Method of machining a motion-supporting surface of a cylinder of an internal combustion engine

Patent metadata

Field	Value
Publication number	US-10316789-B2
Application number	US-201414903705-A
Country	US
Kind code	B2
Filing date	Jul 3, 2014
Priority date	Jul 12, 2013
Publication date	Jun 11, 2019
Grant date	Jun 11, 2019

Abstract

A method for working a wall of a cylinder of an internal combustion engine, in which peripheral grooves are machined into the wall, wherein at least one annular saw blade, which is provided on a circumference with a multiplicity of cutting teeth, is used for introducing the grooves, wherein the saw blade is moved so as to rotate about its longitudinal axis and on an annular path. A subsequent forming operation on the lands that are formed between neighboring grooves causes the formation of undercuts that can improve the connection of the wall of the cylinder to a subsequently applied coating layer.

First claim

Thus, having described the invention, what is claimed is:

1. A method of machining a wall of a cylinder of an internal combustion engine comprising:
forming grooves, extending around in a loop, into the wall by a stock-removing process;
introducing at least one annular saw-blade, which is provided at its circumference with a plurality of cutting teeth; and
moving the saw-blade in rotation on its longitudinal axis and along an annular path, wherein the annular path is not circular.

2. The method of claim 1 , wherein a width of the cutting teeth corresponds to an intended width of the grooves.

3. The method of claim 2 , including using a plurality of saw-blades arranged in parallel.

4. The method of claim 1 , including using a plurality of saw-blades arranged in parallel.

5. The method of claim 4 , wherein a distance between adjacent saw-blades is a multiple of a width of lands formed between the grooves in the final state of the wall.

6. The method of claim 5 , wherein the grooves are introduced in at least two passes, with non-circular annular paths along which the saw-blade is moved in the two passes not being identical.

7. The method of claim 6 including bevelling or laterally radiusing the cutting teeth.

8. The method of claim 7 including reshaping the lands formed between the grooves to form undercuts.

9. The method of claim 8 , wherein the lands are reshaped by roller burnishing.

10. The method of claim 9 , wherein after forming the grooves, including a subsequent step of coating the wall.

11. The method of claim 1 , wherein the grooves are formed in at least two passes, with non-circular annular paths along which the saw-blade is moved in the two passes not being identical.

12. The method of claim 11 , wherein the annular path is stellate.

13. The method of claim 1 , wherein the annular path is stellate.

14. The method of claim 1 including bevelling or laterally radiusing the cutting teeth.

15. The method of claim 1 including reshaping lands formed between the grooves to form undercuts.

16. The method of claim 15 , wherein the lands are reshaped by roller burnishing.

17. The method of claim 1 , wherein after forming the grooves, including a subsequent step of coating the wall.

Assignees

• Bayerische Motoren Werke Ag
• Univ Muenchen Tech
• Hoffmann Gmbh Qualitaetswerkzeuge
• Technishe Univ Muenchen

Inventors

• Hahn Karlheinz
• Wagener Wolfram
• Woisetschlaeger Patrick

Classifications

• B23C2210/244

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

• B23D45/003

  for particular purposes · CPC title

• B23C2220/36

  Production of grooves · CPC title

• B23C5/08

  Disc-type cutters · CPC title

• B23C2215/242

  Combustion chambers · CPC title