Manufacturing method of composite guide plate for hot-rolled seamless steel pipe perforating machine

Abstract

The invention relates to the technical field of guide plate manufacturing, in particular to a manufacturing method of a composite guide plate for a hot-rolled seamless steel pipe perforating machine, which comprises the following steps: S1, designing a guide plate drawing according to data of a perforating unit, and decomposing the guide plate into an embedded working layer and a base body; s2, a medium-frequency induction furnace is used for heating the embedded working layer metal mother solution and the matrix melt at the same time; s3, the time is well controlled, and the embedded working layer and the base body are metallurgically bonded; s4, stress removal tempering is conducted on the formed guide plate; and S5, the embedded working face of the guide plate is ground, and other parts are machined, so that the guide plate meets the design requirements. The guide plate has the characteristics of high strength and high toughness, so that the requirement of high fracture resistance of the pressure accumulator when the pressure accumulator is subjected to air pressure is met.

Description

Technical Field

[0001] The present application relates to the technical field of guide plate manufacturing, and in particular to a method for manufacturing a composite guide plate for a hot-rolled seamless steel pipe piercing machine. Background Art

[0002] The seamless steel pipes used in the water supply pipes for units of 350MW and above are produced by hot rolling. The production process of hot rolled seamless steel pipes mainly includes basic processes such as tube heating, perforation, rolling, sizing / reducing, and finishing. The main thermal deformation processes are: perforation, tube rolling, and sizing / reducing.

[0003] At present, the most widely used perforating equipment is the tapered roller two-roller oblique rolling perforator. Under the joint action of the roller, guide plate and mandrel, the solid tube blanks of different specifications after heating are turned into hollow blanks. The perforation process is the most important process of thermal deformation. The quality of the raw tube after perforation is directly related to the quality of the next process and the final product. It is required to ensure that the wall thickness of the perforated raw tube is uniform, the distortion is small, the ovality is small, and the geometric size accuracy is high. At the same time, the internal and external surfaces of the raw tube are required to be smooth, without scars, folds, scratches, cracks, uneven bumps and gaps.

[0004] During the piercing process, the guide plate is fixed and forms a closed hole with the rotating roller and the mandrel to complete the piercing of the seamless steel pipe. In addition to the guiding function, the guide plate also has to limit the lateral deformation and increase the closure of the hole. At the same time, it has to withstand the impact of the high-temperature steel billet and the sliding friction under the huge compressive stress, which affects the kinematics and dynamics of the metal. The guide plate is required to have high strength and high toughness. Therefore, the quality and service life of the guide plate directly affect the cost and quality of the final seamless steel pipe product.

[0005] Perforation guides are usually made of low-nickel high-chromium cast iron. Due to the extremely harsh working environment in which they are embedded, the service life of the guides is short, especially in large-scale perforation units. This not only increases production costs, but also easily causes damage to the guides when rolling high-quality products such as alloy pipes, affecting product quality. Summary of the invention

[0006] In order to increase the service life of the guide plate and reduce production costs, the present application provides a method for manufacturing a composite guide plate for a hot-rolled seamless steel pipe piercing machine.

[0007] The present application provides a method for manufacturing a composite guide plate for a hot-rolled seamless steel pipe piercing machine, which adopts the following technical solution: A method for manufacturing a composite guide plate for a hot-rolled seamless steel pipe piercing machine, comprising: S1: Design the guide plate drawing according to the perforating unit data, and decompose the guide plate design into two parts: the embedded working layer and the base body; S2: Use a medium frequency induction furnace to heat the embedded working layer metal mother liquid and the matrix melt simultaneously; S3: Control the time to make the embedded working layer metallurgically bonded with the matrix; S4: Stress relief tempering of the formed guide plate; S5: Grind the guide plate embedded work surface and machine other parts to meet the design requirements.

[0008] By adopting the above technical solution, the guide plate drawing is first designed according to the perforating unit data, and the guide plate design is decomposed into two parts: the embedded working layer and the matrix. Then, the embedded working layer metal mother liquid and the matrix are heated to a suitable temperature using a medium-frequency induction furnace or other heating methods, and the heating time is controlled to achieve metallurgical bonding. Subsequently, stress tempering treatment and mechanical processing are performed to complete the manufacture of the guide plate, thereby completing the guide plate manufacturing process. The guide plate has the characteristics of high strength and high toughness through the treatment method of stress relief annealing after heat treatment, so as to meet the requirements of high crack resistance of the accumulator under gas pressure.

[0009] Preferably, the method further comprises S6: cleaning and deburring the guide plate after machining.

[0010] By adopting the above technical solution, residual metal chips, oil stains and other contaminants are cleaned and removed, making the surface of the guide plate smoother, reducing processing defects and improving the appearance quality of the parts; deburring can remove sharp edges and protrusions generated during the processing to ensure that the surface of the guide plate is smooth and avoid affecting subsequent use.

[0011] Preferably, the method further includes S7: performing surface hardening treatment or coating application on the guide plate.

[0012] By adopting the above technical solution, the surface quality of the guide plate can be improved through hardening treatment or coating, making it smoother, reducing defects, improving the accuracy and consistency of the product, and the coating can reduce the friction loss between the guide plate and the metal pipe.

[0013] Preferably, it also includes S8: conducting a comprehensive quality inspection and performance test on the guide plate, including a dimension inspection, a material strength test, etc., to ensure that the design standards are met.

[0014] By adopting the above technical solutions, ensure that the dimensions of the guide plate meet the requirements of the design drawings, ensure its assembly accuracy and good coordination with other components. Non-standard dimensions may lead to assembly difficulties or poor performance; confirm that the strength, hardness and other mechanical properties of the guide plate material meet the design requirements. This is the key to ensure that the guide plate can withstand the embedded workload and use environment.

[0015] Preferably, the medium frequency induction furnace in S2 comprises a frame and a furnace body, the frame is provided with a mounting groove for placing the furnace body, the mounting groove is provided with a clamping assembly for clamping the furnace body, the clamping assembly comprises two fixed plates and two driving members, each of the driving members is used to drive one of the fixed plates to approach the other fixed plate to clamp one side of the furnace body.

[0016] By adopting the above technical solution, after the furnace body is placed into the frame, the two fixing plates are brought close to each other through the driving member to contact and squeeze the surface of the furnace body, thereby fixing the furnace body, thereby preventing the furnace body from shaking during the embedding work, which would affect the quality of the internal products.

[0017] Preferably, an anti-slip layer is installed on the side where the two fixing plates are close to each other.

[0018] By adopting the above technical solution, an anti-slip layer is installed on one side of the fixed plate, which helps to increase the friction of clamping and prevent the furnace body from sliding during the clamping process, thereby improving the clamping effect and the safety of the furnace body; the anti-slip layer can reduce the damage that may occur when the furnace body contacts the fixed plate, protect the surface of the furnace body from scratches or indentations, and extend the service life of the furnace body.

[0019] Preferably, the driving member includes a mounting frame, a first gear, a second gear, a first rack, a second rack, a support plate and a telescopic member, the support plate is slidably connected to the mounting groove and has a support plate for supporting the furnace body, the sliding direction of the support plate is a vertical direction, the telescopic member is located between the support plate and the bottom wall of the mounting groove, the second rack is connected to the fixed plate, the mounting frame is located on one side in the width direction of the mounting groove and the mounting frame is connected to the diameter gauge body, a sliding groove is provided on the mounting frame, the second rack is slidably connected to the sliding groove and the sliding direction of the second rack is the length direction of the mounting groove, the first gear and the second gear are both rotatably arranged on the mounting frame, the first gear is circumferentially fixed to the second gear, the second gear is meshingly connected to the second rack, the first gear is meshingly connected to the first rack, the first rack is connected to the top of the support plate and the first rack is arranged along the vertical direction.

[0020] By adopting the above technical solution, when the furnace body is placed on the support plate, under the action of the gravity of the furnace body, the support plate is slidably connected to the mounting groove and moves downward, driving the first rack to move downward at the same time, thereby driving the first gear to rotate, and then driving the second gear to rotate, and finally driving the second rack to slide along the length direction of the mounting groove, thereby causing the two fixed plates to move along the length direction of the mounting groove, and the two fixed plates are close to each other to clamp one side of the furnace body, saving energy.

[0021] Preferably, the telescopic member comprises a plurality of telescopic springs, one end of the plurality of telescopic springs is connected to the bottom wall of the mounting groove, and the other end of the plurality of telescopic springs is connected to the bottom of the support plate.

[0022] By adopting the above technical solution, when the support plate slides, the telescopic spring is compressed, and when the furnace body is lifted, the telescopic spring is reset to drive the support plate to reset. The structure is simple and easy to purchase.

[0023] Preferably, the support plate is connected to a limit piece for limiting the support plate when it slides, and the limit piece includes two limit columns, and the two limit columns are arranged in the vertical direction. The two limit columns are respectively located on both sides of the length direction of the installation groove, and one end of the two limit columns is connected to the bottom wall of the installation groove. A limit hole is provided on the support plate, and the other end of the limit column is slidably connected to the limit hole and the sliding direction is the vertical direction.

[0024] By adopting the above technical solution, when the support plate slides, the limiting column is slidably connected with the limiting hole, thereby preventing the support plate from deviating from the vertical sliding direction, thereby improving the stability of the support plate.

[0025] Preferably, a cover plate is provided on the top of the furnace body, an exhaust box is provided at the bottom of the cover plate, an exhaust pump is provided in the exhaust box, an exhaust hood is provided at the bottom of the exhaust box, the exhaust box is connected to an exhaust pipe, and the exhaust pipe is connected to the outside.

[0026] By adopting the above technical solution, after the use of the medium frequency induction furnace is finished, the heat and harmful gases are absorbed by the vacuum pump and then discharged through the exhaust pipe, thereby protecting the safety of the operator.

[0027] In summary, the present application includes at least one of the following beneficial technical effects: 1. First, design the guide plate drawing according to the perforating unit data, and decompose the guide plate design into two parts: the embedded working layer and the matrix. Then, use a medium-frequency induction furnace or other heating methods to heat the embedded working layer metal mother liquid and the matrix to a suitable temperature, and control the heating time to achieve metallurgical bonding. Then, stress tempering treatment and mechanical processing are carried out to complete the manufacture of the guide plate, thereby completing the guide plate manufacturing process. The stress relief annealing treatment after heat treatment makes the guide plate have the characteristics of high strength and high toughness, so as to meet the requirements of high crack resistance of the accumulator under gas pressure; 2. After the furnace body is placed into the frame, the two fixing plates are brought close to each other through the driving member to contact and squeeze the surface of the furnace body, thereby fixing the furnace body, thereby preventing the furnace body from shaking during the embedding work, which may affect the quality of the internal products; 3. When the furnace body is placed on the support plate, under the action of the gravity of the furnace body, the support plate is slidably connected to the mounting groove and moves downward, driving the first rack to move downward at the same time, thereby driving the first gear to rotate, and then driving the second gear to rotate, and finally driving the second rack to slide along the length direction of the mounting groove, so that the two fixed plates move along the length direction of the mounting groove, and the two fixed plates approach each other to clamp one side of the furnace body, saving energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a method flow chart of a method for manufacturing a composite guide plate for a hot-rolled seamless steel pipe piercing machine according to an embodiment of the present application.

[0029] Figure 2 It is a structural schematic diagram of a composite guide plate.

[0030] Figure 3 It is a cross-sectional schematic diagram of the medium frequency induction furnace of the embodiment of the present application, mainly showing the exhaust device.

[0031] Figure 4 It is a partial structural diagram of the medium frequency induction furnace of the embodiment of the present application, mainly showing the driving parts.

[0032] Explanation of the reference numerals: 100, embedded working layer; 200, base; 1, frame; 11, mounting groove; 2, furnace body; 31, fixing plate; 32, anti-slip layer; 41, mounting frame; 42, first gear; 43, second gear; 44, first rack; 45, second rack; 46, support plate; 461, limiting hole; 47, telescopic spring; 5, limiting column; 6, cover plate; 71, vacuum box; 72, vacuum pump; 73, vacuum hood; 74, exhaust pipe. DETAILED DESCRIPTION

[0033] The present application is further described in detail below in conjunction with all the accompanying drawings.

[0034] The present application embodiment discloses a method for manufacturing a composite guide plate for a hot-rolled seamless steel pipe piercing machine. Figure 1 , Figure 2 A method for manufacturing a composite guide plate for a hot-rolled seamless steel pipe piercing machine comprises: S1: When designing the guide plate drawing, the structure of the guide plate needs to be defined first according to the actual needs of the perforating unit. The guide plate is divided into an embedding working layer 100 (the surface that bears the actual embedding workload) and a base 200 (the basic structure that supports the embedding working layer 100) to ensure that the guide plate has the required performance and durability during embedding work; S2: using a medium frequency induction furnace to heat the embedded working layer 100 metal mother liquid and the matrix 200 melt simultaneously; S3: Control the time well to make the embedded working layer 100 metallurgically bonded with the substrate 200. The embedded working layer 100 and the substrate 200 after heating need to be kept in a molten state for a certain period of time, which can be obtained through multiple experiments to ensure the metallurgical bonding between them. Controlling the time is crucial to achieve a good bonding and avoid incomplete fusion of materials or quality problems; S4: Stress relief and tempering are performed on the formed guide plate. Stress relief and tempering are performed on the formed guide plate to reduce the residual stress inside the material, thereby avoiding deformation and cracks in subsequent processing or use, and improving the stability and life of the guide plate; S5: Grind the guide plate embedding work surface and machine other parts to make it meet the design requirements. Grinding and machining are used to adjust the size, surface roughness and other key parameters of the guide plate to meet the specifications of the design drawings. This step ensures that the guide plate can be effectively embedded in the work in actual application; S6: After machining, the guide plate is cleaned and deburred. The chips, oil stains and burrs generated during the machining process need to be removed. The cleaning and deburring steps are to improve the surface quality of the guide plate and prevent it from affecting subsequent processing and use; S7: Surface hardening or coating is applied to the guide plate. Surface hardening or coating can improve the wear resistance, corrosion resistance and other properties of the guide plate. S8: Conduct comprehensive quality inspection and performance testing on the guide plate, including dimensional inspection, material strength test, etc., to ensure that it meets the design standards. Through dimensional inspection, material strength test and other related tests, it can be verified whether the guide plate meets the design standards and ensure its reliable performance.

[0035] Among them Figure 3 as well as Figure 4 The medium frequency induction furnace shown in S2 includes a frame 1 and a furnace body 2. A mounting groove 11 for placing the furnace body 2 is provided in the frame 1. The horizontal cross section of the mounting groove 11 is rectangular. Two groups of clamping components for clamping the two sides of the peripheral wall of the furnace body 2 are respectively arranged on both sides of the width direction of the mounting groove 11. The clamping components include two fixing plates 31 and two driving members. Each driving member is used to drive one of the fixing plates 31 to approach another fixing plate 31 to clamp one end of the furnace body 2. An anti-slip layer 32 is installed on the side where the fixing plates 31 are close to each other. The anti-slip layer 32 is a silicone layer. The anti-slip layer 32 abuts against the peripheral wall of the furnace body 2.

[0036] The driving member includes a mounting frame 41, a first gear 42, a second gear 43, a first rack 44, a second rack 45, a support plate 46 and a telescopic member. The support plate 46 is slidably connected to the mounting groove 11 and the sliding direction is the vertical direction. The telescopic member is located between the support plate 46 and the bottom wall of the mounting groove 11. The telescopic member includes three telescopic springs 47. One end of the three telescopic springs 47 is bonded to the bottom wall of the mounting groove 11, and the other end of the three telescopic springs 47 is bonded to the bottom of the support plate 46. One end of the second rack 45 is connected to the fixing plate 31 by bolts. The mounting frame 41 is located on one side of the mounting groove 11 in the width direction and the mounting frame 41 is connected to the frame The mounting frame 41 is connected by bolts, a slide groove is provided on the mounting frame 41, one end of the second rack 45 away from the fixing plate 31 is connected with a slide column, the slide column is slidably connected with the slide groove, and the sliding direction of the second rack 45 is the length direction of the mounting groove 11, the mounting frame 41 is connected with a support plate, a rotating shaft is provided on the support plate, the first gear 42 and the second gear 43 are both rotatably sleeved on the rotating shaft, the first gear 42 and the second gear 43 are circumferentially fixed, the second gear 43 is meshed with the second rack 45, the first gear 42 is meshed with the first rack 44, the first rack 44 is vertically arranged, and its bottom is connected with the top of the support plate 46 by bolts.

[0037] The support plate 46 is connected with a limit member for limiting the support plate 46 when it slides, and the limit member includes two limit columns 5 and two limit bases. The two limit columns 5 are arranged in the vertical direction, and the two limit columns 5 are respectively located on both sides of the length direction of the installation groove 11. Three springs are located between the two limit columns 5. The bottom ends of the two limit columns 5 are bolted to the bottom wall of the installation groove 11. Two limit holes 461 are provided on the support plate 46. The other end of the limit column 5 is slidably connected to the limit hole 461 and the sliding direction is the vertical direction.

[0038] Finally, a placement opening is opened on the top of the furnace body 2, and a cover plate 6 is provided at the placement opening of the furnace body 2. An exhaust box 71 is connected to the bottom of the cover plate 6 by bolts. An exhaust pump 72 is installed in the exhaust box 71. An exhaust hood 73 is arranged at the bottom of the exhaust box 71. The air inlet of the exhaust pump 72 is connected to the exhaust pump 72, and the air outlet of the exhaust pump 72 is connected to the inside of the exhaust box 71. The exhaust box 71 is connected to an exhaust pipe 74, which passes through the cover plate 6 and is connected to the outside world, and can discharge hot air and harmful gases to the exhaust gas treatment equipment.

[0039] The implementation principle of the manufacturing method of a composite guide plate for a hot-rolled seamless steel pipe punching machine in the embodiment of the present application is as follows: first, design the guide plate drawing according to the punching machine group data, and decompose the guide plate design into two parts: the embedded working layer 100 and the matrix 200. Then, use a medium-frequency induction furnace or other heating methods to heat the metal mother liquid of the embedded working layer 100 and the matrix 200 to a suitable temperature, and control the heating time to achieve metallurgical bonding. Subsequently, stress tempering treatment and mechanical processing are performed to complete the manufacture of the guide plate, thereby completing the guide plate manufacturing process. The guide plate has the characteristics of high strength and high toughness through the treatment method of stress relief annealing after heat treatment, so as to meet the requirements of high crack resistance of the accumulator under gas pressure; After the furnace body 2 is placed into the frame 1, the two fixing plates 31 are brought close to each other through the driving member to contact and squeeze the surface of the furnace body 2, thereby fixing the furnace body 2, thereby preventing the furnace body 2 from shaking during the embedding work, which may affect the quality of the internal products.

[0040] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A method for manufacturing a composite guide plate for a hot-rolled seamless steel pipe piercing machine, characterized in that: include: S1: Designing a guide plate drawing based on the perforating unit data, and decomposing the guide plate design into two parts: an embedded working layer (100) and a base body (200); S2: using a medium frequency induction furnace to heat the embedded working layer (100) metal mother liquid and the substrate (200) melt simultaneously; S3: controlling the time so that the embedded working layer (100) and the substrate (200) are metallurgically bonded; S4: Stress relief tempering of the formed guide plate; S5: Grind the guide plate embedded work surface and machine other parts to meet the design requirements.

2. The method for manufacturing a composite guide plate for a hot-rolled seamless steel pipe piercing machine according to claim 1, characterized in that: Also included is S6: cleaning and deburring of the guide plate after machining.

3. The method for manufacturing a composite guide plate for a hot-rolled seamless steel pipe piercing machine according to claim 2, characterized in that: Also included is S7: surface hardening or coating application on the guide bar.

4. The method for manufacturing a composite guide plate for a hot-rolled seamless steel pipe piercing machine according to claim 3, characterized in that: Also includes S8: Comprehensive quality inspection and performance testing of the guide plate, including dimensional inspection, material strength testing, etc., to ensure that it meets the design standards.

5. The method for manufacturing a composite guide plate for a hot-rolled seamless steel pipe piercing machine according to claim 1, characterized in that: The medium-frequency induction furnace in S2 comprises a frame (1) and a furnace body (2); a mounting groove (11) for placing the furnace body (2) is provided in the frame (1); a clamping assembly for clamping the furnace body (2) is provided in the mounting groove (11); the clamping assembly comprises two fixing plates (31) and two driving members; each of the driving members is used to drive one of the fixing plates (31) to approach another fixing plate (31) to clamp one side of the furnace body (2).

6. The method for manufacturing a composite guide plate for a hot-rolled seamless steel pipe piercing machine according to claim 5, characterized in that: An anti-slip layer (32) is installed on one side of the two fixing plates (31) that are close to each other.

7. The method for manufacturing a composite guide plate for a hot-rolled seamless steel pipe piercing machine according to claim 5, characterized in that: The driving member comprises a mounting frame (41), a first gear (42), a second gear (43), a first rack (44), a second rack (45), a support plate (46) and a telescopic member, wherein the support plate (46) is slidably connected to the mounting groove (11) and has a support plate (46) for supporting the furnace body (2), the sliding direction of the support plate (46) is a vertical direction, the telescopic member is located between the support plate (46) and the bottom wall of the mounting groove (11), the second rack (45) is connected to the fixed plate (31), the mounting frame (41) is located on one side of the mounting groove (11) in the width direction and the mounting frame (41) is connected to the diameter measuring instrument The mounting frame (41) is connected to the main body, a sliding groove is provided on the mounting frame (41), the second rack (45) is slidably connected to the sliding groove and the sliding direction of the second rack (45) is the length direction of the mounting groove (11), the first gear (42) and the second gear (43) are both rotatably arranged on the mounting frame (41), the first gear (42) and the second gear (43) are circumferentially fixed, the second gear (43) and the second rack (45) are meshedly connected, the first gear (42) and the first rack (44) are meshedly connected, the first rack (44) is connected to the top of the support plate (46) and the first rack (44) is arranged in the vertical direction.

8. The method for manufacturing a composite guide plate for a hot-rolled seamless steel pipe piercing machine according to claim 7, characterized in that: The telescopic member comprises a plurality of telescopic springs (47), one end of the plurality of telescopic springs (47) being connected to the bottom wall of the mounting groove (11), and the other end of the plurality of telescopic springs (47) being connected to the bottom of the support plate (46).

9. The method for manufacturing a composite guide plate for a hot-rolled seamless steel pipe piercing machine according to claim 7, characterized in that: The support plate (46) is connected to a limiting member for limiting the support plate (46) when it slides, the limiting member comprising two limiting columns (5), the two limiting columns (5) are arranged along the vertical direction, the two limiting columns (5) are respectively located on both sides of the length direction of the installation groove (11), one end of the two limiting columns (5) is connected to the bottom wall of the installation groove (11), the support plate (46) is provided with a limiting hole (461), the other end of the limiting column (5) is slidably connected to the limiting hole (461), and the sliding direction is the vertical direction.

10. The method for manufacturing a composite guide plate for a hot-rolled seamless steel pipe piercing machine according to claim 5, characterized in that: A cover plate (6) is arranged on the top of the furnace body (2), an exhaust box (71) is arranged on the bottom of the cover plate (6), an exhaust pump (72) is arranged inside the exhaust box (71), an exhaust hood (73) is arranged on the bottom of the exhaust box (71), the exhaust box (71) is connected to an exhaust pipe (74), and the exhaust pipe (74) is in communication with the outside.

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