Internal milling cutter

Patent metadata

Field	Value
Publication number	US-9597739-B2
Application number	US-201414165910-A
Country	US
Kind code	B2
Filing date	Jan 28, 2014
Priority date	Feb 11, 2013
Publication date	Mar 21, 2017
Grant date	Mar 21, 2017

Abstract

An internal milling cutter for producing a recess terminating in a radius in a workpiece, in particular for milling a crankshaft, comprises a tool holder having interchangeable cutting inserts detachably attached thereto. For the production of the radius, a plurality of first interchangeable cutting inserts are provided, which are arranged one after another in the direction of cut and have cutting edges which produce complementary portions of the radius, wherein the first interchangeable cutting inserts for producing the radius are identically configured.

First claim

What is claimed is:

1. An internal milling cutter for producing in a workpiece a recess terminating in a radius, the milling cutter comprising a tool holder and a plurality of first interchangeable cutting inserts detachably attached thereto, wherein the plurality of first interchangeable cutting inserts are arranged one after another in the direction of cut having cutting edges which produce portions of the radius, wherein the plurality of first interchangeable cutting inserts are identical to each other, and wherein the plurality of first interchangeable cutting inserts are of disk-shaped configuration and are oriented with one end face substantially perpendicular to the direction of cut.

2. The internal milling cutter as claimed in claim 1 , wherein the radius is formed by two of the plurality of first interchangeable cutting inserts having cutting edges.

3. The internal milling cutter as claimed in claim 1 , wherein the plurality of first interchangeable cutting inserts have rounded and straight peripheral portions.

4. The internal milling cutter as claimed in claim 3 , wherein the rounded and straight peripheral portions alternate when coming into contact with the workpiece.

5. The internal milling cutter as claimed in claim 3 , wherein the tool holder is provided with at least one contact surface for the positioning and indexing of the straight peripheral portion of the plurality of first interchangeable cutting inserts.

6. The internal milling cutter as claimed in claim 3 , wherein the rounded portions have a curvature corresponding to the radius to be produced on the workpiece.

7. The internal milling cutter as claimed in claim 1 , further comprising a plurality of second interchangeable cutting inserts provided on the tool holder in order to cut portions of a recess which adjoin the radius into the workpiece, wherein the plurality of second interchangeable cutting inserts are identical to each other.

8. The internal milling cutter as claimed in claim 7 , wherein the portion of the recess adjoining the radius is produced only by the plurality of second interchangeable cutting inserts.

9. The internal milling cutter as claimed in claim 1 , wherein the plurality of first interchangeable cutting inserts are arranged along a periphery of the tool holder.

10. The internal milling cutter as claimed in claim 9 , wherein the plurality of first interchangeable cutting inserts are offset with respect to each other in the direction of cut.

11. The internal milling cutter as claimed in claim 1 , wherein the tool holder comprises a main body and a plurality of cassettes detachably fastened to the main body, and wherein at least one of the plurality of first interchangeable cutting inserts is fastened to a respective cassette.

12. The internal milling cutter as claimed in claim 1 , wherein each of the plurality of first interchangeable cutting inserts is fastened to a cassette that is detachably fastened to the tool holder.

13. An internal milling cutter for producing in a workpiece a recess terminating in a radius, the milling cutter comprising a tool holder and a plurality of first interchangeable cutting inserts detachably attached thereto, and a plurality of second interchangeable cutting inserts provided on the tool holder in order to cut portions of a recess which adjoin the radius into the workpiece, wherein the plurality of second interchangeable cutting inserts are identical to each other, wherein the plurality of first interchangeable cutting inserts are arranged one after another in the direction of cut having cutting edges which produce portions of the radius, wherein the plurality of first interchangeable cutting inserts are identical to each other, and wherein the plurality of first interchangeable cutting inserts are of disk-shaped configuration and are oriented with one end face substantially perpendicular to the direction of cut.

14. The internal milling cutter as claimed in claim 13 , wherein the radius is formed by two of the plurality of first interchangeable cutting inserts having cutting edges.

15. The internal milling cutter as claimed in claim 13 , wherein the plurality of first interchangeable cutting inserts have rounded and straight peripheral portions.

16. The internal milling cutter as claimed in claim 15 , wherein the rounded and straight peripheral portions alternate when coming into contact with the workpiece.

17. The internal milling cutter as claimed in claim 15 , wherein the tool holder is provided with at least one contact surface for the positioning and indexing of the straight peripheral portion of the plurality of first interchangeable cutting inserts.

18. The internal milling cutter as claimed in claim 15 , wherein the rounded portions have a curvature corresponding to the radius to be produced on the workpiece.

19. The internal milling cutter as claimed in claim 13 , wherein the plurality of first interchangeable cutting inserts are arranged along a periphery of the tool holder.

20. The internal milling cutter as claimed in claim 19 , wherein the plurality of first interchangeable cutting inserts are offset with respect to each other in the direction of cut.

21. The internal milling cutter as claimed in claim 13 , wherein the portion of the recess adjoining the radius is produced only by the plurality of second interchangeable cutting inserts.

22. The internal milling cutter as claimed in claim 13 , wherein the tool holder comprises a main body and a plurality of cassettes detachably fastened to the main body, and wherein at least one of the plurality of first changeable cutting inserts is fastened to a respective cassette.

23. An internal milling cutter for producing in a workpiece a recess terminating in a radius, the milling cutter comprising a tool holder and a plurality of first interchangeable cutting inserts detachably attached thereto, and a plurality of second interchangeable cutting inserts provided on the tool holder in order to cut portions of a recess which adjoin the radius into the workpiece, wherein the plurality of second interchangeable cutting inserts are arranged one after another in the direction of cut having cutting edges which produce portions of the radius, wherein the plurality of first interchangeable cutting inserts are identical to each other, wherein the plurality of first interchangeable cutting inserts have rounded and straight peripheral portions, wherein the plurality of first interchangeable cutting inserts each has alternately rounded and straight peripheral portions, and wherein the straight peripheral portions are oriented such that they do not come into contact with the workpiece.

Assignees

• Kennametal Inc

Inventors

• Heinloth Markus
• Baer Jüergen Thomas
• Gruenler Jan

Classifications

• B23C3/06

  Milling crankshafts · CPC title

• B23C5/202 Primary

  Plate-like cutting inserts with special form (special form related to securing of the insert B23C5/22) · CPC title

• Y10T407/1906

  including holder [i.e., head] having seat for inserted tool · CPC title

• B23C5/207 Primary

  Operations & Transport · mapped topic

• B23C2200/0483

  rounded · CPC title