SU1304955A1 - Line for producing spiral seamed tubes with helical corrugations - Google Patents

Abstract

The invention relates to the production of welded spiral pipes, in particular pipes with helical corrugations playing the role of compensators. The aim of the invention is to reduce the labor capacity of a l 14 - the capacity of the production line, as well as to improve the compensating properties of the pipes. During convolution of the strip into the tube, the radii of curvature of the corrugation change, its height decreases. The reason for these disadvantages is the presence of an unstable deformation zone. The stability of the deformation in the said zone is ensured by applying biasing forces from the rollers 22 to. the sections of the strip located on both sides of the corrugation, as well as the pressing of the corrugation to the surface of the sleeve 9 into the cavity of its screw groove by the central roller 24. The distance between the axes of the rollers 22 and the axis of the roller 24 is determined from the ratio E (0.077 .® tO, 13) b. 1 hp f-ly, 4 ill. sl and

Description

Fiz. 3

The invention relates to the processing of metals by pressure and can be used to manufacture pipes with helical corrugations playing the role of compensators.

The purpose of the invention is to reduce the labor intensity of the production line, reducing the time for its readjustment, as well as improving the compensating properties of pipes.

Fig. 1 is a schematic of a pipe line; in fig. 2- bracket mounting unit in line; FIG. 3 is a view A of FIG. 1; FIG. 4 is a section BB of FIG. 2,

The line (FIG. 1) contains a sheet metal roll unwinder 1, a mill 2 for profiling the longitudinal corrugation 3 on the sheet strip 4 side guide rollers 5, a feeding machine 6, lead wires 7, a pressing mechanism 8, and also located on the support - a revolving frame (not shown) at an angle of convolution of the strip on the forming device in the form of a sleeve 9, welding equipment 10, a guide rest 11 and a cutting machine 12, Lini may also contain (not shown) receiving roller table in front of the decoiler 1, placed between the decoiler 1 - and profile gi- any side-pitched 2 straightener, scissors for sheet lengths of all stripes, butt-welding machines, pet leobrazuyuschie rollers drive, where th loop is formed, the drive rollers, zadayushd1e polo su of us in camp 2, and the drive disc with scissors kromkokroshitelem ,. located between the lateral directions of yushi 1 rollers 5 and the feeding machine 6,

A biasing mechanism 8 (Fig. 1) is placed between the lead-in wires 7 and the sleeve 9 and contains (Fig. 2-4) bracket 13 located on top of the base 14 of the lead wires 7 between the two guide bars 15. The bracket 13 has the possibility of longitudinal movement along the axis the corrugation 3 on the sheet strip 4 between the guides 15 attached to the base 14 parallel to the feed axis of the strip 4 in BTvnKV 9,

The bars 15 are interconnected from above by a plate 16, on which a clamping screw 17 j is mounted, fixing the bracket 13 in a predetermined position,

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At the end of the bracket 13 closest to the sleeve 9 there are two axes 18 and 19 parallel to each other, perpendicular to the feed axis of the sheet strip 4 into the sleeve 9, Axis 18 is connected to the brace 13 through the adjusting screw 20 with the possibility of movement in a vertical plane relative to the bracket 13, Axis 19 are rigidly fastened with a bracket 13 above the screw groove 21 of the bushings 9. Two cylindrical rollers 22, are rotatably mounted on the axis 18 rotatably. placed on both sides of the screw groove 21 over the edge of the lower end 23 of the sleeve 9. The center roller 24 is rotatably mounted on the axis 9 and is included in the screw groove 21 of the forming sleeve 9, the roller 24 has a convex side surface identical to the contour of the inner surface of the corrugation 3 or that, similarly, the corresponding contour of the corrugating section of the upper roll in the last stand of the profiling mill 2, the distance between the axes 1.1 and 18 and 9 and, consequently, the line of application of the pressing force from the rollers 22 and 24 to the strip 4 and the corrugation 3, measuring emoe along the helical groove 21, should be equal to O, the length of one turn r7-0,13 .paza 21

The manufacture of pipes with a spiral corrugation in a line is carried out as follows.

The sheet strip 4 of the unwinder 1 is fed to the forming mill 2, for example, seven-blade, in which rollers with appropriate calibration perform longitudinal corrugation 3. Then strip 4 with corrugation 3 through lateral guide rollers 5 and lead wires 7 by means of a feeding machine 6 served in the sleeve 9, pressing the corrugation 3 and the strip 4 to the sleeve 9 by the force of the pressing mechanism 8. In the sleeve 9, the strip 4 is rolled at an angle into the spiral-seam pipe 25 with screw corrugations, szariva outside and inside the edges of the strip 4 using welding equipment 10, Tr The ba 25 is fixed in the guide lunette 11, which by its specified displacement maintains a constant gap between the edges of the pipe 25. As the lunette 11 passes, the pipe 25 is cut with a cutting machine 12 into measured lengths and sending 0

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They are placed on the pipe end calibration section 25.

The main reason for the poor quality of spiral-seam pipes 25 with screw-corrugations, manufactured according to the traditional technology, is the unstable deformation of the corrugation 3 in the sleeve 9, resulting in flat areas along the spiral corrugation. The pads cause the friction of the pipe 25 and, as a result, the plugging of the sleeve 9, the discrepancy between the edges of the strip 4 in the sleeve 9 before welding and the buckling of the strip 4, except for toro, when the strip 4 is rolled into the tube 25 without pressing it to the sleeve 9, the radii of curvature the corrugation 3 decreases its height. I

The reason for these shortcomings

This is the presence of an zone of unstable deformation of the strip 4 and the corrugation 3. The arched zone extends along the axis of the strip 4 from the lower edge 23 of the sleeve 9 into the latter for a length E along the screw groove 21, equal to t 0.07-0.13L, where L is the length one turn of the screw groove 21. To obtain high-quality pipes 25, it is sufficient to ensure stable deformation of the strip 4 and, in particular, the corrugation 3 only in this zone. The absolute length of this zone depends on the thickness and diameter of the pipe 25, the depth and width of the corrugation 3, the physicomechanical properties of the source metal and the convolution angle sb. With standardized corrugation dimensions 3 and the initial metal marks, the universal parameter determining the required zone length is the width L of one turn of the screw groove 21, which depends on the diameter of the pipe 25 and the roll angle L. The smaller the ratio of the thickness of the pipe 25 to its diameter, the greater the length b of the zone of unstable deformation.

The sustained deformation in the said zone is ensured by applying biasing forces from the rollers 22 to the sections of the strip 4 ,. 3-over the lower edge 23 of the sleeve 9 located on both sides of the corrugation, serving as the boundary of the beginning of the zone of unstable deformation, and also pressing the corrugation 3 to the surface of the sleeve 9 into the cavity of the screw groove 21 by the central roller 24 located at the distance t from the rollers 22, t . on the farthest from the bracket 13 border of the said zone. With

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In this case, the rollers 22 and 24 should not press the strip 4 to the sleeve 9 at a distance of t = 0.13L, since on the strip 4 before it passes through the roller 24, the vehicle has flat flaps. At a distance t 0,07L between the rollers 22 and 24, the flat areas in the vehicle in lane 4 after the passage of the roller 24, which is also unacceptable.

The stable operation of the line is ensured under the following conditions: the length of each of the lines of application of the pressing force from the rollers 22, i.e. the width of the rollers 22 is equal to 1.0-1.2; the width of the corrugation 3; The axes 18 and 19 of the rollers 22 and 24 must be perpendicular to the axis of feed of the strip 4 into the sleeve 9 in order to avoid movement of the strip 4 due to crescent in the transverse direction, which violates the optimal conditions for welding its edges. For the same reason, as well as to calibrate the dimensions of the corrugations 3 when exiting the unstable deformation zone, the roller 24 should have a convex side surface corresponding to the contour of the inner surface of the corrugation.

The corrugator pressure was applied by the roller 24 when setting the line by moving the sleeve 9 of the bracket 13 in the guides 15, followed by fixing its position with a clamping screw 17 that senses the reactive force from the corrugation 3 to the roller 24. The force of the rollers 22 is pressed by moving In the vertical axis axis 18 with its position locked with an adjusting screw 20,

When changing the line, it is enough to take the clamping screw 17 away from the bracket 13 and move the bracket 13 to the opposite direction from the sleeve 9 until it stops.

The presence of the roller 24, calibrating the shape of the corrugation 3 at its exit from the zone of unstable deformation, ensures the accuracy of the dimensions of the pipe 25 even with some deviations of the geometrical and physico-mechanical parameters of the strip 4 allowed by the technical conditions. This leads to a higher compensating properties of pipes 25 with screw corrugations.

Claims (1)

1. Lines for the manufacture of helical pipes with helical corrugations. 5 1304955 The supporting machine for profiling the longitudinal corrugations on the strip j is the guide and feed mechanisms, lead-in Wiring, the forming device in the sleeve with at least one screw groove on its working surface p pressing mechanism with cylindrical rollers placed on both sides of the groove, welding equipment , directing rest and cutting machine, distinguishing the fact that, in order to reduce labor-intensive Kora but pa ra on tr leu wounds ka r st mo the production of the line, as well as the improvement of the compensating properties of the pipes, the clamping mechanism is made in the form of a brackets, at the near-forming device, the end of which, in the zone the edges of the lower end of the sleeve are mounted cylindrical rollers, the axis of which is perpendicular to the axis of feed of the strip into the forming device, and at a distance. along the helical groove, equal to (0.07-0.13) L, where L is the length of one slot of the hub, a central roller is placed, the axis of which is parallel to the axis of the cylindrical rollers. 2, Line pop, 1, characterized in that, in order to reduce changeover time, the input wiring is equipped with guides, the clamping mechanism bracket is mounted on the guides with a possibility of movement and equipped with a vertical adjustment mechanism. 77 ff 7 19/2220 I. I // I / hertz m l FIG.