Cutting tool, in particular a boring bar, and method for machining a number of holes

Patent metadata

Field	Value
Publication number	US-10654110-B2
Application number	US-201815922233-A
Country	US
Kind code	B2
Filing date	Mar 15, 2018
Priority date	Mar 22, 2017
Publication date	May 19, 2020
Grant date	May 19, 2020

Abstract

The present application relates to a cutting tool (2), in particular a boring bar (2) for machining holes (16) separated from each other in an axial direction (4) by a given spacing distance (a), comprising a main body (10) extending in an axial direction (4) with an axis of rotation (R) with at least one cutting element (12), as well as with a number of guide elements (14) for guiding the main body (10) within a guide hole (16A), wherein the guide elements (14) for the axis of rotation (R) are separated by a guide radius (r1), wherein viewed in a cross-section, the main body (10) is divided into a functional region (19) and an eccentric region (20), wherein the cutting elements (12) and the guide elements (14) are arranged distributed over the circumference of the main body (10) over an angular region (α) of less than 180°.

First claim

The invention claimed is:

1. A cutting tool comprising a main body extending in an axial direction with an axis of rotation, with at least one cutting element having a cutting edge, as well as with a number of guide elements for guiding the main body within a guide hole, wherein
the guide elements are separated from the axis of rotation by a guide radius,
the main body, viewed in a cross-section, is divided into a functional region and an eccentric region,
the at least one cutting element and the guide elements are arranged And distributed over the circumference of the main body over an angular region (α) of less than 180° measured from the cutting edge of the at least one cutting element,
the circumferential face of the main body in the eccentric region has a distance from the axis of rotation that is less in comparison with the guide radius,
and
the main body has a basic body as well as at least one balance element that is positioned within the eccentric region and is designed to at least partially balance an otherwise existing imbalance, and wherein
a parting plane is formed between the basic body and the balance element which is oriented substantially parallel to within 10° of a midplane that is established by the axis of rotation and the cutting edge of the cutting element, and oriented substantially perpendicular to a deformation direction of the cutting edge.

2. The cutting tool according to claim 1 , wherein two guide elements are provided, and a normal (N) to the parting plane that runs through the axis of rotation forms an angle bisector of the angle between the positions of the two guide elements.

3. The cutting tool according to claim 1 , wherein the balance element is flush with the basic body on the circumferential face.

4. The cutting tool according to claim 1 , wherein the balance element, viewed in a cross-section, is designed as a circle segment.

5. The cutting tool according to claim 1 , wherein the balance element is bonded to the basic body.

6. The cutting tool according to claim 1 , wherein the balance element and the basic body are made of different materials, and the material of the balance element has a greater density than the material of the basic body.

7. The cutting tool according to claim 1 , wherein the main body is divided into at least two parts that are reversibly connectable with each other in an axial direction, and each of the parts has at least one cutting element and/or guide element.

8. The cutting tool according to claim 1 , wherein the basic body extends starting from a coupling up to an end face on a free end in an axial direction, and the balance element only extends over a partial region of the basic body in an axial direction and terminates at a distance from the end face.

9. The cutting tool according to claim 1 , wherein the basic body extends starting from a coupling up to an end face on a free end in an axial direction, and a partial section of the balance element arranged in a region of the free end is releasably attached.

10. The cutting tool according to claim 1 , wherein the cutting tool is a boring bar for machining holes separated from each other in an axial direction by a set distance.

11. A method for machining a plurality of holes using a cutting tool according to claim 1 .

12. The method of claim 11 , wherein the cutting tool is a boring bar for machining holes separated from each other in an axial direction by a set distance.

13. The cutting tool according to claim 1 , wherein the parting plane is within 5° of the midplane.

14. The cutting tool according to claim 1 , wherein the parting plane is precisely parallel with the midplane.

Assignees

• Kennametal Inc

Inventors

• Hacker Michael
• Kunschir Sebastian

Classifications

• B23B2229/08

  Cutting edges of different lengths or at different axial positions · CPC title

• B23B2250/04

  Balancing rotating components · CPC title

• B23B35/00 Primary

  Methods for boring or drilling, or for working essentially requiring the use of boring or drilling machines; Use of auxiliary equipment in connection with such methods · CPC title

• B23B27/002

  with vibration damping means · CPC title

• B23B2229/04

  Guiding pads · CPC title