CA2047747A1 - Sheet steel strip, process and device for manufacturing lock seam tubing with helical seams - Google Patents
Sheet steel strip, process and device for manufacturing lock seam tubing with helical seamsInfo
- Publication number
- CA2047747A1 CA2047747A1 CA 2047747 CA2047747A CA2047747A1 CA 2047747 A1 CA2047747 A1 CA 2047747A1 CA 2047747 CA2047747 CA 2047747 CA 2047747 A CA2047747 A CA 2047747A CA 2047747 A1 CA2047747 A1 CA 2047747A1
- Authority
- CA
- Canada
- Prior art keywords
- edge
- sheet metal
- metal strip
- seam
- winding
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
- B21C37/12—Making tubes or metal hoses with helically arranged seams
- B21C37/121—Making tubes or metal hoses with helically arranged seams with non-welded and non-soldered seams
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
- B21C37/12—Making tubes or metal hoses with helically arranged seams
- B21C37/126—Supply, or operations combined with supply, of strip material
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
- Folding Of Thin Sheet-Like Materials, Special Discharging Devices, And Others (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
Abstract
(57) Abstract A sheet steel strip which is wound to form lock seam tubing with helical seams has a projecting edge flange (2) along one longit-udinal side and a closable channel (11) on the other longitudinal side, which slips onto the edge flange of the last turn during wind-ing. The height (h) of the edge flange (2) is reduced by crease zones (4, 17) in the edge flange (2) and in the free flange (12) of the chan-nel, which are formed by upsetting during closing.
Description
The present invention relates to a sheet metal strip, ~proce~ure and an apparatus for winding lock-seamed helical seam pipes without the use of a spindle, the sheet metal strip being provided with a beaded edge that projects from a bent edge, this then entering a closeable U-edge on the second border until it contacts a matching edge during the winding process. When a strip of sheet metal whose borders are to be continuously locked together during winding that is carried out without a spindle, for example, as described in AT-B-316 283, 346 158, or 382 802, problems are encountered with respect to keeping the dimensions of the pipe cross-section constant. Such problems can be encountered as early as the first turn, which is bent manually so as to form a loop. However, serious difficulties are encountered mainly during the winding process, in connection with the locking of the seam which, when sheet metal of the usual thicknesses is used, can lead to a radial shift of between 0.7 and 1.3 mm per turn. The reasons for this may lie in the changes of length undergone by each border as it is being shaped and in the stretching of the projecting beaded edges in the turns, in which connection it is only possible to compensate for this stretching by compression when the seam is being closed and crimped in the normal course of events. For this reason, the periphery of the pipe will grow larger with each turn.
According to W0-A-89/05201, an attempt was made to compensate for these changes in cross-section by way of matching bending of the outer area of the sheet metal strip that bears the projecting beaded edge, this offset representing a step that projects into the interior of the pipe, with the result that the peripheral length of the border strip that bears the beaded edge is made 6maller by an amount that equals the enlargement error. ~his method can be used both for cylindrical and for rectangular pipes (With rounded edge8).
In a process for the production of cylindrical pipe~ that ic described in DE-~-3 324 463, supporting rollers are provided ln the interior of the resulting winding, and these contain pressure pick-ups. Any reduction of the periphery increases the pressure that acts on the rollers and an increase in the periphery reduces this pressure. The measured pressure values are compared to a nominal value that corresponds to the desired peripheral length by means of an electronic control unit and varied by means of a centre bending roller.
Other known corrective measures that can be used in the production, in particular, of welded cylindrical helical-seam pipes without the use of a spindle involve changing the bend of the sheet metal edge (DE-A-3 137 858) or changing the feed angle (DE-A-3 500 615).
It is the task of the present invention to make possible the production of slip-joint tubing that is of constant peripheral length without changing the sheet metal strip that is used.
According to the present invention, to this end a sheet metal strip is used in which the projecting beaded edge incorporates a crimp zone, ~o that the height of the beaded edge can be reduced by the deformation of this crimp zone.
A process according to the present invention, in which the sheet metal strip is so wound that, during the winding process, the U-edge of the incoming sheet metal strip slides onto the beaded edge of the last turn, whereupon the seam i6 closed, and in which the constancy of the periphery of each resulting turn is checked and, in the event of an increase compared to the nominal value, a corrective and reducing measure is initiated, provides for the fact that, 8S a reducing corrective measure, when the seam between the last winding and the incoming sheet metal strip is being clo~ed, at least the crimp zone of the beaded edge is compressed perpendicular to the sheet metal strip.
;~
20477~7 By forming a beaded edge of variable height, no attempt is made to change the periphery in that the main section o f the 6heet metal strip that forms the wall of the pipe is either bent or deformed in some other way: on the contrary, changes in the length of the periphery are evened out when the seam is closed by reducing the height of the beaded edge that enters the U-edge.
In place of steps in the border area of each turn this leads to steps between the undeformed turns. In the extreme case, the height of the steps amounts to no more than 1.5 to 2 mm, and is thus in the lower range of per mill values of the pipe periphery.
The crimp zone can be effected in any manner that can be implemented on a beaded edge of a sheet metal strip. Thus, it is possible to form a zone of expanded metal in the beaded edge by means of longitudinal slits or stampings and then expand these to a large initial height of the beaded edge. During subsequent crimping, the height of the beaded edge can be reduced, at most, to the original height.
In a preferred embodiment the crimping zone includes at least one area between the bent edge of the beaded edge that is bent out ~ideways. 8ecause of the formation of an area that i8~ bent out ~ideways, when the height is reduced there is a reinforcement ~thickening--Tr.) of the bend, when the bent out area results ln the formation of spaces, into which areas of the crimped beaded edge can move or into which they, in turn, can be folded. In addition, this results in the advantage that the bent-out beaded edge can be gripped by the unattached arm of the U-bead 80 that when the seam is formed, closing of the U-edge will be sufficient to provide for a 601id join. For this reason, there is no need to wrap over the locked seam, as was formerly the case.
A further preferred embodiment provides for the fact that the unattached arm o~ the U-bead also incorporates a crimped zone 20~7747 that can be deformed together with the crimped zone of the beaded edge. In this respect, the crimped zone in the unattached arm of the U-edge can also be formed in any desired way. If, for example, an extended metal zone is to be incorporated, the areas of the edge bead and of the unattached arm that incorporate the ridges and edges will cover each other when the U-edge is closed.
A seam that is formed in this way can also be folded over in the usual way. However, it is preferred that the crimp zone of the unattached arm of the U-edge can also be formed by a bent-out area, in which connection the two bent-out areas will lie one inside the other when the seam is closed.
When the helical-seam pipe is being wound, the crimp zone is compressed to the desired or necessary extent in order to reduce the height of the beaded edge. It is preferred that this be achieved such that at least the border area of the last winding that is close to the seam is pressed outwards relative to the incoming strip of sheet metal.
According to the present invention, an apparatus for carrying out this process, which has a closing roller on the outside and a back-up body that extends into the interior of the pipe, provides for the fact that the counter-body incorporates an element that presses against the border area of the last winding, the distance between the pressure surface of this element from the pressure roller being adjustable, and in that the annular shoulder that defines the seam-closing groove incorporates a diameter that is reduced by the maximal adjustable distance of the pressure surface. As has been shown, the annular shoulder of the closing roller that lies in the border area of the last winding is only necessary to close the seam and not, however, for positioning the last winding of the pipe that presses against the counter-body, so that it can be at a distance that corrqsponds to the adju6tment dimension. For this reason, adjustment of the pressure surface presses the last winding against the closing ~477~7 roller, whereas the position of the incoming sheet metal strip remains unchanged, and the height of the beaded edye, the contact edge of which lies within the U-edge, is reduced. The seam that is closing when this takes place prevents any spring-back on leaving the seam-closing apparatus, so that the 6tep that has been formed remains.
In a preferred embodiment, the element of the counter-body that presses against the border area of the last winding incorporates a rotating sleeve and a plurality of rollers that are supported in said sleeve, said rollers being set at different distances from the axis of the sleeve. Rotating the sleeve from the outside presents no problem, in which connection the maximal eccentricity of the pressure surface, can be achieved, for example, after rotation through approximately 90. The rollers serve to reduce friction.
Another embodiment foresees that the element that presses against the border area of the last winding incorporates a rotatable ring with an eccentric outer surface and a ~ressure body that lies against the eccentric outer surface and which can be displaced radially. In this embodiment, the pressure body could be in the form of a roller and the angular area of the eccentric pressure surface confined to a few degrees.
Rotation of the sleeve or of the ring can, for example, be effected by means of a servomotor.
The pre6ent invention will be described in greater detail below on the basis of the drawings appended hereto, without necessarily being confined to these. These drawings show the following:
Figure 1: a perspective view of a flat 6trip of sheet metal;
20~77~7igures 2 to S: the folding of a first embodiment of the long edges of the sheet metal strip, figure 2 showing the two edges immediately prior to being joined:igure 3: the open seam:igure 4: the closed seam without compression of the ~rimping zone;igure 5: the closed seam shown with maximum compression;igures 6 to 8: the folding of a second embodiment in the position shown in figures 2, 4, and 5;igures g to 11: the folding of a third embodiment in the position shown as in figures 2, 4, and 5;igure 12: a diagrammatic axial cross-section through a few turns of the pipe, with the seam-closing apparatus;igure 13: those parts of a first embodiment of the seam-closing apparatus that are relevant to the present invention, these being shown at larger scale:igure 14: a cross-section on the line XIV-XIV in figure 13;igure 15: a cross-section on the line XV-XV in figure 14;igure 16: a cross-section as in figure 14, in a position that has been rotated by approximately 90;igure 17: a cross-section as in figure 15, through a second embodiment;
Figure 18: a cross-section on the line XVIII-XVIII in figure 17..
A sheet metal strip 1 as shown in figure 1 has on one longitudinal border a beaded edge 2 and, on the other longitudinal border, a U-edge 11 which, as can be seen in figure 12, fit into each other when a pipe is wound, and form a connecting seam 20. When this is done, there is a beaded edge 2 on the free border of the resulting winding 1' and the U-edge 11 of the incoming sheet metal strip 1 slides onto this. The seam 20 is closed within the winding apparatus, which consists of the 6eam-closing roller 24, the body 28, and a bending tool (not shown herein). When round pipes 21 are being produced, the bending tool is effective constantly, in contrast to which, 20477~7 during the manufacture of rectangular pipes 21 it is only effective in the side members at appropriate distances. Figure 12 shows in exaggerated form that plpe~ 21 that are wound in thc usual way grow larger. This can be countered by the formation of steps between the windings 1', the height A of these being variable. seam formations that are suitable for this are shown in figures 2 to 11 at greater scale.
In the first embodiment that is shown in figures 2 to 5, each beaded edge 2 incorporates a first section 8 that extends essentially perpendicularly from the bent edge 3 and a quarter-round area 6 that extends to the lower edge 5 is adjacent to this. A further section 9 extends upwards from the lower edge 5 and this is essentially parallel to the 6ection 8; this then becomes a second bent area 7 that extends obliquely upwards as far as the first section 8. The height of the beaded edge 2 as far as the lower edge 5 is indicated by the letter h. Thus, the individual 6ections and areas of the beaded edge 2 enalose a space 10. The U-edge 11 incorporates a first arm 14 that extends essentially perpendicularly from the bent edge 18, and a transverse centre area 13 is adjacent to this; the second unattached arm 12 extends upwards from this, and this incorporates an area 15 that is bent outwards and ends with a section 1~ that extends obliquely upwards and inwards. The distances that are mar~ed 4 and 17 correspond to the crimping zones of the two edges, and these are deformed when the seam is closed. Once the beaded edge 2 has entered the U-edge 11, the edge S of the beaded edge 2 lies on the centre area 13, as can be seen in figure 3. The position of the two edges 2, 11 that is shown in figure 2 is only achieved during the production of rectangular pipes, since after the bending of each corner the beaded edge 2 lies over the whole of the following side length within the U-edge, and the seam 20 is closed as the pipe is advanced. When round pipes are being produced, the position 2011 77~7 shown in figure 3 is not realized because the seam 20 i8 closed at the time of entry. If a flush position of the inside 6urface of the last winding 1' and of the incoming sheet metal strip 1 is desired, which is to say, if no correction is needed, the seam 20 is closed in the position shown in figure 4, with the help of the two closing rings 26 and 27 of the closing roller 24, which define a groove 30. The radius of the closing ring 26 that acts on the incoming sheet metal strip 1 is greater by dimension a than the radius of the second closing ring 27 so that a gap corresponding to dimension a is left between the closing ring 27 and the last winding 1' in this position. It is not necessary that the last winding 1' be supported by the closing ring 27 since the U-edge 11 lies in the groove 30 and the lower edge 5 of the beaded edge 2 is supported on the centre area 13 of the U-edge 11. The closing ring 27 serves to press the end section 16 of the unattached arm lZ inwards so that it moves behind the section g and the inclined area 7 of the beaded edge 2. Because the height h of the beaded edge 2 remains unchanged, there is no deformation of the crimp zones 4 and 17.
In figure 5, the last winding 1' is pressed downwards by dimension a which is to say outwards relative to the axis 22 of the pipe (this reference number does not appear in figure 5), so that it lies on the smaller closing ring 27. This means that a 6tep that corresponds to the dimension a is formed on the inside of the pipe and the incoming sheet metal strip 1 is displaced inward by this dimension relative to the axis 22 of the pipe (figure 12) with the result that ~maller windings are formed.
Now, the crimp zones 4 and 17 are deformed, which is to say the f ir6t section 8 of the beaded edge 2 is pressed downwards until it lies on the centre area 13, and the first bent area 6 is bent even more and folded somewhat into the space 10; the second bent area 7 is bent down parallel to the winding 1', and the end section 16 of the U~edge 11, which is similarly bent down so as to be parallel, is clamped between the area 7 and the winding 1'.
20~7747 The bent area 15 of the unattached arm 12 is curved more and pressed against the closing ring 27.
The embodiment sh~wn in figures 6 to 8 incorporates simplified seam edges. The beaded edge 2 incorporates a curved area 6 that adjoins the bent edge 3 and this is contained within the crimp zone 4. A section 8 that ends on the lower edge 5 that lies wi~hin the U-edge 11 is adjacent to this. Once again, the U-edge 11 incorporates a first arm 14 that is essentially perpendicular to the sheet metal strip 1, and extends obliquely downwards and then becomes a centre area 13 that is inclined upwards within the bending area of which the edge 5 of the beaded edge 2 lies. The second unattached arm 12 incorporates a curved area 15 from which the end section 16 extends obliquely upwards. The bent area 15 and the end section 16 together form the crimp zone 17 of the unattached arm 12. Figure 7 shows the formation of the seam by means of the closing rings 26, 27 when the inside surfaces are flush, the unattached arm 12 having been brought close to the first arm 14. This increases the angle in the centre area 13, so that the end section 16 moves behind the bent area 6 of the beaded edge 2. If, as shown in figure 8, the last winding 1' is pressed downwards or outwards, respectively, the crimp zones 4 and 17 are deformed until the winding 1' lies against the closing ring 27, which means that the area 6 of the beaded edge 2 and the end section 16 of the U-edge 11 are pressed more or less parallel to the sheet metal strip. Thus, the height h of the beaded edge
According to W0-A-89/05201, an attempt was made to compensate for these changes in cross-section by way of matching bending of the outer area of the sheet metal strip that bears the projecting beaded edge, this offset representing a step that projects into the interior of the pipe, with the result that the peripheral length of the border strip that bears the beaded edge is made 6maller by an amount that equals the enlargement error. ~his method can be used both for cylindrical and for rectangular pipes (With rounded edge8).
In a process for the production of cylindrical pipe~ that ic described in DE-~-3 324 463, supporting rollers are provided ln the interior of the resulting winding, and these contain pressure pick-ups. Any reduction of the periphery increases the pressure that acts on the rollers and an increase in the periphery reduces this pressure. The measured pressure values are compared to a nominal value that corresponds to the desired peripheral length by means of an electronic control unit and varied by means of a centre bending roller.
Other known corrective measures that can be used in the production, in particular, of welded cylindrical helical-seam pipes without the use of a spindle involve changing the bend of the sheet metal edge (DE-A-3 137 858) or changing the feed angle (DE-A-3 500 615).
It is the task of the present invention to make possible the production of slip-joint tubing that is of constant peripheral length without changing the sheet metal strip that is used.
According to the present invention, to this end a sheet metal strip is used in which the projecting beaded edge incorporates a crimp zone, ~o that the height of the beaded edge can be reduced by the deformation of this crimp zone.
A process according to the present invention, in which the sheet metal strip is so wound that, during the winding process, the U-edge of the incoming sheet metal strip slides onto the beaded edge of the last turn, whereupon the seam i6 closed, and in which the constancy of the periphery of each resulting turn is checked and, in the event of an increase compared to the nominal value, a corrective and reducing measure is initiated, provides for the fact that, 8S a reducing corrective measure, when the seam between the last winding and the incoming sheet metal strip is being clo~ed, at least the crimp zone of the beaded edge is compressed perpendicular to the sheet metal strip.
;~
20477~7 By forming a beaded edge of variable height, no attempt is made to change the periphery in that the main section o f the 6heet metal strip that forms the wall of the pipe is either bent or deformed in some other way: on the contrary, changes in the length of the periphery are evened out when the seam is closed by reducing the height of the beaded edge that enters the U-edge.
In place of steps in the border area of each turn this leads to steps between the undeformed turns. In the extreme case, the height of the steps amounts to no more than 1.5 to 2 mm, and is thus in the lower range of per mill values of the pipe periphery.
The crimp zone can be effected in any manner that can be implemented on a beaded edge of a sheet metal strip. Thus, it is possible to form a zone of expanded metal in the beaded edge by means of longitudinal slits or stampings and then expand these to a large initial height of the beaded edge. During subsequent crimping, the height of the beaded edge can be reduced, at most, to the original height.
In a preferred embodiment the crimping zone includes at least one area between the bent edge of the beaded edge that is bent out ~ideways. 8ecause of the formation of an area that i8~ bent out ~ideways, when the height is reduced there is a reinforcement ~thickening--Tr.) of the bend, when the bent out area results ln the formation of spaces, into which areas of the crimped beaded edge can move or into which they, in turn, can be folded. In addition, this results in the advantage that the bent-out beaded edge can be gripped by the unattached arm of the U-bead 80 that when the seam is formed, closing of the U-edge will be sufficient to provide for a 601id join. For this reason, there is no need to wrap over the locked seam, as was formerly the case.
A further preferred embodiment provides for the fact that the unattached arm o~ the U-bead also incorporates a crimped zone 20~7747 that can be deformed together with the crimped zone of the beaded edge. In this respect, the crimped zone in the unattached arm of the U-edge can also be formed in any desired way. If, for example, an extended metal zone is to be incorporated, the areas of the edge bead and of the unattached arm that incorporate the ridges and edges will cover each other when the U-edge is closed.
A seam that is formed in this way can also be folded over in the usual way. However, it is preferred that the crimp zone of the unattached arm of the U-edge can also be formed by a bent-out area, in which connection the two bent-out areas will lie one inside the other when the seam is closed.
When the helical-seam pipe is being wound, the crimp zone is compressed to the desired or necessary extent in order to reduce the height of the beaded edge. It is preferred that this be achieved such that at least the border area of the last winding that is close to the seam is pressed outwards relative to the incoming strip of sheet metal.
According to the present invention, an apparatus for carrying out this process, which has a closing roller on the outside and a back-up body that extends into the interior of the pipe, provides for the fact that the counter-body incorporates an element that presses against the border area of the last winding, the distance between the pressure surface of this element from the pressure roller being adjustable, and in that the annular shoulder that defines the seam-closing groove incorporates a diameter that is reduced by the maximal adjustable distance of the pressure surface. As has been shown, the annular shoulder of the closing roller that lies in the border area of the last winding is only necessary to close the seam and not, however, for positioning the last winding of the pipe that presses against the counter-body, so that it can be at a distance that corrqsponds to the adju6tment dimension. For this reason, adjustment of the pressure surface presses the last winding against the closing ~477~7 roller, whereas the position of the incoming sheet metal strip remains unchanged, and the height of the beaded edye, the contact edge of which lies within the U-edge, is reduced. The seam that is closing when this takes place prevents any spring-back on leaving the seam-closing apparatus, so that the 6tep that has been formed remains.
In a preferred embodiment, the element of the counter-body that presses against the border area of the last winding incorporates a rotating sleeve and a plurality of rollers that are supported in said sleeve, said rollers being set at different distances from the axis of the sleeve. Rotating the sleeve from the outside presents no problem, in which connection the maximal eccentricity of the pressure surface, can be achieved, for example, after rotation through approximately 90. The rollers serve to reduce friction.
Another embodiment foresees that the element that presses against the border area of the last winding incorporates a rotatable ring with an eccentric outer surface and a ~ressure body that lies against the eccentric outer surface and which can be displaced radially. In this embodiment, the pressure body could be in the form of a roller and the angular area of the eccentric pressure surface confined to a few degrees.
Rotation of the sleeve or of the ring can, for example, be effected by means of a servomotor.
The pre6ent invention will be described in greater detail below on the basis of the drawings appended hereto, without necessarily being confined to these. These drawings show the following:
Figure 1: a perspective view of a flat 6trip of sheet metal;
20~77~7igures 2 to S: the folding of a first embodiment of the long edges of the sheet metal strip, figure 2 showing the two edges immediately prior to being joined:igure 3: the open seam:igure 4: the closed seam without compression of the ~rimping zone;igure 5: the closed seam shown with maximum compression;igures 6 to 8: the folding of a second embodiment in the position shown in figures 2, 4, and 5;igures g to 11: the folding of a third embodiment in the position shown as in figures 2, 4, and 5;igure 12: a diagrammatic axial cross-section through a few turns of the pipe, with the seam-closing apparatus;igure 13: those parts of a first embodiment of the seam-closing apparatus that are relevant to the present invention, these being shown at larger scale:igure 14: a cross-section on the line XIV-XIV in figure 13;igure 15: a cross-section on the line XV-XV in figure 14;igure 16: a cross-section as in figure 14, in a position that has been rotated by approximately 90;igure 17: a cross-section as in figure 15, through a second embodiment;
Figure 18: a cross-section on the line XVIII-XVIII in figure 17..
A sheet metal strip 1 as shown in figure 1 has on one longitudinal border a beaded edge 2 and, on the other longitudinal border, a U-edge 11 which, as can be seen in figure 12, fit into each other when a pipe is wound, and form a connecting seam 20. When this is done, there is a beaded edge 2 on the free border of the resulting winding 1' and the U-edge 11 of the incoming sheet metal strip 1 slides onto this. The seam 20 is closed within the winding apparatus, which consists of the 6eam-closing roller 24, the body 28, and a bending tool (not shown herein). When round pipes 21 are being produced, the bending tool is effective constantly, in contrast to which, 20477~7 during the manufacture of rectangular pipes 21 it is only effective in the side members at appropriate distances. Figure 12 shows in exaggerated form that plpe~ 21 that are wound in thc usual way grow larger. This can be countered by the formation of steps between the windings 1', the height A of these being variable. seam formations that are suitable for this are shown in figures 2 to 11 at greater scale.
In the first embodiment that is shown in figures 2 to 5, each beaded edge 2 incorporates a first section 8 that extends essentially perpendicularly from the bent edge 3 and a quarter-round area 6 that extends to the lower edge 5 is adjacent to this. A further section 9 extends upwards from the lower edge 5 and this is essentially parallel to the 6ection 8; this then becomes a second bent area 7 that extends obliquely upwards as far as the first section 8. The height of the beaded edge 2 as far as the lower edge 5 is indicated by the letter h. Thus, the individual 6ections and areas of the beaded edge 2 enalose a space 10. The U-edge 11 incorporates a first arm 14 that extends essentially perpendicularly from the bent edge 18, and a transverse centre area 13 is adjacent to this; the second unattached arm 12 extends upwards from this, and this incorporates an area 15 that is bent outwards and ends with a section 1~ that extends obliquely upwards and inwards. The distances that are mar~ed 4 and 17 correspond to the crimping zones of the two edges, and these are deformed when the seam is closed. Once the beaded edge 2 has entered the U-edge 11, the edge S of the beaded edge 2 lies on the centre area 13, as can be seen in figure 3. The position of the two edges 2, 11 that is shown in figure 2 is only achieved during the production of rectangular pipes, since after the bending of each corner the beaded edge 2 lies over the whole of the following side length within the U-edge, and the seam 20 is closed as the pipe is advanced. When round pipes are being produced, the position 2011 77~7 shown in figure 3 is not realized because the seam 20 i8 closed at the time of entry. If a flush position of the inside 6urface of the last winding 1' and of the incoming sheet metal strip 1 is desired, which is to say, if no correction is needed, the seam 20 is closed in the position shown in figure 4, with the help of the two closing rings 26 and 27 of the closing roller 24, which define a groove 30. The radius of the closing ring 26 that acts on the incoming sheet metal strip 1 is greater by dimension a than the radius of the second closing ring 27 so that a gap corresponding to dimension a is left between the closing ring 27 and the last winding 1' in this position. It is not necessary that the last winding 1' be supported by the closing ring 27 since the U-edge 11 lies in the groove 30 and the lower edge 5 of the beaded edge 2 is supported on the centre area 13 of the U-edge 11. The closing ring 27 serves to press the end section 16 of the unattached arm lZ inwards so that it moves behind the section g and the inclined area 7 of the beaded edge 2. Because the height h of the beaded edge 2 remains unchanged, there is no deformation of the crimp zones 4 and 17.
In figure 5, the last winding 1' is pressed downwards by dimension a which is to say outwards relative to the axis 22 of the pipe (this reference number does not appear in figure 5), so that it lies on the smaller closing ring 27. This means that a 6tep that corresponds to the dimension a is formed on the inside of the pipe and the incoming sheet metal strip 1 is displaced inward by this dimension relative to the axis 22 of the pipe (figure 12) with the result that ~maller windings are formed.
Now, the crimp zones 4 and 17 are deformed, which is to say the f ir6t section 8 of the beaded edge 2 is pressed downwards until it lies on the centre area 13, and the first bent area 6 is bent even more and folded somewhat into the space 10; the second bent area 7 is bent down parallel to the winding 1', and the end section 16 of the U~edge 11, which is similarly bent down so as to be parallel, is clamped between the area 7 and the winding 1'.
20~7747 The bent area 15 of the unattached arm 12 is curved more and pressed against the closing ring 27.
The embodiment sh~wn in figures 6 to 8 incorporates simplified seam edges. The beaded edge 2 incorporates a curved area 6 that adjoins the bent edge 3 and this is contained within the crimp zone 4. A section 8 that ends on the lower edge 5 that lies wi~hin the U-edge 11 is adjacent to this. Once again, the U-edge 11 incorporates a first arm 14 that is essentially perpendicular to the sheet metal strip 1, and extends obliquely downwards and then becomes a centre area 13 that is inclined upwards within the bending area of which the edge 5 of the beaded edge 2 lies. The second unattached arm 12 incorporates a curved area 15 from which the end section 16 extends obliquely upwards. The bent area 15 and the end section 16 together form the crimp zone 17 of the unattached arm 12. Figure 7 shows the formation of the seam by means of the closing rings 26, 27 when the inside surfaces are flush, the unattached arm 12 having been brought close to the first arm 14. This increases the angle in the centre area 13, so that the end section 16 moves behind the bent area 6 of the beaded edge 2. If, as shown in figure 8, the last winding 1' is pressed downwards or outwards, respectively, the crimp zones 4 and 17 are deformed until the winding 1' lies against the closing ring 27, which means that the area 6 of the beaded edge 2 and the end section 16 of the U-edge 11 are pressed more or less parallel to the sheet metal strip. Thus, the height h of the beaded edge
2 is reduced at most by the dimension a. Similarly formed folded seams are shown in figures 9 to 11. The difference compared to the embodiment shown in figures 6 to 8 is essentially that the beaded edge 2 incorporates a 6ection 9 that iB bent back obliquely upwards from the edge 5, so that the two sections 8 and 9 which form an approximate V-shape form a larger contact surface within the U-edge 11 (figures 10, 11) and hold the beaded edge 2 more securely within the U-edge 11, above all when the height h (figure 10) is not reduced. The bent back section 9 is of about 20477~7 the same height as the section 8 so that, as is shown in figure 11, with the maximally compres6ed crimp zones 4, 17, the area 6 lies closely against the bent edge 3 at the unattached end of section 9.
The types of folded seams described heretofore proceed mostly from the prerequisite that in each case a flush winding leads to an increase in the size of the pipe, so that only reductions are required. Under some circumstances, which cannot be determined exactly, a flush winding can also lead to a reduction in the size of the pipe, which can be corrected by the reversed formation of the steps. In this case, too, the sheet metal strip described heretofore can be used providing one starts from a peripheral length that is too great and which, in the case of a reduction that is caused by the machinery, can be reduced to the desired peripheral length, and in the case of changes by means of which this degree of reduction is not achieved, the appropriate crimping of the beaded edge 2 is carried out. However, an alternative to this is the use of a sheet metal strip 1 in which the first arm 14 of the U-edge 11 is shortened so that, in the case of a height h that is not reduced, it is not possible to achieve a flush starting position as is shown in figures 4, 7, or 10, but rather an opposite step results between the two sheet metal ~trips, by which the winding 1' is shifted upwards or closer to the axis 22 of the pipe. Then, the crimp zones 4, 17 are made smaller for the flush winding.
It is, of course, understood that in all of the folded eeam types described heretofore the compression of the crimp zones 4, 17 and thus the change in the height h can be adjusted to any intermediate value that results from the changes of the peripheral length that is checked at least once per winding 1l.
In order to be able to press the last winding 1' downwards or outwards--eince thie amounts at most to a few millimeters, a change of the whole pipe that has already been wound is not 2~77.~7 necessary--as is shown in figures 13 to 16, the inner counter-body 28 incorporates a pressure surface that can be varied in its distance from the smaller closing ring 27 of the closing roller 24. In particular, the counter-body 28 includes a fixed bearing shaft 29 that extends over about the last two windings 1', and a sleeve 23 that can rotate on the shaft 29; within the sleeve 23, distributed over approximately 90 of the periphery, there are rollers 25 that form the pressure surface and their spacing away from the shaft 29 increases. By rotating the sleeve 23 by means of a drive system (not shown herein) that is controlled as a function of changes in the peripheral length, each roller 2S is rotated into the working position by which the sleeve 23 projects by the required dimension a. Figure 14 shows a starting position in which the rollers 25 do not project, in which position the closing of the seam 20 takes place as shown in figures 4, 7, and 10, with the interior surfaces of the windings flush. The maximal rotation of the sleeve 23 by 90 is shown in figure 16.
In this position, steps are formed on the inside of the pipe that correspond to the maximum dimension a, when the closing of the seam 20 is effected as shown in figures 5, 8, and 11. In order to 6upport the rollers 25, the face end of the sleeve 23 incorporates drillings in which the rollers 25 can float. The safety sleeve 33 that fixes the rollers 25 in position in the axial direction is slid onto the bearing shaft 29 on the section of the counter-body 28 that extends into the pipe 21 and this safety sleeve 33 is preferably free to rotate on the bearing shaft 29.
A modified embodiment is shown in figures 17 and 18. In this embodiment, the counter-body 28 once again includes a bearing shaft 29 on which a sleeve 23 is free to rotate. The sleeve 23 i~ connected to a ring 35 of smaller diameter, the outside surface 31 of which is eccentric relative to the bearing shaft 29, as can be seen, in particular, in figure 18. The ring 35 that is o~ smaller diameter extends within the safety sleeve 33 20~7747 which, in this embodiment, is secured to the bearing shaft 29.
This safety sleeve 33 incorporates a radial guide slot 34.
Within the guide 510t 34 there is a pressure body 32, in particular a roller, that can be moved radially, and this works in conjunction with the eccentric outer surface 31 of the ring 35. The floating pressure body 32 is prevented from falling out by means of an outer taper of the guide slot 34. Figures 17 and 18 show the position in which the pressure surface of the pressure body 32 lies flush within the outer surface of the sleeve 23, so that in this position the seams can be closed as shown in figures 4, 7, and 10. If the sleeve 23, and thus the ring 35, is rotated in the direction indicated by the arrow 36, the eccentricity of the outer surface 31 will displace the pressure body 32 outwards within the guide slot 34, in which connection the maximal dimension a will result after a 90-degree rotation of the pressure body 32.
The types of folded seams described heretofore proceed mostly from the prerequisite that in each case a flush winding leads to an increase in the size of the pipe, so that only reductions are required. Under some circumstances, which cannot be determined exactly, a flush winding can also lead to a reduction in the size of the pipe, which can be corrected by the reversed formation of the steps. In this case, too, the sheet metal strip described heretofore can be used providing one starts from a peripheral length that is too great and which, in the case of a reduction that is caused by the machinery, can be reduced to the desired peripheral length, and in the case of changes by means of which this degree of reduction is not achieved, the appropriate crimping of the beaded edge 2 is carried out. However, an alternative to this is the use of a sheet metal strip 1 in which the first arm 14 of the U-edge 11 is shortened so that, in the case of a height h that is not reduced, it is not possible to achieve a flush starting position as is shown in figures 4, 7, or 10, but rather an opposite step results between the two sheet metal ~trips, by which the winding 1' is shifted upwards or closer to the axis 22 of the pipe. Then, the crimp zones 4, 17 are made smaller for the flush winding.
It is, of course, understood that in all of the folded eeam types described heretofore the compression of the crimp zones 4, 17 and thus the change in the height h can be adjusted to any intermediate value that results from the changes of the peripheral length that is checked at least once per winding 1l.
In order to be able to press the last winding 1' downwards or outwards--eince thie amounts at most to a few millimeters, a change of the whole pipe that has already been wound is not 2~77.~7 necessary--as is shown in figures 13 to 16, the inner counter-body 28 incorporates a pressure surface that can be varied in its distance from the smaller closing ring 27 of the closing roller 24. In particular, the counter-body 28 includes a fixed bearing shaft 29 that extends over about the last two windings 1', and a sleeve 23 that can rotate on the shaft 29; within the sleeve 23, distributed over approximately 90 of the periphery, there are rollers 25 that form the pressure surface and their spacing away from the shaft 29 increases. By rotating the sleeve 23 by means of a drive system (not shown herein) that is controlled as a function of changes in the peripheral length, each roller 2S is rotated into the working position by which the sleeve 23 projects by the required dimension a. Figure 14 shows a starting position in which the rollers 25 do not project, in which position the closing of the seam 20 takes place as shown in figures 4, 7, and 10, with the interior surfaces of the windings flush. The maximal rotation of the sleeve 23 by 90 is shown in figure 16.
In this position, steps are formed on the inside of the pipe that correspond to the maximum dimension a, when the closing of the seam 20 is effected as shown in figures 5, 8, and 11. In order to 6upport the rollers 25, the face end of the sleeve 23 incorporates drillings in which the rollers 25 can float. The safety sleeve 33 that fixes the rollers 25 in position in the axial direction is slid onto the bearing shaft 29 on the section of the counter-body 28 that extends into the pipe 21 and this safety sleeve 33 is preferably free to rotate on the bearing shaft 29.
A modified embodiment is shown in figures 17 and 18. In this embodiment, the counter-body 28 once again includes a bearing shaft 29 on which a sleeve 23 is free to rotate. The sleeve 23 i~ connected to a ring 35 of smaller diameter, the outside surface 31 of which is eccentric relative to the bearing shaft 29, as can be seen, in particular, in figure 18. The ring 35 that is o~ smaller diameter extends within the safety sleeve 33 20~7747 which, in this embodiment, is secured to the bearing shaft 29.
This safety sleeve 33 incorporates a radial guide slot 34.
Within the guide 510t 34 there is a pressure body 32, in particular a roller, that can be moved radially, and this works in conjunction with the eccentric outer surface 31 of the ring 35. The floating pressure body 32 is prevented from falling out by means of an outer taper of the guide slot 34. Figures 17 and 18 show the position in which the pressure surface of the pressure body 32 lies flush within the outer surface of the sleeve 23, so that in this position the seams can be closed as shown in figures 4, 7, and 10. If the sleeve 23, and thus the ring 35, is rotated in the direction indicated by the arrow 36, the eccentricity of the outer surface 31 will displace the pressure body 32 outwards within the guide slot 34, in which connection the maximal dimension a will result after a 90-degree rotation of the pressure body 32.
Claims (12)
1. A sheet metal strip for winding seamed helical-seam pipes (21) without the use of a spindle, with a beaded edge (2) that stands out from a bent edge (3) and which, on winding, enters a closeable U-edge (11) on the second border until a lower edge (5) is fully seated, characterized in that the beaded edge (2) incorporates a crimp zone (4) between the contact edge (5) and the bent edge (3), which, when deformed, reduces the height (h) of the beaded edge (2).
2. A sheet metal strip as defined in claim 1, characterized in that the crimp zone (4) includes at least one area (6, 7) of the beaded edge (2) that is bent out to one side.
3. A sheet metal strip as defined in claim 2, characterized in that the contact surface (5) is formed by a bent edge of an end area (9) that is bent back.
4. A sheet metal strip as defined in one of the claims 1 to 3, characterized in that the unattached arm (12) of the U-edge (11) also incorporates a crimp zone (17) that can be deformed together with a crimp zone (4) of the beaded edge (2).
5. A sheet metal strip as defined in claim 4, characterized in that the crimp zone (17) includes an area (15) of the unattached arm (12) that is bent out to the side.
6. A process for winding a helical-seam pipe (21) from a sheet metal strip without using a spindle as defined in one of the claims 1 to 5, the sheet metal strip (1) being so wound that the U-edge (11) of the incoming sheet metal strip (1) slides onto the beaded edge (2) of the last winding (1') during the winding process, whereupon the seam (20) is closed, and wherein the constant periphery of each resulting winding (1) is checked and a reducing corrective measure is initiated in the event of enlargement compared to a nominal value, characterized in that at least the crimp zone (4) of the beaded edge (2) is compressed perpendicularly to the sheet metal strip (1) between the last winding (1') and the incoming sheet metal strip (1), as a reducing corrective measure during closing of the seam (20).
7. A process as defined in claim 6, characterized in that at least the border area of the last winding (1') that is close to the seam is pressed outwards relative to the incoming sheet metal strip (1) for the compression of the crimp zone (4).
8. An apparatus for carrying out the process as defined in claim 7, with a seam-closing device that incorporates an outer closing roller (24) with a seam-folding groove (30) that is defined by two annular shoulders (26, 27), and an inner counter-body (28), characterized in that the counter-body (28) incorporates an element that presses against the border area of the last winding (1'), the distance of the pressure surface of which from the closing roller (24) can be adjusted; and in that the annular shoulder (27) that defines the seam-closing groove (30) that is opposite the pressure surface is of a diameter that is reduced by the maximal adjusting dimension (a) of the pressure surface.
9. An apparatus as defined in claim 8, characterized in that the element of the counter-body (28) that presses against the border area of the last winding (1') incorporates a rotating sleeve (23) and a plurality of rollers (25) that are incorporated in the sleeve (23), these being at different distances from the shaft (29) of the sleeve (23).
10. An apparatus as defined in claim 9, characterized in that the rollers (25) are arranged at increasing distances from the shaft (29) of the sleeve (23) in a peripheral section of approximately 90°.
11. An apparatus as defined in claim 8, characterized in that the element that presses against the border area of the last winding (1') incorporates a rotatable ring (35) with an eccentric outer surface (31) and a pressure body (32) that is so supported as to be radially displaceable and which lies against the eccentric outer surface (31).
12. A helical-seam pipe (21) wound from a sheet metal strip (1) as described in one of the claims 1 to 5, characterized in that steps are provided at least between some of the windings (1').
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ATA1/90 | 1990-01-02 | ||
| AT190A AT394815B (en) | 1990-01-02 | 1990-01-02 | SHEET METAL TAPE, METHOD AND DEVICE FOR PRODUCING FOLDED SCREW SEAM TUBES |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2047747A1 true CA2047747A1 (en) | 1991-07-03 |
Family
ID=3479040
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2047747 Abandoned CA2047747A1 (en) | 1990-01-02 | 1990-12-04 | Sheet steel strip, process and device for manufacturing lock seam tubing with helical seams |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0461231A1 (en) |
| JP (1) | JPH04505889A (en) |
| AT (1) | AT394815B (en) |
| CA (1) | CA2047747A1 (en) |
| WO (1) | WO1991009693A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8354368B2 (en) | 2008-06-24 | 2013-01-15 | Cognis Ip Management Gmbh | Cleaning composition comprising graft copolymers |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1992007670A1 (en) * | 1990-10-29 | 1992-05-14 | Bubb, Antony, John, Allen | Improvements in and relating to the formation of helically wound tubing |
| ES1025697Y (en) * | 1993-09-09 | 1994-07-16 | Campillo Jose Rodriguez | ARCHER COMPENSATOR GRAPHIC SYSTEM IN METAL CONTAINERS. |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI40528B (en) * | 1966-12-21 | 1968-11-30 | Eino Kalervo Malki | |
| AU417205B2 (en) * | 1968-10-17 | 1971-09-17 | Vulcan Australia Limited | Improved helically wound tubing |
| CA883780A (en) * | 1970-10-09 | 1971-10-19 | D. Hale Reginald | Apparatus for and the method of, making spiral seamed laminated sheet metal pipe |
| DE2127750C3 (en) * | 1971-06-04 | 1981-04-09 | Westaflex-Werk L. u. F. Westerbarkey GmbH & Co, 4830 Gütersloh | Double pipe |
| AT316283B (en) * | 1972-02-21 | 1974-07-10 | Schwarz Walter | Method and device for producing pipes |
| US3865146A (en) * | 1974-03-22 | 1975-02-11 | Johns Manville | Helically wound tubing and method of forming the same |
| US3940962A (en) * | 1974-05-09 | 1976-03-02 | Pacific Roller Die Company, Incorporated | Conduit making machine with diameter control and method |
| GB1599379A (en) * | 1978-05-31 | 1981-09-30 | Spiro Investment Sa | Tube-forming machines |
| DE3540125C3 (en) * | 1985-11-13 | 1997-05-07 | Hahn Fritz Gmbh Co Kg | Method and device for producing a corrugated tube by helically winding a corrugated, thin strip, preferably a steel strip |
-
1990
- 1990-01-02 AT AT190A patent/AT394815B/en not_active IP Right Cessation
- 1990-12-04 JP JP50181791A patent/JPH04505889A/en active Pending
- 1990-12-04 EP EP19910901529 patent/EP0461231A1/en not_active Withdrawn
- 1990-12-04 WO PCT/EP1990/002082 patent/WO1991009693A1/en not_active Application Discontinuation
- 1990-12-04 CA CA 2047747 patent/CA2047747A1/en not_active Abandoned
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8354368B2 (en) | 2008-06-24 | 2013-01-15 | Cognis Ip Management Gmbh | Cleaning composition comprising graft copolymers |
Also Published As
| Publication number | Publication date |
|---|---|
| WO1991009693A1 (en) | 1991-07-11 |
| AT394815B (en) | 1992-06-25 |
| ATA190A (en) | 1991-12-15 |
| EP0461231A1 (en) | 1991-12-18 |
| JPH04505889A (en) | 1992-10-15 |
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