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:
Mar. 26, 1991
Filed:
Sep. 09, 1988
Aida Engineering, Ltd., Kanagawa, JP;
Abstract
A method and apparatus for manufacturing a product such as a constant velocity joint having a recess whose opening has a lesser diameter than its interior, by ironing a workpiece supplied to working parts of punches which workpiece is pre-formed into a hollow structure whose opening has an excess of metal required to be ironed. A group of punches are mounted in a loop around a punch guide for relative axial movement. The group of punches includes a set of first punches and a set of second punches, disposed alternately. Each punch has a working part at an upper end thereof and the working parts are closely assembled in a closed loop at the time of the forming process. Each punch is formed with a groove in a side which is slidable along the punch guide. The grooves in the first punches are different in length from those in the second punches. After the workpiece is supplied to the working parts of the punches and ironed to narrow the diameter of the opening relative to the interior of the recess, the punches are moved upwardly relative to the punch guide to narrow firstly the outer diameter of the working parts of the set of first punches and secondly the outer diameter of the working parts of the set of second punches and pull up the formed workpiece from the punches.