초록 ▼

A method of making mechanical tube joints in whichfirst and second metal working operations, applied through a ferrule installed in a tube end in a header plate, effect initially a tight fit of the tube end in the plate followed by a sealing contact. The method proposes a machine operation in which

A method of making mechanical tube joints in whichfirst and second metal working operations, applied through a ferrule installed in a tube end in a header plate, effect initially a tight fit of the tube end in the plate followed by a sealing contact. The method proposes a machine operation in which multiple header plates, each providing multiple tube positions, are supported for indexing movements relative to a bank of tools for performing the second of the first and second metal working functions, complete sealed joints of all tube positions in all plates being effected in a single series of automatic operations.

대표청구항 ▼

A method of establishing by mechanical means a leak tight joint between a tube and shell type heat exchanger, including: a. providing a header plate with a through tube accommodating hole therein; b. providing a tube made of a deformable metallic material and having an outside diameter approximately

A method of establishing by mechanical means a leak tight joint between a tube and shell type heat exchanger, including: a. providing a header plate with a through tube accommodating hole therein; b. providing a tube made of a deformable metallic material and having an outside diameter approximately the same as the hole diameter in the header plate; c. inserting an end of said tube into the hole in the header plate so that it is received therein with an extremity at or adjacent to an exterior face of said header plate; d. installing in an inserted tube end through said exterior face a metallic ferrule including a cylindrical body portion having an outside diameter approximately the same as the inside tube diameter and positioning said cylindrical body portion of said ferrule in said tube end in a longitudinal sense so that an outer end thereof substantially agrees with the extremity of said tube end; and e. in first and second metal working steps applied in axial thrusts directed reversely of one another effecting first an initial expansion of said ferrule to deform the surrounding tube end into close fitting contact with a header plate wall surface defining said through hole, and second a subsequent further expansion of said ferrule additionally to deform the tube end into sealing contact with said hole defining wall surface.