CN110523833B - One-way extension compensation Y-shaped corrugated pipe, forming device and forming method - Google Patents
One-way extension compensation Y-shaped corrugated pipe, forming device and forming method Download PDFInfo
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- CN110523833B CN110523833B CN201910650826.5A CN201910650826A CN110523833B CN 110523833 B CN110523833 B CN 110523833B CN 201910650826 A CN201910650826 A CN 201910650826A CN 110523833 B CN110523833 B CN 110523833B
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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
- B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
- B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
- B21D26/033—Deforming tubular bodies
- B21D26/045—Closing or sealing means
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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
- B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
- B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
- B21D26/033—Deforming tubular bodies
- B21D26/047—Mould construction
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L51/00—Expansion-compensation arrangements for pipe-lines
- F16L51/02—Expansion-compensation arrangements for pipe-lines making use of bellows or an expansible folded or corrugated tube
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- General Engineering & Computer Science (AREA)
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- Diaphragms And Bellows (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
The invention provides a one-way extension-compensated Y-shaped corrugated pipe, wherein the edge part of the corrugated pipe comprises a plurality of adjacent wave structures, each wave structure comprises a wave crest of the Y-shaped structure and a groove of a water drop-shaped structure, the wave crest of the Y-shaped structure comprises two U-shaped waves, and the two U-shaped waves form two branches of the Y-shaped structure. Meanwhile, the invention also provides a forming device and a forming method of the Y-shaped corrugated pipe with unidirectional extension compensation. The Y-shaped corrugated pipe has good axial extension compensation capability and higher axial bearing capability, can ensure that the corrugated pipe meets axial extension displacement compensation under a high-temperature condition, and prolongs the service life of the corrugated pipe. The method of the invention adopts a two-step forming process, thereby reducing the design and processing cost of the die and simultaneously improving the production efficiency of the corrugated pipe.
Description
Technical Field
The invention relates to a corrugated pipe forming method, in particular to a Y-shaped corrugated pipe with unidirectional extension compensation and a forming method.
Background
The corrugated pipe is a high-quality flexible pipeline in modern industrial pipelines, and has the characteristics of good flexibility, fatigue resistance, high pressure bearing capacity, good temperature resistance, corrosion resistance, strong sealing property and the like. The corrugated pipe is widely applied to industries such as petroleum, aviation, aerospace, chemical industry, electric power, transportation and the like, and the demand of the corrugated pipe with high quality and high performance is increasingly large along with the development of modern industries. The existing simple U-shaped, S-shaped and omega-shaped corrugated pipes have limited axial load bearing capacity, and under the working condition of high temperature, high pressure and high circulation, in a pipeline system only needing unidirectional extension compensation, higher requirements are provided for the unidirectional extension compensation capacity and the axial bearing capacity of the corrugated pipe. The existing telescopic compensation corrugated pipe cannot meet the requirements. Therefore, it is highly desirable to design and develop a unidirectional elongation compensating bellows with higher load capacity.
Disclosure of Invention
The invention aims to design a Y-shaped corrugated pipe with unidirectional extension compensation and a forming method. The large-waveform structure of the corrugated pipe is similar to a Y-shaped structure, one large-waveform structure comprises two small U-shaped waveforms opposite to each other in a back direction, and the cross section formed by surrounding adjacent Y-shaped waveforms is of a water drop type structure. The corrugated pipe is formed in a special mold under the action of a hydraulic wave expander.
Specifically, the invention provides a one-way elongation compensation Y-shaped corrugated pipe, the edge of the corrugated pipe comprises a plurality of adjacently arranged wave structures, each wave structure comprises a wave crest of the Y-shaped structure and a groove of a water drop-shaped structure, the wave crest of the Y-shaped structure comprises two U-shaped waves, and the two U-shaped waves form two branches of the Y-shaped structure.
Preferably, the length of the wave crest of the Y-shaped structure is 13mm, the height of the wave crest of the Y-shaped structure is 8mm, the wave form angle of the Y-shaped structure is 60 degrees, the radius of an arc between two U-shaped waves is 80mm, the fillet radius of the wave trough is 2mm, the fillet radius of the U-shaped waves is 2mm, and the fillet radius Rm between the two U-shaped waves is 1.5 mm.
Preferably, the invention also provides a one-way elongation compensation Y-shaped corrugated pipe forming device, which comprises an upper female die, a lower female die, an upper positioning die, a lower positioning die, a plurality of split male dies, a plurality of push rods and a plurality of connecting rods,
the multiple split convex dies comprise a first split convex die, a second split convex die, a third split convex die, a fourth split convex die, a fifth split convex die and a sixth split convex die, the multiple push rods comprise a first push rod, a second push rod, a third push rod, a fourth push rod, a fifth push rod, a sixth push rod, a seventh push rod and an eighth push rod, the first split convex die, the second split convex die, the third split convex die, the fourth split convex die, the fifth split convex die and the sixth split convex die are uniformly arranged around the circumferential direction of the corrugated pipe,
the first ends of the first push rod, the second push rod, the third push rod, the fourth push rod, the fifth push rod and the sixth push rod are respectively connected with respective threaded holes of a first split male die, a second split male die, a third split male die, a fourth split male die, a fifth split male die and a sixth split male die, the first end of the seventh push rod is in threaded connection with a horizontal threaded hole in the first side of the upper female die, the first end of the eighth push rod is in threaded connection with a horizontal threaded hole in the first side of the lower female die, and the second ends of the first push rod, the second push rod, the third push rod, the fourth push rod, the fifth push rod, the sixth push rod, the seventh push rod and the eighth push rod are all connected with a hydraulic cylinder;
the upper positioning die is arranged on the second side of the upper concave die, the upper concave die can be close to or far away from the upper positioning die, the lower positioning die is arranged on the second side of the lower concave die, and the lower concave die can be close to or far away from the lower positioning die.
Preferably, the upper female die is provided with a first half-omega-shaped circular groove with a downward opening, the upper positioning die is provided with a second half-omega-shaped circular groove with a downward opening, the first half-omega-shaped circular groove and the second half-omega-shaped circular groove can be combined into a complete omega-shaped circular groove with a downward opening,
the lower female die is provided with a third half-omega-shaped circular groove with an upward opening, the lower positioning die is provided with a fourth half-omega-shaped circular groove with an upward opening, the third half-omega-shaped circular groove and the fourth half-omega-shaped circular groove can be combined into a complete omega-shaped circular groove with an upward opening,
the bottom parts of the first split male die, the second split male die, the third split male die, the fourth split male die, the fifth split male die and the sixth split male die are all provided with a wave-shaped circular groove.
Preferably, the radius of the first half omega-shaped circular groove is stepped, the radius of one side, facing the seventh push rod, is smaller than the radius of the other side, the heights of the large radius and the small radius are both equal to half of the omega-shaped wave width of the corrugated pipe, the small radius of the first half omega-shaped circular groove is equal to the radius of a pipe blank of the corrugated pipe and the thickness of the first half omega-shaped circular groove is smaller than the distance between two omega-shaped waves, and the large radius of the first half omega-shaped circular groove is equal to the sum of the outer diameter of the pipe;
the radius of the second half omega-shaped circular groove is stepped, the radius of one side, facing the seventh push rod, of the second half omega-shaped circular groove is larger than that of the other side of the second half omega-shaped circular groove, the heights of a large radius and a small radius are both equal to half of the omega-shaped wave width of the corrugated pipe, the small radius of the second half omega-shaped circular groove is equal to the radius of a pipe blank of the corrugated pipe, the thickness of the second half omega-shaped circular groove is smaller than the distance between two omega-shaped waves, and the large radius of the second half omega-;
the radius of the third half omega-shaped circular groove is stepped, the radius of one side, facing the eighth push rod, of the third half omega-shaped circular groove is smaller than the radius of the other side of the third half omega-shaped circular groove, the heights of the large radius and the small radius are both equal to half of the omega-shaped wave width of the corrugated pipe, the small radius of the third half omega-shaped circular groove is equal to the radius of a pipe blank of the corrugated pipe, the thickness of the third half omega-shaped circular groove is smaller than the distance between two omega-shaped waves, and the large radius of the third half omega;
the radius of the fourth half omega-shaped circular groove is stepped, the radius of one side, facing the eighth push rod, of the fourth half omega-shaped circular groove is larger than the radius of the other side of the fourth half omega-shaped circular groove, the heights of a large radius and a small radius are both equal to half of the omega-shaped wave width of the corrugated pipe, the small radius of the fourth half omega-shaped circular groove is equal to the radius of a pipe blank of the corrugated pipe, the thickness of the fourth half omega-shaped circular groove is smaller than the distance between two omega-shaped waves, and the large radius of the fourth half omega;
preferably, the multiple split punches are identical in structure, the shape of the wave-shaped circular groove is matched with the outer waveform of the Y-shaped structure, the thickness of the split punch is equal to that of the Y-shaped structure, the small radius of the wave-shaped circular groove is equal to the sum of the radius of the tube blank and the height of the waveform structure minus the height of the branch of the Y-shaped structure, and the large radius of the wave-shaped circular groove is equal to the sum of the radius of the tube blank and the height of the waveform structure.
Preferably, a first sealing ring, a second sealing ring, a third sealing ring and a fourth sealing ring are arranged in the corrugated pipe, threaded holes are formed in the centers of the first sealing ring and the second sealing ring, threaded holes are formed in the upper portions, the lower portions and the centers of the third sealing ring and the fourth sealing ring respectively, the first sealing ring is in threaded connection with one end of the first oil unloading rod, the second sealing ring is in threaded connection with the third sealing ring through a first connecting rod, the third sealing ring is in threaded connection with the fourth sealing ring through a second connecting rod and a third connecting rod, and the fourth sealing ring is in threaded connection with one end of the second oil unloading rod.
Preferably, the fixed ends of the upper female die and the upper positioning die are fixed on an upper cross beam of the wave expanding machine, and the fixed ends of the lower female die and the lower positioning die are fixed on a lower cross beam of the wave expanding machine.
Preferably, the second sealing ring is in threaded connection with the third sealing ring through a first connecting rod, the third sealing ring is in threaded connection with the fourth sealing ring through a second connecting rod and a third connecting rod, and the fourth sealing ring is in threaded connection with one end of the second oil unloading rod.
Preferably, the present invention further provides a method for forming a unidirectional elongation-compensated Y-shaped corrugated pipe, comprising the steps of:
s1, fixing ends of the upper female die, the lower female die, the upper positioning die and the lower positioning die are respectively fixed on a wave expanding machine, and meanwhile, a plurality of split male dies are respectively fixed on piston rods of uniformly distributed hydraulic cylinders through corresponding push rods;
s2, placing four sealing rings in a corrugated pipe blank, pushing a first sealing ring to the position where the polished surface of the first sealing ring is on the same surface as the force application points of an upper female die and a lower female die by a first oil unloading rod, pushing a second sealing ring to the position where the polished surface of the second sealing ring is on the same surface as the force application points of an upper positioning die and a lower positioning die by a second oil unloading rod, and simultaneously enabling the polished surfaces of a third sealing ring and a fourth sealing ring to be respectively in the center positions of wave-shaped wave troughs;
s3, filling hydraulic oil into a space between the first sealing ring and the second sealing ring, wherein the first oil unloading rod is a hollow tube, the hydraulic oil is filled into the space between the first sealing ring and the second sealing ring from a tube opening of the first oil unloading rod, and the hydraulic oil pressurizes the inner wall of the corrugated tube blank to expand the corrugated tube blank so as to position the corrugated tube blank in a waveform manner;
s4, filling hydraulic oil into a space between the third sealing ring and the fourth sealing ring, wherein the hydraulic oil is filled into the space between the third sealing ring and the fourth sealing ring from a pipe orifice of the second oil unloading rod, and the hydraulic oil between the first sealing ring and the second sealing ring and between the third sealing ring and the fourth sealing ring keep certain pressure;
s5, the upper female die and the lower female die push the corrugated pipe blank to move towards a fixed second sealing ring under the combined action of a seventh push rod, an eighth push rod and a first oil unloading rod on the first sealing ring respectively until the waveform is formed, and meanwhile, the multiple split male dies respectively move towards the center direction of the pipe blank shaft under the action of the respective push rods until the split male dies are contacted with each other, and hydraulic oil is unloaded;
s6, the upper female die, the lower female die, the upper positioning die, the lower positioning die split male die and the sealing ring are all reset, the tube blank is pushed by the feeding device to be fed by the required step length, and the next ripple is formed.
Compared with the prior art, the invention has the following beneficial effects:
1. the Y-shaped corrugated pipe has good axial extension compensation capability and higher axial bearing capability, can ensure that the corrugated pipe meets axial extension displacement compensation under a high-temperature condition, and prolongs the service life of the corrugated pipe.
2. The method adopts a two-step forming process, can reduce the design and processing cost of the die, and simultaneously improves the production efficiency of the corrugated pipe.
Drawings
FIG. 1 is a schematic, diagrammatic front cross-sectional view of a Y-shaped bellows of the present invention;
FIG. 2 is a schematic, diagrammatic front cross-sectional view of a preliminary formed tube of the corrugated tubing of the present invention;
FIG. 3 is a schematic, simplified front cross-sectional view of a mold at the positioning stage of the forming process of the present invention;
FIG. 4 is a schematic, simplified sectional front view of a mold in the bulging stage of the forming process of the present invention;
FIG. 5 is a schematic, diagrammatic front cross-sectional view of the die during the bulge and hold-down stages of the forming process of the present invention;
FIG. 6 is a schematic, simplified left side elevational view in cross-section of the mold during the hold-down positioning stage of the forming process of the present invention; and
fig. 7 is a schematic, simplified left side cross-sectional view of a mold during the down-press forming stage of the forming process of the present invention.
Some of the reference numbers in the figures are as follows:
1-a seventh push rod, 2-an upper female die, 3-an upper positioning die, 4-a first split male die, 5-a first push rod, 6-a tube blank, 7-a fourth sealing ring, 11-a first connecting rod, 9-a third sealing ring, 10-a second oil discharging rod, 8-a second connecting rod, 12-a third connecting rod, 13-a second sealing ring, 14-a fourth push rod, 15-a fourth split male die, 16-a lower positioning die, 17-a lower female die, 18-an eighth push rod, 19-a first sealing ring, 20-a first oil discharging rod, 21-a second push rod, 22-a second split male die, 23-a third push rod, 24-a third split male die, 25-a fifth push rod, 26-a fifth split male die, 27-a sixth push rod, 28-a sixth split punch;
100-wave structure, 101-wave crest of Y-shaped structure, 102-groove of water drop-shaped structure, 103-U-shaped wave and 104-omega-shaped wave; 105-a first half omega-shaped circular groove, 106-a second half omega-shaped circular groove, 107-a third half omega-shaped circular groove and 108-a fourth half omega-shaped circular groove.
Detailed Description
Exemplary embodiments, features and aspects of the present invention will be described in detail below with reference to the accompanying drawings. In the drawings, like reference numbers can indicate functionally identical or similar elements. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.
The invention provides a Y-shaped corrugated pipe with unidirectional elongation compensation, as shown in fig. 1, the edge of the corrugated pipe comprises a plurality of adjacently arranged wave structures 100, each wave structure 100 comprises a wave crest 101 of the Y-shaped structure and a groove 102 of a water drop-shaped structure, the wave crest 101 of the Y-shaped structure comprises two U-shaped waves 103, and the two U-shaped waves 103 form two branches of the Y-shaped structure.
Preferably, the length of the peak 101 of the Y-shaped structure is 13mm, the height thereof is 8mm, the waveform angle thereof is 60 °, the radius of the arc between the two U-shaped waves 103 is 80mm, the fillet radius of the trough is 2mm, the fillet radius of the U-shaped wave structure is 2mm, and the fillet radius Rm between the two U-shaped waves 103 is 1.5 mm.
The method adopts a two-step forming process, can reduce the design and processing cost of the die, and simultaneously improves the production efficiency of the corrugated pipe. The first step is to form a corrugated tube having a plurality of omega-shaped waves 104 on the sides as shown in fig. 2, and then further form the corrugated tube to form a unidirectional expansion-compensated Y-shaped corrugated tube as shown in fig. 1.
Preferably, the invention also provides a one-way elongation compensation Y-shaped corrugated pipe forming device, which comprises an upper female die 2, a lower female die 17, an upper positioning die 3, a lower positioning die 16, a plurality of split male dies, a plurality of push rods and a plurality of connecting rods,
the plurality of split punches comprise a first split punch 4, a second split punch 22, a third split punch 24, a fourth split punch 15, a fifth split punch 26 and a sixth split punch 28, the plurality of push rods comprise a first push rod 5, a second push rod 21, a third push rod 23, a fourth push rod 14, a fifth push rod 25, a sixth push rod 27, a seventh push rod 1 and an eighth push rod 18, the first split punch 4, the second split punch 22, the third split punch 24, the fourth split punch 15, the fifth split punch 26 and the sixth split punch 28 are uniformly arranged around the circumference of the corrugated pipe,
first ends of a first push rod 5, a second push rod 21, a third push rod 23, a fourth push rod 14, a fifth push rod 25 and a sixth push rod 27 are respectively connected with respective threaded holes of a first split male die 4, a second split male die 22, a third split male die 24, a fourth split male die 15, a fifth split male die 26 and a sixth split male die 28, a first end of the seventh push rod 1 is in threaded connection with a horizontal threaded hole at a first side of an upper female die 2, a first end of an eighth push rod 18 is in threaded connection with a horizontal threaded hole at a first side of a lower female die 17, and second ends of the first push rod 5, the second push rod 21, the third push rod 23, the fourth push rod 14, the fifth push rod 25, the sixth push rod 27, the seventh push rod 1 and the eighth push rod 18 are all connected with a hydraulic cylinder;
preferably, the upper female die 2 is provided with a first half-omega-shaped circular groove 105 which is opened downwards, the upper positioning die 3 is provided with a second half-omega-shaped circular groove 106 which is opened downwards, the first half-omega-shaped circular groove 105 and the second half-omega-shaped circular groove 106 can be combined into a complete omega-shaped circular groove which is opened downwards,
the lower die 17 is provided with a third half-omega-shaped circular groove 107 with an upward opening, the lower positioning die 16 is provided with a fourth half-omega-shaped circular groove 108 with an upward opening, the third half-omega-shaped circular groove 107 and the fourth half-omega-shaped circular groove 108 can be combined into a complete omega-shaped circular groove with an upward opening,
the bottoms of the first split male die 4, the second split male die 22, the third split male die 24, the fourth split male die 15, the fifth split male die 26 and the sixth split male die 28 are all provided with a wave-shaped circular groove.
Preferably, the radius of the first half omega-shaped circular groove 105 is stepped, the radius of one side facing the seventh push rod 1 is smaller than that of the other side, and the heights of the large radius and the small radius are equal to the omega-shaped wave width W of the corrugated pipe2The small radius of the first half omega-shaped circular groove 105 is equal to the radius of the corrugated pipe blank and the thickness is less than the distance between two omega-shaped waves 104, the large radius of the first half omega-shaped circular groove 105 is equal to the outer diameter of the corrugated pipe blank and the height of the omega-shaped wavesH 1The sum of (1).
The radius of the second half omega-shaped circular groove 106 is in a step shape, the radius of one side facing the seventh push rod 1 is larger than that of the other side, and the heights of the large radius and the small radius are both equal to the omega-shaped wave width W of the corrugated pipe2The small radius of the second half omega-shaped circular groove 106 is equal to the radius of the corrugated pipe blank and the thickness is less than the distance between two omega-shaped waves 104, and the large radius of the second half omega-shaped circular groove 106 is equal to the outer diameter of the corrugated pipe blank and the height of the omega-shaped wavesH 1The sum of (1).
The radius of the third half omega-shaped circular groove 107 is in a step shape, the radius of one side facing the eighth push rod 18 is smaller than that of the other side, and the heights of the large radius and the small radius are equal to the omega-shaped wave width W of the corrugated pipe2The small radius of the third half omega-shaped circular groove 107 is equal to the radius of the corrugated pipe blank and the thickness is less than the distance between two omega-shaped waves 104, and the large radius of the third half omega-shaped circular groove 107 is equal to the outer diameter of the corrugated pipe blank and the height of the omega-shaped wavesH 1The sum of (1).
The radius of the fourth half-omega-shaped circular groove 108 is in a step shape, the radius of one side facing the eighth push rod 18 is larger than that of the other side, and the heights of the large radius and the small radius are equal to the omega-shaped wave width W of the corrugated pipe2The small radius of the fourth half omega-shaped circular groove 108 is equal to the radius of the corrugated pipe blank and the thickness is less than the distance between two omega-shaped waves 104, and the large radius of the fourth half omega-shaped circular groove 108 is equal to the outer diameter of the corrugated pipe blank and the height of the omega-shaped wavesH 1The sum of (1).
The split male dies have the same structure, the shape of the wave-shaped circular groove is matched with the outer waveform of the Y-shaped structure, the thickness of the split male die is equal to that of the Y-shaped structure, the small radius of the wave-shaped circular groove is equal to the sum of the radius of the tube blank and the height of the waveform structure 100 minus the height of a branch of the Y-shaped structure, and the large radius of the wave-shaped circular groove is equal to the sum of the radius of the tube blank and the height of the waveform structure 100.
Preferably, a first sealing ring 19, a second sealing ring 13, a third sealing ring 9 and a fourth sealing ring 7 are arranged inside the corrugated pipe, threaded holes are formed in the centers of the first sealing ring 19 and the second sealing ring 13, threaded holes are formed in the upper portions, the lower portions and the centers of the third sealing ring 9 and the fourth sealing ring 7 respectively, the first sealing ring 19 is in threaded connection with one end of the first oil unloading rod 20, the second sealing ring 13 is in threaded connection with the third sealing ring 9 through a first connecting rod 11, the third sealing ring 9 is in threaded connection with the fourth sealing ring 7 through a second connecting rod 8 and a third connecting rod 12, and the fourth sealing ring 7 is in threaded connection with one end of the second oil unloading rod 10.
Preferably, the fixed ends of the upper concave die 2 and the upper positioning die 3 are fixed on an upper beam of the wave expanding machine, and the fixed ends of the lower concave die 17 and the lower positioning die 16 are fixed on a lower beam of the wave expanding machine.
Preferably, the second sealing ring 13 is in threaded connection with the third sealing ring 9 through a first connecting rod 11, the third sealing ring 9 is in threaded connection with the fourth sealing ring 7 through a second connecting rod 8 and a third connecting rod 12, and the fourth sealing ring 7 is in threaded connection with one end of the second oil unloading rod 10.
Preferably, the present invention further provides a method for forming a unidirectional elongation-compensated Y-shaped corrugated pipe, comprising the steps of:
s1, fixing ends of the upper female die 2, the lower female die 17, the upper positioning die 3 and the lower positioning die 16 are respectively fixed on a wave expanding machine, and meanwhile, a plurality of split male dies are respectively fixed on piston rods of uniformly distributed hydraulic cylinders through corresponding push rods;
s2, placing four sealing rings in a corrugated pipe blank 6, pushing a first sealing ring 19 to the position where the smooth surface of the first sealing ring is on the same surface as the force application points of an upper female die 2 and a lower female die 17 by a first oil unloading rod 20, pushing a second sealing ring 13 to the position where the smooth surface of the second sealing ring is on the same surface as the force application points of an upper positioning die 3 and a lower positioning die 16 by a second oil unloading rod 10, and simultaneously enabling the smooth surfaces of a third sealing ring 9 and a fourth sealing ring 7 to be respectively in the central positions of wave-shaped wave troughs;
s3, firstly, filling hydraulic oil into a space between the first sealing ring 19 and the second sealing ring 13, wherein the first oil unloading rod 20 is a hollow pipe, the hydraulic oil is filled into the space between the first sealing ring 19 and the second sealing ring 13 from a pipe orifice of the first oil unloading rod 20, and the hydraulic oil pressurizes the inner wall of the corrugated pipe blank 6 to enable the inner wall to swell and is positioned in a waveform mode;
s4, filling hydraulic oil into a space between the third sealing ring 9 and the fourth sealing ring 7, wherein the hydraulic oil is filled into the space between the third sealing ring 9 and the fourth sealing ring 7 from the pipe orifice of the second oil discharging rod 10, and the hydraulic oil between the first sealing ring 19 and the second sealing ring 13 and between the third sealing ring 9 and the fourth sealing ring 7 keep certain pressure;
s5, the upper female die 2 and the lower female die 17 respectively push the corrugated pipe blank 6 to move towards the fixed second sealing ring 13 under the combined action of the seventh push rod 1, the eighth push rod 18 and the first oil unloading rod 20 on the first sealing ring 19 until the wave shape is formed, and at the moment, the wave shape shown in figure 2 is formed. Meanwhile, the multiple split male dies respectively move towards the center direction of the tube blank shaft under the action of respective push rods until the split male dies are contacted with each other, and hydraulic oil is unloaded;
s6, the upper female die 2, the lower female die 17, the upper positioning die 3, the lower positioning die split male die and the sealing ring are all reset, the tube blank 6 is pushed by the feeding device to be fed by the required step length, and the next ripple is formed.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
The fixed ends of the upper female die 2, the lower female die 17, the upper positioning die 3 and the lower positioning die 16 are respectively fixed on an upper beam and a lower beam of the wave expanding machine, meanwhile, the multiple split male dies are respectively fixed on piston rods of the uniformly distributed hydraulic cylinders through respective push rods, the dies from left to right are arranged in sequence, namely the upper female die, the lower female die, the upper positioning die, the lower positioning die and the multiple split male dies, and the upper female die, the lower female die, the upper positioning die and the lower positioning die tightly hoop the tube blank 6 from the outer side under the action of the upper beam and the lower beam of the wave expanding machine, as shown in figure 3.
Four sealing rings are arranged in a corrugated pipe blank, a first sealing ring 19 is pushed to the position where the smooth surface of the first sealing ring is positioned on the same surface as the force application points of an upper female die and a lower female die by a first oil unloading rod, in addition, a second sealing ring 13, a third sealing ring 9 and a fourth sealing ring 7 are fixedly connected through a first connecting rod 11, a second connecting rod 8 and a third connecting rod 12, and the second sealing ring is pushed to the position where the smooth surface of the second sealing ring 13 is positioned on the same surface as the force application points of an upper positioning die and a lower positioning die by a second oil unloading rod 10, and meanwhile, the smooth surfaces of the third sealing ring 9 and the fourth sealing ring 7 are respectively positioned at the central positions of omega-.
Firstly, filling hydraulic oil into a space between the first sealing ring 19 and the second sealing ring 13, wherein the first oil unloading rod is a hollow pipe, the hydraulic oil is filled into the space between the first sealing ring 19 and the second sealing ring 13 from a pipe orifice of the first oil unloading rod, and the hydraulic oil pressurizes the inner wall of the corrugated pipe blank to expand the corrugated pipe blank so as to position the corrugated pipe blank in a waveform mode.
Then, hydraulic oil is filled into a space between the third sealing ring 9 and the fourth sealing ring 7, the second oil discharging rod 10 is a hollow pipe, the hydraulic oil is filled into the space between the third sealing ring 9 and the fourth sealing ring 7 from a pipe orifice of the second oil discharging rod 10, and the hydraulic oil between the first sealing ring 19 and the second sealing ring 13 and between the third sealing ring 9 and the fourth sealing ring 7 keep certain pressure, as shown in fig. 4.
The upper female die and the lower female die push the corrugated pipe blank to move towards the fixed second sealing ring 13 under the combined action of the first oil unloading rods on the seventh push rod 1, the eighth push rod 18 and the first sealing ring 19 respectively until the waveform is formed, meanwhile, the multiple split male dies respectively move towards the center direction of the pipe blank shaft under the action of the respective push rods until the split male dies are contacted with each other, and hydraulic oil is unloaded, as shown in fig. 5.
The upper female die, the lower female die, the upper positioning die, the lower positioning die, the split male die and the sealing ring are all reset, and the tube blank 6 is pushed by the feeding device to be fed by the required step length to form the next ripple. Finally, a corrugated pipe with a Y-shaped wave structure is obtained, as shown in figure 1, the diameter D of the corrugated pipe is 80mm, and the wave heightH8mm, wavelength W13 mm, wave angleTheta =60 DEG, a trough spacing S =6mm, a trough fillet radius RtIs 2mm, and the radius R of the fillet of the wave crestcIs 2mm, and the radius R of the fillet between wave crestsm1.5mm, height of adjacent peakshThe axial load of the corrugated pipe is 320N, and the corrugated pipe can bear the axial load per unit displacement through experimental analysis. And the axial load which can be borne by the unit displacement of the corrugated pipe with the diameter D of 80mm, the wave height of 8mm, the wavelength of 9mm and the radius of the fillet of the wave crest of 3mm is 170N under the same boundary condition. Therefore, the corrugated pipe with the Y-shaped wave structure with the unidirectional elongation compensation can bear larger axial load, and meanwhile, the failure mode that the wave forms are subjected to plastic deformation is avoided.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solution of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (8)
1. A forming device for a Y-shaped corrugated pipe with unidirectional elongation compensation is characterized in that: the edge of the corrugated pipe comprises a plurality of adjacent wave structures, each wave structure comprises a wave crest of a Y-shaped structure and a groove of a water drop-shaped structure, the wave crest of the Y-shaped structure comprises two U-shaped waves, and the two U-shaped waves form two branches of the Y-shaped structure;
the length of the wave crest of the Y-shaped structure is 13mm, the height of the wave crest is 8mm, the waveform angle of the wave crest is 60 degrees, the radius of an arc between two U-shaped waves is 80mm, the fillet radius of a wave trough is 2mm, the fillet radius of a U-shaped wave is 2mm, and the fillet radius Rm between the two U-shaped waves is 1.5 mm;
the forming device of the Y-shaped corrugated pipe with unidirectional extension compensation comprises an upper female die, a lower female die, an upper positioning die, a lower positioning die, a plurality of split male dies, a plurality of push rods and a plurality of connecting rods,
the multiple split convex dies comprise a first split convex die, a second split convex die, a third split convex die, a fourth split convex die, a fifth split convex die and a sixth split convex die, the multiple push rods comprise a first push rod, a second push rod, a third push rod, a fourth push rod, a fifth push rod, a sixth push rod, a seventh push rod and an eighth push rod, the first split convex die, the second split convex die, the third split convex die, the fourth split convex die, the fifth split convex die and the sixth split convex die are uniformly arranged around the circumferential direction of the corrugated pipe,
the first ends of the first push rod, the second push rod, the third push rod, the fourth push rod, the fifth push rod and the sixth push rod are respectively connected with respective threaded holes of a first split male die, a second split male die, a third split male die, a fourth split male die, a fifth split male die and a sixth split male die, the first end of the seventh push rod is in threaded connection with a horizontal threaded hole in the first side of the upper female die, the first end of the eighth push rod is in threaded connection with a horizontal threaded hole in the first side of the lower female die, and the second ends of the first push rod, the second push rod, the third push rod, the fourth push rod, the fifth push rod, the sixth push rod, the seventh push rod and the eighth push rod are all connected with a hydraulic cylinder;
the upper positioning die is arranged on the second side of the upper female die, the upper female die can be close to or far away from the upper positioning die, the lower positioning die is arranged on the second side of the lower female die, and the lower female die can be close to or far away from the lower positioning die;
the Y-shaped corrugated pipe has good axial elongation compensation capacity and high axial bearing capacity.
2. The apparatus for forming a unidirectional elongation compensated Y-shaped corrugated tubing of claim 1, wherein: the upper female die is provided with a first half omega-shaped circular groove with a downward opening, the upper positioning die is provided with a second half omega-shaped circular groove with a downward opening, the first half omega-shaped circular groove and the second half omega-shaped circular groove can be combined into a complete omega-shaped circular groove with a downward opening,
the lower female die is provided with a third half-omega-shaped circular groove with an upward opening, the lower positioning die is provided with a fourth half-omega-shaped circular groove with an upward opening, the third half-omega-shaped circular groove and the fourth half-omega-shaped circular groove can be combined into a complete omega-shaped circular groove with an upward opening,
the bottom parts of the first split male die, the second split male die, the third split male die, the fourth split male die, the fifth split male die and the sixth split male die are all provided with a wave-shaped circular groove.
3. The apparatus for forming a unidirectional elongation compensated Y-shaped corrugated tubing of claim 2, wherein: the radius of the first half omega-shaped circular groove is stepped, the radius of one side, facing the seventh push rod, of the first half omega-shaped circular groove is smaller than the radius of the other side of the first half omega-shaped circular groove, the heights of the large radius and the small radius are both equal to half of the omega-shaped wave width of the corrugated pipe, the small radius of the first half omega-shaped circular groove is equal to the radius of a pipe blank of the corrugated pipe, the thickness of the first half omega-shaped circular groove is smaller than the distance between two omega-shaped waves, and the large radius of the;
the radius of the second half omega-shaped circular groove is stepped, the radius of one side, facing the seventh push rod, of the second half omega-shaped circular groove is larger than that of the other side of the second half omega-shaped circular groove, the heights of a large radius and a small radius are both equal to half of the omega-shaped wave width of the corrugated pipe, the small radius of the second half omega-shaped circular groove is equal to the radius of a pipe blank of the corrugated pipe, the thickness of the second half omega-shaped circular groove is smaller than the distance between two omega-shaped waves, and the large radius of the second half omega-;
the radius of the third half omega-shaped circular groove is stepped, the radius of one side, facing the eighth push rod, of the third half omega-shaped circular groove is smaller than the radius of the other side of the third half omega-shaped circular groove, the heights of the large radius and the small radius are both equal to half of the omega-shaped wave width of the corrugated pipe, the small radius of the third half omega-shaped circular groove is equal to the radius of a pipe blank of the corrugated pipe, the thickness of the third half omega-shaped circular groove is smaller than the distance between two omega-shaped waves, and the large radius of the third half omega;
the radius of the fourth half omega-shaped circular groove is in a step shape, the radius of one side of the fourth half omega-shaped circular groove facing the eighth push rod is larger than the radius of the other side of the fourth half omega-shaped circular groove, the large radius and the small radius are both equal to half of the omega-shaped wave width of the corrugated pipe, the small radius of the fourth half omega-shaped circular groove is equal to the radius of the pipe blank of the corrugated pipe, the thickness of the fourth half omega-shaped circular groove is smaller than the distance between two omega-shaped waves, and the large radius of the fourth half omega-shaped.
4. The apparatus for forming a unidirectional elongation compensated Y-shaped corrugated tubing of claim 2, wherein: the split male dies are identical in structure, the shape of the wave-shaped circular groove is matched with the outer side wave form of the Y-shaped structure, the thickness of the split male die is equal to that of the Y-shaped structure, the small radius of the wave-shaped circular groove is equal to the sum of the radius of the tube blank and the height of the wave-shaped structure minus the height of a branch of the Y-shaped structure, and the large radius of the wave-shaped circular groove is equal to the sum of the radius of the tube blank and the height of the wave-shaped structure.
5. The apparatus for forming a unidirectional elongation compensated Y-shaped corrugated tubing of claim 1, wherein: the corrugated pipe is internally provided with a first sealing ring, a second sealing ring, a third sealing ring and a fourth sealing ring, the centers of the first sealing ring and the second sealing ring are provided with threaded holes, the upper parts, the lower parts and the centers of the third sealing ring and the fourth sealing ring are respectively provided with threaded holes, the first sealing ring is in threaded connection with one end of a first oil unloading rod, the second sealing ring is in threaded connection with the third sealing ring through a first connecting rod, the third sealing ring and the fourth sealing ring are in threaded connection with a second connecting rod, and the fourth sealing ring is in threaded connection with one end of a second oil unloading rod.
6. The apparatus for forming a unidirectional elongation compensated Y-shaped corrugated tubing of claim 1, wherein: the fixed ends of the upper female die and the upper positioning die are fixed on an upper cross beam of the wave expanding machine, and the fixed ends of the lower female die and the lower positioning die are fixed on a lower cross beam of the wave expanding machine.
7. A forming device for a Y-shaped corrugated pipe with unidirectional elongation compensation as claimed in claim 5, wherein: the second sealing ring is in threaded connection with the third sealing ring through the first connecting rod, the third sealing ring is in threaded connection with the fourth sealing ring through the second connecting rod and the third connecting rod, and the fourth sealing ring is in threaded connection with one end of the second oil unloading rod.
8. A method for forming a Y-shaped corrugated pipe with unidirectional extension compensation is characterized by comprising the following steps: which comprises the following steps:
s1, fixing ends of the upper female die, the lower female die, the upper positioning die and the lower positioning die are respectively fixed on a wave expanding machine, and meanwhile, a plurality of split male dies are respectively fixed on piston rods of uniformly distributed hydraulic cylinders through corresponding push rods;
s2, placing four sealing rings in a corrugated pipe blank, pushing a first sealing ring to the position where the polished surface of the first sealing ring is on the same surface as the force application points of an upper female die and a lower female die by a first oil unloading rod, pushing a second sealing ring to the position where the polished surface of the second sealing ring is on the same surface as the force application points of an upper positioning die and a lower positioning die by a second oil unloading rod, and simultaneously enabling the polished surfaces of a third sealing ring and a fourth sealing ring to be respectively in the center positions of wave-shaped wave troughs;
s3, filling hydraulic oil into a space between the first sealing ring and the second sealing ring, wherein the first oil unloading rod is a hollow tube, the hydraulic oil is filled into the space between the first sealing ring and the second sealing ring from a tube opening of the first oil unloading rod, and the hydraulic oil pressurizes the inner wall of the corrugated tube blank to expand the corrugated tube blank so as to position the corrugated tube blank in a waveform manner;
s4, filling hydraulic oil into a space between the third sealing ring and the fourth sealing ring, wherein the hydraulic oil is filled into the space between the third sealing ring and the fourth sealing ring from a pipe orifice of the second oil unloading rod, and the hydraulic oil between the first sealing ring and the second sealing ring and between the third sealing ring and the fourth sealing ring keep certain pressure;
s5, the upper female die and the lower female die push the corrugated pipe blank to move towards a fixed second sealing ring under the combined action of a seventh push rod, an eighth push rod and a first oil unloading rod on the first sealing ring respectively until the waveform is formed, and meanwhile, the multiple split male dies respectively move towards the center direction of the pipe blank shaft under the action of the respective push rods until the split male dies are contacted with each other, and hydraulic oil is unloaded;
s6, the upper female die, the lower female die, the upper positioning die, the lower positioning die split male die and the sealing ring are all reset, the tube blank is pushed by the feeding device to be fed by the required step length, and the next ripple is formed.
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| CN111390005B (en) * | 2020-03-24 | 2021-01-29 | 燕山大学 | Thin-wall straight pipe strengthening device and strengthening method |
| CN111922173A (en) * | 2020-09-29 | 2020-11-13 | 浙大宁波理工学院 | Multi-stage omega-shaped pipe fluctuation internal high-pressure forming process |
| CN112474951B (en) * | 2020-12-29 | 2022-07-29 | 湖北三江航天红阳机电有限公司 | Method for forming petal-shaped corrugated pipe |
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