CT machine barrel flange ring forming tool and forming method

Abstract

The invention discloses a CT machine barrel flange ring forming tool and a forming method. The CT machine barrel flange ring forming tool comprises a first roll shaft set or a second roll shaft set which is arranged on two adjusting handle seats correspondingly. The first roller shaft group comprises a cylindrical first upper roller and two first lower rollers; concave-convex structures matched with each other are arranged on the first upper roller and the first lower rollers, the first upper roller is driven by an adjusting handle to move up and down, and the second roller shaft set comprises a second upper roller and two second lower rollers; the second upper roller is driven by an adjusting handle to move up and down; a cylindrical section and a circular truncated cone section are correspondingly formed on the second upper roller and the second lower roller, and the outer surfaces of the circular truncated cone sections are complementary; the concave-convex structure is located at the joint of the cylindrical section and the circular truncated cone section. The plate bending machine has the advantages that concave-convex structures matched with each other are arranged on the roll shafts to adapt to the shape of a plate, and meanwhile, the roll shafts on the second roll shaft group are locally arranged to be in a circular truncated cone shape, so that the plate subjected to primary bending forming is subjected to secondary machining, the profile tolerance of the plate is corrected, and the use requirement is met.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical manufacturing, and in particular relates to a CT machine barrel flange ring forming tool and a forming method. Background Art

[0002] Sheet metal rolling is a critical step in the manufacturing process of computed tomography (CT) machines. Conventional sheet metal rolling tooling faces a number of technical challenges when handling sheet metal used inside CT machines. Sheets inside CT machines often have unique Figure 1a to Figure 1b The "J"-shaped cross section shown is designed to meet specific assembly and functional requirements, and this structure gives the bracket a certain degree of rigidity and stability. However, due to the particularity of the sheet cross section, the commonly used sheet rolling method or equipment cannot be applied. In addition, due to the inconsistent lengths at both ends of the sheet, a series of problems occurred during the rolling process.

[0003] First, due to the forming stress and the ductility of the material, traditional curling tools often have difficulty in accurately controlling the shape of the sheet during the forming process. This may result in the finished product presenting an unexpected conical shape, or the arc diameter at one end being significantly larger than the other, thus affecting the contour of the product and the accuracy of the final assembly.

[0004] In addition, existing roll forming tools often lack adaptability to the inconsistent lengths of the two ends of the plate, which increases the difficulty of forming in actual operation and may lead to inconsistency in product size. This inconsistency not only affects the assembly accuracy of the internal components of the CT machine, but may also have an adverse effect on the overall performance and stability of the machine.

[0005] In order to solve the above problems, designing a CT machine barrel flange ring forming tool and a forming method is an important technical problem that the technicians in this field need to solve. Summary of the invention

[0006] The purpose of the present invention is to solve the above problems existing in the prior art and to provide a CT machine barrel flange ring forming tool and a forming method.

[0007] The purpose of the present invention is achieved through the following technical solutions:

[0008] The CT machine barrel flange ring forming tool comprises a first roller group or a second roller group respectively arranged on two adjustment handle seats; the first roller group comprises a cylindrical first upper roller and two first lower rollers arranged in parallel and coplanar manner; the first upper roller is centered between the two first lower rollers, and the circumferential surfaces of the two rollers are provided with mutually matching concave-convex structures, and the first upper roller is driven by the adjustment handle to move up and down to adapt to plates of different thicknesses; the second roller group comprises a second upper roller and two second lower rollers arranged in parallel and coplanar manner; the second upper roller is driven by the adjustment handle to move up and down; the second upper roller is centered between the two second lower rollers; the second upper roller and the second lower roller are correspondingly formed with cylindrical sections and frustum sections, and the outer surfaces of the frustum sections of the two rollers are complementary; the concave-convex structure is located at the connection between the cylindrical section and the frustum section.

[0009] Preferably, the adjustment handle and the adjustment handle are arranged at the top end of the adjustment handle seat and pass through the adjustment handle seat; the output ends of the adjustment handle and the adjustment handle are respectively fixedly connected to the ends of the first upper roller and the second upper roller to drive the first upper roller or the second upper roller to move relative to the first lower roller or the second lower roller.

[0010] Preferably, there are two adjusting handles and two adjusting handles, which are respectively arranged at the two ends of the first upper roller and the second upper roller to control the overall parallel lifting and lowering of the first upper roller or the second upper roller.

[0011] Preferably, both ends of the first lower roller and the second lower roller are fixed on the adjustment handle seat; the ends of the first upper roller and the second upper roller are connected to the output end of the driving motor and are driven to rotate by the driving motor.

[0012] Preferably, the two first lower rollers and the two second lower rollers are arranged at intervals.

[0013] Preferably, the bending angle R in the concave-convex structure is not less than the thickness of the plate.

[0014] The method for forming a CT machine barrel flange ring, using any of the above-mentioned CT machine barrel flange ring forming tooling, comprises the following steps:

[0015] S1, according to the formula The bending moments of the first upper roller, the first lower roller, the second upper roller and the second lower roller are obtained; wherein, M is the bending moment, K1 is the cross-sectional shape coefficient, K0 is the relative strengthening coefficient, t is the thickness of the plate, R1 is the relative curvature radius, W is the cross-sectional modulus, and σs is the tensile strength;

[0016] S2, according to the formula The forces on the first upper roller and the second upper roller are calculated; according to the formula The forces of the first lower roller and the second lower roller are calculated; wherein M is the bending moment obtained in step S1, R1 is the preset radius of the first upper roller and the second upper roller, or the first lower roller and the second lower roller, and t is the thickness of the plate;

[0017] S3, calculating the torque of the first upper roller and the second upper roller according to the formula T=Fa2*R1; calculating the torque of the first lower roller and the second lower roller according to the formula T=Fc2*R1;

[0018] S4, according to the formula The diameters of the first upper roller, the first lower roller, the second upper roller and the second lower roller are calculated according to the strength; wherein T is the torque obtained in step S3, and ζ is the material coefficient of the plate;

[0019] S5, according to the formula The button torque is used to calculate the diameters of the first upper roller, the first lower roller, the second upper roller and the second lower roller; wherein T is the torque obtained in step S3, and L is the length of the first upper roller or the first lower roller or the second upper roller or the second lower roller;

[0020] S6, comparing the values ​​of d1 and d2, and tentatively setting the larger value as the diameter of the first upper roller, the first lower roller, and the diameter of the cylindrical section in the second upper roller and the second lower roller;

[0021] S7, according to the radius of the standard part formed by rolling*0.8, the maximum value of the first upper roller and the second upper roller is obtained, and the value is compared with the diameter temporarily determined in step S6; if the temporary diameter is not greater than the maximum value of the first upper roller and the second upper roller, the temporary diameter is used as the final diameter of the first upper roller and the first lower roller; otherwise, return to step S2 to reset the roller radius R1;

[0022] S8, placing the plate on the first roller assembly, and the adjusting handle drives the first upper roller to descend until it contacts the plate;

[0023] S9, starting the driving motor on the first lower roller to drive the first lower roller and the first upper roller to rotate, so as to drive the plate to bend, thereby realizing the initial bending process of the plate;

[0024] S10, determining the springback amount r according to the error value between the height difference of the plate after the first bending forming and the height difference of the plate after the final forming;

[0025] S11, according to the formula tanα=r / L, the inclination angle of the circumferential surface of the truncated cone segment in the second roller group is obtained; wherein tanα is the inclination angle, r is the rebound amount, and L is the length of the plate in contact with the truncated cone segment;

[0026] S12. After the plate after the initial bending process is placed on the second roller set, the adjusting handle drives the second upper roller to descend until it contacts the plate.

[0027] S13. Start the drive motor on the second lower roller to drive the second lower roller and the second upper roller to rotate, so as to drive the plate to be corrected and bent to form a flange ring that meets the standards.

[0028] Preferably, the relative curvature radius R1 = R / t in step S1, where R is the bending radius of the plate; the section modulus W of the cross-section = Bt 2 / 6, where B is the width of the plate.

[0029] The advantages of the technical solution of the present invention are mainly reflected in:

[0030] Matching concave and convex structures are provided on the rollers to adapt to the shape of the plate. At the same time, the rollers on the second roller set are partially set in a frustum shape, and the outer surface of the frustum is used to perform secondary processing on the plate after the initial bending and forming, and the straightness of the plate is corrected to meet the use requirements;

[0031] A three-roller plate bending machine is adopted, and the rollers in the first roller set and the second roller set are distributed in an isosceles triangle shape, forming a symmetric three-roller plate bending machine, so as to ensure that the force on the plate is more uniform and stable during the simultaneous processing, and further enable the plate to be effectively bent;

[0032] By respectively arranging adjusting handles at both ends of the first upper roller and the second upper roller to drive the first upper roller and the second upper roller to move up and down as a whole in parallel, the levelness of the rollers during the lifting process is ensured. Furthermore, the force on the rollers as a whole is made uniform during the processing, and at the same time, the force exerted on the plate is also made more uniform, so that the thickness of the processed and formed plate is symmetrical;

[0033] The radii of the first upper roller, the first lower roller, the second upper roller and the second lower roller are calculated by formulas, so that the springback amount between the plate initially rolled and formed and the standard is small, and the correction can be achieved by secondary rolling, meeting the requirements for the rolling and forming of the plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1a : Cross-sectional view of the "Ji" shaped structure in the background art of the present invention;

[0035] Figure 1b : Top view of the "Ji" shaped structure in the background art of the present invention;

[0036] Figure 2a : Front view of the first roller set in the preferred embodiment of the present invention;

[0037] Figure 2b : An end view of the first roller assembly of a preferred embodiment of the present invention;

[0038] Figure 3a : A partial front view of step S4 of a preferred embodiment of the present invention;

[0039] Figure 3b : A partial end view of step S4 of a preferred embodiment of the present invention;

[0040] Figure 4a : A partial front view of step S5 of a preferred embodiment of the present invention;

[0041] Figure 4b : A partial end view of step S5 of a preferred embodiment of the present invention;

[0042] Figure 5 : A partial front view of step S8 of a preferred embodiment of the present invention;

[0043] Figure 6 : A partial end view of step S9 of a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0044] The purpose, advantages and features of the present invention will be illustrated and explained by the non-limiting description of the following preferred embodiments. These embodiments are only typical examples of the application of the technical solution of the present invention, and any technical solution formed by equivalent replacement or equivalent transformation falls within the scope of protection claimed by the present invention.

[0045] In the description of the scheme, it should be noted that the terms "center", "up", "down", "left", "right", "front", "back", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of description and simplified description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance. Moreover, in the description of the scheme, with the operator as a reference, the direction close to the operator is the proximal end, and the direction away from the operator is the distal end.

[0046] The present invention discloses a CT machine barrel flange ring forming tool and a forming method. Among them, a CT machine barrel flange ring forming tool includes a first roller group 1 or a second roller group 2 respectively arranged on two adjustment handle seats 100. The first roller group 1 includes a cylindrical first upper roller 11 and two parallel and coplanar first lower rollers 12. The circumferential surfaces of the first upper roller 11 and the first lower roller 12 are provided with mutually matching concave-convex structures 121, and the minimum value of the bending angle R in the concave-convex structure 121 is equal to the thickness of the plate. The R value of the bending angle can be adjusted according to the processing requirements, and its specific value is not limited here. The first upper roller 11 is driven by the adjustment handle 13 to move up and down to adapt to plates of different thicknesses.

[0047] Furthermore, the adjustment handle 13 is disposed at the top of the adjustment handle seat 100 and penetrates the adjustment handle seat 100; the output end of the adjustment handle 13 is fixedly connected to the end of the first upper roller 11 to drive the first upper roller 11 to move relative to the first lower roller 12. Furthermore, there are two adjustment handles 13, which are respectively disposed at the two ends of the first upper roller 11 to control the overall parallel lifting and lowering of the first upper roller 11, to ensure the horizontality of the first upper roller 11 during the lifting and lowering process, so that the first upper roller 11 is uniformly stressed during the processing, and at the same time, the force applied to the plate is more uniform, so that the thickness of the processed plate is uniform.

[0048] The second roller group 2 includes a second upper roller 21 and two second lower rollers 22 arranged in parallel and coplanar. The second upper roller 21 is driven to move up and down by an adjustment handle 13. Specifically, the adjustment handle 13 is arranged at the top of the adjustment handle seat 100 and passes through the adjustment handle seat 100; the output end of the adjustment handle 13 is fixedly connected to the end of the second upper roller 21 to drive the second upper roller 21 to move relative to the second lower roller 22. Furthermore, the present application preferably has two adjustment handles 13, which are respectively arranged at the two ends of the first upper roller 11 and the second upper roller 21 to control the parallel lifting and lowering of the first upper roller 11 or the second upper roller 21 as a whole. In other embodiments, the adjustment handle 13 and the adjustment handle 13 can also be connected by a linkage component to achieve synchronous rotation, thereby driving the first upper roller 11 and the second upper roller 21 to lift and lower at the same amplitude at both ends.

[0049] As shown in the figure, in the second roller group 2, a cylindrical section 201 and a truncated cone section 202 are formed on the second upper roller 21 and the second lower roller 22 respectively, and the concave-convex structure 121 is located at the connection between the cylindrical section 201 and the truncated cone section 202. The concave-convex structure 121 is consistent with the concave-convex structure 121 in the first roller group 1, and will not be described in detail here. The outer surfaces of the truncated cone sections 202 on the second upper roller 21 and the second lower roller 22 are complementary, and are in contact with the longer side of the outer edge of the plate. The second roller group 2 is partially set to a truncated cone shape, and the outer surfaces of the second upper roller 21 and the second lower roller 22 are complementary. The plate is corrected during the secondary rolling process so that the longer outer edge is bent toward the convex surface of the plate, and the contour of the final formed flange ring meets the standard requirements, that is, the contour reaches ±1.

[0050] As shown in the figure, both ends of the first lower roller 12 and the second lower roller 22 are fixed on the adjustment handle seat 100. Further, the ends of the first upper roller 11 and the second upper roller 21 are connected to the output end of the driving motor 122, and are driven to rotate by the driving motor 122.

[0051] Furthermore, the two first lower rollers 12 and the two second lower rollers 22 are arranged at intervals. The first upper roller 11 is centered between the two first lower rollers 12, and the second upper roller 21 is centered between the two second lower rollers 22. The rollers in the first roller group 1 and the second roller group 2 are distributed in an isosceles triangle shape to ensure that the force on the plate is more uniform and stable during the processing, thereby effectively bending the plate.

[0052] The method for forming a CT machine barrel flange ring, using any of the above-mentioned CT machine barrel flange ring forming tooling, comprises the following steps:

[0053] S1, according to the formula The bending moments of the first upper roller 11, the first lower roller 12, the second upper roller 21 and the second lower roller 22 are obtained; wherein M is the bending moment, K1 is the cross-sectional shape coefficient, K0 is the relative strengthening coefficient, t is the thickness of the plate, R1 is the relative curvature radius, W is the section modulus of the cross section, and σs is the tensile strength. Further, the relative curvature radius R1 = R / t, wherein R is the bending radius of the plate; the section modulus of the cross section W = Bt2 / 6, wherein B is the width of the plate.

[0054] S2, according to the formula The forces on the first upper roller 11 and the second upper roller 21 are calculated; according to the formula The forces on the first lower roller 12 and the second lower roller 22 are calculated; wherein M is the bending moment obtained in step S1, R1 is the preset radius of the first upper roller 11 and the second upper roller 21, or the first lower roller 12 and the second lower roller 22, and t is the thickness of the plate.

[0055] S3, the torques of the first upper roller 11 and the second upper roller 21 are calculated according to the formula T=Fa2*R1; the torques of the first lower roller 12 and the second lower roller 22 are calculated according to the formula T=Fc2*R1.

[0056] S4, according to the formula The diameters of the first upper roller 11, the first lower roller 12, the second upper roller 21 and the second lower roller 22 are calculated according to the strength; wherein T is the torque obtained in step S3, and ζ is the material coefficient of the plate.

[0057] S5, according to the formula The button torque calculates the diameters of the first upper roller 11, the first lower roller 12, the second upper roller 21 and the second lower roller 22; wherein T is the torque obtained in step S3, and L is the length of the first upper roller 11 or the first lower roller 12 or the second upper roller 21 or the second lower roller 22.

[0058] S6, multiply d1 and d2 by the safety factor 1.2, and compare the values ​​obtained by the two. The larger value is temporarily determined as the diameter of the first upper roller 11, the first lower roller 12, and the diameter of the cylindrical section in the second upper roller 21 and the second lower roller 22.

[0059] S7, according to the radius of the standard part formed by rolling*0.8, the maximum value of the first upper roller 11 and the second upper roller 21 is obtained, and the value is compared with the provisional diameter in step S6; if the provisional diameter is not greater than the maximum value of the first upper roller 11 and the second upper roller 21, the provisional diameter is used as the final diameter of the first upper roller 11 and the first lower roller 12; otherwise, return to step S2 to reset the roller radius R1.

[0060] Since the radius of the first roller group 1 and the second roller group 2 will affect the radius of the formed sheet during the rolling process, it is necessary to select a suitable roller radius. The radii of the first upper roller 11, the first lower roller 12, the second upper roller 21 and the second lower roller 22 calculated by the above formula in the present invention are more in line with the requirements of sheet rolling. If the roller radius R1 is arbitrarily determined without the above calculation process, the sheet formed by one rolling may have a larger or smaller profile deviation under the action of stress, increasing the number and difficulty of subsequent rolling. Each time the sheet is rolled, the number of internal stress changes and the amount of deformation will increase, the sheet will experience stress fission, or defects will exist inside the sheet, affecting the normal use of the formed sheet and reducing the precision and safety of the CT machine.

[0061] S8, the plate is placed on the first roller assembly, and the adjusting handle 13 drives the first upper roller 11 to descend until it contacts the plate.

[0062] S9, starting the driving motor on the first lower roller 12 to drive the first lower roller 12 and the first upper roller 11 to rotate, so as to drive the plate to bend, thereby realizing the initial bending process of the plate;

[0063] S10, determining the springback amount r according to the error value between the height difference of the plate after the first bending forming and the height difference of the plate after the final forming.

[0064] S11, the inclination angle of the circumferential surface of the truncated cone segment 202 in the second roller group 2 is obtained according to the formula Tanα=r / L; wherein Tanα is the inclination angle, r is the rebound amount, and L is the length of the plate in contact with the truncated cone segment.

[0065] S12, the plate after the initial bending process is placed on the second roller assembly 2, and the adjustment handle 13 drives the second upper roller 21 to descend until it contacts the plate.

[0066] S13, starting the driving motor on the second lower roller 22 to drive the second lower roller 22 and the second upper roller 21 to rotate, so as to drive the plate to correct the bending and form a flange ring that meets the standard.

[0067] The radii of the first roller group 1 and the second roller group 2 obtained through the above steps S1 to S7 make the springback amount r of the plate processed once closer to the standard part, and after a second rolling based on the springback amount and the appropriate second roller group 2, the formed plate can be rolled a coil that meets the processing requirements in the least number of times.

[0068] The plate after one bending is affected by factors such as the thickness and material of the plate, so that it will rebound to varying degrees when not under force, so it is very necessary to select a correction roller that matches it to form a standard part after secondary processing. In the present invention, the error value between the height difference of the plate after one bending and the height difference of the plate after final forming is measured, and the inclination angle of the circumferential surface of each roller in the second roller group is obtained according to the error value through the formula in step S7, and the plate is corrected through the circumferential surface of the truncated cone segment 202, so that the corrected plate can meet the requirements of the standard part.

[0069] In addition, in order to make the CT machine barrel flange ring forming tooling more universal, it is preferred that an inflatable shaft for adjusting the end diameter of the truncated cone section 202 of the second upper roller 21 and the two second lower rollers 22 is built into the end away from the cylindrical section 201, and the end diameter of the truncated cone section 202 is adjusted by the inflatable shaft. Furthermore, the end diameter of the truncated cone section 202 can be determined according to the Tanα inclination angle obtained in the step S7 and the distance between the inflatable shaft and the concave-convex structure 121; and then the amount of inflation and deflation of the inflatable shaft in the truncated cone section 202 is determined. The inclination angle of the circumferential surface of the truncated cone section 202 is changed by the inflatable shaft to correct the contour of the plate bent by the first roller group; and it is adaptive to the correction needs of plates of different thicknesses or materials.

[0070] In order to meet the correction requirements of plates of different thicknesses and materials, each roller in the second roller group 2 can also be designed to be cylindrical. During correction, a frustum of a size that meets the correction requirements is mounted on one end of the roller, so that one end of the second upper roller 21 and the second lower roller 22 in the second roller group 2 is frustum-shaped and the other end is cylindrical, and the two are transitioned by the concave-convex structure 121.

[0071] There are many implementation methods of the present invention, and all technical solutions formed by equivalent transformation or equivalent transformation fall within the protection scope of the present invention.

Claims

1. CT machine barrel flange ring forming tooling, characterized by: The invention comprises a first roller group (1) or a second roller group (2) respectively arranged on two adjustment handle seats (100); the first roller group (1) comprises a cylindrical first upper roller (11) and two first lower rollers (12) arranged in parallel and coplanar; the first upper roller (11) is centered between the two first lower rollers (12), and the circumferential surfaces of the two rollers are provided with mutually matching concave-convex structures (121); the first upper roller (11) is driven by an adjustment handle (13) to move up and down to adapt to plates of different thicknesses; the second roller group (2) comprises a second An upper roller (21) and two second lower rollers (22) arranged in parallel and coplanar manner; the second upper roller (21) is driven by the adjustment handle (13) to move up and down; the second upper roller (21) is centered between the two second lower rollers (22); a cylindrical section (201) and a truncated cone section (202) are correspondingly formed on the second upper roller (21) and the second lower roller (22), and the outer surfaces of the truncated cone sections (202) of the two are complementary; the concave-convex structure (121) is located at the connection between the cylindrical section (201) and the truncated cone section (202).

2. The CT machine barrel flange ring forming tool according to claim 1, characterized in that: The adjusting handle (13) and the adjusting handle (13) are arranged at the top end of the adjusting handle seat (100) and penetrate the adjusting handle seat (100); the adjusting handle (13) and the output ends of the adjusting handle (13) are respectively fixedly connected to the ends of the first upper roller (11) and the second upper roller (21) to drive the first upper roller (11) or the second upper roller (21) to move relative to the first lower roller (12) or the second lower roller (22).

3. The CT machine barrel flange ring forming tool according to claim 2, characterized in that: There are two adjusting handles (13) and two adjusting handles (13), which are respectively arranged at the two ends of the first upper roller (11) and the second upper roller (21) to control the first upper roller (11) or the second upper roller (21) to rise and fall in parallel as a whole.

4. The CT machine barrel flange ring forming tool according to claim 3, characterized in that: Both ends of the first lower roller (12) and the second lower roller (22) are fixed on the adjustment handle seat (100); the ends of the first upper roller (11) and the second upper roller (21) are connected to the output end of the driving motor (122), and are driven to rotate by the driving motor (122).

5. The CT machine barrel flange ring forming tool according to claim 4, characterized in that: The two first lower rollers (12) and the two second lower rollers (22) are arranged at intervals.

6. The CT machine barrel flange ring forming tool according to claim 1, characterized in that: The bending angle R in the concave-convex structure (121) is not less than the thickness of the plate.

7. A method for forming a flange ring of a CT machine barrel, using the CT machine barrel flange ring forming tool as claimed in any one of claims 1 to 6, characterized in that: The steps include: S1, according to the formula The bending moments of the first upper roller (11), the first lower roller (12), the second upper roller (21) and the second lower roller (22) are obtained; wherein M is the bending moment, K1 is the cross-sectional shape coefficient, K0 is the relative strengthening coefficient, t is the thickness of the plate, R1 is the relative curvature radius, W is the cross-sectional modulus, and σs is the tensile strength; S2, according to the formula The forces acting on the first upper roller (11) and the second upper roller (21) are calculated; according to the formula The forces on the first lower roller (12) and the second lower roller (22) are calculated; wherein M is the bending moment obtained in step S1, R1 is the preset radius of the first upper roller (11) and the second upper roller (21), or the first lower roller (12) and the second lower roller (22), and t is the thickness of the plate; S3, calculating the torque of the first upper roller (11) and the second upper roller (21) according to the formula T=Fa2*R1; calculating the torque of the first lower roller (12) and the second lower roller (22) according to the formula T=Fc2*R1; S4, according to the formula The diameters of the first upper roller (11), the first lower roller (12), the second upper roller (21) and the second lower roller (22) are obtained by strength calculation; wherein T is the torque obtained in step S3, and ζ is the material coefficient of the plate; S5, according to the formula The button moment calculates the diameters of the first upper roller (11), the first lower roller (12), the second upper roller (21) and the second lower roller (22); wherein T is the torque obtained in step S3, and L is the length of the first upper roller (11) or the first lower roller (12) or the second upper roller (21) or the second lower roller (22); S6, comparing the values ​​of d1 and d2, and tentatively setting the larger value as the diameter of the first upper roller (11), the first lower roller (12), and the diameter of the cylindrical section in the second upper roller (21) and the second lower roller (22); S7, according to the radius of the standard part formed by rolling*0.8, the maximum value of the first upper roller (11) and the second upper roller (21) is obtained, and the value is compared with the diameter temporarily determined in step S6; if the temporarily determined diameter is not greater than the maximum value of the first upper roller (11) and the second upper roller (21), the temporarily determined diameter is used as the final diameter of the first upper roller (11) and the first lower roller (12); otherwise, return to step S2 to reset the roller radius R1; S8, a plate is placed on the first roller assembly (1), and the adjustment handle (13) drives the first upper roller (11) to descend until it contacts the plate; S9, starting the driving motor on the first lower roller (12) to drive the first lower roller (12) and the first upper roller (11) to rotate, so as to drive the plate to bend, thereby realizing the initial bending process of the plate; S10, determining the springback amount r according to the error value between the height difference of the plate after the first bending forming and the height difference of the plate after the final forming; S11, according to the formula tanα=r / L, the inclination angle of the circumferential surface of the truncated cone segment (202) in the second roller assembly (2) is obtained; wherein tanα is the inclination angle, r is the rebound amount, and L is the length of the plate in contact with the truncated cone segment tanα; S12, the plate after the initial bending process is placed on the second roller assembly (2), and the adjustment handle (13) drives the second upper roller (21) to descend until it contacts the plate; S13, starting the driving motor on the second lower roller (22) to drive the second lower roller (22) and the second upper roller (21) to rotate, so as to drive the plate to correct the bending and form a flange ring that meets the standards.

8. The method for forming a flange ring of a CT machine barrel according to claim 7, characterized in that: The relative curvature radius R1 in step S1 is R / t, where R is the bending radius of the plate; the section modulus W of the cross section is Bt 2 / 6, where B is the width of the plate.

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