SU1731353A1 - Pipe-bending device - Google Patents

Abstract

Use: for bending pipes from sheet blanks. SUMMARY OF THE INVENTION: The device comprises a groove mandrel mounted on a frame with the possibility of reciprocating movement along a bending axis. Interchangeable sleeves are placed on the mandrel, in which grooves are made that are identical to the mandrel grooves. The frame is fixed symmetrically to the axis of the mandrel with the possibility of reciprocating movement perpendicular to the axis of the bending elements and means for bending and centering the pipe. The latter is made in the form of a support with rollers located on it with the possibility of radial movement, which periodically interact with the pipe and mandrel. The pipe is moved by means of a removal mechanism made in the form of two prisms connected by a sleeve-remover, which are located in the slots of the mandrel with the possibility of reciprocating movement along the bending axis. The prisms are moved by a drive made in the form of a flexible traction organ. 1 hp f-ly, 3 ill. e

Description

This invention relates to mechanical engineering, in particular to bending devices.

A device for flexible shells and pipes is known, which is a sheet bending roller machine containing three rotating rolls installed in a staggered order, with the rear bearing of one of the rolls being foldable so that it can be removed from the closed shell device 1.

The disadvantages of this device are low productivity due to the need for pre-bending the edges of the sheet on both sides and the inevitability of either bending or under-bending the edges due to the differences in strength characteristics in the bent blanks. In addition, to eliminate the ovality after welding, the shell (pipe) is subjected to straightening on a bending machine.

The closest in technical essence to the claimed technical solution is a device for bending shells and pipes, which is installed in guide frames with the possibility of reciprocating movement in the direction perpendicular to the axis of the frame, on which the drive is made, made in the form of beams associated with the power cylinders, as well as the mechanism for fixing the workpiece, made in the form of a screw

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clamping and two rollers mounted on the beams at a given distance from each other, while the mandrel is equipped with a mechanism mounted on it to remove the bent product. The mechanism for removing the bent article is made in the form of a removable ring placed on the mandrel, connected by means of a pulley with a drive. The device is equipped with a mechanism for bending the ends of the workpieces mounted on a frame under the mandrel, made in the form of a slide with a spherical concave working surface. It is also provided with a table and an inclined frame for receiving article 2.

The disadvantages of this device are inability to bend lengthy products, since the frame is driven from a single hydraulic drive, which leads to a misalignment of the movable frame, the low efficiency of hemming of the edges of the slider due to the lack of possibility of its action on the workpiece within plastic deformations. In addition, when bending lengthy blanks, the drive mechanism for removal (hydraulic cylinder) increases significantly in size.

The purpose of the invention is to expand the technological capabilities of the device by providing flexible long products and improving the quality of finished products.

The goal is achieved by the fact that a self-centering mandrel support is mounted on the device bed in contact with the product by means of rollers placed on moving support elements moving in the radial direction, and the mandrel has a shoulder in the radial direction at a certain distance from the cantilever section. products to the required sizes. The presence of interchangeable sleeves with through grooves located on the mandrel, which are identical to the mandrel grooves, allows the use of a device for bending long products.

FIG. 1 shows a general view of the device; in fig. 2 shows section A-A in FIG. one; in fig. 3 shows a section BB in FIG. one.

The pipe bending device comprises a frame 1 on which four cylindrical guides 2 with cutted rails are attached to the gears of the drive mechanisms 3, kinematically connected with the hydraulic drive mechanism 4, the drive mechanisms 3 and the hydraulic drive mechanisms 4 being rigidly fixed frame 5 mandrel 6, hard

associated with the frame 1 on the one hand and in contact with the support 7 by means of rollers 8 on the other hand. Mandrel 6 is a hollow cylinder having

the entire length of two diametrically spaced groove rectangular configuration. At a certain distance, to the end of the cantilever section, the mandrel 6 has a step 9 in the radial direction, providing

0 the possibility of bending the product to the desired size. The mandrel 6 is equipped with a detachment mechanism consisting of two prisms 10, kinematically associated with a chain drive 11, onto which 5 additional prisms 12 are screwed, used in conjunction with interchangeable sleeves 13, which mate with mandrel 6 for bending pipes of various diameters and connected by a sleeve-stripper 14 (corresponding to the standard size of a replaceable sleeve 13). The bending elements 15 are located along the axis of the mandrel 6 and are located on both sides of its vertical axis, they are made to move in the horizontal direction towards each other and kinematically through rail gears 16, the bodies of which are fixed to the frame 5, associated with pneumatic actuators, 17 . The fixation mechanisms 18 are located

0 on bed 1 and is brought to the working position from the hydraulic actuators.

Bearing 7 consists of two self-centering three-jaw chucks 19, on the cams of which rollers 8 are placed,

5 and each of the cartridges has an autonomous drive.

The frame 5 also contains roller supports 20 for moving and fixing the sheet blanks 21 moving to the movable stops 22.

The device works as follows.

Sheet blank 21 is fed by roller supports 20 to movable limiters 22, which are pre-positioned so that the blank 21 is located exactly in the middle relative to the mandrel 6. Then the fixation mechanisms 18 are activated, pressing the blank 21 to the mandrel. After that, the mechanism of the hydraulic actuator 4 is turned on, which moves the frame 5 along the cylindrical guides 2 upwards, while the bending elements 15 under the influence of vertical forces of the movable frame 5 and the efforts of the pneumatic actuators 17 bend the sheet 21 around the mandrel 6. Subsequently, the bending elements 15 remain in the upper position, covering the product, the fixation mechanism 18 returns to its original position. The removal, bending, and welding operations are performed. This happens as follows. The chain drive 11 of the mechanism for removing the product is turned on, and the sleeve-puller 14, resting against the left end of the product (Fig. 1), begins to move it towards the support 7. At the same time, the rollers 8 of the left cartridge are disengaged, and the rollers 8 of the right cartridge contact with the mandrel 6, then after passing the product through the left cartridge, the rollers 8 of the left cartridge are closed onto the product, the rollers 8 of the right cartridge are diluted by the size of the outer diameter of the product, after passing the product through the right cartridge, the process of bending the product 8 rollers 8 of the left cartridge, which reduced to a size that provides additional deformation of the product, allowing to obtain a longitudinal joint of the edges of the product, suitable for welding. After the product passes the right end of the mandrel 6 by means of the sleeve-remover 14 outside the support 7, the joint of the product is welded. In this case, it is possible to disconnect the chain drive 11 in order to drive the joint welding on the stationary product.

After removing the product from the mandrel 6, the frame 5 is moved to its original position, the puller sleeve 14 returns to the left (in FIG. 1) side of the mandrel 6.

Claims (2)

Claim 1. Device for bending pipes containing mounted on the frame with the possibility of the reciprocating movement along the axis of the flexible mandrel, symmetrically located relative to the axis of the mandrel with the possibility of reciprocating movement perpendicular to the axis of the flexible bending elements, kinematically associated with the drive, the mechanism of fixation of the workpiece, the mechanism for removing the workpiece, characterized in that technological capabilities by providing flexible long products and improving the quality of the finished product, it is equipped with a means for centering and bending the pipe, you filled in the form of a support rigidly fixed on the frame, positioned on the support with the possibility of radial movement relative to the axis of bending and with the possibility of periodic interaction with the mandrel with rollers for bending the pipe, with the grooves and the radial shoulder on the mandrel, and the workpiece removal mechanism is in the form of said mandrel slots with the possibility of reciprocating movement along the axis of bending of two prisms, kinematically connected with a drive made in the form of a flexible traction organ, and Indens among themselves by means of the plug-in puller. 2. The device according to claim 1, characterized in that it is provided with interchangeable sleeves with through grooves placed on the mandrel, which are located identical to the mandrel grooves. eleven / 7 Aa fig.2 Rig.Z