|국가/구분||United States(US) Patent 등록|
|국제특허분류(IPC7판)||B21B-015/00 B21D-022/00 B64D-033/02 B64D-033/00 F02B-027/00|
|미국특허분류(USC)||072/068; 072/083; 072/348; 072/379.6; 244/053.B; 137/017.1|
|발명자 / 주소|
|출원인 / 주소|
|대리인 / 주소||
|인용정보||피인용 횟수 : 14 인용 특허 : 7|
A method of manufacturing an elliptic deep-drawn product including a first step of providing an intermediate product and a second step of providing an end product. In the first step, a rotary forming die is used to form in a blank a substantially round formed portion of a U-shaped cross-section. In the second step, the formed portion is deformed at its semicircular portion by press working to form an elliptic portion, being formed into a final shape.
What is claimed is: 1. A method of manufacturing an elliptic deep-drawn product, comprising: a first series of steps of providing an intermediate product, the steps including placing a blank on a spinning forming die, pressing the blank onto the forming die with a spinning bar, and forming a substantially round formed portion of a U-shaped cross-section; and a second series of steps of providing an end product, the steps including placing the intermediate product in a press working die, and causing deformation with the press working die in a semicircle...