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:
Oct. 03, 1995
Filed:
Mar. 23, 1994
Aida Engineering, Ltd., Kanagawa, JP;
Abstract
A plastic working method for making a holed metal part. A holed blank with a through hole is placed at the center in a die member which has a die and a container continuing to the die. The die is pushed toward a punch, inserting into the through hole a first portion of a mandrel which has cross sections with at least two different cross-sectional areas. The blank is compressed by a counter punch fitting with the container and a punch pressing the die end face of the die member toward the counter punch to cause the blank plasticly to flow into a space formed between the die hole of the die and the first portion of the mandrel and while applying a compressive force to the blank by the punch and the counter punch, pulling out the first portion of the mandrel out of the blank through hole while inserting a further portion of the mandrel into the through hole so as plastically to flow the blank into a gap between the first portion of the mandrel and the through hole. Other embodiments of the method are also disclosed.