초록 ▼

An apparatus for constricting an end of a metallic tube (or worktube) to form an arcuate-walled portion that has an outer surface is provided. The apparatus comprises a means for rotating the tube on its axis, a movable means for heating an end portion of the tube, and a forming rolling means. The f

An apparatus for constricting an end of a metallic tube (or worktube) to form an arcuate-walled portion that has an outer surface is provided. The apparatus comprises a means for rotating the tube on its axis, a movable means for heating an end portion of the tube, and a forming rolling means. The forming rolling means includes a forming roller adapted for applying pressure on the end portion of the tube along successive lines of contact to constrict progressively the end of the tube. The movement of the forming rolling means is orchestrated with the movement of the means of heating. In a preferred embodiment, each line of contact has a substantially straight portion.

대표청구항 ▼

An apparatus for constricting an end of a metallic tube to form an arcuate-walled portion, the apparatus comprising: means for rotating the tube about its longitudinal axis; a forming roller mechanism including a forming roller adapted for applying pressure to an end portion of the tube, the forming

An apparatus for constricting an end of a metallic tube to form an arcuate-walled portion, the apparatus comprising: means for rotating the tube about its longitudinal axis; a forming roller mechanism including a forming roller adapted for applying pressure to an end portion of the tube, the forming roller mechanism being constructed and arranged to move the forming roller through a succession of angularly-spaced paths along the end portion of the tube, at least some of the paths having straight portions that are generally tangent to the end portion of the tube; and a heating mechanism including an inductive heating element adapted for providing heat to the end portion of the tube.