SU603459A1 - Device for levelling out the edges of semi-finished tube - Google Patents

Description

(54) DEVICE FOR; ALIGNMENT OF EMPHASIS OF PIPE PREPARATION

the radii to the top of the tube wall at the exit of the device,

This embodiment of the device for leveling the edge of the billet allows

get high-quality thin-walled

welded pipes by eliminating corrugations

on the edges of the workpiece before welding kpetyr.

FIG. 1 shows a general view of the proposed device, front view, in FIG. 2, section A-A in FIG. one; Fig, 3 - outer roll and the upper roll of the inner Mandrel device.

The device contains an inner mandrel J., made in the form of a cassette 2c with lower support rollers 3 and a cassette 4 with upper rollers 5. 7. Above the cassette 4 inside the mandrel 1, outside the tubular billet 7, the cassette 6 is mounted with outer rollers 9, which are mounted offset along the rolling axis relative to the upper rollers 5 of the inner mandrel /

The inner mandrel 1 and the outer cassette 8 are hinge-connected to the rod 1O fixed on the bed of the last stand of the forming mill (not shown in the drawing) to keep the cassettes with the rollers from longitudinal movement.

The ICs of the upper rollers 5 of the inner mandrel and outer rollers 9 are inclined towards the edge of the billet 7 at angles, respectively, oL and at 2. The upper rollers 5 of the inner mandrel and the outer rollers 9 are adjusted so that the distance. between their horizontal axes at the inlet of the tubular billet to the device is smaller than the radii of the gauge surfaces of these rollers, and at the exit is equal to their sum, taking into account the strip thickness. Rollers 5 and 9 cover the peripheral parts of the billet in each direction with a width of up to. 1/10 from shchIriny strips.

The device operation is as follows

In front of the welding stand, the tube blank 7 passes through a device for leveling edges. The edges of the workpiece 7, the passage through the device, are elastically plastic-curved with an amplitude amplitude in two planes: in the plane of the pipe axis to a plane perpendicular to the axis of the forming pipe. In addition, due to the extension of the path traversed by the edge; it is tensioned before welding and the elimination of previously formed corrugations occurs.

The device allows the manufacture of high-quality thin-walled pipes and enables the production of particularly thin-walled pipes.

Testing the device for leveling the edges of the billet before welding in pilot production of pipes 152, -4x1.5 at the mill 51-152 by the Dnepropetrovsk Pipe Rolling Plant. V.I. Lenin showed that; The proposed device eliminates the corrugations formed in the forming mill.

The device was made to align bumps with a height of 1.5 mm (0.6%) that occurred at the beginning of the work. The tube blank in front of the welding stand (where this device was located) had a vertical-oval cross-section with the forming radius of the peripheral part of the tube blank, mm. Roller spacing i 32.5 mm, radius on the roller at the entrance R 50 mm, radius of the upper roller of the mandrel at the entrance c 40 mm, t. A.

T

±

: Ui-0.88, ot

.0,725, 1fl), R.

about

one,

ratio t, 2S,

The outer radius of the outer roller is H, 46 mm, and the radius of the upper roller of the striker is K, j 44 mm. The rollers covered the peripheral part of the strip 35.-30 mm. In total, there were four external rollers in the device, the upper rollers were corrected five. In addition, the device had three support rollers, which. leverage at the bottom of the pipe.

After exiting the device, the corrugations were completely eliminated due to their plastic deformation and compression.

Claims (2)

1. The patent of Germany No. 846838 cl. 7 to 37/08 publ. 1952. 2. Korolev A, A, Mechanical equipment of rolling shops M., Metappurgizdat, 1965, s .. 278-279 ///////// -А Фте. 1 fftimemie truLy