Die for accurately controlling outer diameter of hot-rolled seamless steel pipe

Abstract

The utility model discloses a die for accurately controlling the outer diameter of a hot-rolled seamless steel pipe, which relates to the technical field of seamless steel pipe processing and comprises a workbench, a clamp disc slidably mounted on the workbench, a die rod clamped and mounted on the clamp disc, a sliding frame slidably mounted in a through groove, and a rotating ring rotatably mounted in the sliding frame. A square frame is fixedly mounted in the rotating ring, mounting frames are movably mounted on the four edges of the interior of the square frame, extrusion rollers are rotationally mounted in the four mounting frames, hydraulic cylinders are fixedly mounted on the four edges of the exterior of the square frame, a gear ring is fixedly mounted on the outer ring of the rotating ring, and a third motor is fixedly mounted at the top end of the sliding frame; according to the seamless steel pipe extrusion die, the die rod with the corresponding size is inserted into a seamless steel pipe in a penetrating mode according to the inner diameter size of the seamless steel pipe before the seamless steel pipe is extruded, and the inner diameter of the seamless steel pipe can be prevented from being reduced during extrusion.

Description

Technical Field

[0001] This utility model relates to the field of seamless steel pipe processing technology, specifically a mold for precise control of the outer diameter of hot-rolled seamless steel pipe. Background Technology

[0002] Seamless steel pipes are steel pipes made from a single piece of metal without any seams on their surface. Based on the production method, seamless pipes are classified into hot-rolled pipes, cold-rolled pipes, cold-drawn pipes, extruded pipes, and jacking pipes. According to their cross-sectional shape, seamless steel pipes are divided into round and irregular shapes. Irregularly shaped pipes include square, oval, triangular, hexagonal, seed-shaped, star-shaped, and finned pipes, among other complex shapes. Depending on their application, they are classified as thick-walled and thin-walled pipes. Seamless steel pipes are mainly used as oil and geological drilling pipes, cracking pipes for petrochemicals, boiler tubes, bearing tubes, and high-precision structural steel pipes for automobiles, tractors, and aviation.

[0003] To standardize the connection, hot-rolled seamless steel pipes require a sizing process to achieve standard inner and outer diameters. However, some existing hot-rolled seamless steel pipe outer diameter precision control molds only apply external pressure to the pipe during subsequent sizing after it has been pierced and removed from the casing. During the pressure process, the deformation caused by the pressure will cause the inner diameter of the seamless steel pipe to shrink, thus affecting the diameter accuracy of the seamless steel pipe. To address the above problems, the inventors propose a hot-rolled seamless steel pipe outer diameter precision control mold to solve the aforementioned issues. Utility Model Content

[0004] To address the problem that some existing hot-rolled seamless steel pipe outer diameter precision control molds only apply external pressure to the steel pipe during subsequent sizing processing after the seamless steel pipe is opened and removed, which causes the inner diameter of the seamless steel pipe to shrink and thus affects the diameter accuracy of the seamless steel pipe; the purpose of this utility model is to provide a hot-rolled seamless steel pipe outer diameter precision control mold.

[0005] To solve the above technical problems, this utility model adopts the following technical solution: a mold for precise control of the outer diameter of hot-rolled seamless steel pipe, including a worktable, a clamping plate slidably mounted on the worktable, a mold rod clamped and mounted on the clamping plate, and fixing rods fixedly mounted on both sides of one end of the mold rod. A baffle is detachably mounted on the end of the worktable away from the clamping plate. A storage cabinet is fixedly mounted on the lower surface of the worktable, a support base is slidably mounted inside the storage cabinet, and multiple hydraulic rods evenly distributed inside the storage cabinet are fixedly mounted, with the top end of the hydraulic rods fixed to the bottom end of the support base. The connection includes a through groove on the worktable, a sliding frame slidably installed in the through groove, a rotating ring rotatably installed in the sliding frame, a square frame fixedly installed in the rotating ring, mounting brackets movably installed on the four sides of the square frame, and extrusion rollers rotatably installed in the four mounting brackets. Hydraulic cylinders are fixedly installed on the four sides of the square frame, and the output ends of the hydraulic cylinders are fixedly connected to the corresponding mounting brackets. A gear ring is fixedly installed on the outer ring of the rotating ring. A third motor is fixedly installed on the top of the sliding frame, and a gear is fixedly installed on the output end of the third motor, with the gear meshing with the gear ring.

[0006] Preferably, a second lead screw is rotatably installed inside the worktable, and the second lead screw is threaded into the bottom end of the fixture plate. A second motor is fixedly installed at one end of the worktable, and the output end of the second motor is fixedly connected to one end of the second lead screw.

[0007] Preferably, a first lead screw is rotatably installed on both sides of the through groove, and the first lead screw is threaded into both sides of the sliding frame. A drive shaft is rotatably installed on one end of the worktable near the sliding frame. Two symmetrically distributed worm gears are fixedly installed on the drive shaft. A worm wheel is fixedly installed on one end of each of the two first lead screws, and the worm wheel meshes with the corresponding worm. A first motor is fixedly installed on one side of one end of the worktable, and the output end of the first motor is fixedly connected to one end of the drive shaft.

[0008] Preferably, a fixed frame is fixedly installed on the upper surface of the workbench, a support plate is slidably installed inside the fixed frame, a threaded rod is threadedly inserted into the workbench, and the top end of the threaded rod is rotatably connected to the lower surface of the support plate.

[0009] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0010] 1. In this utility model, by setting a mold rod, before extruding the seamless steel pipe, the mold rod of the corresponding size is inserted into the seamless steel pipe according to the inner diameter of the seamless steel pipe, which can prevent the inner diameter of the seamless steel pipe from shrinking during extrusion.

[0011] 2. In this utility model, the position of the extrusion roller can be adjusted by a hydraulic cylinder according to the processing requirements. Then, the sliding frame drives the extrusion roller to move along the outer ring of the seamless steel pipe. At the same time, a third motor drives the gear to rotate. The gear drives the rotating ring and the extrusion roller to rotate through the gear ring. This allows the extrusion roller to uniformly extrude the outer ring of the seamless steel pipe, thereby processing the outer diameter of the seamless steel pipe to the required size. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0014] Figure 2 This utility model Figure 1 Enlarged schematic diagram of the structure at point A in the middle;

[0015] Figure 3 This is a schematic diagram of the cross-sectional structure of the workbench of this utility model;

[0016] Figure 4 This is a schematic diagram of the cross-sectional structure of the sliding frame of this utility model;

[0017] Figure 5 This is a schematic diagram of the cross-sectional structure of the storage cabinet of this utility model.

[0018] In the diagram: 1. Workbench; 2. Fixture plate; 3. Mold rod; 4. Fixed frame; 5. Sliding frame; 6. Storage cabinet; 7. Support base; 8. Drive shaft; 9. Worm gear; 10. Worm wheel; 11. First motor; 12. Through slot; 13. Second motor; 14. Support plate; 15. Threaded rod; 16. First lead screw; 17. Rotating ring; 18. Square frame; 19. Gear ring; 20. Gear; 21. Third motor; 22. Mounting bracket; 23. Extrusion roller; 24. Hydraulic cylinder; 25. Hydraulic rod; 26. Second lead screw; 27. Fixed rod; 28. Baffle. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Example: Figure 1-5 As shown, this utility model provides a mold for precise control of the outer diameter of hot-rolled seamless steel pipe, including a workbench 1, a clamping plate 2 slidably mounted on the workbench 1, a mold rod 3 clamped and mounted on the clamping plate 2, and fixing rods 27 fixedly mounted on both sides of one end of the mold rod 3. The fixing rods 27 can move within a fixing frame 4 without contacting the inner wall of the fixing frame 4. A baffle 28 is detachably mounted on the end of the workbench 1 away from the clamping plate 2. A storage cabinet 6 is fixedly mounted on the lower surface of the workbench 1, and a support base 7 is slidably mounted inside the storage cabinet 6. Multiple hydraulic rods 25 are equidistantly distributed inside the storage cabinet 6, and the top ends of the hydraulic rods 25 are fixedly connected to the bottom ends of the support base 7. A through groove 12 is opened on the workbench 1, and a mold rod 3 is slidably mounted inside the through groove 12. A sliding frame 5 has a rotating ring 17 rotatably mounted inside it. A square frame 18 is fixedly mounted inside the rotating ring 17. Mounting brackets 22 are movably mounted on all four sides of the square frame 18. Extrusion rollers 23 are rotatably mounted inside each of the four mounting brackets 22. Hydraulic cylinders 24 are fixedly mounted on all four sides of the square frame 18, and the output ends of the hydraulic cylinders 24 are fixedly connected to the corresponding mounting brackets 22. A gear ring 19 is fixedly mounted on the outer ring of the rotating ring 17. A third motor 21 is fixedly mounted on the top of the sliding frame 5. A gear 20 is fixedly mounted on the output end of the third motor 21, and the gear 20 meshes with the gear ring 19. First, according to the inner diameter of the seamless steel pipe, one end of the mold rod 3 of the corresponding size is clamped and fixed on the fixture plate 2 in the center. The length of the mold rod 3 is greater than the length of the seamless steel pipe. A baffle 28, matching the mold rod 3, is bolted to one end of the workbench 1 near the sliding frame 5 (the baffle 28 has an insertion hole of the same diameter as the mold rod 3, into which one end of the mold rod 3 can be inserted). The center of the clamping disc 2 and the rotating ring 17 are on the same central axis. Then, the hot-rolled, perforated, and de-tubed seamless steel pipe is placed on the support base 7. The hydraulic rod 25 drives the support base 7 to rise and fall within the storage cabinet 6. The support base 7 drives the seamless steel pipe to rise and fall, aligning the seamless steel pipe and the rotating ring 17 on the same central axis. Next, the clamping disc 2 moves the mold rod 3 to penetrate and insert it into the seamless steel pipe. The fixing rod 27 then moves the seamless steel pipe, allowing it to pass through and be inserted into the seamless steel pipe. One end of the seamless steel pipe contacts the baffle 28 to clamp and fix the seamless steel pipe. Then, the hydraulic rod 25 drives the support seat 7 to descend and fully retract into the storage cabinet 6. Then, according to the processing requirements, the hydraulic cylinder 24 adjusts the position of the extrusion roller 23. Then, the sliding frame 5 drives the extrusion roller 23 to move along the outer ring of the seamless steel pipe. The extrusion roller 23 can extrude the outer ring of the seamless steel pipe. At the same time, the third motor 21 drives the gear 20 to rotate. The gear 20 drives the rotating ring 17 and the extrusion roller 23 to rotate through the gear ring 19. This allows the extrusion roller 23 to extrude the outer ring of the seamless steel pipe evenly, so that the outer diameter of the seamless steel pipe can be processed into the required size. At the same time, the mold rod 3 can prevent the inner diameter of the seamless steel pipe from shrinking during extrusion.

[0021] A second lead screw 26 is rotatably installed inside the workbench 1, and the second lead screw 26 is threaded into the bottom end of the clamping plate 2. A second motor 13 is fixedly installed at one end of the workbench 1, and the output end of the second motor 13 is fixedly connected to one end of the second lead screw 26.

[0022] By adopting the above technical solution, the second motor 13 drives the second lead screw 26 to rotate, and the second lead screw 26 drives the clamping disk 2 to move.

[0023] A first lead screw 16 is rotatably installed on both sides of the through groove 12, and the first lead screw 16 is threaded into both sides of the sliding frame 5. A drive shaft 8 is rotatably installed on one end of the worktable 1 near the sliding frame 5. Two symmetrically distributed worm gears 9 are fixedly installed on the drive shaft 8. A worm wheel 10 is fixedly installed on one end of each of the two first lead screws 16, and the worm wheel 10 meshes with the corresponding worm gear 9. A first motor 11 is fixedly installed on one side of one end of the worktable 1, and the output end of the first motor 11 is fixedly connected to one end of the drive shaft 8.

[0024] By adopting the above technical solution, the first motor 11 drives the drive shaft 8 to rotate, the drive shaft 8 drives the worm 9 to rotate, the worm 9 drives the worm wheel 10 to rotate, the worm wheel 10 drives the first lead screw 16 to rotate, and the first lead screw 16 drives the sliding frame 5 to slide in the through groove 12.

[0025] A fixed frame 4 is fixedly installed on the upper surface of the workbench 1. A support plate 14 is slidably installed inside the fixed frame 4. A threaded rod 15 is threadedly inserted into the workbench 1, and the top end of the threaded rod 15 is rotatably connected to the lower surface of the support plate 14.

[0026] By adopting the above technical solution, the threaded rod 15 can drive the support plate 14 to slide and lift within the fixed frame 4 to support one end of the mold rod 3 according to the diameter of different mold rods 3, so that the mold rod 3 remains straight.

[0027] Working Principle: In use, this invention first clamps and fixes one end of a mold rod 3 of the corresponding size to the fixture plate 2 according to the inner diameter of the seamless steel pipe. Then, a baffle 28 matching the mold rod 3 is bolted to the end of the workbench 1 near the sliding frame 5. Next, the hot-rolled, perforated, and de-tubed seamless steel pipe is placed on the support base 7. The hydraulic rod 25 drives the support base 7 to rise and fall within the storage cabinet 6, adjusting the seamless steel pipe's position so that the seamless steel pipe and the rotating ring 17 are on the same central axis. Then, the second motor 13 drives the second lead screw 26 to rotate, which in turn moves the fixture plate 2. The fixture plate 2 then moves the mold rod 3 to penetrate and insert it into the seamless steel pipe. The fixing rod 27 moves the seamless steel pipe, bringing one end of the pipe into contact with the baffle 28, thus advancing the seamless steel pipe. The clamping and fixing are then used. Next, the hydraulic rod 25 drives the support seat 7 to descend and fully retract into the storage cabinet 6. Then, according to the processing requirements, the hydraulic cylinder 24 is used to adjust the position of the extrusion roller 23, and the first motor 11 drives the drive shaft 8 to rotate. The drive shaft 8 drives the worm gear 9 to rotate, the worm gear 9 drives the worm wheel 10 to rotate, and the worm wheel 10 drives the first lead screw 16 to rotate. The first lead screw 16 drives the sliding frame 5 to slide in the through groove 12. The extrusion roller 23 can extrude the outer ring of the seamless steel pipe. At the same time, the third motor 21 drives the gear 20 to rotate. The gear 20 drives the rotating ring 17 and the extrusion roller 23 to rotate through the gear ring 19. This allows the extrusion roller 23 to uniformly extrude the outer ring of the seamless steel pipe, thereby processing the outer diameter of the seamless steel pipe to the required size. Meanwhile, the mold rod 3 can prevent the inner diameter of the seamless steel pipe from shrinking during extrusion.

[0028] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A mold for precisely controlling the outer diameter of a hot-rolled seamless steel pipe, comprising a worktable (1), characterized in that: A clamping plate (2) is slidably mounted on the workbench (1). A mold rod (3) is clamped and mounted on the clamping plate (2). Fixing rods (27) are fixedly mounted on both sides of one end of the mold rod (3). A baffle (28) is detachably mounted on the end of the workbench (1) away from the clamping plate (2). A storage cabinet (6) is fixedly mounted on the lower surface of the workbench (1). A support base (7) is slidably mounted inside the storage cabinet (6). Multiple hydraulic rods (25) are fixedly mounted equidistantly inside the storage cabinet (6), and the top of the hydraulic rods (25) is fixedly connected to the bottom of the support base (7). A through groove (12) is opened on the workbench (1). A sliding frame (5) is slidably mounted inside the through groove (12). A rotating ring (17) is rotatably installed inside the moving frame (5). A square frame (18) is fixedly installed inside the rotating ring (17). Mounting brackets (22) are movably installed on all four sides of the square frame (18). Extrusion rollers (23) are rotatably installed in all four mounting brackets (22). Hydraulic cylinders (24) are fixedly installed on all four sides of the square frame (18). The output end of the hydraulic cylinder (24) is fixedly connected to the corresponding mounting bracket (22). A toothed ring (19) is fixedly installed on the outer ring of the rotating ring (17). A third motor (21) is fixedly installed at the top of the sliding frame (5). A gear (20) is fixedly installed at the output end of the third motor (21). The gear (20) meshes with the toothed ring (19).

2. The hot-rolled seamless steel pipe outer diameter precision control mold as described in claim 1, characterized in that, The workbench (1) is rotatably mounted with a second lead screw (26), and the second lead screw (26) is threaded into the bottom end of the clamping plate (2).

3. The hot-rolled seamless steel pipe outer diameter precision control mold as described in claim 1, characterized in that, A second motor (13) is fixedly installed at one end of the workbench (1), and the output end of the second motor (13) is fixedly connected to one end of the second lead screw (26).

4. The hot-rolled seamless steel pipe outer diameter precision control mold as described in claim 1, characterized in that, The first lead screw (16) is rotatably installed on both sides of the through groove (12), and the first lead screw (16) is threaded into both sides of the sliding frame (5).

5. The hot-rolled seamless steel pipe outer diameter precision control mold as described in claim 1, characterized in that, The workbench (1) is rotatably mounted with a drive shaft (8) at one end near the sliding frame (5), and two symmetrically distributed worm gears (9) are fixedly mounted on the drive shaft (8).

6. The hot-rolled seamless steel pipe outer diameter precision control mold as described in claim 4, characterized in that, One end of each of the two first lead screws (16) is fixedly equipped with a worm wheel (10), and the worm wheel (10) meshes with the corresponding worm (9).

7. The hot-rolled seamless steel pipe outer diameter precision control mold as described in claim 1, characterized in that, A first motor (11) is fixedly installed on one side of one end of the workbench (1), and the output end of the first motor (11) is fixedly connected to one end of the drive shaft (8).

8. The hot-rolled seamless steel pipe outer diameter precision control mold as described in claim 1, characterized in that, A fixed frame (4) is fixedly installed on the upper surface of the workbench (1), and a support plate (14) is slidably installed inside the fixed frame (4). A threaded rod (15) is threadedly inserted into the workbench (1), and the top end of the threaded rod (15) is rotatably connected to the lower surface of the support plate (14).

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