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

Patent metadata

Field	Value
Publication number	US-2016169149-A1
Application number	US-201414903705-A
Country	US
Kind code	A1
Filing date	Jul 3, 2014
Priority date	Jul 12, 2013
Publication date	Jun 16, 2016
Grant date	—

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 in which grooves extending around in a loop are introduced into the wall by a stock-removing process, such that to introduce the grooves, at least one annular saw-blade is used which is provided at its circumference with a plurality of cutting teeth, the saw-blade being moved in rotation on its longitudinal axis and along an annular path.

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

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

4 . The method of claim 3 , wherein the distance between adjacent saw-blades is a multiple of the width of lands formed between the grooves in the final state of the wall.

5 . The method of claim 1 wherein the annular path is not circular.

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

7 . The method of claim 5 , wherein the annular path is stellate.

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

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

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

11 . The method of claim 1 including subsequently coating the walls.

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

13 . The method of claim 4 wherein the annular path is not circular.

14 . The method of claim 13 , wherein the grooves are introduced in at least two passes, with the non-circular annular paths along which the saw-blade is moved in the two passes not being identical.

15 . The method of claim 6 , wherein the annular path is stellate.

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

17 . The method of claim 16 including reshaping the lands formed between the grooves to form undercuts.

18 . The method of claim 17 , wherein the lands are reshaped by roller burnishing.

19 . The method of claim 18 including subsequently coating the wall.

Assignees

• Hahn Karlheinz
• Bayerische Motoren Werke Ag
• Univ Muenchen Tech

Inventors

• Hahn Karlheinz
• Wagener Wolfram
• Woisetschlaeger Patrick

Classifications

• B23C3/34

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

• B23C2215/242

  Combustion chambers · CPC title

• F02F1/18 Primary

  Other cylinders · CPC title

• B23C2210/244

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

• C23C4/02

  Pretreatment of the material to be coated, e.g. for coating on selected surface areas · CPC title