A rolling mill production line for rare and refractory metal strips and a production method thereof

Abstract

The present invention discloses a rolling mill production line for rare and refractory metal plates and strips and a production method thereof, comprising a transport roller for transporting rare and refractory metal plates and strips and a rolling mill body arranged in the middle of the transport roller, wherein the transport roller is provided with a feeding device, a shearing machine 1, a leveling machine 1, a roller heating furnace, a billet heating furnace, a quick cooling system, an online supplementary heat furnace, a leveling machine 2, a shearing machine 2, and a coiler in sequence along its length direction. Beneficial effects: The co-linear rolling mill production line described in the present invention has the following advantages: 1. The process is highly targeted, the functions are diverse, the configuration is perfect, and the layout is reasonable and compact, which not only reduces the equipment investment, but also improves the equipment utilization rate. 2. Metal plates and strips of different alloy types can be produced simultaneously on one production line, which effectively improves the production efficiency and capacity of the equipment, reduces the auxiliary production time, and reduces energy consumption.

Description

Technical Field

[0001] The invention relates to the field of production of rare and refractory metal plates and strips, and in particular to a rolling mill production line for rare and refractory metal plates and strips and a production method thereof. Background Art

[0002] With the rapid development of metallurgical equipment design technology and material processing technology, especially the rapid progress and improvement of metal plate and strip rolling production technology and equipment design, metal plates and strips have increasingly higher requirements for hot and warm rolling equipment and technology.

[0003] Rare and refractory metal plates and strips generally include: tungsten (W), molybdenum (Mo) and its alloy plates and strips, titanium (Ti), nickel (Ni) and its alloy plates and strips, magnesium (Mg) alloy plates and strips, special steel (0Cr26Ni5Mo2, etc.) and stainless steel (304, etc.) plates and strips, high-temperature alloys (GH4065, etc.) plates and strips, functional materials (1J22, etc.) plates and strips, and the newly developed powder sintering metal-based materials such as aluminum-based neutron absorption plates, high-microalloyed high-strength copper alloys and hard aluminum alloys. The biggest problem encountered in the production of the above rare and refractory metal plates and strips is the narrow thermal deformation temperature range and high metal deformation resistance. During the processing, one, two, three, etc., multiple heat supplements are required. Some metals even need to be supplemented with heat once for each rolling pass. At the same time, due to the differences in the heating methods, heating times, recrystallization types and recrystallization times of different types of rare and refractory metal plates and strips, the heating has a great impact on the production rhythm and capacity of the rolling mill production line. In particular, the time when the rolling mill is on standby waiting for billets will be much longer than the production time. For example, the rolling time of plates and strips is generally less than 5 minutes, while the standby time is at least 30 to 120 minutes. The above situation brings great difficulties to the design of refractory metal rolling mill production lines.

[0004] On the other hand, rare and refractory metals generally have the production characteristics of multiple specifications, multiple varieties and small batches. Their rolling mills should not only be able to produce thick plates, but also have the ability to produce thin strips and coils. In addition, thick plates and thin strips should use the metal waste heat on the rolling mill to carry out online straightening, finishing, online shearing and other processes. At the same time, due to the different types of metals, some rare and refractory metals do not need rapid cooling after rolling, and can be slowly cooled in the air; some rare and refractory metals need to be cooled by spraying cooling water, emulsion, etc. to control the metal structure and properties; some rare and refractory metals cannot be exposed to water and emulsion, so they can only be sprayed with oil or purged with cold air to achieve the purpose of rapid cooling. However, the current configuration types of rare and refractory metal plate and strip rolling mills at home and abroad cannot meet all the above process requirements, while the rolling mills for ordinary metals such as ordinary carbon steel are set up on the back side of a single rolling mill body for the production of plates and strips. Due to the different metal production processes, the production of rare and refractory metal plates and strips cannot be carried out according to the conventional rolling mill layout. At the same time, there is currently no rapid cooling system with interchangeable cooling media in the field of rare and refractory metals. Some manufacturers use two or even more rolling mills to meet the production process, but for small batches, multiple specifications, and multiple varieties of rare and refractory metal plates and strips, the equipment utilization rate is too low and the equipment construction investment is too high, which does not meet the technical characteristics and process requirements of this production field. Therefore, some rare and refractory metal manufacturers entrust production to external companies to carry out strip processing of some processes, and this model reduces the competitiveness of enterprises and products, and cannot fundamentally solve production technology problems.

[0005] In addition, due to the differences in production processes and the lack of innovation in the design and production process concepts of rolling mill production lines, up to now, there has been no rolling production line in the metallurgical industry that can simultaneously produce multiple metal varieties and corresponding multi-specification plates and strips. The industry can only rely on increasing the number of rolling mill production lines to solve production problems, which leads to disadvantages such as low equipment utilization of a single production line, unreasonable equipment selection, and excessive total investment in the production line.

[0006] From the above content, we can see that designing a set of special rolling mills suitable for the production of rare and refractory metal plates and strips, with compact layout, reasonable process technology, diversified functions, perfect configuration, targeted energy saving and consumption reduction, and reduced production line investment has become an urgent problem to be solved in this industry. It is also very important and critical to the rapid and healthy development of the rare and refractory metal industry. Summary of the invention

[0007] The purpose of the present invention is to provide a rolling mill production line for rare and refractory metal plates and strips and a production method thereof in order to solve the above problems, so as to solve the problems that ordinary rolling mill production lines in the prior art cannot produce plates and strips at the same time while fully meeting the production process requirements when producing rare and refractory metal plates and strips, and the equipment waits for too long for billet reheating and recrystallization, resulting in slow production rhythm, low production capacity, imperfect online straightening and shearing functions of the equipment, lack of online adjustment and conversion of different cooling media, and often require two or more devices to complete the production process in actual production, high equipment construction investment, low utilization rate and other problems. The co-linear rolling mill production line provided by the present invention has a reasonable and compact layout, perfect configuration, and diverse functions. It can produce various types of rare and refractory metal plates and strips at the same time, and can effectively solve the current problems that rare and refractory metal plates and strips cannot be produced on the same line and have low production capacity.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] The present invention provides a rolling mill production line for rare and refractory metal plates and strips, comprising a transport roller for transporting rare and refractory metal plates and strips and a rolling mill body arranged in the middle of the transport roller, wherein the transport roller is provided with a feeding device, a shearing machine 1, a leveling machine 1, a roller heating furnace, a billet heating furnace, a rapid cooling system, an online supplementary heating furnace, a leveling machine 2, a shearing machine 2, and a coiler in sequence along its length direction, and the rolling mill body is located between the billet heating furnace and the rapid cooling system, and the rare and refractory metal plates and strips can be transported to any equipment among the feeding device, the shearing machine 1, the leveling machine 1, the roller heating furnace, the billet heating furnace, the rolling mill body, the rapid cooling system, the online supplementary heating furnace, the leveling machine 2, the shearing machine 2, and the coiler through the transport roller.

[0010] As an important design of this case, the online reheating furnace is movably arranged on the transport roller and can move along the length direction perpendicular to the transport roller.

[0011] As an optimized design of this case, the leveling machine is a flat plate press or a seven-roller to thirteen-roller system hot straightening machine.

[0012] As an optimized design of this case, the second leveling machine is a hot-temperature straightening machine of a thirteen-roller to twenty-one-roller system.

[0013] As an optimized design of this case, the shearing thickness of the shearing machine 1 is 10--80mm.

[0014] As an optimized design of this case, the shearing thickness of the second shearing machine is 2-10mm.

[0015] As an optimized design of this case, the rapid cooling system is an injection device with adjustable cooling medium, and the cooling medium injected includes water, emulsion, oil, and cold air.

[0016] In addition, the present invention also proposes a method for producing rare and refractory metal sheets and strips, which uses the rolling mill production line of any of the above rare and refractory metal sheets and strips to perform the following steps:

[0017] Step 1: transporting the rare and refractory metal billets to a billet heating furnace via a conveyor roller for heating;

[0018] Step 2: transporting the heated rare and refractory metal billets to the rolling mill body through a conveyor roller for rolling;

[0019] Step 3: conveying the rolled plate to a roller heating furnace through a conveyor roller for supplementary heating, and conveying the rolled strip to an online supplementary heating furnace through a conveyor roller for supplementary heating;

[0020] Step 4: transport the heated plates and strips to the rapid cooling system through a conveyor roller for high-temperature solution heat treatment and cooling;

[0021] Step 5: conveying the plate after high-temperature solid solution heat treatment and cooling to leveler 1 through a conveying roller for flattening, and conveying the strip after high-temperature solid solution heat treatment and cooling to leveler 2 through a conveying roller for straightening;

[0022] Step 6: The flattened plate is conveyed to shearing machine 1 through a conveying roller to be sheared to a certain size, and the straightened strip is conveyed to shearing machine 2 through a conveying roller to cut off the head and tail of the strip;

[0023] Step 7: The sheared plates are transported to the unloading device through the transport roller for unloading, transportation and stacking. The strip with the head and tail cut off is transported to the coiler through the transport roller for coiling and unloading.

[0024] As an optimized design of this case, the strip that has been supplemented with heat in step three needs to be transported to the rolling mill body for multiple passes of reversible rolling before entering the rapid cooling system for cooling.

[0025] Beneficial effects: The collinear rolling mill production line of the present invention has the following advantages:

[0026] 1. The process is highly targeted, the functions are diverse, the configuration is perfect, and the layout is reasonable and compact, which not only reduces the equipment investment but also improves the equipment utilization rate.

[0027] 2. Metal sheets and strips with different alloy types can be produced simultaneously on one production line, which effectively improves the production efficiency and capacity of the equipment, reduces auxiliary production time, and reduces energy consumption.

[0028] 3. It can adjust and change different cooling media online, effectively meeting the flexible production requirements of multiple varieties, multiple specifications and small batches of rare and refractory metal plates and strips, ensuring that the product size accuracy and organizational performance meet the standards. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 It is a schematic diagram of the layout of a rolling mill production line for rare and refractory metal plates and strips of the present invention.

[0031] The following are the descriptions of the reference numerals:

[0032] 1. Billet heating furnace; 2. Rolling mill body; 3. Roller heating furnace; 4. Leveling machine 1; 5. Shearing machine 1; 6. Unloading device; 7. Quick cooling system; 8. Online reheating furnace; 9. Coiler; 10. Transport roller; 11. Leveling machine 2; 12. Shearing machine 2. DETAILED DESCRIPTION

[0033] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0034] See also Figure 1As shown, the present invention provides a rolling mill production line for rare and refractory metal plates and strips, comprising a transport roller 10 for transporting rare and refractory metal plates and strips and a rolling mill body 2 arranged in the middle of the transport roller 10, on which a feeding device 6, a shearing machine 5, a leveling machine 4, a roller heating furnace 3, a billet heating furnace 1, a fast cooling system 7, an online supplementary heating furnace 8, a leveling machine 11, a shearing machine 12, and a coiler 9 are sequentially arranged along the length direction thereof, and the rare and refractory metal plates and strips can be transported to the feeding device 6, the shearing machine 5, the leveling machine 4, and the coiler 9 through the transport roller 10. , leveling machine 1 4, roller heating furnace 3, billet heating furnace 1, rapid cooling system 7, online supplementary heating furnace 8, leveling machine 2 11, shearing machine 2 12, coiler 9. In the actual production process, the unloading device 6, shearing machine 1 5, leveling machine 1 4, roller heating furnace 3, billet heating furnace 1, rapid cooling system 7, online supplementary heating furnace 8, leveling machine 2 11, shearing machine 2 12, coiler 9 will not be fully put into use. Instead, some of the equipment will be selectively involved in the actual production process according to the rare and refractory plates and strips produced; for example, when producing a metal When producing plates, only the billet heating furnace 1, the rolling mill body 2, the roller heating furnace 3, the rapid cooling system 7, the leveler 4, the shearing machine 5 and the unloading device 6 are put into use, and the finished plates are unloaded from the unloading device 6; when producing two kinds of rare and refractory metal plates at the same time, the billet heating furnace 1, the rolling mill body 2, the roller heating furnace 3, the rapid cooling system 7, the leveler 4, the shearing machine 5 and the unloading device 6 are put into use, and the online supplementary heating furnace 8 can be put into use or not, and the finished plates are unloaded from the unloading device 6; when producing one rare and refractory metal plate When melting metal strip, only the billet heating furnace 1, the rolling mill body 2, the online supplementary heating furnace 8, the rapid cooling system 7, the leveling machine 11, the shearing machine 12, and the coiler 9 are put into use, and the roller heating furnace 3 can be put into use or not, and the finished product is produced from the coiler 9; when one or two metal plates and one metal strip are produced at the same time, the unloading device 6, the shearing machine 5, the leveling machine 4, the roller heating furnace 3, the billet heating furnace 1, the rapid cooling system 7, the online supplementary heating furnace 8, the leveling machine 11, the shearing machine 12, and the coiler 9 are all put into use. The final finished plate rolls off the line from the unloading device 6, and the finished strip rolls off the line from the coiler 9; the above design method does not need to invest a lot of cost to arrange multiple production lines to complete the production process of various plates and strips like traditional rolling mill production lines. The process is highly targeted and effectively saves the investment cost of the production line. The equipment utilization rate on the production line is high, the functions are diverse, the configuration is complete, the layout is reasonable and compact, and it is flexible and convenient. It effectively meets the needs of simultaneous co-production of various rare and refractory metal plates and strips, and significantly improves production efficiency and capacity.

[0035] The unloading device 6 is used for lifting, transversely moving off-line and stacking rare and refractory metal plates and strips; the coiler 9 is used for coiling, transversely moving off-line and storing rare and refractory metal plates and strips; the transport roller 10 is used for conveying and transporting the billets.

[0036] The roller heating furnace 3 is installed directly above the transport roller 10. The rare and refractory metal plates and strips pass through the roller heating furnace 3 via the transport roller 10. This design can not only provide supplementary heat to the rare and refractory metal plates and strips, but also does not affect the movement of the rare and refractory metal plates and strips on the transport roller 10. Most of the working time of the roller heating furnace 3 during production is concentrated within 60 minutes.

[0037] The online supplementary heating furnace 8 is movably arranged on the transport roller 10 and can move along the length direction perpendicular to the transport roller 10. With this design, when the rare and refractory metal plates and strips enter the online supplementary heating furnace 8 through the transport roller 10, the online supplementary heating furnace 8 drives the rare and refractory metal plates and strips to leave the transport roller 10 for supplementary heating. Because the working time of the online supplementary heating furnace 8 during production is 60~720 minutes, which is a long time, in order not to affect the movement of the rare and refractory metal plates and strips on the transport roller 10 to the fast cooling system for high-temperature solid solution heat treatment and cooling treatment, the online supplementary heating furnace 8 is specially designed to be sliding.

[0038] The billet heating furnace 1 is used for the production of billets in a cold state of 5-150°C.

[0039] The roller heating furnace 3 and the online supplementary heating furnace 8 are used for the production of billets in a hot temperature state of 150-1250°C.

[0040] The quick cooling system 7 is an adjustable cooling medium injection device, which can realize the switching between the injection cooling medium water, emulsion, oil, cold air, etc., to meet the flexible production requirements of different rare and refractory metals with multiple varieties, multiple specifications and small batches, while ensuring that the product dimensional accuracy and organizational performance are not reduced. For example, when producing tungsten (W), molybdenum (Mo), magnesium (Mg), aluminum-based neutron absorption plates and other plate and strip materials, the quick cooling system uses oil and cold air as the process medium for cooling or heat treatment. When producing titanium (Ti), nickel (Ni), special steel (0Cr26Ni5Mo2, etc.), stainless steel (304, etc.), high temperature When cooling or heat treating alloys (GH4065, etc.), functional materials (1J22, etc.), high-microalloyed high-strength copper alloys and hard aluminum alloy plates and strips, the rapid cooling system uses water and emulsion as the process medium for cooling or heat treatment. In order to achieve rapid switching between the above-mentioned different cooling media, the injection device should include multiple oil pumps, air pumps or water pumps. The oil pump is used to pump emulsion and oil, the water pump is used to pump water, and the air pump is used to pump cold air. Multiple oil pumps, air pumps or water pumps are connected to the solenoid valve through a pipeline, and the solenoid valve is connected to the nozzle of the injection device through a pipeline. The nozzle is controlled by controlling the solenoid valve to spray different cooling media.

[0041] The leveling machine 1 4 is a flat plate press or a hot straightening machine of a seven-roller to thirteen-roller system; the leveling machine 2 11 is a hot-temperature straightening machine of a thirteen-roller to twenty-one-roller system.

[0042] The shearing thickness of shearing machine 1 5 is 10~80mm; the shearing thickness of shearing machine 2 12 is 2~10mm.

[0043] The rolling mill body 2 is located between the billet heating furnace 1 and the rapid cooling system 7 .

[0044] In addition, the present invention also proposes a method for producing rare and refractory metal sheets and strips, which uses the rolling mill production line of any of the above rare and refractory metal sheets and strips to perform the following steps:

[0045] Step 1: transport the rare and refractory metal billets to the billet heating furnace 1 for heating via the transport roller 10; in the actual production process, the rare and refractory metal billets with a short heating time are generally placed in the billet heating furnace 1 for heating first, so that the billets heated first can be processed while the rare and refractory metal billets with a longer heating time are heated, without affecting each other, effectively saving time and improving production efficiency and capacity.

[0046] Step 2: The heated rare and refractory metal billets are transported to the rolling mill body 2 through the transport roller 10 for rolling; since different rare and refractory metal billets are heated in sequence and for different heating times in step 1, the subsequent rolling is also carried out on a first-come-first-served basis. In actual use, the heating time and heating sequence of the rare and refractory metal billets in the billet heating furnace 1 can be reasonably arranged according to production conditions, so that the subsequent rolling can be smooth and orderly, and there will be no situation where the billets are waiting for rolling, and there will be no problem of the billets being blocked on the transport roller 10.

[0047] Step 3: convey the rolled plate to the roller heating furnace 3 through the transport roller 10 for supplementary heating, and convey the rolled strip to the online supplementary heating furnace 8 through the transport roller 10 for supplementary heating. The supplementary heating time of the plate is short, and the length of the roller heating furnace 3 can be designed to be long enough, so the plate has basically been supplemented with heat after passing through the roller heating furnace 3, which will not affect the subsequent supplementary heating of the plate. As the supplementary heating time of the strip is long, in order not to affect the plate passing through the transport roller 10 to the quick cooling system 7, the online supplementary heating furnace 8 will perform supplementary heating after driving the strip to leave the transport roller 10;

[0048] Step 4: transport the reheated plates and strips to the rapid cooling system 7 via the transport roller 10 for high-temperature solution heat treatment and cooling; since the reheating time of the strips and plates is different, as long as the production sequence is arranged reasonably, the problem of the plates and strips entering the rapid cooling system 7 at the same time will not occur.

[0049] Step 5: The plate after high-temperature solid solution heat treatment and cooling is transported to the leveler 1 4 through the transport roller 10 for flattening, and the strip after high-temperature solid solution heat treatment and cooling is transported to the leveler 2 11 through the transport roller 10 for straightening;

[0050] Step 6: The flattened plate is transported to the shearing machine 1 5 through the transport roller 10 for sizing, and the straightened strip is transported to the shearing machine 2 12 through the transport roller 10 to cut off the head and tail of the strip;

[0051] Step 7: The sheared plates are transported to the unloading device 6 through the transport roller 10 for unloading, transportation and stacking, and the strip with the head and tail cut off is transported to the coiler 9 through the transport roller 10 for coiling and unloading.

[0052] The strip that has been supplemented with heat in step 3 needs to be transported to the rolling mill body 2 for multiple passes of reversible rolling before entering the rapid cooling system 7 for cooling, until it is rolled to the specified specifications.

[0053] Take the production of tungsten (W) plate as an example. The thickness of the plate product is 10mm. The production steps are as follows:

[0054] 1. The W-plate billet with a specification of 60×900×900mm heated to 1830℃ in the billet heating furnace 1 is transported to the rolling mill body 2 through the transport roller 10 and rolled to a specification of 32×1050×1446mm. It then enters the roller heating furnace 3 for supplementary heating, and the supplementary heating time is 15 minutes.

[0055] 2. After the W billet has completed the 15-minute reheating process in the roller heating furnace 3, it is taken out of the furnace for multi-pass reversible rolling of the rolling mill body 2. After being rolled to a specification of 10×1200×4050mm, it is transferred to the quick cooling system 7 on the rear side of the machine through the transport roller 10. The quick cooling system 7 sprays cold air to cool it.

[0056] 3. The W billet, which has been rapidly cooled by cooling air, is conveyed to the leveler 4 by the conveying roller 10 for flattening, and then cut into two plates with a length of 2000, a thickness of 10mm, and a width of 1200mm by the shearing machine 5. Finally, the W plates are unloaded, transported, and stacked by the unloading device 6 to complete the production.

[0057] The following is an example of producing 4J29 strip and TC4 plate at the same time. The thickness of 4J29 strip product is 4mm, and the thickness of TC4 plate product is 15mm. The production steps are as follows:

[0058] 1. The 4J29 billet with a specification of 150×500×2500mm heated to 1200℃ in the billet heating furnace 1 is transported to the rolling mill body 2 through the transport roller 10 and rolled to a specification of 45×520×8000mm. Then, it enters the online supplementary heating furnace 8. The online supplementary heating furnace 8 is initially set above the transport roller 10 and moves horizontally to the outside of the line to supplement the heating of the 4J29 billet. The supplementary heating time is 90 minutes.

[0059] 2. While the 4J29 billet is being supplemented with heat, the TC4 billet with a specification of 200×820×2500mm, which is heated to 920°C in the billet heating furnace 1, is transported to the rolling mill body 2 through the transport roller 10 and rolled to a specification of 60×845×8000mm. It then enters the roller heating furnace 3 for supplementary heating. The supplementary heating time in the furnace is 45 minutes.

[0060] 3. While the TC4 billet is undergoing the reheating process, the 4J29 billet that has completed the 90-minute reheating process in the online reheating furnace 8 is taken out of the furnace for multi-pass reversible rolling of the rolling mill body 2. After being rolled to a specification of 4×525×89000mm, it is conveyed to the rapid cooling system 7 through the transport roller 10. The rapid cooling system 7 sprays cooling water to perform high-temperature solution heat treatment and cooling on the 4J29 billet. After being straightened by the leveling machine 11, the shearing machine 12 is used to cut off the head and tail of the 4J29 billet by 300mm each. Finally, the strip is coiled and unloaded on the coiler 9, and finally stored on the storage rack.

[0061] 4. Within a certain time interval after the production of 4J29 strip is completed, the TC4 billet that has completed the 45-minute reheating process in the roller heating furnace 3 is taken out of the furnace for multi-pass reversible rolling of the rolling mill body 2. After being rolled to a specification of 15×850×32000mm, it is transferred to the rapid cooling system 7 through the transport roller 10. The rapid cooling system 7 sprays cooling air to rapidly cool the billet until the billet drops to room temperature.

[0062] 5. The TC4 billet after rapid cooling by cooling air is conveyed to the leveler 4 through the conveying roller 10 for flattening, and then cut into 16 pieces of plates with a length of 2000mm, a thickness of 15mm and a width of 850mm by the shearing machine 5. Finally, the TC4 plates are unloaded, transported and stacked by the unloading device 6 to complete the production.

[0063] The following is an example of the simultaneous production of copper alloy C19210 plates, titanium alloy TC4 plates and functional material 4J29 strips. The thickness of the copper alloy C192100 plates is 70mm, the thickness of the titanium alloy TC4 plates is 15mm, and the thickness of the functional material 4J29 strip is 4mm. The production steps are as follows:

[0064] 1. After being heated to 1200℃ in the billet heating furnace 1 and with specifications of 150×500×2500mm, the 4J29 billet is transported to the rolling mill body 2 through the transport roller 10 and rolled to specifications of 45×520×8000mm. It then enters the online supplementary heating furnace 8 for supplementary heating. The online supplementary heating furnace 8 is initially set above the transport roller 10 and moves horizontally to the outside of the line. The supplementary heating time in the furnace is 90min.

[0065] 2. While the 4J29 billet is undergoing the reheating process, the C19210 copper alloy billet with a specification of 230×620×4000mm, which is heated to 980°C in the billet heating furnace 1, is transported to the rolling mill body 2 through the transport roller 10 and rolled to a specification of 70×635×12830mm. Due to the large thickness of the product, there are only three rolling passes and the production time is within 0.5~2min. There is no need to stay still in the furnace for reheating in the intermediate process. It only needs to be adjusted within 0.2~1min during the process of the transport roller 10 passing through the roller heating furnace 3 to meet the process temperature.

[0066] 3. After the C19210 billet is rolled, the 4J29 billet on the production line is still in the process of reheating. The required 90-minute reheating time is much longer than the maximum rolling time of C192100 (2+1=3 minutes). Moreover, it is located in the online reheating furnace 8 outside the production line, which does not affect the transportation, rolling and other production processes of the C19210 billet on the production line. At this time, the C19210 billet is transported to the quick cooling system 7 on the rear side of the machine through the transport roller 10. The quick cooling system 7 sprays cooling water to perform high-temperature solution heat treatment on the billet, and the temperature is lower than 280°C.

[0067] 4. After the high-temperature solution heat treatment in cooling water, the C19210 blank is conveyed to the flat press device 4 on the front side of the machine through the conveying roller 10 for flattening, and then cut into three plates with a length of 4000, a thickness of 70mm, and a width of 635mm by the shearing machine 5. Finally, the C19210 plates are unloaded, transported, and stacked by the plate unloading device 6.

[0068] 5. During the process of C19210 slab being flattened by flat press device 4 and sheared by shearing machine 5, since there is no material occupied between the billet heating furnace 1 and the rolling mill body 2, the 4J29 billet is still in the process of supplementary heating. The third type of TC4 billet to be rolled is ready to enter the production line for processing.

[0069] 6. While the 4J29 billet is being supplemented with heat, the TC4 billet with a specification of 200×820×2500mm, which is heated to 920°C in the billet heating furnace 1, is transported to the rolling mill body 2 through the transport roller 10 and rolled to a specification of 60×845×8000mm. It then enters the fixed roller heating furnace 3 for supplementary heating. The supplementary heating time in the furnace is 45 minutes.

[0070] 7. While the TC4 billet is undergoing the reheating process, the 4J29 billet that has completed the 90-minute reheating process in the online reheating furnace 8 is taken out of the furnace for multi-pass reversible rolling of the rolling mill body 2. After rolling to a specification of 4×525×89000mm, it is transported to the rapid cooling system 7 on the rear side of the machine through the transport roller 10. The rapid cooling system 7 sprays cooling water for high-temperature solution heat treatment and cooling. Then, after straightening by the 17-roller leveling machine 4, the shearing machine 5 is used to cut off 300mm of the head and tail of the 4J29 strip. Finally, the strip is coiled and unloaded on the coiler 9 and stored on the storage rack.

[0071] 8. Within a certain time interval after the production of 4J29 strip is completed, the TC4 billet that has completed the 45-minute reheating process in the roller heating furnace 3 is taken out of the furnace for multi-pass reversible rolling of the rolling mill body 2. After being rolled to a specification of 15×850×32000mm, it is transported to the rapid cooling system 7 on the rear side of the machine through the transport roller 10. The rapid cooling system 7 sprays cooling air to quickly cool the billet to room temperature.

[0072] 9. The TC4 blanks that have been rapidly cooled by cooling air are conveyed to the flat plate press device 4 on the front side of the machine through the conveying roller 10 for flattening, and then cut into 16 pieces of plates with a length of 2000, a thickness of 15mm, and a width of 850mm by the shearing machine 5. Finally, the TC4 plates are unloaded, transported, and stacked by the plate unloading device 6 to complete the production.

[0073] The above examples are only individual examples. In addition to the functions of traditional production lines to produce rare and refractory metals of one plate or one strip, the rolling mill production line of the rare and refractory metal plates and strips of the present invention can also simultaneously produce and online heat, roll, supplement heat, cool, finish and shear 2 to 3 kinds of rare and refractory metals of 2 plates, 1 plate and one strip, and 2 plates and one strip. In this embodiment, only four rare and refractory metals, namely copper alloy C19210, titanium alloy TC4, functional material 4J29 and tungsten (W), are listed, and the production of other rare and refractory metal varieties will not be given one by one.

[0074] It can be seen that the rolling mill production line of the present invention can simultaneously produce metal plates and strips of different alloy types on one production line. Compared with traditional rolling mill production lines, it can effectively improve the production utilization rate of equipment, increase production capacity, reduce costs, reduce auxiliary production time, reduce energy consumption, and improve enterprise benefits.

[0075] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A method for producing rare and refractory metal sheets and strips, characterized in that: The following steps are performed in a rolling mill line for rare and refractory metal strip: Step 1: transporting rare and refractory metal billets to a billet heating furnace (1) via a transport roller (10) for heating; Step 2: transporting the heated rare and refractory metal billets to the rolling mill body (2) via a transport roller (10) for rolling; Step 3: conveying the rolled plate through a conveying roller (10) to a roller heating furnace (3) for supplementary heating, and conveying the rolled strip through a conveying roller (10) to an online supplementary heating furnace (8) for supplementary heating; Step 4: transporting the plates and strips after supplementary heating to the rapid cooling system (7) through a transport roller (10) for high-temperature solution heat treatment and cooling; Step 5: conveying the plate after high-temperature solid solution heat treatment and cooling to the first leveler (4) through the conveying roller (10) for flattening, and conveying the strip after high-temperature solid solution heat treatment and cooling to the second leveler (11) through the conveying roller (10) for straightening; Step 6: conveying the flattened plate to shearing machine 1 (5) through a conveying roller (10) for shearing to a predetermined size, and conveying the straightened strip to shearing machine 2 (12) through a conveying roller (10) for cutting off the head and tail of the strip; Step 7: The sheared plates are transported to the unloading device (6) via a transport roller (10) for unloading, transportation and stacking; the strip with the head and tail cut off is transported to the coiler (9) via a transport roller (10) for coiling and unloading; The rolling mill production line for rare and refractory metal plates and strips comprises a transport roller (10) for transporting rare and refractory metal plates and strips and a rolling mill body (2) arranged in the middle of the transport roller (10), wherein the transport roller (10) is provided with a feeding device (6), a shearing machine (5), a leveling machine (4), a roller heating furnace (3), a billet heating furnace (1), a quick cooling system (7), an online supplementary heating furnace (8), a leveling machine (11), a shearing machine (12), and a rolling mill body (2) in sequence along its length direction. 2), a coiler (9), wherein the rolling mill body (2) is located between the billet heating furnace (1) and the rapid cooling system (7), and the rare and refractory metal plates and strips can be transported to any device among the unloading device (6), shearing machine 1 (5), leveling machine 1 (4), roller heating furnace (3), billet heating furnace (1), rolling mill body (2), rapid cooling system (7), online supplementary heating furnace (8), leveling machine 2 (11), shearing machine 2 (12), and coiler (9) through a transport roller (10).

2. A method for producing rare and refractory metal sheets and strips according to claim 1, characterized in that: The strip that has been supplementally heated in step 3 is first transported to the rolling mill body (2) for multiple passes of reversible rolling before entering the rapid cooling system (7) for cooling.

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