Method of manufacturing connection member
AssigneeAisin Takaoka Co., Ltd.
InventorToru KOJIMA
Life of this patent
Estimating the term…
Abstract
After an annular plate is blanked from a metal flat plate in a blanking step, an inner peripheral portion of the annular plate is deformed upward in a burring step. As a result, a hat-shaped intermediate product having an upstanding tubular portion and an annular plate portion is formed. After that, an outer peripheral portion of the annular plate portion is folded step by step toward an inner peripheral side of the annular plate portion. As a result, a folded portion composed of a first folded portion and a second folded portion is formed, whereby a connection portion having a second flange portion is formed.
Claims5
A method of manufacturing a connection member used for connecting two tubes, internal flow passages of the tubes communicating with each other, each tubes have a flange, the two tubes are connected together by clamping the flanges, the connection member has a tube body and a flange, and is provided in one or both of the tubes, the flange of the connecting member is the flange of the tube provided with the connecting member,
- the method comprising:
- a blanking step of blanking a seamless annular plate from a flat plate;
- a burring step of performing burring on the annular plate blanked in the blanking step to form an annular plate portion and the body rising from an inner periphery of the annular plate portion;
- and
- a flange forming step of forming the flange including at least one annular folded portion by folding the annular plate portion from an outer peripheral side of the annular plate portion toward an inner peripheral side of the annular plate portion.
Dependencies are inferred from the claim text.