Patent · US Expired

Method for hardening ring-shaped grooves by means of laser beams

US6592690B1 · kind B1 · utility

3Cited by

2References

8Claims

0Family size

Assignee

Mahle GmbH · DE

Inventors

Michael Weis · Planegg, DE
Karl Pfeil · Darmstadt, DE

Key dates

Filing date	Oct 25, 2001
Grant date	Jul 15, 2003
Priority date	—
Expiry date	Oct 25, 2021

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC21D1/09
WIPO fieldMaterials, metallurgy
WIPO sectorChemistry

Abstract

A method for hardening the grooves of steel pistons of steel piston heads whereby hardening of the bottom of the grooves is avoided. The laser beam is directed onto the sides of the groove in an approximately tangential direction in relation to the outer diameter of the piston.

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