SU403454A1 - METHOD OF PERIODIC PIPE ROLLING - Google Patents

Description

one

This invention relates to pipe production, in particular, to cold periodic rolling.

There is a method of periodic rolling tubes, including the deformation of the workpiece rolls with a stream of variable profile on a floating mandrel with a turn at the time of no contact of the rolls with the workpiece. However, the known method does not provide the required angle of rotation of a long and heavy pipe (coil) and the rolling of long, endless pipes.

The purpose of the present invention is to provide pipe rolling coils.

For this, rotation is carried out alternating from the initial position of the workpiece, with torque being applied on both sides of the deformation cone zone.

The proposed method is illustrated in the drawing.

The workpiece 1, fed to the area of compression, crimp working rolls with a stream of variable profile 2, performing reciprocating motion on the floating mandrel 3.

For rolling burrs on both sides of the deformation cone zone, a torque is applied, for example, a turning device 4. In the pipe section with the deformation cone a each cross section

has a constant tangential displacement equal to the angle of rotation. The rotation of the pipe in this region is alternating. At the site of the workpiece and the finished pipe biv

 the cross section is under the action of elastic (elastic-plastic) twisting. In these areas, using the device for loading the workpiece 5 (buoyancy, butt-welding machines), devices for unloading pipes 6 (forge-clotting machines, cutting machines for measuring pipes), the pipe is kept from turning, as a result of which tangential movements of pipe cross sections for these sections change from

the maximum at turning devices 4 is up to the corresponding devices of loading 5 and unloading 6 pipes.

The pipe sections g and d together with the loading devices 5 and the discharge of 6 pipes in the tangential direction are fixed. Rotation of the pipe in areas b and c in the same direction under the proposed conditions can lead to irreversible plastic deformations and ultimately to destruction. Therefore, in the section with the deformation cone a, an alternating rotation from the initial position is carried out.

This allows, on the one hand, to carry out the process of periodic rolling of pipes without burrs.

Tsev, on the other hand to lead the process, does not violate the integrity of the workpiece.

Subject invention

The method of periodic rolling of pipes, including the deformation, of the workpiece in the zone of the deformation cone with rolls with a stream of variable

The profile on the casting mandrel is rotated at the moment when the rolls do not come into contact with the workpiece, characterized in that, in order to ensure the coil pipe rolling, the rotation is alternating from the initial position of the workpiece, and the torque is applied on both sides of the deformation cone zone.