Ultra-wide equiaxed fine-grain thin plate preparation device and preparation method

Abstract

The invention belongs to the technical field of aeronautical manufacturing, and discloses an ultra-wide equiaxial fine-grain thin plate preparation device and method, and the device comprises a workbench, a rotating table, a motor, a supporting arm and a movable pressurizing mechanism fixed to the supporting arm; the rotating table and an original blank are driven by a motor to rotate synchronously, and the original blank in a rotating state is extruded in the thickness direction through high-speed rotation and high-frequency vibration rod ball stirring, so that point-by-point kneading effect is generated on the two faces of a hot semi-solid and semi-viscous state material, crystal grain breaking, dynamic recrystallization and superplastic thinning are conducted, and the ultra-wide specification equiaxial fine-grain thin plate blank is obtained. The technical problem that an ultra-wide plate is difficult to prepare through an existing thin plate rolling technology is solved. Ultra-large-specification blank preparation can be realized by using extremely small equipment tonnage, and engineering application enforceable technology universality is high; recrystallization softening is accompanied in the blank preparation process, independent heat treatment is not needed, the procedure is simple, and the cost is low.

Description

Technical Field

[0001] The present invention belongs to the technical field of preparing thin plates by plastic deformation in aviation manufacturing, and specifically relates to a blank preparation method for improving the deep drawing processability of hard aluminum alloys, and is particularly suitable for the manufacture of ultra-wide thin-walled, equiaxed fine-grained blanks for integral forming of large nearly rotating bodies. Background Art

[0002] It is well known that rolled metal sheets have various anisotropies. Usually, the strength and plasticity of rolled sheets along the fiber direction are significantly better than those in the vertical fiber direction, but the shear fatigue strength is significantly lower than that in the vertical fiber direction. The fiber structure of the raw material will be inherited to the finished parts in the subsequent forming process, especially the parts similar to the body of revolution. After deep drawing, the fiber degree in the fiber direction of the raw material will be increased again, further reducing the shear fatigue performance of the finished product. In order to solve the above problems, domestic patent publication number CN117683984A provides a method for improving the heading fatigue performance of the annular lip of an aircraft. The principle is to achieve the purpose of reducing the various anisotropies of raw materials and semi-finished products in turn through multiple measures such as directional strengthening and forming force distribution, local thickening extrusion, annular bulging, and heat treatment. However, the main disadvantages are as follows: First, repeated deformation and heat treatment are required, the number of molds and process processes are large, and the manufacturing cost is high; second, when the semi-finished product is deformed, it is necessary to have directional use requirements for the raw material fiber according to the product shape; third, due to the limitation of the domestic sheet preparation width, larger parts cannot meet the requirements of arbitrary selection of fiber direction as needed.

[0003] Compared with iron-based alloys, titanium alloys and other materials, hard aluminum alloys have significant characteristics such as lighter weight and excellent thermal conductivity. They are the preferred materials for the pursuit of lightweight in the international aviation manufacturing field; however, the plastic forming index elongation of conventional hard aluminum alloy sheets is only 40% of that of iron-based alloys, which seriously restricts the formability of complex parts with high difficulty. Refining the raw material grains can not only reduce the influence of the anisotropy of the raw materials on the shear fatigue performance of the finished parts, but also significantly improve the strength and plasticity indicators of the materials in all directions. However, the preparation of thin metal sheets increases with the decrease of sheet thickness and the increase of width; according to the material selection range of national standard GJB2053A, the maximum widths of 0.5mm and 4.0mm thick sheets are 1500mm and 2400mm respectively. Domestic patent publication number CN103343303A provides a method for preparing fine-grained metal materials, the principle of which is to refine the metal grains by extruding the material to produce large plastic shear strain; but the disclosed technology can only prepare sample-grade and small-size bars. Therefore, preparing ultra-large thin-walled, equiaxed fine-grained billets for large near-rotating parts can not only solve the problems of insufficient overall forming billet width, poor material forming process, etc., but also avoid defects in directional mechanical properties of the drawn finished product caused by material fiber inheritance. Summary of the invention

[0004] The present invention is to solve the technical problems that the existing thin plate rolling process is difficult to prepare ultra-wide plates, cannot meet the requirements of the integral forming of ultra-large thin-walled parts close to the body of revolution, and the inherent fiber of the rolled plate is inherited to the finished product close to the body of revolution, resulting in low shear fatigue strength. An ultra-wide equiaxed fine-grained thin plate blank preparation device and preparation method are proposed. The original blank in the rotating state is stirred by high-speed rotation, high-frequency vibration rod and ball, and the thickness is squeezed to make the hot semi-solid and semi-viscous material produce point-by-point kneading effect on both sides, grain breaking, dynamic recrystallization, and superplastic thinning to obtain ultra-wide equiaxed fine-grained thin plate blank.

[0005] In order to achieve the above invention objectives, the technical solutions adopted in this application are as follows:

[0006] An ultra-wide equiaxed fine-grained thin plate preparation device, comprising:

[0007] Workbench;

[0008] A rotating table installed on the workbench is driven to rotate by a motor, a cylindrical anti-rotation insert is inlaid at the center of the upper surface of the rotating table, and a blank positioning hole is provided on the anti-rotation insert;

[0009] A support arm, one end of which is fixed to the workbench and the other end of which is suspended above the rotating table, and a walking groove is provided on the support arm;

[0010] The pressurizing mechanism includes a threaded rod, a threaded connecting rod, a circular sleeve and a back plate. The circular sleeve is installed on the support arm, and the back plate is fixedly connected to one side of the circular sleeve. The threaded connecting rod is installed in the walking groove, and one end is fixedly connected to the back plate. The threaded rod is threadedly connected to the circular sleeve, and a rod ball is provided on one end of the threaded rod. By applying radial tension or thrust to the threaded rod, the threaded rod is reciprocated in the radial direction.

[0011] As a further solution of the present invention: an air duct is provided in the threaded rod, the upper part of the air duct is a hollow polygonal column, and the lower part is a hollow tube. An air inlet pipe is fixed at the top of the hollow polygonal column, and a pneumatic rotor is fixed in the hollow tube. The rod ball is installed at the lower part of the pneumatic rotor and can rotate relative to the pneumatic rotor.

[0012] As a further solution of the present invention: the pneumatic wheel has a certain vertical activity space in the hollow tube of the threaded rod. When the pneumatic wheel ventilates, the pneumatic wheel drives the rod ball to vibrate vertically and drives the rod ball and the rotating platform to rotate in the opposite direction.

[0013] As a further solution of the present invention: two annular magnets are further provided above the pneumatic rotating top surface, and the magnetic poles of adjacent surfaces of the two annular magnets are the same.

[0014] As a further solution of the present invention: an annular positioning column is provided on the upper surface of the workbench, and a circular three-step positioning column is provided at the center of the lower surface of the rotating table, the diameter of the second step is larger than the diameters of the first step and the third step, and the third step matches the diameter and depth of the inner circle of the annular positioning column.

[0015] As a further solution of the present invention: the depth of the blank positioning hole of the anti-rotation insert of the rotating table is less than the thickness of the anti-rotation insert, and the distance and angle between any two adjacent positioning holes and the central axis of the rotating table are equal.

[0016] As a further solution of the present invention: the inner circle bottom of the workbench annular positioning column and the bottom of the third step of the turntable are respectively provided with hemispherical surfaces that match each other, the upper surface of the workbench annular positioning column and the lower surface of the second step of the turntable are respectively provided with a lower semicircular annular groove and an upper semicircular annular groove, the lower semicircular annular groove and the upper semicircular annular groove are butt-jointed to form a circular annular groove, and a number of sliding balls are fixed in the annular groove.

[0017] As a further solution of the present invention: a plurality of fixed plates are connected to the lower part of the motor, and a step rotating shaft is provided at the upper part. The step rotating shaft is connected to the first step of the turntable through a belt, and the upper surface of the workbench and the motor fixing plate are provided with matching oblong adjustment holes, and the direction of the adjustment hole is parallel to the line connecting the central axis of the turntable and the axis center of the motor step rotating shaft.

[0018] A method for preparing an ultra-wide equiaxed fine-grained thin plate, using the above-mentioned thin plate preparation device to prepare an ultra-wide thin plate equiaxed fine-grained aluminum alloy target billet, comprising the following steps:

[0019] 1) Aluminum alloy original billet production: According to the target billet radius and thickness, a thick plate with appropriate inner and outer diameters and thickness is selected to produce an annular original billet. The inner circle of the original billet is provided with a positioning hole that matches the position of the anti-rotation insert of the rotating table;

[0020] 2) Debugging of the pressurizing mechanism: After the thick plate annular original blank is fixed on the upper surface of the rotating table with the positioning hole, the threaded connecting rod is rotated to make the circular sliding sleeve and the threaded rod move radially along the support arm to the predetermined position, and the threaded rod is rotated to make the rotating rod ball exert appropriate pressure on the original blank;

[0021] 3) Spinning preparation: Start the motor to drive the rotating table to rotate synchronously with the original blank, and introduce compressed hot air from the air inlet pipe of the threaded rod. After preheating the original blank, test spinning is performed, and the corresponding relationship between the downward pressure increment of the threaded rod and the thinning amount of the blank during the test spinning is measured;

[0022] 4) Spinning of the first blank: gradually increase the downward pressure of the threaded rod, rotate the threaded connecting rod to make the threaded rod move cyclically in the radial direction, rotate, vibrate the rod ball to stir, and extrude the original blank in the thickness direction, so that the hot semi-solid and semi-viscous material front side produces a point-by-point kneading effect, grain breaking, dynamic recrystallization, and superplastic thinning to obtain the first annular blank;

[0023] 5) Spinning the second blank: Move the threaded rod to the preset spinning point, flip the first blank, and spin the outer side of the spinning point of the first blank to reduce the thickness to the target blank, so as to obtain a second annular blank with a larger area;

[0024] 6) Spinning of target blank: Flip the anti-rotation insert to press the outer edge of the annular second blank, spin and thin the inner side of the second blank starting point, and gradually reduce its inner diameter until it is stirred and welded to obtain a solid circular target blank.

[0025] As a further solution of the present invention: the incremental control method of the downward pressure of the pressurizing mechanism is: gradually reducing the ultra-thin plate gasket below the hollow polygonal column of the threaded rod, the gasket is made of high-strength hard alloy and its thickness is not more than 0.05mm.

[0026] As a further solution of the present invention: the temperature of the compressed hot gas introduced into the air inlet pipe of the threaded rod is no higher than 280°C, and the compressed hot gas does not chemically react with the aluminum alloy in an environment below 400°C.

[0027] As a further solution of the present invention: when the first blank is spun, the pressure motion trajectory of the threaded rod is: moving centrifugally along the radial direction from the inner circle of the original blank; when the second blank is spun, the pressure motion trajectory of the threaded rod is: moving centrifugally along the radial direction from the starting point; when the target blank is spun, the pressure motion trajectory of the threaded rod is: moving centrifugally along the radial direction from the starting point.

[0028] As a further solution of the present invention: the thickness and radius of the original blank are calculated as follows: T = T2*R2 2 / (R 2 -r 2 ); When the first blank is spun, its thickness is calculated as follows: T1≤T2+(T-T2)*50%; When the target blank is spun, the radius of the arc at the starting point is calculated as follows: R1 2 =r 2 *T1 / (T1-T2); wherein the letters T, T1, T2, R, R1, R2, and r respectively refer to the original blank thickness, the first blank thickness, the target blank thickness, the original blank outer circle radius, the starting point arc radius, the target blank radius, and the original blank inner circle radius.

[0029] Compared with the prior art, the beneficial effects of this application are:

[0030] 1. This application can realize the preparation of ultra-wide specification blanks with extremely small equipment pressure, and the technical versatility of engineering applications is strong.

[0031] 2. The blank preparation process of the present application is accompanied by recrystallization softening, and no separate heat treatment is required, so the process is simple and the cost is low.

[0032] 3. The blank prepared in this application has uniform isotropic properties and significant grain refinement, which can improve the plastic forming processability of the material and the mechanical properties of the processed product.

[0033] The present application is further described below in conjunction with the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0035] In the attached picture:

[0036] Figure 1 A schematic diagram of the overall structural principle of the device prepared for this application;

[0037] Figure 2 This is a schematic diagram of the structure of the rotating table of the preparation device of this application from a side view;

[0038] Figure 3 A schematic diagram of the working table structure of the preparation device for this application;

[0039] Figure 4 This is a schematic diagram of the structure of the rotating table of the preparation device for this application from a side upward perspective;

[0040] Figure 5 This is a schematic diagram of the cross-sectional structure of the device for preparing the present application along the direction of the support arm;

[0041] Figure 6 This is a schematic diagram of the structure of the pressurizing mechanism of the preparation device for this application;

[0042] Figure 7 A schematic diagram showing the enlarged principle of preparing the first blank from the original blank of the present application;

[0043] Figure 8 This is a schematic diagram of the enlarged principle of preparing the target billet for the second billet of this application.

[0044] Explanation of the reference numerals in the figure: 1. workbench, 2. rotating table, 3. motor, 4. supporting arm, 5. pressurizing mechanism, 6. annular positioning column, 7. anti-rotation insert, 8. positioning hole, 9. first step, 10. second step, 11. third step, 12. fixing plate, 13. rotating shaft, 14. belt, 15. threaded rod, 16. threaded connecting rod, 17. circular sliding sleeve, 18. back plate, 19. air intake pipe, 20. pneumatic drive, 21. rod ball, 22. adjusting hole, 23. central axis, 24. hemispherical surface, 25. annular groove, 26. sliding ball, 27. annular magnet, 28. original blank, 29. first blank, 30. second blank, 31. target blank, 32. rotation point, 33. gasket. DETAILED DESCRIPTION

[0045] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. 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 embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0046] First, the technical solution of the ultra-wide equiaxed fine-grained thin plate preparation device of the present application is introduced.

[0047] Refer to the attached Figure 1 To Attachment Figure 8 , the preparation device comprises a workbench 1, a rotating table 2, a motor 3, a support arm 4 and a mobile pressurizing mechanism 5 fixed to the support arm. The workbench 1 is fixed to the ground by supporting feet, and an annular positioning column 6 is provided on the upper surface of the workbench 1. A cylindrical anti-rotation insert 7 is inlaid in the center of the upper surface of the rotating table 2, and a blank positioning hole 8 is provided on the anti-rotation insert 7. A circular three-step positioning column is provided in the center of the lower surface of the rotating table 2, and the diameter of the second step 10 is greater than the diameter of the first step 9 and the third step 11. The third step 11 matches the diameter and depth of the inner circle of the workbench annular positioning column 6. The lower part of the motor 3 is connected to a plurality of fixed plates 12, and the upper part is provided with a step rotating shaft 13, which is connected to the first step 9 of the rotating table by a belt 14. One end of the support arm 4 is fixed to the workbench 1, and the other end is suspended above the rotating table 2. The pressurizing mechanism 5 is provided with a threaded rod 15, a threaded connecting rod 16, a circular sleeve 17, and a back plate 18. The threaded rod 15 passes through the circular sleeve to control the vertical displacement; the threaded connecting rod 16 passes through the support arm and is connected to the back plate 18, applying radial tension or thrust to the threaded rod 15, so that it moves back and forth slowly and at a uniform speed in the radial direction.

[0048] Further, see Attachment Figure 1 , Attachment Figure 2In order to refine the target blank 31 by double-sided spinning of the thick plate original blank 28, it is convenient for the blank preparation process to turn over and position the anti-rotation insert 7 with the blank. The depth of the blank positioning hole 8 of the anti-rotation insert 7 of the rotating table 2 is less than the thickness of the anti-rotation insert 7, and the distance and angle between any two adjacent positioning holes 8 and the central axis 23 of the rotating table are equal.

[0049] Further, see Attachment Figure 1 , Attachment Figure 3 In order to facilitate the adjustment of the tightness of the belt 14 during use, the upper surface of the workbench 1 and the motor fixing plate are provided with matching oblong adjustment holes 22, the direction of which is parallel to the axis connecting the central axis 23 of the rotating table and the axis of the motor rotating shaft 13.

[0050] Further, see Attachment Figure 1 , Attachment Figure 5 In order to prevent the rotating table 2 from rotating and swinging at high speed and reduce the friction between the rotating table 2 and the working table annular positioning column 6; the inner circle bottom of the working table annular positioning column 6 and the bottom of the third step 11 of the rotating table are respectively provided with mutually matching hemispherical surfaces 24.

[0051] Further, see the attached Figure 1 , Attachment Figure 3 To Attachment Figure 5 In order to further reduce the friction resistance of the rotating table 2, a lower semicircular annular groove and an upper semicircular annular groove are respectively provided on the upper surface of the annular positioning column 6 of the worktable 1 and the lower surface of the second step 10 of the rotating table. The lower semicircular annular groove and the upper semicircular annular groove are connected to each other to form a closed annular groove 25, and a plurality of sliding balls 26 are provided in the annular groove 25.

[0052] Further, see Attachment Figure 1 , Attachment Figure 7 , Attachment Figure 8 In order to disturb the fiber structure of the raw material by stirring, the threaded rod 15 of the pressurizing mechanism has a hollow polygonal column at the top and a hollow tube at the bottom; an air inlet pipe 19 is fixed to the top of the hollow polygonal column, a pneumatic rotor 20 is arranged in the hollow tube, and a rotating rod ball 21 is installed at the bottom of the pneumatic rotor. The pneumatic rotor 20 has a certain vertical activity space in the hollow tube of the threaded rod 15.

[0053] Further, see the attached Figure 7 , Attachment Figure 8 In order to increase the stirring effect of the rod ball 21 on the blank and reduce the friction of the rod ball 21 on the blank; when the pneumatic wheel 20 is ventilated, the pneumatic wheel drives the rod ball 21 to vibrate vertically and drives the rod ball 21 and the rotating table 2 to rotate in the opposite direction.

[0054] Furthermore, see the attached Figure 7 , Attachment Figure 8Two annular magnets 27 are also fixed on the top surface of the pneumatic rotor 20. The magnetic poles of the adjacent surfaces of the two annular magnets 27 are the same. The purpose is to utilize the close-range repulsive force of the same-pole magnetic force to ensure that the rod ball 21 has sufficient pressure on the blank, while leaving vibration space to reduce the friction of the rod ball 21 on the blank.

[0055] Secondly, the method of using the thin plate preparation device of the present application to prepare equiaxed fine-grained thin plates is introduced.

[0056] Use the above-mentioned thin plate preparation device to make ultra-wide thin plate equiaxed fine-grained aluminum alloy thin plates, refer to the attached Figure 1 , Attachment Figure 5 , Attachment Figure 7 , Attachment Figure 8 , which mainly includes the following steps:

[0057] 1) Aluminum alloy original billet production: According to the radius and thickness of the target billet 31, a thick plate annular original billet 28 with appropriate inner and outer diameters and thickness is selected, and the inner circle of the original billet 28 is provided with a positioning hole 8 that matches the position of the rotating table anti-rotation insert 7.

[0058] 2) Debugging of the pressurizing mechanism: After the thick plate annular original blank 28 is fixed on the upper surface of the rotating table 2 with the positioning hole 8, the threaded connecting rod 16 is rotated to make the circular sliding sleeve 17 and the threaded rod 15 move radially along the support arm 4 to a predetermined position, and the threaded rod 15 is rotated to make the rotating rod ball 21 apply appropriate pressure to the original blank 28.

[0059] 3) Spinning preparation: Start the motor 3 to drive the rotary table 2 to rotate synchronously with the original blank 28, and introduce compressed hot air from the air inlet pipe 19 of the threaded rod 15. After preheating the original blank 28, try spinning, and measure the corresponding relationship between the downward pressure increment of the threaded rod 15 and the thinning amount of the blank during the trial spinning.

[0060] 4) Spinning of the first blank: gradually increase the downward pressure of the threaded rod 15, rotate the threaded connecting rod 16 to make the threaded rod 15 move circularly in the radial direction, rotate and vibrate the rod ball 21 to stir and extrude the original blank 28 in the thickness direction, so that the hot semi-solid and semi-viscous material front side produces a point-by-point kneading effect, grain breaking, dynamic recrystallization, and superplastic thinning to obtain a ring-shaped first blank 29.

[0061] 5) Spinning the second blank: Move the threaded rod 15 to the preset spinning point 32, flip the first blank 29, and spin the outer side of the spinning point 32 of the first blank to reduce the thickness to the target blank 31, so as to obtain a larger annular second blank 30.

[0062] 6) Spinning of target blank: Flip the anti-rotation insert 7 to press the outer edge of the annular second blank 30, spin and thin the inner side of the second blank starting point 32, and gradually reduce its inner diameter until it is stirred and welded to obtain a solid circular target blank 31.

[0063] Furthermore, in order to reduce the pressure requirements of the equipment and reduce friction resistance, the material needs to be heated appropriately, but the appropriate temperature needs to be controlled; during the process of spinning the original blank 28 into the target blank 31, the air inlet pipe 19 of the threaded rod is passed with compressed hot gas. For aluminum alloy, the temperature of the compressed hot gas is not higher than 280°C. The purpose is to make the metal that has been strongly deformed to dynamically recrystallize and refine the grains. In order to reduce the cost of gas, the compressed hot gas does not chemically react with the aluminum alloy at 400°C. For aluminum alloy, the gas can be nitrogen, carbon dioxide and other chemically inactive low-cost gases. It should be emphasized that for other metals, the temperature and type of gas used should be determined according to the metal deformation recrystallization temperature and specific chemical properties.

[0064] Further, see Attachment Figure 8 , in order to improve the wall thickness accuracy of the target blank 31; the pressing mechanism 5 presses down the incremental control method by gradually reducing the ultra-thin plate gasket 33 below the hollow polygonal column of the threaded rod 15. The gasket 33 is made of high-strength hard alloy and its thickness is not more than 0.05mm. It should be noted that the wall thickness accuracy mainly depends on the press increment of the rod ball 21 during the final spinning. As long as it does not affect factors such as friction, the press amount of the rod ball 21 can be appropriately increased before the final spinning to improve efficiency.

[0065] Further, see Attachment Figure 5 , Attachment Figure 7 , Attachment Figure 8 In order to operate correctly, the essence of thinning spinning is to gradually roll the inner thick material outward to increase the surface area, but the ultimate goal of this application is to prepare a solid target blank 31. When the first blank 29 is spun, the pressure motion trajectory of the threaded rod 15 is: moving radially centrifugally from the inner circle of the original blank 28. When the second blank 30 is spun, the pressure motion trajectory of the threaded rod 15 is: moving radially centrifugally from the starting point 32. When the target blank 31 is spun, the pressure motion trajectory of the threaded rod 15 is: moving radially centrifugally from the starting point 32.

[0066] Furthermore, in order to minimize the waste of raw materials, the thickness and radius of the original blank 28 are calculated as follows: T = T2*R2 2 / (R 2 -r 2); The limit size of the target blank 31 can be calculated based on the existing known raw material specifications. Conversely, the specifications of the original blank 28 can be calculated based on the actual required target blank 31 size. The principle is that the volume or weight remains unchanged before and after forming. In order to ensure the uniformity of the double-sided structure performance of the target blank 31, the thickness calculation formula of the first blank 29 during spinning is as follows: T1≤T2+(T-T2)*50%; its purpose is to increase the material kneading effect through double-sided stirring and extrusion to refine the grains. In order to achieve the purpose of stirring and welding the center of the target blank 31 and avoid excessive material accumulation, the calculation formula for the radius of the arc corresponding to the spinning point 32 during spinning of the target blank 31 is as follows: R1 2 =r 2 *T1 / (T1-T2); wherein the letters T, T1, T2, R, R1, R2, and r respectively refer to the thickness of the original blank 28, the thickness of the first blank 29, the thickness of the target blank 31, the outer radius of the original blank 28, the arc radius of the starting point 32, the radius of the target blank 31, and the inner radius of the original blank 28.

[0067] So far, the purpose of the present invention has been achieved.

[0068] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An ultra-wide equiaxed fine-grained thin plate preparation device, characterized in that: include: Workbench; A rotating table installed on the workbench is driven to rotate by a motor, a cylindrical anti-rotation insert is inlaid at the center of the upper surface of the rotating table, and a blank positioning hole is provided on the anti-rotation insert; A support arm, one end of which is fixed to the workbench and the other end of which is suspended above the rotating table, and a walking groove is provided on the support arm; The pressurizing mechanism includes a threaded rod, a threaded connecting rod, a circular sleeve and a back plate. The circular sleeve is installed on the support arm, and the back plate is fixedly connected to one side of the circular sleeve. The threaded connecting rod is installed in the walking groove, and one end is fixedly connected to the back plate. The threaded rod is threadedly connected to the circular sleeve, and a rod ball is provided on one end of the threaded rod. By applying radial tension or thrust to the threaded rod, the threaded rod is reciprocated in the radial direction.

2. The ultra-wide equiaxed fine-grained thin plate preparation device according to claim 1 is characterized in that: An airway is provided in the threaded rod, the upper part of the airway is a hollow polygonal column, the lower part is a hollow tube, an air inlet pipe is fixed at the top of the hollow polygonal column, a pneumatic rotor is fixed in the hollow tube, the rod ball is installed at the lower part of the pneumatic rotor and can rotate relative to the pneumatic rotor.

3. The ultra-wide equiaxed fine-grained thin plate preparation device according to claim 2 is characterized in that: The pneumatic rotor has a certain vertical movement space in the hollow tube of the threaded rod.

4. The ultra-wide equiaxed fine-grained thin plate preparation device according to claim 3 is characterized in that: Two annular magnets are also arranged above the pneumatic rotating top surface, and the magnetic poles of the adjacent surfaces of the two annular magnets are the same.

5. The ultra-wide equiaxed fine-grained thin plate preparation device according to any one of claims 1 to 4, characterized in that: An annular positioning column is provided on the upper surface of the workbench, and a circular three-step positioning column is provided at the center of the lower surface of the rotating table. The diameter of the second step is larger than the diameters of the first and third steps, and the third step matches the diameter and depth of the inner circle of the annular positioning column.

6. The ultra-wide equiaxed fine-grained thin plate preparation device according to claim 5, characterized in that: The depth of the blank positioning hole of the anti-rotation insert of the rotating table is less than the thickness of the anti-rotation insert, and the distance and angle between any two adjacent positioning holes and the central axis of the rotating table are equal.

7. The ultra-wide equiaxed fine-grained thin plate preparation device according to claim 5, characterized in that: The inner circle bottom of the workbench annular positioning column and the bottom of the third step of the rotating table are respectively provided with hemispherical surfaces that match each other, and the upper surface of the workbench annular positioning column and the lower surface of the second step of the rotating table are respectively provided with a lower semicircular annular groove and an upper semicircular annular groove, the lower semicircular annular groove and the upper semicircular annular groove are butted against each other to form an annular groove, and a number of sliding balls are fixed in the annular groove.

8. The device for preparing ultra-wide equiaxed fine-grained thin plates according to claim 7, characterized in that: The lower part of the motor is connected to several fixed plates, and the upper part is provided with a step rotating shaft, which is connected to the first step of the rotating table through a belt. The upper surface of the workbench and the motor fixing plate are provided with matching oblong adjustment holes, and the direction of the adjustment hole is parallel to the connecting line between the central axis of the rotating table and the axis center of the motor step rotating shaft.

9. A method for preparing an ultra-wide equiaxed fine-grained thin plate, using the thin plate preparation device according to any one of claims 2 to 8 to prepare an ultra-wide thin plate equiaxed fine-grained aluminum alloy target billet, characterized in that: The steps include: 1) Aluminum alloy original billet production: According to the target billet radius and thickness, a thick plate with appropriate inner and outer diameters and thickness is selected to produce an annular original billet. The inner circle of the original billet is provided with a positioning hole that matches the position of the anti-rotation insert of the rotating table; 2) Debugging of the pressurizing mechanism: After the thick plate annular original blank is fixed on the upper surface of the rotating table with the positioning hole, the threaded connecting rod is rotated to make the circular sliding sleeve and the threaded rod move radially along the support arm to the predetermined position, and the threaded rod is rotated to make the rotating rod ball exert appropriate pressure on the original blank; 3) Spinning preparation: Start the motor to drive the rotating table to rotate synchronously with the original blank, and introduce compressed hot air from the air inlet pipe of the threaded rod. After preheating the original blank, test spinning is performed, and the corresponding relationship between the downward pressure increment of the threaded rod and the thinning amount of the blank during the test spinning is measured; 4) Spinning of the first blank: gradually increase the downward pressure of the threaded rod, rotate the threaded connecting rod to make the threaded rod move cyclically in the radial direction, rotate, vibrate the rod ball to stir, and extrude the original blank in the thickness direction, so that the hot semi-solid and semi-viscous material front side produces a point-by-point kneading effect, grain breaking, dynamic recrystallization, and superplastic thinning to obtain the first annular blank; 5) Spinning the second blank: Move the threaded rod to the preset spinning point, flip the first blank, and spin the outer side of the spinning point of the first blank to reduce the thickness to the target blank, so as to obtain a second annular blank with a larger area; 6) Spinning of target blank: Flip the anti-rotation insert to press the outer edge of the annular second blank, spin and thin the inner side of the second blank starting point, and gradually reduce its inner diameter until it is stirred and welded to obtain a solid circular target blank.

10. The method for using the ultra-wide equiaxed fine-grained thin plate preparation device according to claim 9, characterized in that: The incremental control method of the downward pressure of the pressurizing mechanism is: gradually reducing the ultra-thin plate gasket below the hollow polygonal column of the threaded rod, the gasket is made of high-strength hard alloy and its thickness is not more than 0.05mm.

Images