Composite die for stamping automobile parts

Abstract

The present invention relates to the field of mold technology. The present invention provides a composite mold for stamping automobile parts, including a mounting part for connecting to the bottom of the punch, an upper mold connected to the bottom of the mounting part, a mounting cavity in the upper mold, a rotating part arranged in the mounting cavity, a plurality of rotating parts evenly arranged along the edge of the mounting cavity, the mounting part is connected to the rotating part by a bolt passing through the top wall of the upper mold, the bolt rotates with the upper mold, a clamping part is slidably arranged in the mounting cavity, the clamping part can slide horizontally under the rotation of the rotating part, a torque limiting part is arranged in the mounting cavity and is connected to the clamping part. Through the above technical solution, the technical problem of poor matching accuracy of the stamping surface after installation due to different bolt torques during composite mold assembly in related technologies / existing technologies is solved, thereby improving the processing accuracy of stamping.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of mold technology, and in particular, to a composite mold for stamping automobile parts. Background Art

[0002] In the automotive stamping industry, die installation accuracy and structural stability directly determine the quality and production efficiency of stamped parts. During the installation of traditional composite dies, issues such as improper bolt torque control and an illogical installation sequence become key bottlenecks restricting machining accuracy and equipment reliability.

[0003] Early composite mold installation relied on manual experience, making it difficult for operators to precisely control the torque of each bolt. This often led to individual bolts breaking due to excessive torque, or uneven torque causing deviations in mold surface levelness. Furthermore, traditional installation methods lacked effective torque limits and alarm mechanisms, preventing timely intervention in the event of operational errors. This often required mold disassembly for secondary adjustments, wasting significant time and labor.

[0004] The connection structure design of traditional molds is flawed, with insufficient precision in the fitting between rotating parts and clamping parts, making it difficult to achieve dynamic torque balance. During installation, operators typically tighten the bolts point by point rather than in asymmetrical groups, resulting in uneven stress distribution within the mold. This can lead to problems such as loose bolts and mold deformation after long-term use. Furthermore, the rigid connection structure lacks a torque limiter and cannot accommodate torque fluctuations caused by vibration during the stamping process, potentially causing fatigue fracture of the bolts and affecting the continuity of the production line. Summary of the Invention

[0005] To overcome the above-mentioned defects, the present invention provides a composite die for stamping automobile parts, which solves the technical problem in the prior art that different bolt torques during assembly of the composite die lead to poor matching accuracy of the stamping surfaces after installation.

[0006] According to one aspect, at least one embodiment of the present invention provides a composite die for stamping automobile parts, comprising:

[0007] A mounting piece, used for connecting below the punch;

[0008] An upper mold, the upper mold being connected to the lower side of the mounting member and having a mounting cavity therein;

[0009] A rotating member, the rotating member is disposed in the mounting cavity, and the rotating members are arranged evenly along the edge of the mounting cavity. The mounting member is connected to the rotating member by a bolt passing through the top wall of the upper mold, and the bolt is rotatably engaged with the upper mold;

[0010] a clamping member, the clamping member being slidably disposed in the mounting cavity and capable of sliding horizontally under the rotation of the rotating member;

[0011] A torque limiting member is disposed in the mounting cavity and is connected to the clamping member. When the rotational torque of the bolt is greater than the maximum load torque of the torque limiting member, the torque limiting member cancels the restriction on the clamping member, so that the clamping member slides to cooperate with the rotation of the rotating member, thereby preventing the bolt from breaking.

[0012] For example, in at least one embodiment of the present disclosure, a composite die for stamping automobile parts is provided, wherein the torque limiter comprises:

[0013] a hydraulic component, the hydraulic component being disposed in the mounting cavity, a slide rod being slidably connected in the hydraulic component, the slide rod being connected to the clamping component, a piston being disposed on the slide rod, the piston dividing the hydraulic cavity of the hydraulic component into a first oil cavity and a second oil cavity;

[0014] a pressure relief oil pipe connected to the second oil chamber, wherein a one-way pressure valve is provided on the pressure relief oil pipe, and the sliding rod can open the one-way pressure valve under the sliding drive of the clamping member to relieve pressure in the second oil chamber;

[0015] a reset oil pipe, the reset oil pipe being arranged between the one-way pressure valve and the second oil chamber via a three-way pipe fitting, the reset oil pipe being provided with a one-way valve capable of opening to pressurize the second oil chamber and reset the clamping member;

[0016] A disassembly oil pipe is communicated with the first oil chamber, and a valve is provided on the disassembly oil pipe. The valve is used to close the disassembly oil pipe to lock the clamp.

[0017] For example, in at least one embodiment of the present disclosure, a composite die for stamping automobile parts is provided, wherein the rotating part includes:

[0018] a first rotating ring, the first rotating ring being rotatably disposed in the mounting cavity;

[0019] a second rotating ring, the second rotating ring being rotatably disposed in the mounting cavity and being located below the first rotating ring;

[0020] Thrust bearings, wherein there are multiple thrust bearings, one of which is disposed between the first rotating ring and the second rotating ring, and the first rotating ring and the second rotating ring respectively abut against the cavity wall of the mounting cavity through one thrust bearing;

[0021] The first rotating ring has a first threaded hole at its center, and the second rotating ring has a second threaded hole at its center. The first threaded hole and the second threaded hole are used to connect with the bolt. The first rotating ring and the second rotating ring are both provided with teeth on the outside. The clamping member is a rack, and there are two of them. The first rotating ring and the second rotating ring are engaged with the two clamping members one by one.

[0022] For example, in at least one embodiment of the present disclosure, a composite die for stamping an automobile part is provided, wherein the diameter of the first threaded hole is larger than the diameter of the second threaded hole, and the bolt comprises:

[0023] a first screw rod, the first screw rod passing through the mounting member and threadedly disposed in the first threaded hole, the first screw rod having a third threaded hole coaxial with and having the same diameter as the second threaded hole;

[0024] The second screw rod has threads arranged in the second threaded hole and the third threaded hole, and the second threaded hole and the first threaded hole have opposite thread directions.

[0025] For example, at least one embodiment of the present disclosure provides a composite mold for stamping automobile parts, wherein the mounting part has a mounting through hole, the bolt passes through the mounting through hole, the mounting part has an annular groove portion located on the outer periphery of the upper end of the mounting through hole and connected to the mounting through hole, a thrust bearing is arranged in the annular groove portion, and the nut portion of the bolt abuts against the top surface of the thrust bearing.

[0026] For example, at least one embodiment of the present disclosure provides a composite die for stamping automotive parts, further comprising:

[0027] A sliding member, the sliding member is slidably arranged in the mounting cavity, two clamping members corresponding to one rotating member are slidably arranged on one sliding member, and the torque limiting member is arranged on the sliding member;

[0028] A screw rod passes through the wall of the installation cavity and is rotatably connected to the sliding member. After rotation, it is used to drive the sliding member to slide radially along the installation cavity. The outer end of the screw rod has a handle portion, and the handle portion has a limiting portion. The outer periphery of the upper mold is provided with a swinging clamping member, and the clamping member engages with or cancels the clamping member after swinging.

[0029] For example, at least one embodiment of the present disclosure provides a composite die for stamping automobile parts, wherein the upper die includes:

[0030] A mold, the mold being used for cooperating with a lower mold for stamping;

[0031] The upper cover is arranged above the mold, and the upper cover and the mold form the installation cavity. The upper cover and the adjacent sides of the mold respectively have an annular limiting groove, the first rotating ring and the second rotating ring both have a cylindrical protrusion, the thrust bearing is arranged at the bottom of the annular limiting groove, and the cylindrical protrusion is rotatably arranged in the annular limiting groove.

[0032] For example, at least one embodiment of the present disclosure provides a composite die for stamping automotive parts, wherein the first screw is a hexagonal screw, the nut portion of the second screw is located within the inner six holes of the nut portion of the first screw, and the inner six holes have a locking space formed on the outer periphery of the second screw nut portion, and further includes:

[0033] A locking member is provided in the locking space and is used to prevent the first screw and the second screw from rotating relative to each other due to vibration.

[0034] For example, in at least one embodiment of the present disclosure, a composite die for stamping automobile parts is provided, wherein the retaining member includes:

[0035] a first clamping block, the first clamping block being disposed in the locking space, the first clamping block having a downwardly opening recess for accommodating a nut of the second screw;

[0036] The second clamping block is connected below the first clamping block and extends downward into the hexagonal groove of the nut of the second screw rod. The first clamping block and the second clamping block are an integral or split structure.

[0037] For example, in at least one embodiment of the present disclosure, a composite die for stamping automobile parts is provided, wherein the material of the retaining member is an elastic rubber component.

[0038] The beneficial effects of the embodiments of the present invention are:

[0039] In the present invention, the edge of the mounting cavity is equidistant from the edge of the upper mold, and the rotating parts are evenly distributed on the upper surface of the upper mold. Combined with the operating specifications of tightening the bolts in diagonal groups, the installer can more intuitively follow the principle of symmetrical tightening during the tightening process, ensuring that the connection between the upper mold and the mounting parts is evenly stressed, effectively reducing the stress concentration problem of the mold structure caused by improper installation sequence, and improving installation efficiency and accuracy.

[0040] Under normal installation conditions, the rotating part cooperates with the clamping part to keep the clamping part in a fixed state, and the torque limiter maintains the limit on the rotational torque of the bolt, ensuring that the mounting part and the upper mold are firmly connected by bolts, realizing reliable assembly of the mold and ensuring the stability of the mold structure during the stamping process of automotive parts.

[0041] When the installer is tightening the bolts, the applied rotational torque is too large due to operational errors. The torque limiter releases the restriction after being subjected to excessive pressure transmitted by the clamping part. The clamping part slides under the action of the rotating part, and the rotating part then rotates in the installation cavity, preventing the bolts from breaking due to excessive torque. At the same time, it effectively prevents the installation torque difference of several bolts between the upper mold and the mounting part from being too large, ensuring the consistency and reliability of the mold installation.

[0042] If an operator mistakenly causes excessive torque on a bolt at a certain point, the bolt drives the rotating part to rotate synchronously, and this abnormal rotation exceeds the set range of the torque limiter. At this time, the torque limiter triggers an alarm mechanism, prompting the operator to stop the current operation and tighten the next bolt promptly through sound and light, avoiding the risk of damage caused by overtightening a single bolt and realizing intelligent monitoring and proactive protection during the installation process.

[0043] The synergistic effect of rotating parts, torque limiters, and installation operating procedures effectively prevents chain reactions caused by excessive torque on individual bolts, ensuring that the installation torque of each bolt is within a reasonable range with minimal differences between them. Even in complex installation scenarios involving multiple people, the stability and reliability of the connection between the upper mold and the mounting parts are guaranteed.

[0044] By controlling the torque, the surface levelness of the upper die is ensured, thereby ensuring the stamping quality during the stamping process, avoiding stamping errors caused by different bolt torques, and improving product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly describes the drawings required for describing the embodiments of the present invention. Obviously, the drawings described below are merely exemplary embodiments of the present invention. Those skilled in the art can, without inventive effort, derive other drawings based on the contents of the exemplary embodiments of the present invention and these drawings.

[0046] Figure 1 A schematic structural diagram of an embodiment of the present invention;

[0047] Figure 2 for Figure 1 A schematic diagram of the main structure of an embodiment of the present invention;

[0048] Figure 3 for Figure 2 Schematic diagram of the cross-sectional structure of AA;

[0049] Figure 4 for Figure 3 A schematic diagram of the enlarged structure of B;

[0050] Figure 5 for Figure 1 The enlarged structural diagram of C in the middle;

[0051] Figure 6 for Figure 1 A schematic diagram of the structure inside the installation cavity in the embodiment;

[0052] Figure 7 for Figure 1 Schematic diagram of the principle of the torque limiting member in the embodiment;

[0053] In the figure: mounting part 1, mounting through hole 101, annular groove 102, upper mold 2, mounting cavity 201, mold 202, upper cover 203, annular limiting groove 204, rotating part 3, first rotating ring 301, second rotating ring 302, thrust bearing 303, first threaded hole 304, second threaded hole 305, tooth portion 306, cylindrical protrusion 307, bolt 5, first screw 501, third threaded hole 502, second screw 503, locking space 504, clamping part -6, torque limiting part-7, hydraulic part-701, sliding rod-702, piston-703, first oil chamber-704, second oil chamber-705, pressure relief oil pipe-706, one-way pressure valve-707, reset oil pipe-708, one-way valve-709, disassembly oil pipe-710, valve-711, sliding part-8, screw rod-9, handle part-901, limit part-902, clamping part-10, lower mold-11, locking part-12, first clamping block-1201, clearance groove-1202, second clamping block-1203. DETAILED DESCRIPTION

[0054] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention.

[0055] To simplify the drawings, only portions relevant to the invention are schematically depicted in each figure; they do not represent the actual structure of the product. Furthermore, to simplify the drawings and facilitate understanding, in some figures, only one component with the same structure or function is schematically depicted or labeled. In this document, "one" not only means "only one" but also "more than one," and "several" includes "two" and "more than two."

[0056] It should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they can refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on the specific circumstances.

[0057] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0058] In the description of this embodiment, the terms "up", "down", "left", "right", etc., and the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation on the present invention.

[0059] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0060] like Figures 1 to 7 As shown, it shows a composite die for stamping automobile parts in one embodiment of the present invention.

[0061] In some examples, the edge of the mounting cavity 201 is equidistant from the edge of the upper mold 2, and the rotating parts 3 are evenly distributed on the upper surface of the upper mold 2. Combined with the operating specifications of tightening the bolts 5 in diagonal groups, the installer can more intuitively follow the principle of symmetrical tightening during the tightening process, ensuring that the connection between the upper mold 2 and the mounting part 1 is evenly stressed, effectively reducing the stress concentration problem of the mold structure caused by improper installation sequence, and improving installation efficiency and accuracy.

[0062] Under normal installation conditions, the rotating part 3 cooperates with the clamping part 6 to keep the clamping part 6 in a fixed state, and the torque limiter 7 keeps limiting the rotational torque of the bolt 5, ensuring that the mounting part 1 and the upper mold 2 are firmly connected through the bolt 5, realizing reliable assembly of the mold and ensuring the stability of the mold structure during the stamping process of automotive parts.

[0063] When the installer is tightening the bolt 5, the applied rotational torque is too large due to operational errors. The torque limiter 7 releases the restriction after being subjected to excessive pressure transmitted by the clamping member 6. The clamping member 6 slides under the action of the rotating member 3, and the rotating member 3 then rotates in the installation cavity 201, preventing the bolt 5 from breaking due to excessive torque. At the same time, it effectively prevents the installation torque difference of several bolts 5 between the upper mold 2 and the mounting member 1 from being too large, thereby ensuring the consistency and reliability of the mold installation.

[0064] If an operator misoperates at a certain point, causing excessive torque on bolt 5, bolt 5 drives rotating member 3 to rotate synchronously, and this abnormal rotation exceeds the set range of torque limiter 7. At this point, torque limiter 7 triggers an alarm mechanism, prompting the operator to stop the current operation and tighten the next bolt 5 through sound and light, thereby avoiding the risk of damage caused by overtightening a single bolt and achieving intelligent monitoring and proactive protection during the installation process.

[0065] The coordinated action of the rotating member 3, the torque limiter 7, and the standard installation procedures effectively prevents chain reactions caused by excessive torque on individual bolts, ensuring that the installation torque of each bolt 5 is within a reasonable range with minimal variation between them. This ensures a stable and reliable connection between the upper mold 2 and the mounting member 1, even in complex installation scenarios involving multiple people working together.

[0066] By controlling the torque, the surface levelness of the upper die 2 is ensured, thereby ensuring the stamping quality during the stamping process, avoiding stamping errors caused by different torques of the bolts 5, and improving product quality.

[0067] In some examples, under normal installation conditions, the slide rod 702 and piston 703 of the hydraulic component 701 remain stable, the hydraulic oil pressure in the first oil chamber 704 and the second oil chamber 705 is balanced, the one-way pressure valve 707 is closed, and the one-way valve 709 on the reset oil pipe 708 prevents the hydraulic oil from flowing back, ensuring that the torque limiter 7 effectively limits the rotational torque of the bolt 5. The clamping member 6 remains fixed in place with the cooperation of the rotating member 3, firmly connecting the mounting member 1 and the upper die 2 via the bolt 5, providing a stable and reliable die structure for the stamping process of automotive parts.

[0068] When the torque on bolt 5 is too high, the excessive pressure is transmitted to hydraulic component 701 through clamping component 6, pushing piston 703 on slide rod 702 and increasing the hydraulic oil pressure in second oil chamber 705. When the pressure exceeds the set threshold of one-way pressure valve 707, it opens, allowing the hydraulic oil in second oil chamber 705 to be discharged through pressure relief pipe 706, and torque limiter 7 releases its restriction. At this point, clamping component 6 slides under the action of rotating component 3, which rotates within mounting cavity 201. This prevents bolt 5 from breaking due to overload and prevents excessive differences in the installation torque of each bolt 5, thus ensuring mold installation quality. During mold disassembly, valve 711 on disassembly pipe 710 is closed, preventing the hydraulic oil in first oil chamber 704 from being discharged through disassembly pipe 710. The resistance of hydraulic component 701 remains constant, and hydraulic component 701 remains inactive. This allows clamping component 6 and rotating component 3 to operate in coordination, preventing the rotating component 3 from rotating freely within mounting cavity 201. This ensures smooth removal of bolt 5 and minimizes damage to mold components during disassembly. After disassembly is completed, valve 711 is opened, and hydraulic oil can enter the hydraulic component 701 through the reset oil pipe 708 and the one-way valve 709, so that the piston 703 is reset and ready for the next use, thereby improving the maintenance efficiency and service life of the mold.

[0069] In some examples, under normal installation conditions, a thrust bearing 303 is provided between the first rotating ring 301 and the second rotating ring 302 to ensure relative rotation. The first rotating ring 301 and the second rotating ring 302 each abut against the upper and lower walls of the mounting cavity 201 via a thrust bearing 303, enabling rotation within the mounting cavity 201. The provision of the thrust bearing 303 effectively reduces rotational resistance, ensuring synchronous and smooth rotation of the first and second rotating rings 301, 302 during the tightening of the bolt 5. The meshing relationship between the teeth 306 and the clamping member 6 (rack) ensures a stable linkage between the rotating member 3 and the clamping member 6. The clamping member 6 remains fixed under the constraint of the torque limiter 7. This, in turn, ensures that the installation torque of the bolt 5 is precisely limited within a set range through the rotating member 3, providing reliable connection strength for the mold.

[0070] When the torque on the bolt 5 becomes excessive, the hydraulic system of the torque limiter 7 is triggered (the pressure in the second oil chamber 705 increases, causing the one-way pressure valve 707 to open), causing the clamp 6 to lose its restraint and begin to slide. At this point, the teeth 306 on the exterior of the first and second rotating rings 301, 302 cooperate with the rack structure of the clamp 6, enabling the rotating member 3 to quickly convert the overload torque of the bolt 5 into its own rotational kinetic energy. A thrust bearing 303 is provided between the first and second rotating rings 301, 302 to ensure relative rotation. Each of the first and second rotating rings 301, 302 abuts against the upper and lower walls of the mounting cavity 201 via a thrust bearing 303. This dual-ring design ensures smooth rotation, effectively dissipates overload stress, and prevents bolt 5 from breaking due to localized stress concentration. Furthermore, the thrust bearing 303 between the two rings further enhances structural stability, ensuring that the rotating member 3 maintains coaxial rotation even under overload conditions, preventing seizure.

[0071] During mold disassembly, valve 711 on disassembly oil pipe 710 is closed, increasing the resistance of hydraulic component 701 and preventing the sliding of clamping component 6. At this point, when the operator loosens bolt 5, the first and second rotating rings 301, 302, supported by thrust bearing 303, cannot rotate. The meshing relationship between the teeth 306 and clamping component 6 ensures their fixed position. After disassembly, valve 711 is opened, hydraulic component 701 is reset, and clamping component 6 re-constrains rotating component 3. Thanks to the low-friction characteristics of thrust bearing 303, rotating component 3 can be quickly stopped and precisely positioned, ready for the next installation, significantly improving mold maintenance efficiency.

[0072] The dual-ring design of the first rotating ring 301 and the second rotating ring 302, coupled with the thrust bearing 303, significantly enhances the anti-eccentricity capability of the rotating member 3 when engaged with the bolt 5, compared to a conventional single-ring structure. This ensures that even if eccentric forces act during the installation of the bolt 5, they can be quickly detected and corrected, avoiding uneven torque transmission caused by eccentricity. The rack meshing structure of the teeth 306 and the clamping member 6 provides precise motion transmission, making the torque limiter 7 more reliable in restraining the rotating member 3.

[0073] In some examples, the combined design of the first screw 501 and the second screw 503 creates a dual-stage preload during installation by arranging the first threaded hole 304 (large diameter) and the second threaded hole 305 (small diameter) in opposite directions. When the first screw 501 is tightened, its engagement with the first threaded hole 304 provides an initial preload. Subsequently, the second screw 503 is tightened. Because the second threaded hole 305 and the first threaded hole 304 have opposite directions, tightening the second screw 503 causes the first screw 501 to rotate in the opposite direction. However, this is constrained by the first rotating ring 301, creating a self-tightening force within the bolt 5. This dual-stage preload mechanism significantly improves the bolt connection's resistance to loosening, particularly under the high-frequency vibration conditions typically encountered in automotive parts stamping. It effectively prevents loosening of the bolts, which can lead to a decrease in mold precision. Disassembly can be performed in the reverse order of installation.

[0074] The design of the first threaded hole 304 having a larger diameter than the second threaded hole 305 creates a gradient stress distribution when the bolt 5 transmits torque. The larger diameter first screw 501 bears the primary axial tension, while the smaller diameter second screw 503, through cooperation with the third threaded hole 502, evenly distributes the torque to the first rotating ring 301 and the second rotating ring 302 of the rotating member 3. This structure avoids the stress concentration problem caused by traditional single-screw bolts at the root of the thread, extending the service life of the bolt 5 and the rotating member 3. At the same time, the redundant design of the twin-screw structure improves the reliability of the connection. Even if one screw suffers minor damage, the other can still maintain the basic connection strength, reducing the risk of sudden mold failure.

[0075] When the bolt 5 is subjected to excessive torque, the first screw 501 and the second screw 503 are arranged in opposite directions to generate an overload protection mechanism. Because the second threaded hole 305 and the first threaded hole 304 have opposite directions, excessive torque will cause the first screw 501 and the second screw 503 to have a tendency to rotate relative to each other. This tendency is transmitted to the second rotating ring 302 through the third threaded hole 502, causing the second rotating ring 302 to have a tendency to rotate opposite to the first rotating ring 301. This tendency of the two rings to rotate in opposite directions increases a portion of the torque, which can increase the pressure in the hydraulic component 701 more quickly, causing the torque limiter 7 to trigger the pressure relief mechanism more quickly, and reducing the installation torque of the second screw 503. Compared with a single-screw structure, it can respond more quickly to overload conditions, further improving the protection effect of the second screw 503 in the bolt 5.

[0076] During mold disassembly, since the first threaded hole 304 and the second threaded hole 305 have opposite thread directions, disassembly only requires loosening the second screw 503 to release the self-tightening state of the twin screws. At this point, the threaded connection between the first screw 501 and the first threaded hole 304 becomes easier to disassemble because it is no longer constrained by the second screw 503, reducing the torque required for disassembly.

[0077] During the stamping process of automotive parts, the mold is subject to periodic impact loads. The combined structure of the first screw 501 and the second screw 503, through their threads with opposite directions, effectively absorbs and distributes dynamic loads. When the mold is impacted, the relative motion between the first screw 501 and the second screw 503 is converted into friction by the threads of the third threaded hole 502 and the second threaded hole 305, dissipating the impact energy and reducing the impact of the load on the overall mold structure. This damping effect improves the mold's stability under dynamic loads, helping to ensure the stamping accuracy of automotive parts.

[0078] In some examples, the thrust bearing 303 within the annular groove 102 of the mounting hole 101 significantly reduces the friction coefficient between the nut portion of the bolt 5 and the mounting member 1, allowing the applied torque to be more effectively converted into bolt preload. During the tightening process, the thrust bearing 303 allows the nut portion to rotate freely relative to the mounting member 1, reducing torque loss caused by friction in the thread pair and end face friction.

[0079] During the stamping process of automotive parts, dies are subjected to high-frequency impact loads, which can cause bolts to loosen. The use of thrust bearing 303 improves the dynamic response characteristics of bolt connections: its rolling elements absorb some of the impact energy, reducing the load's effect on the bolt preload. The low damping characteristics of rolling friction prevent the bolt from microslipping under vibration loads, reducing the risk of loosening. The thrust bearing 303 also distributes contact stress more evenly between the nut and mounting member 1, reducing the risk of fatigue fracture due to stress concentration.

[0080] The axial positioning of the thrust bearing 303 by the annular groove 102 ensures that the force applied to the bolt 5 is perpendicular to the surface of the mounting member 1, thus avoiding unbalanced loading caused by the tilting of the bolt 5. This precise axial positioning, in conjunction with the double-ring structure of the rotating member 3, further enhances the overall stability of the mold: the thrust bearing 303 and the thrust bearing 303 in the rotating member 3 jointly constrain the axial position of the bolt 5, ensuring a minimal coaxial error with the threaded hole of the rotating member 3. When the mold is subjected to lateral forces, the cooperation between the annular groove 102 and the thrust bearing 303 provides additional anti-tilting eccentric torque, enhancing the structural rigidity of the mold under complex loads and improving maintenance convenience.

[0081] During mold maintenance, the presence of thrust bearing 303 makes bolt removal easier. Because rolling friction is much less than sliding friction, the torque required to meet the maximum static friction during disassembly is significantly reduced, minimizing tool wear and operator fatigue.

[0082] In some examples, the combination of the slider 8 and the screw 9 forms a modular adjustment unit. By turning the screw 9 by rotating the handle 901, the displacement of the slider 8 can be precisely controlled. To adjust the preload of the mold's bolts, the operator can simultaneously drive multiple screws 9, causing each slider 8 to precisely displace the clamp 6, causing the teeth 306 to engage with the clamp 6. The handle 901, with the screw 9 extending outside the upper mold 2, allows the operator to adjust the position of the clamp 6 directly from outside the mold. To switch from installation mode to operating mode, simply turn the handle 901 to disengage the clamp 6 from the teeth 306 of the rotating member 3. The mode switch is completed by engaging the clamp 6 with the stop 902 via the clamp 10. At this point, when the mold is stamping, the forces generated by vibration can be released by the rotation of the rotating member 3, reducing the risk of the bolt 5 loosening. During installation, the bolt 5 can be installed and removed by engaging the clamp 6 with the teeth 306.

[0083] The clamping structure of the clamping member 10 and the limiting portion 902 forms a mechanical locking function. When the clamping member 10 is clamped with the limiting portion 902, the screw rod 9 cannot rotate, effectively preventing the screw rod 9 from loosening due to vibration during the stamping process.

[0084] In some examples, an annular retaining groove 204 is provided on each of the mold 202 and the upper cover 203. This groove, which cooperates with the cylindrical protrusion 307 of the rotating member 3, radially constrains the rotating member 3. This design eliminates the eccentricity of the rotating member caused by radial play in conventional molds, reduces the coincidence error between the axis of the bolt 5 and the axis of the threaded hole of the rotating member 3, and improves the assembly accuracy of the mold.

[0085] During the stamping process, the annular retaining groove 204 of the mold 202 and the upper cover 203 jointly constrains the cylindrical protrusion 307, forming a dual-pivot support structure that effectively resists lateral forces and overturning moments during the stamping process. The split structure of the upper mold 2 simplifies maintenance of the rotating member 3 and the thrust bearing 303. When the thrust bearing 303 needs to be replaced, simply remove the upper cover 203 and directly remove the rotating member 3 for maintenance, without disassembling the entire mold structure. During processing, the mold 202 cooperates with the lower mold 11 to perform the molding process on the workpiece.

[0086] During the continuous stamping process, frictional heat generated by the mold can cause expansion and deformation of components. The separate structure of the mold 202 and upper cover 203 allows them to expand independently during temperature changes, avoiding the deformation caused by thermal stress concentration in a monolithic structure. The clearance between the annular retaining groove 204 and the cylindrical protrusion 307 eliminates the problem of damage caused by thermal expansion of the material, ensuring that the rotating part 3 can maintain flexible rotation without binding within the normal operating temperature range of the mold.

[0087] The design of the annular retaining groove 204 and the cylindrical protrusion 307 provides a clear positioning reference for mold assembly, eliminating the need for complex centering operations during the assembly of the mold 202 and the upper cover 203. The operator simply aligns the cylindrical protrusion 307 with the annular retaining groove 204 to quickly complete the initial positioning, and then tightens the bolt 5.

[0088] In some examples, a dual anti-loosening mechanism strengthens the fit between the locking member 12 and the locking space 504. In addition to the existing anti-loosening mechanism of the first and second screws 501 and 503, a mechanical limiter structure is added. Under the high-frequency vibration environment of automotive parts stamping, the locking member 12 fits tightly into the locking space 504, effectively limiting the relative rotation between the two screws. Compared with traditional single-screw or simple thread locking methods, the probability of bolt loosening is reduced, ensuring a secure connection during long-term mold use and preventing the risk of decreased stamping accuracy and mold damage due to bolt loosening.

[0089] During the stamping process, the impact load borne by the mold can easily cause a slight displacement of the screw. The rigid contact between the retaining member 12 and the retaining space 504 can quickly absorb and disperse the lateral force and torque fluctuations on the screw, avoiding stress concentration on the threaded connection. Maintenance convenience and cost control When the mold needs to be disassembled or repaired, the removal operation of the retaining member 12 is simple and does not affect the normal disassembly process of the screw. If the retaining member 12 is worn due to long-term use, it can be replaced separately without replacing the entire bolt 5, reducing maintenance costs. At the same time, the modular design of the structure facilitates the rapid investigation and repair of loosening problems caused by vibration, reduces downtime for maintenance, and improves mold maintenance efficiency and equipment utilization.

[0090] In some examples, the clearance groove 1202 of the first clamping block 1201 precisely fits the nut of the second screw 503, and the second clamping block 1203 is embedded in the hexagonal groove of the nut of the second screw 503, forming a double mechanical lock. In the high-frequency vibration generated by the stamping of automotive parts, the surface contact structure between the second clamping block 1203 and the hexagonal groove can improve the anti-loosening efficiency compared to traditional single-point limiters, effectively inhibiting the relative rotation of the first screw 501 and the second screw 503. At the same time, the design of the clearance groove 1202 wrapping around the nut of the second screw 503 can prevent the nut from causing slight displacement due to vibration, ensuring the long-term stability of the bolted connection.

[0091] Flexible installation and adaptation solutions: The integrated or split construction of the first and second clamping blocks 1201 and 1203 provides diverse options for mold assembly. The integrated construction facilitates quick installation and is suitable for standardized production scenarios, reducing assembly steps and improving production efficiency. The split construction allows for flexible adjustment based on actual needs. When the second clamping block 1203 becomes worn, only that component needs to be replaced, without removing the integral retaining member 12, reducing maintenance costs and downtime. Furthermore, the split construction accommodates different sizes of second screw 503 nuts, enhancing the mold's versatility.

[0092] Easy installation and improved efficiency During installation, the first clamping block 1201 can be directly embedded in the locking space 504. If the second clamping block 1203 is a split structure, it can be embedded in the hexagonal groove of the nut of the second screw 503 by simple pressing or with the help of tools, which is easy to operate.

[0093] In some examples, the retaining member 12, made of elastic rubber, provides excellent cushioning performance in the high-frequency shock and vibration environments generated by the stamping of automotive parts. The elastic deformation of the rubber absorbs and disperses the instantaneous impact force on the screw. Compared to retaining members made of hard materials, this provides improved shock absorption efficiency, effectively reducing the impact of vibration on the bolted connection, preventing surface damage to the screw or nut caused by rigid impact, extending the bolt's service life, and reducing overall mold vibration and noise.

[0094] The elastic rubber retaining member 12 possesses a certain degree of flexibility, easily adapting to slight dimensional variations between the retaining space 504 and the nut of the second screw 503 during installation, thus reducing assembly difficulty. Strict control of installation precision is not required; even with dimensional deviations, the rubber retaining member will remain properly engaged and function, significantly improving installation efficiency. Furthermore, the soft texture of the rubber facilitates manual installation and removal without the need for additional tools, further streamlining the process and reducing assembly time.

[0095] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A composite die for stamping automobile parts, characterized in that: include: A mounting member (1) for connecting to the bottom of the punch; An upper mold (2), the upper mold (2) being connected below the mounting member (1), and having a mounting cavity (201) therein; A rotating member (3), the rotating member (3) is arranged in the installation cavity (201), and the rotating members (3) are arranged uniformly along the edge of the installation cavity (201). The installation member (1) is connected to the rotating member (3) via a bolt (5) passing through the top wall of the upper mold (2), and the bolt (5) is rotatably matched with the upper mold (2); A clamping member (6), the clamping member (6) being slidably disposed in the mounting cavity (201), and the clamping member (6) being capable of sliding horizontally under the rotation of the rotating member (3); A torque limiting member (7), the torque limiting member (7) being arranged in the mounting cavity (201) and connected to the clamping member (6); when the rotational torque of the bolt (5) is greater than the maximum load torque of the torque limiting member (7), the torque limiting member (7) cancels the restriction on the clamping member (6), so that the clamping member (6) slides to cooperate with the rotation of the rotating member (3), thereby preventing the bolt (5) from breaking; The torque limiting member (7) comprises: A hydraulic component (701), the hydraulic component (701) being arranged in the installation cavity (201), a slide rod (702) being slidably connected in the hydraulic component (701), the slide rod (702) being connected to the clamping component (6), a piston (703) being arranged on the slide rod (702), and the piston (703) dividing the hydraulic cavity of the hydraulic component (701) into a first oil cavity (704) and a second oil cavity (705); A pressure relief oil pipe (706) is connected to the second oil chamber (705), and a one-way pressure valve (707) is provided on the pressure relief oil pipe (706). The sliding rod (702) can open the one-way pressure valve (707) under the sliding drive of the clamp (6) to relieve the pressure of the second oil chamber (705); a reset oil pipe (708), the reset oil pipe (708) being arranged between the one-way pressure valve (707) and the second oil chamber (705) via a three-way pipe fitting, a one-way valve (709) being arranged on the reset oil pipe (708), the one-way valve (709) being capable of opening to pressurize the second oil chamber (705) and reset the clamp (6); a disassembly oil pipe (710), the disassembly oil pipe (710) being in communication with the first oil chamber (704), the disassembly oil pipe (710) being provided with a valve (711), the valve (711) being used to close the disassembly oil pipe (710) to lock the clamp (6); The rotating member (3) comprises: a first rotating ring (301), the first rotating ring (301) being rotatably disposed in the installation cavity (201); a second rotating ring (302), the second rotating ring (302) being rotatably disposed in the installation cavity (201) and located below the first rotating ring (301); A thrust bearing (303), wherein there are a plurality of thrust bearings (303), one of which is disposed between the first rotating ring (301) and the second rotating ring (302), and the first rotating ring (301) and the second rotating ring (302) are respectively in contact with the cavity wall of the installation cavity (201) via one of the thrust bearings (303); The first rotating ring (301) has a first threaded hole (304) at its center, and the second rotating ring (302) has a second threaded hole (305) at its center. The first threaded hole (304) and the second threaded hole (305) are used to connect with the bolt (5). The first rotating ring (301) and the second rotating ring (302) are both provided with toothed portions (306) on their exteriors. The clamping member (6) is a rack, and two of them are provided. The first rotating ring (301) and the second rotating ring (302) are meshed with the two clamping members (6) in a one-to-one correspondence.

2. A composite die for stamping automobile parts according to claim 1, characterized in that: The diameter of the first threaded hole (304) is greater than the diameter of the second threaded hole (305), and the bolt (5) comprises: a first screw rod (501), the first screw rod (501) passing through the mounting member (1), the thread of which is arranged in the first threaded hole (304), and the first screw rod (501) having a third threaded hole (502) coaxial with the second threaded hole (305) and having the same diameter; A second screw rod (503) is threadedly disposed in the second threaded hole (305) and the third threaded hole (502), and the second threaded hole (305) and the first threaded hole (304) have opposite thread directions.

3. The composite die for stamping automobile parts according to claim 1, characterized in that: The mounting member (1) has a mounting through hole (101), the bolt (5) passes through the mounting through hole (101), the mounting member (1) has an annular groove (102) located on the outer periphery of the upper end of the mounting through hole (101) and connected to the mounting through hole (101), the annular groove (102) is provided with a thrust bearing (303), and the nut portion of the bolt (5) abuts against the top surface of the thrust bearing (303).

4. The composite die for stamping automobile parts according to claim 1, characterized in that: Also includes: A sliding member (8), the sliding member (8) is slidably arranged in the mounting cavity (201), two clamping members (6) corresponding to one rotating member (3) are slidably arranged on one sliding member (8), and the torque limiting member (7) is arranged on the sliding member (8); A screw rod (9) is provided, wherein the screw rod (9) passes through the wall of the installation cavity (201) and is rotatably connected to the sliding member (8). After rotation, the screw rod (9) is used to drive the sliding member (8) to slide radially along the installation cavity (201). The outer end of the screw rod (9) has a handle portion (901), and the handle portion (901) has a limiting portion (902). The outer periphery of the upper mold (2) is provided with a swinging clamping member (10), and the clamping member (10) is engaged with or disengaged from the limiting portion (902) after swinging.

5. The composite die for stamping automobile parts according to claim 1, characterized in that: The upper mold (2) comprises: A mold (202), the mold (202) is used to cooperate with the lower mold (11) for stamping; An upper cover (203) is provided above the mold (202), the upper cover (203) and the mold (202) forming the mounting cavity (201), the upper cover (203) and the adjacent sides of the mold (202) each having an annular limiting groove (204), the first rotating ring (301) and the second rotating ring (302) both having a cylindrical protrusion (307), the thrust bearing (303) being provided at the bottom of the annular limiting groove (204), and the cylindrical protrusion (307) being rotatably provided in the annular limiting groove (204).

6. The composite die for stamping automobile parts according to claim 2, characterized in that: The first screw (501) is a hexagonal screw, the nut portion of the second screw (503) is located in the inner six holes of the nut portion of the first screw (501), the inner six holes have a locking space (504) formed on the outer periphery of the nut portion of the second screw (503), and further includes: A locking member (12), the locking member (12) being arranged in the locking space (504) and being used to prevent the first screw (501) and the second screw (501) from rotating relative to each other due to vibration.

7. A composite die for stamping automobile parts according to claim 6, characterized in that: The locking member (12) comprises: a first clamping block (1201), the first clamping block (1201) being arranged in the locking space (504), the first clamping block (1201) having a downwardly opening recess (1202) for accommodating a nut of the second screw rod (503); The second clamping block (1203) is connected below the first clamping block (1201) and extends downward into the hexagonal slot of the nut of the second screw rod (503). The first clamping block (1201) and the second clamping block (1203) are an integral or split structure.

8. The composite die for stamping automobile parts according to claim 7, characterized in that: The locking member (12) is an elastic rubber component.

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