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:
Apr. 16, 1991
Filed:
Aug. 30, 1990
Miroslan Podhorsky, Elisabethstrasse, DE;
Balckeurr Aktiengesellschaft, Ratingen, DE;
Abstract
A method of producing a cam shaft or a similar member that has a core pipe upon which are secured, via expansion of the core pipe, components that are spaced from one another and have a precribed position on the core pipe, with the expansion of the core pipe being effected by introducing a hydraulic fluid into the core pipe. The surface of the components that are secured on the core pipe and are made of a ductile spheroidal graphite iron or sintered material, are subjected to a mechanical abrasion and are melted via a controlled laser beam in such a way as to first slightly reduce the adhesive pressure betewwn the components and the core pipe as a consequence of the melting of the surface layer, and subsequently, after hardening of the melted layer and due to temperature equalization in the components and the core pipe, to increase the adhesive pressure to a higher value. The melting results in a ledeburitic structure having an adequate depth.