A closing spinning device and forming method for thin-walled rotating body components

Abstract

The present invention belongs to the field of forming of rotating body components, and specifically relates to a closing spinning device and a forming method for thin-walled rotating body components. The closing spinning device comprises a rotating table, a clamping assembly fixedly arranged on the rotating table, and at least one spinning assembly. The spinning assembly can control the thickness and surface quality of a cylindrical workpiece, which is convenient for controlling the thickness of the product, and can make the thickness of the product more easily meet the design requirements. It can produce thin-walled rotating body components with relatively uniform thickness, and also thin-walled rotating body components with gradually varying thickness. The forming method can propose to carry out closing spinning on a cylindrical workpiece with a diameter-to-thickness ratio greater than 200:1. The closing spinning process is divided into three stages. Different closing trajectory routes and differentiated processing techniques need to be selected in different closing stages, so as to ensure the shape accuracy and surface quality of the closing spinning. The use of overall spinning forming can effectively improve the efficiency of box bottom forming.

Description

Technical Field

[0001] The invention belongs to the field of forming of rotating body components, and in particular relates to a closing spinning device and a forming method for a thin-walled rotating body component. Background Art

[0002] With the continuous improvement of modern manufacturing technology, the demand for the forming performance, forming accuracy and lightweight of rotating components is increasing day by day. The application fields of rotating components are also very wide, such as aerospace, daily necessities and energy containers, automobile manufacturing, etc. The engine lip skin in aerospace parts, the bottom head of the launch vehicle fuel tank, the exhaust pipe in the automobile manufacturing field, the pressure vessel tank in the energy field and various lamps in daily life are all types of thin-walled rotating components. The difficulties in forming thin-walled rotating components are mainly concentrated in the field of aerospace manufacturing.

[0003] In the field of aerospace manufacturing, the bottom of the fuel tank of a launch vehicle is an ellipsoidal shell, which is a standard curved generatrix body of revolution component. At present, the main spinning forming method for such components is center-constrained spinning.

[0004] The sheet metal spinning in center-constrained spinning is limited by the maximum sheet metal size. As the diameter of the sheet metal increases, the moment of inertia of the workpiece increases, and the processing area is farther away from the clamping end, the stiffness gradually decreases, and the difficulty of spinning increases exponentially, which is not conducive to the spinning of large components. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a closing spinning device and a forming method for thin-walled rotating body components, thereby improving the spinning forming quality of large thin-walled rotating body components.

[0006] The present invention provides a closing spinning device for a thin-walled rotating body component, comprising:

[0007] Turntable;

[0008] A clamping assembly fixedly arranged on the rotating table is used to fix the cylindrical workpiece, and a rotating core mold is installed on the clamping assembly, and the bottom edge of the rotating core mold is in contact with the inner side of the cylindrical workpiece;

[0009] At least one spinning assembly, the spinning assembly includes a mechanical tooling and a spinning wheel arranged on the mechanical tooling, the mechanical tooling moves with the spinning wheel in a three-dimensional coordinate system or a two-dimensional coordinate system, and is used to spin the cylindrical workpiece to attach it to the rotating body core mold.

[0010] Optionally, the clamping assembly includes a core mold mounting seat and a pressure ring, the outer side of the core mold mounting seat has a supporting convex ring, the bottom of the cylindrical workpiece has an outer bending edge, the pressure ring is connected to the rotating table by bolts, and the pressure ring and the supporting convex ring clamp the outer bending edge of the cylindrical workpiece.

[0011] Optionally, the top outer edge of the supporting protrusion ring has a chamfer, the inner side surface of the pressing ring close to the supporting protrusion ring is a bending surface, and the bending transition of the bending surface is an arc surface or a slope, and the bending transition of the bending surface is an interference fit with the chamfer.

[0012] Optionally, a groove is provided at the center of the rotating table, and the core mold mounting seat is embedded in the groove.

[0013] Optionally, the rotating body core mold is divided into a bottom area, a middle area and a top area from bottom to top, the angle between the top section of the bottom area and the vertical plane is 40°~50°, and the angle between the top section of the middle area and the vertical plane is 55°~70°.

[0014] Optionally, two spinning components are symmetrically arranged on both sides of the rotating body core mold.

[0015] The beneficial effect of the present invention is that when in use, the rotating table drives the rotary core mold and the cylindrical workpiece to rotate together, and the mechanical tooling carries the extrusion wheel to continuously extrude the surface of the cylindrical workpiece from a position close to the bottom side of the rotary core mold, gradually causing the cylindrical workpiece to creep and fully adhere to the rotary core mold to form a closed-end thin-walled rotary component; the rotary core mold has a relatively stable supporting and limiting effect on the cylindrical workpiece from the inside, which can ensure the accuracy of the inner side of the formed product; the spinning assembly can control the thickness and surface quality of the cylindrical workpiece, which is convenient for controlling the thickness of the product, and can make the thickness of the product more easily meet the design requirements, and can produce thin-walled rotary components with relatively uniform thickness, as well as thin-walled rotary components with gradually changing thickness.

[0016] The present invention provides a forming method of a thin-walled rotating body component, using the closing spinning device, comprising the following steps:

[0017] The first stage of spinning: Direct die-attaching spinning is adopted, and the angle between the section at the generatrix of the workpiece and the vertical plane varies from 0 to θ 1 ,θ 1 The range is 40°~50°;

[0018] The second stage of spinning: the progressive die-attaching spinning is adopted. The workpiece is first spun to keep a certain distance between the workpiece and the rotating core die, and then the die-attaching spinning is performed. The angle between the section at the generatrix of the workpiece and the vertical plane varies in the range of θ 1 ~θ 2 ,θ 2 The range is 55°~70°;

[0019] The third stage of spinning: first use the spinning trajectory of dieless spinning to complete or partially close the mouth, and then perform local die-attached spinning until the workpiece is completely attached to the rotating core mold. The angle between the section at the generatrix of the workpiece and the vertical plane varies in the range of θ 2 ~90°.

[0020] Optionally, the closing amount of the first stage spinning is 18% to 20%, and the closing amount of the second stage spinning is 50% to 56%.

[0021] Optionally, the spinning component rotates around the workpiece once for a single pass, and the closing amount of the single pass is 3-5 mm, and the rotation speed is 40-60 rpm.

[0022] Optionally, the preheating temperature of the rotating core mold and the workpiece is 220~300℃.

[0023] The beneficial effect of the present invention is that it can propose to carry out closing spinning for cylindrical workpieces with a diameter-to-thickness ratio greater than 200:1. The closing spinning process is divided into three stages. Different closing trajectory routes and differentiated processing techniques need to be selected in different closing stages to ensure the shape accuracy and surface quality of the closing spinning. The use of overall spinning can effectively improve the efficiency of box bottom forming and reduce manufacturing costs. Compared with fluid stamping forming, a larger size of the tank bottom can be formed. Compared with sheet metal spinning into body forming, the closing spinning uses a rolled cylindrical shell, which is not easily restricted by the size of the cylindrical workpiece. As the diameter of the area to be deformed gradually decreases during the spinning process, it is more conducive to the stability of the spinning process. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the closing spinning device of the present invention;

[0025] Figure 2 It is a schematic diagram of the spinning trajectory of the forming method of the thin-walled rotating body component of the present invention;

[0026] Figure 3 This is a physical picture of the product obtained in Example 1;

[0027] Figure 4 This is a simulation diagram of the workpiece of Example 1;

[0028] Figure 5 It is a simulation diagram of the workpiece of comparative examples 1-6.

[0029] In the figure: 1-1, cylindrical workpiece; 100, rotating table; 110, rotating base; 120, positioning base; 130, positioning ring; 200, clamping assembly; 210, core mold mounting seat; 211, supporting convex ring; 212, chamfer; 220, pressing ring; 221, bending surface; 230, chuck; 300, rotating core mold; 310, bottom area; 320, middle area; 330, top area; 340, rotating surface; 350, plane; 360, through hole; 400, spinning assembly; 410, mechanical tooling; 420, spinning wheel. DETAILED DESCRIPTION

[0030] like Figure 1 As shown, the present invention provides a closing spinning device for a thin-walled rotating body component, comprising: a rotating table 100, a clamping assembly 200 fixedly arranged on the rotating table 100, and at least one spinning assembly 400; wherein, the rotating table 100 is used to fix the cylindrical workpiece 1-1, and a rotating body core mold 300 is installed on the clamping assembly 200, and the bottom edge of the rotating body core mold 300 is in contact with the inner side of the cylindrical workpiece 1-1; at least one spinning assembly 400, the spinning assembly 400 includes a mechanical tooling 410 and a spinning wheel 420 arranged on the mechanical tooling 410, the mechanical tooling 410 moves with the spinning wheel 420 in a three-dimensional coordinate system or a two-dimensional coordinate system, and the spinning assembly 400 is used to spin the cylindrical workpiece 1-1 to attach it to the rotating body core mold 300.

[0031] Compared with the prior art, the closing spinning device provided by the present invention, when in use, the rotating table 100 drives the rotating core mold 300 and the cylindrical workpiece 1-1 to rotate together, and the mechanical tooling 410 carries the extrusion wheel 420 to continuously extrude the surface of the cylindrical workpiece 1-1 from a position close to the bottom side of the rotating core mold 300, gradually causing the cylindrical workpiece 1-1 to creep and fully adhere to the rotating core mold 300, forming a closing type thin-walled rotating component; the rotating core mold 300 has a relatively stable supporting and limiting effect on the cylindrical workpiece 1-1 from the inside, which can ensure the accuracy of the inner surface of the formed product; the spinning assembly 400 can control the thickness and surface quality of the cylindrical workpiece 1-1, facilitate the control of the thickness of the product, and make the thickness of the product more easily meet the design requirements, and can produce thin-walled rotating components with relatively uniform thickness, as well as thin-walled rotating components with gradually changing thickness.

[0032] In one embodiment, the clamping assembly 200 includes a core mold mounting seat 210 and a pressure ring 220. The outer side of the core mold mounting seat 210 has a supporting protrusion 211. The bottom of the cylindrical workpiece 1-1 has an outer bending edge. The pressure ring 220 is connected to the rotating table 100 by bolts. The pressure ring 220 and the supporting protrusion 211 clamp the outer bending edge of the cylindrical workpiece 1-1. It can be understood that the core mold mounting seat 210 and the supporting protruding ring 211 are integrally formed, and the supporting protruding ring 211 is in contact with the bottom of the outer bending edge of the cylindrical workpiece 1-1. The supporting protruding ring 211 supports the cylindrical workpiece 1-1 from the bottom, and the pressing ring 220 is attached to the top surface of the outer bending edge. In the process of tightening the pressing ring 220 with bolts, the cylindrical workpiece 1-1 is gradually pressed. The bolts are loosened and the pressing ring 220 is removed to remove the processed product. The convenience of loading and unloading is high, and the cylindrical workpiece 1-1 does not need to have a high precision to ensure that it is fastened to the coaxial position of the rotary core mold 300. In addition, the pressing ring 220 does not need to cooperate with the side of the core mold mounting seat 210 to press the cylindrical workpiece 1-1, so the pressing ring 220 can be adapted to core mold mounting seats 210 of different specifications, so that thin-walled rotary components of different sizes can be processed.

[0033] In one embodiment, the top outer edge of the supporting protruding ring 211 has a chamfer 212, the inner side surface of the press ring 220 close to the supporting protruding ring 211 is a bent surface 221, and the bending transition of the bent surface 221 is an arc surface or an inclined surface, and the bending transition of the bent surface 221 is interference fit with the chamfer 212. It can be understood that after the press ring 220 is fastened to the rotating table 100, the bent surface 221 of the press ring 220 abuts against the top outer edge of the supporting protruding ring 211, and there are two components of force in the axial direction and the radial direction on the contact surface between the bent surface 221 and the chamfer 212, so that the core mold mounting seat 210 is centered and positioned, and the rotating body core mold 300 fixed with the core mold mounting seat 210 is also centered and positioned, ensuring that the axis of the rotating body core mold 300 is highly coincident with the axis of the rotating table 100 when rotating, which is conducive to improving the surface accuracy of the thin-walled rotating body component.

[0034] It should be noted that the core mold mounting seat 210 and the rotating core mold 300 are split structures, so the core mold mounting seat 210 can be adapted to the rotating core molds 300 of different specifications. The core mold mounting seat 210 and the rotating core mold 300 are pre-fixed together by bolts and then installed on the rotating table 100. Of course, in some embodiments, the core mold mounting seat 210 and the rotating core mold 300 can also be formed in one piece.

[0035] In one embodiment, a groove is provided at the center of the rotating platform 100, and the core mold mounting seat 210 is embedded in the groove. It can be understood that the groove plays a positioning role for the core mold mounting seat 210.

[0036] Furthermore, in order to reduce the weight of the core mold mounting seat 210 and make installation and disassembly more labor-saving, the bottom of the core mold mounting seat 210 is provided with a clamping plate 230, and the clamping plate 230 is completely placed in the groove. The clamping plate 230 is positioned and matched with the rotating table 100, that is, the core mold mounting seat 210 is positioned and matched with the rotating table 100. In this way, the height of the core mold mounting seat 210 can be designed to be smaller, thereby reducing the weight of a single component and facilitating movement.

[0037] In one embodiment, the rotary core mold 300 is divided into a bottom area 310, a middle area 320 and a top area 330 from bottom to top. The angle between the top section of the bottom area 310 and the vertical plane is 40° to 50°, which is equivalent to the position where the closing angle of the cylindrical workpiece 1-1 changes to 40° to 50°. Figure 1 The dotted line below is the boundary between the bottom area 310 and the middle area 320. Laser marking can be performed here to facilitate the judgment of whether the spinning is in place during the spinning process. The angle between the top section of the middle area 320 and the vertical plane is 55°~70°, which is equivalent to the position where the closing angle of the cylindrical workpiece 1-1 changes to 55°~70°. Figure 1 The dotted line above is the boundary between the middle area 320 and the top area 330. Laser marking can also be performed here to facilitate the judgment of whether the spinning is in place during the spinning process. In this way, the cylindrical workpiece 1-1 can be processed in three stages, and different processing parameters can be clearly adjusted, which is conducive to improving the surface quality of the product. Preferably, the angle between the top section of the bottom area 310 and the vertical plane is 45°, and the angle between the top section of the middle area 320 and the vertical plane is 60°.

[0038] In one embodiment, two spinning assemblies 400 are symmetrically arranged on both sides of the rotating body core mold 300. This can improve the force balance of the cylindrical workpiece 1-1 and reduce the degree of excessive deformation of the cylindrical workpiece 1-1 to one side, so that the circumferential wall thickness and surface quality of the product are more uniform at the same height.

[0039] In one embodiment, the outer surface of the rotating body mandrel 300 includes a rotating curved surface 340 and a plane 350 located at the top of the rotating curved surface 340. The plane 350 serves as the top of the rotating body mandrel 300. The plane 350 is not used for forming a thin-walled rotating body component. The longitudinal section of the rotating curved surface 340 is a circular arc, an elliptical arc, or a parabola. Preferably, the plane 350 is tangent to the rotating curved surface 340.

[0040] In one embodiment, a through hole 360 ​​is opened on the top of the rotating core mold 300 to balance the internal and external air pressures of the rotating core mold 300 and prevent the rotating core mold 300 from being deformed due to thermal expansion and contraction during the preheating process.

[0041] In one embodiment, the mechanical tooling 410 is a two-dimensional robot or a three-dimensional robot, which can control the extrusion wheel 420 to move in a two-dimensional or three-dimensional coordinate system.

[0042] In one embodiment, the rotating table 100 includes a rotating base 110, a positioning base 120 and a positioning ring 130, and the three are coaxially fixed. Specifically, the rotating base 110 is a rotating power device, the core mold mounting seat 210 is positioned at the top of the positioning base 120, and the pressure ring 220 is fixed to the top of the positioning ring 130 by bolts.

[0043] The present invention provides a method for forming a thin-walled rotating body component, comprising the following steps:

[0044] The first stage of spinning: Direct die-attaching spinning is adopted, and the angle between the section at the generatrix of the workpiece and the vertical plane varies from 0 to θ 1 ,θ 1 The range is 40°~50°; in the first stage, the material in the generatrix direction is mainly stretched along the axial direction, with a small amount of radial contraction, and the workpiece height will be appropriately extended in the axial direction. This type of spinning process is similar to the shear spinning of sheet metal. Although the diameter size is larger at this stage, it is closer to the fixed clamping section and can still have good anti-instability ability. It only needs to ensure that the maximum speed does not exceed the critical value, and the feed rate and single-pass closing amount can be appropriately increased;

[0045] The second stage of spinning: the progressive die-attaching spinning is adopted. The workpiece is first closed by spinning to keep a certain distance between the workpiece and the rotating core die 300, and then the die-attaching spinning is performed. The angle between the section at the generatrix of the workpiece and the vertical plane varies within the range of θ 1 ~θ 2 ,θ 2 The range is 55°~70°; in the second stage, the material in the generatrix direction mainly shrinks along the radial direction, and the stretching in the axial direction is small. In this stage, the single-pass closing amount and feed rate must be reduced, and the workpiece speed can be appropriately increased to ensure that the outer contour line speed is consistent with the first stage (if the single-pass closing amount is too large, serious surface scratches will inevitably appear in this stage until the tensile fracture);

[0046] The third stage of spinning: firstly, the spinning trajectory of dieless spinning is used to complete or partially close the opening, and then local die-attached spinning is performed until the workpiece is completely attached to the rotating core mold 300. The angle between the section at the generatrix of the workpiece and the vertical plane varies within the range of θ 2 ~90°; in the third stage, there is almost no stretching process in the axial direction, and there will be obvious radial shrinkage. The wall thickness increases sharply, and the diameter of the spinning processing position decreases rapidly. The line speed is not constant, and the rotation speed needs to be increased to maintain the single-pass closing amount while reducing the feed rate. Because the spinning processing area is far away from the clamping section and adopts a moldless spinning method, engine oil needs to be applied on the surface to reduce the influence of friction on end face wrinkling.

[0047] It should be noted that the vertical plane is parallel to the axis of the workpiece, and the workpiece represents a cylindrical workpiece 1 - 1 in the spinning process.

[0048] In one embodiment, the closing amount of the first stage spinning is 18%-20%, and the closing amount of the second stage spinning is 50%-56%; within this parameter range, the closing efficiency and the workpiece surface quality can be guaranteed.

[0049] In one embodiment, the spinning component 400 rotates around the workpiece once in a single pass, and the closing amount of a single pass is 3-5 mm, and the rotation speed is 40-60 rpm. In this way, it can be ensured that the workpiece is not prone to notches, abnormal surface scratches or end face folding, and has higher processing efficiency.

[0050] In one embodiment, the preheating temperature of the rotary core mold 300 and the workpiece is 220-300°C.

[0051] Example 1

[0052] like Figure 2 As shown in the figure, taking the ellipsoid (long semi-axis is 202mm and short semi-axis is 130mm) closing spinning of the cylindrical workpiece 1-1 with a diameter of 404mm and a wall thickness of 2mm as an example, the diameter-to-thickness ratio of the cylindrical workpiece 1-1 is 200:1, and the dividing point of the three stages of the closing spinning process is the closing angle θ. 1 is 45° and θ 2 The position is 60°, the closing diameter range of the first stage is 320mm-404mm, the closing diameter range of the second stage is 320mm-220mm, and the closing diameter range of the third stage is 220mm-140mm. The closing spinning trajectory first adopts direct die-attaching spinning, the middle section adopts progressive die-attaching spinning, and the latter section adopts a moldless closing spinning style.

[0053] Process parameters: In the first stage of spinning, the closing amount of a single pass is 5mm, the rotation speed is 40rpm, and the feed rate f=10mm / revolution; in the second stage of spinning, the closing amount of a single pass is 3mm, the rotation speed is 50rpm, and the feed rate f=5mm / revolution; in the third stage of spinning, the closing amount of a single pass is 3mm, the rotation speed is 60rpm, and the feed rate f=10mm / revolution; the obtained product is as follows Figure 3 As shown, the simulation is as follows Figure 4 As shown, the shape is complete, the surface is uniform and smooth, and there are no gaps or end folds.

[0054] Comparative Example 1

[0055] Taking the ellipsoid (long semi-axis is 202mm and short semi-axis is 130mm) of the shell with a diameter of 404mm and a wall thickness of 2mm as an example, the three-stage dividing point of the closing spinning process is the closing angle of θ.1 is 36° and θ 2 The position is 60°, and the closing spinning trajectory first adopts direct die-attaching spinning, the middle section only uses progressive die-attaching spinning, and the latter section uses a moldless closing spinning style.

[0056] Process parameters: Same as Example 1, simulation as Figure 5 As shown in (a), the end face of the workpiece is obviously unstable and wrinkled due to the spinning process.

[0057] Comparative Example 2

[0058] Taking the ellipsoid (long semi-axis is 202mm and short semi-axis is 130mm) of a cylindrical shell with a diameter of 402mm and a wall thickness of 2mm as an example, the three-stage dividing point of the closing spinning process is the closing angle of θ. 1 is 45° and θ 2 The position is 50°, and the closing spinning trajectory first adopts direct die-attaching spinning, the middle section only uses progressive die-attaching spinning, and the latter section uses a moldless closing spinning style.

[0059] Process parameters: Same as Example 1, simulation as Figure 5 As shown in (b), the end face of the workpiece is severely wrinkled and deformed.

[0060] Comparative Example 3

[0061] Taking the ellipsoid (long semi-axis is 202mm and short semi-axis is 130mm) of the shell with a diameter of 404mm and a wall thickness of 2mm as an example, the three-stage dividing point of the closing spinning process is the closing angle of θ. 1 is 55° and θ 2 The position is 60°, and the closing spinning trajectory first adopts direct die-attaching spinning, the middle section only uses progressive die-attaching spinning, and the latter section uses a moldless closing spinning style.

[0062] Process parameters: Same as Example 1, simulation as Figure 5 As shown in (c), a notch appears on the end face of the workpiece.

[0063] Comparative Example 4

[0064] Taking the ellipsoid (long semi-axis is 202mm and short semi-axis is 130mm) of the shell with a diameter of 404mm and a wall thickness of 2mm as an example, the three-stage dividing point of the closing spinning process is the closing angle of θ. 1 is 45° and θ 2 The position is 75°, and the closing spinning trajectory first adopts direct die-attaching spinning, the middle section only uses progressive die-attaching spinning, and the latter section uses a moldless closing spinning style.

[0065] Process parameters: Same as Example 1, simulation as Figure 5As shown in (d), the workpiece is cut off in the spinning area.

[0066] Comparative Example 5

[0067] Only the process parameters are adjusted, and the rest are the same as in Example 1. The process parameters are as follows: in the first stage of spinning, the closing amount of a single pass is 5 mm, the rotation speed is 65 rpm, and the feed rate f = 10 mm / revolution; in the second stage of spinning, the closing amount of a single pass is 3 mm, the rotation speed is 50 rpm, and the feed rate f = 5 mm / revolution; in the third stage of spinning, the closing amount of a single pass is 3 mm, the rotation speed is 60 rpm, and the feed rate f = 10 mm / revolution; the simulation is as follows Figure 5 As shown in (e), the end surface of the workpiece is wrinkled after spinning.

[0068] Comparative Example 6

[0069] Only the process parameters are adjusted, and the rest are the same as in Example 1. The process parameters are as follows: in the first stage of spinning, the closing amount of a single pass is 5 mm, the rotation speed is 40 rpm, and the feed rate f = 10 mm / revolution; in the second stage of spinning, the closing amount of a single pass is 3 mm, the rotation speed is 50 rpm, and the feed rate f = 5 mm / revolution; in the third stage of spinning, the closing amount of a single pass is 3 mm, the rotation speed is 65 rpm, and the feed rate f = 10 mm / revolution; the simulation is as follows Figure 5 As shown in (f), cracks appear on the end surface of the workpiece.

[0070] A person skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of protection of the present application is limited to these examples. In line with the concept of the present application, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of different aspects of one or more embodiments of the present application as described above, which are not provided in detail for the sake of simplicity.

[0071] One or more embodiments of the present application are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the present application. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of one or more embodiments of the present application should be included in the protection scope of the present application.

Claims

1. A method for forming a thin-walled rotating body component, characterized in that: The workpiece is a cylindrical workpiece (1-1), comprising the following steps: The first stage of spinning: direct die-attaching spinning is adopted, and the angle between the section at the generatrix of the workpiece and the vertical plane varies from 0 to θ1, and the range of θ1 is 40° to 50°; The second stage of spinning: using progressive die-attaching spinning, firstly closing the mouth to keep a certain distance between the workpiece and the rotating body core mold (300), and then die-attaching spinning, the angle between the section at the generatrix of the workpiece and the vertical plane varies in the range of θ1~θ2, and the range of θ2 is 55°~70°; The third stage of spinning: firstly, the spinning trajectory of dieless spinning is used to completely or partially close the workpiece, and then local die-attached spinning is performed until the workpiece is completely attached to the rotating core mold (300), and the angle between the section at the generatrix of the workpiece and the vertical plane varies in the range of θ2~90°.

2. The forming method according to claim 1, characterized in that: The closing amount of the first stage spinning is 18%~20%, and the closing amount of the second stage spinning is 50%~56%.

3. The forming method according to claim 1, characterized in that: The spinning component (400) rotates around the workpiece once for a single pass, and the closing amount of the single pass is 3-5 mm, and the rotation speed is 40-60 rpm.

4. The forming method according to any one of claims 1 to 3, characterized in that: The preheating temperature of the rotating core mold (300) and the workpiece is 220-300°C.

5. A closing spinning device for thin-walled rotating body components, characterized in that: Used to perform the forming method according to any one of claims 1 to 4, the closing spinning device comprises: Rotating table (100); A clamping assembly (200) fixedly arranged on the rotating table (100) and used to fix the cylindrical workpiece (1-1), wherein a rotary core mold (300) is installed on the clamping assembly (200), and the bottom edge of the rotary core mold (300) is in contact with the inner side of the cylindrical workpiece (1-1); At least one spinning assembly (400), the spinning assembly (400) comprising a mechanical tool (410) and a spinning wheel (420) arranged on the mechanical tool (410), the mechanical tool (410) moving with the spinning wheel (420) in a three-dimensional coordinate system or a two-dimensional coordinate system, and being used for spinning a cylindrical workpiece (1-1) to attach to a rotating body core mold (300); The rotating body core mold (300) is divided into a bottom area (310), a middle area (320) and a top area (330) from bottom to top, the angle between the top section of the bottom area (310) and the vertical plane is 40° to 50°, and the angle between the top section of the middle area (320) and the vertical plane is 55° to 70°.

6. The closing spinning device according to claim 5, characterized in that: The clamping assembly (200) comprises a core mold mounting seat (210) and a pressure ring (220); the outer side of the core mold mounting seat (210) is provided with a supporting convex ring (211); the bottom of the cylindrical workpiece (1-1) is provided with an outer bending edge; the pressure ring (220) is connected to the rotating table (100) by bolts; the pressure ring (220) and the supporting convex ring (211) clamp the outer bending edge of the cylindrical workpiece (1-1).

7. The closing spinning device according to claim 6, characterized in that: The top outer edge of the supporting convex ring (211) has a chamfer (212); the inner side surface of the pressing ring (220) close to the supporting convex ring (211) is a bending surface (221); the bending transition of the bending surface (221) is an arc surface or an inclined surface; the bending transition of the bending surface (221) is interference fit with the chamfer (212).

8. The closing spinning device according to claim 6, characterized in that: A groove is provided at the center of the rotating platform (100), and the core mold mounting seat (210) is embedded in the groove.

9. The closing spinning device according to claim 5, characterized in that: The two spinning assemblies (400) are symmetrically arranged on both sides of the rotating body core mold (300).

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