Crank case`s cylinder bearing surface testing method, involves using eddy current technique on silicon-particle-free areas of surface, and carrying out differential and absolute measurements of conductivity with eddy current technique

• Main Authors: DUMM, ANTON, WAGENER, WOLFRAM, WOLF, JOHANN, FENT, ANDREAS
• Format: Patent
• Language: English; German
• Published: 26.07.2007
• Subjects: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; PHYSICS; TESTING

The method involves using an eddy current technique on silicon-particle-free areas of a cylinder bearing surface (1) of a crank case (2) for testing the bearing surface (1). A rotor (3) is provided with an induction coil (6) adjacent to the cylinder bearing surface for eddy current generation. The cylinder bearing surface is made of a hypereutectic aluminum-silicon alloy. A differential measurement and an absolute measurement of an electrical conductivity are carried out with the eddy current technique. An independent claim is also included for a device for executing a method for non-destructive testing of a cylinder bearing surface of a crank case of a reciprocating internal combustion engine. Zur zerstörungsfreien Prüfung der Zylinderlauffläche (1), die aus einer übereutektischen Aluminium-Silizium-Legierung hergestellt ist, auf siliziumpartikelfreie Bereiche (7) wird das Wirbelstrom-Verfahren angewendet.