Metal deforming – By deflecting successively-presented portions of work during... – By use of deflectors arranged to bend work longitudinally of...
Patent
1982-04-16
1985-01-01
Combs, E. Michael
Metal deforming
By deflecting successively-presented portions of work during...
By use of deflectors arranged to bend work longitudinally of...
72169, 72171, 72213, 72389, 72466, B21D 514, B21C 3708
Patent
active
044910045
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a method of manufacturing a metal pipe or the like. The invention further relates to an apparatus for manufacturing a metal pipe or the like from a metal sheet.
BACKGROUND OF THE INVENTION
At present, there is no method available for the manufacture of accurately measured lengthy pipes of great diameter in one working step. Similarly, accurately measured, thick-walled pipes to be used as rolls must be manufactured in a plurality of working steps, such as welding and lathing of the pipe. In the presently known methods, the manufacture of pipes of accurate diameters is complicated, e.g. due to inner stresses in pipe blanks; internal or external machining of pipes of accurately measured diameters results in deformations.
SUMMARY OF THE INVENTION
An object of the present invention is to overcome the above drawbacks. The object of the invention is especially to provide a novel method and apparatus which are particularly suitable for the manufacture of pipes having accurate diameters and for the calibration effected simultaneously with manufacturing.
For the characterizing features of the invention, reference is made to the accompanying claims.
DESCRIPTION OF THE DRAWINGS
The invention will be described in more detail hereinafter with reference made to the accompanying drawings, in which:
FIGS. 1-5 illustrate manufacturing of a pipe by the method of the invention, the pipe being shown in end view,
FIG. 6 is a perspective view of an apparatus according to one embodiment of the invention for carrying out the method, and
FIG. 7 is similar to FIGS. 1-5 showing an apparatus according to another embodiment for the manufacture of a pipe.
DESCRIPTION OF PREFERRED EMBODIMENT
FIGS. 1-5 show the bending of a standard width metal sheet into a pipe by means of the method of the invention. In FIG. 3 the bending of a metal sheet 1 is in progress. Said metal sheet 1 is positioned upon a supporting tool 3, so that the sheet is supported on said tool along two parallel and straight support lins b, c, i.e. contact points between the metal sheet and the support tool form said parallel support lines (in perpendicular direction to the plane of the drawing sheet). Bending is effected by applying to sheet 1 a bending force perpendicularly to the sheet along a longitudinal straight line of action a of the sheet, i.e. along the straight line formed by the contact points between a bending tool and sheet surfaces, said bending force being applied by means of a bending tool 2. The line of action a of said bending tool lies between the support lines b, c of said support tool 3, said bending tool thus bending the sheet along the line action between the support lines. At the same time the sheet is conveyed in its lateral direction, i.e. in the direction of an arrow 19, the sheet thus bending into the shape of a pipe jacket. In FIG. 1 the bending of sheet 1 is just beginning for the forward edge of the sheet, in FIG. 2 the bending has proceeded into a nearly semi-circular shape for the forward edge of the sheet and the bending of the trailing edge is just beginning, in FIG. 3 the sheet bending is just nearing its end for the trailing edge of the sheet, in FIG. 4 the bending has been finished also for the trailing edge, and on FIG. 5 the sheet edges are urged against each other for a continuous pipe profile 1', shown by dashed lines in FIG. 5.
In FIGS. 1-5 the bending tool 2 comprises a roll 4 rotatably journalled on a top bracket 15 which is movable by means of an actuator. Accordingly, the support tool 3 comprises two support rolls 5, 5' which are rotatably journalled on a base structure 13. Rolls 4, 5, 5' are parallel and aligned with each other with bending rolls above the support rolls between the latter. Further in the embodiment of FIGS. 1-5, the apparatus is provided with a lengthwise extending support member 6 which is parallel to rolls 4, 5, 5' and positioned between the support rolls and whose upper edge has formed therein a groove 7 parallel to the rolls and defined by edges 8, 9. The supp
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