Tension block type cold rolling process for tin-iron-chromium component zirconium alloy sheet with thickness of 0.05-0.8 mm

Abstract

The invention discloses a tension block type cold rolling process for a tin-iron-chromium component zirconium alloy sheet with the thickness of 0.05-0.8 mm. A cross-shaped cold roll system structure with an upper structure, a lower structure, a left structure and a right structure is adopted, namely, a cold rolling structure with two main upper and lower rolls and two auxiliary front and rear rolls is adopted in a single-rack housing body of the same cold rolling mill housing. Five rolling contact lines can be formed between every two partial guide rollers arranged in the horizontal direction and every two main rollers arranged in the vertical direction, and the three contact lines can participate in rolling deformation of the HZr702 thin plate in the rolling process. Compared with a single deformation rolling production mode of double rollers and a single contact line which are commonly used in the current industry and are of an up-down vertical symmetrical arrangement structure, a single-piece'block-type method 'tension-free rolling production process in the traditional technology is realized into a'block-type method' belt tension rolling production process, and the plate type quality of a zirconium alloy HZr702 thin plate produced in the prior art can be improved to be below 30I; and the comprehensive yield and the product quality of the product are effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of zirconium alloy sheet production, and specifically to a cold rolling process by the tension block method for tin-iron-chromium component zirconium alloy thin sheets with a thickness of 0.05 - 0.8 mm. Background Art

[0002] Zirconium and zirconium alloy sheets have high hardness, good ductility and corrosion resistance, and are thus widely used in high-tech fields represented by the manufacture of nuclear power neutron absorption plates. In recent years, the zirconium alloy HZr702 added with micro-alloying elements such as tin, iron, and zirconium has developed rapidly due to its excellent high-temperature creep resistance and corrosion resistance, and has been widely used in the fields of aviation, aerospace, chemical engineering, metallurgy, etc.

[0003] The tin-iron-chromium component zirconium alloy HZr702 thin sheets with a thickness of 0.05 - 0.8 mm are mainly used for the manufacture of high-temperature components such as the combustion chamber, nozzle, and exhaust system of aeroengines. In the nuclear industry, the HZr702 thin sheets, as the fuel cladding material of nuclear reactors, can resist the erosion of nuclear radiation and high-temperature and high-pressure environments. In the biomedical field, the HZr702 thin sheets are used to manufacture bone and dental medical devices due to their excellent biocompatibility. Therefore, the zirconium alloy HZr702 thin sheets with a thickness of 0.05 - 0.8 mm have become a hot spot in the production and application of the non-ferrous metal industry, but their difficult-to-deform metal characteristics also make their production more difficult.

[0004] At present, when the industry produces thin sheets of tin-iron-chromium component zirconium alloy HZr702 with a thickness of 0.05 - 0.8 mm, a two-high or four-high cold rolling mill with an up-and-down vertically symmetric roll system structure is used for block production. It can only form a rolling pressure in the vertical direction and a single reduction deformation in the vertical direction on the thin sheets of tin-iron-chromium component zirconium alloy HZr702 with a thickness of 0.05 - 0.8 mm. There is a lack of tension during the production of the thin sheets in the front and back directions, and it is impossible to form a clamping force on the head and tail of the thin sheets. The head and tail of the rolled sheet are continuously in a free state during the production process, and the thin zirconium alloy HZr702 sheets with a relatively thin thickness are prone to production defects such as stacking, winding, and warping. If a pair of rolls device is set in front of and behind the main frame where the cold rolling roll structure is located to press the thin sheets of zirconium alloy HZr702 to generate a front and back clamping force, due to the limitations of the rolling mill housing structure and size, the distance between this pair of rolls device and the roll gap of the main frame is at least 1.5 m - 2.0 m or more on one side. This requires ensuring that the length of the cold-rolled HZr702 thin sheet is at least 2×(1.5 - 2.0) m = 3.0 m - 4.0 m or more. However, once the length of the ultra-thin HZr702 thin sheet with a thickness of 0.05 - 0.8 mm exceeds 1.5 m, it is in an overall unstable structure, and the sheet itself cannot be transported normally, let alone clamped and cold-rolled normally. Therefore, it is impossible to carry out normal production on the thin sheets of tin-iron-chromium component zirconium alloy HZr702 with a thickness of 0.05 - 0.8 mm by using a pair of rolls in front of and behind the main frame with a "multi-stand" cold rolling structure similar to that outside the main frame.

[0005] At the same time, the production efficiency of HZr702 thin sheets during the above-mentioned conventional single-pass single-reduction symmetric block cold rolling method is relatively low. The rolled sheet products under single-direction and symmetric deformation have serious anisotropy, and the comprehensive finished product rate is less than 30%, resulting in too high a selling price and being not conducive to low-cost promotion and application in the industry. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to overcome the existing defects and provide a tension block cold rolling process for thin sheets of tin-iron-chromium component zirconium alloy with a thickness of 0.05 - 0.8 mm, realizing the single-piece "block method" non-tension rolling production process in the traditional technology into a "block method" tension rolling production process. The sheet shape quality of the zirconium alloy HZr702 thin sheets with a thickness of 0.05 - 0.8 mm produced by the existing technology can be improved from the current 50I - 100I to below 30I, effectively improving the comprehensive finished product rate and product quality of the product, and effectively solving the problems in the background technology.

[0007] To achieve the above object, the present invention provides the following technical solution: A tension block cold rolling process for thin sheets of tin-iron-chromium component zirconium alloy with a thickness of 0.05 - 0.8 mm, comprising the following steps: S1) Set up four-roll driven cold rolling: On the same single-stand housing body, set up the upper vertical work roll and the lower vertical work roll of the cold rolling mill. On both sides of the upper vertical work roll and the lower vertical work roll of the cold rolling mill, set up the front floating deflecting horizontal roll and the rear floating deflecting horizontal roll respectively, forming a four-roll driven cold rolling structure of "two main upper and lower rolls + two auxiliary front and rear deflecting rolls". S2) Form rolling contact lines: The upper vertical work roll, the lower vertical work roll, the front floating deflecting horizontal roll and the rear floating deflecting horizontal roll of the cold rolling mill form a total of five rolling contact lines with the upper and lower vertical rolling line elevations of ±H and the horizontal deflecting rolling line elevations of ±h in a parallel state. During the cold rolling process, two rolling line elevations and three of the rolling contact lines jointly participate in the cold rolling of the zirconium alloy plate. S3) First-pass cold rolling: The zirconium alloy plate is clamped by the front floating deflecting horizontal roll and the front thin sheet transport roller table and enters the rolling pressure between the front floating deflecting horizontal roll and the lower vertical work roll of the cold rolling mill for the first reduction, then enters the rolling pressure between the upper vertical work roll and the lower vertical work roll of the cold rolling mill for the second reduction, and finally enters the rolling pressure between the upper vertical work roll and the rear floating deflecting horizontal roll of the cold rolling mill for the third reduction. S4) Second-pass cold rolling: The zirconium alloy plate is clamped by the rear floating deflecting horizontal roll and the rear thin sheet transport roller table and enters the rolling pressure between the rear floating deflecting horizontal roll and the lower vertical work roll of the cold rolling mill for the first reduction, then enters the rolling pressure between the upper vertical work roll and the lower vertical work roll of the cold rolling mill for the second reduction, and finally enters the rolling pressure between the upper vertical work roll and the front floating deflecting horizontal roll of the cold rolling mill for the third reduction. S5) Multiple cold rollings: Repeat the steps S3) and S4) to perform multiple cold rollings on the zirconium alloy plate until the thickness reaches the production requirements.

[0008] As a preferred technical solution of the present invention, the absolute value of the difference between the vertical rolling line elevation ±H and the horizontal deflecting rolling line elevation ±h is greater than half of the radius R / 2 of the upper vertical work roll and the lower vertical work roll of the cold rolling mill, and at the same time less than the radius r of the front floating deflecting horizontal roll and the rear floating deflecting horizontal roll.

[0009] As a preferred technical solution of the present invention, the internal front tension of the zirconium alloy plate in the steps S3) and S4) is established by the horizontal reduction extrusion pressure between the front floating deflecting horizontal roll and the lower vertical work roll of the cold rolling mill and the vertical extrusion pressure between the upper vertical work roll and the lower vertical work roll of the cold rolling mill, and the rear tension is established by the horizontal reduction extrusion pressure between the rear floating deflecting horizontal roll and the lower vertical work roll of the cold rolling mill and the vertical extrusion pressure between the upper vertical work roll and the lower vertical work roll of the cold rolling mill.

[0010] As a preferred technical solution of the present invention, the absolute value of the rolling speed difference between the deflecting horizontal roll and the main roll on the outlet side of the zirconium alloy plate is less than the absolute value of the rolling speed difference between the deflecting horizontal roll and the main roll on the inlet side.

[0011] As a preferred technical solution of the present invention, in the step S3), the rolling speed relationship during the first reduction is: V1 逆（机前浮动偏导水平轧辊） >V1 顺（冷轧机下垂直工作辊） , and the rolling speed relationship during the second reduction is: V2 逆（冷轧机上垂直工作辊） >V2 顺（冷轧机下垂直工作辊） =V1 顺（冷轧机下垂直工作辊） , and the rolling speed relationship during the third reduction is: V3 逆（冷轧机上垂直工作辊） =V2 逆（冷轧机上垂直工作辊） <V3 顺（机后浮动偏导水平轧辊） .

[0012] As a preferred technical solution of the present invention, in the step S3), the first reduction rate, the second reduction rate, and the third reduction rate are respectively controlled at 10% and below, 75% and above, and 15% and below of the total reduction rate of the odd-numbered passes.

[0013] As a preferred technical solution of the present invention, in the step S3), the front tension value P formed between the second and third reductions of the zirconium alloy plate 23 = 4 - 8 kN, and the back tension value P formed between the first and second reductions 12 = (1.2 - 1.5)P 23 kN.

[0014] As a preferred technical solution of the present invention, in the step S4), the rolling speed relationship during the first reduction is: V1 顺（机后浮动偏导水平轧辊） >V1 逆（冷轧机下垂直工作辊） , and the rolling speed relationship during the second reduction is: V2 顺（冷轧机上垂直工作辊） >V2 逆（冷轧机下垂直工作辊） =V1 逆（冷轧机下垂直工作辊） , and the rolling speed relationship during the third reduction is: V3 顺（冷轧机上垂直工作辊） =V2 顺（冷轧机上垂直工作辊） <V3 逆（机前浮动偏导水平轧辊） .

[0015] As a preferred technical solution of the present invention, in the step S4), the first reduction rate, the second reduction rate, and the third reduction rate are respectively controlled at 15% and below, 60% and above, and 25% and below of the total reduction rate of the even-numbered passes.

[0016] As a preferred technical solution of the present invention, in the step S4), the front tension value P formed between the second and third reductions of the zirconium alloy plate 23= 6 to 12 kN, the post-tension value P formed between the first and second rolling reductions 12 = (1.5 to 2.0)P 23 kN.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: A "cross-shaped" cold rolling roll system structure with upper, lower, left, and right structures is adopted, that is, a cold rolling structure of "two main upper and lower rolls + two auxiliary front and rear rolls" is adopted within the single stand housing of the same cold rolling mill housing. Five rolling contact lines can be formed in total between the two partial guide rolls arranged horizontally and the two main rolls arranged vertically respectively. During the rolling process, three contact lines can participate in the rolling deformation of the HZr702 thin sheet. Compared with the single deformation rolling production mode of a single contact line of the double rolls with the upper and lower vertically symmetric arrangement structure commonly used in the current industry, the cold rolling process of the zirconium alloy HZr702 thin sheet can be effectively improved and stabilized.

[0018] At the same time, the front guide horizontal roll and the rear guide horizontal roll of the machine respectively achieve close-range tension control of the zirconium alloy HZr702 thin sheet through extrusion contact and rolling reduction with the main rolls of the upper and lower vertical arrangement structure. The rolling reduction rate per pass and the generation of rolling pressure are respectively generated by the main roll system of the upper and lower arrangement structure through horizontal movement in a floating state of the front and rear guide horizontal rolls of the machine after the main rolling reduction is fixed.

[0019] During the rolling production of the zirconium alloy HZr702 thin sheet, tensions are formed between the front and rear guide horizontal rolls of the machine and the upper and lower main rolls of the rolling mill respectively, realizing the non-tension rolling production process of the traditional single-piece "block method" into a "block method" tension rolling production process. The flatness quality of the zirconium alloy HZr702 thin sheet with a thickness of 0.05 to 0.8 mm produced by the prior art can be improved from the current 50I to 100I to below 30I, effectively improving the overall yield and product quality of the product.

[0020] During the production process, while the cold rolling structure performs tension rolling on the HZr702 thin sheet, the double rolling line mode can achieve three rolling reductions for the zirconium alloy HZr702 thin sheet with a thickness of 0.05 to 0.8 mm in one cold rolling pass, increasing the cold rolling production efficiency by more than 30%, reaching the production effect of a three-stand tandem cold rolling mill. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is the process flow chart of the present invention; Figure 2 is the schematic diagram of the cold rolling structure of the present invention.

[0022] In the figure: 1 zirconium alloy plate, 2 upper vertical working roll of cold rolling mill, 3 lower vertical working roll of cold rolling mill, 4 front floating deflection horizontal roll of the mill, 5 rear floating deflection horizontal roll of the mill, 6 front conveying roller table of the mill, 7 rear conveying roller table of the mill, 8 single-stand housing body. Specific embodiments

[0023] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0024] Please refer to Figure 1-2 , the present invention provides a technical solution: a cold rolling process for tin-iron-chromium component zirconium alloy thin sheet with a thickness of 0.05 - 0.8 mm by the tension block method, including the following steps: S1) Set four-roll drive cold rolling: Set the upper vertical working roll 2 and the lower vertical working roll 3 of the cold rolling mill on the same single-stand housing body 8. On both sides of the upper vertical working roll 2 and the lower vertical working roll 3 of the cold rolling mill, there are respectively arranged a front floating deflection horizontal roll 4 and a rear floating deflection horizontal roll 5 of the mill, forming a "cross-shaped" four-roll drive cold rolling structure with an upper, lower, left, and right structure of "two main upper and lower rolls + two auxiliary front and rear deflection rolls". On both sides of the single-stand housing body 8, there are also respectively arranged a front conveying roller table 6 and a rear conveying roller table 7 of the mill.

[0025] The lower vertical working roll 3 of the cold rolling mill is integrally fixed and cannot move in the up and down directions and the front and rear directions. The bearing seat of the lower vertical working roll 3 of the cold rolling mill is fixed and can only rotate forward or backward during the rolling process.

[0026] The upper vertical working roll 2 of the cold rolling mill is fixed in the front and rear directions as a whole, and only moves in the up and down directions for rolling reduction and rotates forward or backward during the rolling process. Specifically, existing commonly used driving devices such as hydraulic cylinders can be used to directly push the roll bearing seat to move, or electric screw-down devices such as worm and gear mechanisms: the motor drives the screw-down screw through a worm reduction device to precisely adjust the vertical position of the roll, and a digital display system can be equipped to provide real-time feedback on the adjustment amount.

[0027] The front floating deflecting horizontal roll 4 and the rear floating deflecting horizontal roll 5 are not fixed in the up-down direction and the front-rear direction, and can move in the up-down direction for rolling reduction, move in the front-rear direction for horizontal rolling reduction, and rotate forward or backward during the rolling process. Specifically, commonly used driving equipment in the prior art such as hydraulic cylinders can be used to directly push the roll bearing housing up and down. For the front-rear movement, a worm gear + lead screw mechanism can be adopted, and the worm is rotated by a manual wheel or an electric wheel to drive the lead screw to horizontally move the roll bearing housing back and forth.

[0028] S2) Forming a rolling contact line: The vertical work roll 2 on the cold rolling mill, the vertical work roll 3 under the cold rolling mill, the front floating deflecting horizontal roll 4 and the rear floating deflecting horizontal roll 5 together form the vertical rolling line elevation ±H and the horizontal deflecting rolling line elevation ±h in a parallel state and five rolling contact lines between each other. During the cold rolling process of zirconium alloy plate 1, two rolling line elevations and three of the rolling contact lines jointly participate in the cold rolling of the zirconium alloy plate 1. Compared with the single-deformation rolling production mode of a single contact line with an up-down vertically symmetric arrangement structure in the current industry, the cold rolling process of zirconium alloy HZr702 thin sheets can be effectively improved and stabilized.

[0029] The front deflecting horizontal roll and the rear deflecting horizontal roll respectively achieve close-range tension control of the zirconium alloy HZr702 thin sheets through extrusion contact and reduction with the main rolls with an up-down vertical arrangement structure. The pass reduction rate and the generation of rolling pressure are respectively generated by the main roll train with an up-down arrangement structure after the main rolling reduction and fixation, and then the front and rear deflecting horizontal rolls are horizontally moved in a floating state.

[0030] During the rolling production of zirconium alloy HZr702 thin sheets, tensions are respectively formed between the front and rear deflecting horizontal rolls and the upper and lower main rolls of the rolling mill, realizing the "block method" tension rolling production process from the single-piece "block method" non-tension rolling production process in the traditional technology. The plate shape quality of the zirconium alloy HZr702 thin sheets with a thickness of 0.05 - 0.8 mm produced by the existing technology can be improved from the current 50I - 100I to below 30I, effectively improving the comprehensive yield and product quality of the product.

[0031] S3) The first pass cold rolling: The zirconium alloy plate 1 is clamped between the front floating deflecting horizontal roll 4 and the front thin sheet conveying roller table 6 and enters the rolling pressure between the front floating deflecting horizontal roll 4 and the vertical work roll 3 under the cold rolling mill for the first reduction, then enters the rolling pressure between the vertical work roll 2 on the cold rolling mill and the vertical work roll 3 under the cold rolling mill for the second reduction, and finally enters the rolling pressure between the vertical work roll 3 on the cold rolling mill and the rear floating deflecting horizontal roll 5 for the third reduction.

[0032] The reduction ratio of the first pass, the reduction ratio of the second pass, and the reduction ratio of the third pass are respectively controlled to be 10% and below, 75% and above, and 15% and below of the total reduction ratio of odd-numbered passes (the first, third, fifth, etc. passes).

[0033] S4) Cold rolling in the second pass: The zirconium alloy plate 1 is clamped by the floating deflection horizontal roll 5 behind the machine and the thin sheet transporting roller table 7 behind the machine, and undergoes the first reduction under the rolling pressure between the floating deflection horizontal roll 5 behind the machine and the lower vertical working roll 3 of the cold rolling mill, then undergoes the second reduction under the rolling pressure between the upper vertical working roll 2 and the lower vertical working roll 3 of the cold rolling mill, and finally undergoes the third reduction under the rolling pressure between the upper vertical working roll 3 of the cold rolling mill and the floating deflection horizontal roll 4 in front of the machine.

[0034] The reduction ratio of the first pass, the reduction ratio of the second pass, and the reduction ratio of the third pass are respectively controlled to be 15% and below, 60% and above, and 25% and below of the total reduction ratio of even-numbered passes (the second, fourth, sixth, etc. passes).

[0035] The block method process of the existing cold rolling mechanism can only achieve a single rolling deformation in a single stand and single rolling pass with the upper and lower vertical main rolls pressing down for HZr702 thin sheets, so the production efficiency is relatively low. If multiple reduction deformations can be achieved in a single stand and single rolling pass, the effect of multi-stand cold rolling can be produced, effectively improving the production efficiency and reducing energy consumption.

[0036] This technical solution can innovate the single rolling line mode in the existing single stand cold rolling structure mode into a double rolling line mode. Among them, the vertical rolling line (elevation ±H) of the main rolls arranged symmetrically up and down vertically and the horizontal deflection rolling line (elevation ±h) formed between the deflection horizontal rolls in front of and behind the machine and the transporting roller table are parallel to each other. In addition, the absolute value of the difference between the elevation ±H of the vertical rolling line and the elevation ±h of the horizontal deflection rolling line is greater than half of the radius of the upper and lower vertical working rolls of the cold rolling mill, that is, R / 2, and at the same time less than the radius r of the deflection horizontal rolls in front of and behind the machine. The absolute value of the elevation ±h of the horizontal deflection rolling line needs to be 0.5 - 3 mm higher than the elevation of the HZr702 thin sheet on the transporting roller tables in front of and behind the machine. During the production process, while the cold rolling structure performs tension rolling on the HZr702 thin sheet, the double rolling line mode can achieve three reduction deformations for the zirconium alloy HZr702 thin sheet with a thickness of 0.05 - 0.8 mm in a single cold rolling pass, and can increase the cold rolling production efficiency by more than 30%, achieving the production effect of a three-stand tandem cold rolling mill.

[0037] The upper vertical working roll 2 and the lower vertical working roll 3 of the cold rolling mill are symmetrically arranged up and down on the horizontal plane where the elevation of the vertical rolling line of ±H is located. The floating deflection horizontal roll 4 in front of the machine and the floating deflection horizontal roll 5 behind the machine are symmetrically arranged before and after on the vertical plane where the elevation of the vertical rolling line of ±H is located.

[0038] S5) Multi-pass cold rolling: Repeat the steps S3) and S4) to perform multi-pass cold rolling on the zirconium alloy plate 1 until the thickness reaches the production requirement.

[0039] In this application, the traditional single-stand non-tension block method process realizes tension rolling without changing the main structure of the stand, improving the plate shape quality, production efficiency and rolling stability of zirconium alloy HZr702 thin sheets with a thickness of 0.05 - 0.8 mm. At the same time, the single rolling pass with only 1 reduction deformation in the traditional technology is increased to 3 reduction deformations in a single rolling pass, which can increase the production efficiency by more than 30%, reduce the production cost of zirconium alloy HZr702 thin sheets with a thickness of 0.05 - 0.8 mm, and is conducive to the low-cost application of products. In addition, by using the asymmetric deformation of the deflector horizontal roll and the vertical roll during the 3 reduction deformations in a single rolling pass, the anisotropy during the rolling deformation of zirconium alloy HZr702 thin sheets with a thickness of 0.05 - 0.8 mm is reduced, and the consistency and uniformity of product performance are improved.

[0040] In a preferred technical solution, the internal front tension of the zirconium alloy plate 1 in steps S3) and S4) is established by the horizontal reduction extrusion force between the floating deflector horizontal roll 4 in front of the mill and the lower vertical work roll 3 of the cold rolling mill, and the vertical extrusion force between the upper vertical work roll 2 of the cold rolling mill and the lower vertical work roll 3 of the cold rolling mill. The rear tension is established by the horizontal reduction extrusion force between the floating deflector horizontal roll 5 behind the mill and the lower vertical work roll 3 of the cold rolling mill, and the vertical extrusion force between the upper vertical work roll 2 of the cold rolling mill and the lower vertical work roll 3 of the cold rolling mill.

[0041] In a preferred technical solution, to achieve the effect that the rear tension of the HZr702 thin sheet is greater than the front tension, which is beneficial to improving the plate shape quality, the absolute value of the rolling speed difference between the deflector horizontal roll and the main roll on the outlet side of the zirconium alloy plate 1 is less than the absolute value of the rolling speed difference between the deflector horizontal roll and the main roll on the inlet side.

[0042] In a preferred technical solution, to achieve the introduction, reduction and asymmetric rolling between the upper work roll, lower work roll, front horizontal roll and rear horizontal roll of the cold rolling mill for the alloy HZr702 thin sheet, the relevant speed matching relationships for the 1st, 3rd, 5th and other odd-numbered passes of cold rolling during the 1st, 2nd and 3rd reductions are as follows: The rolling speed relationship during the first reduction is: V1 逆（机前浮动偏导水平轧辊4） >V1 顺（冷轧机下垂直工作辊3） For the second reduction, the rolling speed relationship is: V2 逆（冷轧机上垂直工作辊2） >V2 顺（冷轧机下垂直工作辊3） =V1 顺（冷轧机下垂直工作辊3） For the third reduction, the rolling speed relationship is: V3 逆（冷轧机上垂直工作辊2） =V2 逆（冷轧机上垂直工作辊2） <V3 顺（机后浮动偏导水平轧辊5） . The front tension value P formed between the second and third reductions of the zirconium alloy plate 123 = 4 to 8 kN, the back tension value P formed between the first and second reductions 12 = (1.2 to 1.5)P 23 kN.

[0043] For the preferred technical solution, to achieve the introduction, reduction, and asymmetric rolling between the work roll above, the lower work roll of the cold rolling mill, the horizontal roll in front of the mill, and the horizontal roll behind the mill of the alloy HZr702 thin sheet on the above cold rolling mill, the rolling speed relationship during the first reduction is: V1 顺（机后浮动偏导水平轧辊5） > V1 逆（冷轧机下垂直工作辊3） During the second reduction, the rolling speed relationship is: V2 顺（冷轧机上垂直工作辊2） > V2 逆（冷轧机下垂直工作辊3） = V1 逆（冷轧机下垂直工作辊3） During the third reduction, the rolling speed relationship is: V3 顺（冷轧机上垂直工作辊2） = V2 顺（冷轧机上垂直工作辊2） < V3 逆（机前浮动偏导水平轧辊4） . The front tension value P formed between the second and third reductions of the zirconium alloy plate 1 23 = 6 to 12 kN, the back tension value P formed between the first and second reductions 12 = (1.5 to 2.0)P 23 kN.

[0044] After adopting the above cold rolling process mode, the anisotropy degree of the yield strength, tensile strength, high-temperature creep resistance, elongation, etc. of the zirconium alloy HZr702 thin sheet with a thickness of 0.05 to 0.8 mm produced by the traditional symmetric rolling with an up-and-down vertical layout structure in the 0°, 45°, 90°, and 180° directions of the sheet can be reduced from > 30% to below 10%, effectively meeting the production process requirements for the performance consistency and uniformity of the zirconium alloy thin sheet.

[0045] The parts not disclosed in the present invention are all prior arts, and their specific structures, materials, and working principles will not be elaborated. Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirits of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A tension block cold rolling process for a 0.05-0.8 mm thick tin-iron-chromium zirconium alloy sheet, characterized in that: The following steps are involved: S1) Setting up four-roller drive cold rolling: setting up the upper vertical working roll of the cold rolling mill and the lower vertical working roll of the cold rolling mill on the same single-frame arch body, and setting up the front floating partial guide horizontal roll and the rear floating partial guide horizontal roll on both sides of the upper vertical working roll and the lower vertical working roll of the cold rolling mill, respectively, to form a four-roller drive cold rolling structure of "two main upper and lower rolls + two auxiliary front and rear partial guide rolls"; S2) forming a rolling contact line: the upper vertical working roll of the cold rolling mill, the lower vertical working roll of the cold rolling mill, the front floating guide horizontal roll and the rear floating guide horizontal roll form a parallel upper and lower vertical rolling line elevation ±H and a horizontal guide rolling line elevation ±h and five rolling contact lines. In the cold rolling process, the two rolling line elevations and three rolling contact lines participate in the cold rolling of the zirconium alloy plate; S3) First cold rolling: The zirconium alloy plate is clamped by the front floating guide horizontal roller and the front thin plate transport roller, and then enters the rolling pressure between the front floating guide horizontal roller and the lower vertical working roller of the cold rolling mill for one pressing, and then enters the rolling pressure between the upper vertical working roller of the cold rolling mill and the lower vertical working roller of the cold rolling mill for two pressing, and finally enters the rolling pressure between the upper vertical working roller of the cold rolling mill and the rear floating guide horizontal roller for three pressing; S4) Second cold rolling: The zirconium alloy plate is clamped by the floating guide horizontal roller behind the machine and the thin plate transport roller behind the machine, and then enters the rolling pressure between the floating guide horizontal roller behind the machine and the vertical working roller below the cold rolling mill for one pressing, and then enters the rolling pressure between the vertical working roller on the cold rolling mill and the vertical working roller below the cold rolling mill for two pressing, and finally enters the rolling pressure between the vertical working roller on the cold rolling mill and the floating guide horizontal roller in front of the machine for three pressing; S5) Multiple cold rolling: Repeat the steps S3) and S4) to perform multiple cold rolling on the zirconium alloy plate until the thickness reaches the production requirement.

2. A tension block cold rolling process for a 0.05-0.8 mm thick tin-iron-chromium zirconium alloy sheet according to claim 1, characterized in that: The absolute value of the difference between the vertical rolling line elevation ±H and the horizontal guide rolling line elevation ±h is greater than half of the radius of the upper vertical working roll and the lower vertical working roll of the cold rolling mill, i.e., R / 2, and is smaller than the radius r of the floating guide horizontal roll in front of the machine and the floating guide horizontal roll behind the machine.

3. A tension block cold rolling process for a tin-iron-chromium zirconium alloy sheet with a thickness of 0.05-0.8 mm according to claim 1, characterized in that: In the step S3) and the step S4), the internal front tension of the zirconium alloy plate 1 is established by the horizontal pressing and extrusion pressure between the front floating deflection guide horizontal roller and the lower vertical working roller of the cold rolling mill, and the vertical extrusion pressure between the upper vertical working roller of the cold rolling mill and the lower vertical working roller of the cold rolling mill, and the rear tension is established by the horizontal pressing and extrusion pressure between the rear floating deflection guide horizontal roller and the lower vertical working roller of the cold rolling mill, and the vertical extrusion pressure between the upper vertical working roller of the cold rolling mill and the lower vertical working roller of the cold rolling mill.

4. The cold rolling process of a tin-iron-chromium zirconium alloy sheet with a thickness of 0.05-0.8 mm according to claim 1, characterized in that: The absolute value of the rolling speed difference between the deflector horizontal roller and the main roller on the outlet side of the zirconium alloy plate is smaller than the absolute value of the rolling speed difference between the deflector horizontal roller and the main roller on the inlet side.

5. The process for cold rolling a tin-iron-chromium zirconium alloy sheet with a thickness of 0.05-0.8 mm according to claim 1, characterized in that: In the step S3), the rolling speed relationship during the first pressing is: V1 逆（机前浮动偏导水平轧辊） >V1 顺（冷轧机下垂直工作辊） , the rolling speed relationship during the secondary reduction is: V2 逆（冷轧机上垂直工作辊） >V2 顺（冷轧机下垂直工作辊） =V1 顺（冷轧机下垂直工作辊） , the rolling speed relationship during the three pressings is: V3 逆（冷轧机上垂直工作辊） =V2 逆（冷轧机上垂直工作辊） <V3 顺（机后浮动偏导水平轧辊） .

6. A tension block cold rolling process for a 0.05-0.8 mm thick tin-iron-chromium zirconium alloy sheet according to claim 5, characterized in that: In the step S3), the primary reduction rate, the secondary reduction rate, and the tertiary reduction rate are controlled at 10% or less, 75% or more, and 15% or less of the total reduction rate of odd-numbered passes, respectively.

7. A tension block cold rolling process for a 0.05-0.8 mm thick tin-iron-chromium zirconium alloy sheet according to claim 6, characterized in that: In the step S3), the front tension value P of the zirconium alloy plate formed between the second and third pressing 23 =4~8kN, the post-tension value P formed between the first and second compression 12 = (1.2~1.5)P 23 kN.

8. The process for cold rolling a tin-iron-chromium zirconium alloy sheet with a thickness of 0.05-0.8 mm according to claim 1, characterized in that: In the step S4), the rolling speed relationship during the first pressing is: V1 顺（机后浮动偏导水平轧辊） >V1 逆（冷轧机下垂直工作辊） , the rolling speed relationship during the secondary reduction is: V2 顺（冷轧机上垂直工作辊） >V2 逆（冷轧机下垂直工作辊） =V1 逆（冷轧机下垂直工作辊） , the rolling speed relationship during the three pressings is: V3 顺（冷轧机上垂直工作辊） =V2 顺（冷轧机上垂直工作辊） <V3 逆（机前浮动偏导水平轧辊） .

9. A tension block cold rolling process for a 0.05-0.8 mm thick tin-iron-chromium zirconium alloy sheet according to claim 8, characterized in that: In the step S4), the primary reduction rate, the secondary reduction rate, and the tertiary reduction rate are controlled at 15% or less, 60% or more, and 25% or less of the total reduction rate of even-numbered passes, respectively.

10. A tension block cold rolling process for a 0.05-0.8 mm thick tin-iron-chromium zirconium alloy sheet according to claim 9, characterized in that: In the step S4), the front tension value P of the zirconium alloy plate formed between the second and third pressing 23 =6~12kN, the post-tension value P formed between the first and second compression 12 = (1.5~2.0)P 23 kN.

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