Machining tool

Details Machining tool Machining tool

1996-10-25

1998-11-17

Pitts, Andrea L.

Cutters, for shaping

Including holder having seat for inserted tool

With separate means to fasten tool to holder

407102, 407113, B23B 2716, B23B 2904

Patent

active

058367233

DESCRIPTION:

BRIEF SUMMARY
CROSS-REFERENCE TO RELATED APPLICATIONS

This application is the US national phase of PCT application PCT/DE95/00018 filed 7 Jan. 1995 with a claim to the priority of German patent application P 44 15 425.9 filed 3 May 1994.


FIELD OF THE INVENTION

The present invention relates to a machining tool with a cutting insert releasably held by a clamp dog in a tool holder. More particularly this invention concerns a parting tool.


BACKGROUND OF THE INVENTION

It is for example known from German patent document 3,434,089 to clamp a parting tool by means of a longitudinally slidable retaining blade against a tool holder by actuating a retaining screw. The corresponding clamp surfaces of the clamp plate as well as of the cutting insert each have a prismatic shape.
A clamping system is known from German patent document 3,219,150 where the cutting insert and the upper clamp jaw are provided with a stop limiting insertion so that when the stop is subjected to high pressure it swings back lever fashion and lets the cutting insert into the clamping gap. The opposite cutting-insert and clamping-arm clamp surfaces serving for transmitting and withstanding the vertical clamping forces are set to diverge from one another in the direction of the closed end of the clamping gap.
A machining tool is suggested in European patent document 0,388,688 whose tool holder and cutting insert each have interengaging prismatic clamp surfaces of which one interengaging pair of clamp surfaces is set at an angle to exert a force on the cutting insert toward the open end of the clamping gap when the clamp arm is pressed by the retaining screw on the cutting insert. This creates a pincer-like engagement of the cutting insert. The disadvantage of this embodiment is that, when the retaining screw is tightened, the cutting insert is shifted before the vertical clamping force is sufficient to hold the cutting insert down in the seat. As a result of the prismatic shape of the upper clamp surface and the angled underlying clamp surface the cutting insert can become canted. The described clamp surfaces can also be formed convex or concave.
U.S. Pat. No. 3,894,322 describes a tool that has four clamp surfaces that run parallel to the cutting edge or edges and that form in cross section a parallelogram. The clamp jaws are complementarily shaped so that when the retaining screw is tightened the upper clamp jaw presses the cutting insert into the seat. This cutting insert is however only retained against shifting perpendicular to the cutting edge, not against transverse shifting, that is parallel to the cutting edge.


OBJECT OF THE INVENTION

It is an object of the present invention to further develop the machining tool of the above-described type so that the cutting insert is retained against movement in any direction.


SUMMERY OF THE INVENTION

This object is obtained according to the instant invention by a machining tool wherein
This object is attained by the machining tool according to claim 1 that is characterized according to the invention in the clamp dog has on its side turned toward the cutting insert a clamp bump which engages in a corresponding cutting-insert recess or a clamp recess which engages over a corresponding cutting-insert projection, the clamp bump engaging on the cutting-insert recess or the clamp recess engaging on the cutting-insert projection at three or more points such that the cutting insert is secured in all directions, in particularly horizontally, that is perpendicular to the clamping direction. The support face of the tool and of the cutting insert are preferably formed prismatic.
Furthermore preferably the clamp bump or clamp recess on the one side and/or the corresponding cutting-insert recess or cutting-insert projection on the other side have the shape of a three, four-, or more-sided frustopyramid, a part-spherical or ellipsoidal rotation surface or a semispherical or ellipsoidal body of revolution or a elongated round shape with angled side surfaces seen in top view.
In generally, in particular with ceramic cut

REFERENCES:
patent: 2870523 (1959-01-01), Richard
patent: 5682803 (1997-11-01), Boianjiu
patent: 5702210 (1997-12-01), Boianjiu

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