RU17459U1 - PIPE BENDING MACHINE - Google Patents

Description

Pipe bending machine.

The utility model relates to the processing of metals by pressure and can be used for the manufacture of bent thin-walled, including multi-pipe, with a change in the plane of bends, where the formation of corrugations during bending is unacceptable, and also where it is necessary to preserve the geometry of the bent pipe in cross sections of bending at high steepness of a bend.

Known machines and other equipment for bending pipes of different diameters.

JP patent No. 2715397 B 2 9103825 A dated 09.10.95, the mechanism of rotation of the matrix in the device for bending by pushing. It describes a device with a guide cylinder for a tubular billet, which has a matrix inserted into the cylinder, having a spherical lateral surface and designed to grasp a portion of the billet, and a matrix holder passing through the cylinder by means of a support section for rotating the matrix. The device performs the bending operation by pushing the billet while creating the offset matrix.

However, the device does not provide bending of a thin-walled pipe with a small radius, since there is no tension in the bending zone and there is no bending mandrel inside the tube-like element.

There is also a known mechanism for a manual bending device, US patent No. 5819581 A dated 03/07/97. The mechanism works on the principle of running-in. Contains a break-in roller and a roll-in roller. In addition, it has a pipe clamping mechanism in front of the break-in roller.

However, it does not provide bending of a thin-walled tube billet with a small radius of curvature, since this design does not provide for the extension of the tube billet in the bending zone and the presence of a bending mandrel inside the pipe in the bending zone.

Also known patent US No. i 5802898 - pipe bending machine. It contains an internal bending matrix having a curved surface of the first radius, a movable block that clamps the pipe billet between its inner surface and the curved surface of the matrix, a fastener for the first part of the pipe on the inner matrix, a node for restricting the block when moving around the axis of the matrix surface along the arc of the second radius, as well as a device for generating hydraulic pressure in the cavity of the pipe billet and for isolating this cavity when the hydraulic fluid is supplied, which plays It plays the role of a mandrel in the process of bending a pipe billet and prevents distortions in the geometry of the manufactured product.

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This design of the machine allows you to get a bend of a thin-walled pipe with a small bend radius without corrugation, however, the use of hydraulic pressure in the cavity of the pipe billet and isolation of this cavity are associated with great structural difficulties, which leads to the high cost of this machine. In addition, the machine does not provide multi-pipe with a change in the plane of the bends.

The closest analogue is the machine for bending pipes, USSR patent No. 222858 of 11.16.1964. It contains a bed and a coiling mechanism installed on it, a mandrel - a mandrel and a mandrel drive, which serves to introduce and view the latter when bending pipes of large lengths and diameters.

However, the machine does not provide a steeply bent bend on a thin-walled pipe, since this cannot be accomplished without forcing the tube-like element in the bending zone to be forcibly stretched.

The objective of the utility model is to develop a pipe bending machine with improved bending quality, namely, at small bending radii for thin-walled pipes, preserving the pipe geometry in cross sections, with the ability to perform several bent sections, including with high steepness with a change in the plane of the next bend without corrugation formation.

The utility of the utility model lies in the fact that in the pipe bending machine containing the bed, a bending mechanism is installed on it, the elements fixing the workpiece, the mandrel mandrel, the drive connected to it, consisting of a hydraulic cylinder with a pin, the mandrel mandrel drive is made with the possibility of reciprocating movements, locking elements are equipped with jaws, one pair of which serves to clamp the tube-shaped workpiece and is rigidly fixed to the bed, the other couple - to stretch the tube-shaped workpiece, and the bending mandrel is made with oyaschey of the flexible cable associated with the intermediate ball-shaped elements sleeves between them, the front end of which is formed an elastic member, and the opposite end secured to the mandrel schtoku gidrotsshshndra, which is its actuator.

In addition, a variant of the machine for bending pipes is claimed, which, in addition to the nodes and parts listed above, has an additional mechanism for turning the plane of the bend, which is made in the form of a worm gear with an electric drive.

Another variant of the machine for bending pipes, which, in addition to all of the above features, has a linear pipe-shaped movement mechanism, is claimed.

billets made in the form of a ball screw connected to a mechanism for turning the plane of the bend.

The inventive utility model is illustrated using FIG. 1-4, where FIG. 1 is a general view of a pipe bending machine; FIG. 2 is a general view of the bending mechanism, FIG. 4 is a general view of the mechanism of rotation of the bending plane, FIG. 3 - General view of the bending mandrel at the time of bending, where pos. 1-38 marked the nodes and details of the inventive machine for bending pipes.

The inventive machine for bending pipes (Fig. 1) consists of a bed 1 of horizontally elongated box-shaped structure, on which its main components and mechanisms are mounted, the bending mechanism 2, the rotation mechanism of the bending plane 3, the linear movement mechanism of the workpiece 4, the linear movement mechanism drive 5, Schmindric guides 6, a bending mandrel 7, mounted on the front end of the flap 8 of the hydraulic cylinder 9, which is the drive of the latter, which is mounted on the bracket 10. Inside the frame 1 is the hydraulic station of the machine 11.

The mechanism of bending 2 (figure 1) of tube-shaped blanks is presented as follows. A bending beam 13 for bending rotation mounted on rolling bearings is mounted on a vertical axis 12. The bending beam 13 is pivotally connected to the hydraulic cylinder of the bend 14, which ensures the rotation of the beam 13, and accordingly the bending of the pipe at a given angle. Above the bending traverse 13, on the axes emerging from it, bending jaws 15.16 are attached, providing gripping and stretching of the tube-like workpiece during bending. In the same plane with the bending jaws 15, 16 on the arm 17 of the hydraulic cylinder of the bend 14 are located the hydraulic cylinders 18, 19 with the jaws 20, 21 of the rigid clamp of the tube-shaped workpiece. Above the bending lips on the axes emerging from the bending beam, there is a hydraulic cylinder 12 for clamping the bending lips 15, 16, acting on one of the jaws by means of an eccentric on the axis. Above them, the axles are interconnected by a rigid bar 23. Above this bar is a hydraulic cylinder 24, which controls another bending sponge. At the end of one of the axes, a sensor 25 for controlling the bending angle of the workpiece with a lever 26 for acting on it is attached. The principle of operation of the bending mechanism is based on the forced stretching of a given section of the tube-like workpiece between the jaws 20.21 of its rigid clamp and the bending lips 15, 16. For the mechanism to work in an automatic cycle, the following movements are required: independent rotation of the bending jaw 16 around axis 12 by the required angle to return it to its original position, lagging behind the return of the jaw 15 clamping the workpiece. This movement is necessary to preserve the obtained bend of the tube-shaped workpieces without bend defect defects. For work opportunity

it is necessary to perform the following actions: to clamp the workpiece in the tough jaws 20, 21 before bending and to clamp it in the bending jaws 15, 16 after bending for tension. To implement the last action, it is necessary to rotate the bending jaws 15.16 around the axis 12 of the bend of the tube-shaped workpiece.

To obtain the bend of the tube-shaped workpiece while maintaining the shape of the latter at the bend, a bending mandrel 7 (Fig. 1) is used, working on the principle of smoothing irregularities. To accomplish this task, the bending mandrel 7 is located in the bending zone coaxially with the bending mechanism 2 and is a set of spherical elements 27 (Fig. 3) located at a given distance from each other due to the sleeve 28 with two internal spherical surfaces (lodges) located on the ends connected by a flexible connection 29, which can be used as a cable, chain, turf rod, etc. To compensate for the elongation during bending, the bending mandrel 7 (Fig. 1) at the front end contains an elastic element ent 30 (Fig. 3), and the flexible connection contains a hard seal 31. The opposite end of the bending mandrel contains a threaded sleeve 32, necessary for fastening the latter to the pin 8 (Fig. 1) of the drive of the bending mandrel 9. In addition, the threaded sleeve 32 (Fig. . 3) the threaded end of the seal 33 of the flexible connection 29 is wrapped, which ensures the assembly of a set of spherical elements 27 with a preload. The bending mandrel 7 (Fig. 1) is mounted on the threaded end of the pin 8 of the drive of the bending mandrel 9, which controls the operation of the latter and provides the following functions: entering the mandrel into the bending zone and from there, as well as reciprocating movement of the mandrel during bending of the tube-like workpiece . The drive of the bending mandrel can be, for example, a hydraulic cylinder located on the bracket 10 behind the bending mechanism 2.

To obtain a tube-shaped part with n - the number of bends located in any spatial planes, with straight sections between the bends, the tube-shaped workpiece must be fed forward by a given linear value after the bend, then rotated by the required angle to change the plane of the bend, and then perform the subsequent bend . All the functions described above are realized by the following mechanisms: the mechanism of linear movement of the workpiece 4 (Fig. 1) and the mechanism of rotation of the plane of the bend 3.

The mechanism for the direct movement of the workpiece 4 is a screw-type drive with a rotation drive 5 from a DC motor through a gearbox, which serves to increase the torque on the screw if necessary speed

moving the workpiece. It is rigidly connected by a movable, in a linear direction, element with a mechanism for turning the plane of the bend 3.

The mechanism of rotation of the plane of the bend 3 (Fig. 1) serves to secure the tube-shaped workpiece in the machine and to rotate the latter around its axis at any angle. For linear movement of the mechanism, it is executed on two slotted guides 6 (Fig. 1). The mechanism of rotation of the plane of the bend 3 (Fig. 1) contains: a spindle 34 (Fig. 4) with a collet fastening the tube-shaped workpiece 35, a worm gear 36 with a rotation drive from a DC motor, a rotation drive of the collet 37, made in the form of a plate spring, drive rafts of the collet 38, made in the form of a hydraulic cylinder acting on the collet 35 at the time of replacement of the tube-shaped workpiece. Separation of the collet clamp drive 37 with the collet opener 38 ensures constant clamping force of the workpiece regardless of the hydraulic system and the normal operation of the hydraulic cylinder 38, since when the collet 35 is clamped by one hydraulic cylinder 38, the latter should be rotated around the axis to change the plane of the bend, which entails unjustified oil leakage and loss of clamping force.

An example of a pipe bending machine. Illustrated using FIG. 1, FIG. 2 and FIG. 4. Hydraulics are turned on and the mechanisms are returned to their initial positions: the bending mandrel 7 (Fig. 1) in the retracted position, the pipe clamp lips 20, 21 (Fig. 2) on the bending mechanism 2 (Fig. 1) are opened, the eccentric of the bending sponge 15 ( Fig. 2) the mechanism is open, the jaws of the bend 15, 16 are open and in the initial position, the collet 35 (Fig. 4) is opened under the influence of the hydraulic cylinder 38, the linear movement mechanism of the workpiece 4 (Fig. 1) entered the collet 35 (Fig. 4) to the zero position. Then, a workpiece — a pipe — is inserted into the device and the collet 35 is closed. The bending mandrel 7 (Fig. 1) is brought out to its initial forward position. Close the jaws 20, 21 (Fig. 2) of the pipe clamp on the bending mechanism 2 (Fig. 1). Turn on the reciprocating movement of the bending mandrel 7. Close the lips of the bend 15, 16 (Fig. 2) by an eccentric of the bending mechanism 2 (Fig. 1). Turn on the bending mechanism and bend the pipe to a predetermined angle. Upon reaching the desired value of the angle of bending, the bending mechanism 2 (Fig. 1) is turned off. Bending mandrel 7 (Fig. 1) completes the movement and returns to its original extreme position. The jaws of the bend 15, 16 (Fig. 2) are opened by an eccentric of the bending mechanism 2 (Fig. 1) and the left jaw 15 (Fig. 2) is moved to its original position, then the jaws of the rigid pipe clamp 20, 21 (Fig. 2) are opened on the mechanism bend 2 (Fig. 1). Turn on the mechanism of linear movement of the workpiece 4 (Fig. 1) and move the workpiece by a predetermined linear value. Include

the mechanism of rotation of the plane of the bend 3 (Fig. 1) and rotate the workpiece at a given angle. After this, the steps necessary to obtain a bend on the pipe are repeated. In the final manufacture of the details of the jaw 15,16,20,21 (Fig. 2) of the bending mechanism 2 (Fig. 1) are open, the bending mandrel 7 is retracted to the extreme position. The collet 35 is opened (Fig. 4) and the finished part is removed from the machine.

The pipe bending machine (Fig. 1) of the claimed design provides bending of a thin-walled tube-like element without corrugation with a small bending radius with the possibility of obtaining several consecutive bends on the tube billet and with a change in the plane of the bend before each subsequent bend.

A distinctive advantage of the claimed utility model is its compliance with conflicting requirements: on the one hand, according to 11, the study of bending on a thin-walled pipe with high steepness of the latter and, on the other hand, obtaining several successive bends that are separated from each other by a given distance, with the possibility of changing the plane of the bend of the tube-like element .

The claimed machine is successfully tested at a number of enterprises.

Claims (3)

1. A pipe bending machine, comprising a bed, a bending mechanism mounted on it, billet-fixing elements, a mandrel mandrel, a drive connected to it, consisting of a hydraulic cylinder with a rod, characterized in that the mandrel mandrel drive is made with reciprocating motion, the fixing elements are equipped with jaws, one pair of which serves to clamp the tube-shaped workpiece and is rigidly fixed to the bed, the other couple - to stretch the tube-shaped workpiece, and the bending mandrel is made up of connected flexible with a cable of spherical elements with intermediate bushings between them, on the front end of which an elastic element is made, and the opposite end of the mandrel is attached to the rod of the hydraulic cylinder, which is its drive.  2. The machine according to claim 1, characterized in that it has a mechanism for turning the plane of the bend and is made in the form of a worm gear with an electric drive. 3. The machine according to claim 2, characterized in that it has a linear movement mechanism of the tube-shaped workpiece, made in the form of a ball screw connected to a mechanism for turning the plane of the bend.