Milling cutter

Details Milling cutter Milling cutter

1983-10-21

1985-01-15

Vlachos, Leonidas

Cutters, for shaping

Rotary cutting tool

Including holder having seat for inserted tool

407 49, B23C 522

Patent

active

044935943

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND AND OBJECTS OF THE INVENTION

This invention relates to a milling cutter for clamped cutting inserts (as distinguished from inserts secured by brazing), in which a cutting insert is held in position relative to a cutter body by means of a clamping means. The clamping means is adapted to rest against the cutting insert at a first contact surface on a preferably flat first side face on the cutting insert and against the cutter body at a second contact surface. The cutting insert is adapted to rest directly or indirectly against a first supporting surface on the cutter body by means of a second side face, which is opposite to the first side face on the cutting insert. The clamping means is adapted to bridge an edge portion on the cutting insert by means of a side portion which interconnects the first and second contact surfaces without contacting the edge portion; said edge portion being provided on an edge surface which interconnects the first and second side faces of the cutting insert.
An object of the present invention is to provide a clamping means which does not disturb the chip flow without requiring a large extent radially inwards.
Another object of the invention is to positively fix the axial position of the cutting insert.
A further object of the invention is to provide the milling cutter with detachable clamping and supporting means such that cutting with positive as well as negative axial rake angles is possible.
The above and other objects of the invention are attained by giving the invention the characterizing features stated in the claims following hereinafter.


THE DRAWINGS

The invention is described in detail in the following description with reference to the accompanying drawings. It is to be understood that the illustrated embodiments are only shown by way of example and that various modifications may be made within the scope of the claims.
In the drawings,
FIG. 1 is a perspective view of a milling cutter according to the invention showing one cutting insert mounted and one cutting insert detached.
FIG. 2 is a section taken on the line II--II in FIG. 1.
FIG. 3 shows a section corresponding to that in FIG. 2, wherein cutting insert, supporting plate and wedge block are detached.
FIG. 4 shows a side view of a portion of the milling cutter in FIG. 1.
FIG. 5 shows a fragmentary top view of the milling cutter in FIG. 1 having a modified supporting plate.
FIG. 6 shows a fragmentary top view of the milling cutter in FIG. 1 having the supporting plate and the wedge block designed such that a negative axial rake angle is obtained.


DETAILED DESCRIPTION OF THE INVENTION

In the drawings, the cutter body of the milling cutter is denoted by 10. The cutter body has recesses 11 in the periphery thereof for tungsten carbide cutting inserts 12 and their clamping and supporting means. The supporting means of the cutting inserts 12 consist of detachable supporting shim plates or supporting seats 13. The clamping means consist of detachable wedge blocks 14. The wedge blocks 14 are clamped against the cutting insert 12 by means of screws 15. The screw 15 is provided with a left hand thread portion and a right hand thread portion; the one portion being screwed into the wedge block 14 and the other portion into the cutter body 10.
The cutting insert 12 is provided with opposite flat side faces 16, 18. The wedge block 14 bears against a reaction surface 14A of the cutter body and rests against the side face 16 at a contact surface 17. By means of its side face 18 the cutting insert 12 rests against a side wall 13A of the supporting plate 13. The supporting plate 13 also has a first seating surface 18A which is attached to a supporting surface 19 on the cutter body by means of a screw, not shown.
By means of a radially inner edge surface 20 the cutting insert 12 rests against a stepped portion 26 on the supporting plate 13 which in turn has a second seating surface 18B which rests against a second supporting surface 21 on the cutter body 10 which defines part of a floor of the recess. The edge surfac

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patent: 3268977 (1966-08-01), Diemond
patent: 3273222 (1966-09-01), Begle
patent: 3391438 (1968-07-01), Milewski
patent: 3475802 (1969-11-01), Kollar
patent: 3757397 (1973-09-01), Lindsay

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