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Finishing of sliding surfaces with geometrically defined cutting edges

Presentation held at "Friction, Wear and Wear Protection", Symposium "TriboMan-Session", 26.- 28. Oct 2011, Karlsruhe
 
: Schubert, Andreas; Schmidt, Torsten; Schneider, Jörg

:
presentation urn:nbn:de:0011-n-1900966 (5.7 MByte PDF)
MD5 Fingerprint: 8be6ab93a6ed91f0e48dd23e7d31cd2b
Created on: 13.12.2011


2011, 24 Folien
Friction, Wear and Wear Protection Symposium <2011, Karlsruhe>
English
Presentation, Electronic Publication
Fraunhofer IWU ()
friction reduction; sliding surfaces; preconditioning of the finished surface; finishing with geometrically defined cutting edges; third body concept; structure by rolling

Abstract
The rising importance of friction reduction of parts and components, especially in the power train, leads to increasing demands on the finishing of sliding surfaces. In order to meet these new requirements, new methods have to be applied. A new approach for the surface finishing is, to generate an approximated run-in condition to the surface by the finishing process in order to obtain lower initial friction and a shorter run-in period. This requires specific surface properties to ensure the proper functioning. This preconditioning of the finished surface is achieved in a precision boring process by modified cutting edge geometry. The investigations were carried out on a hypoeutectic AlSi alloy, which serves as a basis for a cylinder surface of a combustion engine. During the investigation it was found that the grain size in the surface layer of hypoeutectic AlSi alloys can be reduced by machining with specific modified cutting edge tools. The finished microstructure of the AlSi alloys has high potential for reducing the running-in time of engine components. First Tribological investigations on the finished surfaces were carried out in a piston-ring-cylinder liner simulator. These first investigations have shown a reduction of the friction coefficient compared to finished surfaces by conventional cutting inserts.

: http://publica.fraunhofer.de/documents/N-190096.html