Outer longitudinal and transverse rib barrel generating and spinning forming device and improved process thereof

Abstract

An outer longitudinal and transverse rib barrel generating spinning forming device and an improved process thereof comprise a main shaft and blank fixing device, a pair of transmission gear devices arranged on the two sides of one end of the main shaft and blank fixing device, a forming barrel blank arranged at the other end of the main shaft and blank fixing device, and a pair of generating spinning wheel devices connected with the transmission gear devices respectively. Wherein the main shaft and the blank fixing device respectively drive the transmission gear device and the forming cylinder blank to rotate, the transmission gear device is linked with the generating spinning wheel device through the universal joint, and the generating spinning wheel device is contacted with the forming cylinder blank. The generating spinning wheel and the rigid rod of the transmission gear are connected through the universal joint, stable and accurate forming of generating spinning is guaranteed, meanwhile, the defects that existing split type forming of the ribbed cylindrical part is long in machining time and low in material utilization rate are overcome, and the forming device has the advantages of being stable in forming and high in forming quality.

Description

Technical Field

[0001] The invention relates to a technology in the field of mechanical processing, in particular to a device for forming a cylindrical body with outer longitudinal and transverse ribs by spinning and an improved process thereof. Background Art

[0002] External longitudinal and transverse ribbed cylindrical parts are widely used in the aerospace equipment industry such as hypersonic aircraft and rocket fuel tanks. Such components are mostly used in extreme working environments and have the characteristics of high load-bearing, high precision, light weight, and high reliability. The existing forming and manufacturing methods of ribbed cylindrical parts include: milling, chemical milling, welding of ribs and cylinders, and spinning, but all four processes have certain shortcomings. The ribbed cylindrical parts processed by mechanical milling and then rolling have a long processing cycle, high cost, low material utilization rate, and defects such as bulges are prone to occur at the thin wall during the rolling stage, making it difficult to ensure the forming accuracy; the ribbed cylindrical parts processed by chemical milling have fillets at the roots of the ribs with a radius similar to the processing depth, resulting in low precision of the processed ribbed cylindrical parts, which are difficult to meet service requirements; the ribbed cylindrical parts welded by the reinforcing ribs and the cylinder will reduce the reliability of the parts due to the low strength at the weld; the existing spin-formed ribbed cylindrical parts have the advantages of high material utilization rate and high efficiency, but they can only be formed in one pass, it is difficult to ensure the forming accuracy of the ribbed cylindrical parts, there are high requirements for the forming conditions, and different molds are required for different ribbed cylindrical parts, the cost is high, and the general applicability is low. Summary of the invention

[0003] The present invention aims at the existing mechanical gear transmission method that connects the expansion and spinning wheel with the transmission gear through a rigid rod. In the initial forming stage, there is a gap between the two transmission gears, which affects the overlap and transmission stability, resulting in the problem that the outer longitudinal and transverse ribbed cylinder cannot be accurately formed, and the ribbed cylindrical parts can only be formed once, and a mold corresponding to the ribbed cylindrical parts must be provided. The present invention proposes an external longitudinal and transverse ribbed cylinder expansion and spinning forming device and an improved process thereof. The rigid rod connection method of the expansion and spinning wheel and the transmission gear is connected by a universal joint. While ensuring the smooth and accurate forming of the expansion and spinning, the shortcomings of the existing petal-type forming of the ribbed cylindrical parts, such as long processing time and low material utilization rate, are overcome, and the forming device has the advantages of stable forming and high forming quality.

[0004] The present invention is achieved through the following technical solutions:

[0005] The present invention relates to an external longitudinal and transverse rib cylinder expansion and spinning forming device, comprising: a main shaft and a blank fixing device, a pair of transmission gear devices arranged on both sides of one end thereof, a forming cylinder blank arranged at the other end, and a pair of expansion and spinning wheel devices respectively connected to the transmission gear devices, wherein: the main shaft and the blank fixing device respectively drive the transmission gear device and the forming cylinder blank to rotate, the transmission gear device is linked to the expansion and spinning wheel device through a universal joint, and the expansion and spinning wheel device is in contact with the forming cylinder blank.

[0006] The present invention relates to an improved process for an outer longitudinal and transverse rib cylindrical component based on the above device, which is formed by a plurality of small pressing steps, and the spinning wheel is simultaneously fed radially and spins the cylindrical blank for one cycle in each step, specifically comprising:

[0007] The first step is to obtain the target volume V and inner radius r of the outer longitudinal and transverse rib cylinder component through 3D design software according to the required size of the outer longitudinal and transverse rib cylinder component. i and the height h of the formed cylinder. Based on the principle of constant volume before and after forming, the shape and size of the original cylinder blank, i.e. the outer radius, is determined. Inner radius r i and cylinder height h;

[0008] In the second step, according to the shape requirements of the longitudinal and transverse reinforcements of the component, the shape of the developing and spinning wheel is determined based on the developing envelope principle. The modulus of the external longitudinal and transverse reinforcement cylinder component and the developing and spinning wheel is m, and the pitch circle radius of the external longitudinal and transverse reinforcement cylinder component is r. 1 , the number of longitudinal reinforcement is z 1 , the radius of the pitch circle of the spinning wheel is r 2 , the number of longitudinal reinforcement grooves is z 2 , and determine the number of forming passes n and the forming amount of each pass according to the engineering experience formula in is the tooth addendum coefficient, c * is the head clearance coefficient;

[0009] The shape of the unfolding and spinning wheel is determined by the shape of the ribs of the outer longitudinal and transverse rib cylindrical component according to the meshing relationship. Its shape design should ensure that the ribs and rollers do not interfere with each other during the forming process, and keep the contact points from sliding relative to each other during the forming process to ensure the rib forming quality.

[0010] The third step is to determine the transmission ratio according to the size of the outer longitudinal and transverse rib cylinder component and the development and spinning wheel. Since the pitch circle radius of the outer longitudinal and transverse rib cylinder component is r 1 , the radius of the pitch circle of the spinning wheel is r 2 , then the transmission ratio between the tube blank and the spinning wheel is i = r 2 :r 1 , and select the corresponding transmission gear according to the transmission ratio;

[0011] The generating and spinning wheel and the tube blank rotate synchronously at a constant transmission ratio i. A transmission gear is added to the main shaft and the generating and spinning wheel shaft. The module M of the transmission gear is consistent. The size of the transmission gear is determined by the size and transmission ratio of the tube blank and the generating and spinning wheel. The pitch circle radius r of the transmission gear connected to the tube blank is 3 =r 1 、Number of teeth z 3 =r 3 / M, the pitch circle radius of the transmission gear connected to the generating and spinning wheel is r 4 =r 2 、Number of teeth z 4 =r 4 / M, the transmission gear on the main shaft is rigidly connected to the main shaft, the connecting frame of the transmission gear on the developing and spinning wheel remains fixed during the developing and spinning process, and is connected to the developing and spinning wheel through a universal joint. The transmission gear on the developing and spinning wheel and the transmission gear on the main shaft remain in a fully meshed state from beginning to end, and the stable synchronous rotation of the developing and spinning wheel and the main shaft of the tube blank is achieved through the mechanical meshing of the transmission gear on the main shaft and the transmission gear on the developing and spinning wheel shaft.

[0012] The fourth step is to fix the axial limiting sleeve with the mandrel, insert the tube blank on the mandrel, fix the circumferential limiting sleeve with the axial limiting sleeve, and finally fix the gland with the mandrel to realize the constraint of the tube blank;

[0013] The two sides of the barrel blank are widened in the axial direction, and axial and circumferential constraints are added through a pressure cover, an axial limiting sleeve and a circumferential limiting sleeve to suppress diameter expansion.

[0014] The fifth step is to carry out the spinning forming process. The main shaft rotates actively, and the transmission gear connected to the spinning wheel and the transmission gear connected to the main shaft are mechanically meshed and rotated, thereby realizing the synchronous rotation of the two spinning wheels and the blank. The module M of the transmission gear is consistent. The size of the transmission gear is determined by the size and transmission ratio of the barrel blank and the spinning wheel. The pitch circle radius r of the transmission gear connected to the barrel blank 3 =r 1 、Number of teeth z 3 =r 3 / M, the pitch circle radius of the transmission gear connected to the generating and spinning wheel is r 4 =r 2 、Number of teeth z 4 =r 4 / M. Considering the forming process, the existing mechanical gear transmission method connects the forming and spinning wheel and the transmission gear through a rigid rod. In the early stage of forming, there is a gap between the two transmission gears on the main shaft and the forming and spinning wheel, which affects the overlap and transmission stability, resulting in the inability to accurately form the outer longitudinal and transverse rib cylinder. Therefore, the rigid rod connection between the forming and spinning wheel and the transmission gear is improved to a universal joint connection to ensure the smooth and accurate forming of the forming and spinning. During the forming process, the transmission gear moves with the main shaft at a constant speed ω1 The driven wheel rotates and drives the spinning wheel to rotate through the universal joint. The speed ω 2 =ω 1 / i, two spinning wheels simultaneously extrude the tube in the radial direction, radial feed amount The outer ribs are formed until the required number of forming passes n is reached and the processing is completed. Technical Effects

[0015] The present invention uses two developing and spinning wheels with the same structural parameters to be symmetrically distributed on both sides of the tube blank. The two developing and spinning wheels rotate synchronously and in the same direction, and radially feed the extruded blank at a certain feed speed at the same time. In order to ensure that there is no relative sliding between the developing and spinning wheels and the tube blank during the forming process to affect the rib forming, the developing and spinning wheels and the tube blank main shaft need to maintain a constant speed ratio rotation, so that the outer circle of the blank undergoes plastic deformation to form external ribs, until the entire external rib structure is spun out, wherein the shape of the developing and spinning wheels is determined by the rib shape of the longitudinal and transverse rib cylinder according to the developing envelope principle. The mechanical gear transmission mode mechanically meshes the transmission gear connected to the developing and spinning wheels with the transmission gear connected to the tube blank main shaft, and the developing and spinning wheels and the transmission gear are connected by a universal joint, which can realize the stable and precise forming of the developing and spinning wheels and the tube blank with a constant transmission ratio during the forming process, and the constant transmission ratio between the developing and spinning wheels and the tube blank during the forming process, thereby improving the rib forming accuracy and forming quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the device of the present invention;

[0017] Figure 2 It is a schematic diagram of the structure of the spinning wheel tool holder;

[0018] Figure 3 It is a schematic diagram of the structure of the transmission gear transmission gear connecting frame;

[0019] Figure 4 It is a three-dimensional structural schematic diagram of the spinning forming device for the outer longitudinal and transverse rib cylinder synchronously formed by the universal joint;

[0020] Figure 5 A flow chart of a manufacturing method for the spinning forming of an outer longitudinal and transverse rib cylinder synchronously formed by a universal joint;

[0021] Figure 6 It is an overall schematic diagram of the present invention;

[0022] Figure 7 It is a schematic diagram of the shape of the outer longitudinal and transverse rib cylindrical component after processing;

[0023] Figure 8 It is the target outer longitudinal and transverse reinforced cylindrical member. DETAILED DESCRIPTION

[0024] like Figure 1-Figure 6 As shown, this embodiment relates to an external longitudinal and transverse rib cylinder expansion and spinning forming device, comprising: a main shaft and blank fixing device 1, a pair of transmission gear devices 2 arranged on both sides of one end thereof, a forming cylinder blank 4 arranged at the other end, and a pair of expansion and spinning wheel devices 3 respectively connected to the transmission gear devices 2, wherein: the main shaft and blank fixing device 1 respectively drives the transmission gear device 2 and the forming cylinder blank 4 to rotate, the transmission gear device 2 is linked to the expansion and spinning wheel device 3 through a universal joint, and the expansion and spinning wheel device 3 is in contact with the forming cylinder blank 4.

[0025] like Figure 2 As shown, the spindle and blank fixing device 1 includes: a core shaft 1a, a spindle connecting transmission gear 1b, a transmission gear limiting sleeve 1c, an axial limiting sleeve 1d, a radial limiting sleeve 1e and a pressure cover 1f which are sequentially sleeved thereon.

[0026] The forming tube blank 4a is fixedly arranged between the axial limiting sleeve 1d and the pressure cover 1f on the core shaft 1a, and a radial limiting sleeve 1e is arranged on the outer side of the forming tube blank 4a to realize circumferential constraint.

[0027] like Figure 2 and Figure 3 As shown, the transmission gear device 2 includes: a transmission gear connecting frame 2e, a transmission gear shaft 2b arranged thereon, a spreading and spinning wheel connecting transmission gear 2a and a universal joint 2f connected thereto, wherein: the two ends of the universal joint 2f are respectively connected to the transmission gear shaft 2b and the spreading and spinning wheel device 3, and the spreading and spinning wheel connecting transmission gear 2a is meshed with the main shaft connecting transmission gear 1b.

[0028] The main shaft connecting transmission gear 1b is rigidly connected to the core shaft 1a.

[0029] The generating and spinning wheel connecting transmission gear 2a and the main shaft connecting transmission gear 1b are kept in a fully meshed state.

[0030] The transmission gear connecting frame 2e is kept fixed during the developing and spinning process, and the transmission gear shaft 2b is connected to the developing and spinning wheel shaft 3b through a universal joint;

[0031] The transmission gear shaft 2b is provided with a transmission gear limiting sleeve 2c.

[0032] The transmission gear connecting frame 2e is provided with a pressure cover 2d.

[0033] The main shaft connected transmission gear 1b and the expansion and spinning wheel connected transmission gear 2a have the same module, and the size is determined by the size and transmission ratio of the tube blank and the expansion and spinning wheel. The forming expansion and spinning wheel is determined by the meshing relationship of the ribbed long tube component. During the forming process, the transmission gear connected to the expansion and spinning wheel is fully meshed with the transmission gear connected to the main shaft and only performs rotational movement. The expansion and spinning wheel performs rotational movement and radial feed movement through the power transmission and feed system of the universal joint, thereby realizing stable and precise forming of the outer longitudinal and transverse ribbed cylinder.

[0034] like Figure 5 As shown, the developing and spinning wheel device 3 includes: a developing and spinning wheel 3a arranged on a tool holder 3e through a developing and spinning wheel shaft 3b, wherein: the developing and spinning wheel shaft 3b is connected to the corresponding transmission gear device 2 through a universal joint, and the tool holder 3e is connected to the tool shaft of the spinning machine, and the synchronous radial feeding of the developing and spinning wheel is achieved by controlling the two tool shafts.

[0035] The developing and spinning wheel shaft 3b is provided with a developing and spinning wheel limiting sleeve 3c.

[0036] The tool holder 3e is provided with a pressure cover 3d.

[0037] The said forming and spinning wheel 3a is specifically: based on the target outer longitudinal and transverse rib cylindrical component, the forming and spinning wheel shape is determined according to the forming envelope principle, wherein the outer longitudinal and transverse rib cylindrical component and the forming and spinning wheel have the same module m, and the outer longitudinal and transverse rib cylindrical component has a pitch circle radius r 1 , the number of longitudinal reinforcement is z 1 , the radius of the pitch circle of the spinning wheel is r 2 , the number of longitudinal reinforcement grooves is z 2 , the radius of the pitch circle of the spinning wheel must satisfy r 2 =r 1 ·z 2 / z 1 .

[0038] like Figure 7 As shown, it is the target outer longitudinal and transverse reinforcement cylindrical component.

[0039] like Figure 7 , Figure 8 As shown, the improved process of forming the outer longitudinal and transverse rib cylinder body by spinning is shown in this embodiment based on the above-mentioned device, including:

[0040] S01. After installing the tube blank sample 4a into the core shaft 1a, fix the circumferential limit sleeve 1e of the blank fixing device and the pressure cover 1f with bolts to realize axial and circumferential constraints of the tube blank sample, move the two developing and spinning wheels radially through the tool shaft of the spinning machine until they are in contact with the tube blank, keep the main shaft connecting transmission gear and the developing and spinning wheel connecting transmission gear in a fully meshed state, and fix the connecting frame of the developing and spinning wheel connecting transmission gear.

[0041] S02 starts the unfolding and spinning forming device, so that the main shaft rotates at a specified speed, and the two unfolding and spinning wheels are connected to the transmission gear through the main shaft to drive the transmission gear to rotate stably, and then the rotation of the unfolding and spinning wheels is realized through the power transmission of the universal joint; the spinning machine tool axis connected to the unfolding and spinning wheel device 3 is started, and synchronous step-by-step radial feeding is performed, and the longitudinal and transverse ribs are unfolded and spun in turn until the required number of forming passes is reached, and the processing is completed to obtain a high-precision cylindrical component with external longitudinal and transverse ribs.

[0042] After specific practical experiments, the modulus of the target outer longitudinal and transverse reinforcement cylindrical component is m=2, and the inner radius is r i =50mm, pitch circle radius r 1 =60mm, number of longitudinal bars z 1 =20 and the height of the cylindrical component h = 30mm, the inner radius of the cylinder blank r i =50mm, outer radius r o = 60.5mm and the height of the forming cylinder h = 30mm, the module of the spinning wheel m = 2, the pitch circle radius r 2 =60mm, number of longitudinal reinforcement grooves z 2 =20 and the height of the spinning wheel h = 30mm, the outer longitudinal and transverse rib cylindrical component, the cylindrical blank and the spinning wheel, the spindle speed ω 1 The above device is operated with the parameters of =0.4πrad / s, number of unfolding and spinning wheel passes n=5, total feed amount of unfolding and spinning wheel s=2.5mm and feed speed v=0.1mm / s. The experimental data that can be obtained are: compared with the outer longitudinal and transverse rib cylindrical components formed without adopting the improved process, the outer longitudinal and transverse rib cylindrical components formed by the improved process have a rib height increased by 6.24%, reaching the target height of 4.5mm, and the rib fullness increased by 8.83%, reaching 99.56% of the target rib fullness.

[0043] Compared with the prior art, the present invention adopts a mechanical gear transmission method to mechanically mesh the transmission gear connected to the expansion and spinning wheel and the transmission gear connected to the main shaft of the tube blank. The expansion and spinning wheel and the transmission gear are connected by a universal joint to ensure the close fit between the transmission gears in the entire expansion and spinning forming stage, thereby realizing the smooth and high-precision forming of the cylindrical components with external longitudinal and transverse ribs during the forming process.

[0044] The above-mentioned specific implementation can be partially adjusted in different ways by those skilled in the art without departing from the principle and purpose of the present invention. The protection scope of the present invention shall be based on the claims and shall not be limited by the above-mentioned specific implementation. Each implementation scheme within its scope shall be subject to the constraints of the present invention.

Claims

1. An external longitudinal and transverse rib cylinder forming spinning device and its improved process, characterized in that: include: A main shaft and a blank fixing device, a pair of transmission gear devices arranged on both sides of one end thereof, a forming tube blank arranged at the other end, and a pair of developing and spinning wheel devices respectively connected to the transmission gear devices, wherein: the main shaft and the blank fixing device respectively drive the transmission gear device and the forming tube blank to rotate, the transmission gear device is linked to the developing and spinning wheel device through a universal joint, and the developing and spinning wheel device is in contact with the forming tube blank.

2. The outer longitudinal and transverse rib cylinder forming spinning device and its improved process according to claim 1 is characterized in that: The spindle and blank fixing device comprises: a core shaft, a spindle connecting transmission gear, a transmission gear limiting sleeve, an axial limiting sleeve, a radial limiting sleeve and a pressure cover which are sequentially sleeved thereon; The forming tube blank is fixedly arranged between the axial limiting sleeve and the pressure cover on the core shaft, and a radial limiting sleeve is arranged on the outer side of the forming tube blank to realize circumferential constraint.

3. The outer longitudinal and transverse rib cylinder forming spinning device and its improved process according to claim 2 is characterized in that: The transmission gear device comprises: a transmission gear connecting frame, a transmission gear shaft arranged thereon, a generating and spinning wheel connecting transmission gear and a universal joint connected thereto, wherein: two ends of the universal joint are respectively connected to the transmission gear shaft and the generating and spinning wheel device, and the generating and spinning wheel connecting transmission gear is meshed with the main shaft connecting transmission gear; The generating and spinning wheel connecting transmission gear and the main shaft connecting transmission gear are kept in a fully meshed state; The transmission gear connecting frame is kept fixed during the spinning process, and the transmission gear shaft is connected to the spinning wheel shaft through a universal joint; The transmission gear shaft is provided with a transmission gear limiting sleeve.

4. The outer longitudinal and transverse rib cylinder forming spinning device and its improved process according to claim 1 is characterized in that: The generating and spinning wheel device comprises: a generating and spinning wheel arranged on a tool holder through a generating and spinning wheel shaft, wherein: the generating and spinning wheel shaft is connected to a corresponding transmission gear device through a universal joint, the tool holder is connected to a tool shaft of a spinning machine, and synchronous radial feeding of the generating and spinning wheel is achieved by controlling the two tool shafts; The developing and spinning wheel shaft is provided with a developing and spinning wheel limiting sleeve.

5. The outer longitudinal and transverse rib cylinder expansion spinning forming device and its improved process according to claim 4 is characterized in that: The unfolding and spinning wheel is specifically as follows: based on the target external longitudinal and transverse rib cylindrical component, the shape of the unfolding and spinning wheel is determined according to the unfolding envelope principle, wherein the module of the external longitudinal and transverse rib cylindrical component and the unfolding and spinning wheel is the same as m, the pitch circle radius of the external longitudinal and transverse rib cylindrical component is r1, the number of longitudinal ribs is z1, the pitch circle radius of the unfolding and spinning wheel is r2, the number of longitudinal rib grooves is z2, and the pitch circle radius of the unfolding and spinning wheel needs to satisfy r2=r1·z2 / z1.

6. An improved process for outer longitudinal and transverse rib cylindrical components based on the device described in any one of claims 1 to 5, characterized in that: Through multiple passes of small reduction forming, the spinning wheel is simultaneously fed radially and spins the tube blank for one circle in each pass, specifically including: The first step is to obtain the target volume V and inner radius r of the outer longitudinal and transverse rib cylinder component through 3D design software according to the required size of the outer longitudinal and transverse rib cylinder component. i and the height h of the formed cylinder. Based on the principle of constant volume before and after forming, the shape and size of the original cylinder blank, i.e. the outer radius, is determined. Inner radius r i and cylinder height h; In the second step, according to the shape requirements of the longitudinal and transverse ribs of the component, the shape of the forming and spinning wheel is determined based on the principle of forming envelope. The modulus of the outer longitudinal and transverse rib cylinder component and the forming and spinning wheel are both m, the pitch circle radius of the outer longitudinal and transverse rib cylinder component is r1, the number of longitudinal ribs is z1, the pitch circle radius of the forming and spinning wheel is r2, the number of longitudinal rib grooves is z2, and the number of forming passes n and the forming amount of each pass are determined according to the engineering experience formula. in is the tooth addendum coefficient, c * is the head clearance coefficient; The third step is to determine the transmission ratio according to the size of the outer longitudinal and transverse rib cylinder component and the developing and spinning wheel. Since the pitch circle radius of the outer longitudinal and transverse rib cylinder component is r1 and the pitch circle radius of the developing and spinning wheel is r2, the transmission ratio of the cylinder blank and the developing and spinning wheel is i=r2:r1, and the corresponding transmission gear is selected according to the transmission ratio; The fourth step is to fix the axial limiting sleeve with the mandrel, insert the tube blank on the mandrel, fix the circumferential limiting sleeve with the axial limiting sleeve, and finally fix the gland with the mandrel to realize the constraint of the tube blank; The fifth step is to carry out the expansion and spinning forming process. The main shaft rotates actively, and the transmission gear connected to the expansion and spinning wheel and the transmission gear connected to the main shaft are mechanically meshed and rotated, so as to realize the synchronous rotation of the two expansion and spinning wheels and the blank. The module M of the transmission gear is consistent. The size of the transmission gear is determined by the size of the tube blank and the expansion and spinning wheel and the transmission ratio. The pitch circle radius of the transmission gear connected to the tube blank is r3=r1, and the number of teeth is z3=r3 / M. The pitch circle radius of the transmission gear connected to the expansion and spinning wheel is r4=r2, and the number of teeth is z4=r4 / M. During the forming process, the transmission gear rotates with the main shaft at a constant speed ω1, and drives the expansion and spinning wheel to rotate through the universal joint. The speed ω2=ω1 / i, and the two expansion and spinning wheels simultaneously extrude the tube blank in the radial direction, and the radial feed amount The outer ribs are formed until the required number of forming passes n is reached and the processing is completed.

7. The improved process for outer longitudinal and transverse rib cylindrical components according to claim 6 is characterized in that: The shape of the unfolding and spinning wheel is determined by the shape of the ribs of the outer longitudinal and transverse rib cylindrical component according to the meshing relationship. Its shape design should ensure that the ribs and rollers do not interfere with each other during the forming process, and keep the contact points from sliding relative to each other during the forming process to ensure the rib forming quality.

8. The improved process for outer longitudinal and transverse rib cylindrical components according to claim 6 is characterized in that: The developing and spinning wheel rotates synchronously with the tube blank at a constant transmission ratio i, and a transmission gear is added to the main shaft and the developing and spinning wheel shaft. The module M of the transmission gear is kept consistent, and the size of the transmission gear is determined by the size and transmission ratio of the tube blank and the developing and spinning wheel. The pitch circle radius of the transmission gear connected to the tube blank is r3=r1, and the number of teeth is z3=r3 / M. The pitch circle radius of the transmission gear connected to the developing and spinning wheel is r4=r2, and the number of teeth is z4=r4 / M. The transmission gear on the main shaft is rigidly connected to the main shaft, and the connecting frame of the transmission gear on the developing and spinning wheel remains fixed during the developing and spinning process, and is connected to the developing and spinning wheel through a universal joint. The transmission gear on the developing and spinning wheel maintains a fully meshed state with the transmission gear on the main shaft from beginning to end, and the stable synchronous rotation of the developing and spinning wheel and the tube blank main shaft is achieved through the mechanical meshing of the transmission gear on the main shaft and the transmission gear on the developing and spinning wheel shaft.

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