Composite die for stamping automobile parts

Abstract

The invention relates to the technical field of dies, and provides a composite die for stamping automobile parts, which comprises a mounting part connected to the lower part of a punch, an upper die connected to the lower part of the mounting part, a mounting cavity formed in the upper die, and a plurality of rotating parts arranged in the mounting cavity and uniformly arranged along the edge of the mounting cavity, the mounting piece is connected with the rotating piece through a bolt penetrating through the top wall of the upper die, the bolt is in running fit with the upper die, the clamping piece is arranged in the mounting cavity in a sliding mode and can horizontally slide under the driving of rotation of the rotating piece, and the torque limiting piece is arranged in the mounting cavity and connected with the clamping piece. By means of the technical scheme, the technical problem that in the related technology / the prior art, when a composite die is assembled, the torque of bolts is different, so that the matching precision of stamping faces is poor after installation is solved, and the machining precision of stamping machining is improved.

Description

Technical Field

[0001] Embodiments of the present invention relate to the technical field of molds, and specifically, to a composite mold for stamping automotive parts. Background Art

[0002] In the field of stamping automotive parts, the installation accuracy and structural stability of molds directly determine the quality and production efficiency of stamped parts. During the installation of traditional composite molds, problems such as improper control of bolt torque and unreasonable installation sequence have become the key bottlenecks restricting processing accuracy and equipment reliability.

[0003] The installation of early composite molds relied on manual experience. It was difficult for operators to precisely control the torque of each bolt. Often, individual bolts would break due to excessive torque, or the levelness deviation of the mold surface would occur due to uneven torque. At the same time, the traditional installation method lacked effective torque limitation and alarm mechanisms, and could not intervene in a timely manner when operating errors occurred. It was often necessary to disassemble the mold for secondary adjustment, wasting a large amount of time and labor costs.

[0004] There are defects in the connection structure design of traditional molds. The matching accuracy between the rotating parts and the clamping parts is insufficient, and it is difficult to achieve dynamic balance of torque. During the installation process, operators usually tighten the bolts point by point instead of tightening them symmetrically in groups, resulting in uneven stress distribution inside the mold. After long-term use, problems such as bolt loosening and mold deformation are likely to occur. In addition, the rigid connection structure lacking torque limiting parts cannot adapt to the torque fluctuations caused by vibration during the stamping process, which may cause fatigue fracture of bolts and affect the continuity of the production line. Summary of the Invention

[0005] To overcome the above defects, the present invention provides a composite mold for stamping automotive parts, which solves the technical problem that the matching accuracy of the stamping surface after installation is poor due to different bolt torques during the assembly of the composite mold in the prior art.

[0006] According to one aspect, at least one embodiment of the present invention provides a composite mold for stamping automotive parts, including: A mounting member for connecting below the punch; An upper mold, the upper mold is connected below the mounting member, and an installation cavity is provided inside the upper mold; A rotating member, the rotating member is arranged in the installation cavity, the rotating member is arranged in several pieces evenly along the edge of the installation cavity, the mounting member is connected to the rotating member through a bolt penetrating the top wall of the upper mold, and the bolt is rotationally matched with the upper mold; A clamping member, the clamping member is slidably arranged in the installation cavity, and the clamping member can slide horizontally under the drive of the rotation of the rotating member; A torque limiter is disposed in the installation cavity and connected to the clamping member. When the rotational torque of the bolt is greater than the maximum load torque of the torque limiter, the torque limiter cancels the restriction on the clamping member, enabling the clamping member to slide to cooperate with the rotation of the rotating member, thereby preventing the bolt from breaking.

[0007] For example, in a composite die for stamping automotive parts provided by at least one embodiment of the present disclosure, the torque limiter includes: A hydraulic component is disposed in the installation cavity. A slide rod is slidably connected in the hydraulic component. The slide rod is connected to the clamping member. A piston is disposed on the slide rod, and the piston divides the hydraulic cavity of the hydraulic component into a first oil cavity and a second oil cavity; A pressure relief oil pipe is communicated with the second oil cavity. A one-way pressure valve is disposed on the pressure relief oil pipe. The slide rod can open the one-way pressure valve to relieve the pressure of the second oil cavity under the driving of the sliding of the clamping member; A reset oil pipe is disposed between the one-way pressure valve and the second oil cavity through a three-way pipe fitting. A one-way valve is disposed on the reset oil pipe. The one-way valve can be opened to increase the pressure of the second oil cavity and reset the clamping member; A disassembly oil pipe is communicated with the first oil cavity. A valve is disposed on the disassembly oil pipe. The valve is used to close the disassembly oil pipe to lock the clamping member.

[0008] For example, in a composite die for stamping automotive parts provided by at least one embodiment of the present disclosure, the rotating member includes: A first rotating ring is rotatably disposed in the installation cavity; A second rotating ring is rotatably disposed in the installation cavity and is located below the first rotating ring; There are a plurality of thrust bearings. One of the thrust bearings is disposed between the first rotating ring and the second rotating ring. The first rotating ring and the second rotating ring are respectively abutted against the cavity wall of the installation cavity through one of the thrust bearings; A first threaded hole is provided at the center of the first rotating ring, and a second threaded hole is provided at the center of the second rotating ring. The first threaded hole and the second threaded hole are used to connect with the bolt. Tooth portions are provided outside both the first rotating ring and the second rotating ring. The clamping member is a rack and there are two of them. The first rotating ring and the second rotating ring are respectively meshed with the two clamping members in a one-to-one correspondence.

[0009] For example, in a composite die for stamping automotive parts provided by at least one embodiment of the present disclosure, the diameter of the first threaded hole is greater than the diameter of the second threaded hole. The bolt includes: The first screw rod, the first screw rod penetrates through the mounting member, is threadedly arranged in the first threaded hole, and the first screw rod has a third threaded hole coaxial with and having the same diameter as the second threaded hole; The second screw rod, the second screw rod is threadedly arranged in the second threaded hole and the third threaded hole, and the thread directions of the second threaded hole and the first threaded hole are opposite.

[0010] For example, a compound die for stamping automotive parts provided by at least one embodiment of the present disclosure, the mounting member has a mounting through hole, the bolt penetrates through the mounting through hole, the mounting member has an annular groove portion located on the outer periphery of the upper end of the mounting through hole and communicating with 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.

[0011] For example, a compound die for stamping automotive parts provided by at least one embodiment of the present disclosure further includes: The 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; The lead screw, the lead screw penetrates through the cavity wall of the mounting cavity and is rotatably connected to the sliding member, and is used to drive the sliding member to slide radially along the mounting cavity after rotation. The outer end of the lead screw has a handle portion, the handle portion has a limiting portion, a clamping member that swings is arranged on the outer periphery of the upper die, and the clamping member is clamped or unclamped with the limiting portion after swinging.

[0012] For example, a compound die for stamping automotive parts provided by at least one embodiment of the present disclosure, the upper die includes: The die, the die is used to cooperate with the lower die for stamping; The upper cover, the upper cover is arranged above the die, the upper cover and the die form the mounting cavity, the adjacent sides of the upper cover and the die respectively have an annular limiting groove, the first rotating ring and the second rotating ring both have cylindrical protrusions, the thrust bearing is arranged at the bottom of the annular limiting groove, and the cylindrical protrusions are rotatably arranged in the annular limiting groove.

[0013] For example, a compound die for stamping automotive parts provided by at least one embodiment of the present disclosure, the first screw rod is an internal hexagonal screw rod, the nut portion of the second screw rod is located in the internal hexagonal hole of the nut portion of the first screw rod, a clamping space formed on the outer periphery of the nut portion of the second screw rod is arranged in the internal hexagonal hole, and further includes: The clamping member, the clamping member is arranged in the clamping space and is used to prevent the relative rotation of the first screw rod and the first screw rod caused by vibration.

[0014] For example, a compound die for stamping automotive parts provided by at least one embodiment of the present disclosure, the locking member includes: A first clamping block, the first clamping block is arranged in the clamping space, and the first clamping block has a downward-opening relief groove for accommodating the nut of the second screw; A second clamping block, 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, and the first clamping block and the second clamping block are of an integral or split structure.

[0015] For example, a compound die for stamping automotive parts provided by at least one embodiment of the present disclosure, the material of the locking member is an elastic rubber member.

[0016] The beneficial effects of the embodiments of the present invention are as follows: In the present invention, the edge of the installation cavity is equidistant from the edge of the upper die, and the rotating members are evenly distributed on the upper surface of the upper die. Combining with the operation specification of tightening the bolts in diagonal groups, it enables the installer to more intuitively follow the principle of symmetric tightening during the tightening process, ensuring uniform force in the connection between the upper die and the installation member, effectively reducing the problem of stress concentration in the die structure caused by improper installation sequence, and improving the installation efficiency and accuracy.

[0017] Under normal installation conditions, the rotating member cooperates with the clamping member to keep the clamping member in a fixed state, and the torque limiting member maintains the limitation of the rotation torque of the bolt, ensuring the stable connection between the installation member and the upper die through the bolt, realizing the reliable assembly of the die, and guaranteeing the stability of the die structure during the stamping process of automotive parts.

[0018] When the installer tightens the bolt and the applied rotation torque is too large due to an operation error, the torque limiting member cancels the limitation after receiving the excessive pressure transmitted by the clamping member. The clamping member slides under the action of the rotating member, and the rotating member then rotates in the installation cavity, avoiding the bolt from breaking due to excessive torque, and effectively preventing the installation torque difference of several bolts between the upper die and the installation member from being too large, ensuring the consistency and reliability of the die installation.

[0019] When the operator at a certain point makes a misoperation resulting in excessive bolt torque, the bolt drives the rotating member to rotate synchronously, and this abnormal rotation breaks through the set range of the torque limiting member. At this time, the torque limiting member triggers an alarm mechanism to timely prompt the operator to stop the current operation in the form of sound, light, etc., and then proceed to tighten the next bolt, avoiding the damage risk caused by over-tightening a single bolt, and realizing the intelligent monitoring and active protection of the installation process.

[0020] Through the synergistic effect of the rotating member, the torque limiting member and the installation operation specifications, the chain reaction caused by excessive torque of individual bolts is effectively avoided, ensuring that the installation torque of each bolt is within a reasonable range and the difference between them is extremely small. Even in a complex scenario of multi-person collaborative installation, the stability and reliability of the connection between the upper die and the installation part can be guaranteed.

[0021] By controlling the torque, the surface flatness of the upper die is guaranteed, thus ensuring the stamping quality during the stamping process, avoiding stamping errors caused by different bolt torques, and improving the product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments of the present invention. Obviously, the following described drawings are only some exemplary embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the content of the exemplary embodiments of the present invention and these drawings.

[0023] Figure 1 It is a schematic structural diagram of an embodiment of the present invention; Figure 2 For Figure 1 the front view structural schematic diagram of the embodiment of; Figure 3 For Figure 2 the sectional structural schematic diagram of A-A in; Figure 4 For Figure 3 the enlarged structural schematic diagram of B in; Figure 5 For Figure 1 the enlarged structural schematic diagram of C in; Figure 6 For Figure 1 the structural schematic diagram of the installation cavity in the embodiment of; Figure 7 For Figure 1 the principle schematic diagram of the torque limiting member in the embodiment of; In the figure: mounting member - 1, mounting through - hole - 101, annular groove portion - 102, upper die - 2, mounting cavity - 201, die - mold - 202, upper cover - 203, annular limiting groove - 204, rotating member - 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 rod - 501, third threaded hole - 502, second screw rod - 503, locking space - 504, locking member - 6, torque limiting member - 7, hydraulic member - 701, slide bar - 702, piston - 703, first oil cavity - 704, second oil cavity - 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 member - 8, lead screw - 9, handle portion - 901, limiting portion - 902, clamping member - 10, lower die - 11, locking member - 12, first clamping block - 1201, relief groove - 1202, second clamping block - 1203. Detailed implementation mode

[0024] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention.

[0025] For the sake of simplicity of the drawings, only the parts related to the invention are schematically shown in each drawing, and they do not represent the actual structure of the product. In addition, for the sake of simplicity and easy understanding of the drawings, in some drawings, parts with the same structure or function are only schematically shown for one of them, or only one of them is marked. In this article, "one" not only means "only this one", but also means "more than one" situation, and "several" includes "two" and "more than two".

[0026] In this article, it should be noted that unless otherwise clearly specified and limited, the terms "mount", "connect", and "couple" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0027] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include direct contact between the first and second features, or may include the first and second features not being in direct contact but being in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "under" and "beneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is less than that of the second feature.

[0028] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "left" and "right" are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0029] In addition, in the description of this application, the terms "first", "second", etc. are only used for distinguishing descriptions, and cannot be construed as indicating or implying relative importance.

[0030] As Figures 1 to 7 shown, it shows a compound die for stamping automotive parts in an embodiment of the present invention.

[0031] In some examples, the edge of the installation cavity 201 is equidistantly arranged from the edge of the upper die 2, and the rotating parts 3 are evenly distributed on the upper surface of the upper die 2. In line with the operation specification of tightening the bolts 5 in diagonal groups, it enables the installer to more intuitively follow the principle of symmetric tightening during the tightening process, ensuring uniform force in the connection between the upper die 2 and the installation part 1, effectively reducing the problem of stress concentration in the die structure caused by improper installation sequence, and improving the installation efficiency and accuracy.

[0032] Under normal installation conditions, the rotating parts 3 cooperate with the clamping parts 6 to keep the clamping parts 6 in a fixed state, and the torque limiting parts 7 maintain the limitation of the rotation torque of the bolts 5, ensuring the stable connection between the installation part 1 and the upper die 2 through the bolts 5, realizing the reliable assembly of the die, and guaranteeing the stability of the die structure during the stamping process of automotive parts.

[0033] When the installer tightens the bolts 5 and due to an operation error, the applied rotation torque is too large, the torque limiting parts 7 cancel the limitation after receiving the excessive pressure transmitted by the clamping parts 6, the clamping parts 6 slide under the action of the rotating parts 3, and the rotating parts 3 then rotate in the installation cavity 201, avoiding the breakage of the bolts 5 due to excessive torque, and at the same time effectively preventing too large a difference in the installation torque of several bolts 5 between the upper die 2 and the installation part 1, ensuring the consistency and reliability of the die installation.

[0034] When the operator at a certain point makes a misoperation, resulting in excessive torque of the bolt 5, the bolt 5 drives the rotating part 3 to rotate synchronously, and this abnormal rotation breaks through the set range of the torque limiting part 7. At this time, the torque limiting part 7 triggers the alarm mechanism to timely prompt the operator to stop the current operation by means of sound, light, etc., and then proceed to tighten the next bolt 5, avoiding the damage risk caused by over-tightening of a single bolt and realizing the intelligent monitoring and active protection of the installation process.

[0035] Through the synergistic effect of the rotating part 3, the torque limiting part 7 and the installation operation specifications, the chain reaction caused by excessive torque of individual bolts is effectively avoided, ensuring that the installation torques of all bolts 5 are within a reasonable range and the difference between them is extremely small. Even in a complex scenario of multi-person collaborative installation, the stability and reliability of the connection between the upper die 2 and the installation part 1 can be guaranteed.

[0036] By controlling the torque, the surface flatness of the upper die 2 is guaranteed, thus ensuring the stamping quality during the stamping process, avoiding the stamping error caused by different torques of the bolts 5, and improving the product quality.

[0037] In some examples, under normal installation conditions, the slide rod 702 of the hydraulic part 701 and the piston 703 remain in a stable state, the hydraulic oil pressures in the first oil chamber 704 and the second oil chamber 705 are balanced, the one-way pressure valve 707 is closed, and the one-way valve 709 on the return oil pipe 708 prevents the hydraulic oil from flowing back, ensuring the effective limitation of the rotating torque of the bolt 5 by the torque limiting part 7. The clamping part 6 remains fixed under the cooperation of the rotating part 3, enabling the installation part 1 and the upper die 2 to be firmly connected by the bolt 5, providing a stable and reliable die structure for the stamping processing of auto parts.

[0038] When the rotation torque of the bolt 5 is too large, the excessive pressure is transmitted to the hydraulic component 701 through the clamping member 6, pushing the piston 703 on the sliding rod 702 to move, so that the hydraulic oil pressure in the second oil chamber 705 increases. When the pressure exceeds the set threshold of the one-way pressure valve 707, the one-way pressure valve 707 opens, and the hydraulic oil in the second oil chamber 705 is discharged through the pressure relief oil pipe 706, and the torque limiting member 7 cancels the limit. At this time, the clamping member 6 slides under the action of the rotating member 3, and the rotating member 3 rotates in the installation cavity 201, avoiding the bolt 5 from breaking due to overload, and at the same time preventing the installation torques of the bolts 5 from differing too much, ensuring the installation quality of the mold. During the mold disassembly process, the valve 711 on the disassembly oil pipe 710 is closed, and the hydraulic oil in the first oil chamber 704 cannot be discharged through the disassembly oil pipe 710. The resistance of the hydraulic component 701 is constant, and the hydraulic component 701 has no action, enabling the clamping member 6 and the rotating member 3 to act in coordination, and the rotating member 3 does not rotate flexibly in the installation cavity 201, ensuring the smooth disassembly of the bolt 5 and reducing the damage to the mold components during disassembly. After the disassembly is completed, the valve 711 is opened, and the hydraulic component 701 can enter the hydraulic oil through the reset oil pipe 708 by using the one-way valve 709 to reset the piston 703, making preparations for the next use and improving the mold maintenance efficiency and service life.

[0039] 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 that the first rotating ring 301 and the second rotating ring 302 can achieve relative rotation. The first rotating ring 301 and the second rotating ring 302 are respectively in contact with the upper and lower cavity walls of the installation cavity 201 through a thrust bearing 303 to achieve rotation in the installation cavity 201. The setting of the thrust bearing 303 effectively reduces the rotation resistance, ensuring that the first rotating ring 301 and the second rotating ring 302 can rotate synchronously and smoothly during the tightening process of the bolt 5. The meshing relationship between the tooth part 306 and the clamping member 6 (rack) enables the rotating member 3 and the clamping member 6 to form a stable linkage. The clamping member 6 is fixed under the constraint of the torque limiting member 7, and then the installation torque of the bolt 5 is accurately limited within the set range through the rotating member 3, providing reliable connection strength for the mold.

[0040] When the rotational torque of the bolt 5 is too large, the hydraulic system of the torque limiting member 7 is triggered (the opening of the one-way pressure valve 707 is caused by the increase in the pressure of the second oil chamber 705), and the clamping member 6 loses its restraint and starts to slide. At this time, the tooth portions 306 outside the first rotating ring 301 and the second rotating ring 302 cooperate with the rack structure of the clamping member 6, enabling the rotating member 3 to quickly convert the overload torque of the bolt 5 into its own rotational kinetic energy. Since a thrust bearing 303 is provided between the first rotating ring 301 and the second rotating ring 302 to ensure that the first rotating ring 301 and the second rotating ring 302 can rotate relative to each other, the first rotating ring 301 and the second rotating ring 302 are respectively abutted against the upper and lower cavity walls of the installation cavity 201 through a thrust bearing 303. This double-ring structure design makes the rotation smoother, effectively disperses the overload stress, and prevents the bolt 5 from breaking due to local stress concentration. At the same time, the thrust bearing 303 between the double rings further enhances the structural stability, ensuring that the rotating member 3 can still maintain coaxial rotation under overload conditions and preventing jamming.

[0041] During the mold disassembly process, the valve 711 on the disassembly oil pipe 710 is closed, the resistance of the hydraulic member 701 increases, and the clamping member 6 cannot slide. At this time, when the operator loosens the bolt 5, the first rotating ring 301 and the second rotating ring 302 cannot rotate under the support of the thrust bearing 303, and the meshing relationship between the tooth portions 306 and the clamping member 6 ensures the fixed position. After the disassembly is completed, the valve 711 is opened, the hydraulic member 701 is reset, and the clamping member 6 re-restrains the rotating member 3. Due to the low friction characteristic of the thrust bearing 303, the rotating member 3 can quickly stop rotating and be accurately positioned, preparing for the next installation, and significantly improving the maintenance efficiency of the mold.

[0042] The double-ring design of the first rotating ring 301 and the second rotating ring 302, in cooperation with the thrust bearing 303, significantly enhances the anti-eccentricity ability of the rotating member 3 when cooperating with the bolt 5 compared with the traditional single-ring structure, ensuring that even under the action of an eccentric force during the installation of the bolt 5, it can be quickly detected and adjusted, avoiding uneven torque transmission caused by eccentricity. The meshing structure of the tooth portions 306 and the rack of the clamping member 6 provides accurate motion transmission, making the restraint of the torque limiting member 7 on the rotating member 3 more reliable.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] During the stamping process of automotive parts, the die is subjected to periodic impact loads. The combined structure of the first screw 501 and the second screw 503 can effectively absorb and disperse dynamic loads through the thread fit with opposite helix directions. When the die is impacted, the relative movement tendency between the first screw 501 and the second screw 503 will be converted into frictional force by the thread constraints of the third threaded hole 502 and the second threaded hole 305, consuming the impact energy and reducing the influence of the load on the overall structure of the die. This damping effect improves the stability of the die under dynamic loads and helps to ensure the stamping accuracy of automotive parts.

[0048] In some examples, the thrust bearing 303 in the annular groove portion 102 of the mounting through-hole 101 significantly reduces the friction coefficient between the nut portion of the bolt 5 and the mounting member 1, enabling the applied torque to be more effectively converted into bolt pre-tightening force. During the tightening process, the thrust bearing 303 allows the nut portion to rotate freely relative to the mounting member 1, reducing the torque loss caused by the friction of the thread pair and the end face friction.

[0049] During the stamping process of automotive parts, the die bears high-frequency impact loads, which may cause the bolts to loosen. The application of the thrust bearing 303 improves the dynamic response characteristics of the bolt connection: the rolling elements of the thrust bearing 303 can absorb part of the impact energy, reducing the influence of the load on the bolt pre-tightening force; the low-damping characteristic of rolling friction makes the bolts less likely to produce micro-slip under vibration loads, reducing the risk of loosening; the thrust bearing 303 makes the contact stress distribution between the nut portion and the mounting member 1 more uniform, reducing the risk of fatigue fracture caused by stress concentration.

[0050] The axial positioning effect of the annular groove portion 102 on the thrust bearing 303 ensures that the force direction of the bolt 5 is perpendicular to the surface of the mounting member 1, avoiding the eccentric load problem caused by the inclination of the bolt 5. This precise axial positioning and the double-ring structure of the rotating member 3 work together to further improve the overall stability of the die: the thrust bearings 303 in the thrust bearing 303 and the rotating member 3 jointly restrict the axis position of the bolt 5 to ensure that the coaxiality error with the threaded hole of the rotating member 3 is small; when the die is subjected to a lateral force, the cooperation between the annular groove portion 102 and the thrust bearing 303 can provide an additional anti-tilting eccentric moment, enhancing the structural stiffness of the die under complex loads and improving the maintenance convenience.

[0051] During the die maintenance process, the presence of the thrust bearing 303 makes the bolt disassembly easier. Since the rolling friction resistance is much smaller than the sliding friction, the torque required for the maximum static friction force during disassembly is significantly reduced, reducing tool wear and the physical exertion of the operator.

[0052] In some examples, the combined design of the slider 8 and the lead screw 9 forms a modular adjustment unit. By rotating the handle part 901 to drive the rotation of the lead screw 9, the displacement of the slider 8 can be precisely controlled. When it is necessary to adjust the bolt pre-tightening force of the mold, the operator can synchronously drive multiple lead screws 9, so that each slider 8 drives the clamping part 6 to displace precisely, making the tooth part 306 mesh with the clamping part 6. The design of the handle part 901 where the lead screw 9 extends to the outside of the upper die 2 enables the operator to directly adjust the position of the clamping part 6 outside the mold. When it is necessary to switch from the installation mode to the working mode, just rotate the handle part 901 to separate the clamping part 6 from the tooth part 306 of the rotating part 3, and then engage and lock the clamping part 10 with the limiting part 902 to complete the mode switch. At this time, when the mold is performing stamping processing, the force generated by vibration can be released through the rotation of the rotating part 3, thereby reducing the risk of loosening of the bolt 5. During installation, making the clamping part 6 mesh with the tooth part 306 can achieve the disassembly and assembly of the bolt 5.

[0053] The clamping structure of the clamping part 10 and the limiting part 902 forms a mechanical locking function. When the clamping part 10 is clamped with the limiting part 902, the lead screw 9 cannot rotate, effectively preventing the loosening of the lead screw 9 caused by vibration during the stamping process.

[0054] In some examples, an annular limiting groove 204 is respectively arranged on the mold 202 and the upper cover 203. By cooperating with the cylindrical protrusion 307 of the rotating part 3, the radial constraint of the rotating part 3 is realized. This design eliminates the eccentricity caused by the radial clearance of the rotating parts in the traditional mold, reduces the coincidence error between the axis of the bolt 5 and the axis of the threaded hole of the rotating part 3, and improves the assembly accuracy of the mold.

[0055] During the stamping process, the annular limiting grooves 204 of the mold 202 and the upper cover 203 jointly restrain the cylindrical protrusion 307 to form a double-pivot support structure, effectively resisting the lateral force and overturning moment during the stamping process. The split structure of the upper die 2 makes the maintenance of the rotating part 3 and the thrust bearing 303 simple. When it is necessary to replace the thrust bearing 303, just disassemble the upper cover 203, and then the rotating part 3 can be directly taken out for maintenance without disassembling the entire mold structure. During processing, the mold 202 cooperates with the lower die 11 to perform die pressing on the workpiece to be processed.

[0056] During continuous stamping, the mold may expand and deform due to heat generated by friction. The split structure of the mold 202 and the upper cover 203 allows the two to expand independently when the temperature changes, avoiding the deformation problem caused by thermal stress concentration in the integral structure. The design of the clearance between the annular limiting groove 204 and the cylindrical protrusion 307 solves the damage problem caused by thermal expansion of the material, ensuring that the rotating part 3 can still rotate flexibly without jamming within the normal working temperature range of the mold.

[0057] The design of the annular limiting groove 204 and the cylindrical protrusion 307 provides a clear positioning reference for the die assembly, enabling the assembly process of the die 202 and the upper cover 203 without complex centering operations. The operator only needs to align the cylindrical protrusion 307 with the annular limiting groove 204 to quickly complete the preliminary positioning, and then fasten it with the bolt 5.

[0058] In some examples, the double anti-loosening mechanism strengthens the cooperation between the locking part 12 and the locking space 504. Based on the original anti-loosening of the first screw 501 and the second screw 503 with opposite thread directions, a mechanical limiting structure is added. In the high-frequency vibration environment of automotive parts stamping, the locking part 12 tightly fits into the locking space 504, effectively restricting the relative rotation between the two screws. Compared with the traditional single screw or simple thread anti-loosening methods, the probability of bolt loosening is reduced, ensuring the stable connection of the die during long-term use and avoiding the risk of reduced stamping accuracy and die damage caused by bolt loosening.

[0059] Enhanced During the stamping process, the impact load borne by the die is likely to cause minor displacements of the screws. The rigid contact between the locking part 12 and the locking space 504 can quickly absorb and disperse the lateral force and torque fluctuations received by the screws, avoiding stress concentration at the thread connection. Maintenance convenience and cost control When the die needs to be disassembled or repaired, the removal operation of the locking part 12 is simple and does not affect the normal disassembly process of the screws. If the locking part 12 is worn due to long-term use, it can be replaced separately without replacing the entire bolt 5, reducing the maintenance cost. At the same time, the modular design of this structure facilitates the quick troubleshooting and repair of loosening problems caused by vibration, reducing the downtime for maintenance and improving the die maintenance efficiency and equipment utilization rate.

[0060] In some examples, the relief groove 1202 of the first block 1201 is precisely adapted to the nut of the second screw 503, and the second block 1203 is inserted into the hexagonal groove of the nut of the second screw 503 to form a double mechanical lock. In the high-frequency vibration generated by automotive parts stamping, the surface contact structure between the second block 1203 and the hexagonal groove can improve the anti-loosening efficiency compared with the traditional single-point limit, effectively suppressing the relative rotation between the first screw 501 and the second screw 503. At the same time, the wrapping design of the relief groove 1202 for the nut of the second screw 503 can prevent the nut from having minor displacements due to vibration, ensuring the long-term stability of the bolt connection.

[0061] The integrated or split structure of the first clamping block 1201 and the second clamping block 1203 in the flexible installation adaptation solution provides diversified choices for mold assembly. The integrated structure is convenient for quick installation, suitable for standardized production scenarios, can reduce the assembly steps and improve production efficiency; the split structure can be flexibly adjusted according to actual needs. When the second clamping block 1203 is worn, only this component needs to be replaced separately, without disassembling the overall clamping part 12, reducing the maintenance cost and downtime. In addition, the split structure can also adapt to second screw 503 nuts of different specifications, enhancing the versatility of the mold.

[0062] Convenient installation and efficiency improvement During installation, the first clamping block 1201 can be directly embedded into the clamping space 504. If the second clamping block 1203 is of split structure, it can be simply pressed or assisted by tools to be embedded into the hexagonal groove of the second screw 503 nut, with simple operation.

[0063] In some examples, the clamping part 12 made of elastic rubber can exhibit excellent buffering performance in the high-frequency impact and vibration environment generated by automotive parts stamping. The elastic deformation of the rubber can absorb and disperse the instantaneous impact force received by the screw. Compared with the clamping part made of hard materials, its shock absorption efficiency is improved, effectively reducing the impact of vibration on the bolt connection part, avoiding surface damage of the screw or nut caused by rigid collision, prolonging the service life of the bolt, and at the same time reducing the overall vibration noise of the mold.

[0064] The clamping part 12 made of elastic rubber has a certain flexibility and can easily adapt to the small size errors of the clamping space 504 and the second screw 503 nut during the installation process, reducing the assembly difficulty. There is no need to strictly control the installation accuracy. Even if there are size deviations, the rubber clamping part can still be normally embedded and function, significantly improving the installation efficiency. At the same time, the soft texture of the rubber is convenient for manual installation or disassembly without additional tools, further simplifying the operation process and saving assembly time.

[0065] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not restrictive. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A composite die for stamping automotive parts, characterized in that, Comprising: A mounting member (1) for connecting below the punch; An upper die (2), the upper die (2) being connected below the mounting member (1), and the upper die (2) having a mounting cavity (201) therein; A rotating member (3), the rotating member (3) being arranged in the mounting cavity (201), the rotating member (3) being a plurality of evenly arranged along the edge of the mounting cavity (201), and the mounting member (1) being connected to the rotating member (3) by a bolt (5) passing through the top wall of the upper die (2), and the bolt (5) being rotationally matched with the upper die (2); A clamping member (6), the clamping member (6) being slidably arranged in the mounting cavity (201), and the clamping member (6) being capable of horizontally sliding under the drive of 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.

2. The composite die for stamping automotive parts according to claim 1, characterized in that, The torque limiting member (7) includes: A hydraulic member (701), the hydraulic member (701) being arranged in the mounting cavity (201), a sliding rod (702) being slidably connected in the hydraulic member (701), the sliding rod (702) being connected to the clamping member (6), a piston (703) being arranged on the sliding rod (702), and the piston (703) dividing the hydraulic cavity of the hydraulic member (701) into a first oil cavity (704) and a second oil cavity (705); A pressure relief oil pipe (706) communicating with the second oil cavity (705), a one-way pressure valve (707) being arranged on the pressure relief oil pipe (706), and the sliding rod (702) being capable of opening the one-way pressure valve (707) to relieve pressure on the second oil cavity (705) under the driving of the sliding of the clamping member (6); A return oil pipe (708), the return oil pipe (708) being arranged between the one-way pressure valve (707) and the second oil cavity (705) through a tee pipe fitting, a one-way valve (709) being arranged on the return oil pipe (708), and the one-way valve (709) being capable of opening to pressurize the second oil cavity (705) and reset the clamping member (6); A disassembly oil pipe (710), the disassembly oil pipe (710) communicating with the first oil cavity (704), a valve (711) being arranged on the disassembly oil pipe (710), and the valve (711) being used to close the disassembly oil pipe (710) to lock the clamping member (6).

3. A composite die for stamping automotive parts according to claim 1, characterized in that, The rotating member (3) includes: A first rotating ring (301), the first rotating ring (301) being rotatably arranged in the mounting cavity (201); A second rotating ring (302), the second rotating ring (302) being rotatably arranged in the mounting cavity (201) and located below the first rotating ring (301); Thrust bearings (303), with a number of the thrust bearings (303). One of the thrust bearings (303) is disposed between the first rotating ring (301) and the second rotating ring (302). The first rotating ring (301) and the second rotating ring (302) are respectively in contact with the cavity wall of the installation cavity (201) through one of the thrust bearings (303). At the center of the first rotating ring (301) there is a first threaded hole (304), and at the center of the second rotating ring (302) there is a second threaded hole (305). The first threaded hole (304) and the second threaded hole (305) are used to connect with the bolt (5). Tooth portions (306) are provided outside both the first rotating ring (301) and the second rotating ring (302). The clamping members (6) are racks and there are two of them. The first rotating ring (301) and the second rotating ring (302) are respectively engaged with the two clamping members (6) in a one-to-one correspondence.

4. The composite die for stamping automotive parts according to claim 3, characterized in that, The diameter of the first threaded hole (304) is larger than the diameter of the second threaded hole (305). The bolt (5) includes: A first screw rod (501), the first screw rod (501) penetrates through the installation member (1) and is threadedly arranged in the first threaded hole (304). The first screw rod (501) has a third threaded hole (502) that is coaxial with and has the same diameter as the second threaded hole (305). A second screw rod (503), the second screw rod (503) is threadedly arranged in the second threaded hole (305) and the third threaded hole (502). The screw directions of the second threaded hole (305) and the first threaded hole (304) are opposite.

5. The composite die for stamping automotive parts according to claim 3, wherein, The installation member (1) has an installation through hole (101), the bolt (5) penetrates through the installation through hole (101). On the installation member (1), there is an annular groove portion (102) located on the outer periphery of the upper end of the installation through hole (101) and communicating with the installation through hole (101). One of the thrust bearings (303) is provided in the annular groove portion (102). The nut portion of the bolt (5) is in contact with the top surface of the thrust bearing (303).

6. The composite die for stamping automotive parts according to claim 3, characterized in that, It further includes: A sliding member (8), the sliding member (8) is slidably arranged in the installation cavity (201). Two of the clamping members (6) corresponding to one rotating member (3) are slidably arranged on one sliding member (8). The torque limiting member (7) is arranged on the sliding member (8); A lead screw (9), the lead screw (9) penetrates through the cavity wall of the installation cavity (201) and is rotatably connected to the sliding member (8). After rotation, it is used to drive the sliding member (8) to slide radially along the installation cavity (201). The outer end of the lead screw (9) has a handle portion (901). The handle portion (901) has a limiting portion (902). A swingable clamping member (10) is arranged on the outer periphery of the upper die (2). After the clamping member (10) swings, it is clamped or unclamped with the limiting portion (902).

7. A compound die for stamping automotive parts according to claim 3, characterized in that, The upper die (2) includes: A mold (202) for cooperating with a lower mold (11) to perform stamping; An upper cover (203) disposed above the mold (202). The upper cover (203) and the mold (202) form the installation cavity (201). Adjacent sides of the upper cover (203) and the mold (202) respectively have an annular limiting groove (204). The first rotating ring (301) and the second rotating ring (302) both have cylindrical protrusions (307). The thrust bearing (303) is disposed at the bottom of the annular limiting groove (204), and the cylindrical protrusions (307) are rotatably disposed in the annular limiting groove (204).

8. A composite die for stamping automotive parts according to claim 4, characterized in that, The first screw (501) is an internal hexagonal screw. The nut portion of the second screw (503) is located in the internal hexagonal hole of the nut portion of the first screw (501). A locking space (504) formed on the outer periphery of the nut portion of the second screw (503) is provided in the internal hexagonal hole. Further included is: A locking member (12) disposed in the locking space (504) for preventing relative rotation between the first screw (501) and the second screw (501) caused by vibration.

9. A composite die for stamping automotive parts according to claim 8, characterized in that, The locking member (12) includes: A first clamping block (1201) disposed in the locking space (504). The first clamping block (1201) has a downward-opening relief groove (1202) for accommodating the nut of the second screw (503). A second clamping block (1203) connected to the lower part of the first clamping block (1201) and extending downward into the hexagonal groove of the nut of the second screw (503). The first clamping block (1201) and the second clamping block (1203) are of an integral or split structure.

10. The composite die for stamping automotive parts according to claim 9, wherein, The locking member (12) is an elastic rubber member.

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