Patent · US Expired

Method of producing accurately scaled, well-defined surfaces of work pieces from carbonaceous cast iron with tribologic properties

US4543170A · kind A · utility

0Cited by

3References

4Claims

0Family size

Assignee

AUDI AG · DE

Inventors

Klaus Heck · Hohenacker, DE
Horst Lindner · Ingolstadt, DE

Key dates

Filing date	Apr 29, 1983
Grant date	Sep 24, 1985
Priority date	—
Expiry date	Apr 29, 2003

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB23P15/10
WIPO fieldMachine tools
WIPO sectorMechanical engineering

Abstract

The invention relates to a process for producing accurately scaled, well-defined surfaces of workpieces made from carbonaceous cast iron and having tribologic properties, more particularly of cylinders or internal combustion engines, said surfaces being subjected to at least two operating cycles consisting of an electrochemical and a subsequent mechanical removal. To obtain a constant surface quality, at least the last operating cycle is carried out in a specified ratio between the electrochemical and the mechanical removal and this is a fixed removal ratio. Preferably, a metal bearing plateau percentage of 40 to 65% of the surface is produced with the last operating cycle.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.