Method of and device for expanding large diameter pipes

FIELD: plastic metal working.

SUBSTANCE: invention can be used for sizing welded pipes of large diameter by expanding. Proposed method includes feeding of pipe cyclically at preset step to sizing tool of expander and its expansion at each cycle by means of sizing tool. During cycle which follows first cycle pipe is turned through angle whose value corresponds to value of deviation of pipe axis from straightness on section whose length is equal to pipe feed step at each cycle of expanding. Device is provided with holder with rollers on end face of sizing tool, axis of rotation of holder coincides with axis of sizing tool. Rollers are installed for movement in radial direction.

EFFECT: improved quality owing to provision of stability of geometric dimensions.

3 cl, 1 ex, 3 dwg

 

The invention relates to metal forming, and more specifically to calibration of welded large diameter pipes by hand (expansion).

Known solutions the closest to the technical essence is a way of expansion of large diameter pipes including supply of calibrating tool expander inside the pipe to the appropriate length (step), distribution (expansion) of this section lengths by using the calibrating tool, removal efforts of expansion and submission tool on the next step (U.S. patent No. 6253596, CL 72-370 .08, Appl. 20.01.97,, publ. 3.07.2001 year).

A device for implementing this method includes calibrating the instrument (expandyour head) mechanical expander attached to the rod, the clamping device in the form of two rollers (or several pairs of rollers), set the expander, and an exciting opposing the expansion pipe end device that allows you to raise, lower and rotate, and slide the pipe on the calibrating tool.

The opposite of the calibrated pipe end lift is lowered vertically, or rotate around a transverse axis to create a pre-stress to avoid bending.

The disadvantage of this method and device is that it does not provide adequate stability of the geometry of the definition of the dimensions of the pipe in the that the pipe is supported only on the ends and under the action of its own weight will have a significant deflection, which is not corrected in the expansion.

The present invention is to provide a method and device for its implementation, to improve the quality of the pipes due to the stability of the geometric dimensions.

This object is achieved in that in the method of the expansion of large diameter pipes, including cyclic with a given step of the supply pipe on the calibrating tool expander and its distribution in each cycle using a calibration tool according to the invention in each of the following after the first cycle by turning the tube on an angle whose magnitude corresponds to the magnitude of the deviation from straightness of the pipe axis on the plot, the length of which is equal to the pitch of the pipe at each cycle of expansion. The value of the angle set with the bend of the pipe from the effects of mass calibration expander tool.

A device for carrying out the method containing the calibrating tool of the expander and trolley mechanism stepper feed pipe according to the invention on the end of the calibrating tool is additionally mounted on the cage with rollers mounted for movement in a radial e.g. is the pressure, thus the axis of rotation of the shroud is aligned with the horizontal axis of the calibrating tool.

This embodiment of the method of expansion of large diameter pipes and the proposed design, the device can improve the quality of the pipes due to the stability of the geometric dimensions due to the fact that corrected, both in diameter and length, the geometry of the pipes with different initial defects, since the rotation of the pipe by an angle value which takes into account the geometry defects are inevitable in the process of redistribution, and the deflection of the pipe from the effects of mass calibrating tool expander, restore the straightness of the axis.

To illustrate the invention the following is a specific example of carrying out the invention with reference to the accompanying drawings, on which:

figure 1 - shows a device for the expansion of large diameter pipes, General view;

figure 2 - section a-a in figure 1 (for the same diameter pipe);

figure 3 - cross-section B-B in figure 1 (for different diameter pipes).

Device for expansion of large diameter pipes consists of expander 1 calibrating tool 2, for example calibrating head with a number of radially movable segments, located on a circle and has a profile of the internal surface of a pipe (not shown), and the transport unit 3 the mechanism of the stepper feed pipe.

At the end of the calibrating tool 2 mounted on the holder 4 with the rollers 5 mounted for movement with the hydraulic actuator in the radial direction. The axis of rotation of the cage 4 is aligned with the horizontal axis Oh calibrating tool 2 and expendirures pipe 6.

Transport trolley mechanism 3 stepper feed pipes are fitted kantowski rollers 7 with reverse rotation and mounted on the supports 8, which can change its position according to the height and to change the distance between them.

Pipe 6 of large diameter which is subject to expansion, is placed on the carriage 3 of the feed mechanism and move it to the bounds of the first step of expansion.

The initial pipe section 6 pull on the calibrating tool 2, which is in a flattened condition. After stopping the truck 3 with the pipe 6 calibrating tool 2 increase in diameter and distribute the initial pipe section 6.

After attaining the specified size ekspandiranega pipe section diameter of the calibrating tool 2 reduce to the original. Then the pipe 6 with the truck 3 is moved to the border of the next step. Then push the roller holder 4 in the touch roller 5 with the inner surface of the pipe and turn on the angle, the value of which corresponds to the deviation from straightness of the axis on teaching is TCE, the length of which is equal to the pitch of the pipe at each cycle of expansion, taking into account the deflection of the pipe from the effects of mass calibration expander tool.

Next cycle supply - distribution is repeated.

Example. Steel welded pipe 6 with a diameter of 1420 mm with wall thickness of 18.7 mm is placed on the carriage 3 of the feed mechanism. Mounted on the carriage 3 pipe 6 cycles with specified spacing a=1 m serves on the calibrating tool 2 of the expander 1 and distribute it in each cycle. Before the cards are dealt in each of the following after the first cycle (if necessary - if the deviation is not equal to 0), the pipe 6 is turned at an angle with kentoushi rollers 7 with extended roller cage 4, and the rollers 5 are in contact with the inner surface of the tube 7. Determination of the angle of rotation is performed by means of a device (not shown), such as optical, which determines the amount of deviation from the ideal to the longitudinal axis of the pipe on separate sites, each of which is equal to the pitch of the pipe at each cycle of expansion. Next, using the computing device is re-calculated angle of rotation and the command to the casting-off of the pipe. The computing device is the value that takes into account the deflection of the pipe from the effects of mass expandida head with a calibrating tool.

The proposed method of expandi the Finance of large diameter pipes and device for its implementation compared with the known, help to improve the quality of the pipes due to the improved geometry of the pipe, namely giving it a perfect shape as the diameter and along the longitudinal axis.

1. The way of the expansion of large diameter pipes, including cyclic with a given step of the supply pipe on the calibrating tool expander and its distribution in each cycle by using a calibrating tool, characterized in that in each of the following after the first cycle by turning the tube on an angle whose magnitude corresponds to the magnitude of the deviation from straightness of the pipe axis on the plot, the length of which is equal to the pitch of the pipe at each cycle of expansion.

2. The method according to claim 1, characterized in that the value of the angle set with the bend of the pipe from the effects of mass calibration expander tool.

3. Device for expansion of large diameter pipes containing the calibrating tool of the expander and trolley mechanism stepper feeder, characterized in that on the end of the calibrating tool is mounted a cage with rollers mounted for movement in the radial direction, while the axis of rotation of the clip coincides with the axis of the calibrating tool.



 

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