RU2227077C2 - Apparatus for sizing and straightening end portions of large-diameter tubes - Google Patents

Abstract

FIELD: plastic metal working, namely sizing and straightening end portions of large-diameter tubes after heat treatment. SUBSTANCE: apparatus includes two three-roller and two one-roller heads. Each three-roller head has two outer sizing rollers and one inner sizing roller with parallel axes and motion drive units. Each one-roller head has one sizing roller and individual drive for moving by tube diameter. Apparatus is provided with rotary platform having guides mounted on rotary shaft normally relative to straightening axis. Three- roller heads are arranged diametrically relative to straightening axis in guides of platforms by means of frames. One-roller heads are mounted between three-roller heads diametrically relative to straightening axis also in guides of platform with use of frames. EFFECT: enhanced quality of sizing ad straightening large-diameter tubes, reduced out-of-roundness of tubes. 3 cl, 4 dwg

Description

The invention relates to the field of metal forming for calibration and straightening of pipe ends of large diameter ⌀ 530-1420 mm after heat treatment, especially spiral-seam, as a result of which the ovality of the pipe end does not correspond to a specific configuration.

The inconstancy of the pipe end according to the configuration requires during the construction of pipelines to deal with the selection of pipe ends for joining, which is very inconvenient. The fitting of pipes for joining on the track due to straightening of the ends is difficult due to the springing of the strip, formed at an angle into a spiral seam pipe.

A device is known for calibrating and straightening the ends of large diameter pipes, see ed. testimonial. USSR No. 317453, cl. In 21 D 3/02, decl. 06/26/1970, publ. 10/10/1971

This device contains two support external calibrating drive rolls with an adjustment mechanism and an internal calibrating drive pressure roller.

A disadvantage of the known device is that, as a result of the calibration of the pipes, the equality of plastic deformations around the perimeter of the pipe is not achieved and, as a result, residual ovality occurs and the problem of straightening the ends of the pipes is not solved.

Of the known devices for calibrating and straightening the ends of large diameter pipes, the closest in technical essence is the device described in Japanese Patent No. 57-50573, class. In 21 D 3/14, declared 09.24.76, publ. 10/28/82

This device for calibrating and editing the ends of large-diameter pipes contains external and internal calibrating rollers placed around the perimeter of the pipe, which can conditionally be combined into three-roller heads having two external calibrating rollers and one internal calibrating roller with parallel axes and displacement drives, as well as single-roller heads with one calibrating roller having an individual drive of movement on the pipe diameter. The rollers squeeze the pipe wall at its end part from the inside and the outside and during the rotation of the pipe carry out its editing and calibration using both one group of rollers and two groups placed in different sections around the perimeter at the end of the pipe.

A disadvantage of the known design of the device for calibrating and straightening the ends of large-diameter pipes is that it does not ensure equality of elastic and plastic deformations during calibration, which causes a residual ovality of the workpiece within 2% of the diameter after calibration, which is insufficient in conditions of pipe joining on highway and requires additional equipment, such as centralizers.

Another disadvantage of the known design of this device is that the calibration process is performed without taking into account elastic deformations around the entire perimeter of the pipe. Thus, the known device for calibrating and editing the ends of large diameter pipes does not provide high-quality editing and calibration of the ends of large diameter pipes along the entire perimeter equally.

The objective of the present invention is to provide a device for calibration and straightening of the ends of pipes of large diameter, which allows to improve the quality of calibration and straightening, to reduce the ovality of the ends of the pipes by equalizing the values of plastic and elastic deformations during calibration and straightening of the end of the pipe.

This object is achieved in that a device for calibrating and straightening the ends of large-diameter pipes, containing two three-roller heads having two external calibrating rollers and one internal calibrating roller with parallel axes and displacement drives, as well as single-roller heads with one calibrating roller, each of which has an individual displacement drive on the diameter of the pipe, according to the invention is equipped with a rotary platform with guides mounted on the drive shaft perpendicular to the dressing axis, three roller heads are located diametrically relative to the axis of editing in the platform guides by means of frames, and single-roller heads are installed between three roller heads diametrically relative to the axis of editing in the platform guides by means of frames.

Each three-roller head is made in the form of two kinematically connected levers mounted on the frame, carrying external calibrating rollers and having a common displacement drive, and a lever carrying an internal calibrating roller with an individual displacement drive.

Each single-roller head is made in the form of a lever mounted on the frame, carrying a calibrating roller and kinematically connected with an individual displacement drive to the pipe diameter, while their frames are located in the platform guides and are equipped with screw pairs for adjusting to the pipe diameter.

Such a constructive implementation of the device for calibrating and dressing the ends of large diameter pipes will improve the calibration and dressing of the ends of large diameter pipes and bring the ovality of the end of the pipe to within 0.5% of the diameter.

This is achieved by the fact that the three-roller heads mounted on the platform diametrically relative to the axis of editing allow the pipe end to be reshaped with two external rollers, elastic strains to be matched and loaded with one internal calibrating roller, creating a plastic strain equal to the elastic strain.

If necessary, if the pipe has a jammed end or saddle, then the device allows you to edit the end of the pipe by installing on the platform diametrically relative to the axis of editing an additional two single-roller heads. In combination of two single-roller and two three-roller heads, the device performs the function of an eight-roller straightening machine working according to the traditional theory of dressing.

To explain the invention, a specific embodiment of the invention is provided below with reference to the accompanying drawings, in which:

figure 1 shows a device for calibrating and editing the ends of pipes of large diameter;

figure 2 is the same, plan view;

figure 3 is the same, a view along arrow A in figure 2;

figure 4 shows a diagram of the calibration of the ends of the pipes.

A device for calibrating and straightening large diameter pipes contains a platform 1 fixed perpendicular to the straightening axis on a shaft 2 mounted in bearings 3 and provided with an electromechanical drive 4. The supports 3 and drive 4 are mounted on a support frame 5 kinematically connected to hydraulic cylinders 6.

Two three-roller heads 7, individually driven by a screw pair 8, are fixed on the platform guide 1 diametrically to the editing axis. Each three-roller head 7 consists of two external calibrating rollers 9 mounted on levers 10 kinematically connected to each other, having a common movement drive 11, for example from the hydraulic cylinder, and one internal calibrating roller 12 mounted on a lever 13 having an individual drive 14 for moving from the hydraulic cylinder.

On the platform guides 1 between the three-roller heads 7, two single-roller heads 15 with one internal calibrating roller 16 mounted on a lever 17 kinematically connected with an individual drive 18 of displacement from the hydraulic cylinder are also installed diametrically to the dressing axis.

Single-roller heads 15 are mounted on the guides of the platform 1 by means of frames 19 connected to screw pairs 20 and 21 for adjusting to the diameter of the pipes.

Additionally, a contact stop 22 and a sensor 23 for measuring ovality are installed on the platform 1.

To feed the pipe to the axis of the dressing serves as a transport roller table 24, rotary rollers 25 and a clamping mechanism 26 located in front of the device for calibration and dressing.

Each three-roller head 7 is installed in the guides of the platform 1 through the frame 27.

The device operates as follows.

The pipe 28 is transported by the transport roller 24 to the stop 22 and lowered onto the rotary rollers 25. Previously, the rotary platform 1 of the device is mounted on the dressing axis due to the hydraulic cylinders 6, also the three-roller and single-roller heads 7 and 15 are adjusted to a specific pipe diameter due to screw pairs 8, 20 21. In this case, the calibration rollers 9 are located outside the pipe, and the calibration rollers 12 and 16 are located inside the pipe. The rotary rollers 25 rotate the pipe and measure the ovality of the pipe end at a length of 200 mm by the sensor 23, and after measuring the ovality, the maximum axis of the pipe end oval is set in the horizontal plane according to the calibration scheme (see Fig. 4).

The installed pipe 28 is clamped by the clamp 26. The end of the pipe 28 is deformed by the external calibrating rollers 9 within the elastic deformation so that the maximum axis of the oval is located in a vertical plane. Then, with the internal calibration rollers 12 and 16, the pipe wall is compressed so as to create plastic deformations in the pipe on the external calibration roller 9 closest to the roller 16 and the internal calibration roller 12.

After creating plastic deformation in the pipe on the rollers 9 and 12, the platform 1 rotates from the drive 4. After several revolutions, the platform 1 stops, the external calibrating rollers 9 are relegated to the deformation step, and the internal calibrating rollers 12 and 16 are fed forward to the deformation step. After moving the calibrating rollers 9, 12, 16 and creating repeated plastic deformation on the indicated rollers 9 and 12, the platform 1 rotates from the actuator 4.

After several revolutions, the platform 1 stops and the calibrating rollers 9, 12, 16 are retracted to their original position. The clamp 26 releases the pipe 28, the rotary rollers 25 raise and rotate the pipe to control the ovality of the pipe end by the sensor 23.

The proposed device for calibration and straightening of large diameter pipes in comparison with the known ones will improve the quality of calibration and straightening and reduce the ovality of the ends of the pipes, which will facilitate the joining of pipes on the route.

Claims (3)

1. A device for calibrating and straightening the ends of large diameter pipes, comprising two three-roller heads having two external calibrating rollers and one internal calibrating roller with parallel axes and displacement drives, as well as two single-roller heads with one calibrating roller, each of which has, individual drive of movement on the diameter of the pipe, characterized in that it is equipped with a rotary platform with guides fixed to the axis of editing perpendicular to the axis of editing, three-roller heads are located iametralno relative changes in the axis of the platform by guide frames Idler head and mounted between three roller heads diametrically relative to the axis changes as a platform by means of guide frames. 2. The device according to claim 1, characterized in that each three-roller head is made in the form of two kinematically connected levers mounted on a frame, carrying external calibrating rollers and having a common displacement drive, and a lever carrying an internal calibrating roller with an individual displacement drive, while the eyebolts are installed in the guides of the platform. 3. The device according to claim 1, characterized in that each single-roll head is made in the form of a lever mounted on a frame carrying a calibrating roller and kinematically connected to the drive, the frames being located on the platform guides and provided with screw pairs for adjusting to the pipe diameter.

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