 15 is situated in the groove 5. The lead angle .alpha. may lie in a range from 20.degree. to 50.degree.. In particular an angle of from 30.degree. to 45.degree. is selected. An angle .alpha. of approximately 40.degree
REFERENCES:
patent: 4076445 (1978-02-01), Kress et al.
patent: 4133399 (1979-01-01), Herrmann
patent: 4184794 (1980-01-01), Henninghaus
patent: 4264246 (1981-04-01), Lowis et al.
patent: 5125772 (1992-06-01), Kress
Haberle Friedrich
Kress Dieter
Howell Daniel W.
Mapal Fabrik fur Prazionswerk-Zeuge Dr. Kress KG
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