Tool for machining workpieces

• US 10,155,272 B2
• Filed: 10/20/2015
• Issued: 12/18/2018
• Est. Priority Date: 10/15/2014
• Status: Active Grant

• Current Assignee: Kennametal Incorporated
• Original Assignee: Kennametal Incorporated
• Inventors: Denks, Norbert, Foettinger, Sebastian, Heinloth, Markus, Kurz, Jochen, Lill, F. H. Erich, Sponsel, Guenter
• Primary Examiner(s): FRIDIE JR, WILLMON
• Application Number:
  US14/918,124
• Publication Number:
  US 20160107250A1
• Time in Patent Office: 1,155 Days
• CPC Class Codes: B23C 2270/025 Hydraulics
• CPC Class Codes: B23C 5/2234 for plate-like cutting inserts fitted on a ring or ring segment
• CPC Class Codes: B23D 2043/063 with cutters mounted externally
• CPC Class Codes: B23D 43/06 for cutting by rotational movement

Abstract

A tool (2) for machining workpieces, comprising a carrier (4) rotating in an axial direction (A) during operation, and further comprising multiple cutting segments (6), which are fastened to the carrier (4) in a radial direction (R), characterized in that at least one hydraulic clamping unit (21) is attached to the carrier (4) for clamping at least one of the cutting segments (6) to the carrier (4).

Claims

1. A tool for machining workpieces, comprising a carrier rotating in an axial direction during operation, and further comprising multiple cutting segments, which are fastened to the carrier in a radial direction,

wherein at least one hydraulic clamping unit is attached to the carrier for clamping at least one of the cutting segments to the carrier;

and

wherein the cutting segments can be reversibly fixed, by clamping, to the carrier jointly by a clamping ring.

2. The tool according to claim 1, wherein the carrier and the clamping ring are spaced apart from one another in the axial direction and form a clamping groove in which the cutting segments are seated.

3. The tool according to claim 1, wherein the clamping ring can be displaced in the axial direction relative to the carrier for this purpose by means of the hydraulic clamping unit.

4. The tool according to claim 2, wherein each of the cutting segments has a segment base, which is seated in the clamping groove, and at least one of the parts, selected from the parts that are the carrier and clamping ring, has a circumferential collar, which tapers the clamping groove on a radially external section and surrounds the segment base.

5. The tool according to claim 4, wherein the collar has an oblique gripping surface which points inwardly with respect to the clamping groove and engages an outwardly pointing, oblique shoulder surface of the segment base.

6. The tool according to claim 1, wherein a transformation element, which is designed to transform a radial movement generated by the hydraulic clamping unit into an axial movement of the clamping ring, is arranged on the carrier.

7. The tool according to claim 6, wherein the transformation element has a clamping wedge, which can be displaced in the radial direction by means of the hydraulic clamping unit and, with a wedge surface, engages a wedge bearing surface of the clamping ring so as to axially displace the same.

8. The tool according to claim 1, wherein a pull-out limiter, which specifies a maximum axial pull-out of the clamping ring during detachment of the cutting segments.

9. The tool according to claim 1 further comprising a clamping element which is used to generate hydraulic pressure by means of the hydraulic clamping unit and, for this purpose, can be toggled between a clamping position and a release position, so as to clamp and release the cutting segments.

10. The tool according to claim 9, wherein the at least one hydraulic clamping unit comprises multiple hydraulic clamping units which can be actuated jointly by means of the clamping element.

11. The tool according to claim 9, wherein the clamping element is formed as a rotating annulus which can be toggled between the clamping position and the release position by a rotation.

12. The tool according to claim 9, wherein in order to toggle between the clamping position and the release position, at least one eccentric actuating element is attached on the clamping element so as to actuate the hydraulic clamping unit when toggling into the clamping position.

13. The tool according to claim 1, wherein at least one slot nut is fastened to the carrier for each of the cutting segments so as to position the cutting segments in the circumferential direction.

14. The tool according to claim 1, wherein the hydraulic clamping unit is a self-contained assembly which is mounted to the carrier.

15. A tool for machining workpieces, comprising a carrier rotating in an axial direction during operation, and further comprising multiple cutting segments, which are fastened to the carrier in a radial direction,

wherein at least one hydraulic clamping unit is attached to the carrier for clamping at least one of the cutting segments to the carrier;

and

wherein a clamping element, which is used to generate hydraulic pressure by means of the hydraulic clamping unit and, for this purpose, can be toggled between a clamping position and a release position, so as to clamp and release the cutting segments; and

wherein the at least one hydraulic clamping unit comprises multiple hydraulic clamping units which can be actuated jointly by means of the clamping element.

16. A tool for machining workpieces, comprising a carrier rotating in an axial direction during operation, and further comprising multiple cutting segments, which are fastened to the carrier in a radial direction,

wherein at least one hydraulic clamping unit is attached to the carrier for clamping at least one of the cutting segments to the carrier;

and

wherein a clamping element, which is used to generate hydraulic pressure by means of the hydraulic clamping unit and, for this purpose, can be toggled between a clamping position and a release position, so as to clamp and release the cutting segments; and

wherein the clamping element is adapted to be toggled between the clamping position and the release position by at least one of the following (a) or (b);

(a) the clamping element is formed as a rotating annulus, which can be toggled between the clamping position and the release position by a rotation;

or

(b) in in order to toggle between the clamping position and the release position, at least one eccentric actuating element is attached on the clamping element so as to actuate the hydraulic clamping unit when toggling into the clamping position.

17. The tool according to claim 16, wherein the clamping element is formed as a rotating annulus, which can be toggled between the clamping position and the release position by a rotation.

18. The tool according to claim 16, wherein in order to toggle between the clamping position and the release position, at least one eccentric actuating element is attached on the clamping element so as to actuate the hydraulic clamping unit when toggling into the clamping position.