Roughening tool and method for roughening a cylindrical surface

Patent metadata

Field	Value
Publication number	US-11865628-B2
Application number	US-201916287080-A
Country	US
Kind code	B2
Filing date	Feb 27, 2019
Priority date	Aug 31, 2016
Publication date	Jan 9, 2024
Grant date	Jan 9, 2024

Abstract

A roughening tool for roughening the cylindrical surface of a bore in a particular metallic workpiece, e.g. the piston running surface of a cylinder bore or cylinder liner in an internal combustion engine, by generating a defined microstructure of a plurality of circumferentially spaced apart circumferential microgrooves. The roughening tool has a tool main body which can be driven in rotation about an axis of rotation and a multiplicity of circumferentially cutting cutting tools arranged at a defined axial distance from one another on the tool main body. According to the invention, the cutting tools are each formed from a disc milling cutter and each disc milling cutter has at least one cutting element with a multiplicity of cutting teeth arranged at an axial distance from one another. In addition, a method for roughening a cylindrical surface.

First claim

The invention claimed is:

1. A roughening tool for roughening the cylindrical surface of a bore in a workpiece, by producing a defined microstructure that is composed of a plurality of microgrooves extending circumferentially at an axial distance from one another, comprising
a tool base body, which is capable of being driven so as to rotate about a rotational axis, and
a plurality of cutting tools, comprising at least a first cutting tool and a second cutting tool, each cutting tool is a discrete disk,
each cutting tool comprising a plurality of cutting elements, each cutting element comprising a plurality of cutting teeth that are arranged at an axial distance from one another, each cutting element of the first cutting tool having an identical cutting tooth profile, each cutting element of the first cutting tool having a first cutting tooth profile, each cutting element of the second cutting tool having a second cutting tooth profile, the first cutting tooth profile is different from the second cutting tooth profile, wherein each cutting element profile is the entirety of the cutting teeth in a plan view of a rake face of a respective cutting element of the plurality of cutting elements,
each cutting tool comprising a respective central recess through which the tool base body extends, an exterior of the tool base body and the central recess of the first cutting tool are shaped such that the first cutting tool is capable of being positioned in at least first and second rotational positions relative to the tool base body, the first rotational position differing from the second rotational position, wherein:
with the first cutting tool in the first rotational position, the tool base body would not prevent the first cutting tool from being slid along the rotational axis relative to the tool base body, and the tool base body prevents the first cutting tool from rotating about the rotational axis relative to the tool base body, and
with the first cutting tool in the second rotational position, the tool base body would not prevent the first cutting tool from being slid along the rotational axis relative to the tool base body, and the tool base body prevents the first cutting tool from rotating about the rotational axis relative to the tool base body.

2. The roughening tool according to claim 1 , wherein:
for each cutting tool, each of the cutting elements are arranged at identical angular distances from one another in a circumferential direction.

3. The roughening tool according to claim 1 , wherein each cutting tooth of the plurality of cutting teeth has a rectangular profile, which is defined by a predetermined length and height.

4. The roughening tool according to claim 3 , wherein the predetermined length lies in the range between 200 and 400 μm and the predetermined height lies in the range between 60 and 200 μm.

5. The roughening tool according to claim 1 , wherein the axial distance between each pair of successive teeth lies in the range between 100 and 200 μm.

6. The roughening tool according to claim 1 , wherein the cutting tools are exchangeably fastened on the tool base body.

7. The roughening tool according to claim 1 , wherein the cutting tools are fastened on the tool base body in the rotating direction by means of a feather key.

8. The roughening tool according to claim 1 , wherein the cutting tools are fastened on the tool base body in the axial direction by means of a clamping screw.

9. The roughening tool according to claim 1 , wherein the distance between two axially successive cutting tools is defined by a spacer arranged between the cutting tools.

10. The roughening tool according to claim 1 , wherein the distance between two successive cutting tools is defined in such a way that cutting profiles of the cutting elements of two cutting tools overlap by a defined dimension in a circumferential direction.

11. The roughening tool according to claim 1 , wherein two axially successive cutting tools respectively are rotated relative to one another about the rotational axis in such a way that the cutting elements of the two axially successive cutting tools are arranged at a defined angular distance from one another.

12. The roughening tool according to claim 1 , wherein two axially successive cutting tools respectively are rotated relative to one another about the rotational axis in such a way that the cutting elements are arranged helically.

13. The roughening tool according to claim 1 , wherein the roughening tool further comprises a shank section, which forms an axial extension of the tool base body and serves for connecting the roughening tool to a machine tool system.

14. The roughening tool according to claim 1 , wherein the roughening tool further comprises an internal cooling lubricant supply system for supplying the cutting elements with cooling lubricant.

15. The roughening tool according to claim 1 , wherein a cutting section of the roughening tool, which is formed by the plurality of cutting tools, has a length that is greater than or equal to the length of the cylindrical surface to be machined.

16. The roughening tool according to claim 1 , wherein the plurality of cutting tools includes a plurality of the first cutting tool, the plurality of the first cutting tool is axially arranged between the second cutting tool and an additional cutting tool, the second cutting tool and the additional cutting tool each have a greater profile width, measured parallel to the rotation axis, than each of the plurality of the first cutting tool.

17. The roughening tool according to claim 1 , wherein the cylindrical surface is a piston bearing surface of a cylinder bore or a cylinder liner in an internal combustion engine.

18. The roughening tool according to claim 1 , wherein the complementary shapes of each cutting tool and the respective exterior portion of the tool base body comprise a feather key.

19. The roughening tool according to claim 1 , wherein the complementary shapes of each cutting tool and the respective exterior portion of the tool base body each comprise a polygon cross-sectional shape.

20. The roughening tool according to claim 1 , wherein the complementary shapes of each cutting tool and the respective exterior portion of the tool base body comprise a splined hub in each central recess of each cutting tool, and a splined shaft on the exterior of the tool base body.

Assignees

• Guehring Kg

Inventors

• Teusch Bruno

Classifications

• B23C3/34 Primary

  Milling grooves of other forms, e.g. circumferential · CPC title

• B23C2210/244

  Milling cutters comprised of disc-shaped modules or multiple disc-like cutters · CPC title

• B23C2215/242

  Combustion chambers · CPC title

• B23C2220/36

  Production of grooves · CPC title

• B23C2220/60

  Roughing · CPC title