CN114643305A - A method and equipment for inner spinning corrugation of stable metal pipe fittings - Google Patents

Abstract

The invention discloses a stable type metal pipe fitting inner spinning corrugation device, which comprises a driving device, a sliding seat and a guide rail, wherein the sliding seat and the guide rail are mutually connected in a sliding way, a spinning device is rotatably arranged on the sliding seat through a bearing and comprises a first outer sleeve, a second outer sleeve, an inner contraction part and a telescopic element, the first outer sleeve and the second outer sleeve are connected through a bolt, the inner contraction part is arranged at one end of the second outer sleeve and comprises a guide slide block and a conical seat, the guide slide block is driven by a first motor to rotate, so that the inner wall of the metal pipe fitting is exerted with an outward expansion acting force, corrugations larger than the original diameter of the metal pipe fitting are formed under the action of rotation, the method does not need to heat the metal pipe fitting in advance, the energy consumption is greatly reduced under the condition of meeting the production requirement, and the corrugations with different diameters can be formed at different positions of the metal pipe fitting according to the requirement, the equipment has wide application range and strong practicability.

Description

A method and equipment for inner spinning corrugation of stable metal pipe fittings

technical field

The invention discloses a method and equipment for inner spinning corrugation of a stable metal pipe fitting, belonging to the technical field of metal fittings processing equipment.

Background technique

Metal wave expansion joint is a component widely used in modern industry machinery equipment and transportation pipelines. It can compensate for the displacement changes caused by temperature and load to pipelines or tubular parts through its own elastic expansion and contraction, and can absorb mechanical vibrations at the same time. . Therefore, metal corrugated expansion joints can effectively reduce the stress of pipes or tubular parts, thereby increasing their service life. The metal bellows is the core component of the metal bellows expansion joint. The metal bellows is a thin-walled tubular part with transverse corrugations. It has both elastic characteristics and sealing functions. Its geometric characteristics enable it to withstand large deformations under the action of complex external forces. Now, metal corrugated pipes 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.

The patent with the publication number CN105964749B discloses a manufacturing device for a metal bellows, which consists of an upper die base, a first seal, a die, a heating wire, a lower die base, a metal tube, and a second seal. The die is arranged on the upper die. Between the die base and the lower die base, and the lower die base and the die are connected by bolts, the metal tube is arranged in the die, and the upper and lower ends of the metal tube are respectively installed with a second seal and a first seal, so The upper end of the second seal extends beyond the upper surface of the mold and is connected with the upper mold seat by bolts.

The above patent uses a heating wire to heat the part of the difficult-to-machine metal material that needs to be deformed, so that the part of the metal material is softened and the plasticity is improved. Then, the inert gas is filled into the metal tube to increase the air pressure in the sealed metal tube, and the softened metal sticker and the mold are made by the air pressure. This method adopts the idea of layer-by-layer heating, and heats the bellows part circle by circle, accompanied by material feeding to form it. After the corrugated pipe is formed, the mold is opened, and the corrugated pipe is taken out to obtain a corrugated pipe made of difficult-to-form metal materials. Although it can meet the production requirements of bellows, because the metal pipe needs to be heated before forming, it belongs to the thermoforming process, which consumes a large amount of energy and needs to be cooled after forming, which brings a certain amount of processing to 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 needs to be made to form different types of bellows, which greatly increases the production cost and prolongs the production cycle.

SUMMARY OF THE INVENTION

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

The present invention achieves the above object through the following technical solutions, a method for inner spinning corrugations of a stable metal pipe fitting, comprising the following steps:

S1: Clamp one end of the metal pipe on the three-jaw chuck, and the unclamped part of the metal pipe accounts for no more than 1/2 of its total length;

S2: The cylinder drives the conical pedestal seat to move horizontally and makes the guide block approach the center of the conical pedestal seat until the diameter of the outer contour formed by the convex edge is smaller than the diameter of the second outer sleeve;

S3: Use the second motor to drive the screw to rotate so that the conical pedestal extends into the metal pipe fitting and reaches the designated corrugated processing position, and then the cylinder slowly drives the conical pedestal to move horizontally in the opposite direction to force the guide block to move away from the center of the conical pedestal moving, while the first motor drives the first outer sleeve to rotate, until the first part of the metal pipe is corrugated;

S4: the first motor stops working, after repeating step S2, the second motor drives the cone pedestal and the guide block to move to the processing position of the second corrugation, and repeats step S3 to form the second corrugation;

S5: The first motor stops working, and after repeating step S2, the second motor drives the cone pedestal to return to the initial state, and then stops, and removes the metal pipe fitting on the three-jaw chuck.

Preferably, the ratio of the maximum outer contour diameter of the corrugated metal pipe fitting to the original diameter is less than 1.4:1.

A device for spinning corrugations in a stable metal pipe includes a driving device, a sliding seat and a guide rail that are slidably connected to each other, the sliding seat is rotatably mounted with a spinner through a bearing, and the spinner includes a first outer sleeve , a second outer sleeve, an inner shrinking part and a telescopic element, the first outer sleeve and the second outer sleeve are connected by bolts, the inner shrinking part is installed at one end of the second outer sleeve, and the inner shrinking part is It includes a guide block and a cone pedestal seat, at least two of the guide block are symmetrically arranged around the cone pedestal seat, and the outer contour edge of the guide block is provided with a convex edge, and the first outer sleeve has a supply guide block for the guide block. A first chute sliding toward the centerline of the cone pedestal seat, the cone pedestal seat is connected with the telescopic element by bolts, and a second chute for the sliding block is provided on the cone pedestal seat, and the guide block slides along the second sliding block. The sliding direction of the slot is not parallel to the center line of the cone pedestal seat, the telescopic element is installed on the first outer sleeve, and the two can rotate synchronously, the sliding seat is provided with a first motor, and the first motor Both the output shaft and the first outer sleeve are provided with pulleys, the two pulleys are driven by belts, and one end of the driving device is connected to the sliding seat in a drive.

Preferably, a positioning pin is fixedly installed on the guide block, and a third chute for limiting the sliding distance of the positioning pin is provided on the conical pedestal seat.

Preferably, there are three guide blocks arranged at 120° in the center of the conical pedestal seat, and a positioning platform for limiting the guide blocks is provided on the second outer sleeve.

Preferably, the telescopic element includes a connecting rod and a cylinder, the connecting rod is a stepped shaft structure, and has a positioning surface matched with the first outer sleeve, and the conical pedestal seat is provided with a convex head that can be embedded in the connecting rod , the two ends of the connecting rod are respectively connected with the cone pedestal seat and the cylinder.

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

Preferably, the driving device includes a second motor and a screw rod, one end of the screw rod is threadedly connected with the sliding seat, and the other end is fixed on the output shaft of the second motor.

Compared with the prior art, the beneficial effects of the present invention are:

1. The present invention adopts the method of cold working to form corrugations on the metal pipe fittings, and uses the cylinder to drive the conical pedestal to slide to force the guide block to slide from its center to the outside, thus expanding the outer contour size of the outermost guide block, and by the first The motor drives the guide block to rotate, thereby exerting an outwardly expanding force on the inner wall of the metal pipe fitting, and at the same time, under the action of rotation, a corrugation larger than the original diameter of the metal pipe fitting is formed. This method does not need to heat the metal pipe in advance. In the case of meeting the production demand, the energy consumption is greatly reduced, and the practicability is strong.

2. There are three guide sliders, which slide outward at the same time under the action of the cylinder, and can exert different directions of force on the inner wall of the metal pipe fittings at different positions on the same circumference at the same time, so that the force balance can be ensured, and there will be no single When the position is subjected to a force, the metal pipe is bent, and the second motor can drive the guide block to move horizontally, so that corrugations can be formed at different positions of the metal pipe according to the needs, and the diameter of the corrugation is based on the guide block and the cone. It is determined by the cooperation of the pedestal, which greatly improves the use range of the equipment, does not need to make corresponding molds, and significantly reduces the production cost.

Description of drawings

Fig. 1 is the structural schematic diagram of the corrugation of metal pipe fittings;

2 is a schematic structural diagram of a device for spinning corrugations in a stable metal pipe fitting according to the present invention;

3 is an exploded view of the spinner in the present invention;

Fig. 4 is the sectional view of the spinner in the present invention;

Fig. 5 is the structural representation of the second outer sleeve in the present invention;

6 is a schematic structural diagram of a guide block and a cone pedestal in the present invention;

Fig. 7 is the structural representation of cone pedestal in the present invention;

FIG. 8 is a schematic diagram of the structure of the guide slider in the present invention.

Reference signs: 1, corrugation; 2, spinner; 3, pulley; 4, bearing; 5, telescopic element; 6, second motor; 7, first motor; 8, sliding seat; 9, guide rail; 10, Lead screw; 11. Guide slider; 12. Cone seat; 13. First outer sleeve; 14. Cylinder; 15. Connecting rod; 16. Positioning surface; 17. Second outer sleeve; 18. Positioning pin; 19 , the second chute; 20, the first chute; 21, the positioning table; 22, the convex edge; 23, the convex head; 24, the third chute.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

As shown in Figures 1-8, a method for spinning corrugations in a stable metal pipe fitting includes the following steps:

S1: Clamp one end of the metal pipe on the three-jaw chuck, and the unclamped part of the metal pipe accounts for no more than 1/2 of its total length;

S2: Drive the cone pedestal 12 to move horizontally by the cylinder 14 and make the guide block 11 approach the center of the cone pedestal 12 until the diameter of the outer contour formed by the raised edge 22 is smaller than the diameter of the second outer sleeve 17;

S3: The second motor 6 is used to drive the screw 10 to rotate so that the conical pedestal 12 extends into the metal pipe fitting and reaches the designated corrugation 1 processing position, and then the cylinder 14 slowly drives the conical pedestal 12 to move horizontally in the opposite direction to force the guide block 11 moves away from the center of the cone pedestal 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 fitting is formed;

S4: The first motor 7 stops working. After repeating step S2, the second motor 6 drives the cone pedestal 12 and the guide block 11 to move to the processing position of the second corrugation 1, and repeats step S3 to form the second corrugation 1 ;

S5: The first motor 7 stops working. After repeating step S2, the second motor 6 drives the cone pedestal 12 to reset to the initial state, and then stops, and removes the metal pipe fitting on the three-jaw chuck.

A device for stabilizing the inner spinning corrugation of a metal pipe, including a driving device, a sliding seat 8 and a guide rail 9, wherein the sliding seat 8 is slidably connected with the guide rail 9, and the driving device is mainly composed of a second motor 6 and a lead screw 10. One end of 10 is threadedly connected with the sliding seat 8, and the other end is fixedly connected with the output shaft of the second motor 6. When the second motor 6 drives the lead screw 10 to rotate, the sliding seat 8 will slide horizontally along the guide rail 9, while the sliding seat 8 The spinner 2 is rotatably mounted on the bearing 4 , and the spinner 2 can extend into the metal pipe under the action of the second motor 6 , and then spin the inner wall thereof to form the corrugation 1 .

The main structure of the spinner 2 includes the first outer sleeve 13, the second outer sleeve 17, the inner shrinking part and the telescopic element 5, wherein the first outer sleeve 13 and the second outer sleeve 17 are fastened by bolts, and the The inner shrinking piece is located inside the second outer sleeve 17, and the inner shrinking piece is composed of a guide block 11 and a cone pedestal seat 12. There are three guide blocks 11. Slot 19, the cross section of the second chute 19 is T-shaped, and passes through the cone truncated seat 12, the guide block 11 is slid into the second chute 19 from the larger diameter end of the cone truncated seat 12, and at the same time in the second outer sleeve 17 There is a first chute 20 that cooperates with the guide block 11, and a positioning table 21 is provided on the inner side of the second outer sleeve 17. The positioning table 21 can limit the guide block 11 to follow the cone pedestal 12 to move synchronously and horizontally. When the pedestal 12 moves horizontally along the direction of its center line, the mating surface of the conical pedestal 12 and the guide block 11 will force the guide block 11 to approach or move away from the center of the conical pedestal 12 along the direction of the first chute 20, thereby changing the three The size of the maximum outer contour diameter formed by each guide block 11, in order to improve the molding quality of the corrugated 1, the outer contour edge of the guide block 11 is provided with a convex edge 22, the cross section of the convex edge 22 is a semicircular structure, and the convex edge 22 The central angle is greater than 30°, and the three guide blocks 11 are installed on the conical pedestal seat 12 in a manner of 120° to each other, so that when the guide block 11 rotates, it can simultaneously apply outward force to the inner walls of the three areas of the metal pipe fittings. The expansion force can reduce the bending of the metal pipe fittings caused by the unbalanced force, and reduce the number of defective products. The guide block 11 is provided with a positioning pin 18, and the cone pedestal 12 is provided with a third chute. 24. The third sliding groove 24 can control the sliding distance of the positioning pin 18, so as to avoid the situation that the sliding distance between the guide block 11 and the cone-shaped pedestal 12 is too large to cause separation.

Secondly, the telescopic element 5 is composed of a cylinder 14 and a connecting rod 15. The connecting rod 15 is connected between the cone base 12 and the cylinder 14 by bolts, and the connecting rod 15 is a stepped shaft structure. The connecting rod 15 is a boss for limiting the sliding stroke, and the connecting rod 15 is also provided with a positioning surface 16, which cooperates with the first outer sleeve 13 to limit the rotation of the two. The convex head 23 of the connecting rod 15 facilitates the assembly of the conical pedestal 12. The cylinder 14 is mounted on the first outer sleeve 13 and can rotate synchronously with the first outer sleeve 13, and can be driven by the telescopic action of the piston of the cylinder 14. The conical truncated seat 12 moves linearly, and the outer wall of the second outer sleeve 17 has a 3-5° conical truncated surface, which can be smoothly inserted into the metal pipe to realize automatic centering, and is installed on the first outer sleeve 13 There is a pulley 3, a first motor 7 is arranged on the sliding seat 8, and 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 slippage during transmission. Case. By using the equipment and processing method of the present invention, corrugations 1 of corresponding sizes can be quickly formed at the designated positions of the metal pipe fittings, and the cold forming method can not only reduce energy consumption, but also have no mutual limitation in processing, and reduce the mutual interaction between the front and rear processes. It also saves the overall production and processing time of metal pipe fittings. The size of 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 production process of the product, and its quality can be effectively guaranteed. .

It will be apparent to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, but that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments are to be regarded in all respects as illustrative and not restrictive, and the scope of the invention is to be defined by the appended claims rather than the foregoing description, which are therefore intended to fall within the scope of the claims. All changes within the meaning and scope of the equivalents of , are included in the present invention. Any reference signs in the claims shall not be construed as limiting the involved claim.

In addition, it should be understood that although this specification is described in terms of embodiments, not each embodiment only includes an independent technical solution, and this description in the specification is only for the sake of clarity, and those skilled in the art should take the specification as a whole , the technical solutions in each embodiment can also be appropriately combined to form other implementations that can be understood by those skilled in the art.

Claims (8)

1. A method for spinning corrugations in a stable metal pipe fitting is characterized by comprising the following steps:

s1: clamping one end of the metal pipe fitting on a three-jaw chuck, wherein the undamped part of the metal pipe fitting accounts for no more than 1/2 of the total length of the metal pipe fitting;

s2: the cylinder (14) drives the cone table seat (12) to move horizontally and enables the guide slide block (11) to approach to the center of the cone table seat (12) until the diameter of the outer contour formed by the convex edge (22) is smaller than that of the second outer sleeve (17);

s3: a second motor (6) is utilized to drive a screw rod (10) to rotate, so that a conical pedestal (12) extends into the metal pipe fitting and reaches a specified corrugation (1) processing position, then a cylinder (14) slowly drives the conical pedestal (12) to horizontally move in the opposite direction so as to force a guide slider (11) to move towards the center far away from the conical pedestal (12), and meanwhile, a first motor (7) drives a first outer sleeve (13) to rotate until a first corrugation (1) of the metal pipe fitting is formed;

s4: the first motor (7) stops working, after the step S2 is repeated, the second motor (6) drives the conical pedestal (12) and the guide slide block (11) to move to the processing position of the second corrugation (1), and the step S3 is repeated to form the second corrugation (1);

s5: and (4) stopping the first motor (7), repeating the step S2, driving the cone pedestal (12) to reset to the initial state by the second motor (6), stopping the machine, and taking down the metal pipe fitting on the three-jaw chuck.

2. A method of spinning corrugations in a stabilized metal tube according to claim 1, characterized in that the ratio of the maximum outer profile diameter of the corrugations (1) formed in the metal tube to the original diameter is less than 1.4: 1.

3. The utility model provides a corrugated equipment of spinning in stable form metal pipe fitting, includes drive arrangement, mutual sliding connection's sliding seat (8) and guide rail (9), its characterized in that, sliding seat (8) are installed through bearing (4) rotation and are revolved depressor (2), revolve depressor (2) including first outer sleeve (13), second outer sleeve (17), the piece that contracts and telescopic element (5), first outer sleeve (13) and second outer sleeve (17) pass through bolted connection, the piece that contracts is installed in the one end of second outer sleeve (17) to the piece that contracts includes guide slide block (11) and frustum seat (12), guide slide block (11) use frustum seat (12) as the center at least symmetry be provided with two to the outer profile edge of guide slide block (11) is provided with chimb (22), first outer sleeve (13) have supply guide slide block (11) towards the gliding first spout (20) of frustum seat (12) central line direction, awl pedestal (12) are connected with telescopic element (5) through the bolt to be provided with on awl pedestal (12) and supply to lead gliding second spout (19) of slider (11), lead slider (11) along the slip direction of second spout (19) and the central line nonparallel of awl pedestal (12), telescopic element (5) are installed on first outer sleeve (13), and both can synchronous rotation, be provided with first motor (7) on sliding seat (8), all be provided with belt pulley (3) on the output shaft of first motor (7) and first outer sleeve (13), two belt pulley (3) pass through belt drive, drive arrangement's one end and sliding seat (8) transmission are connected.

4. The apparatus for spinning corrugations in a stable metal pipe fitting according to claim 3, characterized in that the guide slider (11) is fixedly provided with a positioning pin (18), and the conical pedestal (12) is provided with a third sliding groove (24) for limiting the sliding distance of the positioning pin (18).

5. A stabilized metal pipe internal spinning corrugation device according to claim 4, wherein the number of the guide sliding blocks (11) is three and is distributed by 120 degrees from the center of the conical pedestal (12), and the second outer sleeve (17) is provided with a positioning table (21) for limiting the guide sliding blocks (11).

6. A device for spinning corrugations in a stable metal tube according to claim 3, characterized in that the telescopic element (5) comprises a connecting rod (15) and a cylinder (14), the connecting rod (15) is of a stepped shaft structure and has a positioning surface (16) which is matched with the first outer sleeve (13), the conical pedestal (12) is provided with a raised head (23) which can be embedded into the connecting rod (15), and two ends of the connecting rod (15) are respectively connected with the conical pedestal (12) and the cylinder (14).

7. A stabilized metal tube internally corrugated apparatus according to claim 3, wherein said second outer sleeve (17) has an outer wall with a tapered surface of at least 3-5 °.

8. A stable type metal pipe internal spinning corrugation device according to claim 3, wherein the driving device comprises a second motor (6) and a lead screw (10), one end of the lead screw (10) is in threaded connection with the sliding seat (8), and the other end of the lead screw is fixed on an output shaft of the second motor (6).

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