RU2727127C1 - Method for rolling of regular relief on inner surface of pipes and device for its implementation - Google Patents

Abstract

FIELD: technological processes.SUBSTANCE: invention relates to rolling of regular relief on inner surface of pipes. Finishing and regular relief with protective coating are made on inner surface of pipe. Self-hardening composition is uniformly distributed on finishing internal surface of pipe, and protective coating is applied into treated cavity of pipe and smoothed by means of rolling rolls. Regular relief is rolled by relief-forming roller on protective coating to create zones of variable elastic compliance. Height of elastic compliance zones during rolling is equal to height of relief elements formed by relief-forming roller. Number of zones during rolling of relief internal surface of pipe is equal to number of formed elements of relief.EFFECT: disclosed is method for rolling of regular relief on inner surface of pipes.3 cl, 3 dwg

Description

The inventions relate to the field of mechanical engineering, can be used in the formation of a regular relief on the inner surface of pipes.

There is a known method of processing the inner surface of workpieces such as pipes by surface plastic deformation of the workpiece with a broaching deforming multi-tooth tool with the formation of longitudinal protrusions and depressions on the surface to be treated and with the subsequent rolling of the protrusions until a regular relief is formed (USSR author's certificate No. 1549733 A1, priority date 02.11.1987, date publications 03/15/1990, authors: Drachuk A.V. et al., RU).

The disadvantage of the known analogue is the high energy consumption due to the deforming effect on the inner surface of the pipe.

As a prototype, a method was adopted for processing the inner surface of pipes using the well-known ANKORT technology, which provides anti-corrosion protection and high throughput of the pipeline, while the technology includes cleaning the inner surface with the creation of the necessary relief, heating to a predetermined temperature, applying the required number of layers of protective anti-corrosion coating to the relief surface , their curing and quality control (electronic resource: http://ankort.ru/storyl.php, date viewed 12/15/2019, prototype).

The disadvantage of the known method, adopted as a prototype, is the high energy consumption due to mechanical action on the inner surface of the pipe when creating the required relief.

A device for hydraulic pressing of pipes with internal spiral finning is known, containing a container with a matrix installed in it and a punch with a guide hole (USSR author's certificate No. 617149, priority date 09/17/1976, publication date 07/30/1978, author Efimov V.M., RU) ...

The disadvantage of the known device is the need to use large loads for plastic deformation of the metal and the application of relief.

There is a known device for restoring metal inner surfaces by static-pulse rolling, containing a mandrel, two diametrically opposite replaceable deforming tools fixed on radially located plungers, located on the central longitudinal axis of the mandrel, a waveguide and a striker in the form of rods, and the striker is designed to act on the waveguide to transmit a pulse load, a helical cylindrical compression spring is mounted on each plunger for applying a static load, the waveguide surface is made conical, in contact with the ends of the plungers, and a helical cylindrical compression spring is installed on the free end of the waveguide (RF Patent No. 2279961 C1, priority date 12.07.2005 , publication date 20.07.2006, authors: Stepanov Yu.S. et al., RU).

The disadvantage of this device is its complexity due to the large number of interconnected elements, as well as the high energy consumption of the process of surface static-pulse rolling.

As a prototype of the device, a reamer used in the known method of processing by surface plastic deformation of the inner surface of the part is adopted, while the centrifugal reamer is mounted on bearings in the tool holder of the machine and contains a disk with a shank and spring-loaded balls located on the periphery of the disk, contacting with the surface to be treated by means of a friction bond (RF patent No. 2557396 C2, priority date 06.12.2012, publication date 06.20.2014, authors: Sanaev N.K. et al., RU, prototype).

The disadvantage of the prototype device is its limited ability to create a regular relief and high energy consumption when implementing the rolling process.

The technical problem solved by the inventions is the need to expand the arsenal of technical means for rolling a regular relief on the inner surface of the pipes with the creation of a protective layer, providing an increase in productivity when implementing the method of applying relief and a decrease in energy consumption.

To solve the technical problem, a method is proposed for rolling a regular relief on the inner surface of pipes, including finishing and creating a relief with a protective coating on the inner surface of the pipe. The novelty is that the self-hardening composition is evenly distributed on the finished inner surface of the pipe, a protective coating is introduced into the processed cavity of the pipe, which is smoothed using rolling rollers, and a regular relief is rolled on the protective coating with a relief-forming roller with zones of variable elastic compliance, while the compliance of the zones in the rolling process is equal to the height of the relief elements formed by the relief-forming roller, and the number of zones during the rolling period of the relief inner surface of the pipe is equal to the number of relief elements formed.

According to the invention, the smoothing of the protective coating by rolling rollers and the rolling of a regular relief with a relief-forming roller are carried out simultaneously when they are fed and rotated around an axis coinciding with the axis of the fixed pipe.

To solve the technical problem, a device for rolling a regular relief on the inner surface of pipes is also proposed, designed to implement the claimed method. The device contains two rolling rollers cantilever mounted on a mandrel with a spring-loaded device for creating a force preload, a relief-forming roller is also rigidly installed on the mandrel, displaced from the rolling rollers in the opposite direction, while the relief-forming roller consists of a cylindrical elastic rim, covering a hub with a convex concave shaped surface.

In FIG. 1 shows a diagram of rolling a regular relief on the inner surface of a pipe using the inventive device mounted on a mandrel in a machine with a rotary-translational motion; in fig. 2 - section a-a in Fig. 1; in fig. 3 - node B in Fig. 2, which shows the embossing roller.

In the device for rolling a regular relief on the inner surface of pipes, the following designations are given:

1 - pipe;

2 - steady rest, in which the pipe is fixed:

3 - self-hardening composition;

4 - a protective coating, for example, in the form of an anti-corrosion polymer sleeve;

5 - shaft with mandrel;

6 - two rolling rollers, cantilevered on the mandrel;

7 - a spring-loaded device that exerts pressure on the rolling rollers;

8 - relief-forming roller, cantilever mounted on a mandrel with a constant distance from its axis of rotation to the axis of the mandrel;

9 - cylindrical elastic crown of the relief-forming roller;

10 - a hub with a convex-concave shaped surface;

11 - elastic zones of variable compliance;

12 - relief made on the inner surface of the pipe.

The method of rolling a regular relief on the inner surface of pipes using the method shown in FIG. 1 to FIG. The 3 devices are carried out as follows.

A self-hardening composition 3 is applied in a uniform layer on the inner surface of the pipe 1, fixed in the steady rest 2, according to the known technology [1]. The specified technology can be applied in the claimed method when used as a self-hardening composition of a more effective self-hardening mixture, in particular a polymer rubber-resin composition.

Further, a protective coating is introduced into the pipeline cavity using well-known technological methods described, for example, in [2], a protective coating, for example, in the form of an anticorrosive polymer sleeve 4, characterized, for example, in [3], interacting with a pre-formed layer of a self-hardening composition 3 before its curing ...

To evenly distribute the protective coating 4, two rolling rollers 6 are used, pressed against the coating layers 3, 4 on the inner surface of the pipe by the pressure of the spring-loaded device 7 and performing smoothing during the translational-rotational movement of the shaft 5.

When the shaft 5 rotates at a speed of c and its translational motion at a speed V (Fig. 1), the relief-forming roller 8 moves accordingly, while the position of the roller axis 8 is maintained at a constant distance from the axis of rotation of the shaft 5.

Regular relief 12 is rolled under the action of the force P (Fig. 3) on the protective coating 4 with a relief-forming roller 8, which creates elastic zones of compliance 11, while the compliance of zones 11 during rolling is equal to the height of relief elements 12 formed by the relief-forming roller 8, and the number of zones 11 for the rolling period of the embossed inner surface of the pipe 1 is equal to the number of relief elements formed 12. Under the action of the rolling force P and due to the variable elastic compliance of the roller 8, a variable plastic deformation occurs on the surface 4, as a result of which a regular relief 12 with a height R is formed (Fig. 3) ... Smoothing of the protective coating 4 with rolling rollers 6 and rolling of a regular relief 12 with a relief-forming roller 8 is carried out simultaneously when they are fed and rotated around an axis coinciding with the axis of the fixed pipe 1.

The technical result achieved by the implementation of the inventions consists in reducing energy consumption and in simplifying the technology of applying a relief on the inner surface of the pipe by using a device that provides variable plastic deformation of the protective layer applied to the inner surface of the pipe.

[1] http://ltk.svsokol.ru/usr/files/ru/techinfo/docs/gost/GOST_8_DIN_2614.pdf. date viewed 12/16/2019.

[2] RF Patent No. 2424116 C1. priority date 02.19.2010, publication date 07.20.2011, authors: Ibragimov N.G. et al., RU.

[3] http://www.gradiss.ru/services/bpis/sanatsia/. date viewed 12/16/2019.

Claims (3)

1. A method of rolling a regular relief on the inner surface of pipes, including finishing and creating a regular relief with a protective coating on the inner surface of the pipe, characterized in that the self-hardening composition is evenly distributed on the finished inner surface of the pipe, a protective coating is introduced into the processed cavity of the pipe, which is smoothed with the help of rolling rollers, and a regular relief is rolled with a relief-forming roller on a protective coating with the creation of zones of variable elastic compliance, while the height of the elastic compliance zones during the rolling process is equal to the height of the relief elements formed by the relief-forming roller, and the number of zones during the rolling period of the embossed inner surface of the pipe is equal to formed elements of relief. 2. The method according to claim 1, characterized in that the smoothing of the protective coating by rolling rollers and the rolling of a regular relief with a relief-forming roller are carried out simultaneously when they are fed and rotated around an axis coinciding with the axis of the fixed pipe. 3. A device for rolling a regular relief on the inner surface of pipes, designed to implement the method according to PP. 1, 2, characterized in that it contains two rolling rollers cantilever mounted on a mandrel with a spring-loaded device to create a force interference and a relief-forming roller mounted cantilever rigidly on the mandrel and offset from the rolling rollers in the opposite direction, while the relief-forming roller consists of a cylindrical an elastic rim, covering a hub with a convex-concave shaped surface.

Images