A method for manufacturing a cylinder structure with ribs in a belt based on spinning-additive hybrid manufacturing

Abstract

The application provides a method for manufacturing a cylinder structure with internal ribs based on spinning-additive composite manufacturing, relates to the fields of spinning and additive manufacturing, and particularly relates to dividing the cylinder structure into two parts of spinning forming and additive manufacturing forming, that is, first forming a cylinder structure through spinning, and then forming an internal rib structure in the inner cavity of the cylinder structure through additive manufacturing. The whole manufacturing of a complex aerospace thin-walled component is realized through the new process of flow spinning and additive manufacturing, which is an equal-material-additive composite forming process, and the process not only meets the requirements of the severe mechanical properties of the component, but also takes into account the requirements of the high precision of the rib height and the cylinder segment shape.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of spinning processing and additive manufacturing, and particularly relates to a method for manufacturing a cylinder structure with internal ribs based on spinning-additive composite manufacturing. BACKGROUND

[0002] The ribbed thin-walled cylinder is a cylindrical main body structure of a spacecraft and a missile, and its integrated manufacturing structure is an effective way to improve the lightweight level of large equipment and is a typical complex thin-walled structure. It usually has the characteristics of high ribs and thin abdomen, has a complex geometric shape, and is harsh in precision, performance and weight, and is a difficult-to-machine product. Flow spinning, as a near-net forming process, has the advantages of small load and high process flexibility. The spinning workpiece undergoes strong plastic deformation during the machining process, and has outstanding advantages in mechanical properties. Therefore, the flow spinning process is suitable for the integrated forming of large-diameter thin-walled cylinder structures. Due to the obvious uneven deformation of the material under local strong loading during the spinning forming process, the internal rib is not filled, and other phenomena, which limit the forming height of the reinforcing rib, are particularly prominent for cross-rib cylinder segments. In addition, for each change of rib structure, a corresponding spinning blank mold needs to be manufactured, which is high in cost and long in cycle, and it is difficult to manufacture complex multi-level ribs.

[0003] Direct energy deposition, as a rapid and efficient additive manufacturing method, has become an important choice for rapid manufacturing of complex components due to its high forming efficiency, high material utilization rate, complex structure forming, and short manufacturing cycle.

[0004] Therefore, complex local features that cannot be completed by spinning process can be manufactured by additive manufacturing, the high internal rib shape of the thin-walled cylinder can be set, and the mold-free manufacturing of the high internal rib can be completed, so that the mechanical properties of the complex high internal rib thin-walled cylinder structure are better and the weight is lighter.

[0005] CN114082825A discloses a reverse flow spinning forming device and control method for a cylinder with grid ribs. By appropriately constraining the axial flow of the metal blank, the metal material is promoted to flow into the rib groove, the grid internal rib height is increased, and the formed rib body is no longer subjected to axial tension, thereby avoiding the cracking risk caused by excessive axial tension stress during positive spinning. However, this method only considers the spinning problem from the process point of view, and does not explain the residual stress distribution after spinning forming and how to control it. Moreover, this process has limited improvement in internal rib height, and different molds need to be processed for different internal rib shapes, which is low in efficiency, and the manufacturing process and cycle are not shortened.

[0006] CN201910306894 discloses a preheating strong spinning forming method for preparing a magnesium alloy belt ribbed cylinder part. Through single-pass large thinning rate one-time spinning forming and surface finishing, a high forming quality belt ribbed cylinder part meeting the size requirements can be effectively obtained, and the adverse factors in the multi-pass spinning forming process of the belt ribbed cylinder part are avoided. However, this method is only suitable for simple inner ribs, and there are still many constraints for the manufacture of complex high inner ribs obtained by topology optimization.

[0007] In summary, there is a lack of a universal method combining spinning and additive manufacturing for manufacturing high-rib thin-walled cylindrical structures. The existing partial equipment is relatively bulky, costly and has great limitations. The flow spinning process has good mechanical properties for manufacturing high-rib thin-walled cylindrical structures, but cannot manufacture high-ribs. The additive manufacturing technology has obvious advantages in manufacturing complex high-ribs, so it is necessary to develop a method for manufacturing complex high-rib thin-walled cylindrical structures based on spinning and additive manufacturing. SUMMARY

[0008] The purpose of the present application is to provide a method for manufacturing a belt ribbed cylindrical structure based on spinning and additive manufacturing. The flow spinning and additive manufacturing of this new spinning and additive manufacturing composite forming process realize the overall manufacturing of complex aerospace thin-walled components, which not only meets the requirements of the mechanical properties of such components, but also takes into account the high precision requirements of the rib height and the cylinder shape.

[0009] The technical scheme adopted by the present application to solve its technical problems is: a method for manufacturing a belt ribbed cylindrical structure based on spinning and additive manufacturing, which divides the cylindrical structure into spinning forming and additive forming, that is, first spinning forms a cylinder structure, and then additive forms an inner rib structure in the inner cavity of the cylinder structure.

[0010] Further, based on the thickness of the cylinder of the cylindrical structure, the workpiece is divided into spinning forming and additive forming, x is the thickness threshold of the cylinder of the cylindrical structure, when the thickness h of the cylinder of the cylindrical structure is greater than x, the spinning formed cylinder structure is a cylinder without inner rib, and the additive formed inner rib structure is all inner rib; when the thickness h of the cylinder is less than or equal to x, the spinning formed cylinder structure is a cylinder + short rib, and the additive formed inner rib structure is a high rib, and the short rib + high rib is all inner rib; wherein the height of the short rib Δh is less than h.

[0011] wherein, σ is the maximum radial stress value generated by additive manufacturing of the material of the cylindrical structure; l is half of the axial length of the cylinder; E is the elastic modulus of the material of the cylindrical structure; a is the weld width of additive manufacturing; b is the arc length / width of the cylinder around the weld of the inner rib of the cylindrical structure, and the value range is 6-10 times the weld width; [ω] is the maximum deformation of the cylindrical structure.

[0012] Further, the method for manufacturing a high-ribbed cylindrical structure by spinning-additive composite manufacturing comprises the following steps:

[0013] (1) After modeling the whole data of the workpiece, the data model is divided into a cylinder structure model for spinning forming and an inner rib structure model for additive manufacturing according to the thickness of the cylinder of the cylindrical structure;

[0014] (2) According to the cylinder structure data model, the workpiece blank is spun by the spinning equipment to complete the manufacturing of the cylinder structure;

[0015] (3) The inner rib structure data model is sliced, the forming track is planned, and the additive manufacturing data file is generated;

[0016] (4) The cylinder structure obtained by spinning forming is clamped to the additive manufacturing device, and the additive manufacturing data file obtained in step (3) is imported into the additive manufacturing device actuator;

[0017] (5) The clamped cylinder structure is preheated to a set temperature, and after reaching the set temperature, the inner rib structure is manufactured by additive manufacturing in the inner cavity of the cylinder structure obtained by spinning;

[0018] (6) According to the additive manufacturing data file in step (3), the manufacturing of the cylindrical structure is finally completed.

[0019] Further, in step (1), the additive manufacturing material is a metal that can be directly energy deposited, and the materials used for the cylinder structure formed by spinning and the inner rib structure formed by additive manufacturing belong to the same type of alloy, including but not limited to aluminum alloy, stainless steel, and titanium alloy.

[0020] Further, in step (1), the additive manufacturing is a direct energy deposition process, specifically one of laser deposition manufacturing and electric arc wire additive manufacturing.

[0021] Further, in step (1), the spinning forming is one of preheating strong spinning and one-way multi-pass flow spinning.

[0022] Further, in step (4), before the additive manufacturing starts, the inner surface of the cylinder structure obtained by spinning is polished and cleaned with acetone, and the additive manufacturing raw materials (electric arc additive welding wire material, laser additive powder material) are dried to prepare for subsequent additive manufacturing;

[0023] Further, in step (4), the tool clamp for limiting the thermal deformation of the high-ribbed cylindrical structure is also included, and the tool clamp can limit the thermal deformation of the cylindrical structure during the additive manufacturing process by internal and external restraint clamping.

[0024] Further, the clamping mechanism used for clamping the cylinder structure in the step (4) comprises a three-gripper chuck, a four-gripper chuck, a C-shaped support, and a special tool clamp.

[0025] Further, the preheating device used in the step (5) is one of an induction coil, a track-type ceramic electric heating blanket, a resistance heating rod, and a ring-shaped acetylene welding gun heating device.

[0026] Further, in the step (6), the cylinder structure performs a circumferential motion, and the additive manufacturing execution mechanism performs a translational motion along the cylinder axis.

[0027] Further, the circumferential motion is performed by a positioner, and the additive manufacturing execution mechanism is one of a six-axis robot and a three-coordinate machine tool.

[0028] Further, the step (6) further comprises detecting the workpiece temperature by using a temperature measuring device, and when the upper limit of the temperature threshold value between the additive layers is reached, the heat is dissipated and cooled until the temperature between the layers is cooled to the lower limit of the temperature threshold value.

[0029] Further, the temperature measuring device is one of an infrared temperature measuring instrument, a thermocouple, and a metal contact type temperature measuring instrument.

[0030] Compared with the prior art, the method has the following beneficial effects:

[0031] On the basis of the spinning manufacturing of the cylinder structure, the additive manufacturing of the complex inner rib is performed, on the one hand, the spinning area and the additive area are divided by the wall thickness, which not only ensures the rapid manufacturing of the complex inner rib thin-walled cylinder structure, but also solves the problem of insufficient filling of the spinning manufacturing of the high inner rib, on the other hand, the overall manufacturing of the complex high inner rib wall component is realized through the flow spinning and the additive manufacturing, which not only meets the requirements of the mechanical properties of such components, but also takes into account the requirements of the high precision of the rib height and the cylinder segment shape, and provides a relatively mature case for the equal material-additive composite manufacturing.

[0032] The method of the application firstly manufactures the cylinder structure through spinning forming to increase the stiffness of the original blank, and the tool clamp resisting thermal deformation is installed before the start of the additive manufacturing process, which greatly reduces the deformation problem caused by excessive thermal stress in the additive manufacturing process of the complex inner rib of the thin-walled cylinder structure, and obtains a structure with better mechanical properties, lighter weight and higher precision. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 It is a flow chart of a method for spinning-additive composite manufacturing of a cylinder structure with an inner rib;

[0034] Figure 2 It is a complex inner rib cylinder structure model after topological optimization in Example 1.

[0035] Figure 3 A complex inner ribbed cylindrical structure model optimized by topology for example 2;

[0036] Figure 4 For additive manufacturing device;

[0037] In the figure: 1-heat dissipation fan, 2-clamping mechanism, 3-cylinder, 4-short rib, 5-fixture clamp, 6-heating device, 7-additive manufacturing execution mechanism, 8-additive manufacturing execution mechanism lifting device, 9-axial movement device, 10-temperature probe, 11-C-type support. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and do not limit the present application.

[0039] A method for manufacturing a ribbed cylindrical structure based on spinning-additive composite manufacturing, comprising the following steps:

[0040] 1) After modeling the overall data of the workpiece, the data model is divided into spinning forming and additive manufacturing forming according to the thickness of the cylinder of the cylindrical structure:

[0041] Among them, according to the thickness of the cylinder of the ribbed cylindrical structure (cylinder wall thickness), the workpiece is divided into spinning forming and additive manufacturing forming, x is the thickness threshold of the cylinder of the cylindrical structure, when the thickness of the cylinder of the cylindrical structure h>x, the spinning formed cylinder structure is a cylinder without inner rib, and the additive manufactured inner rib structure is all inner rib, that is, a thicker cylinder without inner rib is directly spun formed, and all complex high inner ribs are manufactured by additive manufacturing; When the thickness of the cylinder h≤x, the spinning formed cylinder structure is cylinder+short rib, and the additive manufactured inner rib structure is high rib, short rib+high rib is all inner rib, and the height of the short rib Δh is less than the thickness of the cylinder h, in order to prevent large deformation caused by additive manufacturing heat input, that is, a thinner cylinder+short rib is first formed by spinning, and then a higher rib structure is further manufactured on the short rib in the inner cavity of the spinning cylinder by additive manufacturing;

[0042] Among them, mm; σ is the maximum radial stress value of the additive manufacturing of the cylindrical structure material, unit MPa; l is half of the axial length of the cylinder (cylinder), unit mm; E is the elastic modulus of the cylindrical structure, unit MPa; a is the welding bead width of the additive manufacturing, unit mm; b is the arc length of the cylinder around the welding bead of the inner rib of the cylindrical structure, unit mm, which is approximated as a rectangle in a small range, and the value range is 6-10 times of the welding bead width; [ω] is the maximum radial deformation of the cylindrical structure design requirement, unit mm; Δh is the height of the short rib, unit mm; h is the thickness of the cylinder, unit mm;

[0043] 2) According to the cylinder structure data model, the workpiece blank is spun by the spinning equipment, and the manufacturing of the cylinder structure is completed;

[0044] 3) The inner rib structure data model is sliced, the forming track is planned, and the additive manufacturing data file is generated;

[0045] 4) The cylinder structure obtained by spinning forming is clamped to the additive manufacturing device, the clamping mechanism used includes three-jaw chuck, four-jaw chuck, C-shaped support, special tool clamp, and tool clamp for limiting the thermal deformation of the high inner rib cylindrical structure, the tool clamp can limit the thermal deformation of the cylindrical structure generated during the additive manufacturing process by internal and external restraint clamping, and the additive manufacturing data file obtained in step 3) is imported into the additive manufacturing device execution mechanism;

[0046] 5) The inner surface of the cylinder structure obtained by spinning is polished and cleaned with acetone, and the additive manufacturing raw materials (arc additive welding wire material, laser additive powder material) are dried, so as to prepare for subsequent additive manufacturing;

[0047] 6) The clamped cylinder structure is preheated to a set temperature, and after reaching the set temperature, the preheating device is one of an induction coil, a track-type ceramic electric heating blanket, a resistance heating rod, and a ring-shaped acetylene welding gun heating device;

[0048] 7) The workpiece temperature is detected by a temperature measuring device, and when the upper limit of the additive layer temperature threshold is reached, the temperature is cooled by heat dissipation until the interlayer temperature is cooled to the lower limit of the temperature threshold; the temperature measuring device is one of an infrared thermometer, a thermocouple, and a metal contact type thermometer;

[0049] 8) The inner rib structure is additive manufactured in the inner cavity of the cylinder structure obtained by spinning by using the additive manufacturing motion execution mechanism;

[0050] 9) According to the additive manufacturing data file, the manufacturing of the cylindrical structure is finally completed.

[0051] In step 1), the additive manufacturing material is a metal that can be directly energy deposited. In principle, the materials used in the spinning process and the additive process should be of the same type of alloy, including but not limited to aluminum alloys, stainless steel, and titanium alloys.

[0052] In step 1), additive manufacturing is a direct energy deposition process, specifically one of laser deposition manufacturing or arc wire additive manufacturing.

[0053] In step 1), the spinning process is one of preheated strong spinning or unidirectional multi-pass flow spinning.

[0054] In step 8) of the additive manufacturing process, the cylindrical structure undergoes circular motion, and the additive manufacturing actuator performs translational motion along the axis of the cylindrical structure.

[0055] The circular motion is performed using a positioner, and the additive manufacturing actuator is either a six-axis robot or a three-coordinate machine tool.

[0056] Example 1:

[0057] like Figure 1 As shown, a method for manufacturing a cylindrical structure with internal ribs based on spin forming-additive composite manufacturing includes the following steps:

[0058] 1) Based on the thickness of the complex high-ribbed cylindrical structure model, the model is divided into two parts: a spin-formed cylindrical structure model and an additively manufactured internal ribbed structure model. Taking aerospace-grade 2219 aluminum alloy as an example, the cylindrical thickness h is 5mm, the maximum radial stress σ generated by additive manufacturing is 150MPa, the workpiece length 2l is 500mm, the elastic modulus E is 67000MPa, a is 10mm, b is 80mm, and the maximum radial deformation [ω] is 10mm. Calculations show that the cylindrical thickness h = 5mm < the thickness threshold x = 54.73mm. Therefore, the spin-formed cylindrical structure includes a thin-walled cylinder (i.e., the cylindrical body) + short ribs; the additively manufactured internal ribbed structure is a complex high-ribbed structure, and the short ribs + complex high ribs constitute all internal ribs.

[0059] Complex high internal ribbed cylindrical structure model, such as Figure 2 As shown, Figure 2 (a) is a thin-walled cylinder (i.e., cylinder body) with short ribs manufactured by spinning; (b) is a complex high-rib structure manufactured by additive manufacturing; (c) is an integral complex high-internal-rib cylindrical structure; and (d) is a side view of (a), (b), and (c).

[0060] 2) with Figure 2 For example, a preheated strong spinning process is used to produce A thin-walled cylinder (i.e., cylinder body) + short ribs, the wall thickness of the thin-walled cylinder (i.e., the thickness of the cylinder body) is 5mm, the height of the short ribs is 4.5mm, and the width is 20mm;

[0061] 3) The inner rib structure model is sliced and layered by 3dAM-Planner2023 slicing software, and the corresponding forming trajectory is divided, and the program code is imported into the KUKA six-axis robot;

[0062] 4) As shown in Figure 4 , the four-jaw chuck using the inner rib structure additive manufacturing device uses the outer clamping method to clamp the cylinder structure (thin-walled cylinder + short rib) with spinning forming, and an annular clamp is clamped outside the workpiece to limit thermal deformation;

[0063] 5) Polish the inner surface of the rib, and after removing the oxidation layer, clean it with acetone, and dry the 1.2mm diameter 2319 supply wire;

[0064] 6) As shown in Figure 4 , a tracked ceramic electric heating blanket is used, and an infrared temperature measuring instrument is used to measure the temperature, and the workpiece is preheated to 150℃;

[0065] 7) Use an infrared temperature measuring device to measure the temperature, control the interlayer temperature between 80℃-100℃, and start the closed-loop control of fan 1;

[0066] 8) As shown in Figure 4 , the printing head uses an electric arc heat source to melt and weld the 2319 supply wire in the feeding system, form a molten pool under the action of protective gas, and form a deposition layer with a layer height of 2mm by moving the printing head. The corresponding parameters of the robot and the welding machine are: current 160A, voltage 14V, wire feeding speed 8m·min -1 , and the moving speed of the welding gun 11 is 15mm·s -1 .

[0067] 9) Based on the process parameters of step 8), the additive manufacturing of complex high-rib cylinder structure is completed.

[0068] Example 2:

[0069] As shown in Figure 1 , a method for manufacturing a cylinder structure with internal ribs based on spinning and additive manufacturing includes the following steps:

[0070] 1) Based on the thickness of the complex high-ribbed cylindrical structure model, the model is divided into two parts: a spin-formed cylindrical structure model and an additively manufactured internally ribbed structure model. Taking 316L stainless steel as an example, the cylindrical thickness h is 25mm, the maximum radial stress σ generated by additive manufacturing is 180MPa, the workpiece length 2l is 400mm, the elastic modulus E is 200000MPa, a is 10mm, b is 100mm, and the maximum radial deformation [ω] is 15mm. Calculations show that the cylindrical thickness h = 25mm > the thickness threshold x = 24.33mm. Therefore, the spin-formed cylindrical structure is an unribbed cylindrical structure; the additively manufactured internally ribbed structure is a complex high-ribbed structure, which consists of all internal ribs.

[0071] Complex high internal ribbed cylindrical structure model, such as Figure 3 As shown, Figure 3 (a) is a spin-formed unribbed cylinder, (b) is an additively manufactured complex highly ribbed cylinder, (c) is an integral complex highly internally ribbed cylindrical structure, and (d) is a side view of (a), (b), and (c).

[0072] 2) with Figure 3 For example, a unidirectional multi-pass flow spinning process is used to manufacture... The unreinforced cylinder (body) has a thickness of 25mm;

[0073] 3) The internal rib structure model is sliced ​​into layers using LDM-Planner slicing software, and corresponding forming trajectories are defined. The program code is then imported into the LDM-800 laser additive manufacturing system.

[0074] 4) such as Figure 4 As shown, the unribbed spinning cylinder is clamped into the internal ribbed additive manufacturing device using a three-jaw chuck via an internal clamping method, and an annular clamp is clamped on the outside of the workpiece to restrict thermal deformation.

[0075] 5) Grind the inner surface of the cylinder and dry the 316L stainless steel powder with a particle size of 44-149μm;

[0076] 6) such as Figure 4 As shown, an electromagnetic coil is used for induction heating to preheat the workpiece to 240°C;

[0077] 7) Use thermocouples to measure the temperature and control the interlayer temperature between 180℃ and 200℃, then start the closed-loop control of fan 1.

[0078] 8) such as Figure 4As shown, the printing head adopts a laser heat source, and 316L in the powder feeding cylinder is subjected to laser coaxial powder feeding additive manufacturing, a molten pool is formed under the action of a protective gas, and a deposited layer with a layer height of 1 mm is formed by moving the printing head; the corresponding parameters of the machine tool and the laser are as follows: fiber diameter 800 μm, laser wavelength 1064 nm, laser power 800 W, laser spot diameter 2 mm, and scanning speed 600 mm·min -1 ;

[0079] 9) Based on the process parameters of step 8), the additive manufacturing of the complex high-ribbed cylindrical structure is completed.

[0080] The additive manufacturing system of embodiments 1 and 2 is as shown in Figure 4 , wherein the spinning manufactured cylinder 3 (embodiment 1 + short rib 4) is clamped to the chuck of the additive manufacturing device by the clamping mechanism 2, and a C-shaped support 11 is used as the support, a tool clamp 5 for limiting the thermal deformation of the cylinder structure is clamped on the outer wall of the cylinder, the additive manufacturing execution mechanism (printing head) is placed in the cylinder, the additive manufacturing execution mechanism (printing head) 7 is subjected to lifting movement under the action of the lifting device 8, and is subjected to translational movement under the action of the axial movement device 9, a preheating device 6 for heating is further arranged on the execution mechanism, a temperature probe 10 of a temperature measuring device is further arranged on the outer wall of the cylinder, and a heat dissipation fan 1 for heat dissipation and cooling is further arranged at one end of the cylinder.

[0081] The above technical solutions set forth the technical idea of the present application, and cannot limit the protection scope of the present application, and any modification and modification of the above technical solutions according to the technical essence of the present application, without departing from the content of the technical solutions of the present application, belongs to the protection scope of the technical solutions of the present application.

Claims

1. A method for manufacturing a cylindrical structure with internal ribs based on spin forming-additive composite manufacturing, characterized in that: The cylindrical structure is divided into two parts: spinning and additive manufacturing. First, the cylindrical structure is spun, and then the inner rib structure is additively manufactured in the inner cavity of the cylindrical structure. Based on the thickness of the cylindrical structure, the workpiece is divided into two parts: spinning and additive manufacturing. x The threshold for the thickness of the cylindrical structure is defined as follows: when the thickness of the cylindrical structure... h > x At that time, the cylindrical structure formed by spinning is a cylindrical structure without internal ribs, while the internal rib structure formed by additive manufacturing has all internal ribs. When the cylinder thickness h ≤ x In this case, the spin-formed cylindrical structure is a cylindrical body plus short ribs, while the additively manufactured internal rib structure is a high rib, and the combination of short ribs and high ribs constitutes all internal ribs; wherein, the height of the short ribs is ∆ h smaller than h ; in, ; σ The maximum radial stress value generated by additive manufacturing of cylindrical structural materials; l It is half the axial length of the cylinder; E The elastic modulus of the cylindrical structural material; a For additive manufacturing weld width; b The arc length / width of the cylinder surrounding the inner stiffener weld bead in the cylindrical structure is taken as 6-10 times the weld bead width; ω [ ] represents the maximum deformation of the cylindrical structure.

2. The method for manufacturing a cylindrical structure with internal ribs based on spin forming-additive composite manufacturing according to claim 1, characterized in that: Includes the following steps: (1) After modeling the overall data of the workpiece, the data model is divided into two parts based on the thickness of the cylindrical structure: the cylindrical structure model formed by spinning and the internal rib structure model formed by additive manufacturing. (2) Based on the cylindrical structure data model, the workpiece blank is spun using a spinning equipment to complete the manufacturing of the cylindrical structure; (3) Layer and slice the internal rib structure data model, plan the forming trajectory, and generate additive manufacturing data files; (4) The cylindrical structure obtained by spinning is clamped onto the additive manufacturing device, and the additive manufacturing data file obtained in step (3) is imported into the actuator of the additive manufacturing device; (5) Preheat the clamped cylindrical structure to the set temperature. After reaching the set temperature, use the additive manufacturing actuator to carry out additive manufacturing of the inner rib structure in the inner cavity of the spun cylindrical structure. (6) Based on the additive manufacturing data file in step (3), the manufacturing of the cylindrical structure is finally completed.

3. The method for manufacturing a cylindrical structure with internal ribs based on spin forming-additive composite manufacturing according to claim 2, characterized in that: In step (1), the additive manufacturing material is a metal that can be directly energy deposited. The materials used for the spin-formed cylindrical structure and the additively formed inner rib structure are of the same type of alloy.

4. The method for manufacturing a cylindrical structure with internal ribs based on spin forming-additive composite manufacturing according to claim 2, characterized in that: In step (1), additive manufacturing is one of laser deposition manufacturing or arc filament additive manufacturing.

5. A method for manufacturing a cylindrical structure with internal ribs based on spin forming-additive composite manufacturing according to claim 2, characterized in that: In step (1), the spinning process is one of preheated strong spinning or unidirectional multi-pass flow spinning.

6. A method for manufacturing a cylindrical structure with internal ribs based on spin forming-additive composite manufacturing according to claim 2, characterized in that: Step (4) also includes a tooling fixture for clamping and restricting the thermal deformation of the high-inner-ribbed cylindrical structure. The tooling fixture restricts the thermal deformation of the cylindrical structure during the additive manufacturing process by internal and external restraint clamping.

7. A method for manufacturing a cylindrical structure with internal ribs based on spin forming-additive composite manufacturing according to claim 2, characterized in that: In step (6) of the additive manufacturing process, the cylindrical structure makes a circular motion, and the additive manufacturing actuator makes a translational motion along the axis of the cylindrical structure.

8. A method for manufacturing a cylindrical structure with internal ribs based on spin forming-additive composite manufacturing according to claim 7, characterized in that: The circular motion is performed using a positioner, and the additive manufacturing actuator is either a six-axis robot or a three-coordinate machine tool.

9. A method for manufacturing a cylindrical structure with internal ribs based on spin forming-additive composite manufacturing according to claim 2, characterized in that: The step (6) also includes using a temperature measuring device to detect the workpiece temperature. When the upper limit of the interlayer temperature threshold is reached, heat is dissipated to cool down until the interlayer temperature is cooled down to the lower limit of the temperature threshold.

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