|국가/구분||United States(US) Patent 등록|
|미국특허분류(USC)||72/85 ; 72/96 ; 72/370|
|발명자 / 주소|
|출원인 / 주소|
|인용정보||피인용 횟수 : 9 인용 특허 : 1|
A method of fabricating a tube having enlarged ends and made of material which can be strengthened by cold working comprises fabricating a pre-form having the overall configuration of the tube but with increased outside diameters and a decreased length. The pre-formed tube is cold forged or cold rolled over its entire length to reduce its outside diameter while maintaining its inside diameter substantially fixed. This elongates the tube and reduces its cross-sectional area. Cold working is continued until the final desired dimensions for the tube are rea...
A method for manufacturing a tube of constant inside diameter having at least one enlarged end and made of a material which is strengthened by cold working, comprising: fabricating a pre-formed tube of the material which has a body portion, at least one enlarged end portion and a transition taper between the at least one enlarged end and the body portion with initial outside diameter, wall thickness, inside diameter, length and cross-sectional area; inserting a mandrel into the inside diameter of the tube; and cold working the outside diameter of the pre...