A complex curved bus local split spinning forming method

Abstract

The application discloses a complex curved generatrix local split spinning forming method and belongs to the technical field of complex curved generatrix spinning forming. The method comprises the following steps: S1 blank preparation: according to the size of a target spinning part and the principle of constant volume of a deformation region, the size of a prefabricated blank is determined and the blank is prepared, S2 mold preheating: an induction heating system is used to preheat the mold to 70-80 DEG C, S3 blank installation, S4 blank heating: the spindle is rotated at a low speed, the blank is heated to 700-800 DEG C by using the induction heating system, S5 cutting point separation, S6 local spinning: the forming support disc used in separation is removed, a split type forming support disc is installed, the spinning machine is started and the temperature of a deformation region is maintained at 700-800 DEG C through a heat supplementing device, and multi-pass spinning forming is carried out. The complex curved generatrix local split spinning forming method has the advantages of flexible forming process, high material utilization rate, high processing efficiency, strong adaptability and the like for the manufacturing requirement of hub type complex curved surface parts, and can improve the material strength performance.

Description

Technical Field

[0001] This invention relates to the field of complex curved busbar spinning technology, and more specifically, to a method for spinning a complex curved busbar by partially splitting it. Background Technology

[0002] With the continuous development of the automotive industry, high-performance, high-speed, and heavy-load automotive wheels are widely used. However, due to limitations in manufacturing processes, wheel manufacturing currently mainly relies on machining, 3D printing, casting, and welding. Generally, the dimensions of machined blanks are much larger than the required thickness, necessitating extensive turning and milling operations to achieve the target dimensions. This method suffers from high material waste, low efficiency, and large equipment requirements. 3D printing technology is complex, unstable, costly, and has a long production cycle. Casting processes are prone to internal defects and have low microstructure and properties. Welding processes require highly skilled welders, and internal defects and localized deformation are difficult to control. These manufacturing processes struggle to meet high load-bearing requirements, directly impacting wheel safety and stability. Therefore, we propose a method for locally splitting and spinning complex curved generatrices. Summary of the Invention

[0003] The purpose of this invention is to provide a method for locally splitting and spinning complex curved generatrices to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] A method for locally splitting and spinning complex curved generatrices includes the following steps:

[0006] S1 Blank Preparation: Based on the principle that the size of the target spun part and the volume of the deformation area remain unchanged, the size of the pre-made blank is determined and the blank is prepared. Non-destructive testing and physicochemical property testing are performed on the blank.

[0007] S2 mold preheating: Before the splitting and cutting point separation operation, the mold is preheated to 70-80℃ using an induction heating system. After setting the heating temperature, the heating system calculates the heating time based on the heating power and feeds back the mold heating temperature to the temperature control and detection system through the temperature sensing system.

[0008] S3 billet installation: When the mold reaches the set temperature, install the billet onto the mold, add a pressure plate and stop hole on the top of the mold, and fix it with bolts;

[0009] S4 billet heating: After the billet is installed, start the spinning machine. The main shaft rotates at low speed and the induction heating system heats the billet to 700-800℃. The temperature of the deformation zone is monitored in real time by the temperature measuring device and fed back to the heating device. The heating device automatically adjusts the heating temperature according to the set temperature.

[0010] S5 Cutting Point Separation: When the temperature of the deformation zone reaches the set temperature, the spinning equipment is started, and the spinning separation method is used to separate the blank at the spinning cutting point. When the spinning wheel enters the predetermined position, the outer shape of the spinning wheel is tangent to the unseparated part of the spun part. The spinning wheel has both separation and forming functions. A forming support plate is set on the outer surface of the separated part to orient the material flow during material separation.

[0011] S6 Local Spinning: After separation, remove the forming support plate used during separation, install the segmented forming support plate, start the spinning machine and maintain the temperature of the deformation zone at 700-800℃ through the heating device, and perform multi-pass spinning forming.

[0012] S7: After spinning is completed, change the cutting tool to machine the spun part; disassemble the spun part when it has cooled naturally to 50-60℃, and check the matching degree between the outer surface and the theoretical surface through three-dimensional scanning.

[0013] Preferably, the induction heating system includes a heating power control module, a temperature sensing module, and a temperature control detection module. The heating power control module is used to set the heating temperature and calculate the heating time, the temperature sensing module is used to monitor the mold temperature in real time, and the temperature control detection module is used to receive temperature feedback and perform control.

[0014] Preferably, the heating device is linked with the temperature measuring device, and can automatically adjust the heating power according to the temperature information fed back by the temperature measuring device, so as to achieve precise control of the temperature of the deformation zone.

[0015] Preferably, the segmented forming support plate is fixed to the mold with bolts, which facilitates disassembly after spinning.

[0016] Preferably, in step S5, the rotating wheel is selected with an R angle of R1, and the value of R1 is in the range of 8-12mm;

[0017] The separation guide surface of the forming support plate forms a material flow guiding angle of 15°-20° with the R angle of the rotating wheel, so that the material generates directional plastic flow along the rotating wheel profile during separation, forming a separation interface with roughness Ra≤1.2μm;

[0018] The synergistic effect of the spinning wheel and the forming support plate ensures that the angle between the resultant force of the separation force and the forming force and the normal of the target curve generatrix is ​​≤5°, thus ensuring the preforming accuracy of the unseparated area.

[0019] Preferably, in step S4, the temperature measuring device and the heating device constitute a dynamic temperature compensation system, specifically including:

[0020] Infrared thermal imagers are used to scan the temperature distribution in the deformation zone in real time, with a temperature measurement frequency ≥100Hz.

[0021] The heating device dynamically adjusts the heating power based on the temperature feedback signal using a PID control algorithm, so that the temperature fluctuation during the heating stage is ≤±5℃ and the temperature fluctuation during the spinning stage is ≤±3℃.

[0022] Preferably, in step S6, the process parameters for the multi-pass spinning are:

[0023] Number of passes: 3-5 passes, with the first pass achieving a thinning rate of 15%-20%, and subsequent passes decreasing the thinning rate by 5%-8%;

[0024] Roller feed speed: 0.5-1.5 mm / r, with the feed speed of the last pass reduced by 30%-40% to improve surface quality;

[0025] Spinning ratio: Controlled between 2.5 and 4.0 to avoid material cracking due to excessive deformation.

[0026] Preferably, in step S2, the heating power of the induction heating system is 5-15kW.

[0027] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0028] (1) The complex curved generatrix local splitting spin forming method of the present invention is designed for the manufacturing needs of complex curved surface parts such as wheel hubs. The forming process is flexible and has many advantages such as high material utilization, high processing efficiency and strong adaptability. It can also improve the strength performance of materials and can be applied to a variety of complex curved surface wheel hubs. By precisely matching the outer shape of the spinning wheel with the surface of the unseparated area of ​​the wheel hub, and with the forming support plate guiding the material to flow in a directional manner, the complex curved surfaces such as wheel hub rims and spokes can be formed in one spin forming. This solves the precision problem of large curvature transition area that is difficult to process by traditional forging + machining. The generatrix profile deviation is controlled within ±0.15mm, which meets the aerodynamic shape and lightweight design requirements of high-end wheel hubs. The multi-pass spinning process improves the uniformity of wheel hub wall thickness compared with traditional processes. Especially for the variable cross-section spoke area, the wall thickness can be precisely controlled, avoiding stress concentration caused by uneven wall thickness and improving the fatigue resistance of the wheel hub.

[0029] (2) During the spinning separation process of this invention, the material undergoes local plastic deformation along the radius R of the spinning wheel. The work hardening effect increases the tensile strength of the separation surface edge, while the grains are refined along the flow direction. The yield strength of the key stress area of ​​the wheel rim is higher than that of the cast blank, meeting the dual requirements of lightweight and high load-bearing capacity for new energy vehicle wheel hubs. Based on the principle of constant volume, the blank design, combined with the simultaneous spinning separation-forming process, has a high material utilization rate and reduces material waste compared to traditional machining processes. It is especially suitable for the manufacturing of wheel hubs made of valuable materials such as titanium alloys and high-strength aluminum alloys. Attached Figure Description

[0030] Figure 1This is a schematic diagram of a complex curved generatrix partially split and spun part according to the present invention;

[0031] Figure 2 This is a schematic diagram of the complex curved busbar before partial separation according to the present invention;

[0032] Figure 3 This is a schematic diagram illustrating the completion of partial separation of the complex curved busbar in this invention;

[0033] Figure 4 This is a schematic diagram illustrating the completion of local spinning of the complex curved busbar of the present invention.

[0034] The labels in the diagram are as follows: 1. Spinning equipment; 2. Temperature monitoring and control system; 3. Forming support plate; 4. Partial separation of complex curved generatrices; 5. Forming mold; 6. Pressure plate; 7. Splitting wheel; 8. Heating device. Detailed Implementation

[0035] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0036] Example:

[0037] Please see Figure 1-4 A method for locally splitting and spinning complex curved generatrices includes the following steps:

[0038] S1 blank preparation: Based on the principle of maintaining the size of the target spun part and the volume of the deformation area, the dimensions of the pre-formed blank are determined, such as... Figure 1 As shown, for the dashed areas that did not participate in spinning, the billet dimensions should be consistent with the drawing, and the total height before and after spinning should be the same. The billet height should be directly taken as the height of the product after spinning. Figure 1 In the figure, φD represents the diameter of the spun part at the opening, and h represents the height of the spun part. The original dimensions of the deformation area are calculated using the volume formula. The blank is prepared by forging / casting / machining, and non-destructive testing and physicochemical property testing are performed on the blank to eliminate internal defects. Specifically, for the deformation area, the original blank thickness is calculated using the constant volume formula V0=V1, where V0 is the volume of the blank before deformation and V1 is the volume of the spun part after deformation. The calculation formula is as follows: In the formula, h0 is the original thickness of the billet, and A i h represents the cross-sectional area of ​​each deformation zone of the spun part. i For the corresponding height, A0 is the initial cross-sectional area of ​​the billet deformation zone.

[0039] like Figure 1As shown, based on the final spun part's dimensions, structure, and machining allowance, it can be seen that the wall thickness and shape at the dotted line position in the drawing did not participate in the spun forming. Therefore, the blank size within the dotted line area can be consistent with the spun drawing. At the same time, the total height before and after spun is consistent, so the height of the spun blank can be referenced to the height of the product after spun. The spun part blank only needs to calculate the original blank size by considering the changes in the length and thickness of the area involved in deformation, according to the relationship of unchanged volume before and after spun. The pre-spun blank is obtained through forging / casting / spun forming and machining (this application adopts sheet metal-spun pre-spun blank-rim splitting spun forming). Non-destructive testing is performed on the blank to eliminate internal defects and to test its physical and chemical properties.

[0040] S2 Mold Preheating: Before the splitting and separation operation at the cutting point, the mold is preheated to 70-80℃ to prevent it from absorbing too much of the billet's heat during forming, which could lead to insufficient forming temperature and defects. An induction heating system is used to preheat the mold. The heating temperature is set, and the system calculates the heating time based on the heating power. The temperature sensor feeds back the mold's heating temperature to the temperature control and detection system. Based on a PID control algorithm, the heating power is dynamically adjusted according to the feedback signal from the temperature sensor module to stabilize the mold temperature at 70-80℃.

[0041] Specifically, precise temperature setting and heating time calculation: The heating power of the induction heating system is 5-15kW, and the preheating time is calculated according to the mold volume using the formula. Calculate, where V is the mold volume, ρ is the density of the mold material, and c is the specific heat capacity. Where P is the target temperature rise and P is the heating power. For improved thermal efficiency, precise calculation of preheating time avoids overheating or underheating problems caused by traditional experience-based heating methods.

[0042] The induction heating system includes a heating power control module, a temperature sensing module, and a temperature control and detection module. The heating power control module sets the heating temperature and calculates the heating time. The temperature sensing module monitors the mold temperature in real time, and the temperature control and detection module receives temperature feedback and performs control. An infrared thermal imager or thermocouple array is used to scan the temperature distribution on the mold surface at a frequency of ≥100Hz, with particular focus on key areas where the mold contacts the workpiece. A temperature cloud map is generated in real time and transmitted to the control and detection system, solving the problem of localized overheating or low-temperature blind spots caused by traditional single-point temperature measurement and ensuring uniform temperature on the mold surface. When a temperature difference exceeding 5℃ or an abnormal heating rate (e.g., <8℃ / s for 30 seconds) is detected, an audible and visual alarm is automatically triggered, and heating is paused to prevent workpiece forming defects caused by heating system malfunctions.

[0043] S3 billet installation: When the mold is preheated to the set temperature, install the billet onto the mold to prevent the billet from moving during the spinning process. Add a pressure plate 6 and a stop hole to the top of the mold and fix it with bolts. During installation, use bolts to connect and lock the pressure plate 6, the billet, and the mold.

[0044] S4 Billet Heating: After the billet is installed, the spinning machine is started, and the spindle rotates at low speed. The induction heating system heats the billet to 700-800℃. A temperature measuring device monitors the temperature of the deformation zone in real time and feeds it back to the supplementary heating device. The supplementary heating device automatically adjusts the heating temperature according to the set temperature to ensure that the temperature of the deformation zone meets the process requirements. The spindle rotates at a low speed of 5-10 r / min, ensuring that all parts of the billet receive uniform induction heating and avoiding local overheating or undercooling. The rotary heating method can reduce the circumferential temperature difference of the billet from ±50℃ in static heating to ±15℃, and the axial temperature difference from ±30℃ to ±8℃, significantly improving the uniformity of the temperature field and providing a stable material plasticity state for subsequent spinning. The low-speed rotation causes the relative position of the induction coil and the billet to change dynamically, avoiding the melting of material grain boundaries caused by prolonged heating in a fixed position.

[0045] Specifically, the temperature measuring device and the heating device constitute a dynamic temperature compensation system, which includes:

[0046] An infrared thermal imager is used to scan the temperature distribution in the deformation zone in real time, with a measurement frequency ≥100Hz. A dual-wavelength infrared thermometer is used to monitor the temperature of the area where the rotating wheel contacts the billet in real time via a non-contact method. This area generates additional heat due to plastic deformation, and the thermometer can distinguish between the contribution of deformation heat and induction heating, providing accurate feedback for the heating device. In practical applications, this technology reduces the measurement error of the temperature in the deformation zone and effectively avoids localized softening of the material due to the accumulation of deformation heat.

[0047] The heating device dynamically adjusts the heating power using a PID control algorithm based on temperature feedback signals, ensuring temperature fluctuations of ≤±5℃ during the heating phase and ≤±3℃ during the spinning phase. The PID control algorithm uses a proportional coefficient Kp=0.8, an integral coefficient Ki=0.3, and a derivative coefficient Kd=0.1. The heating device consists of 3-5 independent heating units distributed along the billet's axial direction, each with a power of 5-10kW, which can be individually adjusted based on temperature feedback. For example, when the temperature at the bottom of the billet is detected to be 10℃ lower than the target value, the corresponding unit automatically increases its power by 2kW to ensure consistent deformation across all parts of the complex curved busbar.

[0048] Establish a material temperature drop model The system predicts heat loss, where T0 is the target temperature, Q is the heat loss per unit time, m is the billet mass, and c is the material's specific heat capacity. This allows the heating device to adjust the heating power in advance or in real time based on the predicted temperature drop trend, stabilizing the billet deformation zone temperature within the required process range of 700-800℃. Compared to model-less open-loop control, this significantly improves temperature control accuracy, preventing defects such as reduced material plasticity and difficulty in deformation due to insufficient temperature, or overheating and coarse grains due to excessive temperature.

[0049] S5 Cutting Point Separation: When the temperature of the deformation zone reaches the set temperature, the spinning equipment is started, and the spinning separation method is used to separate the blank at the local spinning cutting point. Spinning separation can make the metal flow in a specified direction, so that the material is squeezed and flows in a directional manner, which enhances its internal structure and mechanical properties. The spinning wheel is selected with an R angle of R1. When the spinning wheel is spun into the predetermined position, the outer shape of the spinning wheel is tangent to the unseparated part of the spinning part. The spinning wheel acts as a forming wheel. At the same time, the outer surface of the separated part is provided with a forming support plate 3 to orient the material flow during separation, so as to avoid the blank at the separation point from expanding outwards severely, which would increase the difficulty of subsequent spinning forming.

[0050] In specific step S5, the value of R1 ranges from 8 to 12 mm. When R1 < 8 mm (e.g., 5-7 mm), the radius of curvature of the rotary wheel is too small, resulting in a sharp increase in contact stress during separation (σ = K / R, where K is a material constant). When this exceeds the tensile strength threshold of the material, it is prone to edge tearing defects, especially affecting plastic-sensitive materials such as magnesium alloys and titanium alloys. When R1 > 12 mm (e.g., 13-15 mm), the directional extrusion capability of the rotary wheel on the material decreases, and the material at the separation interface exhibits disordered extension due to insufficient flow resistance, resulting in excessive roughness of the separation surface (Ra > 1.6 μm) and edge wavy deformation, increasing the difficulty of subsequent forming correction. When R1 is in the range of 8-12 mm, the contact stress is controlled at 1.2-1.5 times the yield strength of the material (σ = 1.2-1.5σs), which not only forms effective shear separation but also guides the material to flow orderly along the tangential direction through the rotary wheel profile, achieving the optimal balance between separation surface accuracy (Ra ≤ 1.2 μm) and forming quality.

[0051] The conformity of the spun wheel shape with the non-separated part of the spun part is ≥98%, and the surface error is ≤±0.05mm;

[0052] The separation guide surface of the forming support plate 3 forms a material flow guiding angle of 15°-20° with the R angle of the spinning wheel, so that the material generates directional plastic flow along the surface of the spinning wheel during separation, forming a separation interface with a roughness Ra≤1.2μm; the resultant force direction of the separation force and the forming force is exactly matched with the curvature change trend of the complex generatrix, breaking through the technical bottleneck of uneven force field distribution in traditional spinning separation.

[0053] The synergistic effect of the spinning wheel and the forming support plate ensures that the angle between the resultant force of the separation force and the forming force and the normal of the target curve generatrix is ​​≤5°, thus ensuring the preforming accuracy of the unseparated area.

[0054] S6 Partial Spinning: After material separation at the cutting point is completed, the forming support plate used during partial separation is removed, and the segmented forming support plate used for partial spinning is installed and fixed. The spinning machine is started, and the temperature of the deformation zone is maintained at 700-800℃ by the heating device 8 for multi-pass spinning. The segmented forming support plate is fixed to the mold with bolts for easy disassembly after spinning. The parameterized design of the segmented forming support plate and the rotary wheel R angle allows for quick switching between wheel molds with different curvature radii, enabling flexible production of multi-specification wheel hubs. The changeover time is reduced compared to traditional tooling, meeting the R&D needs of automotive OEMs for small batches and multiple varieties. Before partial spinning, the forming support plate should be... Figure 3 The forming support plate used during the corresponding local separation is removed and installed. Figure 4 The segmented forming support plate used in the corresponding local spinning forming process facilitates disassembly after spinning.

[0055] Specifically, in step S6, the process parameters for multi-pass spinning are as follows:

[0056] Number of passes: 3-5 passes, with the first pass achieving a thinning rate of 15%-20%, and subsequent passes decreasing the thinning rate by 5%-8%;

[0057] Roller feed speed: 0.5-1.5 mm / r, with the feed speed of the last pass reduced by 30%-40% to improve surface quality;

[0058] Spinning ratio: Controlled between 2.5 and 4.0 to avoid material cracking due to excessive deformation.

[0059] S7: After spinning is completed, change the cutting tool to machine the spun part to the required number; then, when the spun part has cooled naturally to 50-60℃, disassemble it and use 3D scanning to check the matching degree between the outer surface and the theoretical surface to check whether the spun part meets the requirements.

[0060] In this application, the heating device is linked with the temperature measuring device, and can automatically adjust the heating power according to the temperature information fed back by the temperature measuring device, so as to achieve precise control of the temperature of the deformation zone.

[0061] The complex curved generatrix partial splitting spin forming process provided by this invention addresses the manufacturing needs of complex curved surface parts such as wheel hubs. Through process innovation and tooling optimization, it exhibits significant advantages in forming accuracy, material properties, and production efficiency. Adaptability to complex curved generatrixes: By precisely matching the shape of the spinning wheel with the profile of the non-separated area of ​​the wheel hub, and with the forming support plate guiding the directional flow of material, one-time spin forming of complex curved surfaces such as wheel hub rims and spokes can be achieved. This solves the accuracy problem of large curvature transition areas that are difficult to process using traditional forging and machining. The generatrix profile deviation is controlled within ±0.15mm, meeting the aerodynamic shape and lightweight design requirements of high-end wheel hubs. The multi-pass spinning process improves the uniformity of wheel hub wall thickness compared to traditional processes, especially for variable cross-section spoke areas, achieving precise wall thickness control at the 0.3mm level. This avoids stress concentration caused by uneven wall thickness and improves the fatigue resistance of the wheel hub. During spin forming, the localized plastic deformation of the material along the radius (R) of the spin wheel, along with the work hardening effect, increases the tensile strength of the separation surface edge. Simultaneously, the grains are refined along the flow direction, resulting in a higher yield strength in the critical stress areas of the wheel rim compared to the cast blank. This meets the dual requirements of lightweight and high load-bearing capacity for new energy vehicle wheels. The blank design, based on the principle of constant volume, combined with the simultaneous spin forming and separation process, ensures high material utilization. Process integration shortens the cycle time: Compared to the traditional process of "cast blank → multi-pass machining → forming," the wheel rim processing is completed through 7 core processes: "blank installation → separation forming → localized spin forming." This reduces 2-3 machining / annealing processes compared to traditional methods, shortening the production cycle, reducing single-piece processing time, and significantly improving batch production efficiency. Preheating the mold to 70-80℃ prevents edge cracking due to sudden cooling, and dynamically supplementing the blank heating to 700-800℃ ensures consistent material plasticity, reducing the surface micro-crack defect rate during wheel rim spin forming and improving the ultrasonic testing pass rate of critical wheel rim areas. After spinning, the theoretical profile is compared with the actual profile using a laser 3D scanner. Key parameters such as rim radial runout and spoke surface profile are monitored in real time. Defective products can be corrected by local spinning, which can significantly reduce the scrap rate.

[0062] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A complex curved generatrix local split flow forming method, characterized in that, It comprises the following steps: S1 blank preparation: according to the size of the target spinning part and the principle of constant volume of deformation region, the size of the preform blank is determined and the blank is prepared, and the nondestructive testing and physical and chemical performance testing are carried out; wherein the size of the deformation region is calculated according to the volume invariable formula V0=V1, V0 is the volume before deformation of the blank, V1 is the volume after deformation of the spinning part, and the calculation formula is: , wherein h0 is the original thickness of the blank, A i is the cross-sectional area of the spinning part, h i is the corresponding height, A0 is the initial cross-sectional area of the blank deformation region; the size of the blank in the region not participating in the spinning is consistent with the size of the corresponding region of the target spinning part, and the total height of the blank is the same as the height of the product after spinning; S2 mold preheating: before the split cutting point separation operation, the mold is preheated to 70-80℃ by an induction heating system; the induction heating system includes a heating power control module, a temperature sensing module and a temperature control detection module, the heating power control module is used to set the heating temperature and press the formula Calculate the heating time, where V is the volume of the mold, p is the density of the mold material, c is the specific heat capacity, The target temperature rise is P, the heating power is The thermal efficiency is; the temperature sensing module is used to monitor the mold temperature in real time, the temperature sensing module uses an infrared thermal imager or a thermocouple array to monitor the mold temperature in real time at a frequency of ≥100Hz; the temperature control detection module is used to receive temperature feedback and dynamically adjust the heating power based on the PID control algorithm; the heating power of the induction heating system is 5-15kW; when the mold temperature difference is detected to exceed 5℃ or the temperature rise rate is <8℃ / s for 30 seconds, the audible light alarm is automatically triggered and the heating is paused; S3 blank installation: when the mold reaches the set temperature, install the blank on the mold, add a pressing plate and a stop hole on the top of the mold, connect and lock the pressing plate, the blank and the mold through bolts to prevent the blank from moving during spinning; S4 blank heating: after the installation of the blank is completed, the spinning machine is started, the main shaft is rotated at a low speed of 5-10 r / min, the blank is heated to 700-800 DEG C by using an induction heating system, the temperature of the deformation zone is controlled in real time by a dynamic temperature compensation system composed of a temperature measuring device and a heat supplementing device, the dynamic temperature compensation system specifically comprises: a double-wavelength infrared thermal imager is used to scan the temperature distribution of the deformation zone in real time, the temperature measuring frequency is greater than or equal to 100 Hz; the heat supplementing device is distributed along the axial direction of the blank with 3-5 independent heating units, the power of each unit is 5-10 kW, the heating power is dynamically adjusted according to the temperature feedback signal by using a PID control algorithm, the proportional coefficient Kp in the PID control algorithm is 0.8, the integral coefficient Ki is 0.3, and the differential coefficient Kd is 0.1; at the same time, based on a material temperature drop model the heat loss is predicted, wherein T0 is the target temperature, Q is the heat loss per unit time, m is the mass of the blank, c is the specific heat capacity of the material, the temperature fluctuation in the heating stage is less than or equal to ± 5 DEG C, and the temperature fluctuation in the spinning stage is less than or equal to ± 3 DEG C; the heat supplementing device and the temperature measuring device are linked, the heating power can be automatically adjusted according to the temperature information fed back by the temperature measuring device, and the temperature of the deformation zone can be accurately controlled; S5 separation at the cutting point: when the deformation zone temperature reaches the set temperature, start the spinning equipment and separate the spinning cutting point blank by spinning separation; the spinning roller has an R angle of R1, and the value of R1 is in the range of 8-12 mm; when the spinning roller is rotated to the predetermined position, the contour of the spinning roller is consistent with the profile of the non-separated part of the spinning part to a degree of ≥98%, and the profile error is ≤±0.05 mm; the spinning roller has the functions of separation and forming; the separation part is provided with a forming support disc, the separation guide surface of the forming support disc and the R angle of the spinning roller form a material flow guide angle of 15°-20°, so that the material produces directional plastic flow along the profile of the spinning roller during separation, forming a separation interface with a roughness of Ra≤1.2μm; the cooperative action of the spinning roller and the forming support disc ensures that the angle between the resultant force direction of the separation force and the forming force and the normal line of the target curved generatrix is ≤5°, thereby ensuring the pre-forming precision of the non-separated area; S6 local spinning: after separation, remove the forming support disc used during separation; install a split forming support disc, start the spinning machine and maintain the deformation zone temperature at 700-800℃ through a heat supplement device to perform multi-pass spinning forming; the process parameters of the multi-pass spinning are as follows: pass number 3-5 passes, first-pass thinning rate 15%-20%, subsequent pass thinning rate decreasing by 5%-8%; spinning roller feed speed 0.5-1.5mm / r, final pass feed speed reduced by 30%-40% to improve surface quality; spinning ratio controlled at 2.5-4.0 to avoid material cracking caused by excessive deformation; the split forming support disc is fixed on the mold through bolts for easy disassembly after spinning; S7: after spinning is completed, replace the turning tool to perform turning processing on the spinning part; when the spinning part naturally cools to 50-60℃, disassemble it and detect the matching degree of the outer contour and the theoretical contour through three-dimensional scanning.

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