Precision stamping and forging integrated method

Abstract

The invention relates to the technical field of metal processing and manufacturing, and discloses a precision stamping and forging integration method which comprises the following steps: step 1, establishing a workpiece three-dimensional parameterized model, and predicting material flow stress distribution; 2, a servo motor is adopted to drive a punching machine, and the temperature of a die is kept at 80 + / -5 DEG C in the punching process; thirdly, the workpiece is placed in the environment with the vacuum degree smaller than or equal to 1 * 10 Pa; step 4, adopting a gradient cooling process, firstly keeping in a nitrate bath at 180-220 DEG C for 5-8 minutes, and then cooling to room temperature at the rate of 30-50 DEG C / s; and fifthly, the surface roughness Ra is smaller than or equal to 0.6 micrometer through micro shot blasting treatment. Through the synergistic effect of three-dimensional modeling and a dynamic compensation mechanism, in combination with laser online detection and high positioning precision of a feeding mechanism, dynamic control over a die gap, real-time monitoring of the workpiece size and accurate prediction of material flow stress distribution are achieved, the problems of tearing belts and size fluctuation of traditional stamping parts are solved, and the production efficiency is improved. And the product assembly precision and batch consistency are ensured.

Description

Technical Field

[0001] This invention relates to the field of metal processing and manufacturing technology, specifically to an integrated method for precision stamping and forging. Background Technology

[0002] In modern manufacturing, precision stamping and forging technologies are widely used in many fields such as automobiles, aerospace, and electronics. For the production of high-quality, high-precision parts, the precision stamping and forging integrated method is a process that organically combines precision stamping and forging processes to leverage their respective advantages and achieve more efficient precision parts manufacturing.

[0003] Traditional stamping processes cannot avoid the formation of tear strips in stamped parts. The presence of tear strips not only affects the appearance quality of the workpiece, but also reduces the strength and fatigue life of the workpiece, negatively impacting the overall performance of the product. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides an integrated method for precision stamping and forging, which solves the problems of tearing and dimensional fluctuation in stamped parts.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an integrated method for precision stamping and forging, comprising the following steps: Step 1: Establish a three-dimensional parametric model of the workpiece, optimize the stamping speed in the range of 80-120 mm / s through plastic forming simulation, set the die clearance to 3-5% of the material thickness, and predict the distribution of material flow stress. Step 2: Use a servo motor to drive the punch press and perform continuous punching at a frequency of 100-150 times / minute under a punching force of 800-1200kN. During the punching process, keep the die temperature at 80±5℃. Step 3: Place the workpiece in an environment with a vacuum degree ≤1×10⁻³Pa, heat it to 1020-1050℃ at a rate of 15-20℃ / min, hold it at that temperature for 20-30 minutes, and then perform oil quenching. Step 4: Use a gradient cooling process. First, keep the solution in a nitrate bath at 180-220℃ for 5-8 minutes, and then cool it to room temperature at a rate of 30-50℃ / s. Step 5: The surface roughness Ra≤0.6μm is achieved by micro-shot peening. The shot peening medium is ceramic shot with a diameter of 0.1-0.3mm, and the peening pressure is 0.3-0.5MPa.

[0006] Preferably, in step one, the mold gap adopts a dynamic compensation mechanism. During the stamping process, the gap change is monitored in real time by a piezoelectric sensor, and the slider position is automatically adjusted when the deviation exceeds the set value of 5%.

[0007] Preferably, in step two, the working surface of the stamping die is coated with a 2-3 μm thick diamond-like carbon film layer, and the surface hardness after coating reaches HV3000-3500. The stamping equipment is equipped with a feeding mechanism with a feeding positioning accuracy of ±0.01 mm.

[0008] Preferably, an online inspection process is provided between step two and step three. The online inspection process uses a laser 3D scanner to detect the workpiece size in real time, with a detection frequency of 5-8 pieces per minute and a measurement accuracy of ±2μm.

[0009] Preferably, in step four, the gradient cooling adopts a multi-channel cooling system, with the temperature of the first cooling zone controlled at 200±10℃, the temperature of the second cooling zone controlled at 80±5℃, and the transition time between the two zones ≤2 seconds.

[0010] Preferably, step five is followed by a dimensional stabilization treatment: an aging treatment at 180-200℃ for 2 hours under nitrogen protection, resulting in a workpiece dimensional change rate of ≤0.005%.

[0011] Preferably, the stamping die adopts a double-layer structure design, with the inner layer being SKD11 die steel and the outer layer being a copper alloy heat dissipation layer, and the two layers are connected by vacuum diffusion welding.

[0012] Preferably, in step four, an intelligent temperature control algorithm is used to dynamically adjust the cooling intensity according to the temperature changes of different parts of the workpiece, with a temperature control accuracy of ±3℃.

[0013] Preferably, the material is modified DC53 cold work die steel, the modified DC53 cold work die steel comprising the following parts by weight: C 1.5-1.6 parts, Si 0.9-1.1 parts, Mn 0.4-0.6 parts, Cr 8.0-8.5 parts, Mo 2.0-2.2 parts, V 0.5-0.7 parts, balance Fe.

[0014] Preferably, the assembly process after step five adopts the compensation assembly method, reserving a process allowance of 0.005-0.008mm on the key mating surfaces, and achieving a final mating clearance of 0.002-0.005mm through selective grinding.

[0015] This invention provides an integrated method for precision stamping and forging. It offers the following advantages: 1. The synergistic effect of the three-dimensional modeling and dynamic compensation mechanism of this invention, combined with the high positioning accuracy of laser online detection and feeding mechanism, realizes dynamic control of mold gap, real-time monitoring of workpiece size and accurate prediction of material flow stress distribution. This results in the formation of a fully bright band on the stamping section, with a surface roughness Ra≤0.6μm, stable assembly gap between mating surfaces at 0.002-0.005mm, and dimensional change rate ≤0.005%. This solves the problems of tear bands and dimensional fluctuations in traditional stamping parts, ensuring product assembly accuracy and batch consistency.

[0016] 2. This invention utilizes a rapid quenching oil and gradient cooling system based on vacuum heat treatment technology, combined with 180-220℃ nitrate salt bath heat preservation and rapid cooling at 30-50℃ / s, to refine the grains of modified DC53 steel and improve hardness uniformity. At the same time, the diamond-like carbon film layer and micro-shot peening treatment on the working surface of the mold further enhance the surface density, achieving a material strength increase of more than 30%, a wear resistance increase of more than 50%, and extending the service life of the workpiece.

[0017] 3. This invention adopts a high-speed stamping and multi-channel cooling system driven by a servo motor, combined with an intelligent temperature control algorithm, which significantly shortens the process cycle. Through dynamic compensation mechanism and online detection, the rework rate is reduced. The double-layer mold structure improves heat dissipation efficiency, thereby increasing overall production efficiency by 30%, reducing energy consumption by more than 20%, and reducing production costs by 30%, thus improving production efficiency and reducing costs. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the process of a precision stamping and forging integrated method of the present invention. Detailed Implementation

[0019] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Please see the appendix Figure 1 This invention provides a precision stamping and forging integrated method, comprising the following steps: Step 1: Establish a three-dimensional parametric model of the workpiece, optimize the stamping speed in the range of 80-120 mm / s through plastic forming simulation, set the die clearance to 3-5% of the material thickness, and predict the distribution of material flow stress. Three-dimensional parametric modeling, based on computer-aided design technology, accurately presents the geometric shape and size information of the workpiece in digital form. Plastic forming simulation uses numerical simulation methods to simulate the flow and deformation process of the material in the mold based on the mechanical properties of the material and the stamping process conditions. In this process, by adjusting the stamping speed and mold clearance parameters, the changes in the material flow stress distribution are observed, thereby finding the optimal parameter combination. Three-dimensional models are the foundation of simulation analysis. They can intuitively display the design intent of the workpiece. Optimizing the stamping speed can ensure that the material fills the mold cavity fully and evenly during stamping, avoiding material accumulation or insufficient filling caused by improper speed. Setting the mold clearance reasonably can ensure the quality of the blanking section, reduce burrs and corner collapse. Predicting the distribution of material flow stress helps to discover potential stress concentration areas in advance, providing direction for optimizing the mold structure and adjusting process parameters, and preventing workpiece cracking and deformation defects. By establishing an accurate three-dimensional parametric model of the workpiece and combining it with plastic forming simulation, the stamping process can be simulated comprehensively and accurately. The optimized stamping speed and die clearance settings can effectively improve the forming quality of the workpiece and reduce the generation of defects. At the same time, the distribution of material flow stress can be predicted, providing a reliable basis for subsequent process adjustments and ensuring that the workpiece quality is stable and meets the design requirements.

[0021] Step 2: Use a servo motor to drive the punch press and perform continuous punching at a frequency of 100-150 times / minute under a punching force of 800-1200kN. During the punching process, keep the die temperature at 80±5℃. The servo motor can control the movement of the punch press according to the instructions of the control system, and realize the adjustment of the stamping speed and stroke parameters. Under the stamping force of 800-1200kN, this force range can make the material produce sufficient plastic deformation in the die to achieve the expected shape. The stamping frequency of 100-150 times / minute improves production efficiency while ensuring stamping quality. By controlling the die temperature at 80±5℃, the principle of heat transfer is used to keep the die at a suitable temperature and improve the friction state between the material and the die. The precise control of the servo motor ensures the consistency of each stamping, reducing the impact of human factors on stamping quality. Appropriate stamping force can ensure that the material is fully deformed to meet the forming requirements of different workpieces. Higher stamping frequency can produce more workpieces per unit time, improving production efficiency. Stable mold temperature can reduce the friction between the material and the mold surface, reduce mold wear, and at the same time make the material flow more evenly during the stamping process, which is conducive to improving the surface quality and dimensional accuracy of the workpiece. By employing a servo motor to drive the punch press, combined with specific punching force, punching frequency, and die temperature control, a stable and efficient continuous punching process can be achieved. The produced workpieces have high dimensional accuracy and good surface quality, while the die life is extended. Step 3: Place the workpiece in an environment with a vacuum degree ≤1×10⁻³Pa, heat it to 1020-1050℃ at a rate of 15-20℃ / min, hold it at that temperature for 20-30 minutes, and then perform oil quenching. In a vacuum environment, the oxygen content is extremely low, greatly reducing oxidation reactions and preventing the formation of oxide scale on the workpiece surface, thus protecting the surface quality. Heating to 1020-1050℃ at a rate of 15-20℃ / min ensures uniform heating of the workpiece's internal structure, gradually initiating phase transformation. Holding at this temperature for 20-30 minutes allows the internal structure to fully complete the transformation and reach a stable state. After holding, oil quenching is performed. Oil quenching has a rapid cooling rate, enabling the austenitic structure to quickly transform into martensite, thereby improving the workpiece's hardness and strength. It ensures the smoothness of the workpiece surface and the consistency of chemical composition. The heating rate and holding time ensure that the internal structure of the workpiece is uniform and stable. At the same time, the martensitic structure formed by oil quenching gives the workpiece high hardness and high strength, meeting the mechanical performance requirements of the workpiece in practical applications. The workpiece is heated in an environment with a vacuum degree of ≤1×10⁻³Pa, and then operated in a heating, holding and cooling manner to effectively avoid oxidation and decarburization of the workpiece, optimize the internal structure of the workpiece, and significantly improve the hardness of the workpiece.

[0022] Step 4: Use a gradient cooling process. First, keep the solution in a nitrate bath at 180-220℃ for 5-8 minutes, and then cool it to room temperature at a rate of 30-50℃ / s. The gradient cooling process first involves holding the workpiece in a 180-220℃ nitrate bath for 5-8 minutes. The nitrate bath has good thermal stability and heat uniformity, which allows the workpiece to have a uniform internal and external temperature and undergo partial microstructural transformation, reducing thermal stress. Subsequently, the workpiece is cooled to room temperature at a rate of 30-50℃ / s. This cooling rate can further adjust the microstructure of the workpiece to obtain the required mechanical properties. The multi-channel cooling system controls the cooling rate of different areas through different channels. The temperature of the first cooling zone is controlled at 200±10℃, and the temperature of the second cooling zone is controlled at 80±5℃, with a transition time between the two zones of ≤2 seconds. This enables precise temperature control of the workpiece cooling process. Differentiated cooling is performed according to the heat dissipation requirements of different parts of the workpiece. The intelligent temperature control algorithm dynamically adjusts the cooling intensity by adjusting the flow rate and temperature parameters of the cooling medium based on the temperature changes of different parts of the workpiece. The temperature control accuracy is ±3℃, further optimizing the cooling process and ensuring uniform cooling of all parts of the workpiece. Gradient cooling effectively avoids thermal stress concentration caused by excessively fast or uneven cooling rates, reducing the risk of workpiece deformation and cracking. The synergistic effect of multi-channel cooling systems and intelligent temperature control algorithms can control the cooling process according to the workpiece shape, size, and material properties, making the internal structure of the workpiece more uniform, improving the dimensional stability and comprehensive mechanical properties of the workpiece, and ensuring the reliability and durability of the workpiece in subsequent use. By employing a gradient cooling process combined with a multi-channel cooling system and intelligent temperature control algorithm, the thermal stress distribution during the workpiece cooling process is effectively controlled, reducing deformation and cracking tendencies, improving the dimensional stability and comprehensive mechanical properties of the workpiece, and making the internal structure of the workpiece more uniform and dense.

[0023] Step 5: The surface roughness Ra≤0.6μm is achieved by micro-shot peening. The shot peening medium is ceramic shot with a diameter of 0.1-0.3mm, and the peening pressure is 0.3-0.5MPa.

[0024] Micro-shot peening utilizes compressed air or centrifugal force to propel ceramic pellets with a diameter of 0.1-0.3 mm at a high speed onto the workpiece surface with a spray pressure of 0.3-0.5 MPa. When the ceramic pellets impact the workpiece surface, they cause micro-plastic deformation of the surface material, filling the micro-pits on the surface and reducing surface roughness. At the same time, a residual compressive stress layer is formed on the surface, improving the fatigue strength and wear resistance of the surface. Good surface finish not only improves the appearance quality of the workpiece, but also reduces surface micro-defects and the possibility of stress concentration. The residual compressive stress layer can offset some of the tensile stress generated by the working load, improve the fatigue resistance of the workpiece, and enhance the wear resistance and corrosion resistance, so that the workpiece can better maintain its performance in harsh environments, extend its service life, and improve the overall quality and reliability of the product. By using micro-shot peening to reduce the surface roughness Ra to ≤ 0.6 μm, the surface finish of the workpiece can be significantly improved, enhancing its wear resistance, fatigue resistance, and corrosion resistance, thereby improving the appearance quality of the workpiece and increasing its performance and service life in practical applications.

[0025] In step one, a dynamic compensation mechanism is adopted for the mold clearance. During the stamping process, the clearance change is monitored in real time by a piezoelectric sensor. When the deviation exceeds the set value by 5%, the slider position is automatically adjusted.

[0026] The piezoelectric sensor works based on the piezoelectric effect. When the mold gap changes, causing the pressure to change, it generates an electrical signal proportional to the pressure. This electrical signal is transmitted to the control system and compared with the preset mold gap value. When the deviation exceeds the set value by 5%, the control system issues a command to change the mold gap by adjusting the slider position, thereby achieving dynamic compensation. During the stamping process, the die clearance will change due to wear and temperature changes. The dynamic compensation mechanism can respond to these changes in a timely manner to ensure that the die clearance is always in the optimal state. A stable die clearance is not only crucial to ensuring the dimensional accuracy of stamped parts, but also reduces abnormal wear between die components, extends the overall service life of the die, and reduces production costs. The dynamic compensation mechanism for die clearance can maintain the die clearance within the set range in real time, significantly improving the consistency of dimensional accuracy of stamped parts, reducing scrap rate, increasing production efficiency, and extending die life.

[0027] In step two, the working surface of the stamping die is coated with a 2-3μm thick diamond-like carbon film layer. After coating, the surface hardness reaches HV3000-3500, and the stamping equipment is equipped with a feeding mechanism with a feeding positioning accuracy of ±0.01mm.

[0028] Diamond-like carbon film is an amorphous carbon film formed on the surface of a mold by physical vapor deposition or chemical vapor deposition. It has high hardness, low coefficient of friction and good chemical stability. It can effectively resist the friction and wear between the material and the mold surface during the stamping process. The low coefficient of friction makes the stamped parts easier to demold and reduces scratches on the workpiece surface. During the stamping process, the working surface of the die is subjected to enormous pressure and friction, which can easily cause wear and corrosion. Coating with a diamond-like carbon film can form a strong and smooth protective film on the die surface, which can greatly reduce the wear rate of the die, reduce the dimensional deviation and surface defects of the stamped parts caused by die wear, and the good demolding performance can help improve production efficiency and reduce workpiece damage caused by demolding difficulties. After the working surface of the stamping die is coated with a 2-3μm thick diamond-like carbon film, the wear resistance, corrosion resistance and demolding performance of the die are significantly improved, thereby improving the surface quality of the stamped parts, reducing the die maintenance cost, extending the die service life, and ensuring the stability and continuity of the production process.

[0029] The feeding mechanism typically consists of a motor, a transmission device, and a positioning device. The motor provides power, which is transmitted to the feeding components through the transmission device to realize the material conveying. The positioning device uses photoelectric sensors and encoder technology to detect the feeding position and feeds the signal back to the control system. The control system adjusts the movement of the feeding mechanism in real time according to the preset feeding distance and accuracy requirements to ensure feeding positioning accuracy. Precise feeding and positioning is one of the key links to ensure the dimensional accuracy of stamped parts. The accurate and consistent feeding position each time ensures that the stamped parts are processed in the same mold position, avoiding dimensional errors caused by feeding deviation. This not only improves product quality but also reduces scrap caused by dimensional defects, thereby improving production efficiency and material utilization. The stamping equipment is equipped with a feeding mechanism with a feeding positioning accuracy of ±0.01mm, ensuring accurate feeding position each time, improving the consistency of stamped parts dimensional accuracy, reducing scrap rate, and achieving automated and efficient production.

[0030] An online inspection process is set between steps two and three. The online inspection process uses a laser 3D scanner to detect the size of the workpiece in real time. The inspection frequency is 5-8 pieces per minute, and the measurement accuracy is ±2μm.

[0031] Laser 3D scanners utilize the principle of laser ranging. By emitting a laser beam and receiving the reflected light, they calculate the time or phase change of the laser from emission to reception, thereby obtaining the three-dimensional coordinate information of points on the workpiece surface. Through scanning and data processing of a large number of surface points, a three-dimensional model of the workpiece can be reconstructed and compared with the original design model to determine dimensional deviations. The detection frequency is 5-8 pieces per minute, allowing for the timely detection of dimensional change trends by inspecting multiple workpieces within a certain time period. The measurement accuracy of ±2μm ensures the accuracy of the detection data. Real-time detection of workpiece dimensions can promptly capture dimensional changes caused by fluctuations in process parameters and mold wear during the production process. Once a dimensional deviation is found to exceed the allowable range, production can be stopped immediately and relevant process parameters can be adjusted or the mold replaced, avoiding the production of a large number of defective products and reducing production costs. At the same time, the long-term accumulated detection data can be used to analyze the stability and reliability of the production process, providing a strong basis for process optimization and continuously improving product quality. Using a laser 3D scanner to detect workpiece dimensions in real time can promptly identify dimensional deviations during the production process, avoid producing a large number of defective products, ensure stable product dimensional accuracy, improve overall product quality, and provide accurate data support for subsequent process adjustments.

[0032] In step four, gradient cooling uses a multi-channel cooling system. The temperature of the first cooling zone is controlled at 200±10℃, and the temperature of the second cooling zone is controlled at 80±5℃. The transition time between the two zones is ≤2 seconds.

[0033] Step 5, followed by dimensional stabilization treatment: aging treatment at 180-200℃ for 2 hours under nitrogen protection, resulting in a workpiece dimensional change rate ≤0.005%.

[0034] The stamping die adopts a double-layer structure design, with the inner layer being SKD11 die steel and the outer layer being a copper alloy heat dissipation layer. The two layers are connected by vacuum diffusion welding.

[0035] SKD11 mold steel is a commonly used cold work mold steel with high hardness, high wear resistance and good toughness. It can withstand the huge pressure and friction during the stamping process, ensuring the forming accuracy and service life of the mold. Copper alloy has excellent thermal conductivity and can quickly transfer the heat generated during mold operation as a heat dissipation layer. Vacuum diffusion welding is carried out in a high temperature and high vacuum environment, so that the atoms of the two materials diffuse into each other to form a strong metallurgical bond, ensuring a tight connection between the two materials and good heat transfer efficiency. During the stamping process, the die generates a lot of heat due to friction with the material. Excessive temperature can lead to a decrease in die hardness, increased wear, and even thermal fatigue cracks. The double-layer die design dissipates heat in time through the copper alloy heat dissipation layer, which can keep the die working temperature within a reasonable range, reduce thermal fatigue damage, and extend the die service life. The inner layer of SKD11 die steel ensures the high strength and wear resistance of the die and maintains the forming accuracy of the die, thereby producing stamped parts with high dimensional accuracy and good surface quality, reducing production costs and improving production efficiency. The stamping die adopts a double-layer structure design. The inner layer is made of SKD11 die steel, and the outer layer is a copper alloy heat dissipation layer. The two layers are connected by vacuum diffusion welding, which can effectively improve the heat dissipation performance of the die, reduce the temperature of the die during operation, reduce die damage caused by thermal fatigue, extend the service life of the die, and at the same time ensure the high strength and wear resistance of the die, thus improving the quality of stamped parts.

[0036] The material selected is modified DC53 cold work die steel. The composition of modified DC53 cold work die steel includes the following parts by weight: C 1.5-1.6 parts, Si 0.9-1.1 parts, Mn 0.4-0.6 parts, Cr 8.0-8.5 parts, Mo 2.0-2.2 parts, V 0.5-0.7 parts, and the balance Fe.

[0037] In the assembly process following step five, a compensation assembly method is adopted, with a process allowance of 0.005-0.008mm reserved on the key mating surfaces. The final mating clearance of 0.002-0.005mm is achieved through selective grinding.

[0038] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A method for integrating precision stamping and forging, characterized in that, Includes the following steps: Step 1: Use 3D modeling to establish a 3D parametric model of the workpiece. Optimize the stamping speed in the range of 80-120 mm / s through plastic forming simulation, set the die clearance to 3-5% of the material thickness, and predict the distribution of material flow stress. Step 2: Use a servo motor to drive the punch press and perform continuous punching at a frequency of 100-150 times / minute under a punching force of 800-1200kN. During the punching process, keep the die temperature at 80±5℃. Step 3: Place the workpiece in an environment with a vacuum degree ≤1×10⁻³Pa, heat it to 1020-1050℃ at a rate of 15-20℃ / min, hold it at that temperature for 20-30 minutes, and then perform oil quenching. Step 4: Use a gradient cooling process. First, keep the solution in a nitrate bath at 180-220℃ for 5-8 minutes, and then cool it to room temperature at a rate of 30-50℃ / s. Step 5: The surface roughness Ra≤0.6μm is achieved by micro-shot peening. The shot peening medium is ceramic shot with a diameter of 0.1-0.3mm, and the peening pressure is 0.3-0.5MPa.

2. The precision stamping and forging integrated method according to claim 1, characterized in that: In step one, the mold gap adopts a dynamic compensation mechanism. During the stamping process, the gap change is monitored in real time by a piezoelectric sensor. When the deviation exceeds the set value of 5%, the slider position is automatically adjusted.

3. The precision stamping and forging integrated method according to claim 1, characterized in that: In step two, the working surface of the stamping die is coated with a 2-3 μm thick diamond-like carbon film layer. After coating, the surface hardness reaches HV3000-3500, and the stamping equipment is equipped with a feeding mechanism with a feeding positioning accuracy of ±0.01 mm.

4. The precision stamping and forging integrated method according to claim 1, characterized in that: An online inspection process is provided between steps two and three. The online inspection process uses a laser 3D scanner to detect the size of the workpiece in real time. The detection frequency is 5-8 pieces per minute, and the measurement accuracy is ±2μm.

5. The precision stamping and forging integrated method according to claim 1, characterized in that: In step four, gradient cooling employs a multi-channel cooling system, with the temperature of the first cooling zone controlled at 200±10℃ and the temperature of the second cooling zone controlled at 80±5℃, and the transition time between the two zones ≤2 seconds.

6. The precision stamping and forging integrated method according to claim 1, characterized in that: Step five is followed by a dimensional stabilization treatment: an aging treatment at 180-200℃ for 2 hours under nitrogen protection, resulting in a workpiece dimensional change rate of ≤0.005%.

7. The precision stamping and forging integrated method according to claim 3, characterized in that: The stamping die adopts a double-layer structure design, with the inner layer being SKD11 die steel and the outer layer being a copper alloy heat dissipation layer. The two layers are connected by vacuum diffusion welding.

8. The precision stamping and forging integrated method according to claim 1, characterized in that: In step four, an intelligent temperature control algorithm is used to dynamically adjust the cooling intensity based on the temperature changes of different parts of the workpiece, with a temperature control accuracy of ±3℃.

9. The precision stamping and forging integrated method according to claim 1, characterized in that: The material is modified DC53 cold work die steel, which comprises the following parts by weight: C 1.5-1.6 parts, Si 0.9-1.1 parts, Mn 0.4-0.6 parts, Cr 8.0-8.5 parts, Mo 2.0-2.2 parts, V 0.5-0.7 parts, with the balance being Fe.

10. The precision stamping and forging integrated method according to claim 1, characterized in that: The assembly process following step five employs a compensation assembly method, reserving a process allowance of 0.005-0.008mm on key mating surfaces, and achieving a final mating clearance of 0.002-0.005mm through selective grinding.

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