Continuous stamping die set and stamping process for stamping parts

Abstract

The invention relates to the technical field of stamping dies, in particular to a continuous stamping die set and stamping process for stamping parts, which comprises a machine body and a vibration energy absorption block, a lower die holder is fixedly arranged on the machine body, an upper die holder is slidably arranged on the machine body, and a plurality of stations are arranged between the upper die holder and the lower die holder. Wherein the machine body comprises a first station generating impact vibration and a second station affected by vibration, and the machine body is further provided with a driving assembly driving the upper die base to move up and down; the vibration energy absorption block is a metal insert, the metal insert is arranged in the lower die base and located on a vibration propagation path between a first station generating impact vibration and a second station affected by vibration, and a geometric structure used for guiding and dissipating vibration waves is arranged on the metal insert. The high-speed stamping device has the advantages that vibration energy crosstalk of an impact station to a precision station in the high-speed stamping process can be eliminated fundamentally, and therefore the production quality of workpieces is guaranteed.

Description

Technical Field

[0001] This application relates to the technical field of stamping dies, and in particular to a continuous stamping die assembly and stamping process for stamped parts. Background Technology

[0002] In the production process of progressive dies, multiple stamping stations are integrated into a single die. Multiple processing steps are completed simultaneously in each stroke of the press through the step-by-step feeding of the rolled material. To improve the structural rigidity of parts or achieve specific assembly functions, the process often includes processes such as "flattening." These processes are characterized by applying enormous impact loads to the material in a very short time to induce intense plastic flow.

[0003] However, this instantaneous and massive energy release generates intense mechanical shock vibrations. These high-frequency vibration waves propagate at high speed outwards through the steel substrate of the mold. When these vibration waves reach other precision-critical stations within the mold, such as bending, fine blanking, or forming stations, severe energy crosstalk occurs. This crosstalk vibration causes micron-level random vibrations in the lower die or moving parts of precision stations, directly affecting the dimensional accuracy and consistency of the processed parts, such as causing random fluctuations in bending angles and unstable forming contours. Furthermore, this continuous vibration impact accelerates fatigue wear on the cutting edges or forming surfaces of precision stations, shortening the mold's lifespan.

[0004] In existing technologies, passive vibration isolation methods, such as increasing the thickness of the mold frame and placing elastic damping pads like rubber between mold bases, are commonly used to attempt to alleviate this problem. However, these methods essentially rely on acoustic impedance mismatch to reflect vibration energy, rather than eliminating it. The reflected energy still forms a complex interference field within the mold matrix, failing to fundamentally eliminate the crosstalk problem, and the introduced elastic elements sacrifice the overall rigidity of the mold. Summary of the Invention

[0005] The purpose of this application is to provide a continuous stamping die and stamping process for stamped parts, which can eliminate the crosstalk of vibration energy from the impact station to the precision station during high-speed stamping, thereby ensuring the production quality of the workpiece.

[0006] Firstly, the continuous stamping die for a stamped part provided in this application adopts the following technical solution: The machine body has a lower mold base fixedly mounted on it and an upper mold base slidably mounted on it. Multiple work stations are set between the upper mold base and the lower mold base, including a first work station that generates impact vibration and a second work station that is affected by vibration. The machine body is also equipped with a drive assembly that drives the upper mold base to move up and down. The vibration energy absorbing block is a metal insert disposed in the lower mold base and located on the vibration propagation path between the first station that generates impact vibration and the second station affected by vibration. The metal insert is provided with a geometric structure for guiding and dissipating vibration waves.

[0007] Optionally, the geometric structure on the vibration energy absorption block is at least one power-law distributed surface, which is arranged along the direction from the first station to the second station, and the height of the power-law distributed surface gradually decreases from the first station to the second station. The surface profile of the power-law distributed surface follows the power-law function change, and the power exponent is greater than or equal to 2.

[0008] Optionally, the continuous stamping module further includes an energy harvesting and conduction module, which includes at least one heat conduction element. The heat input end of the heat conduction element is in thermal contact with the vibration energy absorption block, and the heat conduction element is used to collect the heat generated by the dissipation of vibration energy. The second station is a bending station. A bending punch and a pressure plate are provided on the upper die holder. The pressure plate is located around the bending punch. A spring made of shape memory alloy is provided between the pressure plate and the upper die holder. A heat conduction element is provided on the lower die holder. One end of the heat conduction element is connected to the end of the vibration energy absorption block near the second station, and the other end of the heat conduction element is connected to the spring.

[0009] Optionally, the heat conduction element is a heat pipe.

[0010] Optionally, a temperature sensor is provided at the connection between the heat-conducting element and the shape memory alloy spring.

[0011] Optionally, a shunt tube is also connected to the peripheral wall of the heat pipe. The end of the shunt tube away from the heat pipe is connected to a heat dissipation mechanism. A shape memory alloy metal baffle is provided at the connection between the shunt tube and the heat pipe. When the temperature inside the heat pipe is within a normal range, the shape memory alloy metal baffle bends slightly, and the heat pipe and the shunt tube are in a partially connected state. When the temperature inside the heat pipe is too high, the shape memory alloy metal baffle bends more significantly, and the heat pipe and the shunt tube are in a mostly connected state.

[0012] Optionally, an adjustment knob is provided at the connection between the heat pipe and the splitter pipe, which can adjust the bending amplitude of the shape memory alloy metal baffle.

[0013] Secondly, the stamping process for a stamped part provided in this application includes the following steps: S1: Based on the grade and thickness of the high-strength steel used in the current bracket production, adjust the shape memory alloy metal baffle to a suitable bending range through the external fine-tuning knob; S2: Start this equipment and external material conveying equipment. The material passes through the punching → pressing → punching → idle step → 75-degree bend → idle step → 90-degree bend → idle step → flattening → idle step → separation station on this equipment in sequence. At the "flattening" station, the punch performs high-pressure shaping on the already formed workpiece part. This process generates violent impact vibration waves. These vibration waves begin to propagate along the lower die base to the adjacent "90-degree bend" station. S21: Before the vibration wave reaches the "90-degree bend" station, it must pass through the metal inserts that are pre-set on the propagation path. The vibration wave is smoothly introduced by the metal inserts, and its energy is focused and efficiently converted into heat energy, resulting in the metal insert temperature being stably maintained at a high level. S22: The heat generated by the metal insert is quickly absorbed by the heat pipe evaporator end in close contact with it. The heat is conducted through the heat pipe to the connection between the heat pipe and the manifold. At this time, the shape memory alloy metal baffle bends due to heat, partially opening the channel to the manifold. This ensures that even at the current high temperature, the system can actively dissipate the excess heat that may cause the shape memory alloy spring to overheat, while delivering the optimized and most suitable heat flow to the shape memory alloy spring. S23: The shape memory alloy spring has been completely transformed into a hardened austenitic state. When the upper die base moves downward and the bending punch is about to contact the material, the blank holder first presses the edge of the material strip firmly with an increased and just-right blank holder force under the drive of the "hardened" shape memory alloy spring. S3: The separated workpieces are transported to a designated location via external unloading equipment for subsequent finishing.

[0014] In summary, this application includes at least one of the following beneficial technical effects: 1. This invention uses a "black hole" type metal insert to absorb and convert harmful vibration waves generated at the first work station into heat energy on-site and efficiently, instead of reflecting or blocking them as in traditional technologies. This fundamentally cuts off energy crosstalk between work stations, providing an unprecedented "dynamically quiet" processing environment for precision work stations such as bending. This results in a revolutionary improvement in the dimensional accuracy (such as bending angle) and consistency of parts, while also extending the mold life by avoiding the impact of reflected waves. 2. When the upper die holder first starts running or operates at low speed, the vibration generated at the first station is relatively weak, and the heat generated by the "acoustic black hole" metal insert is minimal, with the temperature below the phase transition point of the shape memory alloy spring. At this time, the shape memory alloy spring is in a relatively soft martensitic state, providing only a basic blank holder force, which is sufficient to meet the forming requirements at low speeds. As the punch press reaches its rated high speed, the first station generates severe and continuous impact vibrations. The "acoustic black hole" metal insert efficiently absorbs these vibrations and stably generates heat. This waste heat is efficiently and rapidly conducted to the shape memory alloy spring through heat pipes. When the shape memory alloy... When the temperature of a spring exceeds its phase transformation point, it undergoes a martensitic-to-austenitic phase transformation. The stiffness (elastic modulus) and restoring force of the shape memory alloy spring in the austenitic state are several times higher than those in the martensitic state. This causes the shape memory alloy spring to "harden" instantly, thereby applying a significantly increased blanking force to the blank holder. This increased blanking force applies a controllable positive pressure to the edge of the sheet material that is about to enter the deformation zone (bending fillet zone), preventing the material from flowing into the deformation zone too quickly or in excessive amounts. This effectively suppresses wrinkling caused by material accumulation and further improves the production quality of the product.

[0015] 3. The temperature sensor can monitor the temperature of the shape memory alloy spring in real time. Therefore, when abnormalities such as lubrication failure occur, abnormal vibration will generate abnormal heat, which in turn will generate abnormal blanking force. Both abnormal blanking force and abnormal vibration will lead to equipment damage and a decline in product quality. When the temperature sensor detects an excessively high temperature, it indicates that abnormal vibration has occurred, and the control center will immediately stop the machine. Therefore, the metal insert, heat pipe, shape memory alloy spring and temperature sensor in this invention can constitute a system. This system can act as a highly sensitive "fuse" to achieve early warning and protection against faults. 4. When shape memory alloy springs operate at excessively high temperatures for extended periods, their phase transformation characteristics will degrade. The "overheat diversion" function of this structure is equivalent to adding a passive, intelligent "thermostat" to the shape memory alloy spring. It ensures that no matter how severe the external operating conditions are, the energy transferred to the shape memory alloy spring is always controlled within an optimal and safe operating range, thereby greatly extending the service life and stability of the core functional components. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of this application; Figure 2 This is a schematic diagram of the back of the body in Embodiment 1 of this application; Figure 3 yes Figure 2 Enlarged structural diagram at point A; Figure 4This is a partial cross-sectional view of the lower mold base in Embodiment 1 of this application; Figure 5 yes Figure 4 Enlarged structural diagram at point B; Figure 6 This is a cross-sectional view of the pressure plate in Embodiment 1 of this application; Figure 7 yes Figure 6 Enlarged structural diagram at point C; Figure 8 This is a schematic diagram of the connection between the heat-conducting plate and the heat-conducting strip in Embodiment 1 of this application; In the diagram, 1. Machine body; 11. Upper die holder; 111. Bending punch; 112. Pressure plate; 113. Shape memory alloy spring; 114. Heat-conducting plate; 12. Lower die holder; 121. Mounting cavity; 13. First station; 14. Second station; 15. Drive assembly; 2. Metal insert; 21. Power-law distributed surface; 22. Heat-conducting strip; 3. Heat conduction element; 31. Heat pipe; 32. Diverter pipe; 33. Shape memory alloy metal baffle; 34. Adjustment knob; 4. Temperature sensor. Detailed Implementation

[0017] The following is in conjunction with the appendix Figure 1-8 This application will be described in further detail below. Example 1

[0018] A continuous stamping die for stamped parts, as shown in the reference. Figure 1 , Figure 2 and Figure 3 It includes the body 1 and the vibration energy absorption block.

[0019] In this embodiment, a lower die holder 12 is fixedly mounted on the machine body 1, and an upper die holder 11 is slidably mounted on it. The upper die holder 11 is located directly above the machine body 12 and slides vertically. The machine body 1 is also equipped with a drive assembly 15 for driving the upper die holder 11 to slide. In this embodiment, the drive assembly 15 mainly includes a three-phase AC motor, an air compressor, and a cylinder. The three-phase AC motor provides electrical energy to the air compressor, which converts the electrical energy into the potential energy of compressed air. Then, the cylinder converts the potential energy of the compressed air into the linear motion of the upper die holder 11. The drive assembly 15 has a power of 30KW and a slider diameter of 280mm. This is prior art and will not be described in detail here. The right side of the machine body 1 is the loading port, and the left side is the unloading port. In actual production, the right side of the machine body 1 is equipped with a metal strip conveying device (not shown in the figure) adapted to the working frequency of the stamping die holder, and the left side of the machine body 1 is equipped with a workpiece collection device (not shown in the figure).

[0020] In this embodiment, the stamping die has multiple stations arranged from right to left. These stations are punching, pressing, punching, idle step, 75-degree bend, idle step, 90-degree bend, idle step, flattening, idle step, and separation. The idle step means that when the metal strip moves to the station, the stamping die will not perform any processing steps on the metal strip. In this embodiment, the flattening station that generates impact vibration is set as the first station 13, and the 90-degree bend station that is severely affected by vibration is set as the second station 14.

[0021] Reference Figure 4 and Figure 5 In this embodiment, the vibration energy absorbing block is essentially a metal insert 2. The metal insert 2 in this embodiment is made of a high-strength alloy with specific damping characteristics (such as manganese-copper alloy or specially treated tool steel). When manufacturing the lower mold base 12 in this embodiment, a mounting cavity 121 for installing the metal insert 2 can be reserved on one side of the lower mold base 12. After the metal insert 2 is embedded in the mounting cavity 121, the slot of the mounting cavity 121 is blocked with a metal block of the same material as the lower mold base 12. The metal block is fixedly connected to the lower mold base 12 by welding technology, thereby realizing the embedding of the metal insert 2. At the same time, the cavity wall of the mounting cavity 121 near the second station 14 does not abut against the metal insert 2.

[0022] In this embodiment, the metal insert 2 is located on the vibration propagation path between the first station 13, which generates impact vibration, and the second station 14, which is affected by vibration. Furthermore, the surface of the metal insert 2 is machined into a power-law distributed curved surface 21 by cutting. Figure 8 In this embodiment, the height of the power-law distribution surface 21 gradually decreases from the first station 13 to the second station 14. Therefore, the effective waveguide cross-section thickness on the metal insert 2 becomes smaller and smaller. In this embodiment, the surface profile of the power-law distribution surface 21 follows the power-law function and the power exponent is greater than or equal to 2.

[0023] First, it should be noted that the change in the effective waveguide cross-sectional thickness on the patch in this embodiment is not linear, but follows a power-law function. The expression for the effective waveguide cross-sectional thickness is: ; Where x refers to the distance calculated from the tip of the metal insert 2 (x=0), and the tip refers to the end of the metal insert 2 that is closest to the second station 14; h(x) refers to the effective waveguide cross-sectional thickness at a distance x; 'a' refers to a coefficient related to material and size; m is a power exponent. Both theory and experiments have shown that when m ≥ 2, the propagation speed of the vibration wave transmitted from a place with a larger effective waveguide cross-section thickness to a place with a smaller effective waveguide cross-section thickness will decrease sharply, and its amplitude will be amplified sharply. In other words, the vibration wave in this embodiment is mainly a bending wave. Bending waves propagate in solid objects and do not travel in air. Therefore, the smaller the effective waveguide cross-section thickness of the metal insert 2 (from the first station 13 to the second station 14), the smaller the transmission speed of the vibration wave.

[0024] When the equipment starts, the first station 13 emits a vibration wave. This vibration wave reaches one end of the metal insert 2. Since x is at its maximum at this point, the effective waveguide cross-section thickness of the metal insert 2 is also at its maximum at this location. Furthermore, the thickness change of the metal insert 2 is relatively gradual near the first station 13, resulting in minimal change in acoustic impedance. The vibration wave enters the metal insert 2 very smoothly with almost no reflection. According to existing technology, the propagation speed of a bending wave (vibration wave) in a thin plate is proportional to the square root of the plate thickness. As the vibration wave travels along the metal insert 2 towards its tip, x decreases, and the thickness of the metal insert 2 decreases sharply. This means that the wave speed also decreases sharply but smoothly. When the vibration wave reaches the position x=0, theoretically the plate thickness is 0, and the wave speed also approaches zero. According to the law of conservation of energy, the energy of the wave... The flow rate is constant, and the energy flow is proportional to (velocity multiplied by the square of amplitude). When the wave velocity v drops sharply, in order to maintain energy conservation, the amplitude A must be drastically amplified. That is, all the vibration energy is "compressed" and "focused" to the tiny area infinitely close to the tip of the metal insert 2. In this embodiment, the metal insert 2 is made of a manganese-copper alloy with specific damping characteristics. Therefore, when the vibration wave propagates in the metal insert 2, internal friction will be generated in the metal insert 2. The energy dissipation efficiency is proportional to the square of the amplitude. In the tip region of the metal insert 2, the amplitude is amplified by hundreds or thousands of times. This means that the energy dissipation efficiency is amplified by hundreds of thousands or even millions of times. Almost instantaneously, all the mechanical energy focused here is efficiently converted into heat energy, causing a slight increase in temperature in this region.

[0025] In summary, when the vibration wave propagates from the thickest end of the metal insert 2 to the tip of the metal insert 2, almost all of the vibration wave's energy is converted into heat energy without transmission or reflection. During this process, the vibration generated at the first station 13 cannot be transmitted to the second station 14 through the lower die holder 12. Compared with existing technologies, this provides a more static processing environment for precision stations such as bending, resulting in a significant improvement in the dimensional accuracy (such as bending angle) and consistency of parts, thereby greatly improving the production quality of the products. In addition, compared with the existing technology of "passive vibration isolation" by increasing the thickness of the lower die holder 12 and using vibration damping pads, this embodiment eliminates the vibration wave through the metal insert 2, thereby achieving the purpose of "active vibration damping". Compared with traditional technical means, this method can avoid the phenomenon of vibration wave reflection, thereby minimizing the repeated propagation of vibration waves in the mold and improving the service life of the mold.

[0026] Reference Figure 6 and Figure 8 The continuous stamping module in this embodiment also includes an energy harvesting and conduction module, which includes multiple heat conduction elements 3. The heat input end of the heat conduction element 3 is in contact with the tip of the metal insert 2. The heat conduction element 3 is used to collect the heat generated by dissipating vibration energy.

[0027] In this embodiment, the lower end face of the upper die holder 11 is provided with a bending punch 111 and a pressure plate 112. A through slot is opened in the middle of the pressure plate 112 for the bending punch 111 to pass through. A spring made of shape memory alloy is provided between the pressure plate 112 and the upper die holder 11. In this embodiment, multiple springs are provided, and the specific number can be determined according to the actual situation. In the initial state, the lowest point of the bending punch 111 is further away from the lowest surface of the pressure plate 112 than the lower die holder 12. A heat conduction element 3 is provided on the lower die holder 12. In this embodiment, the heat conduction element 3 is set as a heat pipe 31. A heat conduction plate 114 is provided between the multiple shape memory alloy springs 113 and the upper die holder 11. A heat-conducting strip 22 is fixedly connected to one end of the metal insert 2 near the second work station 14. One end of the heat pipe 31 is connected to the heat-conducting strip 22, and the other end of the heat pipe 31 is connected to the heat-conducting plate 114. In addition, the heat-conducting plate 114 and the heat-conducting strip 22 in this embodiment are both made of 5252 aluminum alloy. This material has good thermal conductivity and good impact resistance. Its use in conjunction with the heat pipe 31 can efficiently transfer the heat on the metal insert 2 to each shape memory alloy spring 113. The heat pipe 31 in this embodiment is a braided flexible heat pipe 31, which has good flexibility and can be repeatedly bent to adapt to the working state of the upper mold base 11 moving up and down repeatedly.

[0028] In the manufacturing process of this embodiment, there are 90-degree bending stations and flattening stations. For some high-strength or surface-sensitive metal sheet materials, when the metal sheet is bent, the inner rounded corner area of ​​the metal sheet will be subjected to strong compressive stress. Without sufficient external constraints, these compressed materials will lose stability, thus wrinkling like cloth, greatly reducing the strength of the part. At the same time, in the outer rounded corner area of ​​the bend, the material is subjected to strong tensile stress. If the material's fluidity (ductility) is insufficient, or the tensile deformation is too concentrated, it will exceed its forming limit, causing the material to break and crack. The pressure plate 112 can apply a vertically downward controllable positive pressure to the edge of the metal sheet that is about to enter the deformation zone (bending rounded corner area). After the pressure plate 112 applies positive pressure to the metal plate, friction exists between the metal plate and the pressure plate 112. That is, the pressure plate 112 applies a frictional resistance to the metal plate, preventing the material on the metal plate from flowing into the deformation zone too quickly or in excessive amounts, thereby effectively suppressing wrinkling caused by material accumulation. At the same time, by controlling the amount of material flowing into the deformation zone, it can force the material to undergo uniform stretching deformation over a wider area, rather than concentrating all the stretching on the most dangerous point of the outer rounded corner, thereby improving the forming limit and effectively preventing cracking. In summary, the blank holder force is the guarantee for achieving high-quality sheet metal forming. If the blank holder force is too small, it cannot hold the sheet metal in place and will cause wrinkling; if the blank holder force is too large, it cannot be pulled out and will cause cracking. Only within the appropriate range can perfect parts be obtained.

[0029] However, in actual production, in the initial stage, the stamping frequency of the stamping module in this embodiment is relatively low, that is, the stamping speed is low. After the equipment is preheated, the stamping frequency of the stamping module in this embodiment will increase, that is, the stamping speed will increase. As the stamping speed increases, it means that the deformation speed of the metal sheet is faster, which will cause the metal sheet to undergo strain rate hardening effect. That is, the faster the deformation speed of the metal sheet, the stronger the metal sheet's resistance to deformation (yield strength and tensile strength). At high speed, the material on the outer side of the bend is stretched extremely quickly. Due to strain rate hardening, the material's ductility (plasticity) decreases significantly. The outer side of the bend of the metal sheet does not have time to adapt to this stretching through plastic flow before reaching its fracture limit, thus causing cracking. Similarly, the material compressed on the inner side of the bend of the metal sheet also becomes relatively hard. When these hardened materials are rapidly squeezed, they tend to release stress through unstable buckling (like cardboard being bent) rather than through smooth plastic flow to redistribute stress, thus making them more prone to wrinkling.

[0030] It should be noted that in this embodiment, when the stamping module is in the initial stage, i.e., the stamping speed is relatively low, the vibration generated by the first station 13 is weak, resulting in fewer vibration waves. Therefore, the heat generated by the metal insert 2 is relatively small, and the heat transferred to the shape memory alloy spring 113 is also relatively small. As a result, the temperature of the shape memory alloy spring 113 does not reach its phase transformation point. At this time, the shape memory alloy spring 113 is in a relatively soft martensitic state, providing only an extrusion blank holder force, which is sufficient to meet the forming requirements under low-speed stamping. As the stamping speed increases, the first station 13 generates violent and continuous impact vibrations. After these vibrations, the heat generated by the metal insert 2 increases rapidly. This heat is transferred through the heat pipe. The energy 31 is efficiently and rapidly conducted to the shape memory alloy spring 113. When the temperature of the shape memory alloy spring 113 exceeds its phase transformation point, it undergoes a martensitic-to-austenitic phase transformation. The stiffness (elastic modulus) and restoring force of the shape memory alloy spring 113 in the austenitic state are several times higher than those in the martensitic state, meaning the shape memory alloy spring 113 becomes harder. Therefore, the elastic potential energy of the shape memory alloy spring 113 decreases, while the formation of the upper die holder 11 remains unchanged. The pressure exerted by the shape memory alloy spring 113 on the pressure plate 112 increases, and the blank holder force exerted by the pressure plate 112 on the metal plate also increases. Therefore, the frictional resistance of the pressure plate 112 on the material flow on the metal plate increases, and the frictional resistance between the material flow on the metal plate and the pressure plate increases. The material in contact with the pressure plate 112 cannot easily slide into the deformation zone. When the bending punch 111 forcibly stretches the material downwards, the subsequent replenishment of material is greatly limited. Therefore, the tensile deformation is no longer confined to the weakest point at the outer corner of the deformation zone. To meet the overall deformation, the tensile stress is "forced" to diffuse and transfer to a wider area (the area below the pressure plate 112) away from the corner. The final result is that the ultimate tensile stress that originally needed to be borne by 1 cm² of material is now distributed over an area of ​​5 cm² or even wider. The actual strain borne by each unit area of ​​material is far below its failure strain limit, meaning the probability of cracks forming in the deformation zone of the metal plate is greatly reduced. Simultaneously… The pressure plate 112 increases the blanking force on the metal plate. The pressure plate 112 applies a huge normal pressure perpendicular to the plate surface to the material on the metal plate that is about to enter the deformation zone. This normal pressure presses the material firmly against the flat surface of the lower die base 12. When the compressive stress in the inner rounded corner of the deformation zone of the metal plate tries to make the material "arch" upward to form wrinkles, it must first overcome this strong normal pressure and the frictional force generated therefrom. Under normal circumstances, this compressive stress cannot overcome this normal pressure and frictional force. Therefore, the material is deprived of the physical space and possibility of out-of-plane deformation (i.e. wrinkling) and can only choose to carry out controlled plastic flow in the plane, thereby greatly reducing the probability of wrinkling in the deformation zone of the metal plate.

[0031] In summary, in the initial stage of operation of the stamping module in this embodiment, the stamping speed is relatively low, resulting in a relatively low deformation rate of the metal sheet. The metal sheet does not undergo strain rate hardening, meaning it retains good plasticity. Simultaneously, the low stamping speed also reduces the vibration generated at the first station 13, resulting in fewer vibration waves and less heat generated by the metal insert 2. This heat is insufficient to cause the shape memory alloy spring 113 to undergo a martensitic-to-austenitic phase transformation. Therefore, the shape memory alloy spring 113 still possesses good elastic potential energy, and the pressure exerted by the shape memory alloy spring 113 on the pressure plate 112 is relatively small, meaning the pressure applied by the pressure plate 112 on the metal sheet is small. At this point, the pressure applied by the pressure plate 112 on the metal sheet matches the deformation rate of the metal sheet. However, as the stamping speed of the stamping module increases, the deformation rate of the metal sheet increases, and the metal sheet undergoes strain rate hardening, becoming harder. At this point, the metal sheet is prone to cracking and wrinkling. However, the higher stamping speed at this stage... The high temperature also causes severe vibration in the first station 13, resulting in more vibration waves and a rapid increase in heat generated by the metal insert 2. This increased heat causes the shape memory alloy spring 113 to undergo a martensitic-to-austenitic phase transformation, making it harder and significantly reducing its elastic potential energy. Consequently, the pressure exerted by the shape memory alloy spring 113 on the pressure plate 112 increases, leading to a greater blanking force exerted by the pressure plate 112 on the metal plate. This increased blanking force significantly reduces the probability of cracking and wrinkling of the metal plate under high deformation speed, thus further ensuring the overall production quality of the product. Simultaneously, this solution converts the harmful vibration energy generated in the first station 13 into the control force required for the second station 14. This solution eliminates the need for any external controllers or sensors, enabling the stamping module to automatically adjust the blanking force required for bending the metal plate according to its own stamping speed. Overall, it not only achieves efficient energy utilization but also constitutes a relatively stable self-regulating system.

[0032] Additionally, refer to Figure 4 , Figure 6 and Figure 8 In this embodiment, a temperature sensor 4 is embedded inside the heat-conducting plate 114.

[0033] When the lubrication system malfunctions and the oil film thins, the stamping friction increases dramatically. The first station 13 will generate abnormally high-frequency vibrations, causing the temperature of the metal insert 2 to rise sharply. This temperature signal will be rapidly transmitted through the heat pipe 31, causing the shape memory alloy spring 113 to generate a huge blanking force far exceeding the normal operating range. This abnormal pressure will immediately cause severe obstruction of material flow and a sharp increase in the load on the punch press. The temperature sensor 4 can continuously monitor the shape memory alloy spring, and a preset value can be set in the control center. The temperature sensor 4 is electrically connected to the control center. When the temperature detected by the temperature sensor 4 reaches the preset value, the control center will immediately stop the machine. Therefore, by adding the temperature sensor 4, this system can detect the thermal signal and infer whether the vibration wave signal is normal, thereby determining whether the working status of the equipment is normal. In this way, production can be forcibly terminated before a large number of scraps or mold damage occur due to lubrication failure, thus protecting the mold and the product.

[0034] It should be noted that in this embodiment, the drive component 15, the motor, and the cylinder, as well as other electrically driven devices, are all electrically connected to the control center, which is a PLC in this embodiment.

[0035] In this embodiment, a shunt pipe 32 is also connected to the peripheral wall of the heat pipe 31. The end of the shunt pipe 32 away from the heat pipe 31 is connected to a heat dissipation mechanism. A shape memory alloy metal baffle 33 is provided at the connection between the shunt pipe 32 and the heat pipe 31. In this embodiment, the shunt pipe 32 and the heat pipe 31 are made of the same material, which is a braided flexible heat pipe 31. In this embodiment, the heat dissipation mechanism can be a heat dissipation fin or other device. In this embodiment, heat dissipation fins are preferred.

[0036] When the device is not in operation, i.e., when no heat is transferred within the heat pipe 31, the temperature within the heat pipe 31 is at a normal value, and the shape memory alloy metal baffle 33 blocks the diverter 32. However, when the device is operating normally, heat flows within the heat pipe 31, and the temperature of the shape memory alloy metal baffle 33 rises to a certain level. At this time, the shape memory alloy metal baffle 33 is slightly bent, and the heat pipe 31 and the diverter 32 are partially connected. This means that not all heat is transferred to the shape memory alloy spring 113, but a small portion of excess heat is diverted and dissipated through the heat dissipation fins, thus keeping the shape memory alloy spring 113 within its tolerable temperature range and greatly improving its service life. When the temperature within the heat pipe 31 is too high, the shape memory alloy metal baffle 33 bends significantly, and the heat pipe 31 and the diverter 32 are mostly connected. The diverter 32 actively and quickly dissipates most of the excess and harmful heat through the heat dissipation fins, further enhancing the protection of the shape memory alloy.

[0037] It should be noted that the installation of the shunt tube 32 does not affect the use of the temperature sensor 4. The shunt tube 32 is installed to enhance the protection of the shape memory alloy spring 113. It is to prevent the heat transferred by the heat pipe 31 from exceeding the range that the shape memory alloy spring 113 can withstand during normal operation, thereby causing damage to the shape memory alloy spring 113. In this embodiment, the phase transition temperatures of the shape memory alloy spring 113 and the shape memory alloy metal baffle 33 are different. The phase transition temperature of the shape memory alloy metal baffle 33 is higher than that of the shape memory alloy spring 113. Furthermore, the phase transition temperatures of the shape memory alloy spring 113 and the shape memory alloy metal baffle 33, as well as the preset value of the control center temperature sensor 4, can all be adjusted according to the actual situation.

[0038] Finally, refer to Figure 6 and Figure 7 In this embodiment, an adjustment knob 34 is also provided at the connection between the heat pipe 31 and the split pipe 32. The adjustment knob 34 is rotatably mounted on the outer peripheral wall of the split pipe 32. One end of the adjustment knob 34 is inserted into the split pipe 32 and abuts against the shape memory alloy metal baffle 33. The adjustment knob 34 can adjust the bending range of the shape memory alloy metal baffle 33.

[0039] When producing products of different materials and thicknesses, the ideal blank holder force curve may differ. In this case, the operator can preset the bending amplitude of the shape memory alloy metal baffle 33 during the mold debugging stage by tightening the adjustment knob 34. This applies a preload to the shape memory alloy metal baffle 33, requiring a higher temperature to bend it to the extent necessary to open the manifold 32 channel. This means that more heat will be transferred to the shape memory alloy spring 113, resulting in a higher blank holder force at the same stamping speed. Conversely, loosening the adjustment knob 34 makes it easier to open the manifold 32 channel, bypassing most of the heat. The blank holder force obtained by the shape memory alloy spring 113 is relatively low. This allows a single mold to be adapted to various production tasks requiring different materials (with different blank holder force curves) through simple external fine-tuning, greatly enhancing the practicality of the equipment. Example 2

[0040] A stamping process for a stamped part, based on the aforementioned continuous stamping die for a stamped part, includes the following steps: S1: Based on the grade and thickness of the high-strength steel used in the current bracket production, adjust the shape memory alloy metal baffle 33 to a suitable anti-bending force through the external fine-tuning knob 34; S2: Start this equipment and external material conveying equipment. The material passes through the punching → pressing → punching → idle step → 75-degree bend → idle step → 90-degree bend → idle step → flattening → idle step → separation station on this equipment in sequence. At the "flattening" station, the punch performs high-pressure shaping on the formed workpiece part. This process generates violent impact vibration waves. These vibration waves begin to propagate along the lower die base 12 to the adjacent "90-degree bend" station. S21: Before the vibration wave reaches the "bend 90 degrees" station, it must pass through the metal insert 2 that is preset on the propagation path. The vibration wave is smoothly introduced by the metal insert 2, and its energy is focused and efficiently converted into heat energy, resulting in the temperature of the end of the metal insert 2 away from the first station 13 being stably maintained at a high level. S22: The heat generated by the metal insert 2 is quickly absorbed by the evaporation end of the heat pipe 31, which is in close contact with it. The heat is conducted through the heat pipe 31 to the connection between the heat pipe 31 and the distribution pipe 32. At this time, the shape memory alloy metal baffle 33 bends due to heat, partially opening the channel to the distribution pipe 32. This ensures that even at the current high temperature, the system can actively dissipate the excess heat that may cause the shape memory alloy spring 113 to overheat, while delivering the optimized and most suitable heat flow to the shape memory alloy spring 113. S23: The shape memory alloy spring 113 has been completely transformed into a hardened austenitic state. When the upper die holder 11 moves downward and the bending punch 111 is about to contact the material, the pressure plate 112 first presses the edge of the material strip firmly with an increased and just right pressure force under the drive of the already "hardened" shape memory alloy spring 113. S3: The separated workpieces are transported to a designated location via external unloading equipment for subsequent finishing.

[0041] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A continuous stamping die for stamped parts, characterized in that, include: The machine body (1) is fixedly provided with a lower mold base (12) and slidably provided with an upper mold base (11). Multiple work stations are provided between the upper mold base (11) and the lower mold base (12), including a first work station (13) that generates impact vibration and a second work station (14) that is affected by vibration. The machine body (1) is also provided with a drive assembly (15) that drives the upper mold base (11) to move up and down. Vibration energy absorption block, which is a metal insert (2), the metal insert (2) is disposed in the lower mold base (12) and located on the vibration propagation path between the first station (13) that generates impact vibration and the second station (14) affected by vibration, the metal insert (2) is provided with a geometric structure for guiding and dissipating vibration waves; The geometric structure on the metal insert (2) is a power-law distribution surface (21). The power-law distribution surface (21) is arranged along the direction from the first station (13) to the second station (14), and the height of the power-law distribution surface (21) gradually decreases from the first station (13) to the second station (14). The surface profile of the power-law distribution surface (21) follows the power-law function change, and the power exponent is greater than or equal to 2. The continuous stamping module also includes an energy harvesting and conduction module, which includes at least one heat conduction element (3). The heat input end of the heat conduction element (3) is in thermal contact with the vibration energy absorption block. The heat conduction element (3) is used to collect the heat generated by the dissipation of vibration energy. The second station (14) is a bending station. A bending punch (111) and a pressure plate (112) are provided on the upper die holder (11). The pressure plate (112) is located around the bending punch (111). A spring made of shape memory alloy is provided between the pressure plate (112) and the upper die holder (11). A heat conduction element (3) is provided on the lower die holder (12). One end of the heat conduction element (3) is connected to the end of the vibration energy absorption block near the second station (14), and the other end of the heat conduction element (3) is connected to the spring.

2. The continuous stamping die for a stamped part according to claim 1, characterized in that, The heat conduction element (3) is a heat pipe (31).

3. The continuous stamping module for a stamped part according to claim 2, characterized in that, A temperature sensor (4) is provided at the connection between the heat conduction element (3) and the shape memory alloy spring (113).

4. The continuous stamping die for a stamped part according to claim 3, characterized in that, A shunt pipe (32) is also connected to the peripheral wall of the heat pipe (31). The end of the shunt pipe (32) away from the heat pipe (31) is connected to a heat dissipation mechanism. A shape memory alloy metal baffle (33) is provided at the connection between the shunt pipe (32) and the heat pipe (31). When the temperature inside the heat pipe (31) is at a normal value, the shape memory alloy metal baffle (33) bends slightly, and the heat pipe (31) and the shunt pipe (32) are in a partially connected state. When the temperature inside the heat pipe (31) is too high, the shape memory alloy metal baffle (33) bends more, and the heat pipe (31) and the shunt pipe (32) are in a mostly connected state.

5. The continuous stamping die for a stamped part according to claim 4, characterized in that, An adjustment knob (34) is also provided at the connection between the heat pipe (31) and the splitter pipe (32), which can adjust the bending amplitude of the shape memory alloy metal baffle (33).

6. A stamping process for a stamped part, based on a continuous stamping die for a stamped part according to any one of claims 1-5, comprising the following steps: S1: Based on the grade and thickness of the high-strength steel used in the current bracket production, adjust the shape memory alloy metal baffle (33) to a suitable bending amplitude through the external fine-tuning adjustment knob (34); S2: Start this equipment and external material conveying equipment. The material passes through the punching → pressing ribs → punching → empty step → 75-degree bend → empty step → 90-degree bend → empty step → flattening → empty step → separation station on this equipment in sequence. At the "flattening" station, the punch performs high-pressure shaping on the already formed workpiece part. This process generates violent impact vibration waves. These vibration waves begin to propagate along the lower die base (12) to the adjacent "90-degree bend" station. S21: Before the vibration wave reaches the "bend 90 degrees" station, it must pass through the metal insert (2) preset on the propagation path. The vibration wave is smoothly introduced by the metal insert (2), and its energy is focused and efficiently converted into heat energy, resulting in the temperature of the metal insert (2) being stably maintained at a high level. S22: The heat generated by the metal insert (2) is quickly absorbed by the evaporation end of the heat pipe (31) which is in close contact with it. The heat is conducted through the heat pipe (31) to the connection between the heat pipe (31) and the split pipe (32). At this time, the shape memory alloy metal baffle (33) bends due to heat, partially opening the channel to the split pipe (32). This ensures that even at the current high temperature, the system can actively dissipate the excess heat that may cause the shape memory alloy spring (113) to overheat, while delivering the optimized and most suitable heat flow to the shape memory alloy spring (113). S23: The shape memory alloy spring (113) has been completely transformed into a hardened austenitic state. When the upper die holder (11) moves downward and the bending punch (111) is about to contact the material, the blank holder (112) first presses the edge of the material strip firmly with an increased and just right blank holder force under the drive of the already "hardened" shape memory alloy spring (113). S3: The separated workpieces are transported to a designated location via external unloading equipment for subsequent finishing.

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