High-efficiency welding processing equipment for seamless tube with low cutting loss rate and use method of high-efficiency welding processing equipment

Abstract

The invention discloses low-cutting-loss-rate seamless pipe efficient welding machining equipment and a using method. The equipment comprises a pierced billet roller bed, a pierced billet rear end clamping and extruding device, a pierced billet preheating device, a pierced billet forging device, a pierced billet front end clamping and positioning device and a tunnel type heating furnace. The pierced billet rear end clamping and extruding devices are arranged on the two sides of the pierced billet roller way, radial clamping of pierced billets is achieved through hydraulic power, rails are arranged at the bottoms of the pierced billet rear end clamping and extruding devices, axial extruding and pushing force is applied to the clamped pierced billets through hydraulic power, and the pierced billet preheating device is an annular induction heating device. A plurality of arc-shaped forging dies are annularly arranged in the pierced billet forging device, the front end clamping and positioning devices are arranged on the two sides of the pierced billet roller way, and the pierced billet roller way penetrates through the tunnel type heating furnace. According to the method, the welded pierced billet can be used for achieving endless rolling in the tension reducing process, and the cutting loss rate is reduced. According to the forging process, the welding strength of a welding seam can be remarkably improved, and the breakage condition of a large-wall-thickness pierced billet in the machining process is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of seamless pipes, and in particular to a high-efficiency welding processing device for seamless pipes with a low cutting loss rate and a use method thereof. Background Art

[0002] Pipes can be roughly divided into seamless pipes and welded pipes according to the manufacturing process. Compared with welded pipes, seamless pipes have the characteristics of high strength, strong pressure resistance, good corrosion resistance, and long service life. They are widely used in the fields of petroleum, natural gas, chemical industry, shipbuilding, nuclear power, etc. Stretch reducing, as the final rolling process in the production of seamless pipes, plays a decisive role in various measurement indicators such as the shape accuracy, dimensional accuracy, and surface quality of the finished pipes. Due to the characteristics of the stretch reducing process itself and the complexity of the forming process, the non-steady state and insufficient tension at the pipe end cause the thickening of the finished pipe end, which is an inherent defect in the stretch reducing process of seamless pipes. The thickness tolerance part of the seamless pipe at the head and tail needs to be cut off, and the cutting loss at the head and tail is as high as several meters, which reduces production capacity and restricts the improvement of the yield rate. To address the above problems, the commonly used methods currently include the rough pipe head and tail sharpening method, tension reducing semi-headless / headless rolling, and the pipe end thickening control method during the tension reducing process. Among them, the head and tail sharpening method mainly cuts the heads and tails of the rough pipe and then performs tension reducing to improve the product yield. However, this method still requires the loss of a large amount of raw rough pipe, and the process flow is long, and the pipe yield is low; the tension reducing semi-headless / headless rolling method mainly welds the rough pipe to achieve semi-headless or headless rolling in the tension reducing process. However, this method is prone to poor weld quality (such as insufficient and many defects) when welding thick-walled pipes, resulting in cracking, and breakage during the rolling process, affecting production continuity; the method for controlling the thickening of the pipe end during the tension reducing process is to adjust the rotation speed of the rollers of each frame during the tension reducing process to adjust the tension and reduce the occurrence of thickening defects at the pipe end, but the effect is limited. Summary of the Invention

[0003] The present invention provides a highly efficient welding and processing device for seamless pipes with a low shear loss rate and its use method. This device can utilize welded rough pipes for endless rolling during tension reduction, thereby reducing shear loss. The forging process in this invention effectively breaks up coarse dendrites formed during metal solidification welding at the joint between the two rough pipes and refines the grain size, significantly improving weld strength and significantly reducing the risk of fracture during subsequent processing of thick rough pipes due to defects during welding.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A high-efficiency welding processing equipment for seamless pipes with a low cutting loss rate comprises a raw pipe roller, a raw pipe rear end clamping and extruding device, a raw pipe preheating device, a raw pipe forging device, a raw pipe front end clamping and positioning device, and a tunnel-type heating furnace. The raw pipe rear end clamping and extruding device, the raw pipe preheating device, the raw pipe forging device, the front end clamping and positioning device, and the tunnel-type heating furnace are arranged in sequence along the traveling direction of the raw pipe roller. The raw pipe rear end clamping and extruding device is arranged on both sides of the raw pipe roller and radially clamps the raw pipe through hydraulic power. A track is provided at the bottom of the raw pipe rear end clamping and extruding device and applies axial extrusion driving force to the clamped raw pipe through hydraulic power. The raw pipe preheating device is an annular induction heating device. The raw pipe forging device is arranged adjacent to the raw pipe preheating device. A plurality of arc-shaped forging dies are circumferentially arranged inside the raw pipe forging device. The arc-shaped forging dies are driven to extend and retract by hydraulic power. A plurality of the front end clamping and positioning devices are arranged on both sides of the raw pipe roller. The raw pipe roller passes through the tunnel-type heating furnace.

[0006] A plurality of arc-shaped forging dies are installed on a circumferential rotating mechanism.

[0007] The rough pipe clamping end of the rough pipe rear end clamping and extrusion device is L-shaped, one side of the L-shaped side is parallel to the side of the rough pipe, and the other side is against the rear end of the rough pipe.

[0008] The bottoms of the rough pipe preheating device and the rough pipe forging device are provided with movable guide rails.

[0009] A radial movable guide rail is provided at the bottom of the rough pipe front end clamping and positioning device.

[0010] A measuring device and a flying saw are also provided at the material inlet end of the clamping and extruding device at the rear end of the rough pipe.

[0011] A high-pressure water dephosphorization machine is provided at the discharge end of the tunnel-type heating furnace, after which the rough pipe roller conveyor enters the tension reducing device.

[0012] A method for using a low-cutting-loss-rate seamless pipe high-efficiency welding processing device includes the following specific contents:

[0013] 1) Dimension measurement and pipe end cutting: After oblique rolling and piercing, the rough pipe passes through the rough pipe roller and the measuring device to measure its length, thickness, diameter and other parameters; then the flying saw locates and cuts the axial irregular end of the rough pipe after oblique rolling and piercing according to the data fed back by the measuring device, and then passes through the rough pipe roller to enter the right-hand rapid welding device.

[0014] 2) Pressurized welding and forging of rough pipes: The rear-end clamping and extruding device and the front-end clamping and positioning device of the rough pipe are respectively clamped to the rear end of the subsequent rough pipe and the edge of the previous rough pipe. The rear-end clamping and extruding device of the rough pipe is pushed to make the head end of the subsequent rough pipe fit with the tail end of the previous rough pipe. At the same time, the rough pipe preheating device is used to heat the fitting area to the semi-solid range of the rough pipe. At the same time, the rear-end clamping and extruding device of the rough pipe applies pressure to the fitting area of ​​the two pipes. The semi-solid metal melt at the fitting area moves to both sides under the action of the extrusion force, achieving solid-phase welding of the two rough pipes. The rough pipe forging device is then moved to the fitting area of ​​the two pipes. The metal melt at the fitting area of ​​the two pipes is forged by the rough pipe forging device within its semi-solid temperature range, so that the metal diameter at the fitting area is consistent with that of the rough pipe and the mechanical properties of the fitting area of ​​the two pipes are significantly improved. Subsequently, the previous rough pipe that has been welded enters the tunnel heating furnace for heating, and the aforementioned welding operation is repeated when the next rough pipe enters the equipment.

[0015] 3) Dephosphorization and Stretch Reducing: After welding, the rough pipe continues to move to the high-pressure water dephosphorization machine and stretch reducing device via the rough pipe roller. After the high-pressure water dephosphorization device removes the iron oxide scale formed on the rough pipe in the tunnel heating furnace, it enters the stretch reducing unit equipped with a multi-stage control model for pipe end thickening to carry out multi-stand stretch reducing, further reducing the occurrence of pipe end thickening defects. After the stretch reducing is completed, the finished pipe can undergo subsequent online heat treatment and rapid cooling according to product requirements, and finally be cut into the required length of the product.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The present invention adopts a method combining rapid induction heating, pipe end pressure welding and metal semi-solid forging to achieve efficient and short-process welding between two rough pipes, and realizes efficient metallurgical bonding of rough pipes without increasing equipment.

[0018] 2. The forging process in the present invention can effectively break up the coarse dendrites formed during the metal solidification welding process 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 the subsequent processing due to defects in the welding process of thick-walled rough pipes. It is easy to industrialize continuous large-scale production and greatly improve production efficiency.

[0019] 3. The present invention can utilize the welded rough pipe to realize headless rolling during the tension reducing process, thereby fundamentally reducing the pipe end thickening defect during the tension reducing process of the seamless pipe. In combination with the multi-stage control model of the pipe end thickening during the tension reducing process, the pipe end thickening defect is further reduced, and the pipe yield rate is significantly improved. The present invention is also suitable for the production of seamless pipes of ferrous alloys such as cast iron and steel and non-ferrous alloys such as aluminum and copper produced by tension reducing. It has strong practicality and is worthy of promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the present invention.

[0021] Figure 2 It is a structural schematic diagram of the rough pipe forging device of the present invention.

[0022] In the figure: 1-the rough pipe after oblique rolling and perforation; 2-the rough pipe roller; 3-the measuring device; 4-the flying saw; 5-the rapid welding device; 6-the last rough pipe; 7-the device for clamping and extruding the rear end of the rough pipe; 8-the track; 9-the rough pipe preheating and forging device; 10-the rough pipe preheating device; 11-the rough pipe forging device; 12-the moving guide rail; 13-the arc forging die; 14-the circumferential rotating mechanism; 15-the last rough pipe; 16-the device for clamping and positioning the front end of the rough pipe; 17-the radial moving guide rail; 18-the tunnel heating furnace; 19-the high-pressure water dephosphorization machine; 20-the tension reducing device. DETAILED DESCRIPTION

[0023] The specific embodiments of the present invention will be further described below in conjunction with examples. The following examples are used to specifically illustrate the content of the present invention. These examples are only general descriptions of the content of the present invention and do not limit the content of the present invention.

[0024] See Figure 1 、 Figure 2 A high-efficiency welding processing equipment for seamless pipes with low shear loss rate, comprising a raw pipe roller 2, a raw pipe rear end clamping and extruding device 7, a raw pipe preheating device 10, a raw pipe forging device 11, a raw pipe front end clamping and positioning device 16 and a tunnel-type heating furnace 18. The raw pipe rear end clamping and extruding device 7, the raw pipe preheating device 10, the raw pipe forging device 11, the front end clamping and positioning device 16 and the tunnel-type heating furnace 18 are arranged in sequence along the direction of travel of the raw pipe roller 2. The raw pipe rear end clamping and extruding device 7 is arranged on both sides of the raw pipe roller 2 and realizes the diameter adjustment of the raw pipe by hydraulic power. The rough pipe rear end clamping and extrusion device 7 is provided with a track 8 at the bottom and applies axial extrusion force to the clamped rough pipe through hydraulic power. The rough pipe preheating device 10 is an annular induction heating device. The rough pipe forging device 11 is arranged adjacent to the rough pipe preheating device 10. A plurality of arc-shaped forging dies 13 are arranged in an annular direction inside the rough pipe forging device 11. The arc-shaped forging dies 13 are driven to retract by hydraulic power. A plurality of the front end clamping and positioning devices 16 are arranged on both sides of the rough pipe roller 2, and the rough pipe roller 2 passes through a tunnel-type heating furnace 18.

[0025] The plurality of 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, hammering the rough pipe. The circumferential rotating mechanism 14 is driven by a motor gear, driving the arc-shaped forging dies 13 to rotate while forging, hammering the rough pipe evenly along its circumference.

[0026] The rough pipe clamping end of the rough pipe rear end clamping and extruding device 7 is L-shaped, one side of the L-shaped side is parallel to the side of the rough pipe, and the other side is against the rear end of the rough pipe.

[0027] The bottom of the rough pipe preheating device 10 and the rough pipe forging device 11 is provided with a movable guide rail 12. The movable guide rail 12 is arranged axially.

[0028] A radial moving guide rail 17 is provided at the bottom of the rough pipe front end clamping and positioning device 16 .

[0029] A measuring device 3 and a flying saw 4 are also provided at the material inlet end of the clamping and extruding device 7 at the rear end of the rough pipe.

[0030] A high-pressure water dephosphorization machine 19 is provided at the discharge end of the tunnel-type heating furnace 18 , after which the rough pipe roller conveyor 2 enters the tension reducing device 20 .

[0031] A method for using a low-cutting-loss-rate seamless pipe high-efficiency welding processing device includes the following specific contents:

[0032] 1) Dimension measurement and pipe end cutting: After oblique rolling and piercing, the rough pipe 1 passes through the rough pipe roller 2 and the measuring device 3 to measure its length, thickness, diameter and other parameters; then the flying saw 4 locates and cuts the axial irregular end of the rough pipe 1 after oblique rolling and piercing according to the data fed back by the measuring device 3, and then passes through the rough pipe roller 2 to enter the right-hand rapid welding device 5.

[0033] 2) Pressurized welding and forging of rough pipes: The rear end clamping and squeezing device 7 of the rough pipe and the front end clamping and positioning device 16 of the rough pipe are used to clamp the tail of the next rough pipe 6 and the edge of the previous rough pipe 15 respectively, and the rear end clamping and squeezing device 7 of the rough pipe is pushed to make the head end of the next rough pipe 6 fit with the tail end of the previous rough pipe 15; at the same time, the rough pipe preheating device 10 is used to heat the fitting part to achieve the temperature reaching the semi-solid range of the rough pipe, and at the same time, the rear end clamping and squeezing device 7 of the rough pipe is used to give pressure to the fitting part of the two pipes, and the semi-solid range of the fitting part is formed. The solid metal melt moves to both sides under the action of the extrusion force, realizing the solid-phase welding of the two rough pipes. Then, the rough pipe forging device 11 is moved to the joint of the two pipes, and the rough pipe forging device 11 is used to forge the metal melt at the joint of the two pipes in its semi-solid temperature range, so that the metal diameter at the joint is consistent with that of the rough pipe, and the mechanical properties of the joint of the two pipes are greatly improved. Subsequently, the rough pipe 15 that has completed the welding enters the tunnel heating furnace 18 for heating, and the above-mentioned welding action is repeated when the next rough pipe enters the equipment.

[0034] 3) Dephosphorization and Stretch Reducing: After welding, the rough pipe continues to move to the high-pressure water dephosphorization machine 19 and the stretch reducing device 20 via the rough pipe roller 2. After the high-pressure water dephosphorization device 19 removes the iron oxide scale formed on the rough pipe in the tunnel heating furnace 18, it enters the stretch reducing unit equipped with a multi-stage control model for pipe end thickening to carry out multi-stand stretch reducing, further reducing the occurrence of pipe end thickening defects. After the stretch reducing is completed, the finished pipe can be subjected to subsequent online heat treatment and rapid cooling according to product requirements, and finally cut into the required length of the product.

[0035] Measuring device 3 and flying saw 4 form a measuring and cutting device, used to measure parameters such as diameter, wall thickness, and length of the obliquely rolled and perforated rough pipe 1 and to cut any axially irregular ends of the rough pipe. Measuring device 3 is a combined laser and ultrasonic measuring device, and flying saw 4 locates and cuts any axially irregular ends of the rough pipe based on the dimensional data fed back by measuring device 3, ensuring radial alignment of the rough pipe ends before entering the rapid welding device 5.

[0036] The rough pipe rear end clamping and extrusion device 7, the rough pipe preheating device 10, the rough pipe forging device 11, the rough pipe front end clamping and positioning device 16 and the tunnel heating furnace 18 constitute the rapid welding device 5, which is used to achieve heating and rapid welding of the rough pipe, and forge the weld to improve the weld strength. It is arranged to the right of the measuring and cutting device, and the discharge port of the measuring and cutting device is kept horizontal with the feed port of the rapid welding device 5.

[0037] The high-pressure water dephosphorization machine 19 and the tension reducing device 20 are used for dephosphorization and tension reducing of the welded rough pipe surface. They are arranged on the right side of the outlet of the quick welding device 5. The discharge port of the quick welding device 5 is kept horizontal with the feed port of the high-pressure water dephosphorization machine 19.

[0038] After the oblique rolling and piercing, the rough pipe 1 passes through the rough pipe roller 2 and sequentially passes through the measuring and cutting device, the rapid welding device 5, the high-pressure water dephosphorization machine 19, and the tension reducing device 20.

[0039] The rear-end clamping and squeezing device 7 and the front-end clamping and positioning device 16 for the rough pipe are located on either side of the rear rough pipe 6 and the front rough pipe 15, respectively. The rear-end clamping and squeezing device 7 uses a hydraulic cylinder to provide the clamping force. The rough pipe clamping end of the hydraulic cylinder is L-shaped, with one side of the L resting parallel to the side of the rough pipe and the other side resting against the end of the rough pipe. The track 8 consists of a radial track and an axial track. The hydraulic cylinder is mounted on the radial track to adjust the radial distance between the hydraulic cylinder and the rough pipe. The radial track is mounted on the axial track and is powered by another hydraulic cylinder to move along the axial track, applying an axial squeezing force to the rough pipe.

[0040] The front end clamping and positioning device 16 of the rough pipe can move radially along the rough pipe on the radial moving guide rail 17, and can dynamically adjust its position and clamping distance according to the feedback data of the measuring device. The front end clamping and positioning device 16 of the rough pipe also uses a hydraulic cylinder to provide clamping power.

[0041] The length of the tunnel heating furnace 18 can be set according to the length of the rough pipe, but should be greater than twice the length of the rough pipe, and can be used to heat the rough pipe after welding before tension reduction.

[0042] The high-pressure water dephosphorization device 10 is used to remove the iron oxide scale formed on the rough pipe in the tunnel heating furnace 18; the stretch reducing unit 20 adopts a multi-stage control model for pipe end thickening during the stretch reducing process to further reduce the occurrence of pipe end thickening defects.

[0043] The track 8 at the bottom of the rough pipe rear end clamping and extrusion device 7, the radial movable guide rail 17 at the bottom of the rough pipe front end clamping and positioning device 16, and the movable guide rail 12 at the bottom of the rough pipe preheating and forging device 9 are connected as a whole. The track is set to enable the rough pipe rear end clamping and extrusion device 7, the rough pipe front end clamping and positioning device 16, and the rough pipe preheating and forging device 9 to move horizontally synchronously with the rough pipe during the welding and forging process, and complete the welding and forging before entering the tunnel heating furnace 18.

[0044] After the rough pipe rear end clamping and extrusion device 7, the rough pipe front end clamping and positioning device 16 and the rough pipe preheating and forging device 9 return to their original positions, the subsequent rough pipe pressurization welding and forging operations can be carried out continuously, and efficient metallurgical bonding of multiple rough pipes can be achieved in a short process without increasing equipment; at the same time, the forging process can effectively break up the coarse dendrites formed during the metal solidification welding process at the joint of the two rough pipes and play a role in refining the grains, significantly improving the welding strength of the rough pipe joint, eliminating the conventional cumbersome ring welding process, and avoiding the situation where the thick-walled rough pipe breaks during the subsequent processing due to defects in the welding process and is shut down for maintenance, thereby greatly improving production efficiency.

[0045] The welded rough pipe can achieve endless rolling during the tension reducing process, fundamentally reducing the pipe end thickening defect during the tension reducing process of the seamless pipe. Combined with the multi-level control model of pipe end thickening during the tension reducing process, the pipe end thickening defect can be further reduced and the pipe yield can be significantly improved.

[0046] Compared with the currently commonly used methods of sharpening the ends and welding of rough pipes, this method has outstanding high efficiency and short process characteristics, and is also suitable for the production of seamless pipes 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 worthy of promotion.

[0047] Example 1:

[0048] The specific parameters of the embodiment are: the rough pipe is a pipe material for oil transportation, the steel grade is N80, the outer diameter is 150 mm, the wall thickness is 15 mm, the length is 6 m, and the length of the tunnel heating furnace is 15 m.

[0049] The equipment operation process is as follows:

[0050] 1) Dimension measurement and pipe end cutting: After oblique rolling and perforation, the rough pipe 1 passes through the rough pipe roller 2 and the measuring device 3 to measure its length, thickness, diameter and other parameters. Then, the flying saw 4 locates and cuts the axial irregular end of the rough pipe 1 after oblique rolling and perforation based on the data fed back by the measuring device 3. The rough pipe then passes through the rough pipe roller 2 and enters the right-hand rapid welding device 5.

[0051] 2) Pressurized welding and forging of the rough pipe: When the rough pipe reaches the welding position, the rough pipe rear end clamping and extrusion device 7, the rough pipe front end clamping and positioning device 16 and the rough pipe preheating and forging device 9 in the rapid welding device 5 move synchronously with the rough pipe roller 2. At the same time, the rear end clamping and extruding device 7 of the rough pipe and the front end clamping and positioning device 16 of the rough pipe are respectively used to clamp the tail of the rear rough pipe 6 and the edge of the front rough pipe 15, and the rear end clamping and extruding device 7 of the rough pipe is pushed forward to make the head end of the rear rough pipe 6 fit with the tail end of the front rough pipe 15; at the same time, the rough pipe rapid preheating device 10 equipped in the rapid welding device 5 is used to quickly heat the joint to achieve a temperature of 1250-1350°C. At the same time, by adjusting the rear end clamping and extruding device 7 of the rough pipe to move forward, the rear rough pipe 6 is accelerated forward, and pressure is applied to the joint of the two pipes. The semi-solid metal melt at the joint moves to both sides under the action of the extrusion force, thereby realizing rapid solid-phase welding of the two rough pipes; thereafter, the rough pipe forging device 11 is moved to the weld position to forge the metal melt at the joint of the two pipes Beat so that the metal at the joint is radially flush with the rear rough pipe 6 and the front rough pipe 15, and the mechanical properties of the joint between the two pipes are greatly improved; after the above process is completed, the rough pipe rear end clamping and extrusion device 7 and the rough pipe front end clamping and positioning device 16 are opened, and the rough pipe preheating and forging device 9 returns to the initial position; and the above action is repeated when the next rough pipe enters the equipment; then, the front rough pipe 15 after welding is completed enters the tunnel heating furnace 18, and while advancing to the right side dephosphorization and tension reducing device, heating and insulation before tension reducing are carried out, and the insulation temperature is 980°C; in addition, when the rough pipe preheating and forging device 9 pressurizes the rear rough pipe 6 and the front rough pipe 15 for welding and forging, its speed should match the forward speed of the rough pipe, and welding and forging are completed before entering the tunnel heating furnace 18.

[0052] Phosphorus removal and stretch reducing: After welding, the rough pipe continues to move to the right side of the dephosphorization and stretch reducing device through the rough pipe roller 2. After the iron oxide scale formed on the rough pipe in the tunnel heating furnace 18 is removed by the high-pressure water dephosphorization device 19, it enters the stretch reducing unit equipped with a multi-stage control model for pipe end thickening to carry out multi-rack stretch reducing, further reducing the occurrence of pipe end thickening defects; after the stretch reducing is completed, the finished pipe can be subjected to subsequent online heat treatment and rapid cooling according to product requirements, and finally cut into 8m long finished pipes.

[0053] Specifically, after the rough pipe rear end clamping and extrusion device 7, the rough pipe front end clamping and positioning device 16 and the rough pipe preheating and forging device 9 return to their original positions, the subsequent rough pipe pressurization welding and forging operations can be continuously carried out, and the efficient metallurgical bonding of multiple rough pipes can be achieved in a short process without increasing equipment; at the same time, the forging process can effectively break the coarse dendrites formed during the metal solidification welding process at the joint of the two rough pipes and play a role in refining the grains, significantly improving the welding strength of the rough pipe joint, eliminating the conventional tedious ring welding process, and avoiding the large-walled thick rough pipe from breaking in the subsequent processing due to defects in the welding process The production stoppage and maintenance situation can be avoided, which greatly improves production efficiency; the welded rough pipe can realize headless rolling in the process of tension reducing, fundamentally reducing the pipe end thickening defect in the process of tension reducing of seamless pipe, and combining with the multi-level control model of pipe end thickening in the process of tension reducing, further reducing the pipe end thickening defect, and significantly improving the pipe yield; compared with the currently commonly used rough pipe end sharpening and rough pipe welding methods, this method has outstanding high efficiency and short process characteristics, and is also suitable for the production of seamless pipes of cast iron, steel and other ferrous alloys and aluminum, copper and other non-ferrous alloys produced by tension reducing, with strong practicality and worthy of promotion.

[0054] The above disclosure is only a specific embodiment of the present invention. However, the embodiments of the present invention are not limited thereto. Any changes that can be conceived by those skilled in the art should fall within the scope of protection of the present invention.

Claims

1. A high-efficiency welding processing equipment for seamless pipes with low cutting loss rate, characterized in that: The present invention comprises a rough pipe roller, a rough pipe rear end clamping and extruding device, a rough pipe preheating device, a rough pipe forging device, a rough pipe front end clamping and positioning device and a tunnel-type heating furnace. The rough pipe rear end clamping and extruding device, the rough pipe preheating device, the rough pipe forging device, the front end clamping and positioning device and the tunnel-type heating furnace are arranged in sequence along the traveling direction of the rough pipe roller. The rough pipe rear end clamping and extruding device is arranged on both sides of the rough pipe roller and radially clamps the rough pipe through hydraulic power. The bottom of the rough pipe rear end clamping and extruding device is provided with a track and applies axial extrusion driving force to the clamped rough pipe through hydraulic power. The rough pipe preheating device is an annular induction heating device. The rough pipe forging device is arranged adjacent to the rough pipe preheating device. A plurality of arc-shaped forging dies are annularly provided in the rough pipe forging device. The arc-shaped forging dies are driven to extend and retract by hydraulic power. A plurality of the front end clamping and positioning devices are arranged on both sides of the rough pipe roller. The rough pipe roller passes through the tunnel-type heating furnace.

2. The high-efficiency welding processing equipment for seamless pipes with low cutting loss rate according to claim 1 is characterized in that: A plurality of arc-shaped forging dies are installed on a circumferential rotating mechanism.

3. The high-efficiency welding processing equipment for seamless pipes with low cutting loss rate according to claim 1 is characterized in that: The rough pipe clamping end of the rough pipe rear end clamping and extrusion device is L-shaped, one side of the L-shaped side is parallel to the side of the rough pipe, and the other side is against the rear end of the rough pipe.

4. The high-efficiency welding processing equipment for seamless pipes with low cutting loss rate according to claim 1 is characterized in that: The bottoms of the rough pipe preheating device and the rough pipe forging device are provided with movable guide rails.

5. The high-efficiency welding processing equipment for seamless pipes with low cutting loss rate according to claim 1 is characterized in that: A radial movable guide rail is provided at the bottom of the rough pipe front end clamping and positioning device.

6. The high-efficiency welding processing equipment for seamless pipes with low cutting loss rate according to claim 1 is characterized in that: A measuring device and a flying saw are also provided at the material inlet end of the clamping and extruding device at the rear end of the rough pipe.

7. The high-efficiency welding processing equipment for seamless pipes with low cutting loss rate according to claim 1 is characterized in that: A high-pressure water dephosphorization machine is provided at the discharge end of the tunnel-type heating furnace, after which the rough pipe roller conveyor enters the tension reducing device.

8. A method for using the high-efficiency welding processing equipment for seamless pipes with low cutting loss rate according to any one of claims 1 to 7, characterized in that: The specific contents include the following: 1) The rough pipe after oblique rolling and perforation passes through the measuring device on the rough pipe roller; then the flying saw locates and cuts the axial irregular ends of the rough pipe after oblique rolling and perforation according to the data fed back by the measuring device; 2) The rear end clamping and extruding device of the rough pipe and the front end clamping and positioning device of the rough pipe are respectively used to clamp the tail end of the subsequent rough pipe and the edge of the previous rough pipe, and the rear end clamping and extruding device of the rough pipe is pushed to make the head end of the subsequent rough pipe fit with the tail end of the previous rough pipe; at the same time, the rough pipe preheating device is used to heat the fitting part to make the temperature reach the semi-solid range of the rough pipe, and at the same time, the rear end clamping and extruding device of the rough pipe is used to apply pressure to the fitting part of the two pipes. The semi-solid metal melt at the fitting part moves to both sides under the action of the extrusion force, thereby achieving solid-phase welding of the two rough pipes; then, the rough pipe forging device is moved to the fitting part of the two pipes, and the metal melt at the fitting part of the two pipes is forged by the rough pipe forging device within its semi-solid temperature range so that the pipe diameter at the fitting part is consistent with that of the rough pipe. Subsequently, the rough pipe that has completed welding enters the tunnel heating furnace for heating, and the above-mentioned welding action is repeated when the next rough pipe enters the equipment. 3) After welding, the rough pipe continues to move to the high-pressure water dephosphorization machine and tension reducing device through the rough pipe roller.

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