CN115958103A

CN115958103A - Equipment for axial upsetting forming of large-diameter metal corrugated pipe and machining method of equipment

Info

Publication number: CN115958103A
Application number: CN202211205655.3A
Authority: CN
Inventors: 宋苗玉; 胡德友; 杨廷; 孙磊
Original assignee: Tianjin Aerospace Changzheng Rocket Manufacturing Co ltd; Harbin Institute of Technology Weihai
Current assignee: Tianjin Aerospace Changzheng Rocket Manufacturing Co ltd; Harbin Institute of Technology Weihai
Priority date: 2022-09-30
Filing date: 2022-09-30
Publication date: 2023-04-14

Abstract

The invention relates to equipment and a processing method for axial upsetting forming of a large-diameter metal corrugated pipe, and belongs to the technical field of metal processing. The equipment for axial upsetting forming of the large-diameter metal corrugated pipe comprises a base and is characterized in that a fixed plate A and a fixed plate B are mounted on the base, a fixed die base plate and a movable die base plate are mounted between the fixed plate A and the fixed plate B, the fixed plate A, the fixed plate B, the fixed die base plate and the movable die base plate are provided with middle holes, the fixed plate B, the fixed die base plate and the movable die base plate are connected into a whole in series through a connecting beam column, the movable die base plate is slidably mounted on the connecting beam column, and the end part of a piston rod of a hydraulic cylinder fixedly mounted on the fixed plate A is connected with the movable die base plate; the servo-actuated frame is fixed on the movable mould base plate, the connecting end of the servo-actuated sealing component is fixed on the servo-actuated frame, and the sealing end of the servo-actuated sealing component is positioned in the middle hole of the movable mould base plate; and a forming die A is arranged on the fixed die base plate around the middle hole, and a forming die B is arranged on the movable die base plate around the middle hole.

Description

Equipment for axial upsetting forming of large-diameter metal corrugated pipe and machining method of equipment

Technical Field

The invention relates to equipment and a processing method for axial upsetting forming of a large-diameter metal corrugated pipe, and belongs to the technical field of metal processing.

Background

Metal bellows are widely used in industrial production as flexible connections, however, different application fields put different performance requirements on metal bellows. At present, due to the defects of the structural design and the manufacturing technology of the metal corrugated pipe, the corrugated pipe has various failure problems of stress concentration fracture, brittle fracture, corrosion fracture, low fatigue life, deformation extrusion damage and the like under different working conditions.

When the metal corrugated pipe is formed, particularly traditional hydraulic bulging, the bulging stage is not axially fed, so that the deformation of the center area of the wave crest is large, the wall thickness is seriously reduced, after the metal corrugated pipe is formed, the wall thickness from the wave trough to the wave crest is seriously and unevenly distributed, and the residual stress difference between the wave crest and the wave trough of the metal corrugated pipe is large, so that the stress concentration area is easy to generate early corrosion cracking in engineering application, and the service performance and the service life of the metal corrugated pipe are seriously influenced. In addition, when the hydraulic bulging expansion amount is large, the welding seam of the pipe is easy to crack. Therefore, reduction of the strain amount and the wall thickness reduction rate at the time of forming is significant for improvement of the manufacturing and service performance of the corrugated pipe.

Meanwhile, the existing processing equipment and processing method have the defects in the continuous forming of the corrugated pipe, and are not convenient for the continuous forming of large pipes, and the problem of uneven wall thickness of the pipe wall can be caused in the wave forming process.

Disclosure of Invention

In order to realize the single-wave continuous forming of the corrugated pipe, the application provides equipment for the axial upsetting forming of the large-diameter metal corrugated pipe and a method for processing the corrugated pipe by using the equipment.

The invention solves the technical problems through the following technical scheme:

the equipment for axial upsetting forming of the large-diameter metal corrugated pipe comprises a base and is characterized in that a fixed plate A and a fixed plate B are installed on the base, a fixed die base plate and a movable die base plate are installed between the fixed plate A and the fixed plate B, the fixed plate A, the fixed plate B, the fixed die base plate and the movable die base plate are provided with middle holes, the fixed plate B, the fixed plate A, the fixed die base plate and the movable die base plate are connected into a whole through a connecting beam column in series, the movable die base plate is installed on the connecting beam column in a sliding mode, and the end portion of a piston rod of a hydraulic cylinder fixedly installed on the fixed plate B is connected with the movable die base plate; the servo frame is fixed on the movable mould base plate, the connecting end of the servo sealing assembly is fixed on the servo frame, and the sealing end of the servo sealing assembly is positioned in the middle hole of the movable mould base plate; the movable sealing component is arranged on the base through the sliding block and the sliding rail; and a forming die A is arranged on the fixed die base plate around the middle hole, and a forming die B is arranged on the movable die base plate around the middle hole. The fixed die base plate can also be arranged on the fixed plate B through a hydraulic cylinder in the same way as the moving die base plate.

The technical scheme has the advantages that: in the equipment, the fixed plate A, the fixed plate B, the fixed die base plate and the movable die base plate are connected in series through the connecting beam column, and the holes in the fixed die base plate and the movable die base plate are ensured to be on the same axis, so that the movable sealing assembly and the follow-up sealing assembly can well control the installation positions; the movable sealing component is arranged on the rack in a sliding block and track mode, so that the moving stability can be ensured, and the movable sealing component can be driven by a motor or a hydraulic cylinder; the servo sealing component is connected with the movable die base plate into a whole through the servo frame, so that the sealing position is fixed, the pipe can be sealed at any time only by adjusting the position of the pipe, and then the pipe is pressurized and processed.

On the basis of the technical scheme, the application makes the following improvements and improvements on the technical scheme:

further, the forming die A is composed of at least two split assemblies A; the split assembly A comprises a split sliding plate A and a forming part A on the split sliding plate A, the forming part A is in a local ring shape, the split sliding plate A comprises a sliding tail plate with a guiding function and a crescent moon plate at the front end, the sliding tail plate is inserted into a sliding groove of the fixed seat block, the split cylinder is fixed on the fixed seat block, and a piston rod of the split cylinder A is connected with an ear plate on the split seat block; the inner wall of the forming part A and the joint side of the split sliding plate A are provided with necking slopes, the forming end face of the forming part A is provided with a forming half cavity A, and the necking slopes are provided with transition faces from the forming half cavity A to the forming half cavity A.

Furthermore, the splicing assembly A is spliced into a complete annular cavity, so that sealing forming can be finished when the mold is closed, and wave inlet and wave outlet during subsequent continuous wave production can be guaranteed when the mold is opened.

Further, the cross section of the molding half cavity a includes a transition arc, a sidewall arc, a shoulder arc, and a top arc.

Furthermore, the forming mold B comprises at least two split assemblies B, each split assembly B comprises a crescent ring B, a guide sliding plate B is arranged on the outer ring wall of each crescent ring B, a guide ring plate B is inserted into a slot of the corresponding fixing seat B, the split air cylinder B is fixed on the corresponding fixing seat B, the end part of a piston rod of the split air cylinder B is connected with an ear plate B on the crescent ring B, a forming part B is arranged on the inner ring of each crescent ring B, and a forming half cavity which is in mirror phase with the forming half cavity A is arranged on the end face of the split end face of the forming part B and the forming part A.

The technical characteristics have the beneficial effects in the application that: the forming die A and the forming die B are combined structures, and the forming die A and the forming die B are structurally characterized in that the dies are positioned to be opened and closed, the dies are opened and closed by utilizing the air cylinders, the determination of the clamping position of the positions on the pipe can be realized, the forming die A and the forming die B are respectively provided with a half forming cavity, so that the length of the pipe required by forming can be controlled in processing, the forming requirement of the pipe is ensured, meanwhile, the forming die B moves to the fixed die base plate along with the movable die base plate, axial material supplement is carried out on the pipe, forming waveforms can be effectively compensated, and the thickness of the forming waves is ensured.

Furthermore, the movable sealing assembly comprises a counterweight seat, the sliding block is installed at the bottom of the counterweight seat, a connecting rod A is installed at the top of the counterweight seat, a sealing head A is installed at the end part of the connecting rod A, the sealing head A is barrel-shaped, a raised sealing ring seat A is arranged on the outer side of the barrel edge of the sealing head A, a sealing groove is formed in the sealing ring seat A, an annular expansion air bag is installed at the bottom of the sealing groove, and a sealing ring A is sleeved on the outer side of the expansion air bag. Wherein, the tip stock of connecting rod A is removable for adapt to the initial blank of different length.

The technical characteristics have the beneficial effects in the application that: the inflation gasbag is an annular gasbag, through inflating the high pressure gas and exhaust to the inflation gasbag, the sealed A expansion of sealing washer in its outside of control is sealed or the shrink is relieved sealedly, just so can guarantee when processing the single ripples, the inside leakproofness of tubular product, the single ripples processing is accomplished, reserves sufficient space and lets tubular product impel forward, also reduces the friction between tubular product inner wall and the sealing washer A simultaneously, increases sealing washer A's life, reduce cost. Meanwhile, the formed pipe can be still fixed by filling low-pressure air into the expansion air bag, so that the formed pipe can be automatically moved, and the automatic feeding and discharging of the formed pipe are facilitated.

Further, the follow-up sealing assembly comprises a barrel-shaped sealing head B, and the sealing head B is fixedly installed on the follow-up fixing plate through a fixing connecting rod. The follow-up fixing plate is fixed on the follow-up frame. Wherein the fixed connecting rod can be replaced for adapting to forming pieces of different lengths, and an internal pressurizing pipe and an internal pressurizing joint penetrating through the sealing head B are arranged inside the connecting rod.

The technical characteristics have the beneficial effects in the application that: the sealing structure of the follow-up sealing head is also designed to be the same as that of the sealing head A, and the expansion or contraction of the sealing ring on the outer side is controlled by the expansion air bag.

The servo seal is adopted, the seal structure can float synchronously along with the pressure head, the seal ring does not have relative displacement sliding with the pipe wall of the formed workpiece, the seal is reliable, and the service life of the seal ring is long. The floating seal guarantees the material supplement amount in the forming process, further guarantees the shape precision, can avoid the problem that the traditional fixed inner seal can not accurately control the material supplement amount, and solves the thinning problem of large-deformation parts such as compensators.

Further, the device also comprises a pressure system and an electrical control system.

Hydraulic pressure and air pressure are provided for the system through a pressure system, and the system is electrically controlled to control the operation of equipment.

A processing method of a metal corrugated pipe is characterized by comprising the following steps:

step 1, feeding: placing the pipe on an arc material supporting part of a support frame on a rack, wherein the arc material supporting part of the support frame is provided with a roller, and pushing the pipe to penetrate through the middle holes of a fixed plate A and a fixed die base plate; moving the sealing assembly to move on the slide rail through the counterweight seat to drive the sealing head A at the end part of the connecting rod A to move and be inserted in the center of the pipe and penetrate into the forming die A; the forming mold A on the fixed mold base plate acts, a forming part A of the forming mold A is driven by the splicing cylinder to be matched, and a complete forming mold A is spliced; one end of the pipe is clamped and sealed by the complete forming die A and the sealing head A;

step 2, pre-mold assembly: the hydraulic cylinder pushes the movable mold base plate to move, the movable mold base plate moves together with the movable seal assembly, the moving is stopped when the distance between the movable mold base plate and the fixed mold base plate reaches a set distance, the forming mold B on the movable mold base plate acts, and the forming part B is spliced into a complete forming mold B under the driving of the splicing assembly B of the forming mold; the complete forming die B and a sealing head B of the follow-up sealing assembly clamp and seal the other end of the pipe;

and 3, forming under the combined action of axial supply and internal pressure of the die by adopting an axial upsetting forming technology:

after the die A and the die B as well as the corresponding movable sealing assembly and the corresponding follow-up sealing assembly move to set positions, a sealed cavity is formed by the tube blank and the sealing assembly, inert gas slightly larger than the yield pressure of the tube blank is filled into the tube blank, so that the material in a deformation area of the tube blank is yielded and generates certain deformation, the tube blank pushes the forming die B and the follow-up sealing assembly 13 on the movable die base plate and the movable die base plate to move together through a hydraulic cylinder under the supporting action of forming internal pressure, axial feeding is provided to enable the sealing part of the tube blank to generate bending deformation and gradually fit with a die cavity formed by the die A and the die B until all the dies are tightly closed, and the sealing part of the tube blank finishes final die fitting under the action of the bending pressure provided by the movable die and the forming internal pressure; by adopting the axial upsetting forming method, the wall thickness thinning rate of the corrugated pipe is reduced, so that the larger residual stress at the positions of wave crests and wave troughs caused by the serious thinning of the wall thickness is reduced, the service performance of the metal corrugated pipe is improved, and the fatigue life of the metal corrugated pipe is prolonged;

molding in a mode of pressurizing while axially supplying until die assembly is carried out, and controlling the pressure and the axial supply length inside the sealing section according to the material and the wall thickness of the pipe; specifically, the internal pressurization axial supply molding: by filling high-pressure gas into the sealed space, under pressure support, the hydraulic right cylinder on the fixed plate A pushes the fixed die base plate) to move towards the movable die base plate until the die A and the die B are closed, and the pipe forms a waveform of the closed die of the die A and the die B under the actions of internal pressure support and axial supply. By adopting the axial upsetting forming method, the wall thickness thinning rate of the corrugated pipe can be reduced, so that the residual stress at the positions of wave crests and wave troughs caused by the serious thinning of the wall thickness is reduced, the service performance of the metal corrugated pipe is improved, and the fatigue life of the metal corrugated pipe is prolonged.

Drawings

FIG. 1 is a schematic perspective view of an apparatus for forming large-diameter metal corrugated pipe by axial upsetting;

FIG. 2 is a front view of FIG. 1;

FIG. 3 is a schematic view of the structure of the pipe installed on the apparatus;

FIG. 4 is a schematic view showing the installation relationship of a fixed plate A, a fixed plate B, a fixed mold base plate and a movable mold base plate;

FIG. 5 is a schematic perspective view of a mold A;

FIG. 6 is a schematic view of the construction of the split assembly A;

FIG. 7 is an enlarged view of FIG. 6 at A;

FIG. 8 is a schematic perspective view of a forming mold B;

FIG. 9 is a perspective view of the split assembly B;

FIG. 10 is an enlarged view of FIG. 9 at B;

FIG. 11 is a perspective view of the moving seal assembly;

FIG. 12 is a cross-sectional view of the seal head A link and seal head;

FIG. 13 is a sectional view showing the installation structure of the inflatable bladder and the seal ring A of the seal head A;

FIG. 14 is a perspective view of the follower seal assembly;

fig. 15 is a schematic view of a pressure system and electrical control system and the apparatus mounting structure of the present application.

Description of reference numerals: a base-1, a fixed support frame-2, a follow-up frame-3, a movable sealing component-4, a fixed plate A-5, a fixed mold base plate-6, a splicing component A-7, a fixed plate B-8, a movable mold base plate-9, a splicing component B-10, a connecting beam column-11, a support frame-12, a follow-up sealing component-13, a support cylinder-14, a hydraulic cylinder-15, a pipe-100, a pressure system-101 and an electrical control system-102,

4.1 of counterweight seat, 4.2 of connecting rod A, 4.21 of connecting rod A of sealing head A, 4.3 of sealing head A, 4.31 of sealing ring seat A, 4.32 of expansion airbag, 4.33 of sealing ring A, 4.34 of sealing ring,

a split sliding plate A-7.1, a fixed seat block-7.2, a split cylinder A-7.3, an ear plate-7.4, a forming part A-7.5, a forming half cavity A-7.51, a transition arc-7.511, a side wall arc-7.512, a shoulder arc-7.513, a top arc-7.514, a necking inclined plane-7.53, a crescent-7.11 and a sliding tail plate-7.12,

crescent ring B-10.1, fixed seat B-10.2, split cylinder B-10.3, ear plate B-10.4, forming part B-10.5,

a sealing head B-15.1, a fixed connecting rod-15.2 and a follow-up fixed plate-15.3.

Detailed Description

The following examples are only for illustrating the technical solutions described in the claims with reference to the drawings, and do not limit the scope of the claims.

With reference to the attached drawings 1-4, the equipment for axial upsetting forming of the large-diameter metal corrugated pipe comprises a base 1, wherein a fixed plate A5 and a fixed plate B8 are installed on the base 1, a fixed die base plate 6 and a movable die base plate 9 are installed between the fixed plate A5 and the fixed plate B8, the fixed plate A5, the fixed plate B8, the fixed die base plate 6 and the movable die base plate 9 are all provided with middle holes, the fixed plate B8, the fixed plate A5, the fixed die base plate 6 and the movable die base plate 9 are connected into a whole in series through a connecting beam column 11, the movable die base plate 9 is installed on the connecting beam column 11 in a sliding mode, and the end part of a piston rod of a hydraulic cylinder 15 fixedly installed on the fixed plate B8 is connected with the movable die base plate 9; the servo frame 3 is fixed on the movable mould base plate 9, the connecting end of the servo sealing component 13 is fixed on the servo frame 3, and the sealing end of the servo sealing component 13 is positioned in the middle hole of the movable mould base plate 9; the movable sealing component 4 is arranged on the base 1 through a sliding block and a sliding rail; a forming die A is arranged on the fixed die base plate 6 around the middle hole, and a forming die B is arranged on the movable die base plate 9 around the middle hole; wherein the follow-up frame 3 can be replaced to adapt to forming pieces with different lengths; the fixed support frame 2 for supporting the fixed plate A5 and the fixed die seat plate 6 can also be replaced for adapting to initial blanks with different lengths.

with reference to fig. 5-7, the forming mold a is formed by at least two split assemblies A7; the split assembly A7 comprises a split sliding plate A7.1 and a forming part A7.5 on the split sliding plate A, the forming part A7.5 is in a partial ring shape, the split sliding plate A7.1 comprises a sliding tail plate 7.12 with a guiding function and a crescent plate 7.11 at the front end, the sliding tail plate 7.12 is inserted into a sliding groove of the fixed seat block 7.2, the split cylinder 7.3 is fixed on the fixed seat block 7.2, and a piston rod of the split cylinder A7.3 is connected with an ear plate 7.4 on the split seat block 7.2; a necking inclined surface 7.53 is arranged on the joint side of the inner wall of the forming part A7.5 and the split sliding plate A, a forming half cavity A7.51 is arranged on the forming end surface of the forming part A7.5, a transition surface 7.53 is arranged from the necking inclined surface 7.53 to the forming half cavity A7.51, and a complete ring cavity is split by the split assembly A7; the cross-section of the mold half A7.51 includes transition arc 7.511, sidewall arc 7.512, shoulder arc 7.513, and top arc 7.514.

With reference to fig. 8-10, the forming mold B includes at least two split assemblies B10, the split assemblies B10 include a crescent ring B10.1, a guide sliding plate B is disposed on an outer annular wall of the crescent ring B10.1, the guide sliding plate B is inserted into a slot of the fixing seat B10.2, the split cylinder B10.3 is fixed on the early fixing seat B10.2, an end of a piston rod of the split cylinder B10.3 is connected with an ear plate B10.4 on the crescent ring B10.1, a forming portion B10.5 is mounted on an inner ring of the crescent ring B10.1, and a forming half cavity mirrored with the forming half cavity a7.51 is disposed on an end surface of the split of the forming portion B10.5 and the forming portion a 7.5.

With reference to fig. 11-13, the movable sealing assembly 4 includes a counterweight seat 4.1, a slider is installed at the bottom of the counterweight seat 4.1, a connecting rod a4.2 is installed at the top of the counterweight seat 4.1, a sealing head a4.3 is installed at the end of the connecting rod a4.2, the sealing head a4.3 is barrel-shaped, a raised sealing ring seat a4.31 is arranged at the outer side of the barrel edge of the sealing head a4.3, two deep and shallow sealing grooves are arranged on the sealing ring seat a4.31, a sealing ring 4.34 is installed in the shallow sealing groove, an annular inflatable air bag 4.32 is installed in the deep sealing groove, and a sealing ring a4.33 is sleeved at the outer side of the inflatable air bag 4.32. A special air pipe is arranged in a supporting connecting rod cavity connected to the center of the sealing head A4.3 and used for ventilating the sealing head A4.3.

With reference to fig. 14, the follower sealing assembly 13 includes a barrel-shaped sealing head B13.1, and the sealing head B13.1 is fixedly mounted on the follower fixing plate 13.3 through a fixing connecting rod 13.2. The follow-up fixing plate 13.3 is fixed on the follow-up frame 3. A special air pipe is arranged in the cavity of the fixed connecting rod 13.2 and used for ventilation of the sealing head B13.1.

With reference to fig. 15, the apparatus further comprises a pressure system and an electrical control system.

A processing method of a metal corrugated pipe comprises the following steps:

step 1, feeding: placing the pipe 100 on an arc-shaped material supporting part of a support frame 12 on a rack 1, wherein rollers are arranged on the arc-shaped material supporting part of the support frame 12, and the support frame 12 has a lifting function and pushes the pipe 100 to pass through middle holes of a fixing plate A5 and a fixed die base plate 6; the movable sealing component 4 acts, the counterweight seat 4.1 moves on the slide rail to drive the sealing head A4.3 at the end part of the connecting rod A4.2 to move and be inserted in the center of the pipe 100, and the relative position of the sealing head A4.3 of the movable sealing component 4 and the sealing head B13.1 of the follow-up sealing component 13 is determined according to the wavelength of the forming wave and is deep into the forming die A; the pressure system 101 is started under the control of the electrical control system 102, the pressure system 101 supplies air to the expansion air bag 4.32, the sealing ring A4.33 is supported by the expansion air bag 4.32 after expansion and is jointed with the inner wall of the pipe 100 to form sealing, the forming die A on the fixed die base plate 6 acts, the forming part A7.5 of the forming die A is driven by the splicing air cylinder 7.3 to be matched, and a complete forming die A is spliced; the complete forming die A and the sealing head A4.3 clamp and seal the pipe; a supporting cylinder 14 is arranged at the center of the fixing plate A5, a sealing ring is arranged at the inner end of the supporting cylinder 14, and the supporting cylinder 14 has the functions of supporting and sealing;

the displacement of the movable sealing component 4 and the fixed die base plate 6 should be consistent or have an error of several millimeters, and the main function is to determine the position of a sealing head 4.3 of the sealing component 4, ensure the wavelength and recalibrate a zero position when the error is more than 5 mm. The zero position calibration method comprises the following steps: set up the location mark on frame 2 and on the counter weight seat or the connecting rod A of removal seal assembly 4, can be locating pin and locating hole, after advancing cover half bedplate 6 to the position that is greater than upper and lower spacing nut pendulum-in, when reaching the maximum clearance between cover half bedplate 6 and the fixed plate A5, through the position between removal cover half bedplate 6 control seal head B and the seal head A, guarantee the wavelength, with upper and lower spacing nut pendulum-in, upper and lower spacing nut is used for fixing the cover half bedplate, cover half bedplate 6 is retreated to upper and lower spacing position and is guaranteed to closely paste with upper and lower spacing nut and lean on, record cover half bedplate 6 displacement this moment, and record this displacement as the position of zero point skew, carry out zero point calibration. The upper and lower limiting nuts are positioned at two sides of the fixed die base plate 6. Different wavelengths can be realized by adjusting the length of the upper limit and the lower limit.

Step 2, pre-mold assembly: the hydraulic cylinder 15 pushes the movable die base plate 9 to move, the follow-up frame 3 fixed on the movable die base plate 9 moves along with the movable die base plate 9, the follow-up sealing assembly 13 moves along with the follow-up frame 3 and the movable die base plate 9, the movement is stopped when the distance between the movable die base plate 9 and the fixed die base plate 6 reaches a set distance, the follow-up sealing assembly 13 moves along with the movable frame 3 and is inserted into the pipe 100, the outer ring of the sealing head B is provided with a sealing structure which is the same as that of the sealing head A, the pressure system 101 inflates air into an expansion air bag in the pressure system to drive a sealing ring of the outer ring to expand outwards and seal the inner wall of the pipe 100, the forming die B on the movable die base plate 9 acts, and the forming portion B10.5 of the forming die B is spliced into a complete forming die B under the driving of the splicing assembly B10.1 of the forming die B; the tube 100 is clamped and sealed by the complete forming die B and a sealing head B13.3 of the follow-up sealing component 15; the center of the complete forming die B is in a closed ring shape;

and 3, adopting an axial upsetting forming technology, and bending deformation forming under the combined action of axial supply and internal pressure of the die: the pressure inside the seal section and the axial makeup length are precisely controlled depending on the material of the tubing 100 and the wall thickness. When pressurizing, the electric control system 102 controls the pressure system 101 to charge pressure between the sealing head A and the sealing head B from the centers of the connecting rod 4.21 and the fixed connecting rod 13.2 of the sealing head A, the corresponding position of the pipe 100 is deformed under the action of internal pressure to achieve the purpose of preforming, and meanwhile, the movable mold base plate 9 moves towards the fixed mold base plate 6 under the pushing of the hydraulic cylinder 15, so that the relative movement of the forming mold A and the forming mold B is realized, the purpose of axial material supplement is achieved, and the forming mold A is attached to the forming mold B to complete the forming of a corrugation.

In order to enable automation, a step 4 may also be added,

automatic continuous forming: after the mold A and the mold B are closed, the first wave is completed, 4.32 and 13.13 are exhausted and decompressed after the internal part of the sealing area is exhausted and decompressed until no pressure exists, then A3-segment mold of the mold A is opened, the mold B is still closed, the formed pipe 100 is driven to move backwards by moving the mold plate seat 9, then an expansion air bag 4.32 of the movable sealing component 4 is filled with low-pressure air to fix the formed pipe, then A3-segment mold of the mold B is opened, and the pipe and the follow-up sealing component 13 enter a region to be formed for next forming under the drive of the movable mold plate seat 9, and the purpose of continuous production is achieved through cycle operation.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the present invention, which is intended to cover any modifications, equivalents, improvements, etc. within the spirit and scope of the present invention.

Claims

1. The utility model provides an equip for major diameter corrugated metal pipe axial upset is taken shape, includes base (1), its characterized in that, install fixed plate A (5) and fixed plate B (8) on base (1), install cover half bedplate (6) and movable mould bedplate (9) between fixed plate A (5) and fixed plate B (8), fixed plate A (5), fixed plate B (8), cover half bedplate (6) and movable mould bedplate (9) all have the mesopore, fixed plate B (8), fixed plate A (5), cover half bedplate (6) and movable mould bedplate (9) are through connecting beam column (11) and concatenating an organic whole, and movable mould bedplate (9) slidable mounting is on connecting beam column (11), the piston rod end of pneumatic cylinder (15) fixedly mounted on fixed plate B (8) is connected with movable mould bedplate (9); the servo-actuated frame (3) is fixed on the movable mould base plate (9), the connecting end of the servo-actuated sealing component (13) is fixed on the servo-actuated frame (3), and the sealing end of the servo-actuated sealing component (13) is positioned in the central hole of the movable mould base plate (9); the movable sealing component (4) is arranged on the base (1) through a sliding block and a sliding rail; a forming die A is installed on the fixed die base plate (6) around the middle hole, and a forming die B is installed on the movable die base plate (9) around the middle hole.

2. The equipment for the axial upsetting forming of large-diameter metal corrugated tube as recited in claim 1, wherein said forming die a is composed of at least two split assemblies a (7); the split assembly A (7) comprises a split sliding plate A (7.1) and a forming part A (7.5) on the split sliding plate A, the forming part A (7.5) is in a local ring shape, the split sliding plate A (7.1) comprises a sliding tail plate (7.12) with a guiding function and a crescent plate (7.11) at the front end, the sliding tail plate (7.12) is inserted into a sliding groove of the fixed seat block (7.2), the split air cylinder A (7.3) is fixed on the fixed seat block (7.2), and a piston rod of the split air cylinder A (7.3) is connected with an ear plate (7.4) on the split seat block (7.2); the inner wall of the forming part A (7.5) and the joint side of the split sliding plate A are provided with necking inclined planes (7.53), the forming end face of the forming part A (7.5) is provided with a forming half cavity A (7.51), and transition surfaces (7.53) from the necking inclined planes (7.53) to the forming half cavity A (7.51) are provided.

3. Equipment for the axial upsetting forming of large diameter metal bellows according to claim 2, wherein said split assembly a (7) splits a complete annular cavity.

4. Equipment for the axial upsetting forming of large-diameter metal bellows according to claim 2 or 3, characterized in that the section of said forming half-cavity A (7.51) comprises an over-arc (7.511), a side wall arc (7.512), a shoulder arc (7.513) and a top arc (7.514).

5. The equipment for large-diameter metal corrugated pipe axial upsetting forming of claim 4, wherein the forming die B comprises at least two split assemblies B (10), each split assembly B (10) comprises a crescent ring B (10.1), a guide sliding plate B is arranged on the outer ring wall of each crescent ring B (10.1), a guide ring plate B is inserted into a slot of a fixed seat B (10.2), a split cylinder B (10.3) is fixed on an early fixed seat B (10.2), the end of a piston rod of the split cylinder B (10.3) is connected with an ear plate B (10.4) on the crescent ring B (10.1), a forming part B (10.5) is arranged on the inner ring of the crescent ring B (10.1), and a forming half cavity which is in mirror phase with the forming half cavity A (7.51) is arranged on the end face where the forming part B (10.5) and the forming part A (7.5) are split.

6. The equipment for large-diameter metal corrugated pipe axial upsetting forming as recited in claim 5, wherein the movable sealing assembly (4) comprises a counterweight seat (4.1), the slider is installed at the bottom of the counterweight seat (4.1), a connecting rod A (4.2) is installed at the top of the counterweight seat (4.1), a sealing head A (4.3) is installed at the end of the connecting rod A (4.2), the sealing head A (4.3) is barrel-shaped, a raised sealing ring seat A (4.31) is arranged at the outer side of the barrel edge of the sealing head A (4.3), two deep and shallow sealing grooves are arranged on the sealing ring seat A (4.31), a sealing ring (4.34) is installed in the shallow sealing groove, an annular expansion air bag (4.32) is installed in the deep sealing groove, and the sealing ring A (4.33) is sleeved at the outer side of the expansion air bag (4.32).

7. The equipment for the axial upsetting forming of the large-diameter metal corrugated pipe as recited in claim 6, wherein the follow-up seal assembly (13) comprises a barrel-shaped seal head B (13.1), and the seal head B (13.1) is fixedly mounted on a follow-up fixing plate (13.3) through a fixing connecting rod (13.2).

8. Equipment for the axial upsetting forming of large-diameter metal corrugated tubes as in claim 7, wherein said apparatus further comprises a pressure system (101) and an electrical control system (102).

9. A processing method of a metal corrugated pipe is characterized by comprising the following steps:

step 1, feeding: placing a pipe (100) on an arc-shaped material supporting part of a support frame (12) on a rack (1), wherein the arc-shaped material supporting part of the support frame (12) is provided with a roller, and pushing the pipe (100) to pass through a middle hole of a fixed plate A (5) and a fixed die base plate (6); the movable sealing component (4) moves, and moves on the slide rail through the counterweight seat (4.1) to drive the sealing head A (4.3) at the end part of the connecting rod A (4.2) to move and be inserted in the center of the pipe (100) and penetrate into the forming die A; a forming mold A on the fixed mold seat plate (6) acts, a forming part A (7.5) of the forming mold A is driven by the splicing cylinder A (7.3) to be matched, and a complete forming mold A is spliced; one end of the pipe (100) is clamped and sealed by the complete forming die A and the sealing head A (4.3);

step 2, pre-mold assembly: the hydraulic cylinder (15) pushes the movable mold base plate (9) to move, the movable mold base plate (9) moves along with the movable seal assembly (13), the moving is stopped when the distance between the movable mold base plate (9) and the fixed mold base plate (6) reaches a set distance, the forming mold B on the movable mold base plate (9) acts, and the forming part B (10.5) is spliced into a complete forming mold B under the driving of the splicing air cylinder B (10.1) by the splicing assembly B (10) of the forming mold; the other end of the pipe (100) is clamped and sealed by the complete forming die B and a sealing head B (13.1) of the follow-up sealing component (13);

and 3, bending, deforming and molding under the combined action of the mold and the internal pressure: when the die A and the die B as well as the corresponding movable sealing assembly (4) and the corresponding follow-up sealing assembly (13) move to set positions, a sealed cavity is formed by the tube blank and the sealing assembly, inert gas with pressure larger than the yield pressure of the tube blank is filled into the tube blank, so that the material in a deformation area of the tube blank is subjected to yield and bending deformation, the tube blank pushes the movable die base plate (9) and the forming die B on the movable die base plate (9) and the follow-up sealing assembly (13) to move together through a hydraulic cylinder (15) under the supporting action of forming internal pressure, axial feeding is provided to enable the sealing part of the tube blank to generate bending deformation and gradually attach to a die cavity formed by the die A and the die B until the dies are all attached tightly, and the sealing part of the tube blank finishes final die attachment under the action of the bending pressure and the forming internal pressure provided by the movable die;

the method is used for molding in a mode of pressurizing and axially supplying until die assembly, and the pressure inside the sealing section, the die assembly speed and the axial supply length are controlled according to the material of the pipe (100) and the thickness of the pipe wall.