TOOL FOR CUTTING MACHINING

Abstract

The tool exhibits a first tool part (2) and a second tool part (3), which possess a common axis of rotation (A). The first tool part (2) is provided with an alignment pin (4) and exhibits at its root an annular surface (5). The second tool part (3) possesses an axial bore (7) to receive the alignment pin (4) and an annular surface (6), which is capable of being tensioned against the annular surface (5) of the first tool part (2). Tensioning means (8, 9, 10) serve for the axial tensioning of the two tool parts (2, 3) to one another. The tensioning means (8, 9, 10) exhibit three retaining screws (8, 9, 10) arranged distributed around the periphery of the second tool part (3), which retaining screws are each screwed radially into a threaded bore (12, 13, 14) of the second tool part (3) and each engage in a radial bore (21, 22, 23) of the alignment pin (4). A recess (16, 17, 18) is allocated to each bore (21, 22, 23), so that the alignment pin (4) is caused to become polygonal at its periphery by tensioning the retaining screws (8, 9, 10) of the alignment pin (4). Higher stability and vibration damping can be achieved because of the polygonal bulging of the alignment pin (4). The tool is further characterized by its high compatibility and ease of operation.

Description

An illustrative embodiment of the invention is explained below in greater detail with reference to the drawing, in which:

FIG. 1 depicts a section through the tool according to the invention;

FIG. 2 depicts schematically the location of a retaining screw in a bore in the alignment pin;

FIG. 3 depicts a three-dimensional view of the alignment pin;

FIG. 4 depicts a further three-dimensional view of the alignment pin;

FIG. 5 depicts a three-dimensional view of a sectorally cut tool according to the invention;

FIG. 6 depicts a section according to FIG. 1 to explain the surface pressure applied to the periphery of the alignment pin;

FIG. 7 depicts a partially sectioned tool according to the invention to explain the forces acting thereon;

FIG. 8 depicts a schematic three-dimensional view of the first tool part;

FIG. 9 depicts schematically a radial section through the second tool part;

FIG. 10 depicts a force parallelogram.

Claims

1. A tool for cutting machining, having a first tool part and having a second tool part, which exhibit a common axis of rotation, the first tool part exhibiting an alignment pin and at its root an annular surface, and the second tool part exhibiting an axial bore to receive the alignment pin and an annular surface, which is capable of being tensioned against the annular surface of the first tool part with tensioning means for the axial tensioning of the two tool parts to one another, the tensioning means exhibiting three retaining screws arranged distributed around the periphery of the second tool part, which retaining screws are each screwed radially into a threaded bore of the second tool part (3) and each engage in a radial bore of the alignment pin, wherein the angle between a first retaining screw and a second retaining screw is smaller than 120° and larger than 90°, and in that the angle between the first retaining screw and the third retaining screw is identical with the angle between the third retaining screw and the second retaining screw.

2. The tool as claimed in claim 1, wherein the angle between the first retaining screw and the second retaining screw lies in the range from 95° to 105°.

3. The tool as claimed in claim 1, wherein the angle between the first retaining screw and the second retaining screw is in the order of 100°.

4. The tool as claimed in claim 1, wherein a recess in the alignment pin is allocated to each radial bore, so that the alignment pin is capable of being caused to bulge at its periphery by tensioning the retaining screws.

5. The tool as claimed in claim 4, wherein the recesses in the alignment pin extend axially through the bores of the alignment pin.

6. The tool as claimed in claim 4, wherein at least one recess in the alignment pin is open at the end surface of the alignment pin.

7. The tool as claimed in claim 4, wherein at least two, and preferably all three recesses in the alignment pin are open at the end surface of the alignment pin.

8. The tool as claimed in claim 4, wherein the recesses are comparatively narrow slots with a width of 0.2 to 0.4 mm, and preferably approximately 0.3 mm.

9. The tool as claimed in claim 8, wherein the recesses are produced with a laser.

10. The tool as claimed in claim 4, wherein the recesses are slots with a width of about 1 mm to 5 mm.