The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 05, 1984
Filed:
Jul. 06, 1981
Vaino Sailas, Vaajakoski, FI;
Valmet Oy, , FI;
Abstract
A method for manufacturing hard-surfaced cast iron articles, such as rolls for use in the steel industry or paper calendering rolls, includes the steps of casting the article in a manner such that upon cooling the crystal structure of the article is that of grey cast iron and remelting the surface to be treated by directing at least one electron beam onto a zone of the surface to be treated and cooling the remelting zones in a rapid manner so that a hard surface is obtained. The electron beam may be directed onto the zone of the surface to be treated in a punctiform and/or lineal manner, in one or a plurality of partial steps, and in a continuous or stepwise manner. The apparatus of the invention includes at least one electron gun, apparatus for mounting the electron gun and the article relative to each other such that the electron gun can direct an electron beam onto the zone of the surface to be treated to remelt the same and apparatus for displacing the electron gun and article relative to each other.