JPS6356027B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a spiral tube consisting of two plates.

When manufacturing a spiral tube consisting of two plates made of different or the same material, simply stacking the two strip-shaped plates and feeding them to the forming section using pinch rolls will result in an increase in the tensile strength of the plates or Due to the difference in bending radius in the forming section, the two plates cannot be uniformly fed to the forming section, and therefore cannot be stably wound into a spiral shape. However, conventionally, there is no method for uniformly feeding two plates to a forming section, and therefore it has been impossible to manufacture a spiral tube made of two plates.

In view of the above points, the present invention provides a method for manufacturing a spiral tube that can uniformly feed two plates to a forming section, thereby manufacturing a spiral tube made of two plates. An embodiment thereof will be described below based on the drawings.

FIG. 1 is a schematic configuration diagram of a spiral tube manufacturing apparatus, in which 1 and 2 are strip-shaped plates, 3 is a coil around which one plate 1 is wound, 4 is a coil around which the other plate 2 is wound, 5 and 6 are levelers for correcting the bends of the plates 1 and 2; 7 is a forming section that is made up of a plurality of rollers 8 and winds the plates 1 and 2 in a spiral; 9 is a forming unit that corrects the bends of the plates 1 and 2; This is a pinch roll that is fed to section 7. The plates 1 and 2 have different widths, and one plate 1 is wider than the other plate 2.

As shown in FIG. 2, the plates 1 and 2 are arranged such that both sides of one plate 1 protrude from both ends of the other plate 2, and one plate 1 is connected to the other plate 2. are stacked on top of each other so as to be positioned below, and are pinched from above and below by pinch rolls 9, and fed into the forming section 7 by rotation of the pinch rolls 9 in the longitudinal direction (in the direction of arrow A). However, at this time, at a position A near the rear of the plates 1 and 2 in the traveling direction of the pinch roll 8, fillet welding 10 is performed between the upper surface of both sides of one plate 1 and the lower part of both sides of the plate 2.
stick to each other. As a result, plates 1 and 2
Since they are integrated, they are uniformly fed to the forming section 7 by the pinch rolls 9, and are reliably wound into a spiral shape in the forming section 7. Note that the difference in width between the plates 1 and 2 may be such that the fillet welding 10 can be easily performed. Moreover, even if fillet welding 10 is performed continuously,
This may be done at appropriate intervals.

The plates 1 and 2 fed to the forming section 7 by the pinch rolls 9 are as shown in FIG.
At this time, at position B, both adjacent edges of the other plate 2 are continuously welded 11 as shown by imaginary lines in FIG. Further, at position C, both side edges of one plate 1 that are in contact with each other are continuously welded 12 as shown by imaginary lines in FIG. In this way, after first welding both side edges of the other plate 2 to fill the gap, weld the other plate 2 without a gap.
By welding both side edges of the weld, poor weld penetration can be prevented.

By the above procedure, a spiral tube consisting of two plates 1 and 2 is continuously manufactured.

In the above embodiment, an example was explained in which the plates 1 and 2 were wound so that one plate 1 was on the outside, but it is also possible to wrap the plates 1 and 2 so that the other plate 2 is on the outside. It's okay.

As explained above, according to the method for manufacturing a spiral tube according to the present invention, two plates are integrated by fillet welding and then fed to the forming section using pinch rolls, so that the two plates are The body can be uniformly fed to the forming section, and therefore a spiral tube consisting of two plate bodies can be manufactured. In addition, since the widths of the two plates are different, fillet welding can be easily performed, and when continuously welding the mutually contacting edges of the spirally wound plates, the welding process can be easily performed. It is possible to prevent poor penetration.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a schematic configuration diagram of a spiral pipe manufacturing apparatus, FIG. 2 is a cross-sectional view of two plates welded together by fillet welding, and FIG. Explanatory diagram of the state in which the plate is wound in a spiral shape, No. 4
The figure is a sectional view of a spiral welded part. DESCRIPTION OF SYMBOLS 1, 2... Plate body, 7... Molding part, 9... Pinch roll, 10... Fillet welding, 11, 12... Welding.

Claims (1)

[Claims] 1. Two strip-shaped plates with different widths are placed one on top of the other so that both sides of one plate protrude from both edges of the other plate, and the both sides of these plates are fed in the longitudinal direction. A spiral tube characterized in that these plates are fixed to each other by fillet welding, are spirally wound at a position forward of the welding position in the direction of travel, and the mutually contacting side edges of these plates are continuously welded. Production method.