A high-strength steel pipe manufacturing process and its end processing equipment

Abstract

This invention discloses a high-strength steel pipe production process and its end processing equipment, belonging to the field of steel pipe production technology. It is used to process steel pipes and includes an inner and outer double-fixing assembly. The left end of the steel pipe is connected to the inner and outer double-fixing assembly, and the outer end of the inner and outer double-fixing assembly is connected to a tool position adjustment assembly. The inner and outer double-fixing assembly includes an inner spreading and fixing assembly and an outer clamping assembly. The inner wall of the left end of the steel pipe is in contact with the inner spreading and fixing assembly, and the outer side of the left end of the steel pipe is in contact with the outer clamping assembly. Activating the inner spreading and fixing assembly and the outer clamping assembly allows the inner spreading and fixing assembly to position and support the steel pipe from the inside, while the outer clamping assembly squeezes the steel pipe from the outside and positions and supports the tool position adjustment assembly, making the positioning and fixing of the processing equipment more accurate and stable. Activating the tool position adjustment assembly adjusts the distance between the tool and the steel pipe.

Description

Technical Field

[0001] This invention relates to the field of steel pipe production technology, specifically to a high-strength steel pipe production process and its end processing equipment. Background Technology

[0002] When steel pipes are produced, their length may not be sufficient for use, so welding is required. Before welding, the ends of the steel pipes need to be beveled to improve the sealing of the weld and make it more perfect. Beveling the ends of the steel pipes requires beveling equipment.

[0003] For example, Chinese patent CN115990692B discloses a spiral steel pipe beveling device, including an internal support mechanism and a beveling treatment mechanism. The internal support mechanism includes a main frame and multiple internal support components arranged circumferentially on the main frame. Each internal support component includes a threaded rod rotatably mounted on the main frame, an internal support foot hingedly mounted on the main frame, a drive block and a transmission rod slidably mounted on the main frame. The threaded rod is threadedly connected to the drive block, one end of the transmission rod is hinged to the drive block, and the other end of the transmission rod is hinged to the internal support foot. The beveling treatment mechanism includes two drive cylinders, a feed frame, a rotating frame, and two beveling cutter assemblies symmetrically mounted on the rotating frame. The drive cylinders are fixedly mounted on the main frame, the feed frame is fixedly mounted on the output end of the drive cylinders, and the rotating frame is rotatably mounted on the feed frame. A first drive component is mounted on the feed frame to provide power for the rotation of the rotating frame.

[0004] However, the aforementioned patent requires manual tightening of screws on the outside before fixing the steel pipe end during processing, which is cumbersome. Furthermore, manual tightening of bolts may result in insufficient precision, leading to inaccurate tool positioning and processing errors.

[0005] Existing steel pipe manufacturing processes produce steel pipes with high strength but poor plasticity, and those with good plasticity but low strength.

[0006] Based on this, the present invention designs a high-strength steel pipe production process and its end processing equipment to solve the above problems. Summary of the Invention

[0007] In view of the above-mentioned shortcomings of the existing technology, the present invention provides a high-strength steel pipe production process and its end processing equipment.

[0008] To achieve the above objectives, the present invention provides the following technical solution:

[0009] A manufacturing process for high-strength steel pipes includes the following steps:

[0010] I. Solid cylindrical steel pipe raw materials are selected as steel billets, which include the following components by weight ratio: C: 0.23-0.35%, Cr: 4.83-5.11%, Nb: 0.16-0.21%, Ni: 1.25-1.53%, Mo: 3.56-4.23%, Si: 0.95-1.35%, V: 0.32-0.57%, with the balance being Fe and other unavoidable impurities;

[0011] 2. Feed the raw steel billet into the cutting device and cut it into cylindrical steel segments of the required length;

[0012] 3. The steel segment obtained in step 2 is sent into a ring furnace and heated to 1350-1385℃;

[0013] 4. The product obtained in step 3 is fed into a piercing machine for rod piercing and annealed to 900-935℃, and then held at that temperature for 1.75-2.13 hours.

[0014] 5. Anneal the product obtained in step 4 to 715-735℃ and hold for 4 hours;

[0015] 6. Heat the product obtained in step 5 to 1065-1135℃ for oil quenching, then temper it twice at a temperature of 525-530℃. After tempering, restore it to room temperature and send it to the end processing equipment for end beveling to obtain the required high-strength steel pipe.

[0016] An end-processing device for processing steel pipes, comprising internal and external double fixing components;

[0017] The left end of the steel pipe is connected to a double fixing assembly that can fix the processing equipment to the steel pipe from both the inside and outside.

[0018] The outer end of the inner and outer double fixing components is connected to a tool position adjustment component that can synchronously adjust the distance between each tool and the steel pipe;

[0019] The left end of the tool position adjustment assembly is connected to a circumferential cutting drive assembly for supporting the tool position adjustment assembly and driving the tool to process the steel pipe;

[0020] The internal and external double fixing components include an internal spreading and fixing component and an external clamping component. The internal spreading and fixing component is connected to the inner wall of the left end of the steel pipe, and the external clamping component is connected to the outer side of the left end of the steel pipe. The left end of the internal spreading and fixing component is rotatably connected to a circumferential cutting drive component, and the outer end of the external clamping component is connected to a tool position adjustment component.

[0021] Furthermore, the internal expansion and fixing assembly includes a support tube, a first motor, a first threaded rod, a first threaded sleeve, a first linkage rod, a second linkage rod, a support plate, and a limiting slide groove. The right end of the support tube is inserted into the interior of the steel pipe. The first motor is fixedly connected to the left side wall of the support tube. The output end of the first motor passes through the left side wall of the support tube and is fixedly connected to the first threaded rod. The right end of the first threaded rod is located inside the left end of the first threaded sleeve and is threadedly connected to the first threaded sleeve. The left end of the first threaded sleeve is located inside the support tube and is slidably connected to the support tube. The right end of the first threaded sleeve is rotatably connected to several sets of first linkage rods. Each set of first linkage rods is rotatably connected to a second linkage rod on the support tube to the left. The intersections of the first and second linkage rods that are close to each other are rotatably connected by a rotating shaft. The end of the support plate near the first and second linkage rods is provided with a limiting groove. The ends of the first and second linkage rods near the support plate are slidably connected to the limiting groove by a rotating shaft. The side wall of the support plate away from the support tube is in contact with the inner wall of the steel pipe. The left end of the support tube is rotatably connected to a ring cutting drive assembly.

[0022] Furthermore, the external clamping assembly includes a support ring, a locking ring, a pressing rotating rod, a linkage support rod, a second motor, a first gear, and a first rack. The left end of the steel pipe passes through the support ring and the locking ring. The left end of the support ring is rotatably connected to the locking ring. Several sets of pressing rotating rods are rotatably connected to the inner wall of the support ring. Several sets of linkage support rods corresponding to the pressing rotating rods are rotatably connected to the inner wall of the locking ring. The end of the linkage support rod closest to the pressing rotating rod is rotatably connected to the pressing rotating rod. The outer end of the support ring is fixedly connected to the second motor. The output end of the second motor is fixedly connected to the first gear. The locking ring inside the first gear is fixedly connected to the first rack. The first gear and the first rack are meshed together. The outer end of the support ring is connected to a tool position adjustment assembly.

[0023] Furthermore, the circumferential cutting drive assembly includes a drive rotating plate, a fixed ring, a fifth motor, a third gear, and a third rack. The drive rotating plate is movably connected to the outer wall of the support pipe on the left side of the steel pipe. The support pipe passes through the drive rotating plate. The fixed ring is rotatably connected to the outer side of the drive rotating plate. The fifth motor is fixedly connected to the left side wall of the fixed ring. The output end of the fifth motor passes through the fixed ring and is fixedly connected to the third gear. The third rack is fixedly connected to the outer end of the right side wall of the drive rotating plate. The third gear meshes with the third rack. The inner end of the drive rotating plate is connected to a tool position adjustment assembly. The right end of the fixed ring is fixedly connected to a tool position adjustment assembly.

[0024] Furthermore, the tool position adjustment assembly includes a phase distance synchronization adjustment assembly and a left and right position adjustment assembly. The inner end of the drive plate is connected to the phase distance synchronization adjustment assembly, and the right side wall of the fixed ring is fixedly connected to the left and right position adjustment assembly. The right end of the left and right position adjustment assembly is connected to the outer end of the support ring.

[0025] Furthermore, the phase position synchronization adjustment component includes an adjusting plate, an inclined slide groove, a straight slide groove, a slide rod, a sliding tool holder, a third motor, an arc-shaped adjusting groove, a second gear, and a second rack. The adjusting plate is rotatably connected to the left side wall of the driving plate. Several sets of inclined slide grooves are opened at the outer end of the adjusting plate. A set of straight slide grooves is opened on the driving plate to the right of the inclined slide grooves. A set of sliding tool holders is slidably connected to the driving plate to the right of the straight slide grooves. A slide rod is fixedly connected to the left side wall of the sliding tool holders. The slide rod passes through the straight slide grooves and the inclined slide grooves and is slidably connected to both the straight slide grooves and the inclined slide grooves. The third motor is fixedly connected to the left side wall of the adjusting plate. An arc-shaped adjusting groove is opened on the driving plate to the right of the third motor. The output end of the third motor passes through the adjusting plate and is fixedly connected to the second gear. A second rack is opened on the inner wall of the arc-shaped adjusting groove. The second gear meshes with the second rack. A tool is fixedly connected to the end of the sliding tool holder near the steel pipe.

[0026] Furthermore, the left and right position adjustment assembly includes a fourth motor, a second threaded rod, a second threaded sleeve, and a limiting guide slide rod. The fourth motor is fixedly connected to the outer end of the support ring, and the second threaded rod is fixedly connected to the output end of the fourth motor. The left end of the second threaded rod is inserted into the interior of the second threaded sleeve and threadedly connected to the second threaded sleeve. The left end of the second threaded sleeve is fixedly connected to the right side wall of the fixed ring. Several sets of limiting guide slide rods are fixedly connected to the right side wall of the fixed ring. The right ends of the limiting guide slide rods all pass through the outer end of the support ring and are slidably connected to the support ring.

[0027] The present invention has the following technical effects:

[0028] This invention utilizes raw materials with high Ni and Mo content to produce steel pipes with high strength. After the rod threading operation, two annealing and heat treatment processes reduce the hardness of the semi-finished product, improve its plasticity and toughness, and eliminate internal stress, thus better preparing it for quenching and ensuring that no defects occur during quenching. The two tempering processes after quenching fully adjust the hardness, strength, plasticity, and toughness of the workpiece. By adjusting the tempering temperature, a high-strength finished product is obtained, resulting in steel pipes with both good strength and plasticity.

[0029] When the left end of the steel pipe needs to be processed, the right end of the support pipe is inserted into the steel pipe. At this time, the first motor is started, and the output end of the first motor drives the first threaded rod to rotate. The first threaded rod drives the first threaded sleeve to move closer to the support pipe under the limiting guidance of the support pipe. The first threaded sleeve drives the end of the first linkage rod near the first threaded sleeve to move to the left, so that the inner ends of the first linkage rod and the second linkage rod move closer to each other. Since the intersection of the first linkage rod and the second linkage rod is rotatably connected, the outer ends of the first linkage rod and the second linkage rod move closer to each other under the limiting guidance of the limiting slide groove. This causes the outer ends of the first linkage rod and the second linkage rod to move away from the first threaded sleeve. Thus, the first linkage rod and the second linkage rod drive the support plate to move closer to the inner wall of the steel pipe through the limiting slide groove until the support plate contacts the inner wall of the steel pipe. At this time, the inner wall of the steel pipe is squeezed from all directions by the support plates, thereby achieving the positioning and fixation of the support pipe, and thus realizing the ring cutting drive assembly. Once the support tube is positioned and fixed, the second motor is activated. The output of the second motor drives the first gear to rotate. The first gear, through the first rack, drives the locking ring to rotate under the limit of the support ring. This causes the locking ring to drive the end of the linkage support rod near the locking ring to rotate. Consequently, the end of the linkage support rod near the extrusion rod drives the extrusion rod to move away from the support ring. Under the limit support of the support ring, the extrusion rod moves towards the steel pipe until it contacts the outer wall of the steel pipe. At this time, each set of extrusion rods simultaneously extrudes the steel pipe from all directions, thus achieving the positioning and fixing of the support ring and the locking ring, and further achieving the positioning and fixing of the tool position adjustment assembly. Moreover, it is not necessary to adjust and extrude each part of the outer side of the steel pipe one by one; simply starting the second motor is enough to achieve synchronous extrusion and fixing of the steel pipe in all directions. Since the positions of the support tube and the support ring are both positioned and fixed, the overall positioning and fixing of the processing equipment is achieved. Because the positioning and fixing are performed twice, from both the inner and outer sides of the steel pipe, the accuracy and stability of the positioning and fixing are guaranteed.

[0030] In this invention, once the processing equipment is positioned and fixed by the internal and external double fixing components and its position is adjusted by the tool position adjustment component, the fifth motor is started. The output of the fifth motor drives the third gear to rotate. The third gear, through the third rack, drives the drive plate to rotate under the limitation of the support tube and the fixing ring. This allows the drive plate to drive the tool through the tool position adjustment component to process the left end of the steel pipe, thus achieving the processing of the left end of the steel pipe. Additionally, when the internal and external double fixing components are positioned and fixed, the third motor is started. The output of the third motor drives the second gear to rotate. Since the drive plate is fixed under the limitation of the third gear, the second gear, through the second rack and the arc-shaped adjustment groove, drives the adjustment plate to rotate under the limitation of the drive plate. The adjustment plate drives the inclined slide groove to rotate, causing the inner wall of the inclined slide groove to press against the slide rods. This causes all the slide rods to reciprocate synchronously along the trajectory of the straight slide groove under the limitation of the straight slide groove. This causes the sliding rod to drive all the sliding tool holders to reciprocate synchronously along the trajectory of the straight sliding groove. This allows the sliding tool holders to move the tools synchronously away from or towards the support tube, achieving synchronous adjustment of the distance between the tools. This enables the processing of steel pipes of various sizes without the need for individual tool adjustment, saving time and effort while ensuring the accuracy of tool position. When the distance between the tools is adjusted, the fourth motor is activated. The output of the fourth motor drives the second threaded rod to rotate, which in turn drives the second threaded sleeve to move left and right. The second threaded sleeve, through the fixed ring, drives the drive rotating plate to slide left and right under the limit of the support tube. This causes the drive rotating plate to drive the tools to move left and right through the sliding tool holders, thus adjusting the left and right positions of the tools and, consequently, the distance between the tools and the steel pipe. Furthermore, during the processing of the left end of the steel pipe, adjusting the left and right positions of the tools allows for adjustment of the processing depth at the left end of the steel pipe. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0032] Figure 1 A three-dimensional end-processing device according to the present invention Figure 1 ;

[0033] Figure 2 This is a front view of an end-processing device according to the present invention;

[0034] Figure 3 This is a left view of an end-processing device according to the present invention;

[0035] Figure 4A three-dimensional end-processing device according to the present invention Figure 2 ;

[0036] Figure 5 A three-dimensional end-processing device according to the present invention Figure 3 ;

[0037] Figure 6 For along Figure 2 A sectional view along the AA direction;

[0038] Figure 7 For along Figure 3 BB direction sectional view;

[0039] Figure 8 for Figure 7 A magnified view of point C in the middle.

[0040] The labels in the diagram represent:

[0041] 1. Steel pipe; 2. Internal and external double fixing assembly; 21. Internal expansion fixing assembly; 211. Support pipe; 212. First motor; 213. First threaded rod; 214. First threaded sleeve; 215. First linkage rod; 216. Second linkage rod; 217. Support plate; 218. Limiting slide groove; 22. External clamping assembly; 221. Support ring; 222. Locking ring; 223. Extrusion rotating rod; 224. Linkage support rod; 225. Second motor; 226. First gear; 227. First rack; 3. Tool position adjustment assembly; 31. Phase 311. Position synchronization adjustment assembly; 312. Adjustment plate; 313. Inclined slide groove; 314. Straight slide groove; 315. Slide rod; 316. Sliding tool holder; 317. Third motor; 318. Arc-shaped adjustment groove; 319. Second gear; 32. Left and right position adjustment assembly; 321. Fourth motor; 322. Second threaded rod; 323. Second threaded sleeve; 324. Limiting guide slide rod; 4. Ring cutting drive assembly; 41. Drive plate; 42. Fixing ring; 43. Fifth motor; 44. Third gear; 45. Third rack. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0043] The present invention will be further described below with reference to embodiments.

[0044] The terms "left," "right," "front," "back," "up," and "down" used in the following description refer to the orientation from the perspective of the front view.

[0045] Example 1

[0046] This invention provides a manufacturing process for high-strength steel pipes, comprising the following steps:

[0047] I. Solid cylindrical steel pipe raw materials are selected as steel billets, which include the following components by weight ratio: C: 0.23%, Cr: 5.11%, Nb: 0.19%, Ni: 1.43%, Mo: 3.56%, Si: 1.35%, V: 0.32%, with the balance being Fe and other unavoidable impurities;

[0048] 2. Feed the raw steel billet into the cutting device and cut it into cylindrical steel segments of the required length;

[0049] 3. The steel segment obtained in step 2 is sent into a ring furnace and heated to 1350℃;

[0050] 4. The product obtained in step 3 is fed into a piercing machine for rod piercing and annealed to 935°C, and then held at that temperature for 1.95 hours.

[0051] 5. Anneal the product obtained in step 4 to 723℃ and hold for 4 hours;

[0052] 6. Heat the product obtained in step 5 to 1135℃ for oil quenching, then temper it twice at a tempering temperature of 530℃. After tempering, restore it to room temperature and send it to the end processing equipment for end beveling to obtain the required high-strength steel pipe.

[0053] By using raw materials with high Ni and Mo content, the processed steel pipes have high strength. After the bar threading operation, two annealing and heat treatments are performed to reduce the hardness of the semi-finished product after bar threading, improve its plasticity and toughness, and eliminate internal stress, thus better preparing it for quenching and ensuring that no defects occur during quenching. The hardness, strength, plasticity, and toughness of the workpiece are fully adjusted by two tempering processes after quenching. By adjusting the tempering temperature, a high-strength finished product is obtained, thus producing a steel pipe with good strength and plasticity.

[0054] Example 2

[0055] This invention provides a manufacturing process for high-strength steel pipes, comprising the following steps:

[0056] I. Solid cylindrical steel pipe raw material is selected as steel billet, which includes the following composition by weight ratio: C: 0.35%, Cr: 4.83%, Nb: 0.16%, Ni: 1.25%, Mo: 4.13%, Si: 1.23%, V: 0.57%, with the balance being Fe and other unavoidable impurities;

[0057] 2. Feed the raw steel billet into the cutting device and cut it into cylindrical steel segments of the required length;

[0058] 3. The steel segment obtained in step 2 is sent into a ring furnace and heated to 1385℃;

[0059] 4. The product obtained in step 3 is fed into a piercing machine for rod piercing and annealed to 935°C, and then held at that temperature for 1.75 hours.

[0060] 5. Anneal the product obtained in step 4 to 715℃ and hold for 4 hours;

[0061] 6. Heat the product obtained in step 5 to 1065℃ for oil quenching, then temper it twice at a tempering temperature of 525℃. After tempering, restore it to room temperature and send it to the end processing equipment for end beveling to obtain the required high-strength steel pipe.

[0062] Example 3

[0063] This invention provides a manufacturing process for high-strength steel pipes, comprising the following steps:

[0064] I. Solid cylindrical steel pipe raw material is selected as steel billet, which includes the following composition by weight ratio: C: 0.29%, Cr: 4.95%, Nb: 0.2%, Ni: 1.53%, Mo: 4.23%, Si: 0.95%, V: 0.35%, with the balance being Fe and other unavoidable impurities;

[0065] 2. Feed the raw steel billet into the cutting device and cut it into cylindrical steel segments of the required length;

[0066] 3. The steel segment obtained in step 2 is sent into the ring furnace and heated to 1365℃;

[0067] 4. The product obtained in step 3 is fed into a piercing machine for rod piercing and annealed to 920°C, and then held at that temperature for 2.13 hours.

[0068] 5. Anneal the product obtained in step 4 to 735℃ and hold for 4 hours;

[0069] 6. Heat the product obtained in step 5 to 1132℃ for oil quenching, then temper it twice at a tempering temperature of 526℃. After tempering, restore it to room temperature and send it to the end processing equipment for end beveling to obtain the required high-strength steel pipe.

[0070] Example 4

[0071] Please refer to the instruction manual appendix. Figure 1-8 An end-processing device for processing steel pipe 1, comprising inner and outer double fixing components 2;

[0072] The left end of the steel pipe 1 is connected to an inner and outer double fixing component 2, which can fix the processing equipment on the steel pipe 1 from both the inner and outer sides of the steel pipe 1;

[0073] The outer end of the inner and outer double fixing component 2 is connected to a tool position adjustment component 3, which can synchronously adjust the distance between each tool and the steel pipe 1;

[0074] The left end of the tool position adjustment assembly 3 is connected to a circumferential cutting drive assembly 4, which supports the tool position adjustment assembly 3 and drives the tool to process the steel pipe 1.

[0075] The inner and outer double fixing components 2 include an inner opening and fixing component 21 and an outer clamping component 22. The inner wall of the left end of the steel pipe 1 is in contact with the inner opening and fixing component 21, and the outer side of the left end of the steel pipe 1 is in contact with the outer clamping component 22. The left end of the inner opening and fixing component 21 is rotatably connected to the ring cutting drive component 4, and the outer end of the outer clamping component 22 is connected to the tool position adjustment component 3.

[0076] The internal support and fixing assembly 21 includes a support tube 211, a first motor 212, a first threaded rod 213, a first threaded sleeve 214, a first linkage rod 215, a second linkage rod 216, a support plate 217, and a limiting slide groove 218. The right end of the support tube 211 is inserted into the interior of the steel pipe 1. The first motor 212 is fixedly connected to the left side wall of the support tube 211. The output end of the first motor 212 passes through the left side wall of the support tube 211 and is fixedly connected to the first threaded rod 213. The right end of the first threaded rod 213 is located inside the left end of the first threaded sleeve 214 and is threadedly connected to the first threaded sleeve 214. The left end of the first threaded sleeve 214 is located inside the support tube 211 and is slidably connected to the support tube 211. A threaded sleeve 214 has several sets of first linkage rods 215 rotatably connected to its right end. Each set of first linkage rods 215 has a second linkage rod 216 rotatably connected to the support tube 211 to its left. The intersections of the first linkage rods 215 and the second linkage rods 216 that are close to each other are rotatably connected by a rotating shaft. The support plate 217 has a limit groove 218 at the end near the first linkage rods 215 and the second linkage rods 216. The ends of the first linkage rods 215 and the second linkage rods 216 that are close to the support plate 217 are slidably connected to the limit groove 218 by a rotating shaft. The side wall of the support plate 217 away from the support tube 211 is in contact with the inner wall of the steel pipe 1. The left end of the support tube 211 is rotatably connected to a ring cutting drive assembly 4.

[0077] The external clamping assembly 22 includes a support ring 221, a locking ring 222, a pressing rotating rod 223, a linkage support rod 224, a second motor 225, a first gear 226, and a first rack 227. The left end of the steel pipe 1 passes through the support ring 221 and the locking ring 222. The left end of the support ring 221 is rotatably connected to the locking ring 222. Several sets of pressing rotating rods 223 are rotatably connected to the inner wall of the support ring 221, and several sets of pressing rotating rods 223 are rotatably connected to the inner wall of the locking ring 222. Correspondingly, a linkage support rod 224 is rotatably connected to the extrusion rotating rod 223 at one end. A second motor 225 is fixedly connected to the outer end of the support ring 221. A first gear 226 is fixedly connected to the output end of the second motor 225. A first rack 227 is fixedly connected to the locking ring 222 inside the first gear 226. The first gear 226 and the first rack 227 are meshed together. A tool position adjustment assembly 3 is connected to the outer end of the support ring 221.

[0078] When the left end of steel pipe 1 needs to be processed, the right end of support pipe 211 is inserted into steel pipe 1. At this time, the first motor 212 is started. The output end of the first motor 212 drives the first threaded rod 213 to rotate. The first threaded rod 213 drives the first threaded sleeve 214 to move closer to the support pipe 211 under the limiting guide of the support pipe 211. The first threaded sleeve 214 drives the end of the first linkage rod 215 near the first threaded sleeve 214 to move to the left, so that the inner ends of the first linkage rod 215 and the second linkage rod 216 move closer to each other. Since the intersection of the first linkage rod 215 and the second linkage rod 216 is rotatably connected. This causes the outer ends of the first linkage rod 215 and the second linkage rod 216 to approach each other under the limiting guide of the limiting slide groove 218. This, in turn, causes the outer ends of the first linkage rod 215 and the second linkage rod 216 to move away from the first threaded sleeve 214. Consequently, the first linkage rod 215 and the second linkage rod 216, through the limiting slide groove 218, drive the support plate 217 to move closer to the inner wall of the steel pipe 1 until the support plate 217 contacts the inner wall of the steel pipe 1. At this point, the support plates 217 press against the inner wall of the steel pipe 1 from all directions, thus achieving the positioning and fixing of the support pipe 211, and thereby realizing the ring cutting drive. The positioning and fixing of the moving component 4: When the support tube 211 is positioned and fixed, the second motor 225 is started. The output end of the second motor 225 drives the first gear 226 to rotate. The first gear 226 drives the locking ring 222 to rotate under the limit of the support ring 221 through the first rack 227. This causes the locking ring 222 to drive the end of the linkage support rod 224 near the locking ring 222 to rotate. This causes the end of the linkage support rod 224 near the pressing rod 223 to drive the pressing rod 223 to move away from the support ring 221. Under the limit support of the support ring 221, the pressing rod 223 moves towards the steel pipe 1 until it reaches the connection point. When the steel pipe 1 is touched, each set of extrusion rods 223 simultaneously extrudes the steel pipe 1 from all directions, thereby achieving the positioning and fixing of the support ring 221 and the locking ring 222, and further achieving the positioning and fixing of the tool position adjustment assembly 3. Moreover, it is not necessary to adjust and extrude each part of the outer side of the steel pipe 1 one by one. Only the second motor 225 needs to be started to achieve synchronous extrusion and fixing of the steel pipe 1 in all directions. Since the positions of the support pipe 211 and the support ring 221 are both positioned and fixed, the overall positioning and fixing of the processing equipment is achieved. Since the positioning and fixing are performed twice from the inner and outer sides of the steel pipe 1, the accuracy and stability of the positioning and fixing are guaranteed.

[0079] The circumferential cutting drive assembly 4 includes a drive rotating plate 41, a fixed ring 42, a fifth motor 43, a third gear 44, and a third rack 45. The drive rotating plate 41 is movably connected to the outer wall of the support pipe 211 on the left side of the steel pipe 1. The support pipe 211 passes through the drive rotating plate 41. The fixed ring 42 is rotatably connected to the outer side of the drive rotating plate 41. The fifth motor 43 is fixedly connected to the left side wall of the fixed ring 42. The output end of the fifth motor 43 passes through the fixed ring 42 and is fixedly connected to the third gear 44. The third rack 45 is fixedly connected to the outer end of the right side wall of the drive rotating plate 41. The third gear 44 and the third rack 45 are meshed. The inner end of the drive rotating plate 41 is connected to the tool position adjustment assembly 3. The right end of the fixed ring 42 is fixedly connected to the tool position adjustment assembly 3.

[0080] When the processing equipment is positioned and fixed by the inner and outer double fixing components 2 and the position is adjusted by the tool position adjustment component 3, the fifth motor 43 is started. The output end of the fifth motor 43 drives the third gear 44 to rotate. The third gear 44 drives the drive plate 41 to rotate under the limit of the support tube 211 and the fixing ring 42 through the third rack 45. Thus, the drive plate 41 drives the tool to process the left end of the steel pipe 1 through the tool position adjustment component 3, thereby realizing the processing of the left end of the steel pipe 1.

[0081] Example 5

[0082] like Figure 1-8 As shown, in a preferred embodiment of the present invention, the tool position adjustment assembly 3 includes a phase distance position synchronization adjustment assembly 31 and a left and right position adjustment assembly 32. The inner end of the drive rotating plate 41 is connected to the phase distance position synchronization adjustment assembly 31, and the right side wall of the fixing ring 42 is fixedly connected to the left and right position adjustment assembly 32. The right end of the left and right position adjustment assembly 32 is connected to the outer end of the support ring 221.

[0083] The phase position synchronization adjustment assembly 31 includes an adjustment rotating plate 311, an inclined slide groove 312, a straight slide groove 313, a slide rod 314, a sliding tool holder 315, a third motor 316, an arc-shaped adjustment groove 317, a second gear 318, and a second rack 319. The adjustment rotating plate 311 is rotatably connected to the left side wall of the drive rotating plate 41. Several sets of inclined slide grooves 312 are opened at the outer end of the adjustment rotating plate 311. A set of straight slide grooves 313 is opened on the drive rotating plate 41 to the right of the inclined slide grooves 312. A set of sliding tool holders 315 is slidably connected to the drive rotating plate 41 to the right of the straight slide grooves 313. The left side wall of the sliding tool holders 315 is... A slide rod 314 is fixedly connected. The slide rod 314 passes through the straight slide groove 313 and the inclined slide groove 312 and is slidably connected to both the straight slide groove 313 and the inclined slide groove 312. A third motor 316 is fixedly connected to the left side wall of the adjusting plate 311. An arc-shaped adjusting groove 317 is opened on the drive plate 41 to the right of the third motor 316. The output end of the third motor 316 passes through the adjusting plate 311 and is fixedly connected to the second gear 318. A second rack 319 is opened on the inner wall of the arc-shaped adjusting groove 317. The second gear 318 and the second rack 319 are meshed and connected. A cutting tool is fixedly connected to one end of the sliding tool holder 315 near the steel pipe 1.

[0084] The left and right position adjustment component 32 includes a fourth motor 321, a second threaded rod 322, a second threaded sleeve 323, and a limiting guide slide rod 324. The fourth motor 321 is fixedly connected to the outer end of the support ring 221. The output end of the fourth motor 321 is fixedly connected to the second threaded rod 322. The left end of the second threaded rod 322 is inserted into the second threaded sleeve 323 and threadedly connected to the second threaded sleeve 323. The left end of the second threaded sleeve 323 is fixedly connected to the right side wall of the fixed ring 42. Several sets of limiting guide slide rods 324 are fixedly connected to the right side wall of the fixed ring 42. The right ends of the limiting guide slide rods 324 all pass through the outer end of the support ring 221 and are slidably connected to the support ring 221.

[0085] When the inner and outer double fixing components 2 are positioned and fixed, the third motor 316 is started. The output end of the third motor 316 drives the second gear 318 to rotate. Since the drive plate 41 is fixed under the limit of the third gear 44, the second gear 318 drives the adjusting plate 311 to rotate under the limit of the drive plate 41 through the second rack 319 and the arc-shaped adjusting groove 317. The adjusting plate 311 drives the inclined slide groove 312 to rotate, thereby causing the inner wall of the inclined slide groove 312 to press the slide rod 314. As a result, all the slide rods 314 move synchronously back and forth along the trajectory of the straight slide groove 313 under the limit of the straight slide groove 313. This causes the slide rods 314 to drive all the sliding tool holders 315 to move synchronously back and forth along the trajectory of the straight slide groove 313. This causes the sliding tool holders 315 to move the tools synchronously away from or towards the support tube 211, thus realizing... The synchronous adjustment of the distance between each tool allows for the processing of steel pipes 1 of various sizes without the need for individual tool adjustment, saving time and effort while ensuring the accuracy of tool position. When the distance between each tool is adjusted, the fourth motor 321 is started. The output end of the fourth motor 321 drives the second threaded rod 322 to rotate. The second threaded rod 322 drives the second threaded sleeve 323 to move left and right. The second threaded sleeve 323 drives the drive rotating plate 41 to slide left and right under the limit of the support tube 211 through the fixed ring 42. This causes the drive rotating plate 41 to drive the tool to move left and right through the sliding tool holder 315, thereby realizing the adjustment of the left and right position of the tool and thus the adjustment of the distance between the tool and the steel pipe 1. Furthermore, during the processing of the left end of the steel pipe 1, the processing depth of the left end of the steel pipe 1 can be adjusted by adjusting the left and right position of the tool.

[0086] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An end-processing device for high-strength steel pipes, used for processing steel pipes (1), comprising inner and outer double fixing components (2), characterized in that: The left end of the steel pipe (1) is connected to an inner and outer double fixing component (2) that can fix the processing equipment on the steel pipe (1) from both the inner and outer sides of the steel pipe (1). The outer end of the inner and outer double fixing components (2) is connected to a tool position adjustment component (3) that can synchronously adjust the distance between each tool and the steel pipe (1). The left end of the tool position adjustment assembly (3) is connected to a circumferential cutting drive assembly (4) for supporting the tool position adjustment assembly (3) and driving the tool to process the steel pipe (1). The inner and outer double fixing components (2) include an inner opening fixing component (21) and an outer clamping component (22). The inner wall of the left end of the steel pipe (1) is connected to the inner opening fixing component (21), and the outer side of the left end of the steel pipe (1) is connected to the outer clamping component (22). The left end of the inner opening fixing component (21) is rotatably connected to the ring cutting drive component (4), and the outer end of the outer clamping component (22) is connected to the tool position adjustment component (3). The internal expansion and fixing assembly (21) includes a support tube (211), a first motor (212), a first threaded rod (213), a first threaded sleeve (214), a first linkage rod (215), a second linkage rod (216), a support plate (217), and a limiting slide groove (218). The right end of the support tube (211) is inserted into the interior of the steel pipe (1). The first motor (212) is fixedly connected to the left side wall of the support tube (211). The output end of the first motor (212) passes through the left side wall of the support tube (211) and is fixedly connected to the first threaded rod (213). The right end of the first threaded rod (213) is located inside the left end of the first threaded sleeve (214) and is threadedly connected to the first threaded sleeve (214). The left end of the first threaded sleeve (214) is located inside the support tube (211) and is slidably connected to the support tube (211). The right end of the first threaded sleeve (214) is rotatably connected to several sets of first linkage rods (215). Each set of first linkage rods (215) is rotatably connected to the support tube (211) to the left of the support tube (211). The intersection of the first linkage rods (215) and the second linkage rods (216) that are close to each other is rotatably connected by a rotating shaft. The end of the support plate (217) near the first linkage rod (215) and the second linkage rod (216) is provided with a limiting groove (218). The end of the first linkage rod (215) and the second linkage rod (216) near the support plate (217) is slidably connected to the limiting groove (218) by a rotating shaft. The side wall of the support plate (217) away from the support tube (211) is in contact with the inner wall of the steel pipe (1). The left end of the support tube (211) is rotatably connected to a ring cutting drive assembly (4). The external clamping assembly (22) includes a support ring (221), a locking ring (222), a pressing rod (223), a linkage support rod (224), a second motor (225), a first gear (226), and a first rack (227). The left end of the steel pipe (1) passes through the support ring (221) and the locking ring (222). The left end of the support ring (221) is rotatably connected to the locking ring (222). Several sets of pressing rods (223) are rotatably connected to the inner wall of the support ring (221). Several sets of pressing rods (224) are rotatably connected to the inner wall of the locking ring (225). 23) Corresponding linkage support rod (224), the end of linkage support rod (224) near the extrusion rotating rod (223) is rotatably connected to the extrusion rotating rod (223), the outer end of support ring (221) is fixedly connected to the second motor (225), the output end of the second motor (225) is fixedly connected to the first gear (226), the locking ring (222) inside the first gear (226) is fixedly connected to the first rack (227), the first gear (226) and the first rack (227) are meshed; the outer end of support ring (221) is connected to the tool position adjustment assembly (3); The ring cutting drive assembly (4) includes a drive rotating plate (41), a fixed ring (42), a fifth motor (43), a third gear (44), and a third rack (45). The drive rotating plate (41) is movably connected to the outer wall of the support pipe (211) on the left side of the steel pipe (1). The support pipe (211) passes through the drive rotating plate (41). The fixed ring (42) is rotatably connected to the outer side of the drive rotating plate (41). The fifth motor (43) is fixedly connected to the left side wall of the fixed ring (42). The output end of the fifth motor (43) passes through the fixed ring (42) and is fixedly connected to the third gear (44). The third rack (45) is fixedly connected to the outer end of the right side wall of the drive rotating plate (41). The third gear (44) meshes with the third rack (45). The inner end of the drive rotating plate (41) is connected to the tool position adjustment assembly (3). The right end of the fixed ring (42) is fixedly connected to the tool position adjustment assembly (3).

2. The end-processing equipment according to claim 1, characterized in that, The tool position adjustment assembly (3) includes a phase distance position synchronization adjustment assembly (31) and a left and right position adjustment assembly (32). The inner end of the drive plate (41) is connected to the phase distance position synchronization adjustment assembly (31), and the right side wall of the fixed ring (42) is fixedly connected to the left and right position adjustment assembly (32). The right end of the left and right position adjustment assembly (32) is connected to the outer end of the support ring (221).

3. The end-processing equipment according to claim 2, characterized in that, The phase distance synchronization adjustment component (31) includes an adjustment rotating plate (311), an inclined slide groove (312), a straight slide groove (313), a slide rod (314), a sliding tool holder (315), a third motor (316), an arc-shaped adjustment groove (317), a second gear (318), and a second rack (319). The adjustment rotating plate (311) is rotatably connected to the left side wall of the drive rotating plate (41). Several sets of inclined slide grooves (312) are opened at the outer end of the adjustment rotating plate (311). A set of straight slide grooves (313) is opened on the drive rotating plate (41) to the right of the inclined slide grooves (312). A set of sliding tool holders (315) is slidably connected to the drive rotating plate (41) to the right of the straight slide grooves (313). The left side wall of the sliding tool holder (315) A slide rod (314) is fixedly connected to each of the upper parts. The slide rod (314) passes through the straight slide groove (313) and the oblique slide groove (312) and is slidably connected to both the straight slide groove (313) and the oblique slide groove (312). A third motor (316) is fixedly connected to the left side wall of the adjusting plate (311). An arc-shaped adjusting groove (317) is opened on the drive plate (41) to the right of the third motor (316). The output end of the third motor (316) passes through the adjusting plate (311) and is fixedly connected to the second gear (318). A second rack (319) is opened on the inner wall of the arc-shaped adjusting groove (317). The second gear (318) meshes with the second rack (319). A tool is fixedly connected to the end of the sliding tool holder (315) near the steel pipe (1).

4. The end-processing equipment according to claim 3, characterized in that, The left and right position adjustment component (32) includes a fourth motor (321), a second threaded rod (322), a second threaded sleeve (323), and a limiting guide slide rod (324). The fourth motor (321) is fixedly connected to the outer end of the support ring (221). The output end of the fourth motor (321) is fixedly connected to the second threaded rod (322). The left end of the second threaded rod (322) is inserted into the second threaded sleeve (323) and threadedly connected to the second threaded sleeve (323). The left end of the second threaded sleeve (323) is fixedly connected to the right side wall of the fixed ring (42). Several sets of limiting guide slide rods (324) are fixedly connected to the right side wall of the fixed ring (42). The right ends of the limiting guide slide rods (324) all pass through the outer end of the support ring (221) and are slidably connected to the support ring (221).

5. A production process for high-strength steel pipes, employing the end-processing equipment as described in any one of claims 1-4, characterized in that: Includes the following steps: I. Solid cylindrical steel pipe raw materials are selected as steel billets, which include the following components by weight ratio: C: 0.23~0.35%, Cr: 4.83~5.11%, Nb: 0.16~0.21%, Ni: 1.25~1.53%, Mo: 3.56~4.23%, Si: 0.95~1.35%, V: 0.32~0.57%, with the balance being Fe and other unavoidable impurities; 2. Feed the raw steel billet into the cutting device and cut it into cylindrical steel segments of the required length; 3. The steel segment obtained in step 2 is sent into a ring furnace and heated to 1350~1385℃; 4. The product obtained in step 3 is fed into a piercing machine for rod piercing and annealed to 900~935℃, and then held at that temperature for 1.75~2.13h.

5. Anneal the product obtained in step 4 to 715~735℃ and hold for 4 hours; 6. Heat the product obtained in step 5 to 1065~1135℃ for oil quenching, then temper it twice at a temperature of 525~530℃. After tempering, restore it to room temperature and send it to the end processing equipment for end beveling to obtain the required high-strength steel pipe.

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