초록

To reduce the length of a tube thickened by swaging and to provide acceptable efficiency in use of material and vessel length for a high performance pressure vessel, the tube is locally corrugated, then conventionally swaged and subsequently pressurized to remove the corrugations.

대표청구항 ▼

A method for localized boss thickening by cold swaging a hollow surface of revolution having an end which will bedome a boss and an end region, said method comprising the steps of corrugating the area of said hollow surface of revolution, which after swaging is the transition, which is usually conic

A method for localized boss thickening by cold swaging a hollow surface of revolution having an end which will bedome a boss and an end region, said method comprising the steps of corrugating the area of said hollow surface of revolution, which after swaging is the transition, which is usually conical or ogival, from adjacent the boss to the end of the swaged area, to form a corrugated shape which is initially a figure eight in cross-section while the end region to be reduced in diameter and thickened is maintained circular in cross-section; cold swaging the circular end of said hollow surface of revolution to a small diameter, thickened so that it may function as the boss end of a pressure vessel; simultaneously swaging the corrugated region from said figure eight cross-section to a smaller envelope substantially kidney shape cross-section whereby it remains unthickened but bent to a smaller diameter; and subsequently pressurizing to remove most of the corrugations and to cause the region of the deformed hollow surface of revolution having the corrugations removed to revert to its original diameter.