A high-efficiency welding processing equipment for low-cut-rate seamless pipe
By using rapid welding and forging technology in a low-loss seamless tube high-efficiency welding processing equipment, the problem of tube end thickening defects in seamless tube production has been solved, realizing efficient and short-process seamless tube production and improving production efficiency and yield.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ANSTEEL BEIJING RES INST CO LTD
- Filing Date
- 2025-07-03
- Publication Date
- 2026-06-30
AI Technical Summary
The existing seamless tube production process suffers from end-thickness defects, resulting in high cutting loss rates, which affect production efficiency and yield. Common methods such as end-tip tapering and tension reduction semi-endless/endless rolling have problems such as material waste or poor weld quality.
The equipment uses a low-loss-rate seamless pipe high-efficiency welding processing equipment, and achieves rapid welding and forging of raw pipe through a raw pipe forging device and an induction heating device. Combined with a multi-level control model in the tension reduction process, the pipe end thickening defect is reduced.
It significantly improves weld strength, reduces fractures during welding, increases production efficiency and yield, and is suitable for the production of various alloy seamless tubes, enabling endless rolling and efficient short-process processing.
Smart Images
Figure CN224424883U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of seamless tube technology, and in particular to a high-efficiency welding and processing equipment for seamless tubes with low cutting loss rate. Background Technology
[0002] Pipes can be broadly classified into seamless pipes and welded pipes according to their manufacturing processes. Compared to welded pipes, seamless pipes have advantages such as high strength, high pressure resistance, good corrosion resistance, and long service life, and are widely used in petroleum, natural gas, chemical, shipbuilding, and nuclear power industries. Tension reduction, as the final rolling process in seamless pipe production, plays a decisive role in various indicators such as the shape accuracy, dimensional accuracy, and surface quality of the finished pipe. Due to the inherent characteristics of the tension reduction process and the complexity of the forming process, the pipe ends exhibit unsteady states and insufficient tension, leading to pipe end thickening, which is an inherent defect in the tension reduction process of seamless pipes. The thickness deviations at the beginning and end of the seamless pipe must be removed, with cuts reaching several meters, reducing production capacity and hindering the improvement of yield. To address these issues, commonly used methods include rough pipe tipping, semi-endless / endless rolling during tension reduction, and methods for controlling pipe end thickening during the tension reduction process. Among them, the head-and-tail tipping method mainly involves cutting the ends of the rough tube and then reducing the diameter under tension to improve the product yield. However, this method still consumes a large amount of raw rough tubes, and the process is long with a low tube yield. The tension reduction semi-endless / endless rolling method mainly involves welding the rough tube to achieve semi-endless or endless rolling in the tension reduction process. However, this method is prone to poor weld quality (such as insufficient or many defects) when welding thick-walled tubes, leading to cracking and breakage during rolling, which affects the continuity of production. The tube end thickening control method in the tension reduction process is to adjust the speed of the rolls of each stand to adjust the tension and reduce the occurrence of tube end thickening defects, but the effect is limited. Utility Model Content
[0003] This invention provides a high-efficiency welding and processing equipment for seamless pipes with low shear loss rate. It can achieve endless rolling of tension reduction process using the welded rough pipe, thereby reducing the shear loss rate. The forging process in this invention can effectively break the coarse dendrites formed during the solidification and welding of the metal at the joint of the two rough pipes and play a role in refining the grains, significantly improving the welding strength of the weld and greatly reducing the occurrence of fractures in subsequent processing of thick-walled rough pipes due to defects during welding.
[0004] To achieve the above objectives, the present invention adopts the following technical solution:
[0005] A high-efficiency welding processing equipment for seamless tubes with low cutting loss rate includes a raw tube roller conveyor, a raw tube rear end clamping and extrusion device, a raw tube preheating device, a raw tube forging device, a raw tube front end clamping and positioning device, and a tunnel heating furnace. The raw tube rear end clamping and extrusion device, the raw tube preheating device, the raw tube forging device, the front end clamping and positioning device, and the tunnel heating furnace are arranged sequentially along the traveling direction of the raw tube roller conveyor. The raw tube rear end clamping and extrusion device is located on both sides of the raw tube roller conveyor and uses hydraulic power to achieve radial clamping of the raw tube. The raw tube rear end clamping and extrusion device has a track at its bottom and uses hydraulic power to apply axial extrusion force to the clamped raw tube. The raw tube preheating device is an annular induction heating device. The raw tube forging device is arranged adjacent to the raw tube preheating device. The raw tube forging device has multiple arc-shaped forging dies arranged circumferentially inside. The arc-shaped forging dies are driven to extend and retract by hydraulic power. Multiple front end clamping and positioning devices are located on both sides of the raw tube roller conveyor. The raw tube roller conveyor passes through the tunnel heating furnace.
[0006] Multiple of the aforementioned arc-shaped forging dies are mounted on a circumferential rotating mechanism.
[0007] The clamping end of the raw pipe clamping and extrusion device at the rear end of the raw pipe is L-shaped, with one side of the L-shape parallel to the side of the raw pipe and the other side abutting against the tail end of the raw pipe.
[0008] The bottom of the raw pipe preheating device and the raw pipe forging device are equipped with moving guide rails.
[0009] The bottom of the front end clamping and positioning device for the rough pipe is equipped with a radial moving guide rail.
[0010] A measuring device and a flying saw are also provided at the material inlet of the clamping and extrusion device at the rear end of the rough pipe.
[0011] A high-pressure water descaling machine is installed at the discharge end of the tunnel-type heating furnace, after which the rough tube roller conveyor enters the tension reduction device.
[0012] Compared with the prior art, the beneficial effects of this utility model are:
[0013] 1. This utility model adopts a combination of rapid induction heating, pressure welding at the pipe end, and semi-solid metal forging to achieve efficient and short-process welding between two raw pipes, achieving efficient metallurgical bonding of raw pipes without increasing equipment.
[0014] 2. The forging process in this utility model can effectively break the coarse dendrites formed during the solidification and welding of the metal at the joint of the two rough pipes and play a role in refining the grains, significantly improving the welding strength of the weld, greatly reducing the occurrence of breakage in subsequent processing due to defects in the welding of thick-walled rough pipes, making it easy for industrial continuous large-scale production and greatly improving production efficiency.
[0015] 3. This utility model can realize endless rolling in the tension reduction process using welded rough tubes, fundamentally reducing the tube end thickening defect in the tension reduction process of seamless tubes. Combined with the multi-level control model of tube end thickening in the tension reduction process, it further reduces the tube end thickening defect and significantly improves the tube yield. It is also applicable to the production of seamless tubes of cast iron, steel and other ferrous alloys and aluminum, copper and other non-ferrous alloys produced by tension reduction. It is highly practical and worth promoting. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the structure of this utility model.
[0017] Figure 2 This is a schematic diagram of the structure of the rough tube forging device of this utility model.
[0018] In the diagram: 1-Raw tube after skew rolling and piercing; 2-Raw tube roller conveyor; 3-Measuring device; 4-Flying saw; 5-Rapid welding device; 6-Later rough tube; 7-Raw tube rear end clamping and extrusion device; 8-Railway; 9-Raw tube preheating and forging device; 10-Raw tube preheating device; 11-Raw tube forging device; 12-Moving guide rail; 13-Arc forging die; 14-Circular rotation mechanism; 15-Previous rough tube; 16-Raw tube front end clamping and positioning device; 17-Radial moving guide rail; 18-Tunnel heating furnace; 19-High pressure water descaling machine; 20-Tension diameter reduction device. Detailed Implementation
[0019] The specific implementation of this utility model will be further described below with reference to the embodiments. The following embodiments are used to specifically illustrate the content of this utility model. These embodiments are only general descriptions of the content of this utility model and do not limit the content of this utility model.
[0020] See Figure 1 , Figure 2A high-efficiency welding processing equipment for seamless tubes with low cutting loss rate includes a raw tube roller conveyor 2, a raw tube rear end clamping and extrusion device 7, a raw tube preheating device 10, a raw tube forging device 11, a raw tube front end clamping and positioning device 16, and a tunnel heating furnace 18. The raw tube rear end clamping and extrusion device 7, the raw tube preheating device 10, the raw tube forging device 11, the front end clamping and positioning device 16, and the tunnel heating furnace 18 are arranged sequentially along the traveling direction of the raw tube roller conveyor 2. The raw tube rear end clamping and extrusion device 7 is located on both sides of the raw tube roller conveyor 2 and uses hydraulic power to achieve the diameter of the raw tube. The raw tube is clamped and extruded. The bottom of the rear end clamping and extrusion device 7 is provided with a track 8 and the clamped raw tube is subjected to axial extrusion and pushing force by hydraulic power. The raw tube preheating device 10 is an annular induction heating device. The raw tube forging device 11 is arranged adjacent to the raw tube preheating device 10. The raw tube forging device 11 is provided with multiple arc-shaped forging dies 13 in the inner ring. The arc-shaped forging dies 13 are driven to extend and retract by hydraulic power. Multiple front end clamping and positioning devices 16 are arranged on both sides of the raw tube roller conveyor 2. The raw tube roller conveyor 2 passes through the tunnel heating furnace 18.
[0021] Multiple arc-shaped forging dies 13 are mounted on a circumferential rotating mechanism 14. The arc-shaped forging dies 13 are equipped with hydraulic cylinders to achieve telescopic movement, and hammer the rough tube forging. The circumferential rotating mechanism 14 is driven to rotate by a motor gear, which drives the arc-shaped forging dies 13 to rotate while forging, and to hammer the rough tube evenly in the circumferential direction.
[0022] The raw pipe clamping and extrusion device 7 at the rear end of the raw pipe has an L-shaped clamping end. One side of the L-shape is parallel to and abuts against the side of the raw pipe, and the other side abuts against the tail end of the raw pipe.
[0023] The bottom of the raw tube preheating device 10 and the raw tube forging device 11 is provided with a movable guide rail 12. The movable guide rail 12 is axially arranged.
[0024] The bottom of the front end clamping and positioning device 16 for the rough pipe is provided with a radial moving guide rail 17.
[0025] A measuring device 3 and a flying saw 4 are also provided at the material feeding end of the clamping and extrusion device 7 at the rear end of the rough pipe.
[0026] A high-pressure water descaling machine 19 is provided at the discharge end of the tunnel heating furnace 18, and then the rough tube roller conveyor 2 enters the tension reduction device 20.
[0027] A method for using a high-efficiency welding processing equipment for seamless pipes with low cutting loss rate includes the following specific contents:
[0028] 1) Dimension measurement and tube end cutting: The rough tube 1 after skew rolling and piercing passes through the rough tube roller table 2 and is measured by the measuring device 3 to determine its length, thickness and diameter and other parameters; then the flying saw 4 positions and cuts the axial irregular end of the rough tube 1 after skew rolling and piercing according to the data fed back by the measuring device 3, and then enters the right-side rapid welding device 5 through the rough tube roller table 2.
[0029] 2) Pressure Welding and Forging of Raw Tubes: The rear end clamping and extrusion device 7 and the front end clamping and positioning device 16 of the raw tubes respectively clamp the tail end of the next raw tube 6 and the edge of the previous raw tube 15. The rear end clamping and extrusion device 7 is pushed to make the head end of the next raw tube 6 fit with the tail end of the previous raw tube 15. At the same time, the raw tube preheating device 10 heats the joint to achieve the temperature of the semi-solid zone of the raw tube. Meanwhile, the rear end clamping and extrusion device 7 applies pressure to the joint of the two tubes, and the semi-solid joint... Under the action of extrusion pressure, the solid metal melt moves to both sides to achieve solid-phase welding of the two rough tubes; then the rough tube forging device 11 is moved to the joint of the two tubes, and the metal melt at the joint of the two tubes is forged in its semi-solid temperature range by the rough tube forging device 11, so that the metal diameter at the joint is consistent with the rough tube, and the mechanical properties of the joint of the two tubes are greatly improved; then, the previous rough tube 15 that has been welded enters the tunnel heating furnace 18 for heating, and the above welding action is repeated when the next rough tube enters the equipment.
[0030] 3) Descaling and tension reduction: After welding, the rough tube continues to move through the rough tube roller conveyor 2 to the high-pressure water descaling machine 19 and the tension reduction device 20. The high-pressure water descaling device 19 removes the iron oxide scale formed in the tunnel heating furnace 18. Then, it enters the tension reduction unit equipped with a multi-stage control model for pipe end thickening for multi-stand tension reduction, further reducing the occurrence of pipe end thickening defects. After tension reduction, the finished pipe can be subjected to subsequent online heat treatment and rapid cooling according to product requirements, and finally cut to the required length.
[0031] The measuring device 3 and the flying saw 4 together form a measuring and cutting device, used to measure parameters such as the diameter, wall thickness, and length of the skew-rolled pierced rough tube 1 and to cut the irregular ends of the rough tube along the axial direction. The measuring device 3 is a laser and ultrasonic composite measuring device. The flying saw 4 can position and cut the irregular ends of the rough tube along the axial direction based on the dimensional data fed back by the measuring device 3, ensuring that the ends of the rough tube are radially neat before entering the rapid welding device 5.
[0032] The raw pipe rear end clamping and extrusion device 7, raw pipe preheating device 10, raw pipe forging device 11, raw pipe front end clamping and positioning device 16, and tunnel heating furnace 18 form a rapid welding device 5, which is used to heat and rapidly weld the raw pipe, and forge the weld joint to improve the weld strength. It is set on the right side of the measuring and cutting device, and the discharge port of the measuring and cutting device is kept horizontal with the inlet of the rapid welding device 5.
[0033] The high-pressure water descaling machine 19 and the tension reducing device 20 are used for descaling and tension reducing of the surface of the welded rough pipe. They are located on the right side of the outlet of the rapid welding device 5. The outlet of the rapid welding device 5 is level with the inlet of the high-pressure water descaling machine 19.
[0034] After skew rolling and piercing, the rough tube 1 passes through the rough tube roller table 2 in sequence, followed by a measuring and cutting device, a rapid welding device 5, a high-pressure water descaling machine 19, and a tension reduction device 20.
[0035] The rear end clamping and extrusion device 7 and the front end clamping and positioning device 16 of the raw tube are respectively installed on both sides of the following raw tube 6 and the preceding raw tube 15. The rear end clamping and extrusion device 7 uses a hydraulic cylinder to provide clamping power. The raw tube clamping end of the hydraulic cylinder is L-shaped, with one side of the L-shape parallel to the side of the raw tube and the other side abutting against the end of the raw tube. The track 8 consists of a radial track and an axial track. The hydraulic cylinder is installed on the radial track to adjust the radial distance between the hydraulic cylinder and the raw tube. The radial track is installed on the axial track and moves on the axial track by being powered by another hydraulic cylinder, which can apply an axial extrusion force to the raw tube.
[0036] The front end clamping and positioning device 16 of the raw pipe can move radially along the raw pipe on the radial moving guide rail 17. Its position and clamping distance can be dynamically adjusted according to the feedback data of the measuring device. The front end clamping and positioning device 16 of the raw pipe also uses a hydraulic cylinder to provide clamping power.
[0037] The length of the tunnel heating furnace 18 can be set according to the length of the rough tube, but should be greater than twice the length of the rough tube. It can be used to heat the rough tube before tension reduction after welding.
[0038] The high-pressure water descaling device 10 is used to remove the iron oxide scale formed in the tunnel heating furnace 18 of the raw pipe; the tension reducing unit 20 adopts a multi-stage control model for pipe end thickening during the tension reducing process to further reduce the occurrence of pipe end thickening defects.
[0039] The track 8 at the bottom of the raw tube rear end clamping and extrusion device 7, the radial moving guide rail 17 at the bottom of the raw tube front end clamping and positioning device 16, and the moving guide rail 12 at the bottom of the raw tube preheating and forging device 9 are connected as one unit. The track is set so that the raw tube rear end clamping and extrusion device 7, the raw tube front end clamping and positioning device 16, and the raw tube preheating and forging device 9 can move horizontally synchronously with the raw tube during the welding and forging process, and complete the welding and forging before entering the tunnel heating furnace 18.
[0040] After the rear end clamping and extrusion device 7, the front end clamping and positioning device 16, and the preheating and forging device 9 of the raw tube return to their original positions, subsequent pressure welding and forging operations of the raw tubes can be carried out continuously. This achieves efficient metallurgical bonding of multiple raw tubes in a short process without increasing equipment. At the same time, the forging process can effectively break the coarse dendrites formed during the solidification and welding of the metal at the joint of the two raw tubes and play a role in refining the grains, significantly improving the welding strength of the raw tube joint. This eliminates the conventional and cumbersome ring welding process and avoids the situation where large-walled raw tubes break during subsequent processing due to defects in the welding process, resulting in production stoppages for maintenance, thus greatly improving production efficiency.
[0041] The welded rough tube can be rolled without end during the tension reduction process, which fundamentally reduces the end thickening defect in the tension reduction process of seamless tubes. Combined with the multi-level control model for end thickening during the tension reduction process, the end thickening defect is further reduced, and the tube yield is significantly improved.
[0042] Compared with the currently commonly used methods of tapering the ends of rough tubes and welding them, this method has outstanding advantages in terms of high efficiency and short process. It is also applicable to the production of seamless tubes made of ferrous alloys such as cast iron and steel, as well as non-ferrous alloys such as aluminum and copper, produced by tension reduction. It is highly practical and worth promoting.
[0043] Example 1:
[0044] The specific parameters of the embodiment are as follows: the raw pipe is oil pipe material for oil transportation, the steel grade is N80, the outer diameter is 150mm, the wall thickness is 15mm, the length is 6m, and the length of the tunnel heating furnace is 15m.
[0045] The equipment operation process is as follows:
[0046] 1) Dimension measurement and tube end cutting: The rough tube 1 after skew rolling and piercing passes through the rough tube roller table 2 and is measured by the measuring device 3 to determine its length, thickness and diameter and other parameters; then the flying saw 4 positions and cuts the axial irregular end of the rough tube 1 after skew rolling and piercing according to the data fed back by the measuring device 3, and then enters the right-side rapid welding device 5 through the rough tube roller table 2.
[0047] 2) Pressure welding and forging of raw tubes: When the raw tubes reach the welding position, the raw tube rear end clamping and extrusion device 7, the raw tube front end clamping and positioning device 16, and the raw tube preheating and forging device 9 in the rapid welding device 5 move synchronously with the raw tube roller conveyor 2. Simultaneously, the rear end clamping and extrusion device 7 and the front end clamping and positioning device 16 of the raw tubes clamp the tail of the next raw tube 6 and the edge of the previous raw tube 15, respectively. The rear end clamping and extrusion device 7 is pushed forward, so that the head end of the next raw tube 6 is attached to the tail end of the previous raw tube 15. At the same time, the rapid preheating device 10 of the raw tube equipped in the rapid welding device 5 is used to rapidly heat the joint to a temperature of 1250-1350℃. Meanwhile, by adjusting the forward movement of the rear end clamping and extrusion device 7, the next raw tube 6 is accelerated forward, applying pressure to the joint of the two tubes. The semi-solid molten metal at the joint moves to both sides under the extrusion pressure, realizing rapid solid-state welding of the two raw tubes. Afterwards, the raw tube forging device 11 is moved to the weld position to forge the molten metal at the joint of the two tubes. The process involves striking the metal at the joint to make it radially aligned with the next rough tube 6 and the previous rough tube 15, significantly improving the mechanical properties of the joint. After the above process is completed, the rear end clamping and extrusion device 7 and the front end clamping and positioning device 16 of the rough tube are opened, and the rough tube preheating and forging device 9 is returned to its initial position. The above actions are repeated when the next rough tube enters the equipment. Subsequently, the previous rough tube 15, after welding, enters the tunnel heating furnace 18 and is heated and kept warm before tension reduction while moving towards the descaling and tension reduction device on the right. The holding temperature is 980°C. In addition, when the rough tube preheating and forging device 9 applies pressure to weld and forge the next rough tube 6 and the previous rough tube 15, its speed should match the forward speed of the rough tube and complete the welding and forging before entering the tunnel heating furnace 18.
[0048] Descaling and tension reduction: After welding, the rough tube continues to move to the right side of the descaling and tension reduction device via the rough tube roller conveyor 2. After removing the iron oxide scale formed in the tunnel heating furnace 18 by the high-pressure water descaling device 19, it enters the tension reduction unit equipped with a multi-stage control model for tube end thickening for multi-stand tension reduction, further reducing the occurrence of tube end thickening defects. After tension reduction, the finished tube can be subjected to subsequent online heat treatment and rapid cooling according to product requirements, and finally cut into 8m long finished tubes.
[0049] Specifically, after the rear end clamping and extrusion device 7, the front end clamping and positioning device 16, and the preheating and forging device 9 of the raw tube return to their original positions, subsequent pressure welding and forging operations of the raw tubes can be continuously carried out. This achieves efficient metallurgical bonding of multiple raw tubes in a short process without increasing equipment requirements. Simultaneously, the forging process effectively breaks down the coarse dendrites formed during the solidification and welding of the metal at the joint of the two raw tubes and refines the grains, significantly improving the welding strength of the raw tube joint. This eliminates the need for the conventional and cumbersome annular welding process and prevents the large-walled raw tubes from breaking during subsequent processing due to defects in the welding process. The shutdown for maintenance significantly improves production efficiency; the welded rough tubes can achieve endless rolling in the tension reduction process, fundamentally reducing the end thickening defect in the tension reduction process of seamless tubes. Combined with the multi-level control model for end thickening in the tension reduction process, the end thickening defect is further reduced, significantly improving the tube yield. Compared with the currently commonly used rough tube tipping and welding methods, this method has outstanding high efficiency and short process characteristics. It is also applicable to the production of seamless tubes made of ferrous alloys such as cast iron and steel, as well as non-ferrous alloys such as aluminum and copper, produced by tension reduction. It is highly practical and worth promoting.
[0050] The above-disclosed embodiments are merely specific examples of this utility model. However, the embodiments of this utility model are not limited thereto, and any variations that can be conceived by those skilled in the art should fall within the protection scope of this utility model.
Claims
1. A low-cut-rate seamless pipe high-efficiency welding processing device, characterized in that, The system includes a raw tube roller conveyor, a raw tube rear end clamping and extrusion device, a raw tube preheating device, a raw tube forging device, a raw tube front end clamping and positioning device, and a tunnel-type heating furnace. The raw tube rear end clamping and extrusion device, the raw tube preheating device, the raw tube forging device, the front end clamping and positioning device, and the tunnel-type heating furnace are arranged sequentially along the traveling direction of the raw tube roller conveyor. The raw tube rear end clamping and extrusion device is located on both sides of the raw tube roller conveyor and uses hydraulic power to achieve radial clamping of the raw tube. The raw tube rear end clamping and extrusion device has a track at its bottom and uses hydraulic power to apply axial extrusion and pushing force to the clamped raw tube. The raw tube preheating device is an annular induction heating device. The raw tube forging device is arranged adjacent to the raw tube preheating device. The raw tube forging device has multiple arc-shaped forging dies arranged circumferentially inside. The arc-shaped forging dies are driven to extend and retract by hydraulic power. Multiple front end clamping and positioning devices are located on both sides of the raw tube roller conveyor. The raw tube roller conveyor passes through the tunnel-type heating furnace.
2. The low-loss-rate, high-efficiency welding equipment for seamless pipes according to claim 1, characterized in that, Multiple of the aforementioned arc-shaped forging dies are mounted on a circumferential rotating mechanism.
3. The low-loss-rate, high-efficiency welding equipment for seamless pipes according to claim 1, characterized in that, The clamping end of the raw pipe clamping and extrusion device at the rear end of the raw pipe is L-shaped, with one side of the L-shape parallel to the side of the raw pipe and the other side abutting against the tail end of the raw pipe.
4. The low-loss-rate, high-efficiency welding equipment for seamless pipes according to claim 1, characterized in that, The bottom of the raw pipe preheating device and the raw pipe forging device are equipped with moving guide rails.
5. The low-loss-rate, high-efficiency welding equipment for seamless pipes according to claim 1, characterized in that, The bottom of the front end clamping and positioning device for the rough pipe is equipped with a radial moving guide rail.
6. The low-loss-rate, high-efficiency welding equipment for seamless pipes according to claim 1, characterized in that, A measuring device and a flying saw are also provided at the material inlet of the clamping and extrusion device at the rear end of the rough pipe.
7. The low-loss-rate, high-efficiency welding equipment for seamless pipes according to claim 1, characterized in that, A high-pressure water descaling machine is installed at the discharge end of the tunnel-type heating furnace, after which the rough tube roller conveyor enters the tension reduction device.