Metal deforming – By deflecting successively-presented portions of work during... – By use of work-contacting wiper and moving – work-holding form
Patent
1991-09-13
1993-09-21
Crane, Daniel C.
Metal deforming
By deflecting successively-presented portions of work during...
By use of work-contacting wiper and moving, work-holding form
72149, B21D 500, B21D 5110
Patent
active
052458490
DESCRIPTION:
BRIEF SUMMARY
This invention relates to plate rolling and particularly to method and apparatus for rolling steel plate of small diameter. The invention also relates to the formation of uniform tapered pipe sections suitable for various applications e g. for use as a pole having street lighting applications.
The inventor has devised apparatus and methods for plate bending and forming pipes of cylindrical construction such as those disclosed in U.S. Pat. No. 3,879,994 to the same inventor and European Patent Specification No. 0029345. In my U.S Patent Specification there is disclosed a method of plate rolling to form substantially cylindrical pipes simply by bending a plate about a rotatable mandrel.
Steel plate is rolled by engaging an edge of a plate under a flange of a gripper rib extending axially along the cylindrical surface of the mandrel. The mandrel is turned to advance and curve the plate about the surface of the mandrel.
Complete pipes may be formed by this method by curving plate about the mandrel through approximately 180.degree. then engaging the opposite edge of the plate with the mandrel and curving the remaining 180.degree. to form a complete cylinder.
The present invention is specifically concerned with the production of tapered pipes that can be formed on a tapered mandrel having a gripper somewhat similar to that described in my earlier patent. It has been found to be possible to simply form a tapered mandrel and to then curve the plate about the mandrel resulting in the formation of a tapered pipe, however there are difficulties with providing differing tapers and differing pipe thicknesses with any given mandrel.
The present invention in one aspect seeks to provide a method and apparatus to produce a rolled pipe particularly pipes having differing tapers, thicknesses and diameter ranges on the same mandrel.
A further objective of the present invention is to provide pipe rolling apparatus of the type in which steel plate is drawn on to a mandrel having a gripper for gripping the edge of the plate and including improved means for applying pressure to the plate during the rolling operation irrespective of the location of the gripper.
A more specific object of the invention is to provide a mandrel allowing the formation of a tapered or frusto conical pipe, the mandrel taper and diameter being variable to form a variable range of pipe sizes and taper angles.
There is provided according to the present invention a plate rolling apparatus comprising a rotatable mandrel mounted in a frame,
a gripper rib on the mandrel extending axially therealong adapted to grip the edge of a plate to curve around the mandrel when the mandrel is rotated,
a single pressure roller mounted beneath the mandrel and adapted to contact the surface of the plate and apply an upward force against the plate and the mandrel, the pressure roll being laterally movable so as not to foul the gripper during plate engagement and yet apply a substantial squeezing force to said plate.
Said single pressure roller is mounted beneath the mandrel and adapted to contact the surface of the plate and apply an upward force against the plate, the pressure roll being laterally movable so as not to foul the gripper during engagement of the plate, and yet apply a substantial squeezing force to said plate and mandrel particularly during the final stage of forming.
The single roller applies pressure to said plate thereby avoiding undesirable lateral forces and is adjustable to be in direct alignment with the mandrel centre when the gripper is not in the vicinity.
The single pressure roller is particularly adaptable for use with the manufacture of small, thick wall pipes requiring high forces, e.g., tapered pipes suitable for use as power poles.
The present invention is more specifically described having reference to the production of tapered poles, however, in its broadest form it is applicable to parallel wall pipes.
In a more specific aspect of the invention, there is provided a mandrel suitable for the formation of hollow tapered pipe or frusto conical pip
REFERENCES:
patent: 289910 (1883-12-01), Grunder
patent: 2062591 (1936-12-01), Mather
patent: 2988127 (1961-06-01), Gray
patent: 3008220 (1961-11-01), Sammarco
patent: 3062266 (1962-11-01), Abbott
patent: 3351001 (1967-11-01), Achkio
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