A forging die for hot forging forming of an automobile suspension support

Abstract

The application discloses a forging die for hot forging forming of an automobile suspension support, and relates to the technical field of forging dies, which comprises a forming die body, a first square punch and a second square punch are arranged at the bottom of the forming die body, a pre-forging part and a finish-forging part are respectively formed on the first square punch and the second square punch, two cavities are arranged on the pre-forging part and the finish-forging part, and a lock catch is arranged at each corner of the forming die body. The application has the effect of integrated parallel processing.

Description

Technical Field

[0001] This invention relates to the technical field of forging dies, and in particular to a forging die for hot forging of automotive suspension supports. Background Technology

[0002] In the hot forging process of automotive suspension bearings, forging dies are required. Forging dies are special forming tools developed for the hot forging process of automotive suspension bearing parts. They take high-temperature metal blanks as the processing object, and complete the plastic deformation of the blanks through the shaping of the die cavity and the pressure of the punch. They integrate the functions of pre-forging, final forging and positioning guidance, and are the core equipment to ensure the structural strength and dimensional accuracy of suspension bearings.

[0003] Existing automotive suspension support hot forging forming dies mostly adopt a fixed single-cavity structure, without functional partition design for pre-forging and final forging, making it difficult to integrate and process in parallel, resulting in low hot forging production efficiency and uneven billet forming. Summary of the Invention

[0004] This application provides a forging die for hot forging of automotive suspension supports, which has the function of integrated parallel processing.

[0005] This application provides a forging die for hot forging of automotive suspension supports, which adopts the following technical solution: A forging die for hot forging of automotive suspension bearings includes a forming die body. The bottom of the forming die body is provided with a first square punch and a second square punch. A pre-forging part and a final forging part are respectively formed on the first square punch and the second square punch. Each of the pre-forging part and the final forging part is provided with two cavities. Locking buckles are provided at the four corners of the forming die body.

[0006] Preferably, the latch includes a guide structure and a draft angle, the guide structure forming a guide channel that defines lateral displacement, and the draft angle extending inward along the outer wall of the latch.

[0007] Preferably, the second square punch has an ejector hole on its edge, the ejector hole is axially aligned with the positioning hole of the base plate, and an ejector rod is slidably connected inside the ejector hole.

[0008] Preferably, an annular guide sleeve is fixed to the inner wall of the ejector hole. The guide sleeve is made of high-temperature resistant alloy and its inner diameter is adapted to the diameter of the ejector rod.

[0009] Preferably, the inner wall of the cavity is inlaid with a high-temperature resistant alloy plate, and the plate is fixedly connected to the molding body by threaded fasteners.

[0010] Preferably, the outer wall of the panel is provided with a self-lubricating coating, which is composed of a ceramic matrix composite material and has a thickness of less than 0.3 mm.

[0011] Preferably, the bottom of the panel is fitted with a bottom cover, the bottom cover being provided with a mounting hole and an interference fit assembly, the cross-section of the mounting hole matching the top opening of the panel.

[0012] Preferably, the interference fit assembly includes a conical locating pin and a disc spring. One end of the conical locating pin is embedded in the pin hole of the bottom cover, and the other end abuts against the disc spring and contacts the outer wall of the panel.

[0013] Preferably, the latches are rectangularly distributed at the four corners of the molded body, and the distance between adjacent latches is greater than their own width.

[0014] Preferably, the positioning hole and the ejector hole are collinearly arranged along a reference axis, and the distance between the top of the ejector rod and the bottom surface of the cavity is less than 5mm.

[0015] In summary, this application has the following beneficial effects: 1. To address the issues of low production efficiency and uneven billet forming in hot forging of automotive suspension bearings, this invention further optimizes the process by incorporating a pre-forging section and a final forging section, along with a dual-cavity structure. This enables integrated parallel processing of pre-forging and final forging, increasing output and reducing billet temperature loss and shape deviation. Subsequently, the symmetrical dual-cavity layout ensures more even stress distribution on the die, uniformly distributing heat to reduce thermal fatigue damage and significantly improving the dimensional consistency of batch forgings.

[0016] 2. To further address the issues of misalignment between the upper and lower dies and low forming accuracy during forging, this invention also incorporates a four-corner locking structure for the forming die. This structure provides omnidirectional positioning constraints, reduces guide clearance, minimizes die misalignment, and enhances die rigidity. Subsequently, the locking mechanism's integrated guide structure and draft angle not only provide precise positioning but also assist in demolding, reducing the surface defect rate of the forging and optimizing forming quality.

[0017] 3. To further optimize the process and address the issues of difficult demolding and potential damage to the mold and forgings after hot forging, this invention also incorporates an ejection structure with axial alignment between the ejector hole and the positioning hole. This achieves uniform force application from the ejector pin and smooth demolding. Subsequently, a high-temperature resistant alloy guide sleeve is installed inside the ejector hole to counteract the changes in clearance due to high-temperature thermal expansion, fundamentally resolving the problems of ejector pin jamming and poor ejection.

[0018] 4. To further address the issues of rapid high-temperature wear and mold adhesion within the cavity, this invention also incorporates a high-temperature resistant alloy insert and an interference fit assembly with the bottom cover. This achieves wear resistance and deformation resistance in the cavity, while allowing for controlled deformation of the insert to aid in demolding. Subsequently, the outer wall of the insert is coated with a ceramic-based self-lubricating coating to reduce frictional loss and, in conjunction with the interference fit assembly, extend the mold's service life. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the molding mold in Embodiment 1; Figure 2 This is a schematic diagram of the overall connection structure between the molding mold and the base plate in Embodiment 1. Figure 3 This is a schematic diagram of the internal structure of the interference fit component in Embodiment 2; Explanation of reference numerals in the attached drawings: 1. Molding mold body; 2. First square punch; 3. Second square punch; 4. Pre-forging part; 5. Final forging part; 6. Cavity; 7. Lock; 8. Base plate; 9. Positioning hole; 10. Ejector hole; 11. Ejector rod; 12. Panel; 13. Bottom cover; 14. Mounting hole; 15. Interference fit assembly; 1501. Pin hole; 1502. Conical positioning pin; 1503. Disc spring; 1504. Interlayer. Detailed Implementation

[0020] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content. Example 1

[0021] This invention discloses a forging die for hot forging of automotive suspension supports, such as... Figure 1 As shown, the mold includes a forming mold body 1. The bottom of the forming mold body 1 is provided with a first square punch 2 and a second square punch 3. The first square punch 2 and the second square punch 3 are respectively formed with a pre-forging part 4 and a final forging part 5. The pre-forging part 4 and the final forging part 5 of the forming mold body 1 are each provided with two cavities 6. The production output of the support forging is increased by using the double cavity 6 mold.

[0022] The forming mold body 1 serves as the core load-bearing component. The first square punch 2 and the second square punch 3 at its bottom correspond to the pre-forging part 4 and the final forging part 5, respectively, forming an integrated processing flow of "pre-forging-final forging".

[0023] During hot forging, the high-temperature billet first enters the pre-forging section 4 cavity 6, where it undergoes preliminary plastic deformation under the pressure of the punch, removing the oxide scale from the billet surface and adjusting the shape and size of the billet, laying a foundation for uniform material distribution for the final forging. Subsequently, the billet is transferred to the final forging section 5 cavity 6, where the punch applies precise pressure to make the billet completely conform to the contour of cavity 6, ultimately forming a suspension support that meets the design requirements.

[0024] The dual-cavity 6 design breaks the limitation of the traditional single-cavity 6 mold that can only forge one piece at a time. It can simultaneously perform pre-forging and final forging operations on two blanks, or complete the same step of forging for two blanks at the same time. Through parallel processing mode, it fundamentally improves forging output. Moreover, the design of connecting pre-forging and final forging effectively reduces temperature loss and shape deviation during blank transfer, ensuring the continuity and stability of forging.

[0025] Furthermore, the coordinated operation of the dual cavities 6 can significantly reduce thermal fatigue damage to the mold and extend its service life. In a traditional single-cavity mold, only one cavity 6 is subjected to force at a time, and the heat is concentrated in a single area, which is prone to local overheating and uneven cooling, leading to mold cracks. However, when the dual cavities 6 work simultaneously, the heat distribution is more uniform, and the heat from the pre-forging section 4 and the final forging section 5 can be mutually conducted and complemented, reducing local temperature differences in the mold, reducing thermal stress, and thus reducing damage such as cracks and wear, extending the mold maintenance cycle and service life.

[0026] In addition, the dual-cavity design can improve the dimensional accuracy and consistency of forgings. The symmetrical layout of the dual cavities 6 in the pre-forging section 4 and the final forging section 5 makes the mold more evenly stressed, avoiding forging deformation caused by stress offset in a single cavity 6; at the same time, the simultaneous processing of the two blanks can reduce the temperature difference and pressure deviation between batches, ensuring that the suspension supports produced in batches have uniform dimensions and consistent performance, and reducing the rework rate in subsequent processing.

[0027] Third, the dual-cavity 6 operation reduces unit energy consumption and production costs, synergizing with the first two benefits. Extended mold life reduces mold replacement costs, and improved forging precision reduces subsequent machining processes and material waste. Simultaneously, while increasing output, the dual-cavity 6 operation reduces energy consumption for mold heating and equipment operation per unit forging. Furthermore, the seamless connection between pre-forging and final forging reduces the additional energy required for billet heat preservation, creating a synergistic effect of "energy saving, cost reduction, and quality improvement," further enhancing production efficiency. In addition, the symmetrical structure of the dual-cavity 6 operation facilitates mold installation, debugging, and maintenance, reducing operational difficulty and indirectly improving production efficiency, forming a comprehensive synergistic advantage with increased output and reduced costs.

[0028] like Figure 1 As shown, four locking buckles 7 are provided at each of the four corners of the molding mold 1. The guide gap of the locking buckles 7 is 0.2mm and the draft angle is 5°, which is used to reduce the amount of mold misalignment.

[0029] Specifically, the locking buckles 7 are symmetrically arranged at the four corners of the punch, forming a comprehensive positioning constraint structure. This effectively restricts the lateral and longitudinal offset of the punch and die during the forging process, preventing die misalignment caused by uneven pressure in space. The guide clearance is set at 0.2mm. This dimension has been precisely calculated to ensure smooth cooperation between the locking buckles 7 and the corresponding slots of the die, avoiding jamming. It also minimizes positioning errors and prevents die misalignment caused by excessive clearance. At the same time, it reserves space for thermal expansion and contraction to prevent the die from jamming due to thermal expansion during high-temperature forging.

[0030] The 5° draft angle design reduces friction during forging demolding, preventing surface damage and mold wear caused by adhesion between the forging and cavity 6. It also helps correct the alignment of the punch and die, further reducing the risk of misalignment. These three elements work synergistically, through the positioning constraints of the four corner locks 7, the error control of precise guide clearance, and the auxiliary correction of the reasonable draft angle, forming a complete mold misalignment prevention system. This fundamentally reduces the amount of mold misalignment during forging and ensures the dimensional accuracy of the forging.

[0031] First, the locking structure 7 can significantly improve the overall rigidity and stability of the mold, extending its service life. The frame-like constraint formed by the four symmetrical locking buckles 7 can disperse the impact force during forging, avoiding deformation and breakage caused by localized stress concentration on the punch. In conjunction with the guide clearance and draft angle, it reduces mold wear and avoids mold collision damage caused by misalignment, indirectly extending the mold maintenance cycle.

[0032] In addition, it can improve the surface quality of forgings and reduce the difficulty of subsequent processing. The reduction of die misalignment can avoid defects such as steps and burrs in forgings, the 5° draft angle can reduce surface scratches during demolding, and the 0.2mm guide clearance ensures uniform stress during forging. The three factors work together to improve the flatness and smoothness of the forging surface and reduce subsequent grinding and machining processes.

[0033] like Figure 2 As shown, a base plate 8 is provided on the top of the molding body 1, and a positioning hole 9 is provided inside the base plate 8. Four ejection holes 10 are provided at the edge of the second square punch 3 of the molding body 1. The ejection holes 10 are positioned opposite to the positioning holes 9. An ejector rod 11 is provided inside the ejection hole 10 to assist in demolding.

[0034] Specifically, the base plate 8 serves as the mounting carrier for the ejector structure, providing a stable support foundation for the positioning holes 9 and ejector holes 10, ensuring the connection stability between the ejector system and the forming mold body 1. The positioning holes 9 are located inside the base plate 8, and their core function is to achieve precise alignment between the ejector holes 10 and the ejector pins 11, preventing uneven force application caused by the offset of the ejector pins 11. The four ejector holes 10 on the edge of the second square punch 3 are aligned with the positioning holes 9, ensuring that the ejector pins 11 can be accurately inserted into the ejector holes 10. Furthermore, the four ejector holes 10 are symmetrically distributed on the edge of the punch, allowing the ejector pins 11 to evenly cover the edge area of ​​the forging.

[0035] After hot forging, the forging adheres to the surface of the cavity 6 due to the high temperature. Under the action of external driving force, the ejector pin 11 applies a uniform pushing force to the edge of the forging through the ejector hole 10 to overcome the adhesion friction and assist the forging to be smoothly removed from the convex mold cavity 6. The alignment and fit between the positioning hole 9 and the ejector hole 10 avoid forging damage and mold jamming caused by the offset of the ejector pin 11, realizing a closed loop of "positioning-force application-demolding", which not only ensures smooth demolding, but also protects the forging and mold from damage.

[0036] Specifically, the precise alignment of the positioning hole 9 and the ejector hole 10 ensures that the ejector pin 11 applies force evenly, avoiding deformation of the forging due to force offset during demolding. At the same time, it prevents dimensional deviations caused by the forging sticking to the cavity 6, ensuring uniform size of forgings in mass production. Together with smooth demolding, this guarantees the quality of the forgings.

[0037] In addition, the uniform ejection force can prevent the mold cavity 6 from being worn and scratched due to the sticking of forgings. The precise alignment of the ejector pin 11 can prevent it from hitting the mold punch during ejection. The supporting effect of the base plate 8 can also disperse the impact force during ejection, reduce the local stress concentration of the mold, and work together with the demolding protection function to reduce the frequency of mold maintenance and replacement costs.

[0038] like Figure 2As shown, a high-temperature resistant guide sleeve is added to the ejector hole 10 of cavity 6. The high-temperature resistance and structural compatibility of the guide sleeve solve the problem of unstable clearance between the ejector hole 10 and the ejector rod 11. During hot forging, the mold is in a high-temperature environment, and the ejector hole 10 and ejector rod 11 will undergo dimensional changes due to thermal expansion. If the guide sleeve is not installed, the ejector hole 10 will expand irregularly after heating, causing the clearance between it and the ejector rod 11 to shrink or even disappear, leading to ejector rod 11 jamming and mold jamming. The high-temperature resistant guide sleeve is made of high-temperature resistant material, which can adapt to the high-temperature environment during hot forging and prevents itself from deforming due to high temperatures. At the same time, its fitting precision with the ejector hole 10 and ejector rod 11 is precisely designed to fix the fitting clearance between the ejector hole 10 and ejector rod 11, offsetting the difference in thermal expansion and contraction between the two under high-temperature conditions. The guide sleeve not only provides precise guidance, ensuring that the ejector rod 11 moves along a fixed trajectory, but also buffers the changes in clearance through its own structure, preventing the ejector rod 11 from getting stuck due to sudden changes in clearance. This fundamentally solves the mold jamming problem caused by high-temperature clearance changes and ensures the smooth operation of the ejection system. Example 2

[0039] Under continuous forging at 1050℃ with a single gap and a fixed draft angle, the thermal expansion and deformation of the mating surface of the lock 7 caused instability of the guide gap, and there was still a slight mold misalignment. The cavity 6 wall has no high-temperature wear-resistant reinforcement structure, and the high-temperature friction wear rate is fast, resulting in short mold life and frequent shutdowns for mold repair. Under high temperature, the mating clearance between the ejector pin 11 and the ejector hole 10 changes, occasionally causing mold jamming and poor ejection.

[0040] like Figure 3 As shown, the inner wall of cavity 6 is provided with a plate 12. The plate 12 is made of YG8 high temperature wear-resistant hard alloy. The original mold has problems such as unstable guide clearance of lock 7 leading to slight mold misalignment, rapid high temperature wear of cavity 6 wall, and occasional mold jamming due to changes in the gap between ejector pin 11 and ejection hole 10. The core problem is that the cavity 6 component is not resistant to high temperature, wear, and deformation.

[0041] YG8 cemented carbide, as a high-temperature wear-resistant material, possesses excellent high-temperature hardness, wear resistance, and resistance to thermal deformation. When made into a panel 12 and fixed to the inner wall of cavity 6, it directly replaces the original cavity 6 wall in contact with the high-temperature blank, fundamentally improving the cavity 6's high-temperature wear resistance and deformation resistance. The precise fit between the panel 12 and cavity 6 helps stabilize the overall structure of cavity 6, indirectly alleviating the guide clearance instability caused by thermal expansion deformation of the locking surface 7, and reducing minor mold misalignment. Simultaneously, its wear-resistant properties can reduce wear on cavity 6 caused by high-temperature friction, preventing cavity 6 wall deformation from indirectly affecting the fit clearance between ejector hole 10 and ejector pin 11, thus helping to improve ejection difficulties and mold jamming problems. This achieves a synergistic effect of "strengthening cavity 6 - alleviating mold misalignment - reducing wear - optimizing ejection," fundamentally solving the core defects of the original mold.

[0042] like Figure 3As shown, the bottom of the first square punch 2 and the second square punch 3 is provided with a bottom cover 13. The bottom cover 13 has a mounting hole 14 with a cross-sectional dimension smaller than that of the opening of the cavity 6. The cross-section of the mounting hole 14 matches that of the opening of the cavity 6. Several interference fit components 15 are evenly arranged on the bottom cover 13 and around the mounting hole 14. The interference fit components 15 are evenly distributed around the mounting hole 14. During the demolding process, the interference fit components perform a precise fitting action, generating a uniform outward force that is transmitted to the punch, thereby driving the YG8 cemented carbide insert 12 on the inner wall of the cavity 6 to undergo slight outward elastic deformation. This controllable deformation can break the adhesion between the forging and the inner wall of the insert 12 under high temperature conditions, forming a small gap between them, thereby quickly separating and achieving assisted demolding. This principle relies on the deformation resistance of the panel 12 itself to avoid excessive deformation and damage to the panel 12. It also ensures a smooth demolding process through the uniform force applied by the interference fit component. At the same time, it works in synergy with the previous ejection system to further optimize the demolding effect and solve the problems of sticking and poor ejection during high-temperature demolding.

[0043] Specifically, the interference fit drives the panel 12 to deform evenly and slightly, avoiding scratches on the inner wall of the panel 12 and damage to the surface of the forging caused by traditional forced demolding. At the same time, it reduces fatigue deformation of the panel 12 caused by excessive local stress. In conjunction with the wear-resistant and deformation-resistant characteristics of the YG8 panel 12, it further extends the replacement cycle of the panel 12.

[0044] like Figure 3 As shown, specifically, the interference fit assembly includes a circular pin hole 1501 disposed on the bottom cover 13 and located on the periphery of the mounting hole 14. A conical positioning pin 1502 is disposed inside the pin hole 1501. A high-temperature resistant disc spring 1503 is disposed at the conical end of the conical positioning pin 1502. The high-temperature resistant disc spring 1503 is located in the interlayer 1504 between the panel 12 and the cavity 6. The circular pin hole 1501 serves as the mounting carrier for the conical positioning pin 1502 and is fixed to the periphery of the mounting hole 14 on the bottom cover 13, ensuring the accurate movement trajectory of the positioning pin and providing a basis for the fit of the entire interference fit assembly.

[0045] During the forging process, the forging force is transmitted to the conical positioning pin 1502, which pushes it to move towards the interlayer 1504 between the insert 12 and the cavity 6, compressing the high-temperature resistant disc spring 1503 in the interlayer 1504. At the same time, it drives the YG8 hard alloy insert 12 on the inner wall of the cavity 6 to accurately reset inward, conforming to the contour of the cavity 6, forming the initial forming state of the forging support, and ensuring the forming accuracy of the forging.

[0046] During the demolding stage, the forging force disappears, and the high-temperature resistant disc spring 1503 resets using its own elastic potential energy, pushing the conical locating pin 1502 in the opposite direction, thereby driving the insert 12 to undergo slight elastic deformation outward. This deformation breaks the adhesion between the forging and the inner wall of the insert 12 at high temperatures, forming a tiny gap, allowing the forging to smoothly detach from the insert 12. At the same time, in conjunction with the ejection system and the high-temperature resistant guide sleeve, it completely solves the problems of poor demolding and mold jamming at high temperatures. Furthermore, relying on the deformation resistance of the YG8 insert 12, it avoids excessive deformation and damage to the insert 12.

[0047] Furthermore, the precise fit between the conical locating pin 1502 and the circular pin hole 1501 ensures the consistency of the inward reset of the insert 12 during forging, avoids the dimensional deviation of the forging caused by the offset of the insert 12, and at the same time, the insert 12 deforms evenly during demolding, reducing the deformation caused by uneven stress on the forging, and further improving the dimensional consistency of batch forgings.

[0048] In addition, the high-temperature resistant disc spring 1503 can buffer the impact force during forging and demolding, reducing the wear of the conical locating pin 1502 and the insert 12; the guiding function of the pin hole 1501 prevents the locating pin from shifting and getting stuck, reducing component damage. Together with the wear-resistant and deformation-resistant characteristics of the YG8 insert 12 and the anti-jamming function of the high-temperature resistant guide sleeve, it reduces the frequency of replacement of vulnerable parts of the mold.

[0049] Third, the insert 12 smoothly separates from the forging, greatly reducing the ejection load on the ejector rod 11, preventing the ejector rod 11 from bending or jamming, and reducing friction and wear between the ejector hole 10 and the ejector rod 11. It works in synergy with the ejection system and guide sleeve to further reduce the probability of production interruption.

[0050] The outer wall of the insert 12 is coated with a high-temperature self-lubricating ceramic coating. As a core component of the inner wall of the cavity 6, the insert 12 is made of YG8 high-temperature wear-resistant hard alloy. Its outer wall is in direct contact with the inner wall of the cavity 6 and the high-temperature disc spring 1503. During the repeated movements of forging and demolding, high-temperature friction and wear are easily generated, and the smoothness of the deformation of the insert 12 may be affected due to excessive frictional resistance.

[0051] The high-temperature self-lubricating ceramic coating possesses excellent high-temperature stability, low coefficient of friction, and wear resistance. After being applied to the outer wall of the insert 12, it forms a stable lubricating protective film in a high-temperature environment, reducing the frictional resistance between the insert 12 and the inner wall of the cavity 6 and the disc spring. This ensures that the insert 12 can smoothly and without jamming during inward reset and outward deformation under the drive of the interference fit assembly. Simultaneously, the coating isolates the outer wall of the insert 12 from direct erosion by the high-temperature environment, further enhancing its resistance to thermal deformation. In synergy with the properties of the YG8 material, it ensures controllable deformation of the insert 12 to facilitate demolding while reducing frictional wear, thus resolving the potential problems of rapid wear and high movement resistance on the original insert 12 outer wall.

[0052] Working principle: First, after the hot forging production starts, the metal billet of the automobile suspension support, heated to the process temperature, is sent into the double cavity 6 of the pre-forging part 4 corresponding to the first square punch 2 at the bottom of the forming die 1. The forming die 1 closes and applies pressure. The billet completes the initial plastic deformation in the cavity 6 of the pre-forging part 4, removes the surface oxide scale, and regulates the shape and size of the billet, laying a uniform material distribution foundation for the final forging. The double cavity 6 of the pre-forging part 4 can process two billets simultaneously, starting the parallel processing mode.

[0053] Then, the pre-forged billet is quickly transferred to the double cavity 6 of the final forging section 5 corresponding to the second square punch 3. The forming die 1 is closed and forged again. At this time, the locking buckles 7 at the four corners of the forming die 1 play a positioning role, the guide structure forms a guide channel to limit the lateral displacement, the draft angle assists in the mold closing correction, and the 0.2mm precise guide gap avoids the misalignment of the upper and lower dies. The billet is shaped under high pressure in the cavity 6 of the final forging section 5, completely conforming to the contour of the cavity 6, and is formed into a suspension support forging that meets the design requirements. The synchronous final forging of the double cavity 6 further improves the production efficiency.

[0054] Subsequently, after the forging and forming are completed, the mold is opened and the ejection system is activated. The positioning hole 9 of the bottom plate 8 is axially aligned with the ejection hole 10 on the edge of the second square punch 3. Under the action of external driving force, the ejector rod 11 in the ejection hole 10 applies a uniform pushing force to the edge of the forging. The high-temperature alloy guide sleeve on the inner wall of the ejection hole 10 fixes the movement trajectory of the ejector rod 11, offsets the gap change caused by high temperature thermal expansion, and avoids the ejector rod 11 from getting stuck, thus initially completing the separation of the forging from the cavity 6.

[0055] Next, the interference fit component 15 of the bottom cover 13 works together. After the forging force disappears, the high-temperature resistant disc spring 1503 releases elastic potential energy, pushing the conical positioning pin 1502 to move in the opposite direction. This drives the YG8 high-temperature resistant alloy insert 12 on the inner wall of the cavity 6 to produce a slight outward elastic deformation. The ceramic-based self-lubricating coating on the outer wall of the insert 12 reduces frictional resistance, allowing the insert 12 to deform smoothly without jamming. This breaks the high-temperature adhesion between the forging and the inner wall of the insert 12, forming a small demolding gap. Together with the ejector pin 11, it forms a dual-cooperative demolding mechanism, completely solving the problem of high-temperature demolding adhesion.

[0056] Finally, after demolding, the conical locating pin 1502 returns to its original position under the reset action of the disc spring, causing the insert 12 to precisely fit the inner wall of the cavity 6, restoring the cavity 6 to its forming state, ready for the next forging cycle.

[0057] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A forging die for hot forging of automotive suspension supports, characterized in that, The mold includes a molding body (1), the bottom of which is provided with a first square punch (2) and a second square punch (3). The first square punch (2) and the second square punch (3) are respectively formed with a pre-forging part (4) and a final forging part (5). The pre-forging part (4) and the final forging part (5) are each provided with two cavities (6). The four corners of the molding body (1) are provided with latches (7). The inner wall of the cavity (6) is inlaid with a high-temperature resistant alloy plate (12), and the plate (12) is fixedly connected to the molding body (1); The outer wall of the panel (12) is provided with a self-lubricating coating, which is made of ceramic matrix composite material and has a thickness of less than 0.3 mm; The bottom of the panel (12) is fitted with a bottom cover (13), and the bottom cover (13) is provided with a mounting hole (14) and an interference fit assembly (15). The cross section of the mounting hole (14) matches the top opening of the panel (12). The interference fit assembly (15) includes a conical locating pin (1502) and a disc spring (1503). One end of the conical locating pin (1502) is embedded in the pin hole (1501) of the bottom cover (13), and the other end abuts against the disc spring (1503) and contacts the outer wall of the panel (12). The panel (12) is made of YG8 high-temperature wear-resistant hard alloy with deformation capability; and the high-temperature resistant disc spring (1503) is located in the interlayer (1504) between the panel (12) and the cavity (6).

2. The forging die for hot forging of automotive suspension supports according to claim 1, characterized in that, The latch (7) includes a guide structure and a draft angle, the guide structure forming a guide channel that limits lateral displacement, and the draft angle extending inward along the outer wall of the latch (7).

3. The forging die for hot forging of automotive suspension supports according to claim 1, characterized in that, The second square punch (3) has an ejector hole (10) on its edge. The ejector hole (10) is axially aligned with the positioning hole (9) of the base plate (8). An ejector rod (11) is slidably connected inside the ejector hole (10).

4. The forging die for hot forging of automotive suspension supports according to claim 3, characterized in that, An annular guide sleeve is fixed to the inner wall of the ejector hole (10). The guide sleeve is made of high temperature resistant alloy and its inner diameter is adapted to the diameter of the ejector rod (11).

5. The forging die for hot forging of automotive suspension supports according to claim 1, characterized in that, The latches (7) are rectangularly distributed at the four corners of the molding body (1), and the distance between adjacent latches (7) is greater than their own width.

6. The forging die for hot forging of automotive suspension supports according to claim 3, characterized in that, The positioning hole (9) and the ejection hole (10) are collinearly arranged through a reference axis, and the distance between the top of the ejector rod (11) and the bottom surface of the cavity (6) is less than 5mm.

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