A method and device for internal spinning corrugation of stable metal pipe fittings

Abstract

The present invention discloses a device for spinning corrugations inside a stable metal pipe fitting, comprising a driving device, a sliding seat and a guide rail that are slidably connected to each other, the sliding seat being rotatably mounted with a spinner through a bearing, the spinner comprising a first outer sleeve, a second outer sleeve, a retracting part and a telescopic element, the first outer sleeve and the second outer sleeve being connected by bolts, the retracting part being mounted at one end of the second outer sleeve, and the retracting part comprising a guide slider and a frustum seat, the present invention utilizes a first motor to drive the guide slider to rotate, thereby applying an outward expansion force to the inner wall of the metal pipe fitting, and at the same time, under the action of rotation, corrugations larger than the original diameter of the metal pipe fitting are formed, and the method does not require prior heating treatment of the metal pipe fitting, and while meeting production requirements, energy loss is greatly reduced, and corrugations of different diameters can be formed at different positions of the metal pipe fitting as required, and the device has a wide range of uses and strong practicality.

Description

Technical Field

[0001] The invention discloses a method and equipment for internal spinning corrugations of a stable metal pipe fitting, belonging to the technical field of metal fitting processing equipment. Background Art

[0002] Metal corrugated expansion joints are widely used in mechanical equipment and pipelines in modern industry. They can compensate for the displacement changes caused by temperature and load to pipes or tubular parts through their own elastic expansion and contraction, and can absorb mechanical vibrations. Therefore, metal corrugated expansion joints can effectively reduce the stress of pipes or tubular parts, thereby increasing their service life. Among them, metal bellows are the core components of metal bellows expansion joints. Metal bellows are thin-walled tubular parts with transverse corrugations. They have both elastic characteristics and sealing functions. Their geometric characteristics enable them to withstand large deformations under complex external forces. Now, metal bellows have been widely used in various industries and are important components in industrial equipment and pipelines. The rapid development of industry has put forward new requirements for the material properties of metal bellows.

[0003] The patent with announcement number CN105964749B discloses a manufacturing device for a metal bellows, which consists of an upper die base, a first seal, a mold, a heating wire, a lower die base, a metal tube, and a second seal. The mold is arranged between the upper die base and the lower die base, and the lower die base and the mold are connected by bolts. The metal tube is arranged in the mold and the second seal and the first seal are respectively installed at the upper and lower ends of the metal tube. The upper end of the second seal extends above the upper surface of the mold and is connected to the upper die base by bolts.

[0004] The above patent uses a heating wire to heat the part of the difficult-to-process metal material that needs to be deformed, so that the part of the metal material softens and improves plasticity. Then fill the metal tube with inert gas to increase the air pressure in the sealed metal tube, and use the air pressure to soften the metal sticker and mold. This method adopts the idea of ​​layer-by-layer heating, heating the bellows part circle by circle, and feeding the material to form it. After the bellows is formed, the mold is opened, the bellows is taken out, and a bellows made of a difficult-to-form metal material can be obtained. Although the production requirements of the bellows can be met, since the metal tube needs to be heated before forming, it belongs to a hot forming process, which has a large energy loss, and needs to be cooled after forming, which has a certain impact on the processing of the next process. At the same time, the diameter of the bellows is controlled by the mold, which means that a set of corresponding molds need to be made to form different types of bellows, which greatly increases the production cost and prolongs the production cycle. Summary of the invention

[0005] The purpose of the present invention is to solve the problems in the prior art and to provide a method and equipment for internal spinning corrugations of a stable metal pipe.

[0006] The present invention achieves the above-mentioned purpose through the following technical solutions, a method for internal spinning corrugation of a stable metal pipe, comprising the following steps:

[0007] S1: Clamp one end of the metal pipe on the three-jaw chuck, and the unclamped part of the metal pipe should not exceed 1 / 2 of its total length;

[0008] S2: The cylinder drives the frustum seat to move horizontally and causes the guide slider to approach the center of the frustum seat until the outer contour diameter formed by the convex edge is smaller than the diameter of the second outer sleeve;

[0009] S3: The second motor is used to drive the screw rod to rotate so that the frustum seat extends into the metal pipe and reaches the specified corrugation processing position, and then the cylinder slowly drives the frustum seat to move horizontally in the opposite direction to force the guide slider to move away from the center of the frustum seat, and at the same time, the first motor drives the first outer sleeve to rotate until the first corrugation of the metal pipe is formed;

[0010] S4: the first motor stops working, and after repeating step S2, the second motor drives the cone seat and the guide slider to move to the processing position of the second corrugation, and then repeats step S3 to form the second corrugation;

[0011] S5: the first motor stops working, and after repeating step S2, the second motor drives the cone seat to reset to the initial state, and stops the machine, and the metal pipe fitting on the three-jaw chuck is removed.

[0012] Preferably, the ratio of the maximum outer contour diameter of the corrugations formed on the metal pipe to the original diameter is less than 1.4:1.

[0013] A device for spinning corrugations in a stable metal pipe, comprising a driving device, a sliding seat and a guide rail that are slidably connected to each other, the sliding seat being rotatably mounted with a spinner through a bearing, the spinner comprising a first outer sleeve, a second outer sleeve, a retractable part and a telescopic element, the first outer sleeve and the second outer sleeve being connected by bolts, the retractable part being mounted at one end of the second outer sleeve, and the retractable part comprising a guide slider and a frustum seat, at least two guide sliders being symmetrically arranged around the frustum seat, and a convex edge being arranged on the outer contour edge of the guide slider, the first outer sleeve having a first slide groove for the guide slider to slide toward the center line direction of the frustum seat, the frustum seat being connected to the telescopic element by bolts, and a second slide groove for the guide slider to slide being arranged on the frustum seat, the sliding direction of the guide slider along the second slide groove being not parallel to the center line of the frustum seat, the telescopic element being mounted on the first outer sleeve, and the two being able to rotate synchronously, a first motor being arranged on the sliding seat, a pulley being arranged on the output shaft of the first motor and the first outer sleeve, the two pulleys being driven by a belt, and one end of the driving device being transmission-connected to the sliding seat.

[0014] Preferably, the guide sliding block is fixedly mounted with a positioning pin, and the frustum seat is provided with a third sliding groove for limiting the sliding distance of the positioning pin.

[0015] Preferably, three guide sliding blocks are provided and are distributed at 120° with the center of the frustum seat, and a positioning platform for limiting the guide sliding block is provided on the second outer sleeve.

[0016] Preferably, the telescopic element includes a connecting rod and a cylinder, the connecting rod is a stepped shaft structure and has a positioning surface that cooperates with the first outer sleeve, the frustum seat is provided with a boss that can be embedded in the connecting rod, and the two ends of the connecting rod are respectively connected to the frustum seat and the cylinder.

[0017] Preferably, the outer wall of the second outer sleeve has a frustum surface of at least 3-5°.

[0018] Preferably, the driving device comprises a second motor and a screw rod, one end of the screw rod is threadedly connected to the sliding seat, and the other end of the screw rod is fixed to the output shaft of the second motor.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The present invention adopts a cold working method to form corrugations on metal pipes, and uses a cylinder to drive the frustum seat to slide, so as to force the guide slider to slide from its center to the outside, thereby expanding the outer contour size of the outermost side of the guide slider, and the first motor drives the guide slider to rotate, thereby exerting an outward expansion force on the inner wall of the metal pipe, and at the same time, under the action of rotation, corrugations larger than the original diameter of the metal pipe are formed. This method does not require the metal pipe to be heated in advance, and greatly reduces energy loss while meeting production needs, and has strong practicality.

[0021] 2. There are three guide sliders, which slide outward at the same time under the action of the cylinder, and can apply forces in different directions to the inner walls of different positions of the same circumference of the metal pipe at the same time, so as to ensure force balance, and there will be no situation where a single position is subjected to force and causes the metal pipe to bend. The second motor can drive the guide slider to move horizontally, so that corrugations can be formed at different positions of the metal pipe as needed, and the diameter of the corrugation is determined by the cooperation between the guide slider and the frustum seat, thereby greatly improving the use range of the equipment, without the need to make corresponding molds, and significantly reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of the corrugation of the metal pipe;

[0023] Figure 2 It is a structural schematic diagram of a device for internally spinning corrugations of a stable metal pipe according to the present invention;

[0024] Figure 3 An exploded view of the spinning machine of the present invention;

[0025] Figure 4 is a cross-sectional view of the spinning device of the present invention;

[0026] Figure 5 It is a structural schematic diagram of the second outer sleeve in the present invention;

[0027] Figure 6 It is a structural schematic diagram of the guide slider and the frustum seat in the present invention;

[0028] Figure 7 It is a structural schematic diagram of the frustum seat in the present invention;

[0029] Figure 8 It is a schematic structural diagram of the guide slider in the present invention.

[0030] Figure numerals: 1. corrugation; 2. spinner; 3. pulley; 4. bearing; 5. telescopic element; 6. second motor; 7. first motor; 8. sliding seat; 9. guide rail; 10. screw rod; 11. guide slider; 12. frustum seat; 13. first outer sleeve; 14. cylinder; 15. connecting rod; 16. positioning surface; 17. second outer sleeve; 18. positioning pin; 19. second slide groove; 20. first slide groove; 21. positioning platform; 22. flange; 23. boss; 24. third slide groove. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] like Figure 1-Figure 8 As shown, a method for internal spinning corrugation of a stable metal pipe fitting comprises the following steps:

[0033] S1: Clamp one end of the metal pipe on the three-jaw chuck, and the unclamped part of the metal pipe should not exceed 1 / 2 of its total length;

[0034] S2: The cylinder 14 drives the frustum seat 12 to move horizontally and causes the guide slider 11 to approach the center of the frustum seat 12 until the outer contour diameter formed by the convex edge 22 is smaller than the diameter of the second outer sleeve 17;

[0035] S3: The second motor 6 is used to drive the screw rod 10 to rotate so that the frustum seat 12 extends into the metal pipe and reaches the designated corrugation 1 processing position, and then the cylinder 14 slowly drives the frustum seat 12 to move horizontally in the opposite direction to force the guide slider 11 to move away from the center of the frustum seat 12, and at the same time, the first motor 7 drives the first outer sleeve 13 to rotate until the first corrugation 1 of the metal pipe is formed;

[0036] S4: the first motor 7 stops working, and after repeating step S2, the second motor 6 drives the frustum seat 12 and the guide slide block 11 to move to the processing position of the second corrugation 1, and then repeats step S3 to form the second corrugation 1;

[0037] S5: the first motor 7 stops working, and after repeating step S2, the second motor 6 drives the frustum seat 12 to reset to the initial state, and stops the machine, and the metal pipe fitting on the three-jaw chuck is removed.

[0038] A device for spinning corrugations in stable metal pipes, comprising a driving device, a sliding seat 8 and a guide rail 9, wherein the sliding seat 8 is slidably connected to the guide rail 9, the driving device is mainly composed of a second motor 6 and a screw 10, one end of the screw 10 is threadedly connected to the sliding seat 8, and the other end is fixedly connected to the output shaft of the second motor 6. When the second motor 6 drives the screw 10 to rotate, the sliding seat 8 will slide horizontally along the guide rail 9, and the sliding seat 8 is rotatably installed with a spinner 2 through a bearing 4. The spinner 2 can extend into the metal pipe under the action of the second motor 6, and then spin its inner wall to form a corrugation 1.

[0039] The main structure of the spinner 2 includes a first outer sleeve 13, a second outer sleeve 17, a retractable part and a telescopic element 5, wherein the first outer sleeve 13 and the second outer sleeve 17 are fastened by bolts, and the retractable part is located on the inner side of the second outer sleeve 17, and the retractable part is composed of a guide slider 11 and a frustum seat 12, and the guide slider 11 is provided with three, and the frustum seat 12 is provided with a second slide groove 19 that cooperates with the guide slider 11, and the cross-section of the second slide groove 19 is T-shaped and passes through the frustum seat 12, and the guide slider 11 is slid into the second slide groove 19 from the end with a larger diameter of the frustum seat 12, and at the same time, a first slide groove 20 that cooperates with the guide slider 11 is provided on the second outer sleeve 17, and a positioning platform 21 is provided on the inner side of the second outer sleeve 17, and the positioning platform 21 can limit the guide slider 11 to move horizontally synchronously with the frustum seat 12, and when the frustum seat 12 moves horizontally along its center line direction, the matching surface of the frustum seat 12 and the guide slider 11 will force the guide slider 11 moves toward or away from the center of the frustum seat 12 along the direction of the first slide groove 20, thereby changing the size of the maximum outer contour diameter formed by the three guide sliders 11. In order to improve the forming quality of the corrugation 1, a convex edge 22 is provided on the outer contour edge of the guide slider 11. The cross-section of the convex edge 22 is a semicircular structure, and the central angle of the convex edge 22 is greater than 30°. At the same time, the three guide sliders 11 are installed on the frustum seat 12 at 120° to each other, so that when the guide slider 11 rotates, an outward expansion force can be applied to the inner wall of the three regions of the metal pipe at the same time, thereby reducing the bending of the metal pipe caused by unbalanced force and reducing the number of defective products. A positioning pin 18 is installed on the guide slider 11, and a third slide groove 24 is provided on the frustum seat 12. The third slide groove 24 can control the sliding distance of the positioning pin 18, thereby avoiding the guide slider 11 and the frustum seat 12 from sliding too far from each other and separating.

[0040] Secondly, the telescopic element 5 is composed of a cylinder 14 and a connecting rod 15. The connecting rod 15 is connected between the frustum seat 12 and the cylinder 14 by bolts, and the connecting rod 15 is a stepped shaft structure. A boss for limiting the sliding stroke of the connecting rod 15 is provided in the first outer sleeve 13, and a positioning surface 16 is also provided on the connecting rod 15, which cooperates with the first outer sleeve 13 to limit the rotation of the two. A boss 23 that can be embedded in the connecting rod 15 is provided on the frustum seat 12, so that it is convenient to assemble the frustum seat 12. The cylinder 14 is installed in the first outer sleeve 1 3, and can rotate synchronously with the first outer sleeve 13. The piston telescopic action of the cylinder 14 can drive the cone seat 12 to move linearly, and the outer wall of the second outer sleeve 17 has a cone surface of 3-5°, which can be smoothly inserted into the metal pipe to achieve automatic centering. A pulley 3 is installed on the first outer sleeve 13, and a first motor 7 is arranged on the sliding seat 8. A pulley 3 is also installed on the output shaft of the first motor 7. The two pulleys 3 are driven by belts, preferably toothed belts, which can effectively avoid slipping during transmission. The equipment and processing method of the present invention can quickly form a corrugation 1 of corresponding size at a specified position of a metal pipe. The cold forming method can not only reduce energy consumption, but also there is no mutual restriction in processing, reduce the mutual dependence between the previous and next processes, and also save the overall production and processing time of the metal pipe. The size of the corrugation 1 can also be adjusted at any time according to needs, which improves the diversity of production. There is no uneven force in the product production process, and its quality can be effectively guaranteed.

[0041] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0042] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A device for spinning corrugations inside a stable metal pipe, comprising a driving device, a sliding seat (8) and a guide rail (9) slidably connected to each other, characterized in that: The sliding seat (8) is rotatably mounted with a spinner (2) via a bearing (4), the spinner (2) comprising a first outer sleeve (13), a second outer sleeve (17), a retractable component and a telescopic element (5), the first outer sleeve (13) and the second outer sleeve (17) being connected via bolts, the retractable component being mounted on one end of the second outer sleeve (17), and the retractable component comprising a guide slider (11) and a frustum seat (12), the guide slider (11) being symmetrically arranged with the frustum seat (12) as the center, and the guide slider (11) 1) is provided with a convex edge (22) on the outer contour edge, the first outer sleeve (13) has a first slide groove (20) for the guide slider (11) to slide toward the center line direction of the frustum seat (12), the frustum seat (12) is connected to the telescopic element (5) by bolts, and the frustum seat (12) is provided with a second slide groove (19) for the guide slider (11) to slide, the guide slider (11) is not parallel to the center line of the frustum seat (12) along the sliding direction of the second slide groove (19), and the telescopic element (5) is installed on the first outer sleeve (13) ), and the two can rotate synchronously, the sliding seat (8) is provided with a first motor (7), the output shaft of the first motor (7) and the first outer sleeve (13) are both provided with pulleys (3), the two pulleys (3) are driven by belts, one end of the driving device is connected to the sliding seat (8), the guide slider (11) is fixedly mounted with a positioning pin (18), the frustum seat (12) is provided with a third slide groove (24) for limiting the sliding distance of the positioning pin (18), and the telescopic element (5) includes a connecting rod (15) and a cylinder (14), the connecting rod (15) is a stepped shaft structure and has a positioning surface (16) that cooperates with the first outer sleeve (13), the frustum seat (12) is provided with a convex head (23) that can be embedded in the connecting rod (15), and the two ends of the connecting rod (15) are respectively connected to the frustum seat (12) and the cylinder (14); the driving device includes a second motor (6) and a screw rod (10), one end of the screw rod (10) is threadedly connected to the sliding seat (8), and the other end is fixed to the output shaft of the second motor (6).

2. The device for internal spinning corrugation of a stable metal pipe according to claim 1, characterized in that: The guide sliding blocks (11) are provided in three numbers and are distributed at 120° with the center of the frustum seat (12). The second outer sleeve (17) is provided with a positioning platform (21) for limiting the position of the guide sliding blocks (11).

3. The device for internal spinning corrugation of a stable metal pipe according to claim 1, characterized in that: The outer wall of the second outer sleeve (17) has a frustum surface with an angle of at least 3-5°.

4. A method for internal spinning corrugation of a stable metal pipe, using the device according to any one of claims 1 to 3, characterized in that: The following steps are involved: S1: Clamp one end of the metal pipe on the three-jaw chuck, and the unclamped part of the metal pipe should not exceed 1 / 2 of its total length; S2: The cylinder (14) drives the frustum seat (12) to move horizontally and causes the guide slider (11) to approach the center of the frustum seat (12) until the outer contour diameter formed by the convex edge (22) is smaller than the diameter of the second outer sleeve (17); S3: using the second motor (6) to drive the screw rod (10) to rotate so that the frustum seat (12) extends into the metal pipe and reaches the designated corrugation (1) processing position, and then the cylinder (14) slowly drives the frustum seat (12) to move horizontally in the opposite direction to force the guide slider (11) to move away from the center of the frustum seat (12), while the first motor (7) drives the first outer sleeve (13) to rotate until the first corrugation (1) of the metal pipe is formed; S4: the first motor (7) stops working, and after repeating step S2, the second motor (6) drives the cone seat (12) and the guide slide block (11) to move to the processing position of the second corrugation (1), and then repeating step S3 to form the second corrugation (1); S5: the first motor (7) stops working, and after repeating step S2, the second motor (6) drives the cone seat (12) to reset to the initial state, and stops the machine, and the metal pipe fitting on the three-jaw chuck is removed.

5. The method according to claim 4, characterized in that The ratio of the maximum outer contour diameter of the corrugations (1) formed by the metal pipe to the original diameter is less than 1.4:1.

Images