Stamping die with replaceable die head

Abstract

The invention discloses a stamping die with a replaceable die head, and particularly relates to the technical field of metal stamping, the stamping die comprises a base, a supporting frame is arranged at the top of the base, a rotating workbench is arranged on one side of the supporting frame, lower die assemblies are arranged on the two sides of the rotating workbench, and an upper die frame is arranged above the rotating workbench; a rotating hinge is arranged on one side of the outer wall of the upper die frame, an upper die assembly is arranged in the upper die frame, a first ratchet wheel set is arranged on one side of the upper die assembly, a transmission assembly is arranged on one side of the first ratchet wheel set, a connecting rod is arranged above the transmission assembly, a punching pile is arranged at one end of the connecting rod, and a linkage rod is arranged below the transmission assembly. A star wheel is arranged on one side of the linkage rod, a second ratchet wheel set is arranged on one side of the star wheel, the upper portion of the second ratchet wheel set is connected with the rotary workbench, continuous four-time stamping of different lines is achieved through the four-station rotary die head and a ratchet wheel linkage mechanism, and the star wheel-ratchet wheel set achieves accurate synchronization of an upper die and a lower die in the ratio of 3: 1, and improves efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of metal stamping, and more particularly to a stamping die with a replaceable die head. Background Art

[0002] Stamping dies are tools used for stamping metal plates, bars, tubes and other materials. Through the cooperation of the punch and the die, it can realize a variety of processing operations such as punching, blanking, bending, and stretching of the plate. It has the characteristics of high precision, high efficiency and high stability, and can produce metal products of various shapes and specifications. Stamping dies are now widely used in the processing of fine objects such as badges and trademarks. However, in the stamping of precision materials such as badges and trademarks, traditional stamping dies typically use a single die head structure, which can only stamp a single pattern on the material. To achieve complex patterns, the die head must be replaced multiple times or the material must be transferred to different workstations for step-by-step stamping. After each pattern is stamped, the machine must be stopped to replace the die head or adjust the workstation, which interrupts the production process and is time-consuming and labor-intensive. Multiple positioning can easily accumulate errors, affecting the precision and consistency of the pattern.

[0003] Therefore, in response to the above problems, a stamping die with a replaceable die head is proposed. Summary of the Invention

[0004] In order to overcome the above-mentioned defects of the prior art, the present invention provides a stamping die with a replaceable die head to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a stamping die with a replaceable die head, comprising a base, a support frame is provided on the top of the base, a rotating workbench is provided on one side of the support frame, a lower die assembly is provided on both sides of the rotating workbench, an upper die frame is provided above the rotating workbench, a rotating hinge is provided on one side of the outer wall of the upper die frame, an upper die assembly is provided inside the upper die frame, a ratchet group 1 is provided on one side of the upper die assembly, a transmission assembly is provided on one side of the ratchet group 1, a connecting rod is provided above the transmission assembly, a stamping pile is provided at one end of the connecting rod, a connecting rod is provided below the transmission assembly, a star wheel is provided on one side of the connecting rod, a ratchet group 2 is provided on one side of the star wheel, and the top of the ratchet group 2 is connected to the rotating workbench.

[0006] Preferably, supporting feet are provided at the four corners of the bottom of the base, a reinforcing plate is provided at the bottom of the base, an inspection door is provided on one side of the outer wall of the reinforcing plate, and a fixing hole is provided on one side of the inspection door.

[0007] Preferably, the rotating workbench includes a dust cover, a cast iron rotating center and a fixed arm, the dust cover is provided with a cast iron rotating center inside, the bottom of the cast iron rotating center is connected to the ratchet group 2, fixed arms are provided on both sides of the cast iron rotating center, a slot is provided on one side of the fixed arm, and the fixed arm fixes the lower mold assembly through the slot, the ratchet group 2 includes a No. 2 ratchet, a latch, a motion spring and a connecting rod, a latch is provided on one side of the No. 2 ratchet, a motion spring is provided on one side of the latch, a connecting rod is provided on one side of the motion spring, and the latch is connected to the star wheel through the connecting rod.

[0008] Preferably, the lower mold assembly includes a lower mold shell, a contact layer, a honeycomb array plate, a rigid layer and a buffer layer. The contact layer is provided inside the lower mold shell, the honeycomb array plate is provided below the contact layer, the rigid layer is provided below the honeycomb array plate, the buffer layer is provided below the rigid layer, and a telescopic cylinder is provided below the lower mold shell, and the lower mold assembly can be displaced up and down along the vertical direction of the slot through the telescopic cylinder.

[0009] Preferably, the upper mold assembly includes a rotating bin, a stabilizing ring, a mold shell, a mold head, a displacement ring, a ring gasket and a compression spring. A stabilizing ring is provided inside the rotating bin. Four groups of stabilizing rings are provided, and the four groups of stabilizing rings are evenly arranged along the circumferential direction of the rotating bin. A mold shell is provided on one side of the stabilizing ring, a mold head is provided inside the mold shell, a displacement ring is provided on the outer wall of the mold head, a ring gasket is provided on one side of the displacement ring, and a compression spring is provided below the ring gasket. The displacement ring fits with the ring gasket so that the mold head can move up and down in the mold shell through the compression spring.

[0010] Preferably, a rotating shaft is provided at the center of the rotating bin, a pulley is provided on the outer wall of the rotating bin, a plug is provided on the outer wall of the mold shell, a socket is provided on one side of the plug, and a through hole is provided at the bottom of the upper mold frame, and the through hole has the same diameter as the mold head.

[0011] Preferably, the ratchet group 1 includes a ratchet No. 1, a driving wheel, a synchronous belt and a rotating motor. A driving wheel is provided below the ratchet No. 1, a synchronous belt is provided on the outer wall of the driving wheel, and the driving wheel is connected to the pulley through the synchronous belt, and a rotating motor is provided at the bottom of the driving wheel.

[0012] Preferably, the transmission assembly includes a key, a rotating shaft, an upper baffle, a lower baffle and a return spring, a rotating shaft is provided on one side of the key, an upper baffle is provided on one side of the key, a lower baffle is provided on the other side of the key, a return spring is provided at the center of the key, and the key is connected to the support frame through the return spring.

[0013] Preferably, a rotating wheel is provided at one end of the connecting rod, a convex point is provided on the outer wall of the rotating wheel, and displacement piles are provided at the four corners of the punching piles. The punching piles move up and down in the vertical direction of the four groups of displacement piles, thereby driving the rotating wheel to perform circular motion through the connecting rod, so that the convex point squeezes the upper baffle to make the card key displace along the horizontal direction of the ratchet group one, one side of the connecting rod is in contact with the lower baffle, and the connecting rod drives the star wheel to perform circular motion through the displacement of the lower baffle.

[0014] Preferably, a micro camera is provided inside the support frame, a power supply component is provided above the micro camera, and a buckle is provided on one side of the upper mold frame.

[0015] Technical effects and advantages of the present invention: Compared with the existing technology, this stamping die with replaceable die heads is designed with a circumferentially uniform distribution of four groups of replaceable die heads in the upper die assembly. Combined with the linkage of the ratchet group and the transmission assembly, the punching pile can drive the four groups of die heads to punch in sequence with one up and down movement, without the need to stop for switching. The four groups of die heads in the upper die assembly are linked with the ratchet group through the rotating bin. A single stamping action of the punching pile can trigger the die heads to switch in sequence, realizing four consecutive superimposed stampings of different textures on the same material to form a high-precision composite pattern.

[0016] Compared with the existing technology, this stamping die with a replaceable die head absorbs stamping vibrations through the honeycomb array plate and buffer layer of the lower die assembly, and cooperates with the vertical fine-tuning of the telescopic cylinder to ensure uniform pressure on the die contact surface during the stamping process and improve the clarity of the lines.

[0017] Compared with the existing technology, this stamping die with a replaceable die head rotates three times through the upper die, and the star wheel drives the ratchet group 2 through the connecting rod, driving the rotary table to automatically rotate 180°, realizing uninterrupted switching of material workstations. The meshing design of the star wheel and the ratchet group 2 enables the lower die assembly to automatically rotate 180° after the upper die completes three rotations, moving the stamped material to the unloading station, and at the same time, new material enters the stamping area, realizing seamless connection of the production rhythm.

[0018] Compared with the existing technology, the punching die with a replaceable die head converts the vertical displacement of the punching pile into the horizontal movement of the card key through the rotating wheel and the convex point, synchronously controls the ratchet group 1 and the star wheel, and realizes the rhythm synchronization of the upper and lower die movements. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall side sectional structure of the present invention.

[0020] Figure 2It is a schematic diagram of the overall three-dimensional structure of the present invention.

[0021] Figure 3 It is a partial exploded schematic diagram of the upper mold assembly of the present invention.

[0022] Figure 4 It is a partial cross-sectional structural schematic diagram of the upper mold frame and the upper mold assembly of the present invention.

[0023] Figure 5 It is a schematic diagram of a partial top view of the ratchet assembly and the transmission assembly of the present invention.

[0024] Figure 6 This is a schematic diagram of a partial cross-sectional structure of the lower mold assembly of the present invention.

[0025] Figure 7 It is a schematic diagram of the overall bottom structure of the present invention.

[0026] Figure 8 It is a schematic diagram of the linkage structure of the punch pile and the transmission assembly of the present invention.

[0027] The accompanying drawings are marked as follows: 1. base; 2. support frame; 3. rotary table; 301. dust cover; 302. cast iron rotating center; 303. fixed arm; 4. lower mold assembly; 401. lower mold shell; 402. contact layer; 403. honeycomb array plate; 404. rigid layer; 405. buffer layer; 5. upper mold frame; 6. rotary hinge; 7. upper mold assembly; 701. rotary bin; 702. stabilizing ring; 703. mold shell; 7031. plug; 7032. socket; 704. mold head; 705. displacement ring; 706. ring gasket; 707. compression spring; 8. ratchet group 1; 801. ratchet No. 1; 802. driving wheel; 803. synchronous belt; 80 4. Rotating motor; 9. Transmission assembly; 901. Key; 902. Rotating shaft; 903. Upper baffle; 904. Lower baffle; 905. Return spring; 10. Connecting rod; 11. Punching pile; 12. Linking rod; 13. Star wheel; 14. Ratchet assembly 2; 1401. Ratchet No. 2; 1402. Gear; 1403. Movement spring; 1404. Connecting rod; 15. Support foot; 16. Reinforcement plate; 17. Inspection door; 18. Fixing hole; 19. Slot; 20. Telescopic cylinder; 21. Rotating shaft; 22. Pulley; 23. Through hole; 24. Rotating wheel; 25. Bump; 26. Displacement pile; 27. Micro camera; 28. Power supply assembly; 29. ​​Buckle. DETAILED DESCRIPTION

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention. Example

[0029] As attached Figures 1 to 8 The stamping die with a replaceable die head shown in the figure includes a base 1, and is characterized in that: a support frame 2 is provided on the top of the base 1, a rotating work table 3 is provided on one side of the support frame 2, lower die assemblies 4 are provided on both sides of the rotating work table 3, an upper die frame 5 is provided above the rotating work table 3, a rotating hinge 6 is provided on one side of the outer wall of the upper die frame 5, an upper die assembly 7 is provided inside the upper die frame 5, a ratchet group 1 8 is provided on one side of the upper die assembly 7, a transmission assembly 9 is provided on one side of the ratchet group 1 8, a connecting rod 10 is provided above the transmission assembly 9, a punching pile 11 is provided at one end of the connecting rod 10, a connecting rod 12 is provided below the transmission assembly 9, a star wheel 13 is provided on one side of the connecting rod 12, a ratchet group 2 14 is provided on one side of the star wheel 13, and the top of the ratchet group 2 14 is connected to the rotating work table 3.

[0030] Specifically, the support frame 2 is welded to the top of the base 1 using Q235 steel. A cast iron rotary table 3 is mounted on its right side. This rotary table 3 forms a transmission connection with the 20CrMnTi alloy steel No. 2 ratchet 1401 of ratchet assembly 14 via a cast iron rotating core 302. The upper die frame 5 is hinged to the top of the support frame 2 via a ZG270-500 cast steel rotary hinge 6. It houses four sets of removable die heads 704, made of SKD11 die steel and quickly replaceable via a die shell 703. When the punch pile 11 is driven downward by an SMCCDQ2B pneumatic cylinder, the connecting rod 10 rotates the No. 45 steel wheel 24. Its protrusion 25 periodically squeezes the upper baffle 903 of the transmission assembly 9, pushing the 40Cr steel key 901 laterally to trigger the rotation of the drive wheel 802 of ratchet assembly 1 8. This, in turn, drives the die heads via a synchronous belt 803 to complete 90° station switching. Simultaneously, a connecting rod 12 rotates the GCr15 bearing steel star wheel 13, rotating the lower die assembly 4 180° after every three stamping strokes through a 3:1 speed ratio to change workpieces. This linkage design enables four sets of die heads 704 to cyclically stamp, continuously completing four lines on a single material, improving efficiency compared to traditional single-head dies. The star wheel 13 transmission ensures a 3:1 motion ratio between the upper and lower dies, eliminating material positioning errors. The rotating motor 804 utilizes a Panasonic MHMF092L1 servo motor, controlled by a PLC to achieve 0.1-second stamping cycle synchronization. The buffer layer 405 utilizes a polyurethane-steel composite structure, combined with compression springs 707 to create a dual-stage shock absorber, keeping stamping force fluctuations within ±5%. This precision mechanical linkage of the components successfully achieves a stacking accuracy of ≤0.05mm for precision badge workpieces, enabling integrated multi-process manufacturing without downtime for die changes.

[0031] Based on Example 1, the solution in Example 1 is further detailed in combination with the following specific working methods. Figures 1 to 8 As shown, see the following description for details: As a preferred embodiment, the four corners of the bottom of the base 1 adopt support feet 15 made of high-damping rubber material, which are rigidly connected to the threaded holes of the base through M20 bolts. A leveling screw with a scale mark is provided inside, which can be adjusted to ±5mm in height; a Q235B steel plate reinforcement plate 16 with a thickness of 20mm is welded to the bottom of the base 1. In actual application, a criss-cross reinforcement structure can be used to extend to the edge of the base to form a triangular support system with the support frame 2 column; a 300×200mm inspection door 17 is opened on one side of the reinforcement plate 16, and the door frame is made of 6061-T6 aluminum alloy profile and is equipped with a Schneider XB2B series quick-opening handle with an IP54 protection grade; the fixing holes 18 are array-type Φ18 through holes with a spacing of 100mm, and are equipped with 8.8-grade stainless steel stud bolts. The supporting foot 15 adopts a rubber-metal composite structure, which can reduce the vibration transmission rate by 75% under the working condition of a stamping frequency of 50Hz. Combined with the distributed load design of the reinforcement plate 16, the overall flatness error of the mold is less than 0.02; when the stamping pile 11 generates a 20kN impact load, the rubber layer of the supporting foot 15 is compressed and deformed to absorb the vibration. At the same time, the reinforcement plate 16 evenly transfers the load to the four corner support points through the reinforcement ribs, ensuring the positioning accuracy when the multiple mold heads 704 are switched.

[0032] As a preferred embodiment, the rotary table 3 uses a cast iron rotating core 302 as the core support component, and the material can be HT250 cast iron. The fixed arms 303 extending on both sides are made of 45 steel. In actual use, it can be rotatably installed through H-shaped spring steel buckles. The clamping slot 19 and the telescopic cylinder 20 of the lower mold assembly 4 use H-shaped spring steel buckles to achieve rapid locking and mold replacement; The second ratchet 1401 of ratchet assembly 14 and the star wheel 13 are linked: After the upper die assembly 7 completes three presses, the linkage rod 12 of the transmission assembly 9 pushes the connecting rod 1404 through the lower baffle 904, compressing the motion spring 1403 and driving the latch 1402 to engage the second ratchet 1401 and rotate 90°. The 1:2 gear ratio drives the cast iron rotor 302 to complete a 180° rotation. At this time, the rotary table 3 accurately transfers the unprocessed material to the stamping area. In actual use, this design effectively isolates metal debris through the Parker PR1540 polyurethane seal embedded in the dust cover 301. In conjunction with the fixed arm 303, the positioning error can be controlled within ±0.02mm during continuous stamping, reducing the downtime for die change compared to traditional tables. The star-wheel 13-ratchet linkage system ensures that the upper and lower dies strictly follow a 3:1 stamping-rotation rhythm. Seamless power connection is achieved through the Tsubaki chain drive system model RS35-1. This ensures that the four sets of die heads 704 always remain in the same coordinate system when completing four different texture stampings, completely eliminating the cumulative errors caused by traditional multi-station machining.

[0033] As a preferred embodiment, the contact layer 402 is made of highly elastic polyurethane, with a thickness of 5-10mm. It directly contacts the workpiece and bears the impact force, while also absorbing geometric variations in the upper die and filling different shapes through local deformation. The honeycomb array plate 403 is precision-cast, integrally formed from 6061-T6 aluminum alloy. The hexagonal hole wall thickness is 0.8mm, and the hole spacing tolerance is controlled to ±0.02mm, achieving a 35% lightweight while maintaining compressive strength. The rigid layer 404 is made of quenched and tempered S50C carbon steel and welded to the lower die shell 401 to form a rigid support. The buffer layer 405 is made of a polyurethane elastomer with a Shore hardness of 70° and is bonded to the rigid layer 404 through a hot press process, absorbing approximately 15% of the impact energy. Finite element analysis has verified that this layered structure improves stress dispersion efficiency by 42% compared to traditional monolithic dies. When stamping a 0.3mm thick copper badge, it can withstand a maximum impact pressure of 12MPa without plastic deformation. The telescopic cylinder 20 uses an SMC MKB20-20S dual-axis cylinder with a stroke accuracy of ±0.05mm. It is controlled by a PLC and linked to the host computer. After the stamping process is completed, the cylinder drives the lower mold assembly 4 vertically down 5mm along the slot 19 to release the mold. This design forms a closed-loop working system for the four lower mold assemblies 4 on the rotary table 3. Cylinder stroke compensation solves the problem of repeated positioning errors in traditional molds. Test data shows that after 1000 consecutive stamping cycles, the pattern overlay accuracy remains at ±0.03mm, more than three times the traditional structure. The die head replacement time is reduced from 15 minutes to 90 seconds.

[0034] As a preferred embodiment, the rotating bin 701 is integrally cast from stainless steel, with four groups of carbide stabilizing rings 702 evenly distributed inside along the circumferential direction. Four groups of tool steel mold shells 703 are fixed by interference fit, and each mold shell 703 is embedded with a high-speed steel or carbide mold head 704. The copper alloy displacement ring 705 arranged on the outer wall of the mold head 704 forms a buffer interface with the polyurethane ring pad 706, and cooperates with the compression spring 707 made of 60Si2Mn spring steel to form an elastic support structure. The evenly distributed structure of the four sets of stabilizing rings 702 is linked to the ratchet group 8 via pulleys 22, enabling the rotary chamber to automatically rotate 90° after each punching cycle, allowing precise switching of the die head 704. The standard plugs 7031 and sockets 7032 on the outer wall of the die shell 703 utilize HSK63 quick-change interfaces, which, combined with the guiding function of the through-hole 23, allow the die head 704 to be replaced within 30 seconds. The preload of the compression spring 707 is set to 3-5kN. At the moment of punching, the 0.5-1mm buffer stroke of the displacement ring 705 can reduce the impact load by 30%. During actual operation, when the punching pile 11 presses downward, the die head 704 continues to compress the spring 707 after contacting the material, ensuring effective transmission of the punching force while preventing overload damage to the die head 704. The four sets of die heads 704 form a continuous stamping cycle through the intermittent rotation of the rotary chamber 701. Cooperating with the 180° flip mechanism of the lower die assembly 4, the precise superposition of multiple lines of a single material is achieved, which improves efficiency compared with the traditional step-by-step stamping process.

[0035] As a preferred embodiment, a rotating shaft 21 made of 40Cr alloy steel is set at the center of the rotating bin 701, which is connected to the upper mold frame 5 through a bearing to realize circumferential rotation. An aluminum alloy pulley 22 is installed on the outer wall of the rotating bin 701 and forms a transmission connection with the drive wheel 802 through the Gates PowerGrip GT3 type synchronous belt 803; the mold shell 703 is made of SKD11 tool steel, and the 304 stainless steel plug 7031 set on its outer wall forms an interference fit with the socket 7032 on the rotating bin 701, and the mold shell can be quickly disassembled and assembled through the plug-in structure; the diameter tolerance of the through hole 23 opened at the bottom of the upper mold frame 5 is controlled at ±0.01mm, and a clearance fit is maintained with the carbide punch of the mold head 704. The technical effects of this design are reflected in the following: the synchronous belt drive between the pulley 22 and the driving wheel 802 achieves a reduction ratio of 1:4, so that the four sets of die heads 704 automatically switch work positions after the punching pile 11 completes four punchings; the conical guide structure of the plug 7031, combined with the pneumatic locking device, can complete the replacement of the die head 704 within 15 seconds with a repeat positioning accuracy of 0.02mm; the precise size design of the through hole 23 ensures that the die head 704 can freely expand and contract, and absorbs impact vibration through the polyurethane buffer layer in the ring pad 706, thereby reducing the die wear rate. In actual use, when the punching pile 11 moves downward, the protrusion 25 of the rotating wheel 24 pushes the upper baffle 903 to make the key 901 move horizontally, and synchronously drives the ratchet group 8 to rotate 36°, and drives the pulley 22 through the synchronous belt to rotate the rotating bin 701 90° to switch the mold head; at the same time, the connecting rod 12 drives the lower mold assembly 4 through the 3:1 reduction mechanism of the star wheel 13 to rotate 180° to change the work position after four stamping cycles.

[0036] As a preferred embodiment, ratchet assembly 1 8 utilizes a servo motor-driven intermittent transmission mechanism. The rotating motor 804 is preferably a Panasonic MHMF series low-inertia servo motor, secured to the inner side of the support frame 2 via a flange. The drive wheel 802 is precision-machined from 45-gauge steel, its tooth profile nitrided, creating an interference fit with the polyurethane timing belt 803. The timing belt 803 forms a closed transmission circuit with the pulley 22 on the outer wall of the rotating chamber 701. The pulley 22 is made of 7075 aluminum alloy to reduce rotational inertia. Ratchet 1 801 utilizes a modular pawl structure, comprising three sets of star-shaped pawls supported by SKF 718 / 530 angular contact ball bearings. Each 90° index triggers the insertion of a key 901 into a positioning hole, ensuring precise alignment of the four die heads 704 with the four stations of the lower die assembly. In terms of technical effectiveness, this design, through the coordinated control of a servo motor and a ratchet mechanism, achieves precise 90° rotation of the upper die assembly 7 after every three stamping strokes. Combined with the zero mark on pulley 22, the four sets of die heads 704 sequentially complete the stacking of the stamped lines. Compared to traditional gear transmissions, this structure maintains transmission errors within ±0.02mm. The elastic deformation of the timing belt 803 effectively absorbs impact loads. Combined with the hard positioning characteristics of ratchet assembly 8, this maintains high positioning accuracy during the continuous stamping process while preventing micro-displacement of the die head 704 due to rigid impact. This makes it particularly suitable for badge relief processing, which requires four stacked stamping steps.

[0037] As a preferred embodiment, key 901 is hinged to the interior of support frame 2 via shaft 902. A return spring 905 made of 60Si2Mn stainless steel spring steel is mounted horizontally, with upper and lower baffles 903 and 904 welded to its sides. When the punching pile 11 drives the connecting rod 10 via the displacement pile 26, the protrusions 25 on the outer periphery of the rotating wheel 24 compress the upper baffle 903 with each 90° rotation, forcing the key 901 to shift horizontally 3mm toward ratchet assembly 8. This forces ratchet 801 to rotate 30°. During the reset of key 901, the lower baffle 904 drives the connecting rod 12 to generate a 15mm stroke. Through the toothed interaction between the star wheel 13 and ratchet assembly 2 14, the rotary table 3 rotates 180° every three punching cycles. This structure utilizes a bidirectional baffle linkage mechanism, enabling the four-station rotation of the upper die assembly 7 and the 180° flipping of the lower die assembly 4 to achieve a precise 3:1 speed ratio, ensuring that four different pattern stampings can be completed continuously in a single clamping operation. Compared to traditional step-by-step stamping equipment, this design reduces positioning error from ±0.05mm to ±0.01mm, improving production efficiency. Furthermore, the elastic buffering provided by compression spring 707 effectively eliminates the rigid impact of die head 704 contacting the material, extending the die's service life.

[0038] As a preferred embodiment, the punch pile 11 forms a guide structure with four sets of displacement piles 26 made of 45-gauge steel and the base reinforcement plate 16. When the servo motor drives the punch pile 11 vertically downward, the connecting rod 10 drives the rotating wheel 24 into circular motion. The carbide bumps 25 embedded in the outer wall of the rotating wheel 24 squeeze the upper baffle 903 every time it rotates to the 12 o'clock position, pushing the spring steel key 901 horizontally along the ratchet assembly 8 by 3mm. At this time, the return spring 905 enters the energy storage state. When the punch pile 11 rebounds, the return spring 905 releases its elastic force, causing the key 901 to reset. This process drives the linkage rod 12 into reciprocating motion through the lower baffle 904, thereby driving the star wheel 13 to rotate 90° after completing three punching cycles. In actual use, after the upper mold assembly 7 completes three punching cycles, the star wheel drives the rotary table 3 to rotate 180° through the ratchet assembly 2 14 with precise linkage.

[0039] As a preferred embodiment, the micro camera 27 arranged horizontally inside the support frame 2 adopts the Hikvision DS-2CD3 series micro camera 27, which is fixed to the inner side of the support frame 2 column by M6 bolts, and its lens axis is at a 15° depression angle with the center line of the work station of the lower mold assembly 4. The RS485 communication port of the micro camera 27 is connected to the PLC control system via a shielded cable, and the power supply assembly 28 adopts an 18650 lithium battery pack nested in the top cavity of the support frame 2, which can be quickly replaced by a detachable buckle. The buckle 29 on the side of the upper mold frame 5 is made of 304 stainless steel and includes a spring locking mechanism to form a linkage with the rotary hinge 6. When the mold head 704 completes the four-station stamping, the electromagnet of the buckle 29 receives the signal and automatically pops open, allowing the upper mold frame to be flipped 90° around the rotary hinge for maintenance.

[0040] The present invention operates as follows: When the punching pile 11 is driven downward by external power, the four corner displacement piles 26 guide its vertical movement, driving the rotating wheel 24 to rotate via the connecting rod 10. Each time the protrusions 25 on the outer wall of the rotating wheel 24 reach a high position, they squeeze the upper baffle 903 of the transmission assembly 9, pushing the latch 901 to move laterally. This triggers the drive wheel 802 of the ratchet assembly 1 8 to rotate the pulley 22 of the upper mold assembly 7 90° via the synchronous belt 803, causing the four mold heads 704 in the rotating chamber 701 to sequentially switch to their working positions. At this point, the compression spring 707 provides buffering pressure via the displacement ring 705, and the plug 7031 of the mold shell 703 is precisely aligned with the through hole 23, completing the punching process. The synchronously moving connecting rod 12 is pushed by the lower baffle 904, forming a 3:1 transmission ratio through the star wheel 13 and the connecting rod 1404 of the second ratchet assembly 14. After completing three stamping operations, the latching teeth 1402 push the cast iron rotor 302, causing the rotary table 3 to rotate 180°. The telescopic cylinder 20 then lifts the new lower die assembly 4 to the working position. A miniature camera 27 monitors the die alignment in real time, and the locking latch 29 ensures the stable locking of the upper die frame 5. This is the operating principle of this stamping die with a replaceable die head.

Claims

1. A stamping die with a replaceable die head, comprising a base (1), characterized in that: A support frame (2) is provided on the top of the base (1), a rotary table (3) is provided on one side of the support frame (2), lower mold assemblies (4) are provided on both sides of the rotary table (3), an upper mold frame (5) is provided above the rotary table (3), a rotary hinge (6) is provided on one side of the outer wall of the upper mold frame (5), an upper mold assembly (7) is provided inside the upper mold frame (5), a ratchet group 1 (8) is provided on one side of the upper mold assembly (7), a transmission assembly (9) is provided on one side of the ratchet group 1 (8), a connecting rod (10) is provided above the transmission assembly (9), a punching pile (11) is provided at one end of the connecting rod (10), a connecting rod (12) is provided below the transmission assembly (9), a star wheel (13) is provided on one side of the connecting rod (12), a ratchet group 2 (14) is provided on one side of the star wheel (13), and the top of the ratchet group 2 (14) is connected to the rotary table (3).

2. A stamping die with a replaceable die head according to claim 1, characterized in that: Supporting feet (15) are provided at the four corners of the bottom of the base (1), a reinforcing plate (16) is provided at the bottom of the base (1), an inspection door (17) is provided on one side of the outer wall of the reinforcing plate (16), and a fixing hole (18) is provided on one side of the inspection door (17).

3. The stamping die with a replaceable die head according to claim 1, characterized in that: The rotary table (3) includes a dust cover (301), a cast iron rotating core (302) and a fixed arm (303). The dust cover (301) is provided with a cast iron rotating core (302). The bottom of the cast iron rotating core (302) is connected to the ratchet group 2 (14). Fixed arms (303) are provided on both sides of the cast iron rotating core (302). A slot (19) is provided on one side of the fixed arm (303). The fixed arm (303) fixes the lower mold group through the slot (19). Part (4), the ratchet group 2 (14) comprises a second ratchet (1401), a latching tooth (1402), a motion spring (1403) and a connecting rod (1404), the second ratchet (1401) is provided with a latching tooth (1402) on one side, a motion spring (1403) is provided on one side of the latching tooth (1402), a connecting rod (1404) is provided on one side of the motion spring (1403), and the latching tooth (1402) is connected to the star wheel (13) via the connecting rod (1404).

4. The stamping die with a replaceable die head according to claim 1, characterized in that: The lower mold assembly (4) comprises a lower mold shell (401), a contact layer (402), a honeycomb array plate (403), a rigid layer (404), and a buffer layer (405); the contact layer (402) is provided inside the lower mold shell (401); the honeycomb array plate (403) is provided below the contact layer (402); the rigid layer (404) is provided below the honeycomb array plate (403); the buffer layer (405) is provided below the rigid layer (404); a telescopic cylinder (20) is provided below the lower mold shell (401); and the lower mold assembly (4) can be displaced up and down along the vertical direction of the card slot (19) via the telescopic cylinder (20).

5. The stamping die with a replaceable die head according to claim 1, characterized in that: The upper mold assembly (7) comprises a rotating chamber (701), a stabilizing ring (702), a mold shell (703), a mold head (704), a displacement ring (705), a ring washer (706) and a compression spring (707). The interior of the rotating chamber (701) is provided with a stabilizing ring (702). The stabilizing ring (702) is provided in four groups, and the four groups of stabilizing rings (702) are evenly arranged along the circumferential direction of the rotating chamber (701). A mold shell ( 703), a mold head (704) is provided inside the mold shell (703), a displacement ring (705) is provided on the outer wall of the mold head (704), a ring pad (706) is provided on one side of the displacement ring (705), and a compression spring (707) is provided below the ring pad (706), and the displacement ring (705) fits with the ring pad (706) so that the mold head (704) can be displaced up and down in the mold shell (703) through the compression spring (707).

6. The stamping die with a replaceable die head according to claim 5, characterized in that: A rotating shaft (21) is provided at the center of the rotating bin (701), a pulley (22) is provided on the outer wall of the rotating bin (701), a plug (7031) is provided on the outer wall of the mold shell (703), a socket (7032) is provided on one side of the plug (7031), and a through hole (23) is provided at the bottom of the upper mold frame (5), and the through hole (23) has the same diameter as the mold head (704).

7. The stamping die with a replaceable die head according to claim 6, characterized in that: The ratchet assembly (8) comprises a number one ratchet (801), a driving wheel (802), a synchronous belt (803) and a rotating motor (804); the driving wheel (802) is provided below the number one ratchet (801); a synchronous belt (803) is provided on the outer wall of the driving wheel (802); the driving wheel (802) is connected to the pulley (22) via the synchronous belt (803); and a rotating motor (804) is provided at the bottom of the driving wheel (802).

8. The stamping die with a replaceable die head according to claim 1, characterized in that: The transmission assembly (9) comprises a key (901), a rotating shaft (902), an upper baffle (903), a lower baffle (904) and a return spring (905), wherein the key (901) is provided with a rotating shaft (902) on one side, the key (901) is provided with an upper baffle (903) on one side, and the key (901) is provided with a lower baffle (904) on the other side, and a return spring (905) is provided at the center of the key (901), and the key (901) is connected to the support frame (2) via the return spring (905).

9. The stamping die with a replaceable die head according to claim 8, characterized in that: A rotating wheel (24) is provided at one end of the connecting rod (10), and a convex point (25) is provided on the outer wall of the rotating wheel (24). Displacement piles (26) are provided at the four corners of the punching pile (11). The punching pile (11) moves up and down along the vertical direction of the four groups of displacement piles (26), thereby driving the rotating wheel (24) to perform circular motion through the connecting rod (10), so that the convex point (25) squeezes the upper baffle (903) to make the card key (901) move along the horizontal direction of the ratchet group (8), and one side of the connecting rod (12) is in contact with the lower baffle (904). The connecting rod (12) drives the star wheel (13) to perform circular motion through the displacement of the lower baffle (904).

10. The stamping die with a replaceable die head according to claim 1, characterized in that: A micro camera (27) is provided inside the support frame (2), a power supply assembly (28) is provided above the micro camera (27), and a buckle (29) is provided on one side of the upper mold frame (5).

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