Forming device and method for large-size section internal spiral rib metal pipe

Abstract

The invention discloses a forming device and method for a large-size section internal spiral rib metal pipe. The device comprises a mounting table, and a first fixing block and a second fixing block are arranged at the two ends of the top of the mounting table correspondingly; the first fixing block is slidably connected with the mounting table, and the second fixing block is fixedly connected with the mounting table; a mounting frame is arranged on the side, close to the second fixing block, of the first fixing block, one end of a rotating rod is connected to the side, close to the first fixing block, of the second fixing block, and a core rod with a spiral groove and a round rod are sequentially arranged at the other end of the rotating rod. A plurality of rollers arranged in a planetary mode are arranged on the outer surface of the round rod. According to the forming device and method for the large-size section internal spiral rib metal pipe, metal pipe blanks of different sizes can be installed for the forming process, the metal pipe blanks do not need to be heated before forming, energy waste is effectively reduced, the production cost is reduced, and the forming efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of metal forming, and in particular relates to a forming device and method for a metal tube with large-size cross-section and internal spiral ribs. Background Art

[0002] With the increasing demand for oil and natural gas, the transmission pressure and diameter of pipelines are also increasing. In order to improve the transmission efficiency and ensure the stability and safety of pipelines, it is necessary to increase the diameter and improve the strength of pipes to achieve the purpose of improving transmission efficiency and safety. Therefore, ultra-high pressure, ultra-large diameter, high-strength pipelines have become an inevitable choice for the development of long-distance oil and natural gas pipelines.

[0003] The role of metal pipes in transportation is mainly reflected in the following aspects: (1) High safety: Due to its hard material and high hardness and strength, metal pipes can withstand a lot of pressure and load, avoiding the possibility of accidents such as explosions and leaks. In addition, metal pipes are equipped with multiple protection measures such as explosion-proof doors, anti-drop, and anti-collision, which further improve the safety of transportation. (2) Strong adaptability: Metal pipe transportation is applicable to a variety of industries, including oil, natural gas, communications, and electricity. It is not only suitable for long-distance transportation, but also for short-distance transportation within the city, with strong adaptability and flexibility. (4) Low cost: Compared with other modes of transportation, metal pipe transportation has a lower cost. During the transportation process, the maintenance cost and transportation cost of metal pipes are very low. At the same time, a metal pipe can be used multiple times, saving a lot of capital expenditure. (5) Special use: In special environments, such as the construction of the Qinghai-Tibet Railway, metal pipes (especially low-temperature hot rods) play a key role. These metal pipes act as "low-temperature heat rods" that stabilize the permafrost layer through their one-way heat transfer characteristics, preventing the roadbed from sinking due to melting of the permafrost, and ensuring the stability of the railway.

[0004] However, the current metal tube forming device cannot meet the flexible change of metal tube size, and the forming process is complicated, the forming efficiency is low, and the production cost is high. Therefore, the art needs to develop a large-size cross-section internal spiral rib metal tube forming device and method that can effectively solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to provide a forming device and method for a large-size cross-section internal spiral rib metal tube. The device can be installed with metal tube blanks of different sizes for forming process, and there is no need to heat the metal tube blank before forming, which effectively reduces energy waste, reduces production costs, and improves forming efficiency.

[0006] To achieve the above-mentioned purpose, the present invention provides a forming device for a metal tube with spiral ribs in a large-size cross-section, comprising a mounting table, wherein a first fixed block and a second fixed block are respectively provided at two ends of the top of the mounting table; the first fixed block is slidably connected to the mounting table, and the second fixed block is fixedly connected to the mounting table; a mounting frame is provided on the side of the first fixed block close to the second fixed block, the side of the second fixed block close to the first fixed block is connected to one end of a rotating rod, and the other end of the rotating rod is provided with a core rod with a spiral groove and a round rod in sequence; the outer surface of the round rod is provided with a plurality of planetary-arranged rolling rollers.

[0007] Preferably, a first telescopic cylinder is provided at one end of the top of the mounting platform close to the first fixed block, and the output end of the first telescopic cylinder is connected to the first fixed block; a slider is provided at the bottom of the first fixed block, and a slideway matching the slider is provided at the contact point between the top of the mounting platform and the slider.

[0008] Preferably, a fixing plate is provided inside the mounting frame, a second telescopic cylinder is provided at both upper and lower ends of the fixing plate, a through hole is provided on the mounting frame, the output ends of the second telescopic cylinder extend to the outside of the mounting frame through the through hole and are provided with a fixing plate; an anti-slip pad is provided on the side of the fixing plate away from the second telescopic cylinder.

[0009] Preferably, a motor is provided on a side of the second fixing block away from the first fixing block, and a mounting hole is provided on a side of the second fixing block close to the first fixing block, and the rotating rod is connected to the output end of the motor through the mounting hole.

[0010] Preferably, an active chamber is provided inside the second fixed block, and the active chamber is movably connected to the second fixed block through a turntable bearing; a third telescopic cylinder is provided on both sides of the active chamber, and a fixing clamp is provided at the output end of the third telescopic cylinder; the fixing clamp matches the shape of the rotating rod, and an anti-slip pad is provided on the side of the fixing clamp close to the rotating rod.

[0011] Preferably, a cooling rack is provided on one side of the mounting platform, and a water spray head is provided on the cooling rack, and the water spraying position of the water spray head matches the position of the roller.

[0012] A method for forming a large-size cross-section internal spiral rib metal tube comprises the following steps: Step S1, installing the metal tube blank; Put one end of the metal tube blank on the outside of the mounting frame, start the second telescopic cylinder, and fix the metal tube blank on the mounting frame by moving the fixing plate; Step S2, installing the rotating rod; Select a rotating rod that matches the mandrel and the metal tube blank, connect the end of the rotating rod away from the mandrel to the output end of the motor through the mounting hole, start the third telescopic cylinder, and fix the rotating rod in the movable chamber through the fixing clamp; Step S3, moving the metal tube blank; Start the first telescopic cylinder to move the metal tube blank close to one end of the mounting frame to the round rod, and move the roller so that the roller is pressed against the outside of the metal tube blank; Step S4, forming; Step S41, starting the motor, the roller, and the first telescopic cylinder at the same time, pulling the metal tube blank, reducing the thickness and wall of the metal tube blank by high-speed spinning of the roller, and continuously filling the spiral groove on the surface of the mandrel; Step S42, then extrude along the spiral line direction of the mandrel to form spiral ribs, and finally form a spiral rib metal tube with a large cross-section.

[0013] Preferably, in step S41, during the high-speed spinning of the steel pipe by the roller, a water spray head is started to spray water onto the roller.

[0014] The present invention adopts the above-mentioned large-size cross-section internal spiral rib metal tube forming device and method, and the beneficial effects are as follows: (1) The forming device of the present invention can be suitable for metal tube blanks of different sizes and has high practicality; (2) The forming device of the present invention can process internal spiral ribs of different specifications, and the installation and removal of the core rod are simple and quick, and the adjustment is flexible; (3) The molding manufacturing method of the present invention does not require heating of the metal tube blank before molding, which effectively reduces energy waste and does not require intermediate annealing treatment, thereby simplifying the molding manufacturing process, reducing production costs, and effectively improving production efficiency.

[0015] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of a forming device of an embodiment of a forming device and method for a metal tube with large-size internal spiral ribs according to the present invention; Figure 2 This is an embodiment of a forming device and method for a large-size cross-section spiral rib metal tube of the present invention. Figure 1 Enlarged view of point A in the middle; Figure 3 It is a schematic diagram of the internal structure of a mounting frame of an embodiment of a forming device and method for a large-size cross-section internal spiral rib metal tube of the present invention; Figure 4 It is a structural schematic diagram of the second mounting block of an embodiment of a forming device and method for a metal tube with internal spiral ribs of a large-size cross section according to the present invention; Figure 5 It is a partial structural schematic diagram of a mandrel in an embodiment of a forming device and method for a metal tube with large-size internal spiral ribs according to the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] 1. Mounting table; 2. First fixed block; 3. Second fixed block; 4. Mounting frame; 5. Turntable; 6. Mandrel; 7. Round rod; 8. Roller; 9. First telescopic cylinder; 10. Slider; 11. Slide; 12. Fixed plate; 13. Second telescopic cylinder; 14. Fixed plate; 15. Anti-skid pad; 16. Motor; 17. Mounting hole; 18. Activity room; 19. Turntable bearing; 20. Third telescopic cylinder; 21. Fixed clamp; 22. Cooling frame; 23. Sprinkler head; 24. Metal tube blank. DETAILED DESCRIPTION

[0018] The technical solution of the present invention is further described below through the accompanying drawings and embodiments.

[0019] Unless otherwise defined, technical or scientific terms used in the present invention shall have the common meanings understood by one having ordinary skills in the field to which the present invention belongs.

[0020] Example like Figure 1 As shown, a forming device for a metal tube with spiral ribs inside a large cross section includes a mounting platform 1, and a first fixing block 2 and a second fixing block 3 are respectively provided at two ends of the top of the mounting platform 1. The first fixing block 2 is slidably connected to the mounting platform 1, and the second fixing block 3 is fixedly connected to the mounting platform 1. By moving the first fixing block 2, the metal tube blank 24 can be moved and formed.

[0021] A first telescopic cylinder 9 is provided at one end of the top of the mounting platform 1 near the first fixing block 2, and the output end of the first telescopic cylinder 9 is connected to the first fixing block 2. Figure 2 As shown, a slider 10 is provided at the bottom of the first fixed block 2, and a slideway 11 matching the slider 10 is provided at the top of the mounting platform 1 where the slider 10 contacts the top of the mounting platform 1. Through the interaction between the slider 10 and the slideway 11, the first telescopic cylinder 9 is activated to move the first fixed block 2 on the mounting platform 1.

[0022] A mounting frame 4 is provided on one side of the first fixing block 2 close to the second fixing block 3. Figure 3 As shown, a fixing plate 12 is provided inside the mounting frame 4, and a second telescopic cylinder 13 is provided at both upper and lower ends of the fixing plate 12. A through hole is provided on the mounting frame 4, and the output ends of the second telescopic cylinder 13 extend to the outside of the mounting frame 4 through the through hole and are provided with a fixing plate 14. The fixing plate 14 is provided with an anti-skid pad 15 on one side away from the second telescopic cylinder 13, and the anti-skid pad 15 not only improves the stability of the metal tube blank 24 on the mounting frame 4, but also prevents the fixing plate 14 from damaging the metal tube blank 24 when fixing the metal tube blank 24.

[0023] like Figure 4-Figure 5As shown, the second fixed block 3 is connected to one end of the rotating rod 5 on the side close to the first fixed block 2, and the other end of the rotating rod 5 is provided with a mandrel 6 with a spiral groove and a round rod 7 in sequence. The outer surface of the round rod 7 is provided with a plurality of rollers 8 arranged in a planetary manner. The second fixed block 3 is provided with a motor 16 on the side away from the first fixed block 2, and a mounting hole 17 is provided on the side close to the first fixed block 2, and the rotating rod 5 is connected to the output end of the motor 16 through the mounting hole 17. An active chamber 18 is provided inside the second fixed block 3, and the active chamber 18 is movably connected to the second fixed block 3 through a turntable bearing 19. When the motor 16 is started, the active chamber 18 can be rotated together with the rotating rod 5 through the turntable bearing 19.

[0024] A third telescopic cylinder 20 is provided on both sides of the activity chamber 18, and a fixing clamp 21 is provided at the output end of the third telescopic cylinder 20. The fixing clamp 21 matches the shape of the rotating rod 5, and a non-slip pad 15 is provided on the side of the fixing clamp 21 close to the rotating rod 5. A cooling rack 22 is provided on one side of the mounting platform 1, and a water spray head 23 is provided on the cooling rack 22. The water spraying position of the water spray head 23 matches the position of the roller 8. In order to prevent the temperature of the roller 8 from rising too high, the roller 8 is cooled by spraying water through the water spray head 23 to ensure that the surface temperature of the roller 8 is below 100 degrees Celsius, thereby preventing the softening or melting of the metal tube blank 24 caused by the excessive temperature of the roller 8, and adhering to the surface of the roller 8 so that the roller 8 cannot be used.

[0025] A method for forming a large-size cross-section internal spiral rib metal tube comprises the following steps: Step S1, installing the metal tube blank 24.

[0026] One end of the metal tube blank 24 is sleeved on the outside of the mounting frame 4, and the second telescopic cylinder 13 is started to fix the metal tube blank 24 on the mounting frame 4 by moving the fixing plate 14.

[0027] Step S2, installing the rotating rod 5.

[0028] Select a rotating rod 5 that matches the core rod 6 and the metal tube blank 24, connect the end of the rotating rod 5 away from the core rod 6 to the output end of the motor 16 through the mounting hole 17, start the third telescopic cylinder 20, and fix the rotating rod 5 in the activity chamber 18 through the fixing clamp 21.

[0029] Step S3, moving the metal tube 24.

[0030] The first telescopic cylinder 9 is started to move the metal tube blank 24 close to one end of the mounting frame 4 to the round rod 7, and the roller 8 is moved so that the roller 8 is pressed against the outer side of the metal tube blank 24.

[0031] Step S4: forming.

[0032] Step S41, start the motor 16, the roller 8, and the first telescopic cylinder 9 at the same time, pull the metal tube blank 24, and use the roller 8 to spin the metal tube blank 24 at high speed to reduce the wall thickness and continuously fill the spiral groove on the surface of the mandrel 6.

[0033] During the high-speed spinning of the steel pipe by the roller 8, the water spray head 23 is started to spray water onto the roller 8.

[0034] Step S42, then extrude along the spiral line direction of the mandrel 6 to form spiral ribs, and finally form a metal tube with spiral ribs in a large-size cross-section.

[0035] Therefore, the present invention adopts the above-mentioned large-size cross-section internal spiral rib metal tube forming device and method. The device can install metal tube blanks of different sizes for forming process, and there is no need to heat the metal tube blank before forming, which effectively reduces energy waste, reduces production costs, and improves forming efficiency.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. A forming device for a large-size cross-section internal spiral ribbed metal tube, characterized in that: It includes a mounting platform, and the first fixed block and the second fixed block are respectively provided at the two ends of the top of the mounting platform; the first fixed block is slidably connected to the mounting platform, and the second fixed block is fixedly connected to the mounting platform; a mounting frame is provided on the side of the first fixed block close to the second fixed block, and the side of the second fixed block close to the first fixed block is connected to one end of a rotating rod, and the other end of the rotating rod is sequentially provided with a mandrel with a spiral groove and a round rod; the outer surface of the round rod is provided with a plurality of planetary arranged rollers.

2. The forming device of a large-size cross-section internal spiral rib metal tube according to claim 1, characterized in that: A first telescopic cylinder is provided at one end of the top of the mounting platform close to the first fixed block, and the output end of the first telescopic cylinder is connected to the first fixed block; a sliding block is provided at the bottom of the first fixed block, and a slideway matching the sliding block is provided at the contact point between the top of the mounting platform and the sliding block.

3. The forming device for a large-size cross-section internal spiral rib metal tube according to claim 1, characterized in that: A fixing plate is provided inside the mounting frame, and a second telescopic cylinder is provided at both upper and lower ends of the fixing plate. A through hole is provided on the mounting frame, and output ends of the second telescopic cylinder extend to the outside of the mounting frame through the through hole and are provided with a fixing plate; an anti-slip pad is provided on one side of the fixing plate away from the second telescopic cylinder.

4. The forming device for a large-size cross-section internal spiral rib metal tube according to claim 1, characterized in that: A motor is arranged on a side of the second fixing block away from the first fixing block, and a mounting hole is arranged on a side of the second fixing block close to the first fixing block, through which the rotating rod is connected to the output end of the motor.

5. The forming device for a large-size cross-section internal spiral rib metal pipe according to claim 4, characterized in that: An activity chamber is provided inside the second fixed block, and the activity chamber is movably connected to the second fixed block through a turntable bearing; third telescopic cylinders are provided on both sides of the activity chamber, and a fixing clamp is provided at the output end of the third telescopic cylinder; the fixing clamp matches the shape of the rotating rod, and an anti-slip pad is provided on the side of the fixing clamp close to the rotating rod.

6. The forming device for a large-size cross-section internal spiral rib metal tube according to claim 1, characterized in that: A cooling rack is arranged on one side of the mounting platform, and a water spray head is arranged on the cooling rack, and the water spraying position of the water spray head matches the position of the roller.

7. A method for forming a large-size cross-section internal spiral rib metal tube as claimed in claims 1 to 6, characterized in that: The following steps are involved: Step S1, installing the metal tube blank; Put one end of the metal tube blank on the outside of the mounting frame, start the second telescopic cylinder, and fix the metal tube blank on the mounting frame by moving the fixing plate; Step S2, installing the rotating rod; Select a rotating rod that matches the mandrel and the metal tube blank, connect the end of the rotating rod away from the mandrel to the output end of the motor through the mounting hole, start the third telescopic cylinder, and fix the rotating rod in the movable chamber through the fixing clamp; Step S3, moving the metal tube blank; Start the first telescopic cylinder to move the metal tube blank close to one end of the mounting frame to the round rod, and move the roller so that the roller is pressed against the outside of the metal tube blank; Step S4, forming; Step S41, starting the motor, the roller, and the first telescopic cylinder at the same time, pulling the metal tube blank, reducing the thickness and wall of the metal tube blank by high-speed spinning of the roller, and continuously filling the spiral groove on the surface of the mandrel; Step S42, then extrude along the spiral line direction of the mandrel to form spiral ribs, and finally form a spiral rib metal tube with a large cross-section.

8. The method for preparing a forming device for a large-size cross-section internal spiral rib metal tube according to claim 7, characterized in that: In step S41, during the high-speed spinning of the steel pipe by the roller, the water spray head is started to spray water onto the roller.

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