DE7928667U1 - CUTTING TOOL, ESPECIALLY FOR A LATHE - Google Patents

Description

DIPL-ING. H. FINK PATENTANWALT · D 7300 ESSLINGEN NEAR STUTTGART · HINDENBURGSTRASSE Potenton volt Fl NK. D 7300 Eulingen (N «dior), Hln d« t iburattro6 «44

September 14, 1979 By P 6569

Paul Horn, Im Kleeacker 23, 7400 Tübingen 1 "Cutting tool, especially for a lathe"

The invention relates to a cutting tool according to the preamble of claim 1.

In a known cutting tool of the aforementioned type, the wedge-shaped projection is on one of the sides of the clamping body *

pers arranged, which adjoins the side which |

rests against the wall of the recess. Seen in the clamped position of the holder, the fastening screw is in this from above screwed in. The cutting insert is secured solely by the wedge-shaped projection under the fastening screw applied force is applied to the cutting attachment, held in its position. Such a design of the clamping body is suitable particularly suitable for plate-shaped cutting inserts on which the clamp body rests against one of the narrow sides (DE-OS |

26 44 068).

It is an object of the present invention to provide an improved cutting tool. This task will by the features in the characterizing part of claim 1 solved according to the invention. This ensures a secure clamping by the predetermined abutment of the adhesive body on two of each other separate points on the cutting insert and at one point

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le on the wall of the recess receiving the clamping body reached in the holder. When the fastening screw is tightened, the clamping body is tilted into its clamping position, in which its Axis is arranged at an acute angle to the axis of the Be f it timing screw.

An improved system of the cutting insert on the clamping body and on the wall of the holder is achieved by the features of the claim 2 reached.

The features of claim 3 make a highly stressed part of the holder replaceable.

The features of claim 4 lead to a backup of the holder.

Further advantages result from the other claims, the description and the drawing. In this is a piercing tool shown schematically as an embodiment of the subject matter of the invention. Show it

Fig. 1 is a side view,

FIG. 2 shows a section along line H-II in FIG. 1 on a larger scale.

One that can be clamped into a tool holder of a lathe or the like Clamp holder 1 is designed at its end facing away from the clamping end for receiving a cutting insert 2, which has a rectangular shape in cross section, which approximates a square.

The cutting plate 2 is supported by a support piece 3, which by means of two fastening screws 4 and 5 and one Pin 6 on the clamp holder 1 "is attached and in one of the support piece 3 adapted recess housed in the clamp holder 1

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P 6569

is. The support piece 3 is in itself a part of the clamp holder 1. The cutting insert arranged at an angle to the axis of the clamp holder 1 2 is supported on its underside by two arranged on the support piece 3 projections 7, 8 and on her of the side facing away from the cutting edge from one on the support piece 3 located projection 9. The Traostück 3 is slightly narrower than the cutting insert 2 and on its of the fastening screws 4, 5 side facing away the same width as the cutting edge of the cutting plate 2. So that the support piece 3 both can be attached to the right as well as left on a correspondingly designed clamp holder 1, which are the fastening screws 4 and 5 receiving bores, at both ends for receiving the KÖDfe of the fastening screws 4, 5 countersunk. On the side of the pin 6 facing away from the cutting stick 2, in the trailing piece 3 there is a width across its width Reaching incision 10 provided such that between the 2in section and the hole receiving the pin on one side and between the pin and the side facing away from it of the support piece 3 on the other side is a predetermined breaking point, so that overloads of the clamp holder 1 and of the tool carrier or the lathe carrying it can be prevented.

On the side of the cutting plate 2 facing away from the support piece 3, a clamping body 11 is arranged, which is in a recess 12 sits in the clamp holder 1. The seat is chosen so that in the loose position of the clamping body 11 in the recess 12 between the cutting insert 2 and the wall opposite this the recess 12 is only a slight sniel.

The clamping body 11 is embodied in a traneziform manner as seen in FIG. 1 and by a fastening screw 13 that penetrates the tranez sides and is screwed into the clergy holder 1 held, the one keoel-shaped, on the. Fand detached head which is in a countersink adapted to it with play

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P 6569

located in the clamp body. For the purpose of the possibility of arranging the flamming body 11 on each of the two sides of the Clamp holder 1 is the countersink at both ends of the fastening screw 13 receiving through holes provided. Between the part screwed into the clamp holder 1 the fastening screw 13 and the clamping body 11 is located f;

an inserted into a groove of the fastening screw 13 f

ter spring ring 14, the outer diameter of which is greater than the diameter the hole receiving the fastening screw in the clamping body 11, so that this is when the fastening screw is removed 13 can be safely removed from its clamping position.

The clamping body 11 rarely has a wedge-shaped projection 15 than the cutting insert 2, which extends along its edge and in the area of its contact surface has a recess on an adjacent inclined edge of the cutting insert 2, so that the projection 15 only has two spaced apart parts the cutting plate 2 rests. This in turn rests on the opposite side against a projection, not shown, of the clamp holder 1. With the exception of the wedge-shaped projection 15, all sides of the clamping body 11 run perpendicular to the trapezoid sides. The bore in the clamping body 11 penetrated by the fastening screw 13 is arranged in such a way that it runs at an acute angle α, in particular of 2, to the trapezoidal sides of the clamping body 11. 7wischen the fastening screw 13 and the hole penetrated by this in the clamping body 11 is such a game before z. B. 4/10 mm available that when tightening the fastening screw 13, as shown in Fig. 2, the side of the clamping body 11 bearing the wedge-shaped projection with the wedge-shaped projection 15 and with its edge remote therefrom rests against the cutting tip 2 and that the the edge adjacent to the projection 15 on the opposite side of the clamping body 11 on the wall of the

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Recess 12 is applied. In this position the axis is the for Receiving the fastening screw 13 serving hole in the clamping body 11 opposite the axis of this fastening screw arranged inclined at the acute angle a.

The sides facing the working edge of the cutting insert 2 the clamp body 11 and the clamp holder 1 are arranged so that they are in a common, for chip removal serving level lie. The clamp body 11 has on his the cutting tip 2 and the clamping holder adjacent side has a recess 16, which in the direction of the working cutting edge the protruding part of the clamping body 11 is limited to a width which corresponds to the narrowest cutting tip 2.

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Claims (7)

te *> * DiPL-iNG. H. FINK PATENTANWALT ■ D 7300 ESSLINGEN NEAR STUTTGART · HINDENBURGSTRASSE Potwttowoit FINK-D 7300 Eglingtn (Nadcor). Klndenburg Council «4 4 September 14, 1979 By P 6569 I Paul Horn, Im Kleeacker 23, 7400 Tübingen 1 I claims I 1. Cutting tool, especially for a lathe, I with: a holder for a cutting insert, which by means of I fasten one to the holder with a ^ fastening screw. on the side facing the cutting insert T ~ has a wedge-shaped projection provided in its X intended to rest on the cutting insert i cutting position can be determined, whereby the fastening screw [be with a screw head resting on the clamp body I is provided and in a recess of the holder un- ■ · brought and resting on a wall of the recess- j penetrates the clamping body, thereby geke η η - ' ⁽ indicates that the wedge-shaped projection (15) on j the side of the clamping body (11) is arranged, which the on the wall of the recess (12) opposite side that <? he clamping body with play in the space between the wall of the recess intended for its installation and the cutting insert fits that the bore in the clamping body opposite the sides, one of which rests against the wall i of the recess and the other the wedge-shaped 1 has projection, is arranged such that the part of the side opposite the I wedge-shaped projection I rests against the wall of the recess and that the wedge-shaped Projecting side with their from this ■ · ■ * - 2 - Sept. 14, 1979 By P 5569 Projecting edge facing away from the cutting boss, and in that between the fastening screw (13) and the clamp body such a game exists _# that the clamping member can take up its tilting position with respect to the fastening screw. 2. Cutting tool according to claim 1 , characterized in that the wedge-shaped projection C5) has two spaced apart parts and that a projection is provided on the contact pressure of the cutting insert (2) receiving the contact point on the Haitsr (1). 3. Cutting tool according to claim 1 or 2, characterized in that the cutting insert (2) on the side facing away from the clamping body (11) by a support piece (3) detachably attached to the holder (1) on three is supported at spaced locations, one of the locations on another side of the Cutting insert rests than the other two places. 4. Cutting tool according to claim 3, characterized. that on the support piece (3) one by one Incision (10) limited predetermined breaking point is provided. 5 _e cutting tool according to claim 4, characterized in that the incision (10) is arranged in the vicinity of a hole designed for the passage of a fastening or securing means (4, 5 or 6). 6. Cutting tool according to one of Claims 3 to 5, characterized in that the holes for the passage the fastening means (4, 5) and / or the securing means (6) on both of the opposite sides Sides are countersunk. -2a- April 6, 1983 By P 6569 7. Cutting tool according to one of the preceding claims, characterized in that the wedge-shaped projection (15) on a beveled edge of the cutting insert (2) is in contact.