Title:
【発明の名称】ハイドロフォーム加工装置
Document Type and Number:
Japanese Patent JP3007883
Kind Code:
B1
Abstract:
PROBLEM TO BE SOLVED: To avoid a crack due to thinning of a bulged part and to precisely form a bulged part by applying an internal pressure and a axial compression load in the flow direction of a tube stock having a round cross section and forming a roughly flat part to a die face to the part changing from the axial direction of the tube stock to the bulging direction. SOLUTION: A forming die 1 is formed with upper/lower dies 2, 3 split in the axial direction, the upper die 2 is subjected to parting/clamping in the A-B direction. Semicircle shaped die holes 4, 5 are formed in the upper/lower dies 2, 3, a cylindrical hole 7 having the diameter roughly equal to an outer diameter of a tube stock 6 is formed by working with alignment of both die holes 4, 5. A bulged part forming die hole 8 is formed as branched in the direction orthogonal to the axial center of the cylindrical die hole 7. A pressurized fluid is pressure supplied to the cylindrical die hole 7 from pressurized fluid nozzles 11, 12. A roughly flat part 13 is formed at the part where a flow direction of the tube stock 6 is changed from the axial direction to the direction of the bulged part forming die hole 8. The roughly flat part 13 is a roughly triangular, its bottom side is a straight line parallel to the tube stock 6 and its apex is positioned at a face of the bulged part forming die hole 8.
Inventors:
Kuniaki Aoyama
Hamaji Fellowship
Hamaji Fellowship
Application Number:
JP25795598A
Publication Date:
February 07, 2000
Filing Date:
September 11, 1998
Export Citation:
Assignee:
Sango Co., Ltd.
International Classes:
B21D26/037; B21D26/041; B21D26/043; B21D26/047; (IPC1-7): B21D26/02
Domestic Patent References:
| JP367451B2 | ||||
| JP5245303B2 |
Attorney, Agent or Firm:
Yoshimichi Hasegawa