Cutters – for shaping – Including holder having seat for inserted tool – With tool ejector
Patent
1982-10-19
1984-04-17
Vlachos, Leonidas
Cutters, for shaping
Including holder having seat for inserted tool
With tool ejector
407 50, 407110, 407117, 407 90, 83839, 83845, B26D 100
Patent
active
044431368
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD OF THE INVENTION
The invention relates to a machine cutting tool which comprises replaceable cutting inserts and a holder for a self-gripping attachment of the cutting inserts.
Prior Art
Cutting tools of this kind are known, for example, from German Utility Pat. No. 70 07 326. They have two seat jaws opposite each other, comprising contact surfaces which are formed complementary to opposite, when in working position, contact surfaces of a cutting insert and convex or concave guide means within the contact surfaces. The holders of these known tools are wedge-shaped. These cutting tools, however, have the disadvantage that the cutting insert is often not firmly enough seated so that when the tool is used for cutting in or cutting off, the workpiece can be damaged if the cutting insert falls out. Furthermore, it has already occured that the cutting insert was pulled out while the cutting tool was reversing. It is easily imaginable that this may lead to heavy damages of the workpieces as well as of the turning lathes, turning machines, and high-capacity numerically controlled (N/C) automatic machines which are preferably used for these tools.
Characteristics of the Invention
It is the object of the invention to produce a cutting tool comprising replaceable cutting inserts in which a self-locking, secure seat is guaranteed in any case, i.e., in which a cutting insert cannot be taken out from a holder without a special tool of the simplest kind. This object is achieved in that the cutting insert is insertable into the holder by turning it in the direction of the forces acting on the cutting edge about an axis parallel to the cutting edge, the contact surfaces having the shape of an approximate circular arc about the center of rotation of the cutting insert whose distance from the center of rotation of the cutting insert whose distance from the center of rotation decreases in the direction of turning as well as an insert groove in the depth of the holder between the contact surfaces, and a flat segment at the cutting insert which is adjacent to the contact surfaces.
Further developments of the invention are understandable in particular from the dependent claims.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention is now described in detail by means of practical examples in association with the accompanying drawings in which:
FIG. 1 is a side elevation of the cutting tool according to the invention;
FIG. 2 is a top view;
FIG. 3 is a front elevation;
FIGS. 4 and 5 show a somewhat modified cutting insert and a relevant thereto holder on an enlarged scale;
FIG. 6 shows the insertion of a cutting insert into a storage bin;
FIG. 7 shows a cutting insert in working position;
FIG. 8 shows a further embodiment of the invention on the basis on an example of use.
GENERAL DESCRIPTION OF THE INVENTION
FIGS. 1, 2 and 3 show a cutting tool 1 comprising a holder 2 adapted for the insertion of a cutting insert, the width of the opening 3 of the holder being indicated by an arrow which is not numbered.
A cutting insert 4 is inserted into the holder 2, the cutting insert 4 having one, but preferably two cutting edges 5 and 5'. The position shown here is a working position. The cutting insert is inserted into the holder 2 with its "narrow side". In other words, the diameter of the cutting insert obliquely to the narrow side is larger than the width of opening 3 of holder 2.
Holder 2 has two seat jaws opposite each other, comprising contact surfaces 6 of the form of an approximate circular arc about the center of rotation M of the cutting insert 4 whose distance 10, 11 from the center of rotation M decreases in the direction of turning the cutting insert (see arrow A). The contact surfaces 6 include negative or positive guide means which serve for integrating complementary guide means into contact surfaces 9 of the cutting insert. When the guides are guide grooves, the contact surfaces 9 of the cutting insert have guide tongues, which are complementary thereto. These guide grooves or guide tongues may have an
REFERENCES:
patent: 80929 (1868-11-01), Disston
patent: 488336 (1892-12-01), Kendall
patent: 744228 (1903-11-01), Peelle
patent: 3785021 (1974-01-01), Norgren
ISCAR Hartmetall Gesellschaft mit beschrankter Haftung
Vlachos Leonidas
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