An elastic core mold assembly based on servo cylinder driving

Abstract

Provided is an elastic core mold assembly driven by servo cylinders, which comprises a core mold fixing seat and an elastic core mold that are fixed and connected in a modular concentric manner; a plurality of micro servo cylinders are uniformly distributed and fixed on the lower conical surface I of the core mold fixing seat; the plurality of servo cylinders perform synchronous adjustment actions; and the servo cylinders perform the end abutting action on the lower conical surface II of the elastic core mold to deform the mouth edge of the elastic core mold to realize core mold reshaping. The utility model realizes the fast, high-precision, online dynamic reshaping adjustment of the elastic core mold without waves, has a compact structure, is economical and practical, and is suitable for promotion.

Description

Technical Field

[0001] This utility model belongs to the field of processing technology for plastics used in transportation, and specifically relates to an elastic core mold assembly based on servo electric cylinder drive. Background Technology

[0002] In the production of hollow plastic containers, molten plastic is plasticized by an extruder and then enters the die head. The die and core mold at the die head outlet work together to extrude the molten plastic into a preform of suitable wall thickness. The preform is then blown in a mold to form the finished product. Since the preform expands to form different parts of the product, the stretching of different parts of the preform is also different. Therefore, it is necessary to dynamically adjust the gap between the core mold assembly and the die assembly.

[0003] In the existing technology, the radial wall thickness adjustment device for a blow molding machine disclosed in CN117621407A uses an adjusting screw for adjustment. Therefore, during the production process, the thickness of the same circumferential cross-section cannot be adjusted online, dynamically, and in a timely manner during preform injection. Even if the machine is stopped for adjustment, there is still a problem of a "wavy" distribution of local thickness on the same cross-section, which is "thin-thick-thin-thick...". Moreover, this "wavy" thickness difference cannot be solved by core mold modification or die modification.

[0004] In the existing technology, CN102145540B discloses a die mechanism for a plastic blow molding machine, which uses a servo motor and a reducer to adjust the gap between the die assembly and the core mold assembly. However, this adjustment method amplifies the rotational inertia of the load end by the reducer. If the inertia ratio is too large, the servo motor needs a larger torque to achieve rapid start and stop, resulting in slow system response. For example, in high-speed blow molding machines, wall thickness adjustment needs to be completed within milliseconds, and the reducer may become a bottleneck. Furthermore, the combination of servo motor and reducer requires additional design of couplings, mounting brackets, and other components, increasing the complexity of the mechanical structure. In space-constrained situations, such as inside the core mold of a micro injection molding machine, it may not be possible to install it. In addition, the reducer usually requires a certain axial length, which may force an increase in the overall size of the equipment, affecting the compact design. During maintenance, the reducer needs to have its lubricating oil changed regularly and its sealing checked; otherwise, oil leakage can easily lead to gear wear or contamination of the production environment. After the reducer gears wear out, the entire reducer needs to be replaced, resulting in excessively high spare parts costs. Furthermore, the transmission efficiency of reducers is typically 85%-95%, and energy loss is released as heat, requiring additional heat dissipation design. In the high-temperature environment of injection molding, the reducer lubricating oil may deteriorate due to high temperatures, leading to gear seizure or abnormal wear. Therefore, given the less-than-ideal response speed, complex structure, large space occupation, high maintenance costs, and poor environmental adaptability of the combination of servo motor and reducer, it is not suitable for achieving dynamic online adjustment of elastic mandrels. To address this, the following improved technical solution is proposed. Utility Model Content

[0005] The technical problem solved by this utility model is to provide an elastic mandrel assembly based on servo electric cylinder drive, which solves the problem of how to achieve wave-free, fast, high-precision, compact, economical and practical online dynamic adjustment of the elastic mandrel.

[0006] The technical solution adopted by this utility model is as follows: an elastic core mold assembly based on servo electric cylinder drive. The elastic core mold assembly includes a core mold fixing seat and an elastic core mold that are modularly concentrically positioned and fixed together. Several micro servo electric cylinders are evenly distributed and fixedly installed on the lower conical surface I of the core mold fixing seat. The several servo electric cylinders perform adjustment actions synchronously, and the end of the servo electric cylinder presses against the lower conical surface II of the elastic core mold to deform the edge of the elastic core mold and realize the core mold shaping.

[0007] In the above technical solution, further: the lower conical surface I of the core mold fixing seat is evenly distributed with several threaded holes, and the servo electric cylinder is fixedly installed by screwing the threaded holes with a screw interface.

[0008] The above technical solution further includes a locking nut, which is screwed to fit the screw interface of the servo cylinder and is pressed against the lower conical surface I of the core mold fixing seat to prevent the servo cylinder from loosening.

[0009] In the above technical solution, further: the installation spacing of the servo electric cylinder is less than 50mm; the servo electric cylinder is a high-temperature resistant servo electric cylinder.

[0010] In the above technical solution, the elastic core mold is further fixedly installed on the core mold fixing seat by screw I, and the core mold fixing seat is fixedly connected to the mold head by screw II.

[0011] In the above technical solution, further: a positioning boss I is formed on the inner side of the elastic core mold 1, and a positioning boss II is formed on the top of the outer side of the core mold fixing seat. The positioning boss I and the positioning boss II are concentrically positioned and adapted to each other, thereby concentrically positioning the elastic core mold and the core mold fixing seat.

[0012] In the above technical solution, the preferred embodiment is that the lower conical surface II of the elastic core mold has a thin-walled structure, and the elastic core mold is made of high-temperature resistant alloy spring steel.

[0013] Advantages of this utility model compared to the prior art:

[0014] 1. This utility model of servo electric cylinder drive achieves a positioning accuracy of ±0.01mm and a thrust control accuracy of 1%; the speed adjustment range is 0.1~2m / s, supporting stepless speed regulation to adapt to different working conditions; the miniature servo electric cylinder saves installation space and meets the needs of small space installation; there is no risk of hydraulic oil leakage, no oil pollution, reducing maintenance costs and being more energy-efficient.

[0015] 2. The elastic core mold assembly based on servo electric cylinder drive of this utility model achieves high-precision and highly adaptable core mold shaping function through modular design, synchronous control of 16 micro servo electric cylinders and elastic core mold deformation mechanism.

[0016] 3. The lower conical surface I of the core mold fixing seat of this utility model adopts a screw-in installation method with threaded holes and servo electric cylinder screw interfaces. Through structural optimization, improved installation efficiency, enhanced reliability, and improved environmental adaptability, the overall performance of the system is significantly improved; the installation height is reduced by 30%-50%, enabling "blind installation" operation, facilitating quick disassembly and replacement, reducing costs by 15%-20%, and annual maintenance costs by 40%-50%; the structure is lightweight, and energy consumption is reduced by 10%-15%.

[0017] 4. The installation spacing of the servo electric cylinder in this utility model is reduced to less than 50mm and a high-temperature resistant servo electric cylinder is used, which can significantly improve the shaping accuracy, response speed and environmental adaptability of the system, especially suitable for high temperature and high density driving scenarios; it can more accurately correct the local deformation of the core mold, eliminate the "stress depression" phenomenon, ensure uniform transmission of shaping force, reduce phase delay by 70%, reduce the equivalent rotational inertia of the system by 30%, and shorten the shaping action response time to 30ms.

[0018] 5. The elastic core mold assembly of this utility model uses screw I and screw II to achieve modular connection and fixation, which is reliable, easy to maintain and has excellent adaptability. It is especially suitable for industrial scenarios with high temperature and high pressure, high precision shaping or rapid mold change. It has a long fatigue life and low maintenance cost.

[0019] 6. The concentric positioning of the inner positioning boss I of the elastic core mold and the outer positioning boss II of the core mold fixing seat in this utility model ensures high positioning mechanical precision, stable and reliable positioning at high temperatures, high manufacturing efficiency, long service life, standardized interface and quick mold change, reducing manufacturing costs and improving production flexibility.

[0020] 7. The lower conical surface II of the elastic core mold of this utility model has a thin-walled structure and is made of high-temperature resistant alloy spring steel, which improves the high-temperature resistance and elastic stability of the elastic core mold, realizes lightweight design, improves fatigue strength, and facilitates processing. Attached Figure Description

[0021] Figure 1 This is a longitudinal section sectional view of the present invention;

[0022] Figure 2 This is a bottom-view perspective view of the present invention;

[0023] In the diagram: 1-elastic core mold, 2-screw II, 3-core mold fixing seat, 4-screw I, 5-servo electric cylinder, 6-locking nut. Detailed Implementation

[0024] The following will be combined with the appendix of this utility model. Figure 1-2 The embodiments described herein provide a clear and complete explanation of the technical solutions in the embodiments of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0025] (like Figure 1 , Figure 2 As shown, an elastic core mold assembly based on servo electric cylinder drive is provided. The elastic core mold assembly includes a core mold fixing seat 3 and an elastic core mold 1, which are modularly concentrically positioned and fixed together. Sixteen miniature servo electric cylinders 5 are evenly distributed and fixed on the lower conical surface I of the core mold fixing seat 3. The 16 servo electric cylinders 5 perform adjustment actions synchronously, and the end of the servo electric cylinder 5 presses against the lower conical surface II of the elastic core mold 1 to deform the edge of the elastic core mold 1 and achieve core mold shaping.

[0026] It should be noted that the servo electric cylinder 5 has a built-in encoder or sensor that provides real-time feedback on position and speed information. Combined with a PID control algorithm, it achieves a positioning accuracy of ±0.01mm and a thrust control accuracy of 1%. The servo electric cylinder 5 has an adjustable speed range of 0.1~2m / s and supports stepless speed regulation to adapt to different working conditions. The HE32 series miniature servo electric cylinder 5 is only 44mm×44mm in size, providing more than 200N of thrust in a limited volume, saving installation space. Its rated life can reach 5000km, reducing frequent replacement costs. With IP65 or higher, it is dustproof and waterproof, suitable for harsh environments. There is no risk of hydraulic oil leakage or oil pollution, reducing maintenance costs; electric drive is more energy-efficient than pneumatic drive.

[0027] Furthermore, the elastic core mold assembly driven by servo electric cylinders 5 achieves high-precision and highly adaptable core mold shaping functions through modular design, synchronous control of 16 micro servo electric cylinders 5, and the deformation mechanism of the elastic core mold 1. The specific analysis is as follows: Modular concentric positioning design provides dual assurance for high-precision and rapid model changeover. The core mold fixing seat 3 and the elastic core mold 1 are rigidly connected through a modular concentric positioning structure, ensuring that their axes are completely coincident. This design eliminates the eccentricity error (typically ±0.1mm or more) in traditional core mold installation, providing a reference accuracy for subsequent shaping. The modular split design allows for rapid adaptation to various product models by replacing elastic core molds 1 of different specifications, without the need to readjust the positioning mechanism. The distributed drive of 16 micro servo electric cylinders 5 improves spatial resolution. The 16 servo electric cylinders are evenly distributed along the lower conical surface I, forming a dense drive point matrix. Each servo electric cylinder 5 independently controls the local deformation of the elastic core mold 1, theoretically achieving an infinite level of shaping accuracy. The 16 miniature servo cylinders 5 are synchronously controlled via real-time industrial buses such as EtherCAT or Profinet, achieving microsecond-level synchronization (synchronization error <50μs). Regarding dynamic compensation, each servo cylinder 5 incorporates force and displacement sensors to monitor the stress distribution of the elastic mandrel 1 in real time and feed it back to the control system, achieving closed-loop control. The contact design between the lower conical surface I and the lower conical surface II converts the axial force of each servo cylinder 5 into a radial component, amplifying the shaping range of the elastic mandrel 1. For example, when the stroke of the servo cylinder 5 is ±2mm, the radial deformation of the edge of the elastic mandrel 1 can reach ±5mm, meeting the shaping requirements.

[0028] In the above embodiments, further: the lower conical surface I of the core mold fixing seat 3 is evenly provided with a plurality of threaded holes, and the servo electric cylinder 5 is fixedly installed by screwing the threaded holes with a screw interface.

[0029] It should be noted that the LAF and LASF series servo cylinders 5 specifically adopt a screw interface design, with ball bearings pre-installed at the factory. Installation is completed by screwing the screw interface into the threaded hole. This pre-installed structure of the screw interface and ball bearings not only simplifies the installation process but also ensures compatibility with industrial equipment through standardized thread specifications. During installation, users simply align the screw interface of the servo cylinder 5 with the threaded hole of the target component and screw it in for a secure connection. The pre-installed ball bearing design effectively reduces rotational resistance and improves transmission efficiency. For applications requiring high-precision positioning, this installation structure can also achieve millimeter-level position correction through the fine-tuning function of the threaded fit. Besides the LAF and LASF series, some customized servo cylinders 5 may also adopt a similar screw interface solution. These products are usually designed according to specific user needs, and while retaining the standard screw interface structure, they may add anti-loosening devices or sealing structures to adapt to special working conditions such as high temperature and vibration. In the servo-electric cylinder-driven elastic core mold assembly, the lower conical surface I of the core mold fixing seat 3 adopts a screw-in installation method with a threaded hole and the screw interface of the servo-electric cylinder 5. Through structural optimization, improved installation efficiency, enhanced reliability, and improved environmental adaptability, the overall performance of the system is significantly improved.

[0030] In the above embodiment, it further includes a locking nut 6, which is screwed to fit the screw interface of the servo cylinder 5, and the locking nut 6 is pressed against the lower conical surface I of the core mold fixing seat 3 to prevent the servo cylinder 5 from loosening.

[0031] It should be noted that the threaded holes are directly machined onto the lower conical surface I of the mandrel fixing seat 3, eliminating the need for additional brackets or flanges. This reduces the axial installation height of the servo cylinder 5 by 30%-50%, and by eliminating intermediate components such as brackets, the total system mass is reduced by 20%-40%. With standardized threaded hole specifications, the servo cylinder 5 can be installed blindly, reducing the installation time for a single servo cylinder 5 from 5-8 minutes in the traditional method to less than 1 minute, significantly shortening changeover downtime. During threaded hole machining, the lower conical surface I of the mandrel fixing seat 3 and the threaded hole system are machined synchronously in a single setup using a CNC machine tool, ensuring that the angle error between the axis of all threaded holes and the generatrix of the lower conical surface I is <0.1°. After assembly, the axis of the servo cylinder 5 naturally converges at the center of the lower conical surface I, eliminating manual adjustment deviations and achieving a concentricity accuracy of ±0.05mm. The fine threads of the threaded holes have a self-locking feature, effectively preventing the servo cylinder 5 from loosening under high-frequency vibration conditions and avoiding attenuation of shaping accuracy. The preload of the servo cylinder 5 screw interface is precisely controlled by a torque wrench, ensuring a uniform distribution of contact pressure between the servo cylinder 5 and the lower conical surface I. The threaded connection allows for quick disassembly and replacement in case of a single servo cylinder 5 failure, reducing maintenance time from 2-3 hours in the traditional method to less than 30 minutes. Although the machining cost of threaded holes is 20%-30% higher than that of traditional mounting holes, eliminating components such as brackets reduces the material cost per unit by 15%-20%. Regarding maintenance costs, the reliability of the threaded mounting connection of the screw interface reduces annual maintenance costs by 40%-50%; in terms of energy consumption, the lightweight structure reduces the inertia of moving parts, resulting in a 10%-15% reduction in energy consumption.

[0032] In the above embodiments, the installation spacing of the servo electric cylinder 5 is less than 50mm; the servo electric cylinder 5 is a high-temperature resistant servo electric cylinder.

[0033] It should be noted that the high-temperature resistant servo cylinder 5 can be made of aluminum alloy cylinder barrel, Inconel 718 nickel-based alloy (temperature resistance >650℃) cylinder body, or special coatings such as ceramic coating to prevent component deformation or performance degradation caused by high temperatures. By compressing the installation spacing of the servo cylinder 5 to less than 50mm and using high-temperature resistant servo cylinder 5, the shaping accuracy, response speed, and environmental adaptability of the system can be significantly improved, especially suitable for high-temperature, high-density drive scenarios. After the spacing is reduced, the control area of ​​a single servo cylinder 5 is reduced by 60%-80%, which can more accurately correct local deformation of the mandrel. Through finite element analysis (FEA) verification, when the spacing of the servo cylinder 5 is compressed from 80mm to 40mm, the standard deviation of stress distribution on the mandrel surface is reduced by 45%, eliminating the "stress depression" phenomenon caused by excessive spacing in traditional solutions, and ensuring uniform transmission of shaping force. The reduction in installation spacing weakens the mechanical coupling effect between the servo cylinders 5, and the phase delay is reduced by 70%. After the servo electric cylinders 5 are densely arranged, the system's equivalent moment of inertia is reduced by 30%. Combined with a high-bandwidth servo driver (bandwidth > 1kHz), the response time of the shaping action can be shortened from 100ms to 30ms. In addition, a spiral air-cooling channel can be opened inside the cylinder body of the servo electric cylinder 5 to force convection cooling through compressed air (flow rate 5L / min).

[0034] In the above embodiments, the elastic core mold 1 is further fixedly mounted on the core mold fixing seat 3 by screw I4, and the core mold fixing seat 3 is fixedly connected to the mold head by screw II2.

[0035] It should be noted that in the elastic core mold system, the connection between the elastic core mold 1 and the core mold fixing seat 3 is achieved through screw I4, while the core mold fixing seat 3 is fixed to the mold head through screw II2. This double-screw connection design has significant technical advantages in terms of mechanical reliability, maintenance efficiency, and manufacturing adaptability, and is especially suitable for industrial scenarios involving high temperature and high pressure, high-precision shaping, or rapid mold change. Specifically, screw I4 acts directly on the edge or flange structure of the elastic core mold 1, and the preload can be precisely controlled (e.g., ±5% error) using a torque wrench, ensuring uniform pressure on the contact surface between the elastic core mold 1 and the core mold fixing seat 3 (usually designed to be 2-5MPa). Multiple screws I4 (usually 4-8) are symmetrically and evenly arranged to form a redundant structure that resists shear moment, preventing loosening of the connection. Screw II2 connects the core mold fixing seat 3 and the mold head as a single rigid body. Finite element analysis (FEA) verifies that under a mold closing force of 3000kN, the deformation of the core mold fixing seat 3 is <0.01mm, ensuring the accurate transmission of shaping force to the elastic core mold 1. The elastic core mold 1 and the fixed base 3 can be separated simply by loosening screw I4, without disassembling the entire mold head, making maintenance convenient. Furthermore, the connection is reliable, mold changing is efficient, fatigue life is long, and maintenance costs are low.

[0036] In the above embodiments, further: a positioning boss I is formed on the inner side of the elastic core mold 1, and a positioning boss II is formed on the top of the outer side of the core mold fixing seat 3. The positioning boss I and the positioning boss II are concentrically positioned and adapted to each other, thereby concentrically positioning the elastic core mold 1 and the core mold fixing seat 3.

[0037] It should be noted that the above embodiments are particularly suitable for industrial scenarios involving high-precision shaping, high temperature and pressure, or rapid mold changes. Positioning boss I and positioning boss II adopt a cylindrical surface fit (e.g., H7 / h6 clearance fit), replacing the point contact of traditional screw connections with surface contact, reducing the radial alignment error between the elastic core mold 1 and the core mold fixing seat 3 from ±0.1mm (screw positioning) to within ±0.01mm. When the mold head is subjected to lateral force, the cylindrical surface fit of positioning bosses I and II forms a self-guiding structure, automatically correcting the offset of the elastic core mold 1. The height difference between positioning bosses I and II forms a unique assembly direction, preventing reverse installation or incorrect assembly of the elastic core mold 1. During disassembly, the mating surfaces of positioning bosses I and II show no wear, and the initial alignment accuracy can be maintained after reassembly. The dimensions of positioning bosses I and II conform to ISO standards and can accommodate elastic core molds 1 and core mold fixing seats 3 of different shapes. The concentric positioning of the inner positioning boss Ⅰ of the elastic core mold 1 and the outer positioning boss Ⅱ of the core mold fixing seat 3 ensures high positioning mechanical precision, stable and reliable positioning at high temperatures, efficient manufacturing, long service life, standardized interface and quick mold change, reducing manufacturing costs and improving production flexibility.

[0038] In the above embodiments, preferably, the lower conical surface II of the elastic core mold 1 has a thin-walled structure, and the elastic core mold 1 is made of high-temperature resistant alloy spring steel.

[0039] It should be noted that the above embodiments have significant advantages in improving high-temperature resistance, elastic stability, lightweight design, fatigue strength, and processing adaptability. High-temperature alloy spring steel (such as alloy steel containing elements such as chromium, molybdenum, and tungsten) can still maintain high elastic limit and relaxation resistance under high-temperature environments. For example, 50CrVA steel can work for a long time at a temperature of 350-400℃ without significant creep. Alloy spring steel, through quenching and medium-temperature tempering treatment, obtains tempered troostite structure, which has both a high elastic limit (σe≥1200MPa) and good tempering stability. This allows the elastic mandrel 1 to maintain dimensional stability during repeated loading / unloading, reducing shaping errors caused by plastic deformation. The thin-walled lower conical surface II can further amplify the elastic deformation capacity of the material through geometric optimization. The thin-walled structure of the lower conical surface II can significantly reduce the mandrel mass, with a weight reduction ratio of over 50%, reducing the influence of inertial forces on the dynamic shaping process. Thin-walled processing of high-temperature alloy spring steel can reduce material waste and lower manufacturing costs. Elements such as chromium and molybdenum form fine carbides in spring steel, hindering dislocation movement and significantly improving fatigue life. For example, the fatigue limit σ-1 of 60Si2Mn steel can reach 450-550 MPa, making it suitable for high-frequency shaping conditions. The thin-walled design of the lower conical surface II transforms concentrated loads into distributed loads through geometric shape, reducing peak stress. Combined with the high toughness of spring steel (such as elongation after fracture δ≥10%), it can effectively resist impact loads during shaping, extending the service life of the mandrel. Alloy spring steel can be further enhanced through deformation heat treatment (such as high-temperature quenching + cold deformation). Its process window is highly compatible with the manufacturing process of elastic mandrels, facilitating manufacturing.

[0040] The working principle of this utility model is as follows: 16 miniature servo electric cylinders 5 are controlled by a computer program to synchronously and automatically push the elastic core mold 1 through parameters set on the computer human-machine interface, so as to deform the edge of the elastic core mold 1 and uniformly change the gap between the elastic core mold 1 and the elastic core mold, thereby solving the problem of uneven radial "wavy" thickness distribution in the molding of hollow products and achieving the ideal uniform radial wall thickness distribution of the product with automatic control; at the same time, it realizes the rapid, high-precision, online dynamic shaping adjustment of the elastic core mold 1.

[0041] As can be seen from the above description, this utility model achieves wave-free, fast, high-precision, and online dynamic shaping adjustment of the elastic core mold. It has a compact structure, is economical and practical, and is suitable for widespread application.

[0042] The various embodiments in this specification are described in a related manner. For the same or similar parts between the various embodiments, please refer to each other. Each embodiment focuses on describing the differences from other embodiments.

[0043] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the scope of protection of the present utility model. Any modifications and equivalent substitutions made within the spirit and principles of the present utility model are included within the scope of protection of the present utility model.

Claims

1. An elastic mandrel assembly based on servo electric cylinder drive, characterized in that: The elastic core mold assembly includes a core mold fixing seat (3) and an elastic core mold (1) that are modularly concentrically positioned and fixed together. Several micro servo electric cylinders (5) are evenly distributed and fixedly installed on the lower conical surface I of the core mold fixing seat (3). The several servo electric cylinders (5) perform adjustment actions synchronously, and the servo electric cylinders (5) press the lower conical surface II of the elastic core mold (1) at the end of the action to deform the edge of the elastic core mold (1) and realize the core mold shaping.

2. The elastic core mold assembly according to claim 1, characterized in that: The lower conical surface I of the core mold fixing seat (3) is evenly distributed with several threaded holes, and the servo electric cylinder (5) is fixedly installed by screwing the threaded holes with a screw interface.

3. The elastic core mold assembly according to claim 2, characterized in that: It also includes a locking nut (6), which is screwed to fit the screw interface of the servo cylinder (5), and the locking nut (6) is pressed against the lower conical surface I of the core mold fixing seat (3) to prevent the servo cylinder (5) from loosening.

4. The elastic core mold assembly according to claim 1, 2, or 3, characterized in that: The installation spacing of the servo electric cylinder (5) is less than 50mm; the servo electric cylinder (5) is a high-temperature resistant servo electric cylinder.

5. The elastic core mold assembly according to claim 1, characterized in that: The elastic core mold (1) is fixedly installed on the core mold fixing seat (3) by screw I (4), and the core mold fixing seat (3) is fixedly connected to the mold head by screw II (2).

6. The elastic core mold assembly according to claim 1 or 5, characterized in that: The elastic core mold (1) has a positioning boss I on its inner side, and the core mold fixing seat (3) has a positioning boss II on its outer top. The positioning boss I and the positioning boss II are concentrically positioned and adapted to each other, thereby concentrically positioning the elastic core mold (1) and the core mold fixing seat (3).

7. The elastic core mold assembly according to claim 6, characterized in that: The elastic core mold (1) has a thin-walled lower conical surface II, and the elastic core mold (1) is made of high-temperature resistant alloy spring steel.

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