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. 19, 2007
Filed:
Nov. 01, 2001
Aribert Schwager, Asperg, DE;
Fritz Bley, Markersbach, DE;
Manfred Kammerer, Asperg, DE;
Klaus Siegert, Sindelfingen, DE;
Aribert Schwager, Asperg, DE;
Fritz Bley, Markersbach, DE;
Manfred Kammerer, Asperg, DE;
Klaus Siegert, Sindelfingen, DE;
Forschungsgesellschaft Umformtechnik mbH, Stuttgart, DE;
Abstract
The invention relates to a method and an apparatus for producing a workpiece with internal toothing, especially an internal geared wheel, by using a cup shaped preform (N) with a substantially cylindrical side wall (N) and a mandrel () with an external profile () according to the internal toothing to be produced, as well as with a forming tool which reduces the outside diameter of the cylindrical side wall during an advancing movement, as a result of which the material of the cylinder wall region flows into the external profile () of the mandrel (). In accordance with the invention, the forming tool is configured as a drawing ring () ensuring the ironing of the cylinder wall region (N) during an advancing movement and that two tool elements act upon the preform (N) during the ironing, which tool elements produce axial compressive stresses in the cylinder wall region (N) of the preform.