Method for producing a surface-alloyed cylindrical, partially cylindrical or hollow cylindrical component and a device for carrying out said method

US6858262B2 · kind B2 · utility

Assignee

• VAW aluminium AG · DE

Inventors

• Alexander Fischer · Bad Homburg vor der Höhe, DE
• Joachim Kahn · Ehringshausen, DE
• Franz Josef Feikus · Bonn, DE

Key dates

• Filing date: Feb 21, 2001
• Grant date: Feb 22, 2005
• Expiry date: Feb 21, 2021

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B23K2103/15
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

Abstract

The invention relates to a method for manufacturing a surface-alloyed cylindrical, partly cylindrical or hollow cylindrical structural member where in the zone of incidence of the energy beam there is formed a locally bounded melting bath with a heating and melting front, a solution zone and a solidification front. At the side of the energy beam the hard material powder is deposited via a conveyor device in the direction of gravity and is supplied co-ordinated with the feed movement of the workpiece in a width which corresponds to the width of the linear focus and a layer height of 0.3-3 mm is thereby produced. The hard-material powder supplied to the workpiece surface in the heating front of the melting bath is heated by an energy beam at a wavelength of 780-940 nm and in contact with the liquefied matrix alloy the powder is immediately dissolved in the melting bath. Convection is produced in the solution zone by the energy beam having a specific power of at least 104 W/cm2, so that the homogenization process in the melting zone is accelerated, where the linear focus acts on the solution zone until the hard material powder is uniformly distributed in the melting bath. In front of …