DE3114460A1 - Indexable insert holder - Google Patents

Description

The present invention relates to one & 3K wall cutting insert holder with at least ainar recess Eur, each receiving a parallelogram-shaped if end cutting insert, which recess is limited at the inner end by a two pointed flanks running against each other and facing each other and on the assigned bisector in one third boundary wall extending from plank to flank has a hole for a clamping screw, as well as a parallelogram-shaped indexable insert to equip an indexable insert holder with two acute angles enclosed by the narrow sides »

Indexable insert holders with indexable inserts have been known as turning tools for years. The indexable inserts are polygonal hard metal or high-speed steel inserts with cutting edges, which are axis-type; i5i5etric with two, three or four main cutting edges. The indexable inserts are attached to the indexable insert holder by means of a screw. During a Zei; £;.? R recess panungsvorganges have the mutually facing flanks dG namely öv ¥ receive a portion of the forces occurring ,, orschubkraft and the shaft _power; whereas the main cutting force acts on the boundary wall cornering from flank to flank © eraα; The Drehraaisael have various advantages. On the one hand is the turning point · »

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insert holder practically indefinitely durable. To the others can use the blunt inserts, simply turned over or exchanged for unused ones to make the tool sleek again. That There is no need to grind the blunt tool and precise angles on the tool are always guaranteed.

The present invention has the object; to create a grooving tool or a circular milling cutter, which in the same way as a lathe chisel is made of Indexable insert holder and indexable insert 'exist.

The invention solves the problem in that one of the flanks is at least approximately at right angles to the Direction of the occurring main cutting force is oriented. The object is also achieved in that on one Indexable insert with two acute angles enclosed by the narrow sides to create axially symmetrical ones Main cutting edge with assigned free surface cut off the corners in the area of the apex of the acute angles and that at the intersection of the parallelogram diagonals there is a hole penetrating the broad side.

The innovation is explained using the accompanying schematic drawing, for example. Show it:

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1 shows an indexable insert holder for a grooving chisel,

2 shows an indexable insert holder for a circular milling cutter,

3 shows the detail III in FIG. 1 in an enlarged representation, FIG. 4 shows a plan view of FIG. 3 and FIG. 5 shows a view in the direction of arrow V in FIG. 3.

In Fig. 1, reference number 1 denotes an indexable insert holder, which is rectangular in cross section, whose right end is intended to be clamped in a tool clamping device. The indexable insert holder is at the left end 1 provided with a recess 2 into which, as shown in dash-dotted lines, an indexable insert 3 is inserted. The indexable insert 3 is screwed into a bore 4 by means of a screw, not shown Can be attached to the indexable insert holder 1. The indexable insert holder 1 and the indexable insert 3 form one Grooving chisel. During a piercing process, two forces oriented at right angles to each other occur on the tool that he has to record. These are the shank force Ps (here identical to the feed force) and the main cutting force Ph.

2 shows an indexable insert holder 5

for a circular milling cutter. The indexable insert holder 5 has a disk 6 which is manufactured in one piece with a hub 8. At the periphery of the disk 6 are axially symmetrically offset by 120 about the central axis 7, recesses 2 ¹ for the

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Receipt of one indexable insert ^{3 1} each is provided, which are clamped by means of a ^{screw screwed into a bore 4 1.} An indexable insert holder 5 for a circular milling cutter can have one or more recesses 2 ¹ for receiving an indexable insert 3 ′, the recesses 2 ′, if there are more than one, always being axially symmetrical about the central axis 7.

The design of the recess 2 or 2 'and the indexable insert 3 or 3' will be explained in more detail with reference to FIGS. 3 to 5. The recess 2 has two flanks 9 and 10 which together form an acute angle σ * -. In the area of the apex S of the angle cA, the recess 2 is provided with a pocket 11, which facilitates the cleaning of this corner of the recess 2 before inserting the insert 3 ', so that the insert 3 used does not bite against the boundary walls 9,10,12 of Recess 2 'rests. The recess 3 is further limited by the boundary wall 12, which extends from the flank 9 to the flank 10. The bore 4 is arranged on the bisector, the angle cA. The distance of its axis from the apex S of the angle ■ cK is somewhat smaller than the distance of the axis of the central bore 13 in the indexable insert 3.

The flank 10 extends at right angles to

Main cutting force Ph, whereas the flank 9 forms an acute angle with the vector of the shaft force Ps which is equal to the angle ck iiJt.

The indexable insert 3 is a parallelogram

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shaped plate, which with its narrow sides includes two opposite acute angles / Q, which are the same size as the angle eA enclosed by the flanks 9 and 10. In the area of the acute angle / 3, the corners of the indexable insert 3 are cut off, whereby the free surfaces 14 and the main cutting edges 15 are formed. The width of the main cutting edges 15 is determined by a laterally adjoining recess 16 in the broad side of the indexable insert 3. If one of the main cutting edges 15 is worn, the indexable insert 3 can be rotated 180 around the center axis of its bore 13 and the other main cutting edge can be used.

The center axis of the bore 13 penetrates the intersection of the diagonals of the parallelogram delimiting the indexable insert and has a conical widening 17 on one side. If a vision hood 18 with a conical screw head 19 is now screwed into the bore 4, the screw head 19, as soon as it hits the conical expansion 17, creates a pressure on the indexable insert in the direction towards the apex S of the angle enclosed by the flanks 9 and 10 o (is. by tightening the screw 18, the cutting insert 3 thus not only geqegen the boundary wall 12 but also against the flanks? and pressed for 10. This is the indexable cutting insert 3 sufficient support to resist the occurring during a plunge-forces.

This sufficient holding of the indexable cutting insert 3 in the recess 2 is based on the fact that the flank

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-βίο at least approximately at right angles to the main cutting force Ph extends and the flank 9 intersects the vector of the shaft force at an acute angle.

Ptent lawyers DIpI.-Ing.föEder

Dlpl.-Ing. K.ijchieschke

8 Munich 40, EÄsObethstrasse

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Claims (3)

Patent attorneys Dlpl.-Ing. E. Eder Dlpl.-Ing. K. Schieschke 8 Munich 40, Elisabethstrasse Herbert Deni Spreitenboch - Switzerland 31 14 460 Indexable insert holder Patent claims: (IJ indexable insert holder with at least a recess for receiving one parallelogram each Indexable insert, which recess at the inner end by two mutually acute angles running against each other facing flanks is limited and on the assigned bisector in a third, from flank to Flank extending boundary wall has a bore for a clamping screw, characterized in that a of the flanks (9, 10) oriented at least approximately at right angles to the direction of the main cutting force (PH) occurring is. 2. Indexable insert holder according to claim 1, characterized in that several recesses (2 ·) are present and each in an arm (6) are arranged axially symmetrically around a hub (8), and that the arms (6) with the hub (8) are integrally formed. 3. Parallelogram-shaped indexable insert for equipping an indexable insert holder according to claim 1 or 2 with two acute angles (β) enclosed by the narrow sides, characterized in that to form two axially symmetrical main cutting edges (15) with 130065/0773 31H460 ordered open space (14) the corners in the area of the apex of the acute angle (ß) are cut off, and that in Intersection of the parallelogram diagonals is a hole (13) piercing the broad sides » Patent attorneys Dlpl.-lng.E. | der DIpI.-Ing. K. Softieschke 8 monks 40, Elisa 6% hatraßa 130065/0773