RU31630U1 - Pipe bending device - Google Patents

Description

Pipe bending device

The invention relates to the processing of metals by pressure, and in particular to structures of devices (hand nresses, dies) for bending pipes with a large bending radius.

A known strain design for the manufacture of curved bends according to A.S. No. 1174115.

A disadvantage of the known stamp design is that the stamp provides bends with a bending radius of less than one and a half diameters, R 1.5 D, requires the use of a press and does not allow bending of pipes with R 5 D.

Known designs of pipe benders for bending pipes with a diameter of up to 2 (see A.I. Galperin. Machines and equipment for bending pipes, M., "Mechanical Engineering, 1967, pp. 69-72, Fig. 42 and Fig. 44). Machine tools provide pipe bending on two supports

(rollers) with bending radius up to five pipe diameters, R 5 D. Structurally, machine tools

contain a case or bed on which support rollers and punches are attached (bending templates). The movement of the punch relative to the support rollers is provided with a hydraulic cylinder (see. Fig. 42) or a screw (see. Fig. 44) working on compression.

A disadvantage of the known designs of benders are: 1. limited technical capabilities of benders in terms of bending radius, which does not provide bending of pipes with R 10 D;

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IPC F16L 43/00 V21C 37/28 B21D 9/07, 22/06

2. the hydraulic cylinder or screw stem works in compression when bending pipes, which limits the technical capabilities of pipe benders in terms of the stroke of the punch or the radius of bending of pipes R;

3.Large metal consumption, high design complexity, mechanization of the movement of the punch is required.

The technical task of the invention is the creation of a device for bending pipes on two supports, providing bending of pipes with a bending radius R of more than five pipe diameters D with minimal manufacturing and operating costs.

The technical problem is solved due to the fact that in the device for bending pipes on two supports containing support rollers, rounded on the bed, and a bending punch that moves relative to the support rollers by means of a screw, a bench plate is used as the device bed, in the grooves of which are mounted and fixed support rollers and stand, in the middle of the support rollers, with a screw connected by a fork to a bending punch bending the pipe when the screw is in tension; the bending punch is equipped with guides at the bottom - skis, which reduce friction when moving the punch on the plate, the segment edge of the punch provides visual control of the parallel movement of the punch when bending the pipe relative to the support rollers and grooves of the bench plate, and the side faces of the bench plate of the device are used as a template for control angle of bending of pipes and 90 °.

The proposed device is schematically represented in FIG. 1-4.

In FIG. 1 shows a device for bending pipes - top view, the position of the punch before bending the pipe and after bending the pipe;

in FIG. 3 - section BB in FIG. 1, the connection of the screw with the plate and the bending nounson;

in FIG. 4 is a view B in FIG. 3, view of the guides - ski nuanson.

The device contains a bench plate 1, in the grooves of which the support rollers 2 and the stand 3 are fixed with a screw 4 connected by a fork 5 to the bending punch 6. The bending punch is supplied with skids 7 in the lower part and has a segment rib 8, which provides visual control of parallel movement the punch relative to the support rollers and grooves 9 of the stand plate 1.

The device is assembled to work as follows.

Having developed and manufactured the units and parts of the device in metal, depending on the dimensions of the bent pipe D and R (Fig. 1), choose the dimensions of stand plate 1, PS 1-00101 (5000 X 2500 X 300 mm) or PS2-00-101 (3000 x 1500 x 300 mm) manufactured by Siblitmash. In the mounting grooves of the plate 1, support rollers 2 are installed at a distance L between each other and a stand 3 with a screw 4 at a distance of 0.5 L from one of the rollers (Fig. 1). The rollers 2 are mounted on the axis 10 and fixed on the plate 1 by means of the clamping plate 11, the stop 12 and the fixing bolt 13c with a washer and nut (Fig. 2). The screw 4 is connected to the plug 5 with a quick-release washer 14, the plug 5 with the bending punch 6 is a removable pin 15, and the rotation of the screw 4 and the movement of the punch 6 are provided with a screw drive, for example, a handle 16 (Fig. 3). The bending punch 6 rests on the plate 1 guides - ski 7 (Fig. 4).

The device operates as follows.

Set the bending punch 6 relative to the support rollers 2 in position I so that a straight pipe 17 can be inserted into the grooves of the support rollers 2. By rotating the screw 4, for example with handle 16, move the punch relative to the support rollers by the amount of stroke of the punch /, visually monitoring

parallel movement of the segment rib 8 of the punch relative to the support rollers 2 and the grooves 9 of the bench plate 1. The movement of the punch is carried out from position I to position II to obtain a curved pipe 18. By turning the screw in the opposite direction, the curved pipe 18 is released from the support rollers 2, and after removal quick-detachable washers 14 and removable pin 15 remove the curved pipe from the punch 6 and plug 5 (Fig. 1).

To make a new bent pipe, the plug 5 is connected to the screw 4 with a quick-release washer 14 and to the punch 6 with a removable pin 15 and the punch is moved to position I (Fig. 1).

An example of a specific implementation.

In the conditions of LLC Scientific-Pronzvodstvennaya Enterprise Khimneftearmatura, an order was fulfilled for the manufacture of bent pipes with dimensions 90 ° - 57 x 3 1500 - 1060 - 2360 mm and 90 ° - 38 X 3 - 1550 - 750 - 750 mm (a ° - D x S - R - / i - / a) from steel 20 from straight pipes 5775 mm and 4000 mm long, respectively.

When studying the bend pipe 90 ° -57 x 3-15 00-1060 2360 mm for manufacturability, it was found that for its bending on two supports it is required:

- distance between the support rollers L 2400 mm;

bending punch stroke / 630 mm;

- a screw with trapezoidal thread d 40 x 6 with an internal thread diameter of d 33 mm, for the screw operating condition in tension;

- a screw with an internal thread diameter di 252 mm (/: K 630: 2.5 252 mm, where K 2.5 is the coefficient of longitudinal stability of the screw), for the screw operating condition for compression (Fig. 1).

There was no press equipment with table dimensions for L 2400 mm in the Enterprise, but there was a PS 1-00-101 plate with dimensions of 5000 x 2500 x 300 mm. To drive a screw with di - 252 mm, mechanization of the screw drive is required.

A device for bending pipes 90 ° - 57 X 3 - 1500 x 1060 - 2360 mm with bending radius R 26.3 D and pipes 90 ° - 38 X 3 - 1550 - 500 - 500 mm was developed and manufactured in metal at the Khimneftearmatura Enterprise with a bending radius R 40.8 D with a manual drive of the screw operating in tension at d 40 x 6, and shown in FIG. 1-4 and in the photographs, Fig. 1 and 2.

The pipes bent according to the descriptions of the assembly and operation of the device. The quality of bent pipes was evaluated by the ovality of the cross section of the pipe in a curved section in comparison with the ovality of the pipe sections in straight sections and by the bending angle a of 90 °. The ovality of the pipe section in the curved section did not exceed 1.2%, and in straight sections did not exceed 1%. Deviations of the outer diameter were measured with a caliper. As a template for controlling the bending angle of 90 °, we used the sides of the bench plate 1 of the device - PS1-00-101, on which a straight section with / 1060 mm was set along the end of the plate width 2500 mm, and the angle deviation was measured at the end of the long section of pipe with / 2360 relative to the end of the plate length of 5000 mm. Deviations of bent pipes did not exceed ± 3 mm.

The positive effect of the proposed device:

1. Low-cost and easy to implement, it is only necessary to manufacture a working tool (bending punch and support rollers) and a tensile screw with a support and a fork.

2. Expands the technical capabilities of bending pipes with SK 5VdoK 40.8 D or more at minimum cost. 3. Provides high quality bent pipes and their control on the bench plate of the device used as a template for controlling the bending angle a 90 °.

Claims (3)

1. A device for bending pipes on two supports, containing support rollers mounted on a bed, and a bending punch moving relative to the support rollers by means of a screw, characterized in that a bench plate is used as the device bed, in the grooves of which support rollers are mounted and fixed and a stand in the middle of the support rollers with a screw connected by a fork to a bending punch bending the pipe when the screw is in tension. 2. The device according to claim 1, characterized in that the bending punch is provided in the lower part with guides - skis, which reduce friction when moving the punch on the plate, and the segment rib of the punch provides visual control of the parallel movement of the punch when bending the pipe relative to the support rollers and bench grooves slabs. 3. The device according to claims 1 and 2, characterized in that the side faces of the bench plate of the device are used as a template for controlling the angle of bending of the pipes α = 90 °.