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. 29, 2025
Filed:
Mar. 27, 2020
Hitachi Astemo, Ltd., Hitachinaka, JP;
Kenichi Gunji, Hitachinaka, JP;
Masato Higuma, Hitachinaka, JP;
Ryohei Matsutake, Hitachinaka, JP;
Yuta Yanagisawa, Hitachinaka, JP;
Yuki Sugiyama, Hitachinaka, JP;
Hitachi Astemo, Ltd., Hitachinaka, JP;
Abstract
An object of the present invention is to provide a working method of an orifice, which has excellent working accuracy and high productivity in order to work an inclination portion (tapered portion) on the entire circumference of an inner wall of an orifice. Therefore, a working method of an orifice includes a first step of forming an orifice holein an orifice forming member, a second step of pressing a downstream end surface of the orifice forming member in which the orifice holeopens, in a direction toward an upstream side of the orifice holeby a punchhaving a cutting blade portionlarger than a cross section of the orifice hole. The second step causes a material of the orifice forming member to flow from an entire circumference at the downstream end portion of the orifice holeto an inside of the orifice holeto form a cross-sectional area reduction portionin which a cross-sectional area of the orifice holeis reduced from an upstream side to a downstream side.