CN109277445B - Fluid pressure forming device and method for metal corrugated pipe - Google Patents
Fluid pressure forming device and method for metal corrugated pipe Download PDFInfo
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- CN109277445B CN109277445B CN201811330102.4A CN201811330102A CN109277445B CN 109277445 B CN109277445 B CN 109277445B CN 201811330102 A CN201811330102 A CN 201811330102A CN 109277445 B CN109277445 B CN 109277445B
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- 239000002184 metal Substances 0.000 title claims abstract description 74
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 74
- 239000012530 fluid Substances 0.000 title claims abstract description 67
- 238000000034 method Methods 0.000 title claims abstract description 25
- 230000002902 bimodal effect Effects 0.000 claims description 12
- 230000000712 assembly Effects 0.000 claims description 11
- 238000000429 assembly Methods 0.000 claims description 11
- 238000001125 extrusion Methods 0.000 claims description 9
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 description 7
- 229910001069 Ti alloy Inorganic materials 0.000 description 3
- 229910000601 superalloy Inorganic materials 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000011089 mechanical engineering Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D15/00—Corrugating tubes
- B21D15/04—Corrugating tubes transversely, e.g. helically
- B21D15/10—Corrugating tubes transversely, e.g. helically by applying fluid pressure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/10—Die sets; Pillar guides
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
A fluid pressure forming device and method for a metal corrugated pipe solve the problems that the rigidity and the service life of the corrugated pipe are affected due to obvious wall thickness reduction at the wave crest of a finished corrugated pipe prepared by the prior art. Including parallel arrangement's movable mould bedplate and cover half bedplate, its characterized in that: a movable pressing die is arranged on one side of the movable die seat plate, facing the fixed die seat plate, and is connected with a pressing die driving device arranged on the movable die seat plate; a fixed pressing die is arranged on one side of the fixed die seat plate, which faces the movable die seat plate, and a fluid through hole of the fixed pressing die is communicated with a fluid loading and unloading port on the fixed die seat plate; the movable die assembly and the forming die assembly which are arranged between the movable die and the fixed die and are mutually staggered are respectively connected with a die driving device. The corrugated pipe has reasonable design and compact structure, can adjust the uniformity of the thickness distribution of the corrugated pipe wall after forming, effectively improves the phenomenon of obvious thinning at the wave crest in the conventional forming process, and can obviously improve the service performance of the metal corrugated pipe.
Description
Technical Field
The invention belongs to the technical field of mechanical engineering, and particularly relates to a metal corrugated pipe fluid pressure forming device and method capable of adjusting uniformity of thickness distribution of a formed corrugated pipe wall, effectively improving the phenomenon of obvious thinning at a wave crest in a conventional forming process and remarkably improving usability of a metal corrugated pipe.
Background
The existing forming process of the corrugated pipe, in particular to a precise metal corrugated pipe, mainly adopts normal-temperature hydraulic forming or air pressure forming under the high-temperature condition, namely: the plastic deformation of the tube blank is performed by the pressure of the fluid in the tube blank and the restraint of an external mold. The traditional forming mode is to firstly form a primary wave under the action of certain fluid pressure, then axially compress a tube blank to obtain a larger corrugated outer diameter while keeping certain internal pressure, then perform pressure maintaining unloading, and finally open a die to take out and form. However, the corrugated pipe manufactured by the traditional method has obvious wall thickness reduction at the wave crest due to the characteristics of the technology, so that the rigidity of the corrugated pipe and the service life under the working load are seriously influenced.
In addition, due to the excellent strength, rigidity, corrosion resistance and other properties of materials such as titanium alloy, superalloy and the like, the titanium alloy and superalloy are increasingly applied to the corrugated pipe industry; however, it has been proved that these metal materials with poor plasticity are difficult to withstand excessive thinning at the peaks when conventional hydroforming is employed, and are easily damaged, resulting in low yield. There is a need for improvements in the manner and apparatus of fluid pressure forming of existing corrugated metal tubing.
Disclosure of Invention
The invention aims at the problems, and provides a metal corrugated pipe fluid pressure forming device and a metal corrugated pipe fluid pressure forming method which can adjust the uniformity of the thickness distribution of a formed corrugated pipe wall, effectively improve the phenomenon of obvious thinning at a wave crest in the conventional forming process and remarkably improve the service performance of the metal corrugated pipe.
The technical scheme adopted by the invention is as follows: the metal bellows fluid pressure forming device comprises a movable die base plate and a fixed die base plate which are arranged in parallel, wherein the fixed die base plate is connected with the movable die base plate through a connecting column and a connecting frame, and is characterized in that: the middle part of one side of the movable die seat plate, which faces the fixed die seat plate, is provided with a movable die which is connected with the telescopic end of a die driving device arranged on the movable die seat plate; the middle part of one side of the fixed die seat plate, which faces the movable die seat plate, is provided with a fixed die, and a fluid through hole in the middle part of the fixed die is communicated with a fluid loading and unloading port on the fixed die seat plate; a movable die plate assembly and a forming die plate assembly are arranged between the movable die plate and the fixed die plate, the dies of the movable die plate assembly and the forming die plate assembly are arranged in a staggered manner, a metal tube blank to be formed is arranged in the middle of the forming die plate assembly and the movable die plate assembly, and two ends of the metal tube blank are respectively connected with the movable die plate and the fixed die plate; and the movable die plate assembly is connected with the telescopic end of the movable die plate driving device arranged on the connecting frame along the radial direction of the tube blank, and the forming die plate assembly is connected with the telescopic end of the forming die plate driving device arranged on the connecting frame along the radial direction of the tube blank.
The movable die assembly consists of two parts which are symmetrically arranged up and down and have the same structure, each part comprises a die connecting shaft, and a plurality of semicircular movable dies are arranged on the die connecting shaft; and the middle part of the die connecting shaft is connected with the telescopic end of the movable die driving device. The semi-circular movable die of the movable die assembly is driven by the movable die driving device to move along the radial direction of the tube blank so as to control the deformation sequence of materials among the dies.
The semicircular movable die comprises a semicircular movable die main body, wherein a mounting hole is formed in the middle of one side of the circular arc edge of the movable die main body, a forming part I is arranged in the middle of one side of the straight edge of the movable die main body, and guide post avoidance openings are respectively formed in two ends of the movable die main body.
The die connecting shaft is composed of a connecting shaft main body, a plurality of die mounting parts are arranged on the connecting shaft main body, and forming piece avoiding grooves are formed in positions, between two adjacent die mounting parts, on the connecting shaft main body.
The forming die piece assembly consists of two parts which are symmetrically arranged left and right and have the same structure, each part comprises a die guide post, and a plurality of semicircular forming die pieces are arranged on the die guide post in a sliding manner; the ends of the die guide posts are connected to telescoping ends of the shaped die drive. The semicircular forming die plates of the two forming die plate assemblies are driven by the forming die plate driving device to move along the radial direction of the tube blank.
The semicircular forming die sheet consists of a semicircular forming die sheet main body, a guide post jack is arranged in the middle of one side of the circular arc edge of the forming die sheet main body, a forming part II is arranged in the middle of one side of the straight edge of the forming die sheet main body, and two ends of the forming die sheet main body are respectively provided with a connecting shaft avoiding notch; the semicircular forming die piece is arranged on the die guide post in a sliding way through the guide post jack.
The side part of the forming part II of the semicircular forming die plate is provided with a forming concave table. To facilitate the final formation of the corrugations of the metal blank.
The method for carrying out fluid pressure forming by utilizing the metal bellows fluid pressure forming device comprises the following steps:
step one, placing a metal pipe blank to be formed between a movable pressing die and a fixed pressing die of a metal corrugated pipe fluid pressure forming device, and sealing two ends of the pipe blank; then, the movable die plate assembly and the forming die plate assembly are driven to move towards the metal tube blank and to be clamped by a movable die plate driving device and a forming die plate driving device which are arranged on the connecting frame, and the die is locked; meanwhile, gaskets for adjusting the distance are respectively arranged between the semicircular movable die of the movable die assembly and the semicircular forming die of the forming die assembly;
step two, applying a certain fluid pressure load to the inside of a metal pipe blank through a fluid loading and unloading port of a fixed die seat plate and a fluid through hole of a fixed die, and unloading the metal pipe blank, and forming a bimodal primary wave by utilizing the co-extrusion of a forming part I of a semicircular movable die of the movable die assembly and a forming part II of a semicircular forming die of the movable die assembly;
driving the movable die assemblies on the upper side and the lower side of the metal tube blank to move outwards along the radial direction of the tube blank respectively by a movable die driving device so as to separate the semicircular movable die of the movable die assembly from the metal tube blank and facilitate the follow-up pressing of the movable die on the semicircular forming die of the forming die assembly; then, applying a certain fluid pressure load, and forming a unimodal shaped primary wave by utilizing the single extrusion of the forming part II of the semicircular forming die of the forming die assembly;
regulating and maintaining the fluid pressure in the metal tube blank, driving the movable die to move along the axially arranged die guide column and towards the fixed die by the die driving device on the movable die base plate, further enabling all semicircular forming dies of the forming die assembly to contact each other, and forming waves by utilizing extrusion of a forming concave table at the side part of the semicircular forming die forming part II;
step five, unloading the fluid pressure from a fluid loading and unloading port of the fixed die seat plate, and then driving the movable die to axially retract to an initial position far away from the fixed die by using a die driving device; forming die assemblies on the left side and the right side of the metal tube blank are driven by a forming die driving device to move outwards along the radial direction of the tube blank respectively; and taking out the formed metal corrugated pipe.
And step two, after the bimodal primary wave is formed, removing all or part of the gaskets, applying a certain fluid pressure load and maintaining pressure, and then, driving the movable die to move for a certain distance along the axial direction by the die driving device, and unloading to flatten the bimodal primary wave.
The invention has the beneficial effects that: because the movable die seat plate and the fixed die seat plate which are arranged in parallel are adopted, the middle part of one side of the movable die seat plate, which faces the fixed die seat plate, is provided with the movable die, and the movable die is connected with the telescopic end of the die driving device arranged on the movable die seat plate; a fixed pressing die is arranged in the middle of one side of the fixed die seat plate, which faces the movable die seat plate, and a fluid through hole in the middle of the fixed pressing die is communicated with a fluid loading and unloading port on the fixed die seat plate; a movable die assembly and a forming die assembly with mutually staggered dies are arranged between the movable die and the fixed die, and a metal tube blank is arranged in the middle of the forming die assembly and the movable die assembly; the movable die assembly is connected with the flexible end of the movable die driving device arranged along the radial direction of the tube blank, and the forming die assembly is connected with the flexible end of the forming die driving device arranged along the radial direction of the tube blank, so that the design is reasonable, the structure is compact, and the deformation sequence of materials among dies is controlled by a step-by-step combined forming mode of the movable die assembly and the forming die assembly, namely: in the fluid pressure forming process of the metal corrugated pipe, a bimodal primary wave is formed firstly, then a unimodal primary wave is formed, and therefore the wall thickness of the material along the bus direction is more uniform under the condition of the same primary wave bus length, and the phenomenon that the wave crest is obviously thinned in the first-step unimodal primary wave forming process in the conventional two-step hydraulic forming mode is effectively improved. The device and the method for forming the corrugated metal pipe by fluid pressure not only improve the uniformity of the thickness distribution of the corrugated metal pipe after forming and improve the service performance and service life of the corrugated metal pipe, but also are beneficial to forming the corrugated metal pipe made of materials with poor plasticity such as titanium alloy, superalloy and the like, and have wide application prospect.
Drawings
Fig. 1 is a schematic view of a structure of the present invention.
Fig. 2 is a cross-sectional view of the internal structure of fig. 1.
Fig. 3 is a simplified schematic diagram of the removal of the attachment frame, movable die drive, and shaped die drive of fig. 1.
Fig. 4 is a cross-sectional view of the internal structure of fig. 3.
Fig. 5 is a schematic cross-sectional view of the metal shell of fig. 4 deformed to form a bimodal primary wave.
Fig. 6 is a schematic view showing a use state in which the movable die assemblies on the upper and lower sides of the metal shell in fig. 3 are moved radially outward of the shell, respectively.
Fig. 7 is a sectional view of the internal structure of fig. 6.
Fig. 8 is a schematic cross-sectional view of the metal shell of fig. 7 in deforming when a unimodal shaped primary wave is formed.
Fig. 9 is a schematic diagram of a configuration of the movable die assembly of fig. 6.
Fig. 10 is a schematic view of a structure of the semi-circular movable die of fig. 9.
Fig. 11 is a schematic structural view of the die-attach shaft of fig. 9.
Fig. 12 is a schematic view of one configuration of the shaped die assembly of fig. 6.
Fig. 13 is a schematic view of one configuration of the semi-circular shaped die of fig. 12.
Fig. 14 is an a-direction view of fig. 13.
Figure 15 is a schematic view of the die drive of figure 6 in a use position to drive the movable die toward the stationary die and to form the semi-circular shaped die of the die assembly into contact with each other.
Fig. 16 is a sectional view of the internal structure of fig. 15.
Fig. 17 is a schematic cross-sectional view of the metal shell of fig. 16 deformed during the formation of the corrugations.
Fig. 18 is a schematic view of the forming die assemblies of the left and right sides of the metal blank of fig. 15 respectively moved radially outwardly of the blank.
The serial numbers in the figures illustrate: a movable die plate 1, a movable die 2, a movable die driving device 3, a movable die assembly 4, a fixed die 5, a fixed die 6, a connecting column 7, a forming die driving device 8, a forming die assembly 9, a connecting frame 10, a die driving device 11, a metal tube blank 12, a die guide column 13, a fluid loading and unloading port 14, a die connecting shaft 15, a semicircular movable die 16, a movable die body 17, a mounting hole 18, a forming part I19, a guide column avoiding notch 20, a connecting shaft body 21, a die mounting part 22, a forming plate avoiding groove 23, a semicircular forming die 24, a forming die body 25, a guide column jack 26, a forming part II 27, a connecting shaft avoiding notch 28 and a forming concave table 29.
Detailed Description
The specific structure and method of the present invention will be described in detail with reference to fig. 1 to 18. The metal bellows fluid pressure forming device comprises a movable die base plate 1 and a fixed die base plate 5 which are arranged in parallel, wherein the fixed die base plate 5 is connected with the movable die base plate 1 through a plurality of connecting columns 7 and connecting frames 10. The middle part of one side of the movable die seat plate 1 facing the fixed die seat plate 5 is provided with a movable die 2 for pressing semicircular forming dies 24 of the forming die assembly 9; the movable die 2 is connected with the telescopic end of a die driving device 11 arranged on the movable die holder plate 1. The fixed die seat plate 5 faces the middle part of one side of the movable die seat plate 1, and a fixed die 6 is arranged; the fluid through hole in the middle of the fixed die 6 is communicated with the fluid loading and unloading port 14 on the fixed die seat plate 5. Between the movable die 2 and the fixed die 6, a movable die assembly 4 and a forming die assembly 9 are arranged with dies staggered with each other, a metal tube blank 12 to be formed is arranged in the middle of the forming die assembly 9 and the movable die assembly 4, and two ends of the metal tube blank 12 are respectively connected with the movable die 2 and the fixed die 6.
The movable die assembly 4 is composed of two parts which are arranged symmetrically up and down and have the same structure, each part comprises a die connecting shaft 15 which is arranged along the axial direction of the tube blank, the die connecting shaft 15 is composed of a connecting shaft main body 21, a plurality of die mounting parts 22 are arranged on the connecting shaft main body 21, and a forming piece avoiding groove 23 which is used for being matched with the forming die assembly 9 is arranged on the connecting shaft main body 21 and between two adjacent die mounting parts 22. The plurality of die mounting portions 22 of the die-connecting shaft 15 are provided with semicircular movable dies 16, respectively. The semicircular movable die 16 is composed of a semicircular movable die main body 17, a mounting hole 18 is formed in the middle of one side of the circular arc edge of the movable die main body 17, a forming part I19 is formed in the middle of one side of the straight edge of the movable die main body 17, and guide post avoidance notches 20 are formed at two ends of the movable die main body 17 respectively. The middle part of the die connecting shaft 15 of the movable die assembly 4 is connected with the telescopic end of the movable die driving device 3 arranged on the connecting frame 10 along the radial direction of the tube blank; and the semicircular movable die 16 of the two parts of the movable die assembly 4 are driven by the movable die driving device 3 to move along the radial direction of the tube blank so as to control the deformation sequence of materials among the dies.
The forming die assembly 9 is composed of two parts which are symmetrically arranged left and right and have the same structure, each part comprises a die guide post 13 which is axially arranged along the tube blank, and a plurality of semicircular forming dies 24 are slidably arranged on the die guide post 13. The semicircular forming die piece 24 is composed of a semicircular forming die piece main body 25, a guide post jack 26 is arranged in the middle of one side of the circular arc edge of the forming die piece main body 25, a forming part II 27 is arranged in the middle of one side of the straight edge of the forming die piece main body 25, and a forming concave table 29 which is convenient for the final forming of the corrugation of the metal tube blank 12 is arranged on the side of the forming part II 27; the formed die body 25 is provided with a connecting shaft relief notch 28 at each end. The semicircular forming dies 24 are respectively arranged on the compression mold guide posts 13 in a sliding manner through guide post insertion holes 26. The end of the compression mould guide post 13 of the forming mould sheet assembly 9 is connected with the telescopic end of the forming mould sheet driving device 8 which is arranged on the connecting frame 10 along the radial direction of the tube blank; thereby utilizing the forming die driving device 8 to respectively drive the semicircular forming die 24 of the two parts of the forming die assembly 9 to move along the radial direction of the tube blank so as to facilitate the extrusion forming of the metal tube blank 12 and the taking-out of the formed tube blank.
A method for fluid pressure forming using the metal bellows fluid pressure forming apparatus:
step one, placing a metal pipe blank 12 to be formed between a movable die 2 and a fixed die 6 of a metal corrugated pipe fluid pressure forming device, and sealing two ends of the pipe blank; then, the movable die assembly 4 and the forming die assembly 9 are moved to the metal blank 12 by the movable die driving device 3 and the forming die driving device 8 provided on the connecting frame 10, respectively, to perform die closing, and to lock the die (as shown in fig. 1, 2 and fig. 3, 4). At the same time, shims for adjusting the pitch are provided between the semicircular movable die 16 of the movable die assembly 4 and the semicircular shaped die 24 of the shaped die assembly 9, respectively.
Step two, a certain fluid pressure load is applied to the inside of the metal blank 12 and unloaded (the fluid pressure is dependent on the type of material and the design size of the bellows) via the fluid loading and unloading port 14 of the stationary die plate 5 and the fluid through hole of the stationary die 6, and a bimodal primary wave is formed by co-extrusion of the forming section i 19 of the semicircular movable die 16 of the movable die assembly 4 and the forming section ii 27 of the semicircular forming die 24 of the forming die assembly 9 (as shown in fig. 5). After the bimodal primary wave is formed, removing all or part of gaskets, and then applying a certain fluid pressure load and maintaining pressure; then, the die driving device 11 drives the movable die 2 to move a certain distance along the axial direction, and then the die is unloaded; so as to initially crush the bimodal primary wave by axial movement (the flattening of the bimodal primary wave can be omitted according to the forming requirement).
Step three, the movable die assemblies 4 on the upper side and the lower side of the metal tube blank 12 are driven by the movable die driving device 3 to move outside the outer circumference of the closed forming die assembly 9 along the radial outer side of the tube blank respectively (as shown in fig. 6 and 7), so that the semicircular movable die 16 of the movable die assembly 4 is separated from the metal tube blank 12, and meanwhile, the movable die 2 is convenient for pressing the semicircular forming die 24 of the forming die assembly 9. A fluid pressure load is then applied to the interior of the metal blank 12 via the fluid loading and unloading port 14 to form a unimodal shaped primary wave (as shown in fig. 8) by single extrusion of the forming section ii 27 of the semicircular forming die 24 of the forming die assembly 9.
Regulating and maintaining the fluid pressure in the metal tube blank 12, wherein the increasing amplitude of the fluid pressure is not more than 10% of the fluid pressure in the third step; subsequently, the movable die 2 is driven by the die driving means 11 on the movable die plate 1 to move along the axially arranged die guide posts 13 toward the fixed die 6, so that the semicircular forming dies 24 of the forming die assembly 9 are brought into contact with each other (as shown in fig. 15 and 16), and the forming recess 29 on the side of the forming portion ii 27 of the semicircular forming die 24 is pressed to form the waves (as shown in fig. 17).
Step five, unloading the fluid pressure from a fluid loading and unloading port 14 of the fixed die seat plate 5, and then driving the movable die 2 to axially retract to an initial position far away from the fixed die 6 by using a die driving device 11; forming die assemblies 9 on the left side and the right side of the metal tube blank 12 are driven by a forming die driving device 8 to move outwards along the radial direction of the tube blank respectively; the metal bellows after the completion of the forming is taken out (as shown in fig. 18). It will be appreciated that the shaped die assembly 9 may also be designed to be axially removed along with the metal bellows, depending on the particular application.
Claims (8)
1. A method for forming a metal bellows by fluid pressure, which is characterized in that: the device comprises a movable die seat plate (1) and a fixed die seat plate (5) which are arranged in parallel, wherein the fixed die seat plate (5) is connected with the movable die seat plate (1) through a connecting column (7) and a connecting frame (10), a movable die (2) is arranged in the middle of one side of the movable die seat plate (1) facing the fixed die seat plate (5), and the movable die (2) is connected with a telescopic end of a die driving device (11) arranged on the movable die seat plate (1); the middle part of one side of the fixed die seat plate (5) facing the movable die seat plate (1) is provided with a fixed die (6), and a fluid through hole in the middle part of the fixed die (6) is communicated with a fluid loading and unloading port (14) on the fixed die seat plate (5); a movable die plate assembly (4) and a forming die plate assembly (9) which are arranged in a staggered manner are arranged between the movable die plate (2) and the fixed die plate (6), a metal tube blank (12) to be formed is arranged in the middle of the forming die plate assembly (9) and the movable die plate assembly (4), and two ends of the metal tube blank (12) are respectively connected with the movable die plate (2) and the fixed die plate (6); the movable die plate assembly (4) is connected with the telescopic end of the movable die plate driving device (3) arranged on the connecting frame (10) along the radial direction of the tube blank, and the forming die plate assembly (9) is connected with the telescopic end of the forming die plate driving device (8) arranged on the connecting frame (10) along the radial direction of the tube blank;
the method comprises the following steps:
firstly, placing a metal tube blank (12) to be formed between a movable pressing die (2) and a fixed pressing die (6) of a metal corrugated tube fluid pressure forming device, and sealing two ends of the tube blank; then, the movable die plate assembly (4) and the forming die plate assembly (9) are driven to move and be clamped to the metal tube blank (12) through a movable die plate driving device (3) and a forming die plate driving device (8) which are arranged on the connecting frame (10), and the die is locked; at the same time, gaskets for adjusting the distance are respectively arranged between the die of the movable die assembly (4) and the die of the forming die assembly (9);
step two, applying a certain fluid pressure load to the inside of the metal tube blank (12) through a fluid loading and unloading port (14) of the fixed die seat plate (5) and a fluid through hole of the fixed die (6) for unloading, and forming a bimodal primary wave by utilizing the co-extrusion of the movable die plate assembly (4) and the forming die plate assembly (9);
step three, driving the movable die assemblies (4) on the upper side and the lower side of the metal tube blank (12) through the movable die driving device (3) to respectively move outwards along the radial direction of the tube blank so as to separate the movable die assemblies (4) from the metal tube blank (12) and facilitate the subsequent pressing of the movable die (2) on the forming die assemblies (9); then applying a fluid pressure load to form a unimodal shaped primary wave by single extrusion of the shaped die assembly (9);
regulating and maintaining the fluid pressure in the metal tube blank (12), driving the movable die (2) to move along the axial direction towards the fixed die (6) through a die driving device (11) on the movable die base plate (1), further enabling all dies of the forming die assembly (9) to contact each other, and forming waves by utilizing extrusion of all dies of the forming die assembly (9);
step five, unloading fluid pressure from a fluid loading and unloading port (14) of the fixed die seat plate (5), and then driving the movable die (2) to axially retract to an initial position far away from the fixed die (6) by using a die driving device (11); forming die plate assemblies (9) on the left side and the right side of the metal tube blank (12) are driven by a forming die plate driving device (8) to move outwards along the radial direction of the tube blank respectively; and taking out the formed metal corrugated pipe.
2. The metal bellows fluid pressure forming method according to claim 1, wherein: the movable die assembly (4) consists of two parts which are symmetrically arranged up and down and have the same structure, each part comprises a die connecting shaft (15), and a plurality of semicircular movable dies (16) are arranged on the die connecting shafts (15); and the middle part of the die-connecting shaft (15) is connected with the telescopic end of the movable die-driving device (3).
3. The metal bellows fluid pressure forming method according to claim 2, wherein: the semicircular movable die piece (16) is composed of a semicircular movable die piece main body (17), a mounting hole (18) is formed in the middle of one side of the circular arc edge of the movable die piece main body (17), a forming part I (19) is arranged in the middle of one side of the straight edge of the movable die piece main body (17), and guide post avoidance openings (20) are formed in two ends of the movable die piece main body (17) respectively.
4. The metal bellows fluid pressure forming method according to claim 2, wherein: the die connecting shaft (15) is composed of a connecting shaft main body (21), a plurality of die mounting parts (22) are arranged on the connecting shaft main body (21), and forming piece avoiding grooves (23) are formed in positions, between two adjacent die mounting parts (22), on the connecting shaft main body (21).
5. The metal bellows fluid pressure forming method according to claim 1, wherein: the forming die piece assembly (9) consists of two parts which are symmetrically arranged left and right and have the same structure, each part comprises a die guide post (13), and a plurality of semicircular forming die pieces (24) are arranged on the die guide post (13) in a sliding manner; the ends of the die guide posts (13) are connected to the telescoping end of the forming die drive (8).
6. The metal bellows fluid pressure forming method according to claim 5, wherein: the semicircular forming die sheet (24) is composed of a semicircular forming die sheet main body (25), a guide column jack (26) is arranged in the middle of one side of the circular arc edge of the forming die sheet main body (25), a forming part II (27) is arranged in the middle of one side of the straight edge of the forming die sheet main body (25), and connecting shaft avoidance openings (28) are respectively formed at two ends of the forming die sheet main body (25); the semicircular forming mold piece (24) is arranged on the compression mold guide post (13) in a sliding way through the guide post jack (26).
7. The metal bellows fluid pressure forming method according to claim 5, wherein: the side part of a forming part II (27) of the semicircular forming die sheet (24) is provided with a forming concave table (29).
8. The metal bellows fluid pressure forming method according to claim 1, wherein: and step two, after the bimodal primary wave is formed, removing all or part of the gaskets, applying a certain fluid pressure load and maintaining pressure, and then, driving the movable pressing die (2) to move for a certain distance along the axial direction by the pressing die driving device (11), and unloading to flatten the bimodal primary wave.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811330102.4A CN109277445B (en) | 2018-11-09 | 2018-11-09 | Fluid pressure forming device and method for metal corrugated pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811330102.4A CN109277445B (en) | 2018-11-09 | 2018-11-09 | Fluid pressure forming device and method for metal corrugated pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109277445A CN109277445A (en) | 2019-01-29 |
| CN109277445B true CN109277445B (en) | 2024-01-19 |
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| CN111496043B (en) * | 2020-04-14 | 2022-04-15 | 西安石油大学 | Combined hydraulic bulging die for manufacturing rectangular metal corrugated pipe |
| CN117358817B (en) * | 2023-12-07 | 2024-04-16 | 沈阳仪表科学研究院有限公司 | Plastic forming device and plastic forming method for metal corrugated pipe |
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