CN115178638A - Auxiliary heating extrusion forming device and process for prefabricated three-way joint - Google Patents
Auxiliary heating extrusion forming device and process for prefabricated three-way joint Download PDFInfo
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- CN115178638A CN115178638A CN202210545171.7A CN202210545171A CN115178638A CN 115178638 A CN115178638 A CN 115178638A CN 202210545171 A CN202210545171 A CN 202210545171A CN 115178638 A CN115178638 A CN 115178638A
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- auxiliary heating
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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
- B21D26/037—Forming branched tubes
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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
- B21D26/039—Means for controlling the clamping or opening of the moulds
-
- 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
-
- 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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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
The invention relates to an auxiliary heating extrusion forming device and process for a prefabricated three-way joint, and the auxiliary heating extrusion forming device and process for the prefabricated three-way joint comprise a device body; the upper template is arranged on the top of the device body; the lower template is installed at the bottom of the device body, and the upper template and the lower template are pressed together to form an extrusion cavity; and the sealing part is used for sealing the connection part of the driving part and the cavity. The liquid storage part is arranged for storing the forming liquid, when the three-way pipe is formed, the driving part drives the telescopic rod to move, the telescopic rod pulls the extrusion plate on one side to move to one side, the forming liquid in the liquid storage tank is compressed to the other side from one side of the liquid storage tank and is extruded into the connecting pipe, so that energy consumption required by extrusion forming liquid can be saved, meanwhile, the forming liquid is compressed into the cavity more quickly, and the quality of pipe fittings is improved.
Description
Technical Field
The invention relates to the technical field of extrusion forming, in particular to an auxiliary heating extrusion forming device and process for a prefabricated three-way joint.
Background
The three-way pipe is a pipe fitting commonly used in industrial production, the traditional manufacturing process of the three-way pipe mainly comprises forging, casting and welding, the three traditional processes have defects of different degrees, the three-way pipe is manufactured mainly by adopting an extrusion process at present, a special hydraulic machine is mainly utilized, liquid is injected into a pipe blank with the diameter equal to that of the three-way pipe, the pipe blank is extruded by synchronous centering motion of two horizontal side cylinders of the hydraulic machine, the volume of the pipe blank is reduced after the pipe blank is extruded, the pressure of the liquid in the pipe blank is increased along with the reduction of the volume of the pipe blank, and when the pressure required by the expansion of the three-way branch pipe is reached, metal materials flow along the inner cavity of a die under the double effects of the liquid pressure in the side cylinders and the pipe blank to expand the branch pipe.
At present, the three-way pipe is manufactured by an extrusion forming process, wherein the sealing between two end parts of an extrusion cavity and a forming end socket is not tight, so that the leakage of forming liquid is easily caused, and the forming liquid cannot enter the cavity more quickly, so that the quality of the pipe fitting is reduced.
Disclosure of Invention
The invention aims to provide an auxiliary heating extrusion forming device and process for a prefabricated three-way joint.
In order to solve the technical problem, the invention provides an auxiliary heating extrusion forming device and process for a prefabricated three-way joint, which comprises a device body; the upper template is arranged at the top of the device body; the lower template is installed at the bottom of the device body, and the upper template and the lower template are pressed together to form an extrusion cavity; the driving part is used for blocking two ends of the cavity; the sealing part is used for sealing the connection part of the driving part and the cavity; the liquid storage part comprises liquid storage tanks fixed on two sides of the bottom of the device body, telescopic rods arranged inside the liquid storage tanks and connecting pipes arranged between the liquid storage tanks and the driving part, the connecting pipes are hoses, and the telescopic rods are connected with the driving part; wherein the driving part is suitable for driving the telescopic rod to extrude the materials in the liquid storage tank.
Furthermore, one side of the interior of the liquid storage box is fixedly provided with two groups of first springs, one side of each first spring is fixedly provided with an extrusion plate, the end part of the telescopic rod is fixed on the extrusion plate, and the extrusion plate is suitable for pushing materials into the connecting pipe.
Further, a mounting groove has been seted up to one side of diapire in the liquid reserve tank, the first cylinder of internally mounted of mounting groove, the push pedal is installed at the top of first cylinder, wherein works as the stripper plate removes to contradicting during the push pedal, the drive first cylinder is so that the push pedal pushes the material once more the connecting pipe.
Further, a support table is arranged on one side of the liquid storage tank; the driving part comprises two groups of second cylinders and a forming end socket arranged at the telescopic end of each second cylinder, fixed blocks are arranged at the top and the bottom of the forming end socket, and a telescopic rod is fixed at one side of each fixed block;
the second cylinder pushes the forming seal head to move rightwards, so that the extrusion plate extrudes the materials in the liquid storage tank to one side.
Furthermore, the sealing part comprises an oil storage cavity arranged in the support table, a second spring is mounted at one end of the oil storage cavity, an oil guide rod is fixed at one end of the second spring, and the other end of the oil guide rod is fixed in the forming end socket; the inside of leading the beam hanger is hollow setting, the oil inlet has been seted up to the one end of leading the beam hanger.
Further, a liner tube is arranged in the cavity, and the forming seal heads are suitable for abutting against two ends of the liner tube; the oil-out has been seted up to the lateral wall of shaping head, and the annular has been seted up to the inside wall of die cavity.
Furthermore, a branch pipe cavity is arranged at the bottom of the lower template, and a material supporting head is arranged in the branch pipe cavity; the two sides of the upper template are provided with stop blocks, and one side of the fixed block is hinged with a stop lever.
Furthermore, a third cylinder is installed at the top of the upper template.
The invention also provides a process of the auxiliary heating extrusion forming device for the prefabricated three-way joint, which comprises the following steps:
s1: placing the liner tube in the cavity, and starting a third air cylinder to compress the upper template to the lower template;
s2: starting a second air cylinder, pushing the forming seal head to move towards the inside of the cavity, driving the extrusion plate to extrude the forming liquid in the liquid storage tank into the discharge pipe by the telescopic rod, discharging the forming liquid from the pipe orifice, extruding the rest forming liquid to one side in the liquid storage tank, starting the first air cylinder, and lifting the first air cylinder to extrude the forming liquid at the top to the liner pipe again;
s3: when the forming seal head moves towards the end part of the liner tube, the oil guide rod extrudes the sealing oil in the oil storage cavity to one side, and the sealing oil enters the annular groove through the oil outlet;
s4: and after the extrusion is finished, lifting the upper template and withdrawing the forming end socket.
The auxiliary heating extrusion forming device and the auxiliary heating extrusion forming process for the prefabricated three-way joint have the advantages that the liquid storage part can be used for storing forming liquid, when the three-way pipe is formed, the driving part drives the telescopic rod to move, the telescopic rod pulls the extrusion plate on one side to move towards one side, the forming liquid in the liquid storage tank is compressed to the other side from one side of the liquid storage tank and is extruded into the connecting pipe, energy consumption required by the extrusion forming liquid can be saved, meanwhile, the forming liquid is compressed into the cavity more quickly, and pipe fitting quality is improved.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a perspective view of a preferred embodiment of the present invention;
FIG. 2 is a schematic front sectional view of the preferred embodiment of the present invention;
fig. 3 is a schematic view of the present invention at a part enlarged in fig. 2.
In the figure:
1. a device body;
2. mounting a template; 21. a stopper; 22. a gear lever; 23. a third cylinder;
3. a lower template; 31. a cavity; 32. a liner tube; 33. a branch lumen; 34. supporting a material head;
4. a drive section; 41. a support table; 42. a second cylinder; 43. forming an end enclosure; 44. a fixed block; 45. an oil outlet; 46. a discharge pipe;
5. a sealing part; 51. an oil storage chamber; 52. a second spring; 53. an oil guide rod; 54. an oil inlet;
6. a liquid storage part; 61. a liquid storage tank; 62. a telescopic rod; 63. a connecting pipe; 64. a first spring; 65. a compression plate; 66. mounting grooves; 67. a first cylinder; 68. a push plate.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams each illustrating the basic structure of the present invention only in a schematic manner, and thus show only the constitution related to the present invention.
As shown in fig. 1-3, the auxiliary heating extrusion molding device for the prefabricated tee joint of the present invention comprises a device body 1; the upper template 2 is installed at the top of the device body 1; a third cylinder 23 is arranged at the top of the upper template; the lower template 3 is installed at the bottom of the device body 1, and the upper template 2 and the lower template 3 are pressed together to form an extrusion cavity 31; by starting the third air cylinder 23, the upper template 2 is moved to the top of the lower template 3, and is pressed together with the lower template 3 to form an extrusion cavity 31, and the liner tube 32 is placed in the cavity 31 between the lower template 3 and the upper template.
The liquid storage part 6 comprises liquid storage tanks 61 fixed at two sides of the bottom of the device body 1, telescopic rods 62 arranged in the liquid storage tanks 61, and connecting pipes 63 arranged between the liquid storage tanks 61 and the driving part 4, wherein the connecting pipes 63 are hoses, and the telescopic rods 62 are connected with the driving part 4; the driving portion 4 is suitable for driving the telescopic rod 62 to extrude the material in the liquid storage box 61, two sets of first springs 64 are fixed on one side of the interior of the liquid storage box 61, the first springs 64 can be used for resetting the extrusion plate 65, the extrusion plate 65 is fixed on one side of the first springs 64, the end portion of the telescopic rod 62 is fixed on the extrusion plate 65, and the extrusion plate 65 is suitable for pushing the material into the connecting pipe 63.
Can be used to save the shaping liquid through setting up stock solution portion 6, when carrying out the shaping to the three-way pipe, drive portion 4 drives telescopic link 62 and removes, the stripper plate 65 of telescopic link 62 pulling one side removes to one side, the shaping liquid that will be located in the stock solution tank 61 compresses to the opposite side from one side of stock solution tank 61, and the extrusion enters into connecting pipe 63, make the energy consumption that can save extrusion shaping liquid needs, compress the shaping liquid to the die cavity 31 more fast simultaneously, improve the pipe fitting quality.
The driving part 4 is used for blocking two ends of the cavity 31; mounting groove 66 has been seted up to one side of diapire in the liquid reserve tank 61, the first cylinder 67 of the internally mounted of mounting groove 66, push pedal 68 is installed at the top of first cylinder 67, wherein works as stripper plate 65 moves to conflicting push pedal 68 is when, the drive first cylinder 67 so that push pedal 68 pushes the material once more connecting pipe 63.
Through the first cylinder 67 of installation in the inside of mounting groove 66, after the stripper plate 65 extrudees a part of shaping liquid to the inside of liquid reserve tank 61, still need to pour into a part of shaping liquid in the die cavity 31 inside, through starting first cylinder 67, first cylinder 67 rises and extrudes the shaping liquid in top again to connecting pipe 63.
A support table 41 is arranged on one side of the liquid storage tank 61; the driving part 4 comprises two groups of second air cylinders 42 and forming seal heads 43 arranged at the telescopic ends of the second air cylinders 42, fixed blocks 44 are arranged at the top and the bottom of the forming seal heads 43, and telescopic rods 62 are fixed on one sides of the fixed blocks 44; a discharge pipe 46 is arranged inside the forming end socket 43; the second air cylinder 42 pushes the forming head 43 to move rightwards, so that the material in the liquid storage tank 61 is extruded to one side by the extrusion plate 65 and is discharged through the discharge pipe 46.
Through the tip installation shaping head 43 at second cylinder 42, shaping head 43 can be used to seal the inside bushing pipe 32 tip of die cavity 31, fixed block 44 is used for fixed telescopic link 62, when second cylinder 42 promoted shaping head 43 and moves to die cavity 31 is inside, electric telescopic link 62 removes, telescopic link 62 can drive stripper plate 65 with the inside shaping liquid extrusion of liquid reserve tank 61 to discharging pipe 46, and discharge, and extrude remaining shaping liquid to one side in the liquid reserve tank 61, make can save the energy of consuming in the shaping liquid suction 32.
The sealing part 5 is used for sealing the connection part of the driving part 4 and the cavity 31; the sealing part 5 comprises an oil storage cavity 51 arranged inside the supporting platform 41, one end of the oil storage cavity 51 is provided with a second spring 52, one end of the second spring 52 is fixed with an oil guide rod 53, and the other end of the oil guide rod 53 is fixed in the forming end enclosure 43; the inside of the oil guide rod 53 is hollow, one end of the oil guide rod 53 is provided with an oil inlet 54, the inside of the cavity 31 is provided with the liner tube 32, and the forming end socket 43 is suitable for abutting against two ends of the liner tube 32; an oil outlet 45 is formed in the outer side wall of the forming seal head 43, and a ring groove is formed in the inner side wall of the cavity 31.
Make through setting up sealing portion 5 and seal up 32 tip of bushing pipe, prevent that the shaping liquid of injection from leaking outward, with filling sealing oil in the oil storage chamber 51, when shaping head 43 removes to bushing pipe 32 tip, lead the one end that oil pole 53 is located oil storage chamber 51 and extrude the inside sealing oil of oil storage chamber 51 to one side, sealing oil impresses the inside of leading oil pipe through oil inlet 54, and get into the annular through oil-out 45, further seal up the bushing pipe 32 tip, prevent that sealing oil from flowing out die cavity 31, avoid the shaping liquid to reveal.
A branch pipe cavity 33 is formed in the bottom of the lower template 3, and a material supporting head 34 is installed inside the branch pipe cavity 33; the both sides of cope match-plate pattern are provided with dog 21, one side of fixed block 44 articulates there is shelves pole 22, and through setting up fixed block 44, after lower template 3 and cope match-plate pattern laminating, through rotating when the pole, when the pole is located cope match-plate pattern 3 one side for can prevent that cope match-plate pattern 3 from removing.
When the extrusion force of the cavity 31 reaches the pressure required by the expansion of the branch pipe of the three-way pipe, the liner pipe 32 flows into the branch pipe cavity 33 of the lower template 3 to form the branch pipe, and the extrusion forming is completed.
The invention also provides a process of the auxiliary heating extrusion forming device for the prefabricated three-way joint, which comprises the following steps:
s1: placing the liner tube 32 in the cavity 31, and starting the third air cylinder 23 to compress the upper template onto the lower template 3;
s2: the second air cylinder 42 is started, the second air cylinder 42 pushes the forming end socket 43 to move towards the inside of the cavity 31, the telescopic rod 62 can drive the extrusion plate 65 to extrude the forming liquid in the liquid storage tank 61 into the discharge pipe 46 and discharge the forming liquid from the pipe opening, the rest forming liquid is extruded to one side in the liquid storage tank 61, then the first air cylinder 67 is started, and the first air cylinder 67 rises to extrude the forming liquid at the top to the liner pipe 32 again;
s3: when the forming seal head 43 moves towards the end part of the liner tube 32, the oil guide rod 53 extrudes the sealing oil in the oil storage cavity 51 to one side, and the sealing oil enters the annular groove through the oil outlet 45;
s4: after the extrusion is completed, the upper die plate is lifted and the forming end socket 43 is withdrawn.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (9)
1. An auxiliary heating extrusion forming device for a prefabricated three-way joint is characterized by comprising
A device body (1);
the upper template (2), the upper template (2) is installed on the top of the device body (1);
the lower template (3) is installed at the bottom of the device body (1), and the upper template (2) and the lower template (3) are pressed together to form an extrusion cavity (31);
the driving part (4), the said driving part (4) is used for stopping up the both ends of the die cavity (31);
the sealing part (5), the sealing part (5) is used for sealing the connection part of the driving part (4) and the cavity (31);
the liquid storage part (6) comprises liquid storage tanks (61) fixed on two sides of the bottom of the device body (1), telescopic rods (62) installed inside the liquid storage tanks (61), and connecting pipes (63) installed between the liquid storage tanks (61) and the driving part (4), the connecting pipes (63) are hoses, and the telescopic rods (62) are connected with the driving part (4);
wherein the driving part (4) is suitable for driving the telescopic rod (62) to extrude the materials in the liquid storage tank (61).
2. The auxiliary heating extrusion molding apparatus of a prefabricated tee joint as set forth in claim 1,
inside one side of liquid reserve tank (61) is fixed with two sets of first springs (64), one side of first spring (64) is fixed with stripper plate (65), telescopic link (62) end fixing on stripper plate (65), stripper plate (65) are suitable for to push the material into connecting pipe (63).
3. An auxiliary heating extrusion molding apparatus for a prefabricated three-way joint according to claim 2,
a mounting groove (66) is formed in one side of the inner bottom wall of the liquid storage box (61), a first air cylinder (67) is mounted inside the mounting groove (66), a push plate (68) is mounted at the top of the first air cylinder (67),
wherein when the pressing plate (65) moves to abut against the push plate (68), the first cylinder (67) is driven to cause the push plate (68) to push the material into the connecting pipe (63) again.
4. The auxiliary heating extrusion molding apparatus of a prefabricated tee joint as set forth in claim 3,
a support table (41) is arranged on one side of the liquid storage tank (61);
the driving part (4) comprises two groups of second air cylinders (42) and forming seal heads (43) arranged at the telescopic ends of the second air cylinders (42), fixed blocks (44) are arranged at the top and the bottom of the forming seal heads (43), and telescopic rods (62) are fixed on one sides of the fixed blocks (44);
the second air cylinder (42) pushes the forming seal head (43) to move rightwards, so that the extrusion plate (65) extrudes the material in the liquid storage tank (61) to one side.
5. The auxiliary heating extrusion molding apparatus of a prefabricated tee joint as set forth in claim 4,
the sealing part (5) comprises an oil storage cavity (51) arranged in the supporting platform (41), one end of the oil storage cavity (51) is provided with a second spring (52), one end of the second spring (52) is fixed with an oil guide rod (53), and the other end of the oil guide rod (53) is fixed in the forming end socket (43);
the inside of the oil guide rod (53) is arranged in a hollow mode, and an oil inlet (54) is formed in one end of the oil guide rod (53).
6. The auxiliary heating extrusion molding apparatus of a prefabricated tee joint as set forth in claim 5,
a liner tube (32) is arranged in the cavity (31), and the forming seal heads (43) are suitable for abutting against two ends of the liner tube (32);
an oil outlet is formed in the outer side wall of the forming end socket (43), and a ring groove is formed in the inner side wall of the cavity (31).
7. The auxiliary heating extrusion molding apparatus of a prefabricated tee joint as set forth in claim 6,
a branch pipe cavity (33) is formed in the bottom of the lower template (3), and a material supporting head (34) is installed inside the branch pipe cavity (33);
fixed blocks (44) are arranged on two sides of the upper template (2), and a blocking rod (22) is hinged to one side of each fixed block (44).
8. The auxiliary heating extrusion molding apparatus of a prefabricated tee joint as set forth in claim 7,
and a third cylinder (23) is installed at the top of the upper template (2).
9. A process for auxiliary heating extrusion molding apparatus of a prefabricated tee joint as set forth in any one of claims 1 to 8, comprising the steps of:
s1: placing the liner tube (32) in the cavity (31), and starting a third air cylinder (23) to compress the upper template (2) onto the lower template (3);
s2: starting a second air cylinder (42), wherein the second air cylinder (42) pushes a forming seal head (43) to move towards the inside of the cavity (31), a telescopic rod (62) can drive an extrusion plate (65) to extrude forming liquid in a liquid storage tank (61) into a discharge pipe and discharge the forming liquid from a pipe opening, the rest forming liquid is extruded to one side in the liquid storage tank (61), then a first air cylinder (67) is started, and the first air cylinder (67) rises to extrude the forming liquid at the top to a liner pipe (32) again;
s3: when the forming seal head (43) moves towards the end part of the liner tube (32), the oil guide rod (53) extrudes the sealing oil in the oil storage cavity (51) to one side, and the sealing oil enters the annular groove through the oil outlet;
s4: after extrusion is finished, the upper template (2) is lifted, and the forming end enclosure (43) is withdrawn.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210545171.7A CN115178638A (en) | 2022-05-19 | 2022-05-19 | Auxiliary heating extrusion forming device and process for prefabricated three-way joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210545171.7A CN115178638A (en) | 2022-05-19 | 2022-05-19 | Auxiliary heating extrusion forming device and process for prefabricated three-way joint |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115178638A true CN115178638A (en) | 2022-10-14 |
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ID=83513436
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210545171.7A Pending CN115178638A (en) | 2022-05-19 | 2022-05-19 | Auxiliary heating extrusion forming device and process for prefabricated three-way joint |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115178638A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115608839A (en) * | 2022-12-19 | 2023-01-17 | 沧州沧兴管道制造有限公司 | Pipe fitting gas expansion thermal forming equipment and process |
-
2022
- 2022-05-19 CN CN202210545171.7A patent/CN115178638A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115608839A (en) * | 2022-12-19 | 2023-01-17 | 沧州沧兴管道制造有限公司 | Pipe fitting gas expansion thermal forming equipment and process |
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