RU2537636C1 - Device for obtaining corrugated pipes - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: shaping node contains profiling element in the form of membrane and one or several profiling ring lugs connected to it, the membrane is installed with possibility of bending to ensure turn of these profiling ring lugs and their introduction to the pipe from inside, and the membrane is connected to one end by stock designed with possibility of movement along longitudinal axis.

EFFECT: enlarging manufacturing capabilities.

2 dwg

Description

The invention relates to the field of metal forming, in particular to the production of shaped pipes.

A device for corrugating shells according to the patent of the Russian Federation 2121406 C1 is described, which describes a solution that allows profiling corrugated pipes on pressure-rolling machines. The device carries out profiling using toroidal rollers on a split mandrel with a wavy outer profile.

The disadvantage of this device is the relatively low profiling speed (since each of the corrugations of the profile is formed in one revolution of the device), in addition, obtaining some types of profile, for example intermittent, is difficult, and adjusting the depth of profiling requires replacing the mandrel.

Also known is a device for forming radially corrugated pipes of the bellows type, described in the patent of the Russian Federation 2176941 C2 from 12.20.2001. The device contains an axially detachable matrix, on the inner surface of which there are protrusions and depressions that repeat the profile of the bellows, and a punch, in the lateral surfaces of which annular grooves are made with elastic forming elements located in them and connected by radial and axial channels with a pressure source. The number of elastic forming elements is equal to the number of depressions on the matrix.

The disadvantage of this device is the presence of elastic elements having low resistance and strength, which limits the applicability of the device to obtain pipes with corrugations of small height and a smooth profile. In addition, the low strength of the elastic elements from rubber leads to an increased cost of profiling due to the need for relatively frequent replacement of elastic elements having a complex configuration. Obtaining pipes of long length is difficult or impossible.

A device for corrugating pipes according to the patent of the Russian Federation 2148458 from 08/17/1998, containing a mandrel for installing the tube billet and a forming unit including an elastic punch, a power cylinder to create a working force on the punch, a profile split matrix, a sequential feed tube billet with a power cylinder, hydraulic system with controls and a number of auxiliary mechanisms.

The disadvantages of the device include the complexity of the mechanism, which has separate nodes for obtaining a preliminary and final profile, which reduces the reliability of the device as a whole. In addition, preliminary profiling is carried out by an elastic element with significant deformations, which suggests its low resistance to multiple profiling operations.

As a prototype, a device for producing corrugated pipes according to the patent of the Russian Federation 2468878 C1 of December 10, 2012, comprising a forming unit including a cylinder for generating a working force and a profiling element, as well as a pressure supply system with control elements, characterized in that the cylinder body is made with the ability to install in the pipe and move, while the profiling element is made in the form of a metal membrane and associated with it one or more profiling ring protrusions, and the metal membrane is fixed ene on the body of said cylinder with the possibility of flexing outwardly under the action of pressure to ensure the rotation of said profiling annular projections and their introduction inside the pipe.

The disadvantages of the prototype include the need to create significant pressure in the cylinder when profiling pipes with a thick wall, as well as the difficulty or impossibility of profiling pipes with a small diameter, since this also reduces the diameter of the device, and hence the diameter and area of the membrane, which also requires for pressing the protrusions devices for creating significant pressures in the cylinder. In addition, to control the indentation depth of the protrusions (profiling depth), it is necessary to create different pressures in the cylinder, and the dependence of the indentation depth on the pressure can be nonlinear, and it can be difficult to achieve a constant required depth.

The objective of the invention is to provide a device having the ability to obtain corrugated pipes with any selected profiling depth in a certain range, profiling pipes with small diameters.

The problem is solved by creating a device for producing corrugated pipes containing a forming unit, including a profiling element in the form of a membrane and one or more profiling annular protrusions connected to it, the membrane being installed with the possibility of bending to ensure rotation of the said profiling annular protrusions and their introduction from the inside into the pipe.

New in the device is that it is equipped with a rod, made with the possibility of movement along the longitudinal axis, one end of which is rigidly connected to the membrane.

The above technical solution allows to obtain corrugated pipes with an arbitrary profile depth, and the profiling depth linearly depends on the movement of the rod. At the same time, it is possible to create an arbitrary force on the rod, which allows you to bend the membrane even with a small diameter of the device, which means that you can profile the pipes of small diameter.

The device is shown in figure 1 (initial state - when installed in the pipe and moving) and figure 2 (operating state).

The device (FIGS. 1, 2) comprises a forming unit consisting of a housing 1 with a fixing nut 2, by means of which a membrane 3 is fixed on the housing (for example, by tapering it) and the associated annular protrusions 4. A rod is rigidly connected to the membrane 7. The housing 1 is attached to the hollow rod 5 to move along the profiled pipe 6. In order to reduce the force on the rod and if this is permissible according to the requirements for the finished pipe, the protrusions 4 can be made split in the form of a collet, which reduces their resistance to bending of the metal membrane 3.

A device for producing corrugated pipes works as follows. By moving the rod 5, the device is fed to the site of profiling. After the device is correctly positioned, the rod 7 is moved by a predetermined amount by means of a mechanical device (for example, a screw drive or a pair of gear-rack). In this case, the metal membrane 3 under the action of the rod is bent, and the associated profiling projections 4 are rotated and embedded in the profiled pipe 6 from the inside, forming an annular protrusion on its wall. By adjusting the amount of rod movement, it is possible to control the profiling depth, and by changing the profiling unit (membrane 3 with protrusion 4) - the shape of the finished pipe. After the profiling of one profile element is completed, the rod 7 is moved to its original position and the device on the rod 5 is moved to a new position, after which the process is repeated. Profiling can be carried out both in the low-speed (moving the rod to the working position - in the initial position - moving the device, etc.), and in high-speed mode (pulsating rod movement and synchronized with pulsations moving the device relative to the pipe, for example, using step drives ) In addition, when profiling short sections, the method of profiling a pipe by the proposed device using an external split matrix can be used.

In contrast to devices that include roll profiling, it is possible to obtain an intermittent profile, a profile with a complex pattern. In addition, from devices using elastic elements, the proposed design is favorably distinguished by the increased resistance of the profiling element, as well as the possibility of obtaining a profile with sharp outlines. A positive difference from devices that provide profiling on the mandrel or in the matrix is the possibility of obtaining corrugated pipes and bellows of great length, limited only by the length of the hollow rod.

In general, the advantages of the proposed device are its high versatility in the form of the protrusions obtained, their depth, the length of the pipe, the pipe materials used, the sufficient performance of the device when using high-speed displacement drives and pressure supply devices, and the possibility of obtaining randomly alternating profile and non-profiled sections on the pipe, which may be important when using products as heat transfer tubes. In addition, the device is able to profile pipes of small diameter and relatively large thickness, since the force on the rod is limited only by its strength and stability in a small free area near the membrane.

Claims (1)

A device for producing corrugated pipes, comprising a forming unit including a profiling element in the form of a membrane and one or more profiling annular protrusions connected to it, the membrane being bent to allow rotation of said profiling annular protrusions and their introduction from the inside into the pipe, characterized in which is equipped with a rod made with the possibility of movement along the longitudinal axis, one end of which is rigidly connected with the membrane.

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