Punching plug structure

Abstract

The invention discloses a piercing plug structure which comprises a plug body, a plurality of hole channels are formed in the plug body, the hole channels are distributed in the outer wall of the plug body in a honeycomb shape, and filler is arranged in the hole channels so that heat conduction can be blocked or the hole walls of the hole channels can be supported through the filler; the filler at least comprises one or more of oxides, carbides, nitrides, halides, sulfides or high-temperature-resistant metals. The problems that an existing top is prone to deformation in a continuous high-temperature state, the heat insulation effect is poor, and the service life is short are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of steel pipe production, and in particular to a perforated plug structure. Background Art

[0002] In the hot rolling and piercing production process of seamless steel pipes, the plug is generally used for processing. Under the action of high-temperature tube billets above 1000℃, the plug is subjected to heat radiation, heat conduction, friction heat and plastic deformation heat. The body temperature, especially the surface temperature, will be very high, which will cause its mechanical strength to drop sharply, resulting in defects such as sticking steel and falling meat, leading to scrapping.

[0003] At present, a plug is a plug having a spiral or annular base which is integrated with the plug body by processing on the circumference and the end face of the head, a spiral groove or annular groove is formed between the bases, and an oxide layer is formed on the bottom or side of the groove by oxidation, thereby increasing the service life of the plug. However, the oxide layer formed in this way cannot completely fill the groove, thereby forming a groove of a certain depth, and the groove on the surface of the spiral or annular groove is easy to form an internal folding defect on the inner surface of the capillary tube during the perforation process, and each groove is independent of each other, and the metal between the grooves is independent of each other, and the mechanical strength is low.

[0004] There is another type of plug that has a cavity inside the plug, and then a rectifier block and a heating block are installed at the front end of the cavity, and a nozzle is set at the front end, and the nozzle and the heating tank are connected, which can improve the front end strength of the plug, help prevent deformation, and accelerate the cooling effect of the plug body. However, this type of plug structure is not specially designed except for the head, and the thickness of the oxide layer on the surface of the plug is limited, the heat insulation effect is limited, resulting in a short life.

[0005] Therefore, there is an urgent need for a plug structure that has high mechanical strength, is not easily deformed, and has a long service life under high temperature conditions. Summary of the invention

[0006] The purpose of the present invention is to provide a perforated plug structure, which solves the problem that the existing plug is prone to deformation under continuous high temperature conditions and has poor heat insulation effect, resulting in a short service life.

[0007] To achieve the above objectives, the first aspect of the present disclosure provides a perforated plug structure, comprising:

[0008] A plug body is provided with a plurality of channels, and the plurality of channels are distributed in a honeycomb shape on the outer wall of the plug body.

[0009] In some embodiments, a filler is disposed in the pores to block heat conduction or support the pore walls of the pores through the filler;

[0010] The filler includes at least one or more of oxides, carbides, nitrides, halides, sulfides or high temperature resistant metals.

[0011] In some embodiments, the channel is in communication with an outer surface of the mandrel body.

[0012] In some embodiments, a sealing layer is provided at the outer surface of the hole corresponding to the plug body to seal the hole;

[0013] The edge of the sealing layer away from the center of the plug body is connected to the edge of the channel.

[0014] In some embodiments, the cross-section of the channel is circular, polygonal, elliptical or other irregular shapes;

[0015] The cross-sectional perimeter of the hole is 0.05-1000 mm, and the depth of the hole is 0.05-500 mm.

[0016] In some embodiments, the distance between two adjacent channels is 0.01-300 mm.

[0017] In some embodiments, the oxide includes at least a substance formed by iron, aluminum, magnesium, zirconium, titanium, silicon, vanadium, calcium, barium, sodium or a rare earth element and oxygen.

[0018] In some embodiments, the carbide includes at least tungsten, titanium, niobium, silicon, zirconium, molybdenum, chromium, vanadium or a substance formed by a rare earth element and carbon.

[0019] In some embodiments, the nitride includes at least silicon, aluminum, titanium, boron, vanadium, niobium, chromium, zirconium or a rare earth element and nitrogen.

[0020] In some embodiments, the halide includes at least substances formed by elements such as calcium, fluorine, magnesium, chlorine, and aluminum.

[0021] In some embodiments, the sulfide includes substances formed by at least elements such as zinc, barium, tungsten, iron, molybdenum, cadmium and lead.

[0022] In some embodiments, the high temperature resistant metal includes molybdenum, tungsten, cobalt, nickel, tantalum, niobium, titanium, hafnium, rhenium or rare earth elements and alloys thereof.

[0023] By adopting the above technical solution, by setting the honeycomb-shaped channels on the main body of the plug, the superior continuous support, interlocking effect and sealing performance of the honeycomb structure are utilized, and the stability and rigidity of the structure are further enhanced, so as to avoid the collapse and deformation of the plug metal due to excessive pressure on the local top head, and the deviation of the geometric dimensions of the plug's outer contour from the designed dimensions. In addition, during the perforation process, the structure is prevented from slipping and deforming. At the same time, the honeycomb structure can maintain its shape and strength under repeated stress. Furthermore, providing a filler with a lower thermal conductivity than the plug body in the channel is conducive to improving the thermal barrier effect, reducing the temperature rise of the composite structure and the plug body, and improving the mechanical properties. When the channel is filled with a filler with a higher thermal strength than the plug body, the flow of the plug body metal at high temperature can be prevented or its flow amplitude can be reduced, thereby improving the plug's shape structure and ability to maintain.

[0024] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings are used to provide further understanding of the present disclosure and constitute a part of the specification. They are used to explain the present disclosure together with the following detailed description, but do not constitute a limitation of the present disclosure.

[0026] In the attached picture:

[0027] Figure 1 It is a schematic diagram of the overall structure of the perforated plug structure provided by the present invention.

[0028] Figure 2 It is a schematic diagram of the overall structure of the front side of the perforated plug structure provided by the present invention.

[0029] Figure 3 It is a schematic cross-sectional structural diagram of the perforated plug structure provided by the present invention.

[0030] Figure 4 The present invention provides Figure 3 Schematic diagram of the enlarged structure at A.

[0031] Figure 5 It is a schematic diagram of the overall structure of a perforated plug structure according to another embodiment of the present invention.

[0032] Figure 6 It is a schematic diagram of the cross-sectional structure of a perforated plug structure according to another embodiment of the present invention.

[0033] Figure 7 The present invention provides Figure 6 Schematic diagram of the enlarged structure at B.

[0034] Description of reference numerals:

[0035] 1. Head body; 2. Hole; 3. Sealing layer. DETAILED DESCRIPTION

[0036] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0037] The present disclosure provides a perforated plug structure, such as Figure 1-Figure 4 As shown, the perforated plug structure comprises a plug body 1 , on which a plurality of channels 2 are formed, and the plurality of channels 2 are distributed in a honeycomb shape on the outer wall of the plug body 1 .

[0038] Each of the holes 2 on the plug body 1 is connected to the outer surface of the plug body 1 , and each of the holes 2 is not connected to each other along the circumferential direction of the plug body 1 .

[0039] In some embodiments, a filler is provided in the pore 2 to block heat conduction or support the pore wall of the pore 2. The filler includes at least one or more of oxides, carbides, nitrides, halides, sulfides or high temperature resistant metals.

[0040] By forming honeycomb-shaped channels 2 on the mandrel body 1, the channels 2 on the mandrel body 1 and the parts between the channels 2 together form a composite structure. This composite structure utilizes the superior continuous support, interlocking effect and sealing performance of the honeycomb structure. Among them, the units composed of each channel 2 and the parts between the channels 2 in the honeycomb structure are continuous, forming an overall support network, which enhances the integrity of the mandrel structure. The adjacent channel units of the honeycomb structure are interconnected, and the hole walls of each unit are continuous and interconnected, and there is an interlocking effect, which further enhances the stability and rigidity of the structure. At present, in the piercing process, the rollers and the mandrel work together to pierce and thin the tube blank. The mandrel is subjected to complex forces, not only bearing the rolling force in the vertical direction, but also the shear friction force and the impact force during the steel biting process. However, by setting the plug body 1 to such a structure, when the plug body 1 is subjected to rolling force and this rolling force acts on the honeycomb structure on the plug surface, the metal of the plug body 1 between the honeycomb structures plays the role of a load-bearing wall, supporting the load like a load-bearing wall, effectively dispersing the pressure, and avoiding excessive local pressure that causes the plug metal to become unstable, collapse and deform, and causes the geometric dimensions of the plug's outer contour to deviate from the designed dimensions.

[0041] In addition, during the perforation process, both the blank and the plug are in rotational motion, and there is a large shear force between them, especially when the blank moves in the axial direction of the plug, while the axial position of the plug is almost fixed. Therefore, there is a large speed difference between the blank and the plug, which also generates impact force during the steel biting process and shear friction during the rolling process. Both forces are very large. When the honeycomb structure is subjected to impact force and shear friction, the adjacent channel units are interconnected and can support each other to prevent the structure from slipping and deforming. Therefore, the honeycomb structure formed on the plug body 1 has a strong compressive resistance. At the same time, during the perforation process, the plug body 1 is under complex stress conditions. The honeycomb structure, due to the closed performance of its hole wall, is conducive to ensuring the integrity of the material filled inside, and avoiding it from falling off or thinning due to excessive stress.

[0042] Furthermore, the pore structure can avoid continuous grooves, thereby avoiding the generation of internal folding defects. Most of the spiral or annular groove structures are open, so the grooves formed along the spiral or annular direction after oxidation treatment are also open, and the open parts form continuous grooves. During the rolling process, the rough tube metal is pressed into the grooves, which easily forms internal folding defects, while the honeycomb structure is closed and will not form continuous grooves, and will not form continuous internal folding defects. At the same time, the plug is repeatedly used in the production process, and the honeycomb structure can maintain its shape and strength under repeated stress, and has good fatigue resistance.

[0043] In addition, the working environment of the plug is characterized by high temperature. By setting fillers formed by oxides, carbides, nitrides, halides, sulfides or high-temperature resistant metals in the channel 2, the volume of the hole can be filled, the surface of the plug can be kept flat and smooth, and the geometric size requirements can be met. It can also support the hole wall, withstand the force from the capillary, avoid stress concentration, avoid deformation and collapse of the hole wall leading to changes in geometric size, and improve the overall strength of the composite structure. At the same time, when filling with fillers with lower thermal conductivity than the plug body 1, it can also effectively block heat from being conducted to the inside of the plug body 1, improve the thermal barrier effect, reduce the temperature rise of the composite structure and the plug body 1, and improve the mechanical properties. When filling with fillers with higher thermal strength than the plug body 1, the flow of the plug body metal at high temperature can be prevented or its flow amplitude can be reduced, thereby improving the ability of the plug to maintain its shape structure.

[0044] It should be noted that the filler set in each of the above-mentioned channels 2 can be one of oxides, carbides, nitrides, halides, sulfides or high-temperature resistant metals or a combination of multiple substances, and on the same plug body 1, the types of fillers set in each channel 2 can be different, and when the filler is set in the channel 2, the entire channel 2 can be filled or a selected part can be filled, and the filling can be set as needed. For example, oxides, carbides, nitrides, halides, sulfides and high-temperature resistant metals have high melting points, good chemical stability and high-temperature strength, and show excellent performance in high-temperature environments.

[0045] It should also be noted that the above-mentioned filler can be set in the channel 2 in a variety of ways, for example, it can be fixed to the channel 2 by welding, or it can be fixed in the channel 2 by compaction or spraying, and it can be fixed as needed during the production process.

[0046] In some embodiments, an oxide film may be provided on the plug body 1 .

[0047] When the above-mentioned oxide film is formed, the plug body 1 may be further heat-treated so as to form an oxide film on the outer surface of the plug body 1 , thereby further improving the thermal barrier effect and mechanical properties of the plug body 1 .

[0048] In some embodiments, the cross section of the above-mentioned channel 2 is circular, polygonal, elliptical or other irregular shapes, wherein the cross section perimeter of the channel 2 is 0.05-1000 mm, and the depth of the channel 2 is 0.05-500 mm.

[0049] Furthermore, the distance between two adjacent channels 2 is 0.01-300 mm.

[0050] The specific shape of the above-mentioned channel 2 can be set as needed. For example, setting the channel 2 to a polygon can make the thickness of the part between the holes, that is, the hole wall part, consistent. For example, the thickness of the hole wall part of a hexagonal hole is more consistent than that of a circular hole. The elliptical hole is conducive to adjustment according to the force direction. For example, the force direction is set to the long axis direction of the elliptical hole, so that a stronger support effect can be obtained. Irregular holes can also be obtained through other processing to adapt to changes in manufacturing conditions and application requirements. For example, several channels 2 in a local part of the head body 1 can be interconnected to form an irregular channel, or irregular channels can be directly punched on the head body 1.

[0051] The cross-sectional circumference, depth and distance between two adjacent channels 2 of the channel 2 can be set according to the size of the plug. For example, for some plugs used for rolling small-diameter raw tubes, the cross-sectional circumference and depth of the channel 2 can be made relatively small, and the distance between two adjacent channels 2 can be adjusted to be relatively smaller; correspondingly, for some plugs used for rolling large-diameter raw tubes, the cross-sectional circumference and depth of the channel 2 can be made relatively large, and the distance between two adjacent channels 2 can be adjusted to be relatively larger. In this way, it is effectively guaranteed that the plug body 1 has good performance during the rolling process.

[0052] In some embodiments, the above oxides include at least iron, aluminum, magnesium, zirconium, titanium, silicon, vanadium, calcium, barium, sodium or substances formed by rare earth elements and oxygen elements. For example, aluminum oxide and zirconium oxide have high melting points, good chemical stability and corrosion resistance, and good high-temperature strength at high temperatures. In addition, some oxides of elements such as iron, silicon and vanadium have good lubrication properties at high temperatures. When such oxides are filled in the channel 2, during the rolling process, it is beneficial to reduce the shear friction on the surface of the plug, thereby reducing the stress and temperature rise, thereby increasing the life of the plug.

[0053] The carbides include at least tungsten, titanium, niobium, silicon, zirconium, molybdenum, chromium, vanadium or substances formed by rare earth elements and carbon elements. For example, titanium carbide, silicon carbide and tungsten carbide have extremely high hardness and wear resistance, and good high temperature strength.

[0054] The above nitrides include at least silicon, aluminum, titanium, boron, vanadium, niobium, chromium, zirconium or rare earth elements and nitrogen. For example, silicon nitride, aluminum nitride and titanium nitride have high melting points, good high temperature strength and oxidation resistance, good wear resistance and thermal shock resistance.

[0055] The above-mentioned halides include substances formed by elements such as calcium, fluorine, magnesium, chlorine, aluminum, etc. For example, aluminum chloride and calcium chloride have good chemical stability and high melting point.

[0056] The above sulfides include at least substances formed by elements such as zinc, barium, tungsten, iron, molybdenum, cadmium and lead. For example, iron sulfide, zinc sulfide and barium sulfide also have high melting points and high temperature strength, good chemical stability and corrosion resistance.

[0057] The above-mentioned high temperature resistant metals include molybdenum, tungsten, cobalt, nickel, tantalum, niobium, titanium, hafnium, rhenium or rare earth elements and their alloys. For example, molybdenum, tantalum and tungsten have extremely high melting points and high temperature strength, and good corrosion resistance. Filling the hole with high temperature resistant metals is beneficial to improving the performance of the composite structure. For example, if a molybdenum alloy is filled in the hole, the molybdenum alloy reacts with oxygen at high temperature to generate molybdenum trioxide, which is easy to sublimate between 800 and 1100°C, which is not only beneficial to the lubrication of the plug surface, but also improves the resistance to steel sticking. For example, tungsten alloy is filled in the channel, and the characteristic of tungsten alloy having higher thermal strength than the plug body is used to prevent the softened plug body metal from flowing at high temperature, or reduce the flow amplitude of the softened plug body metal, which is beneficial to improve the stability of the structure and reduce the changes in the size structure of the plug surface.

[0058] In other embodiments, Figure 5-Figure 7 As shown, the above-mentioned channel 2 is provided with a sealing layer 3 at the outer surface of the plug body 1 to close the channel 2 so that the channel 2 is not connected to the outer surface of the plug body 1. The sealing layer 3 is connected to the edge of the channel 2 away from the edge of the center of the plug body 1.

[0059] By setting the sealing layer 3, the channel 2 on the plug body 1 can be closed. In this way, while ensuring that the plug body 1 has the above-mentioned properties, the channel 2 is relatively closed, which can make the outer surface of the plug more rounded and reduce the burrs generated in the capillary tube during the perforation process. In addition, the filler set in the channel 2 can be better protected.

[0060] It should be noted that the above-mentioned sealing layer 3 can be a high-temperature resistant metal sheet welded to the edge of the channel 2, or a high-temperature resistant metal hot-melted to the edge of the channel 2. As long as the sealing layer 3 is fixed to the channel 2, the present disclosure does not limit it. At the same time, after the sealing layer 3 is set, the curvature of the sealing layer 3 is consistent with the curvature of the surface position of the head body 1 where the corresponding channel 2 is located, so that the appearance of the head body 1 is relatively rounded, avoiding burrs generated during punching.

[0061] In one specific embodiment, the diameter of the plug body 1 is 275 mm, and its surface has a honeycomb-shaped channel 2, which is connected to the outer surface of the plug. The cross section of the channel 2 is circular, the cross-sectional circumference is 7 mm, the depth is 5 mm, and the spacing between the channels 2 and the channels 2 is 5 mm. The inside of the channel 2 is filled with zirconium oxide, specifically zirconium oxide. Zirconium oxide has a low thermal conductivity and good high-temperature strength. Filling in the channel 2 forms a composite structure with the hole wall, which reduces the thermal conductivity of the composite structure, can effectively reduce the increase in the plug temperature, and improve the mechanical properties and life of the plug. In the perforation operation, compared with the plug without a hole, the surface temperature of the plug is reduced from 910°C to 530°C, which greatly reduces the surface temperature of the plug and effectively improves the mechanical properties of the plug. The life of the rolled 9Cr steel pipe reached 36, while the life of the smooth surface plug without using this technology was only 24. Comparing the service life, it was found that the service life of the plug was increased by 50%, proving the effectiveness of the present invention in improving the durability of the plug.

[0062] In another specific embodiment, the diameter of the plug body 1 is 180 mm, and there are honeycomb holes near the surface of the plug. The channel 2 is not connected to the outer surface of the plug. The distance between the channel 2 and the surface is 1 mm. The cross section of the channel 2 is hexagonal, the cross-sectional perimeter is 4 mm, the depth is 4 mm, the spacing between the channel 2 and the channel 2 is 3 mm, and the inside of the hole is filled with titanium nitride. Titanium nitride has low thermal conductivity, good high-temperature strength and wear resistance. It is filled in the hole and forms a composite structure with the hole wall, which reduces the thermal conductivity of the composite structure, can effectively reduce the increase in the temperature of the plug, and improve the mechanical properties and life of the plug. In the piercing operation, compared with the plug without holes, the surface temperature of the plug is reduced from 913°C to 670°C, which greatly reduces the surface temperature of the plug and effectively improves the mechanical properties of the plug. The life of the rolled 9Cr steel pipe reached 32 plugs, while the life of the plug with a smooth surface without using the present technology was only 23 plugs. By comparing the service lives, it was found that the service life of the plug was increased by 39%, proving the effectiveness of the present invention in improving the durability of the plug.

[0063] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0064] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0065] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A perforated plug structure, characterized in that: include: A plug body is provided with a plurality of channels, and the plurality of channels are distributed in a honeycomb shape on the outer wall of the plug body.

2. The perforated plug structure according to claim 1, characterized in that: A filler is arranged in the hole to block heat conduction or support the hole wall of the hole through the filler; The filler includes at least one or more of oxides, carbides, nitrides, halides, sulfides or high temperature resistant metals.

3. The perforated plug structure according to claim 1, characterized in that: The hole is communicated with the outer surface of the plug body.

4. The perforated plug structure according to claim 1, characterized in that: A sealing layer is provided on the outer surface of the hole corresponding to the plug body to seal the hole; The edge of the sealing layer away from the center of the plug body is connected to the edge of the channel.

5. The perforated plug structure according to claim 1, characterized in that: The cross section of the hole is circular, polygonal, elliptical or other irregular shapes; The cross-sectional perimeter of the hole is 0.05-1000 mm, and the depth of the hole is 0.05-500 mm.

6. The perforated plug structure according to claim 1, characterized in that: The distance between two adjacent holes is 0.01-300 mm.

7. The perforated plug structure according to claim 2, characterized in that: The oxide at least includes a substance formed by iron, aluminum, magnesium, zirconium, titanium, silicon, vanadium, calcium, barium, sodium or a rare earth element and oxygen.

8. The perforated plug structure according to claim 2, characterized in that: The carbide at least includes a substance formed by tungsten, titanium, niobium, silicon, zirconium, molybdenum, chromium, vanadium or a rare earth element and carbon.

9. The perforated plug structure according to claim 2, characterized in that: The nitride at least includes a substance formed by silicon, aluminum, titanium, boron, vanadium, niobium, chromium, zirconium or a rare earth element and nitrogen.

10. The perforated plug structure according to claim 2, characterized in that: The halides include at least substances formed by elements such as calcium, fluorine, magnesium, chlorine, and aluminum.

11. The perforated plug structure according to claim 2, characterized in that: The sulfide includes at least substances formed by elements such as zinc, barium, tungsten, iron, molybdenum, cadmium and lead.

12. The perforated plug structure according to claim 2, characterized in that: The high temperature resistant metal includes molybdenum, tungsten, cobalt, nickel, tantalum, niobium, titanium, hafnium, rhenium or rare earth elements and alloys thereof.

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