# US 10,309,447 B2 · Method for machining a surface of a metal component, and metal component

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- Number: US 10,309,447 B2
- Document ID: US10309447B2
- Status: Granted
- Kind: B2
- Application number: 15/468,686
- Filed: 2017-03-24
- Published: 2017-10-05
- Granted: 2019-06-04
- Earliest claimed: 2016-03-31
- Assignees: Dr. Ing. h.c. F. Porsche Aktiengesellschaft
- Applicants: Dr. Ing. h.c. F. Porsche Akteingesellschaft; Gehring Technologies GmbH
- Inventors: Peter Wels; Gerhard Flores
- Web page: https://patentgrep.com/patent/US10309447B2

## CPC

- F16C 7/023: {for piston engines, pumps or the like}
- B21D 53/84: other parts for engines, e.g. connecting-rods
- B23K 26/0626: {Energy control of the laser beam (B23K26/0622 takes precedence)}
- B23K 26/361: for deburring or mechanical trimming (B23K26/351 takes precedence)
- B23K 26/362: Laser etching
- F16C 33/12: Structural composition; Use of special materials or surface treatments, e.g. for rust-proofing
- F16C 33/14: Special methods of manufacture; Running-in
- F16H 53/025: {characterised by their construction, e.g. assembling or manufacturing features}
- B23K 2101/006: {Vehicles}
- B23K 2103/04: Steel {or steel} alloys
- B23K 2103/14: Titanium or alloys thereof
- F16C 2204/42: Alloys based on titanium
- F16C 2204/60: Ferrous alloys, e.g. steel alloys
- F16C 2220/60: by removing material, e.g. machining
- F16C 2223/02: Mechanical treatment, e.g. finishing
- F16C 2240/42: Groove sizes
- F16C: SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- B21D: WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL (working or processing of wire B21F)
- B23K: SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- F16H: GEARING

## Abstract

A method for machining a surface of a metal component, in particular a connecting rod or a cam for a motor vehicle, including the following steps: providing a metal component which has a surface to be machined; premachining the surface to be machined; structuring the premachined surface by a laser beam in such a way that elevations but no depressions are formed as laser structures on the premachined surface with respect to the level thereof.

## Claims

### Claim 1

A method for machining a surface of a metal component, comprising:
machining a surface on a metal component and forming rectilinear structures in a circumferential direction, and
structuring the machined surface using a laser beam, wherein the machined surface is laser-structured in such a way that elevations but no depressions are formed as laser structures with respect to a level of said surface, and the elevations are arranged in a row that is orthogonal to the rectilinear structures.

### Claim 2 (depends on 1)

The method as claimed claim 1, wherein the surface is an inner surface of an aperture in the metal component, wherein the laser beam is guided in a direction orthogonal to the circumferential direction of the inner surface.

### Claim 3 (depends on 1)

The method as claimed in claim 1, wherein the laser beam is operated in a pulsed manner along at least one machining track over the surface.

### Claim 4 (depends on 3)

The method as claimed in claim 3, wherein the elevations which are formed within a machining track are formed in an overlapping manner on the surface and have an overlap of greater than or equal to 60 percent.

### Claim 5 (depends on 3)

The method as claimed in claim 3, wherein the elevations are generated in a plurality of machining tracks of respectively overlapping elevations on the surface, wherein the machining tracks are spaced apart from one another free of overlap and have a spacing of at least 50 percent of a track width of the machining tracks.

### Claim 6 (depends on 3)

The method as claimed in claim 3, wherein the metal component is a steel component, the machined steel surface of which is laser-structured with an average beam power of 9±0.5 watt.

### Claim 7 (depends on 3)

The method as claimed in claim 3, wherein the metal component is a titanium component, the machined titanium surface of which is laser-structured with an average beam power of 8±0.5 watt.

### Claim 8 (depends on 1)

The method as claimed in claim 1, wherein the elevations have a round shape.

### Claim 9 (depends on 1)

The method as claimed in claim 1, wherein the elevations have a width of less than 100 μm.

### Claim 10 (depends on 1)

The method as claimed in claim 1, wherein the elevations lave a height of less than 20 μm.

### Claim 11 (depends on 1)

The method as claimed in claim 1, wherein the surface is an inner circumferential surface and the machining on the surface generates a surface structure which is oriented in the circumferential direction of the inner circumferential surface.

### Claim 12 (depends on 11)

The method as claimed in claim 11, wherein the inner circumferential surface is laser-structured in a plurality of spaced-apart angular sections.

### Claim 13 (depends on 1)

The method as claimed in claim 1, wherein the metal component is a connecting rod for a motor vehicle.

### Claim 14 (depends on 1)

The method as claimed in claim 1, wherein a height (R) of the rectilinear structures is greater than a height (h) of the elevations.

### Claim 15 (depends on 1)

The method as claimed in claim 1, wherein a plurality of elevations are disposed between adjacent rectilinear structures.

### Claim 16 (depends on 1)

The method as claimed in claim 1, wherein the elevations are arranged in a plurality of rows and the rectilinear structures are also arranged in a plurality of rows, and the plurality of rows of elevations are orthogonal to the plurality of rows of rectilinear structures.