Metal deforming – By tool-couple pressing together adjacent surface portions... – To form helically-seamed tube
Patent
1977-01-05
1978-01-31
Combs, E. M.
Metal deforming
By tool-couple pressing together adjacent surface portions...
To form helically-seamed tube
B21C 3712
Patent
active
040708861
ABSTRACT:
An improved apparatus for continuously forming spirally corrugated metal pipe from an elongated sheet of metal which is first impressed with longitudinal corrugations in a corrugating device and the spiralled into a pipe in a three roll forming device, each roll of which is composed of a plurality of individual rollers. Each individual roller is mounted for rotation about its axis in an individual roller yoke, with each of the roller yokes of each roll being in constant abutment, but with adjacent roller yokes being uninterconnected. Individual roller yokes of each roll are positioned along a guide, with each yoke being both freely displaceable along the guide along a horizontal path generally parallel to the axis of the formed pipe, and also pivotable about a vertical center axis. One of the rolls, termed herein a horn roll, is situated to contact the inner wall of the pipe as it is formed, while the other two rolls, respectively termed the lead and buttress rolls, are situated to contact the outer wall of the pipe. A rigid frame member is attached to the corrugating device, extending from the corrugating device into the three roll forming device in contact with either end of each of the lead and buttress rolls. The buttress roll is the farthest downstream of the three rolls and is adjustable on an angle to the vertical in order to vary the diameter of successive helical convolutions of the metal sheet, therefore varying the diameter of the pipe produced. A downwardly depending adjustment arm is attached to an end roller yoke of the horn roll and slideably engages the rigid frame member. When the corrugating device is pivoted relative to the three roll forming device, the rigid frame member automatically relocates the positions of each of the three rolls and adjusts spacings between center axes of adjacent rollers of each roll to assure that the individual rollers constantly and correctly align with the corrugations of the metal sheet as it enters the forming device and is spiralled into helical convolutions.
REFERENCES:
patent: 1659752 (1928-02-01), Thorsby
patent: 3269162 (1966-08-01), Fay
patent: 3417587 (1968-12-01), Campbell
patent: 3606783 (1971-09-01), Lewis
patent: 3991597 (1976-11-01), Krakow
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