High speed rolling composite equipment for seamless metal composite pipe

Abstract

The application provides a seamless metal composite pipe high-speed rolling composite equipment, and belongs to the technical field of seamless metal composite pipe forming, wherein a gradient internal cooling corrugated roller system comprises a wave flat roller sleeve, a roller core, a cooling core rod and a rotary joint, a first water inlet through hole, a water delivery groove, a plurality of first water return through holes and an annular water cooling groove are sequentially arranged on the roller core in the axial direction, a second water inlet through hole and a plurality of second water return through holes are sequentially arranged on the cooling core rod in the axial direction, and gradient cooling is realized with the corrugated section as the center. In the rolling process, the gradient internal cooling corrugated roller system and the water cooling core rod are used for performing internal and external double cooling on the composite blank, absorbing the heat generated by the severe plastic deformation, ensuring the stable temperature gradient to coordinate the deformation of the component metals, realizing the controllable interface shape of the seamless metal composite pipe, solving the problems of tearing, rolling jam and intermetallic compound formation caused by the temperature rise of plastic deformation, improving the rolling speed, and improving the product quality and production efficiency.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of seamless metal composite pipe forming, and particularly relates to a high-speed rolling composite equipment for seamless metal composite pipes. BACKGROUND

[0002] Seamless metal composite pipes are structural and functional materials with rigidity, strength, corrosion resistance, wear resistance and other comprehensive properties. The base body and the cladding layer are tightly combined through special forming techniques. Taking the carbon steel / stainless steel composite pipe with the largest demand in China as an example, the pipe not only has high strength and good wear resistance, but also has good corrosion resistance and high temperature resistance, and can be widely used in aerospace, oil exploration, chemical industry, military industry, nuclear power and other fields.

[0003] Rolling composite technology has many performance advantages such as high efficiency, low cost and good bonding, and has become an ideal method for preparing seamless metal composite pipes. However, due to the characteristics of closed cross section, the forming efficiency is low, the bonding strength is weak, and the spatial deformation is difficult. Patent 202011450318.1 proposes a three-roll cross-rolling forming method for seamless metal composite pipes with corrugated bonding surfaces. The forming corrugations on the three rollers are distributed at different distances. The forming corrugations on the three rollers are in turn in contact with the outer wall of the composite pipe blank, thereby obtaining a spatial spiral composite interface. However, the three-roll cross-rolling composite process is a spatial deformation. The contact positions of the three rollers and the composite pipe blank on the rolling axis are staggered, which is a non-symmetrical support, and is prone to deformation instability and corrugation disorder. Patent 202310822876.3 proposes a high-efficiency sizing adjustment cross-rolling equipment and method for seamless metal corrugated composite pipes. Different corrugated conical rollers can be provided with protruding corrugations in the finishing section, which can form a spatial spiral corrugation on the outer surface of the composite pipe blank, and is used for preparing seamless metal corrugated composite pipes. However, this method cannot obtain a spatial spiral composite interface.

[0004] However, the three-roll cross-rolling composite method belongs to large plastic deformation, which will produce intense plastic deformation heat, thereby causing the temperature of the composite pipe blank to rise. For stainless steel / carbon steel composite pipes, the temperature rise will lead to the reduction of the deformation resistance of the component metals, thereby causing the outer pipe to tear and other phenomena; and for titanium / steel composite pipes, the temperature rise will produce a large amount of intermetallic compounds, reducing the interface bonding strength. In addition, when there are corrugations on the surface of the roller, stress concentration will be formed during the intense spatial plastic deformation process, thereby producing local high temperature, further exacerbating tearing, rolling jam and other phenomena, and will cause the wear of the corrugations on the surface of the roller to be extremely serious, the service life to be significantly reduced, and the cost to be greatly increased. However, the uniformity of the traditional external water cooling method is not ideal, which not only cannot directly act on the deformation zone to play a cooling role, but also will produce obvious non-uniform thermal shock, which will also lead to the reduction of the service life of the roller and cause the performance of the product to be uneven. Although reducing the rolling speed is expected to improve the temperature rise problem, but this will lead to low friction, and the situation of being unable to bite in, which will seriously affect the production efficiency.

[0005] Therefore, how to efficiently realize the controllable spatial composite interface shape of seamless metal composite pipes, solve the problems of tearing, rolling jam, intermetallic compound formation and other problems caused by plastic deformation temperature rise, and improve the rolling speed has become a problem to be solved. SUMMARY

[0006] In order to solve the above problems of the prior art, the present application provides a seamless metal composite pipe high-speed rolling composite equipment, which realizes internal and external double cooling of the preformed composite blank by the water-cooled core rod during the rolling composite process, thereby absorbing the heat generated by intense plastic deformation, solving the problems of tearing, rolling jam, intermetallic compound formation and other problems, and improving the product quality and production efficiency.

[0007] In order to achieve the above purpose, the present application adopts the following technical scheme:

[0008] The present application provides a seamless metal composite pipe high-speed rolling composite equipment, which comprises a transmission system, a rack, a press-down system, a gradient internal cooling corrugated roller system, an online gradient heating device and a core rod conveying system.

[0009] The gradient internal cooling corrugated roller system comprises a wave flat roller sleeve, a roller core, a cooling core rod and a rotary joint, the wave flat roller sleeve is sleeved on the outer circle of the roller core, the cooling core rod is installed on the inner circle of the roller core, and the rotary joint is fixedly installed at the end of the cooling core rod away from the roller core.

[0010] The wave flat roller sleeve comprises a biting section, a corrugated section, a rolling flat section and a diameter expanding section which are sequentially arranged along the rolling axis direction, and the corrugated section inlet side is provided with a convex corrugation.

[0011] The wave height of the convex corrugation of the corrugation section is regulated to control the spatial composite interface morphology of the seamless metal composite pipe.

[0012] The roller core comprises a first water inlet through hole, an annular water cooling groove, a water conveying groove and a first water return through hole, the outer surface of the roller core is provided with a plurality of annular water cooling grooves arranged in the axial direction and a plurality of water conveying grooves arranged in the transverse direction, the first water inlet through hole is located at a corresponding position of the corrugation section of the wave flat roller sleeve, and the first water inlet through hole is uniformly distributed on the annular water cooling groove in the middle around the axial center line of the roller core, a plurality of first water return through holes are arranged on both sides of the first water inlet through hole in the axial direction, and the plurality of first water return through holes are uniformly distributed on the annular water cooling grooves on both sides around the axial center line of the roller core.

[0013] The cooling core rod comprises an outer cooling core pipe, an inner cooling core pipe, a first blocking ring and a second blocking ring, a second water inlet through hole is arranged at a corresponding position of the first water inlet through hole in the axial direction of the cooling core rod, the second water inlet through hole is uniformly distributed around the axial center line of the cooling core rod, the first blocking ring and the second blocking ring are arranged on both sides of the second water inlet through hole respectively, and a second water return through hole is arranged at a corresponding position of the first water return through hole in the axial direction of the outer cooling core pipe; the rotary joint is connected with the outer cooling core pipe and the inner cooling core pipe respectively; the core rod conveying system comprises a core rod trolley and a water-cooled core rod, and the water-cooled core rod is fixed on the core rod trolley.

[0014] Preferably, the wave height of the convex corrugation of the corrugation section is:

[0015] ;

[0016] wherein, X represents the horizontal coordinate of the center of the convex corrugation, and the unit is mm; α represents the rolling angle, and the unit is °; L represents the width of the convex corrugation, and the unit is mm; y 3 represents the wave height of the convex corrugation, and the unit is mm; y 2 represents the vertical coordinate of the center, and the unit is mm; y 1 represents the vertical radius of the center, and the unit is mm.

[0017] Preferably, the upper end of the second water inlet through hole is provided with a booster ring, and the booster ring is arranged between the first blocking ring and the second blocking ring.

[0018] Preferably, the second water inlet through hole and the first water inlet through hole are arranged one by one in the radial direction, the second water inlet through hole penetrates the outer cooling core pipe and the inner cooling core pipe, and the second water return through hole penetrates the outer cooling core pipe.

[0019] Preferably, the distribution interval of the annular water cooling groove on both sides of the annular water cooling groove is gradually reduced or the diameter of the first water inlet hole on both sides of the annular water cooling groove is gradually increased.

[0020] Preferably, the first water outlet hole and the first water inlet hole are arranged in a staggered manner along the circumference of the roller core and penetrate the roller core.

[0021] Preferably, the water conveying groove penetrates each group of annular water cooling grooves along the axis of the roller core.

[0022] Compared with the prior art, the present application has the following advantages:

[0023] (1) The corrugation size of the present application is accurately controllable, and the space composite interface is customized: by changing the convex corrugation size of the corrugation section, which is lower than the flattening section, flush with the flattening section or higher than the flattening section, the precise regulation and control of the space composite interface morphology of the seamless metal composite pipe can be realized, and a micro corrugation interface or a macro corrugation interface can be obtained.

[0024] (2) The method of the present application can improve the uniformity of the roller temperature, reduce the wear and deformation of the corrugation section, and prolong the service life: by gradient internal cooling corrugated roller system, gradient cooling is carried out according to the deformation intensity and temperature rise of different stages of the roller shape, so as to realize accurate cooling in the process of rolling the composite pipe blank, significantly improve the uniformity of the roller temperature distribution, avoid deformation and damage of the roller due to uneven temperature, and ensure the strength of the corrugation by preferentially cooling the corrugation section of the roller, thereby reducing wear and consumption, and prolonging the service life of the roller.

[0025] (3) The method of the present application can improve the product forming quality and improve the interface bonding performance: by gradient internal cooling corrugated roller system and internal cooling mandrel for double cooling of the direct diameter of the deformation zone, the method can avoid a large amount of plastic deformation heat generated by severe plastic deformation and high strain rate in the process of rolling the composite pipe blank, form a stable temperature gradient in the deformation process, solve the tearing, rolling jam and other failure problems caused by the decrease of deformation resistance due to the deformation and temperature rise of the composite pipe blank in the corrugation section, ensure the consistency and uniformity of the entire forming process, improve the rolling speed and thus the production efficiency and shorten the production cycle, and avoid a large amount of intermetallic compounds at the interface, improve the interface bonding performance, and thus improve the product quality. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a schematic diagram of the whole composition of the high-speed rolling and composite equipment of the seamless metal composite pipe of the present application.

[0027] Figure 2 It is a schematic diagram of the assembly of the gradient internal cooling corrugated roller system of the high-speed rolling and composite equipment of the seamless metal composite pipe of the present application.

[0028] Figure 3 The profile schematic diagram of the gradient internal cooling corrugated roller system of the seamless metal composite pipe high-speed rolling composite equipment of the present application;

[0029] Figure 4 The wave flat roller sleeve schematic diagram of the seamless metal composite pipe high-speed rolling composite equipment of the present application;

[0030] Figure 5 The roller core profile schematic diagram of the seamless metal composite pipe high-speed rolling composite equipment of the present application;

[0031] Figure 6 The roller core model schematic diagram of the seamless metal composite pipe high-speed rolling composite equipment of the present application;

[0032] Figure 7 The cooling core rod profile schematic diagram of the seamless metal composite pipe high-speed rolling composite equipment of the present application;

[0033] Figure 8 The core rod conveying system schematic diagram of the seamless metal composite pipe high-speed rolling composite equipment of the present application;

[0034] Figure 9 The wave flat roller sleeve schematic diagram of the seamless metal composite pipe high-speed rolling composite equipment of the present application;

[0035] Figure 10 The relationship between the convex corrugation size and the abscissa of the center of the circle of the wave flat roller sleeve of the seamless metal composite pipe high-speed rolling composite equipment of the present application;

[0036] Figure 11 The convex corrugation schematic diagram of the wave flat roller sleeve and the outer edge of the convex corrugation of the seamless metal composite pipe high-speed rolling composite equipment of the present application is lower than the outer surface of the rolling flat section;

[0037] Figure 12 The appearance schematic diagram of the seamless metal composite pipe after rolling when the outer edge of the convex corrugation of the wave flat roller sleeve of the seamless metal composite pipe high-speed rolling composite equipment of the present application is lower than the rolling flat section;

[0038] Figure 13 The convex corrugation schematic diagram of the wave flat roller sleeve and the outer edge of the convex corrugation of the seamless metal composite pipe high-speed rolling composite equipment of the present application is flush with the outer surface of the rolling flat section;

[0039] Figure 14 The appearance schematic diagram of the seamless metal composite pipe after rolling when the outer edge of the convex corrugation of the wave flat roller sleeve of the seamless metal composite pipe high-speed rolling composite equipment of the present application is flush with the rolling flat section;

[0040] Figure 15 The convex corrugation schematic diagram of the wave flat roller sleeve and the outer edge of the convex corrugation of the seamless metal composite pipe high-speed rolling composite equipment of the present application is higher than the outer surface of the rolling flat section;

[0041] Figure 16 The figure shows the appearance of the seamless metal composite pipe after rolling when the outer edge of the convex corrugation of the wave flat roller sleeve of the high-speed rolling composite equipment of the seamless metal composite pipe of the present application is higher than the rolling flat section.

[0042] Main reference signs:

[0043] 1, transmission system; 2, frame; 3, screwdown system; 4, gradient internal cooling corrugated roller system; 401, wave flat roller sleeve; 4011, biting section; 4012, corrugated section; 40121, convex corrugation; 4013, rolling flat section; 4014, expanding diameter section; 402, roller core; 4021, first water inlet through hole; 4022, annular water cooling groove; 4023, water delivery groove; 4024, first water return through hole; 403, cooling core rod; 4031, outer cooling core tube; 4032, inner cooling core tube; 4033, first blocking ring; 4034, second blocking ring; 4035, second water inlet through hole; 4036, second water return through hole; 4037, booster ring; 404, rotary joint; 5, online gradient heating device; 6, core rod conveying system; 601, core rod trolley; 602, water-cooled core rod; 7, finished seamless metal composite pipe; 701, straight composite interface; 702, microscopic corrugated composite interface. DETAILED DESCRIPTION

[0044] To fully understand the technical content, purposes and effects of the present application, the following will be described in detail in combination with the drawings of the specification.

[0045] The present application provides a high-speed rolling composite equipment for a seamless metal composite pipe, as shown in the figure, which comprises a transmission system 1, a frame 2, a screwdown system 3, a gradient internal cooling corrugated roller system 4, an online gradient heating device 5 and a core rod conveying system 6. Figures 1 to 16

[0046] The gradient internal cooling corrugated roller system 4 comprises a wave flat roller sleeve 401, a roller core 402, a cooling core rod 403 and a rotary joint 404, the wave flat roller sleeve 401 is sleeved on the outer circle of the roller core 402, the cooling core rod 403 is installed on the inner circle of the roller core 402, and the rotary joint 404 is fixedly installed on the end of the cooling core rod 403 away from the roller core 402.

[0047] The wave flat roller sleeve 401 comprises a biting section 4011, a corrugated section 4012, a rolling flat section 4013 and an expanding diameter section 4014 arranged in sequence along the rolling axis direction, and the corrugated section 4012 is provided with a convex corrugation on the inlet side; the wave height of the convex corrugation of the corrugated section 4012 is:

[0048] ;

[0049] wherein, X x represents the horizontal coordinate of the center of the convex corrugation, with the unit of mm.​α represents the rolling angle, unit: °; L represents the width of the convex corrugation, unit: mm; y 3 is the wave height of the convex corrugation, unit: mm; y 2 is the center longitudinal coordinate, unit: mm; y 1 is the center longitudinal radius, unit: mm.

[0050] The wave height of the convex corrugation of the corrugation section is regulated to realize the space composite interface morphology control of the seamless metal composite pipe.

[0051] The roller core 402 includes a first water inlet through hole 4021, an annular water cooling groove 4022, a water conveying groove 4023 and a first water return through hole 4024. The outer surface of the roller core 402 is provided with a plurality of annular water cooling grooves 4022 and a plurality of transversely arranged water conveying grooves 4023 along the axial direction. The first water inlet through hole 4021 is located at the corresponding position of the corrugation section 4012 of the wave flat roller sleeve 401, and the first water inlet through hole 4021 is uniformly distributed on the middle annular water cooling groove 4022 around the axial center line of the roller core 402. A plurality of first water return through holes 4024 are arranged on both sides of the first water inlet through hole 4021 along the axial direction, and the plurality of first water return through holes 4024 are uniformly distributed on the two annular water cooling grooves 4022 around the axial center line of the roller core 402.

[0052] The cooling core rod 403 includes an outer cooling core pipe 4031, an inner cooling core pipe 4032, a first blocking ring 4033 and a second blocking ring 4034. The cooling core rod 403 is provided with a second water inlet through hole 4035 at the axial corresponding position of the first water inlet through hole 4021. The second water inlet through hole 4035 is uniformly distributed around the axial center line of the cooling core rod 403. The first blocking ring 4033 and the second blocking ring 4034 are respectively arranged on both sides of the second water inlet through hole 4035. The outer cooling core pipe 4031 is provided with a second water return through hole 4036 at the axial corresponding position of the first water return through hole 4024.

[0053] The rotary joint 404 is connected with the outer cooling core pipe 4031 and the inner cooling core pipe 4032 respectively.

[0054] The core rod conveying system 6 includes a core rod trolley 601 and a water-cooled core rod 602. The water-cooled core rod 602 is fixed on the core rod trolley 601.

[0055] The upper end of the second water inlet through hole 4035 is provided with a booster ring 4037, and the booster ring 4037 is arranged between the first blocking ring 4033 and the second blocking ring 4034.

[0056] The second water inlet through hole 4035 and the first water inlet through hole 4021 are radially and one-to-one corresponding. The second water inlet through hole 4035 penetrates the outer cooling core pipe 4031 and the inner cooling core pipe 4032, and the second water return through hole 4036 penetrates the outer cooling core pipe 4031.

[0057] The distribution interval of the annular water cooling groove 4022 on both sides decreases in turn or the diameter of the first water inlet hole 4021 on the annular water cooling groove 4022 increases in turn, with the annular water cooling groove 4022 at the position corresponding to the corrugated section 4012 as the center.

[0058] The first water outlet hole 4024 and the first water inlet hole 4021 are arranged in a staggered manner along the circumference of the roller core 402 and penetrate the roller core 402.

[0059] The water delivery groove 4023 penetrates each group of annular water cooling grooves 4022 along the axis of the roller core 402.

[0060] In another aspect, the application also provides a seamless metal composite pipe high-speed rolling composite method of a seamless metal composite pipe high-speed rolling composite device, which comprises the following steps:

[0061] S1, online gradient heating: preparing a preformed composite blank, penetrating a water-cooled mandrel that has been started to cool into the preformed composite blank through a mandrel conveying system, sending the preformed composite blank into an online gradient heating device by a mandrel trolley to perform gradient temperature control heating on the surface layer of the preformed composite blank, when the preformed composite blank completes heating and leaves the online gradient heating device, the outer pipe material, the inner pipe material and the surface to be compounded are heated to the target gradient temperature, under the cooling action of the water-cooled mandrel, a temperature gradient ΔT is formed between the temperature of the outer pipe material and the temperature of the inner pipe material, and a preformed composite blank with a temperature gradient ΔT is obtained.

[0062] S2, high-speed wave flattening rolling: setting the target pass size of the high-speed rolling composite device, starting the high-speed rolling composite device, injecting circulating cooling water into the gradient internal cooling wave roller system, and rolling the preformed composite blank with the temperature gradient ΔT to realize gradient cooling to both sides of the wave section, so that the temperature of the gradient internal cooling wave roller system is uniformly distributed, the preformed composite blank sequentially passes through the biting-in section, the wave section, the flattening section and the expanding section, and as the diameter of the preformed composite blank gradually decreases, the wall thickness gradually thins, the metallurgical bonding of the composite interface is realized, and a rough rolling seamless metal composite pipe is obtained, which is sent out by the conveying track.

[0063] S3, finishing the finished product into the warehouse: after the rough rolling seamless metal composite pipe passes through the sizing and finishing process, the diameter is reduced, the wall thickness is thinned, the metallurgical bonding of the composite interface is strengthened, the target finished product size is reached, the final rolling seamless metal composite pipe is obtained, the head and tail are removed for size cutting, and after heat treatment, the target comprehensive performance of the component metal and the composite interface is reached, the finished seamless metal composite pipe is obtained, and is packaged into the warehouse.

[0064] The outer edge of the convex corrugation of the wave section is lower than, flush with or higher than the outer surface of the flattening section. Specific embodiments:

[0066] This invention provides a high-speed rolling composite equipment for seamless metal composite tubes, such as... Figure 1 As shown, it includes a transmission system 1, a frame 2, a pressing system 3, a gradient internal cooling corrugated roller system 4, an online gradient heating device 5, and a mandrel conveying system 6.

[0067] A schematic diagram of the gradient internal cooling corrugated roller system assembly is shown below. Figure 2 As shown, combined with Figure 3 The schematic cross-sectional view of the gradient internally cooled corrugated roll system shown is shown. The gradient internally cooled corrugated roll system 4 includes a corrugated roll sleeve 401, a roll core 402, a cooling core rod 403, and a rotary joint 404. The corrugated roll sleeve 401 is fitted around the outer ring of the roll core 402, and the cooling core rod 403 is installed on the inner ring of the roll core 402. During the rolling process, the corrugated roll sleeve 401, the roll core 402, and the cooling core rod 403 rotate together. The rotary joint 404 is fixedly installed at the end away from the roll core 402, and its interior is connected to the outer cooling core tube 4031 and the inner cooling core tube 4032, respectively, for supplying and returning water to the gradient internally cooled corrugated roll system.

[0068] like Figure 4 As shown, the corrugated roll sleeve 401 directly contacts the pre-made composite billet during the rolling process. It includes a bite section 4011, a corrugated section 4012, a flattening section 4013, and an expansion section 4014 arranged sequentially along the rolling axis. A raised corrugation 40121 is provided on the inlet side of the corrugated section 4012. The outer edge of the raised corrugation 40121 of the corrugated section 4012 can be lower than, flush with, or higher than the outer surface of the flattening section 4013. By adjusting the wave height of the raised corrugation 40121 of the corrugated section 4012, a micro-corrugated interface or a macro-corrugated interface can be obtained at the spatial composite interface of the seamless metal composite tube, so as to achieve precise control of the morphology of the spatial composite interface of the seamless metal composite tube.

[0069] like Figure 5 and Figure 6 As shown, the roller core 402 includes a first water inlet hole 4021, an annular water cooling groove 4022, a water conveying groove 4023, and a first water return hole 4024. Multiple sets of annular water cooling grooves 4022 are provided axially on the surface of the roller core 402. The first water inlet hole 4021 is located at the corresponding position of the corrugated section 4012 of the corrugated roller sleeve 401, and the first water inlet holes 4021 are evenly distributed around the axial centerline of the roller core 402 on the central annular water cooling groove 4022. The first water inlet holes 4021 are located on both sides of the first water inlet hole 4021. Multiple sets of first return water through holes 4024 are provided along the axial direction. The first return water through holes 4024 are evenly distributed on the annular water cooling grooves 4022 on both sides around the axial center line of the roller core 402. In this way, the annular water cooling grooves 4022 connect the first water inlet through hole 4021 and the first return water through hole 4024. Multiple sets of water conveying grooves 4023 are provided along the axial direction on the surface of the roller core 402. The water conveying grooves 4023 penetrate each set of annular water cooling grooves 4022 and are used to connect and connect each set of annular water cooling grooves 4022.

[0070] Furthermore, the first return water through hole 4024 and the first inlet water through hole 4021 penetrate the roller core 402 and are arranged alternately along the circumference of the roller core 402. This can increase the time that cooling water flows in the corrugated roller sleeve 401 and absorb more heat.

[0071] With the annular water cooling groove 4022 at the position corresponding to the corrugated section 4012 as the center, as the distance from the middle annular water cooling groove 4022 is increased, the distribution spacing of the two annular water cooling grooves 4022 gradually decreases or the diameter of the first water inlet hole 4021 on the two annular water cooling grooves 4022 gradually increases. This can increase the cooling water flow at the position of the two annular water cooling grooves and avoid the situation where the surface of the corrugated roller sleeve 401 is uneven due to the cooling water absorbing heat and flowing in the corrugated roller sleeve 401.

[0072] like Figure 7 As shown, the cooling core rod 403 includes an outer cooling core tube 4031, an inner cooling core tube 4032, a first retaining ring 4033, and a second retaining ring 4034. The cooling core rod 403 has a second water inlet hole 4035 at the axial corresponding position of the first water inlet hole 4021. The second water inlet holes 4035 are evenly distributed around the axial center line of the cooling core rod 403. The second water inlet holes 4035 and the first water inlet holes 4021 are arranged radially in a one-to-one correspondence. This can reduce the pressure loss when the cooling water flows from the second water inlet hole 4035 into the first water inlet hole 4021. The first retaining ring 4033 and the second retaining ring 4034 are respectively arranged on both sides of the second water inlet hole 4035 to isolate the cooling water. The outer cooling core tube 4031 has a second water return hole 4036 at the axial corresponding position of the first water return hole 4024.

[0073] Furthermore, the second water inlet hole 4035 penetrates the outer cooling core tube 4031 and the inner cooling core tube 4032, and the second water return hole 4036 penetrates the outer cooling core tube 4031.

[0074] A pressure boosting ring 4037 is provided at the upper end of the second water inlet hole 4035, and the pressure boosting ring 4037 is located between the first retaining ring 4033 and the second retaining ring 4034. It is used to increase the pressure of the cooling water sprayed from the second water inlet hole 4035, reduce the time of cooling water circulation in the corrugated roller sleeve 401, and improve heat dissipation efficiency.

[0075] like Figure 8 As shown, the mandrel conveying system 6 includes a mandrel carriage 601 and a water-cooled mandrel 602. The water-cooled mandrel 602 is fixed on the mandrel carriage 601 and is used to drive the water-cooled mandrel 602 to move back and forth along the rolling axis. During rolling, the pre-made composite billet is placed on the water-cooled mandrel 602. The water-cooled mandrel 602 reduces the temperature of the mandrel by internal circulating cooling water, thereby cooling the pre-made composite billet.

[0076] A schematic diagram of the 401 corrugated roller sleeve is shown below. Figure 9 As shown, when the shape of the raised corrugation 40121 of the corrugated segment 4012 is an arc, the width along the axial direction is set to... L The unit is mm. The main dimensional parameters of the raised corrugated 40121 include the following:

[0077] Rolling angle (°): α

[0078] x-coordinate of the center (mm): X

[0079] Center coordinate (mm): ;

[0080] Circle radius (mm): ;

[0081] The corrugated section 4012 of the corrugated roller sleeve 401, and the corrugation height (mm) of the raised corrugations 40121:

[0082] .

[0083] when L When the diameter is 5mm, the relationship between the dimensions of the raised corrugations 40121 and the abscissa of the center of the corrugated roller sleeve 401 is obtained through the above calculations, as shown in the figure. Figure 10 As shown in the figure, when the structural dimensions of the roll are constant, the height of the flattening section is constant, while the corrugation height decreases as the horizontal coordinate of the corrugation center increases. Therefore, when the flattening section height curve and the corrugation height curve intersect, that is, when the corrugations are aligned with the flattening section, the height of the flattening section is reached. X =2.77mm, and to the left of the dividing line, the corrugation height is greater than the rolling section height, that is, the corrugation is higher than the rolling section, while to the right of the dividing line, the corrugation height is less than the rolling section height, that is, the corrugation is lower than the rolling section.

[0084] like Figure 11 As shown, the outer edge of the raised corrugations 40121 of the corrugated roll sleeve 401 is lower than the rolling flat section. At this time, the morphology of the finished seamless metal composite tube 7 rolled and composite by the high-speed rolling composite equipment is as follows. Figure 12 As shown, the macroscopic structure is a flat composite interface 701, and a micro-wave composite interface 702 can be observed by magnifying a portion of the flat composite interface 701.

[0085] like Figure 13 As shown, the outer edge of the raised corrugations 40121 of the corrugated roll sleeve 401 is flush with the rolling section. At this time, the morphology of the finished seamless metal composite tube 7 rolled and composite by the high-speed rolling composite equipment is as follows. Figure 14 As shown, a macroscopic ripple composite interface can be obtained.

[0086] As Figure 15 shown, the outer edge of the convex corrugation 40121 of the wave flattening roller sleeve 401 is higher than the flattening section, at this time, the appearance of the finished seamless metal composite pipe 7 rolled and compounded by the high-speed rolling compounding equipment is as Figure 16 shown, the macro corrugated composite interface can be obtained, and the outer surface corrugation of the seamless metal composite pipe is not flattened, showing a corrugated shape.

[0087] The following describes a high-speed rolling compounding method of a seamless metal composite pipe high-speed rolling compounding equipment of the present application in combination with an embodiment:

[0088] S1, online gradient heating: prepare the pre-compounded blank, pass the water-cooled mandrel 602 that has been started to cool into the pre-compounded blank through the mandrel conveying system 6, and send it into the online gradient heating device 5 by the mandrel trolley 601 to perform gradient temperature control heating on the surface layer of the pre-compounded blank. When the pre-compounded blank completes heating and leaves the online gradient heating device 5, the outer pipe material, the inner pipe material, and the surface to be compounded are heated to the target gradient temperature. Under the cooling action of the water-cooled mandrel 602, a stable temperature gradient ΔT is formed between the temperature of the outer pipe material and the temperature of the inner pipe material.

[0089] S2, high-speed wave flattening rolling: set the target pass size of the high-speed rolling compounding equipment, start the high-speed rolling compounding equipment, and inject circulating cooling water through the rotary joint 404 in the gradient internal cooling corrugated roller system 4. The cooling water first enters the internal cooling core pipe 4032 and is sprayed out from the second water inlet hole 4035, then flows into the first water inlet hole 4021 corresponding to the second water inlet hole 4035 after increasing the water pressure through the booster ring 4037 under the blockage of the first blocking ring 4033 and the second blocking ring 4034, and then the cooling water flows into the annular water cooling groove 4022 arranged at the position of the first water inlet hole 4021. The annular water cooling groove 4022 in the full water state sufficiently absorbs the heat generated during rolling, and finally the cooling water in the annular water cooling groove 4022 flows out to the outer cooling core pipe 4031 through the first water outlet hole 4024 and the second water inlet hole 4035, and then flows out along the outer cooling core pipe 4031 to the rotary joint 404 to realize water return. In this way, the cooling water continuously circulates in the gradient internal cooling corrugated roller system 4 to take away the heat generated during rolling to achieve the cooling effect.

[0090] The preformed composite blank with temperature gradient ΔT is rolled and compounded, gradient cooling is carried out to both sides of the corrugated section 4012, the temperature of the gradient inner cooling corrugated roller system 4 is uniformly distributed, the preformed composite blank passes through the biting section, the corrugated section, the flattening section and the expanding section in turn, under the joint action of the gradient inner cooling corrugated roller system 4 and the water-cooled mandrel 602, the heat generated by the severe plastic deformation is absorbed, the preformed composite blank has a stable temperature gradient ΔT, the deformation resistance of the component metal is controlled through the temperature gradient ΔT, the axial extension of the component metal is uniform, deformation is easy to coordinate, and the situation that a large amount of intermetallic compounds is generated due to the temperature rise of the preformed composite blank to reduce the bonding strength of the composite interface is avoided, with the gradual reduction of the diameter of the preformed composite blank and the gradual thinning of the wall thickness, the composite interface is metallurgically combined, the as-rolled seamless metal composite pipe is obtained, and the as-rolled seamless metal composite pipe is sent out by the conveying track.

[0091] S3, the finished product is stored: after the as-rolled seamless metal composite pipe passes through the sizing and finishing processes, the diameter is reduced, the wall thickness is thinned, the composite interface is metallurgically combined, the target product size is reached, the as-finished seamless metal composite pipe is obtained, after the head and tail are removed, the sizing cutting is carried out, after the heat treatment, the target comprehensive performance of the component metal and the composite interface is obtained, the finished seamless metal composite pipe is obtained, and the finished seamless metal composite pipe is packaged and stored.

[0092] The above-described embodiments only describe the preferred embodiments of the present application, and do not limit the scope of the present application, and various modifications and improvements to the technical solutions of the present application made by those skilled in the art without departing from the design spirit of the present application shall fall within the protection scope of the present application.

Claims

1. A seamless metal composite pipe high speed rolling composite apparatus characterized by: It includes transmission system (1), rack (2), press-down system (3), gradient internal cooling corrugated roller system (4), online gradient heating device (5) and mandrel conveying system (6); The gradient internal cooling corrugated roller system (4) comprises a wave flat roller sleeve (401), a roller core (402), a cooling core rod (403) and a rotary joint (404), the wave flat roller sleeve (401) is sleeved on the outer circle of the roller core (402), the cooling core rod (403) is installed on the inner circle of the roller core (402), and the rotary joint (404) is fixedly installed on the end of the cooling core rod (403) away from the roller core (402); The wave flat roller sleeve (401) comprises a bite-in section (4011), a corrugated section (4012), a flattening section (4013) and a diameter expansion section (4014) arranged in sequence along the rolling axis direction, and the corrugated section (4012) is provided with convex corrugations at the inlet side; The wave height of the convex corrugations of the corrugated section is adjusted to realize the space composite interface morphology control of the seamless metal composite pipe; The roller core (402) comprises a first water inlet through hole (4021), an annular water cooling groove (4022), a water conveying groove (4023) and a first water return through hole (4024), the outer surface of the roller core (402) is provided with a plurality of annular water cooling grooves (4022) and a plurality of transversely arranged water conveying grooves (4023) along the axial direction, the first water inlet through hole (4021) is located at the corresponding position of the corrugated section (4012) of the wave flat roller sleeve (401), and the first water inlet through hole (4021) is uniformly distributed on the middle annular water cooling groove (4022) around the axial center line of the roller core (402), a plurality of first water return through holes (4024) are arranged on the two sides of the first water inlet through hole (4021) along the axial direction, and the plurality of first water return through holes (4024) are uniformly distributed on the two side annular water cooling grooves (4022) around the axial center line of the roller core (402); The cooling core rod (403) comprises an outer cooling core pipe (4031), an inner cooling core pipe (4032), a first blocking ring (4033) and a second blocking ring (4034), the cooling core rod (403) is provided with a second water inlet through hole (4035) at the axial corresponding position of the first water inlet through hole (4021), the second water inlet through hole (4035) is uniformly distributed around the axial center line of the cooling core rod (403), the first blocking ring (4033) and the second blocking ring (4034) are respectively arranged on the two sides of the second water inlet through hole (4035), and the outer cooling core pipe (4031) is provided with a second water return through hole (4036) at the axial corresponding position of the first water return through hole (4024); The rotary joint (404) is connected with the outer cooling core pipe (4031) and the inner cooling core pipe (4032) respectively; The mandrel conveying system (6) comprises a mandrel trolley (601) and a water-cooled mandrel (602), and the water-cooled mandrel (602) is fixed on the mandrel trolley (601).

2. A high speed rolling pipe mill for seamless metal composite pipes according to claim 1, characterized in that: The wave height of the convex corrugations of the corrugated section (4012) is: ； wherein X represents the horizontal coordinate of the center of the raised corrugation in mm; α represents the rolling angle in °; L represents the width of the raised corrugation in mm; y 3 represents the height of the raised corrugation in mm; y 2 represents the vertical coordinate of the center in mm; y 1 represents the vertical radius of the center in mm.

3. A high speed rolling pipe mill for seamless metal composite pipe as claimed in claim 1, wherein: The upper end of the second water inlet through hole (4035) is provided with a booster ring (4037), and the booster ring (4037) is arranged between the first blocking ring (4033) and the second blocking ring (4034).

4. A high speed rolling pipe mill for seamless metal composite pipe as claimed in claim 1, wherein: The second water inlet through hole (4035) and the first water inlet through hole (4021) are arranged in one-to-one correspondence in the radial direction, the second water inlet through hole (4035) penetrates the outer cooling core pipe (4031) and the inner cooling core pipe (4032), and the second water outlet through hole (4036) penetrates the outer cooling core pipe (4031).

5. A high speed rolling pipe mill for seamless metal composite pipe as claimed in claim 1, wherein: The annular water cooling groove (4022) is taken as the center at the position corresponding to the corrugated section (4012), the distribution intervals of the annular water cooling grooves (4022) on both sides are sequentially reduced, or the diameters of the first water inlet through holes (4021) on the annular water cooling grooves (4022) on both sides are sequentially increased.

6. A high speed rolling pipe mill for seamless metal composite pipe as claimed in claim 1, wherein: The first water outlet through hole (4024) and the first water inlet through hole (4021) are arranged in a circumferential staggered manner along the roller core (402) and penetrate the roller core (402).

7. A high speed rolling pipe mill for seamless metal composite pipe as claimed in claim 1, wherein: The water conveying groove (4023) penetrates each group of annular water cooling grooves (4022) in the axial direction of the roller core (402).

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