An endogenous hot spinning die based on electromagnetic induction effect and a forming method

Abstract

The application belongs to the technical field of hot spinning, and particularly relates to an endogenous hot spinning die based on electromagnetic induction effect and a forming method. The endogenous hot spinning die based on electromagnetic induction effect comprises a core die, an electromagnetic induction assembly coaxially fixed in the core die and located in the inside of an applied magnetic field to generate heat through electromagnetic induction, a material stripping part movably arranged on the outside of the core die and used for stripping the workpiece on the core die, a top cover fixed at the top end of the core die, and a mounting part fixed at the bottom end of the core die and used for being fixed with a spinning machine spindle. The application further provides a forming method of the endogenous hot spinning die based on electromagnetic induction effect, which comprises the following steps: fixing the core die with the output shaft of the spinning machine; mounting a blank on the outside of the core die; applying an external magnetic field; rotating the core die, and the electromagnetic induction assembly generates electromagnetic induction heat to simultaneously heat the inside and outside of the blank, so that the heat of the inside and outside of the blank is uniform; removing the external magnetic field, and after the core die stops rotating, stripping is performed through the material stripping part.

Description

Technical Field

[0001] This invention belongs to the field of hot spinning technology, and particularly relates to an endogenous hot spinning mold and forming method based on electromagnetic induction effect. Background Technology

[0002] In traditional spinning processes, workpieces often need to be heated to reduce material deformation resistance and increase elongation. Common methods include flame heating of the billet surface or induction heating. Flame heating only heats the outer side of the billet, transferring heat from the outside to the inside. The limited heating area leads to uneven heating, and in thicker workpieces, this results in a significant temperature difference between the inside and outside, with the outer layer being hotter than the inner layer. This leads to poor plastic deformation capacity on the inner side of the billet, while the outer layer, in contact with the spinning wheel, has better plastic deformation capacity, significantly increasing the uneven deformation between the inner and outer layers. This is especially true when spinning double-layer metal or parts with internal ribs; if the inner layer has poor plastic deformation capacity, it will significantly reduce the workpiece forming quality and place high demands on the equipment. Furthermore, surface flame heating is inefficient and wastes energy. Induction heating, on the other hand, significantly affects equipment components outside the billet, requires high-quality equipment materials, and is difficult to implement online heating during the forming process.

[0003] In view of the shortcomings of the above heating methods, we propose an endogenous heat spinning die and forming method based on electromagnetic induction effect. Combined with traditional heating methods, it can achieve uniform heat inside and outside the blank and improve the forming quality. Summary of the Invention

[0004] The purpose of this invention is to provide an endogenous thermal spinning die and forming method based on electromagnetic induction effect to solve the above-mentioned problems.

[0005] To achieve the above objectives, the present invention provides the following solution:

[0006] An endogenous thermal spinning die based on electromagnetic induction effect, comprising:

[0007] Core mold;

[0008] The electromagnetic induction component is coaxially fixed inside the core mold and located inside the applied magnetic field, generating heat through electromagnetic induction.

[0009] The ejection section is movably disposed on the outside of the core mold and is used to demold the workpiece on the core mold;

[0010] The top cover is fixed to the top of the core mold;

[0011] The mounting part is fixed to the bottom end of the core mold and is used to fix it to the spindle of the spinning machine.

[0012] In use, the mandrel is first fixed to the output shaft of the spinning machine via the mounting part, and then the blank is installed on the outside of the mandrel; the external magnetic field is applied to the outside of the mandrel; after the mandrel is rotated by the output shaft of the spinning machine, the electromagnetic induction component located inside the mandrel rotates in the external magnetic field and generates heat under the action of electromagnetic induction. This heat heats the inside of the blank and the outside of the blank at the same time, so that the heat inside and outside of the blank is uniform; after processing is completed, the external magnetic field is removed, the mandrel stops rotating, and the blank is demolded through the ejector part.

[0013] Preferably, the external magnetic field can be provided by a permanent magnet, electromagnet, or eddy current device to form a controllable magnetic field in the heating area.

[0014] During the operation of the spinning machine, the electromagnetic induction component within the mandrel rotates at high speed in the magnetic field. Due to electromagnetic induction, an induced current is generated within the component, which in turn generates heat, heating the workpiece from the inside. Combined with conventional flame heating, this allows the inner and outer layers of the workpiece to reach the spinning temperature in a short time, eliminating the temperature gradient between the inner and outer layers, significantly reducing energy consumption and increasing product competitiveness.

[0015] The core mold's main functions include conducting heat from the heating coil and supporting the workpiece to be processed; it also serves as a forming mold for processing the workpiece.

[0016] Preferably, the core mold is a hollow cylindrical or tubular structure, and the surface of the core mold can be smooth or processed with longitudinal, circumferential, or intersecting grooves, among others.

[0017] Preferably, the electromagnetic induction component includes a fixed shaft, which is coaxially disposed inside the core mold. The top end of the fixed shaft is axially connected to the bottom end of the top cover, and the bottom end of the fixed shaft is fixedly connected to the inner wall of the bottom of the core mold.

[0018] The fixed shaft is provided with a plurality of electromagnetic induction units, which are spaced apart along the height direction of the fixed shaft.

[0019] The fixed shaft is located at the axis of the core mold, with one end connected to the core mold and the other end connected to the top cover. During the spinning process, the core mold rotates, causing the fixed shaft to rotate, so that several sets of electromagnetic induction parts on the fixed shaft rotate synchronously.

[0020] The fixed shaft is made of materials including but not limited to metal, ceramic or polymer, and has good high temperature resistance.

[0021] The connection between the top cover and the fixed shaft includes, but is not limited to, threaded, pin, or keyed connections.

[0022] The connection between the top cover and the core mold includes, but is not limited to, threaded, pin, or keyed connections.

[0023] The top cover, the fixed shaft, and the core mold constitute the main body of the spinning die and reduce heat loss in the core mold cavity environment.

[0024] Preferably, the distance between two adjacent sets of electromagnetic induction units is equal.

[0025] Preferably, the electromagnetic induction unit includes a plurality of heating coils, which are circumferentially and equally spaced together and fixed on the fixed shaft.

[0026] The number of turns and quantity of the heating coil can be adjusted according to actual needs, and the heating coils in different groups are independent of each other. The structure of the heating coil includes, but is not limited to, rectangular and square shapes, and the connection method between the heating coil and the fixed shaft includes, but is not limited to, welding, hinge, and the use of connecting fasteners.

[0027] Preferably, the heating coil has 100-800 turns.

[0028] Preferably, the ejection section includes an ejection ring, which is vertically slidably disposed on the outside of the core mold.

[0029] Preferably, the mounting part includes a flange, which is fixedly connected to the bottom end of the mandrel and to the output shaft of the spinning machine.

[0030] Preferably, the applied magnetic field strength ranges from 0.5 to 2T, and the core mold rotation speed is 50 to 500 rpm.

[0031] Preferably, the number of electromagnetic induction units, the number of heating coils, the area of ​​the heating coils, the number of turns of the heating coils, the rotational speed of the core mold, and the strength of the applied magnetic field must satisfy the formula.

[0032]

[0033] Wherein, the heat generated Q is in joules; the applied magnetic field strength B is in tesla; the heating coil area A is in square meters; the core mold rotation speed n is in revolutions per minute; the running time t is in seconds; the heating coil resistance R is in ohms; the number of heating coil turns N is in turns; and the number of electromagnetic induction units m is in units.

[0034] A forming method for an endogenous hot spinning die based on electromagnetic induction effect, comprising the following steps:

[0035] S1. The core mold is fixedly connected to the output shaft of the spinning machine via the mounting part;

[0036] S2. Install the blank on the outside of the core mold;

[0037] S3. Apply the external magnetic field;

[0038] S4. The core mold is rotated by the output shaft of the spinning machine. The electromagnetic induction component rotates in the external magnetic field to generate electromagnetic induction heat, which heats the inside of the billet and heats the outside of the billet at the same time, so that the heat inside and outside of the billet is uniform.

[0039] S5. After the external magnetic field is removed and the core mold stops rotating, the core mold is demolded through the ejection section.

[0040] Compared with the prior art, the present invention has the following advantages and technical effects:

[0041] In use, the mandrel is first fixed to the output shaft of the spinning machine via the mounting part, and then the blank is installed on the outside of the mandrel. An external magnetic field is applied to the outside of the mandrel. After the mandrel rotates through the output shaft of the spinning machine, the electromagnetic induction component located inside the mandrel rotates within the external magnetic field and generates heat under electromagnetic induction. This heat heats the inside and outside of the blank simultaneously, ensuring uniform heat distribution throughout the blank. After processing, the external magnetic field is removed, the mandrel stops rotating, and the blank is demolded via the ejection part. In this invention, the electromagnetic induction component utilizes its own rotational motion during spinning to cut magnetic lines of force and generate heat, resulting in low energy consumption and effectively reducing production costs. The heat generated by the electromagnetic induction component is used to heat the spun workpiece, which is beneficial for uniform heating of the inner and outer layers and rapid heating of the workpiece. When combined with conventional heating methods, it can effectively solve the problems of large temperature gradients between the inner and outer layers and difficulty in forming inner metal ribs during double-layer metal spinning or tube blank spinning. By confirming the specific design parameters of the electromagnetic induction component according to actual production needs, the heat generation can be adjusted. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly described below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0043] Figure 1 This is a schematic diagram of the structure of the present invention;

[0044] Figure 2 This is a bottom view of the structural diagram of the present invention;

[0045] Figure 3 This is a schematic diagram of the electromagnetic induction component structure of the present invention;

[0046] The components include: 1. Heating coil; 2. Fixed shaft; 3. Core mold; 4. Unloading ring; 5. Flange; and 6. Top cover. Detailed Implementation

[0047] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0048] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0049] Reference Figures 1 to 3 This invention discloses an endogenous hot spinning die based on electromagnetic induction effect, comprising:

[0050] Core mold 3;

[0051] The electromagnetic induction component is coaxially fixed inside the core mold 3 and located inside the external magnetic field, generating heat through electromagnetic induction.

[0052] The ejection section is movably located on the outside of the core mold 3 and is used to demold the workpiece on the core mold 3;

[0053] The top cover 6 is fixed to the top of the core mold 3;

[0054] The mounting part is fixed to the bottom end of the core mold 3 and is used to fix it to the spindle of the spinning machine.

[0055] In use, the core mold 3 is first fixed to the output shaft of the spinning machine through the mounting part, and then the blank is installed on the outside of the core mold 3. An external magnetic field is applied to the outside of the core mold 3. After the core mold 3 is rotated by the output shaft of the spinning machine, the electromagnetic induction component located inside the core mold 3 rotates in the external magnetic field and generates heat under the action of electromagnetic induction. This heat heats the inside of the blank and heats the outside of the blank at the same time, so that the heat inside and outside of the blank is uniform. After the processing is completed, the external magnetic field is removed, and after the core mold 3 stops rotating, the blank is demolded through the ejection part.

[0056] In this invention, the electromagnetic induction component utilizes its own rotational motion during the spinning process to cut magnetic field lines and generate heat, resulting in low energy consumption and effectively reducing production costs.

[0057] The heat generated by the electromagnetic induction component is used to heat the spun workpiece, which is beneficial to the uniform heating of the inner and outer layers of the spun workpiece and the rapid heating of the workpiece. When combined with conventional heating methods, it can effectively solve the problems of large temperature gradient between the inner and outer layers and difficulty in forming the inner metal ribs when spinning double-layer metal or tube blanks.

[0058] By confirming the specific design parameters of the electromagnetic induction component based on actual production needs, the purpose of adjusting the heat generation can be achieved.

[0059] Furthermore, the external magnetic field can be provided using permanent magnets, electromagnets, or eddy current devices to form a controllable magnetic field in the heating area. During the spinning machine's operation, the electromagnetic induction component within the mandrel 3 rotates at high speed in the magnetic field. Due to electromagnetic induction, an induced current is generated within the component, which in turn generates heat, heating the workpiece from the inside. Combined with conventional flame heating, this allows the inner and outer layers of the workpiece to reach the spinning temperature in a short time, eliminating the temperature gradient between the inner and outer layers, significantly reducing energy consumption and increasing product competitiveness. This method is particularly suitable for spinning double-layer metal sheets or tube blanks where the inner metal layer is harder than the outer metal layer, or for spinning tubes or cylindrical parts with internal ribs.

[0060] The core mold 3 mainly functions to conduct heat from the heating coil and support the workpiece to be processed, and also serves as a forming mold for processing the workpiece.

[0061] Furthermore, the core mold 3 is a hollow cylindrical or tubular structure, and the surface of the core mold 3 can be smooth or processed with longitudinal, circumferential, or intersecting grooves, among others.

[0062] The scheme is further optimized. The electromagnetic induction component includes a fixed shaft 2, which is coaxially arranged inside the core mold 3. The top end of the fixed shaft 2 is axially connected to the bottom end of the top cover 6, and the bottom end of the fixed shaft 2 is fixedly connected to the bottom inner wall of the core mold 3.

[0063] The fixed shaft 2 is provided with several sets of electromagnetic induction units, which are spaced apart along the height direction of the fixed shaft 2.

[0064] The fixed shaft 2 is located on the axis of the core mold 3. One end is connected to the core mold 3 and the other end is connected to the top cover 6. During the spinning process, the core mold 3 rotates, which drives the fixed shaft 2 to rotate, causing several sets of electromagnetic induction parts on the fixed shaft 2 to rotate synchronously.

[0065] The fixed shaft 2 is made of materials including but not limited to metal, ceramic or polymer.

[0066] The connection between the top cover 6 and the fixed shaft 2 includes, but is not limited to, threaded, pin, or keyed connections. The connection between the top cover 6 and the core mold 3 includes, but is not limited to, threaded, pin, or keyed connections.

[0067] The top cover 6, the fixed shaft 2, and the core mold 3 constitute the main body of the spinning die and reduce heat loss in the core mold cavity environment.

[0068] The scheme was further optimized so that the distance between two adjacent sets of electromagnetic induction units is equal.

[0069] The scheme is further optimized so that the electromagnetic induction unit includes a plurality of heating coils 1, which are fixedly connected to the fixed shaft 2 at equal intervals around the circumference.

[0070] The number of turns and quantity of heating coil 1 can be adjusted according to actual needs, and different groups of heating coil 1 are independent of each other. The structure of heating coil 1 includes, but is not limited to, rectangular and square shapes, and the connection methods between heating coil 1 and fixed shaft 2 include, but are not limited to, welding, hinge, and the use of connecting fasteners.

[0071] The design was further optimized so that the number of turns of heating coil 1 was 100-800.

[0072] The design is further optimized so that the ejection section includes an ejection ring 4, which is vertically slidably disposed on the outside of the core mold 3.

[0073] The ejector ring 4 is located at the bottom of the core mold 3. After spinning is completed, the ejector ring 4 is used to demold the workpiece on the core mold 3.

[0074] The design was further optimized. The installation part includes flange 5, which is fixedly connected to the bottom end of mandrel 3 and to the output shaft of spinning machine.

[0075] Flange 5 is used to fix the mandrel 3 on the spindle of the spinning machine. The flange 5 is fixedly connected to the spindle of the spinning machine. The connection between the flange 5 and the mandrel 3 includes, but is not limited to, key, pin or threaded connection.

[0076] The scheme was further optimized, with the external magnetic field strength ranging from 0.5 to 2T and the core mold 3 rotating at a speed of 50 to 500 rpm.

[0077] Further optimization of the scheme requires that the number of electromagnetic induction units, the number of heating coils 1, the area of ​​heating coil 1, the number of turns of heating coil 1, the rotational speed of core mold 3, and the strength of the external magnetic field satisfy the following formula:

[0078]

[0079] Wherein, the heat generated Q is in joules (J); the applied magnetic field strength B is in tesla (T); and the area of ​​the heating coil 1 A is in square meters (m²). 2 The rotational speed n of the core mold 3 is revolutions per minute (rpm); the running time t is seconds (s); the resistance R of the heating coil 1 is ohms (Ω); the number of turns N of the heating coil 1 is turns; and the number of electromagnetic induction units m is units.

[0080] The specifications and number of heating coils 1 are adjusted according to the size, material and heating temperature of the workpiece to be processed. The rotation speed range is 50-500 rpm, the magnetic field strength range is 0.5-2T, and the number of coil turns ranges from 100-800. After the workpiece is set up, the spindle of the spinning machine is started to rotate, which will drive the heating coil to rotate. Heat is generated and accumulated during the spinning process to heat the blank.

[0081] For example, the external magnetic field is provided by an electromagnet, and the magnetic field lines are perpendicular to the axis of the fixed shaft 2. The mold is completely situated in the uniform magnetic field provided by the electromagnet.

[0082] For example, the heating coil 1 is a copper rectangular coil with a specification of 50mm×20mm, preferably with 300 turns, and preferably with 4 groups of electromagnetic induction parts, each group of electromagnetic induction parts containing 8 heating coils 1.

[0083] Using four sets of electromagnetic induction units provides a larger heating range compared to using fewer sets of heating coils. The eight heating coils 1 in each group are arranged circumferentially symmetrically, with the axes of adjacent heating coils 1 within the same group forming a 45° angle. This angled arrangement reduces the rotational inertia of the fixed shaft 2 during rotation, preventing vibration and extending the device's lifespan, while also ensuring uniform heat generation. When the heating coil 1 rotates within the magnetic field of this region, it cuts magnetic field lines, thereby generating an induced current within the heating coil 1. In practical applications, the number of sets, the number of coils in the same group, and the angle of arrangement of the heating coils 1 can be flexibly selected according to actual needs.

[0084] After the heating coil 1 is installed, the distance from the axisymmetric center of the heating coil 1 in the same group to the surface of the fixed shaft 2 should be consistent, and the positions of the heating coil 1 in different groups on the longitudinal direction of the fixed shaft 2 should also be consistent. In addition to ensuring that the installation position of the heating coil 1 is consistent, it is also necessary to ensure that each heating coil 1 is exactly the same in shape and size, and the connection between the heating coil 1 and the fixed shaft 2 is achieved by using fasteners.

[0085] The fixed shaft 2 is made of high-temperature and pressure resistant materials such as metal, ceramic, and polymer. Threads are machined at both ends of the fixed shaft 2, one end for fixing the top cover 6, and the other end for fixing the fixed shaft 2 to the core mold 3.

[0086] The inner wall of the core mold 3 forms a heating zone, and the spun workpiece to be heated is placed on the outer wall of the core mold 3. During heating, heat is generated by the heating coil 1 and conducted to the inner layer of the spun workpiece through the core mold 3. At the same time, the core mold 3 also serves as the forming mold for the workpiece.

[0087] The tail of the core mold 3 is threaded to connect with the flange 5, and the tightening direction is opposite to the rotation direction of the spinning machine spindle to prevent relative loosening of the device due to the rotation of the spindle during spinning. The core mold 3 is a common cylindrical mold. After spinning, the workpiece on the core mold 3 is demolded using the ejector ring 4.

[0088] The flange 5 is fixedly connected to the spinning machine via a threaded hole. During operation, the flange 5 is driven by the motor of the spinning machine. The flange 5 drives the fixed shaft 2 and the mandrel 3 to rotate. At the same time, since the heating coil 1 is installed on the fixed shaft 2, it will drive the heating coil 1 to rotate during operation, which will cause the heating coil 1 to rotate and cut the magnetic field lines to generate induced current and heat. The heat is then transferred to the workpiece through the mandrel 3 for internal heating.

[0089] The flange 5 has a threaded hole in the middle, and the core mold 3 is connected to the threaded hole of the flange 5 through its lower end thread. The flange 5 has a threaded hole at the bottom, and the flange 5 is connected to the spinning machine by bolts.

[0090] The top cover 6 is connected to the fixed shaft 2 by a threaded connection, and is also connected to the core mold 3 of the spinning die by screws, thereby achieving the connection and fixation of the core mold 3 and the fixed shaft 2.

[0091] The workpiece blank to be heated is a cylindrical stainless steel spun workpiece with an inner diameter of 60mm, a wall thickness of 2.5mm, and a length of 200mm.

[0092] According to the heat formula

[0093]

[0094] It can be calculated that, under theoretical conditions, the device is equipped with four sets of heating coils 1, each with a specification of 50mm × 20mm and 300 turns, an external magnetic field strength of 0.8T, and a spindle speed of 360 revolutions per minute. Under these conditions, the device can heat a cylindrical stainless steel spinning workpiece with an inner diameter of 60mm, a wall thickness of 2.5mm, and a length of 105mm from room temperature to a spinning temperature of 600 degrees Celsius within 10 minutes.

[0095] In actual production, the specific parameter settings of this device can be obtained by estimating the expected heat and adjusting the number of electromagnetic induction units, the number of heating coils 1, the area of ​​heating coils 1, the number of turns of heating coils 1, the rotation speed of core mold 3, and the strength of the external magnetic field according to the formula based on the actual working conditions.

[0096] This heating method also incorporates conventional flame heating to accelerate the process of the inner and outer layers of the workpiece reaching the spinning temperature and eliminate the temperature gradient between the inner and outer layers, while preventing the heat generated inside the heating coil 1 from being lost.

[0097] A forming method for an endogenous hot spinning die based on electromagnetic induction effect, comprising the following steps:

[0098] S1. Fix the core mold 3 to the output shaft of the spinning machine through the mounting part;

[0099] S2. Install the blank on the outside of the core mold 3;

[0100] S3. Apply an external magnetic field;

[0101] S4. The core mold 3 is rotated by the output shaft of the spinning machine. The electromagnetic induction component rotates in the external magnetic field to generate electromagnetic induction heat, which heats the inside of the billet and heats the outside of the billet at the same time, so that the heat inside and outside of the billet is uniform.

[0102] S5. After the external magnetic field is removed and the core mold 3 stops rotating, the core mold is demolded through the ejection section.

[0103] The working process of this invention is as follows:

[0104] S1. Fix the core mold 3 to the output shaft of the spinning machine via flange 5;

[0105] S2. Install the blank on the outside of the core mold 3;

[0106] S3. Apply an external magnetic field;

[0107] S4. The core mold 3 is rotated by the output shaft of the spinning machine, which drives the fixed shaft 2 and multiple heating coils 1 on the fixed shaft 2 to rotate in the external magnetic field to generate electromagnetic induction heat, which heats the inside of the billet and heats the outside of the billet at the same time, so that the heat inside and outside of the billet is uniform.

[0108] S5. After the external magnetic field is removed and the core mold 3 stops rotating, demolding is performed through the ejector ring 4.

[0109] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0110] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. An endogenous thermal spinning die based on electromagnetic induction effect, characterized in that, include: Core mold (3); The electromagnetic induction component is coaxially fixed inside the core mold (3) and located inside the external magnetic field, generating heat through electromagnetic induction; The ejection section is movably disposed on the outside of the core mold (3) and is used to demold the workpiece on the core mold (3); The top cover (6) is fixed to the top of the core mold (3); The mounting part is fixed to the bottom end of the core mold (3) for fixing to the output shaft of the spinning machine; The electromagnetic induction component includes a fixed shaft (2), which is coaxially disposed inside the core mold (3). The top end of the fixed shaft (2) is axially connected to the bottom end of the top cover (6), and the bottom end of the fixed shaft (2) is fixedly connected to the bottom inner wall of the core mold (3). The fixed shaft (2) is provided with a plurality of electromagnetic induction units, and the plurality of electromagnetic induction units are spaced apart along the height direction of the fixed shaft (2); the electromagnetic induction units include a plurality of heating coils (1), and the plurality of heating coils (1) are fixedly connected to the fixed shaft (2) at equal intervals in the circumferential direction.

2. The endogenous thermal spinning die based on electromagnetic induction effect according to claim 1, characterized in that: The distance between two adjacent sets of electromagnetic induction units is equal.

3. The endogenous thermal spinning die based on electromagnetic induction effect according to claim 1, characterized in that: The heating coil (1) has 100-800 turns.

4. The endogenous thermal spinning die based on electromagnetic induction effect according to claim 1, characterized in that: The ejection section includes an ejection ring (4), which is vertically slidably disposed on the outside of the core mold (3).

5. The endogenous thermal spinning die based on electromagnetic induction effect according to claim 1, characterized in that: The mounting part includes a flange (5), which is fixedly connected to the bottom end of the core mold (3) and to the output shaft of the spinning machine.

6. The endogenous thermal spinning die based on electromagnetic induction effect according to claim 1, characterized in that: The applied magnetic field strength ranges from 0.5 to 2T, and the core mold (3) rotates at a speed of 50 to 500 rpm.

7. A forming method for an endogenous hot spinning die based on electromagnetic induction effect, wherein the endogenous hot spinning die based on electromagnetic induction effect according to any one of claims 1-6 is characterized in that, Includes the following steps: S1. The core mold (3) is fixedly connected to the output shaft of the spinning machine through the mounting part; S2. Install the blank on the outside of the core mold (3); S3. Apply the external magnetic field; S4. The core mold (3) is rotated by the output shaft of the spinning machine. The electromagnetic induction component rotates in the external magnetic field to generate electromagnetic induction heat, which heats the inside of the billet and heats the outside of the billet at the same time, so that the heat inside and outside of the billet is uniform. S5. After the external magnetic field is removed and the core mold (3) stops rotating, it is demolded through the ejection section.

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