SU397246A1 - DEVICE FOR THE MANUFACTURE OF THIN-WALL SPIRAL TUBES - Google Patents

Description

one

The invention relates to the manufacture of electrically welded pipes.

A device for the manufacture of thin-walled pipes and tubes containing a lead-in wiring, a molding tool and a pair of bent rollers installed in the zenith of the pipe is known.

However, the turn of pipe manufacture on that device at the corners of the molding 15-20 °, ensuring maximum performance, the convergence angle of the tape edge and the pipe edge becomes too gentle, and even with slight fluctuations of the edges or when a corrugation appears on them, contact occurs the edges on the site before the shovobzhimnyh rollers, and, as a result of this, poor-quality welding and burn-through.

In order to improve the quality of the welded joint 1, m, in the proposed device, an additional pair of rubber clamps installed at an angle to the vertical axis of the pipe on the feed side of the tape in the device is installed.

In order to provide the angle between the converging edges in the optimal range depending on the pipe diameter, wall thickness, helix angle, the bum rollers can be moved radially, rotated about the center of the pipe and along the helix angle. Since the edge of the tape comes into alignment with the pipe surface not tangentially, the pipe is cut into a cut shape. The second pair of cobbing rollers, installed at the zenith of the pipe, calibrates the area of the welded joint, giving the pipe a regular geometric shape.

FIG. 1 shows the described device, a general view; in fig. 2 is a section along A-A in FIG. one; in fig. 3 shows a section along B-5 in FIG. i.

The device contains forming segments / in which holes are bored with a diameter equal to; the 1st outer diameter of the pipe. A support mandrel 3 is attached to one of the segments with the help of bolts 2. The iC segments with a mandrel fixed in them are mounted on a slab 4 and fastened to it strictly. The upper guide wiring 6 is fastened to the slab 5 with vertical supporting rollers 7 in the windows. The latter are fixed to the lower guide wiring 8. Between the upper and lower guide wires and the wiring harnesses placed in antifriction material.

The first, in the direction of movement of the tape, a pair of slot-type rollers 10 is set at an angle a to the vertical axis of the pipe from the side of supplying the tape to the forming device, and the second pair of pick-up rollers 11 are on the vertical axis at the point where the tape begins to be molded .

Tape 12 in a gap between the wiring, the forming segments / and the mandrel 3 is formed into a tube blank.

On the bed (fit. 3), the edges of the tape and pipe are heated by high-frequency currents. At the point with the edge of the tape, bend the first pair of sh, ovobrizhimnyh rollers to the contact iC by the edge of the pipe. This provides the necessary | For each case the angle of convergence of the edges. By changing the angle a, it is possible to adjust the angle p, and hence the intensity of the heating of the edges.

When rolling in the first pair of round crimping follicles, plastic welding of edges occurs.

Before welding, the edge of the tape is bent from position ab to point c, therefore the seam is pushed slightly into the pipe due to the elastic forces during movement. This defect is repaired by a second pair of roller pickers // installed at the IB point a, where the main part is molded into the tubular billet.

tapes. The second pair of rollers calibrates the seam area, giving the pipe a regular geometric shape.

The proposed molding device is most expedient to use at a very small angle (3 vanishing edges, as well as in the manufacture of pipes with a small wall thickness (0.1 + -fO, 5 mm).

Subject invention

A device for producing thin-walled spiral-seam pipes with high-frequency welding, containing lead-in wires, a molding tool and a pair of bogie-type rollers installed at the zenith of the tube, characterized in that, in order to improve the quality of the welded joint, it is equipped with an additional pair of bushing-type rollers located at an angle to the vertical axis pipes from a tape nodach in the device.

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