SU1256823A1 - Mill tool for continuous rolling of tubes - Google Patents

Description

The invention relates to pipe production and can be used for longitudinal mandrel rolling of pipes.

The aim of the invention is to improve the quality of pipes by leveling the deformations and stresses along the perimeter.

Figure 1 shows the instrument, a general view; figure 2 - view And figure 1. The tool contains oval gauges formed by two flow rollers 1, of which the second is turned by the plane of the first connector by an angle,

tiyu relative to the second - at a slightly larger angle, and so on until the angle between the last and the penultimate, equal to 90 °; The die plate 2, calibrating well-calibers 3, a stepped mandrel in the form of a rod A with steps 5 of increasing diameter from the first caliber to the last step, located in the zone of action of the die.

Pipe rolling using the proposed device is carried out as follows.

The workpiece is successively set into gauges formed by pairs of brook rolls 1, at the stage 5 of the mandrel, as a result of which the diameter and thickness of BuffA decrease simultaneously

us pipe wall. A pipe with inaccurate geometric dimensions (the difference reaches up to 20%), coming out of the last caliber, enters the space between the die 2 and the last stage of the mandrel and forms the final dimensions. Upon further movement, the pipe enters the calibrating gauges 3, which,

10 by creating tensile stresses, facilitates the working conditions of the die.

The location of the planes of the connector

relative to the first two calibers, each relative to 65-75, but another at an angle of 65-75 ° is due to the fact that, on the basis of experimental data, when the rolls are turned below 65, the pipes lose position stability relative to the caliber and slide;

20a, when rolls are turned over 75, the same undesirable phenomena are observed that are characteristic of rolls turning at an angle of 90 °.

The present invention allows 25 W to roll high quality pipes both on the surface and along the wall, since the indicated rotation of the planes of the gauge connectors allows leveling the deformations of the wall of the pipe 3Q along the perimeter and, accordingly, the stress-strain state of the metal.

Neither relative to caliber and slid;

and when rolls are turned over 75, the same undesirable phenomena are observed that are characteristic of rolls turning at an angle of 90 °.

The present invention allows the HT to roll high quality pipes both along the surface and along the wall, since said turning of the planes of the connector of calibers allows leveling the deformations of the pipe wall along the perimeter and, accordingly, the stress-strain state of the metal.

b

Editor L. Povhan

Compiled by L. Maturin

Tehred M. Khodanich Proofreader p. Shekmar

4861/7

Circulation 518 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

Claims (1)

TOOL FOR THE CONTINUOUS PIPE ROLLING MACHINE, containing sequentially located two-roll gauges installed with rotation of the connector planes relative to each other, a step mandrel with an increase in the diameter of the steps from the first gauge and calibrating and bending gauges, characterized in that in order to improve the quality of the pipes by alignment of deformations and stresses along the perimeter, it is equipped with a die located in front of the first calibrating-pulling caliber, and in the zone of its action the last stage of the mandrel is placed, while the second gauge is rotated by the plane of the connector relative to the first by an angle of 65-75 °; the rotation angle of each subsequent caliber is increased by a constant value to 90 ° relative to the last. ΣΖΖΖΖΖ fig L SU, 1256823