Server case back wall die-casting subsequent stamping treatment device and using method thereof

Abstract

The invention relates to the technical field of server case rear wall production, and discloses a server case rear wall die-casting subsequent stamping treatment device and a using method thereof.The method comprises the following steps that S1, zirconium oxide nanoparticles are added into an aluminum melt, and dispersion distribution of the nanoparticles is achieved through ultrasonic field and electromagnetic field composite treatment; s2, after die casting is completed, burr distribution on the surface of a casting is scanned through a machine vision system, three-dimensional point cloud data is generated, and a stepped stamping path is planned; and S3, the die casting is transferred to a stamping station through gradient temperature control, residual heat of the die casting is used for conducting semi-solid burr stamping, and meanwhile atomized liquid containing nano-silicon dioxide is sprayed. Through the cooperation of waste heat utilization and temperature control, die casting waste heat is used for semi-solid stamping, the lubricating and crack filling effects of nanometer silicon dioxide atomized liquid are combined, stamping energy consumption is reduced, and meanwhile thermal stress residues are reduced through gradient temperature control.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of server case rear wall production, in particular to a server case rear wall die-casting post-stamping processing device and a use method thereof. BACKGROUND

[0002] In the field of manufacturing server case rear walls, die-casting and stamping are two crucial process links. The traditional server case rear wall die-casting post-stamping processing mode has many problems to be solved in terms of energy consumption and product quality control. The introduction of waste heat utilization and temperature control coordination technology provides an innovative idea for solving these problems and brings significant effects, and the gradient temperature control reduces thermal stress residues.

[0003] In the traditional server case rear wall die-casting post-stamping processing, the stamping process usually needs to heat the die-castings to a specific temperature so that the material reaches a suitable plastic state, facilitating the removal of burrs and other defects. However, this heating process often consumes a large amount of energy. The die-casting process is a high-temperature and high-pressure forming process, and the die-castings carry a large amount of residual heat after forming. In the traditional processing mode, this residual heat is often ignored and not effectively utilized. After the die-castings are completed, they are usually placed in the air for natural cooling or directly enter the next process after simple transportation. In this process, the residual heat carried by the die-castings gradually dissipates into the environment, causing energy waste. SUMMARY

[0004] In view of the deficiencies of the prior art, the application provides a server case rear wall die-casting post-stamping processing device and a use method thereof, which solves the problem of energy waste in die-casting and stamping processing.

[0005] To achieve the above purpose, the application is implemented by the following technical scheme: a server case rear wall die-casting post-stamping processing use method, comprising the following steps: S1, adding zirconia nanoparticles to the aluminum melt, and realizing the dispersion distribution of the nanoparticles through the composite treatment of the ultrasonic field and the electromagnetic field; S2, after die-casting is completed, scanning the burr distribution on the surface of the casting through a machine vision system, generating three-dimensional point cloud data and planning a stepped stamping path; S3, the die-castings are transferred to the stamping station through gradient temperature control, and semi-solid burr stamping is performed using the residual heat of the die-castings, while spraying atomized liquid containing nano-silicon dioxide; S4, the aluminum chips generated by stamping are returned to the die-casting smelting furnace through a pneumatic conveying system, and the recycling process is controlled by vacuum filtration and online metering.

[0006] By the above scheme: the present application keeps the residual temperature of the die casting by the gradient temperature control transfer channel, uses the semi-solid state for burr stamping, saves the additional heating link, combines the temperature control and greatly reduces the energy consumption; at the same time, the gradient temperature control precisely controls the temperature change rate in the transfer process of the die casting, avoids the generation of excessive thermal stress due to sudden cooling and sudden heating, reduces the residual stress in the die casting, reduces the deformation risk in subsequent use, improves the energy utilization efficiency, guarantees the stability of the server case rear wall structure, realizes the dual benefits of energy saving and quality improvement.

[0007] Preferably, the particle size of the zirconium oxide nanoparticles is 50-100 nm, the mass ratio is 0.5%-1%, the aluminum melt temperature is 680-720℃, the ultrasonic field frequency is 10-30 kHz, the power is 300-2000 W, the electromagnetic field frequency is 20-100 Hz, the intensity is 50-200 A / m, and the ultrasonic treatment time is 1-5 minutes, so that the nanoparticles form a dispersion network with an average spacing of ≤5 μm in the matrix.

[0008] Preferably, the machine vision system is composed of an industrial camera with a resolution of ≥20 million pixels, a polarized light source, and a burr analysis module with high-precision burr analysis capability, and the stamping path is a gradient pressure function: ; wherein d is the burr height, λ=0.2mm is the attenuation coefficient, the burr recognition accuracy of the system can reach ±0.005mm, and when the number of burrs per unit area is ≥100 / cm 2 , the stepwise stamping program is automatically triggered to ensure timely and accurate processing of the surface of the die casting.

[0009] Preferably, in the step S2, the stepwise stamping path adopts a multi-stage pressure gradient design: the first stage pressure is set to be below 50% of the maximum stamping pressure, this stage performs preliminary positioning and pre-pressing to reduce the impact of the punch on the die casting; the second stage pressure is quickly raised to 80%-100%, and the punch displacement resolution is controlled to be 0.1-0.5mm.

[0010] Preferably, the temperature of the gradient temperature control transfer channel is accurately controlled at 80-120℃ to ensure that the die casting maintains a stable residual temperature state during the transfer process, and the stamping die is equipped with a local constant temperature module, which controls the temperature of the circulating heat oil through a micro-channel, and the temperature range is 80-150℃.

[0011] Preferably, the particle size of the nano-silicon dioxide atomized liquid is 50-100 nm, which is sprayed through a high-pressure atomizing nozzle with a nozzle aperture of 50-100 μm, and forms a gas-liquid two-phase flow with high-pressure gas of 0.8-1.2 MPa, the gas-liquid mixing ratio is 1:5-1:10, and the pH value of the atomized liquid is 9-11.

[0012] Preferably, the pneumatic conveying system adopts negative pressure suction with vacuum degree ≤-50kPa and cyclone separator, and the recycled material with particle size ≤2mm is directly remelted.

[0013] Preferably, the temperature of the die casting entering the stamping station is ≥80℃, the atomizing liquid flow is 20-30ml / s, and burr stripping and micro-crack filling are performed.

[0014] Preferably, the die casting mechanism comprises an upper die and a lower die, and the grouting port is installed.

[0015] Preferably, the stamping die is symmetrically arranged.

[0016] The application provides a server chassis rear wall die casting post-stamping processing device and a use method thereof. 1. The application utilizes the residual heat of the die casting for semi-solid stamping through the cooperation of waste heat utilization and temperature control, reduces the stamping energy consumption by combining the lubrication and crack filling effect of nano-silicon dioxide atomizing liquid, and reduces the thermal stress residue through gradient temperature control.

[0017] 2. The application realizes the uniform dispersion of zirconium oxide nanoparticles in aluminum melt through an ultrasonic-electromagnetic composite field, forms a dense dispersion phase structure, significantly improves the material hardness and improves the crystallization morphology, and provides a high plasticity-high hardness balanced matrix for subsequent stamping.

[0018] 3. The application breaks through the traditional fixed die stamping mode through burr three-dimensional modeling and dynamic path planning based on machine vision, reduces die impact damage through a stepped pressure strategy, and improves the processing precision of complex structural parts. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 The figure is a process flow diagram of the application; Figure 2 The figure is a stamping die and server chassis rear wall combination diagram of the application; Figure 3 The figure is a stamping die local structure diagram of the application; Figure 4 The figure is an upper die local structure diagram of the application; Figure 5 The figure is a lower die local structure diagram of the application.

[0020] 1. Stamping die; 2. Server chassis rear wall; 3. Upper die; 4. Lower die; 5. Grouting port. DETAILED DESCRIPTION

[0021] The technical solutions of the present application will be described clearly and completely below in combination with the drawings of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0022] Please refer to the drawings of the present application Figure 1 The embodiment of the present application provides a method for using a server chassis rear wall die casting post-stamping process, comprising the following steps: S1, adding zirconia nanoparticles to the aluminum melt, and realizing the dispersion distribution of the nanoparticles through the composite treatment of the ultrasonic field and the electromagnetic field; S2, after die casting is completed, scanning the burr distribution on the surface of the casting through a machine vision system, generating three-dimensional point cloud data and planning a stepped stamping path; S3, the die casting is transferred to the stamping station through gradient temperature control, and semi-solid burr stamping is performed using the residual temperature of the die casting, while spraying atomized liquid containing nano-silicon dioxide; S4, the aluminum chips generated by stamping are returned to the die casting smelting furnace through a pneumatic conveying system, and the recycling process is controlled by vacuum filtration and online metering of the melt composition.

[0023] Specifically, in the S1 step: zirconia nanoparticles are added to the aluminum melt, and during the adding process, the dispersion distribution of the nanoparticles is realized through the composite treatment of the ultrasonic field and the electromagnetic field. The ultrasonic field can produce high-frequency vibration to promote the rapid dispersion of the nanoparticles in the aluminum melt and break the agglomeration phenomenon; the electromagnetic field further adjusts the distribution state of the nanoparticles by using its electromagnetic force, so that the nanoparticles are more uniformly dispersed in the aluminum melt, and finally a dispersion network with an average spacing ≤5 μm is formed in the matrix, thereby significantly improving the mechanical properties of the material; S2 step: after die casting is completed, the machine vision system is used to scan the burr distribution on the surface of the casting, three-dimensional point cloud data are generated, and based on these data, the system can plan a stepped stamping path to ensure effective treatment of burrs with different heights and distributions. When the number of burrs per unit area reaches the preset value, the system will automatically trigger the stepped stamping program to timely and accurately process the surface of the casting; S3 step: the die casting is transferred to the stamping station through gradient temperature control, and the temperature control of the gradient temperature control transfer channel ensures that the die casting maintains a stable residual temperature state during the transfer process. The residual temperature of the die casting is used for semi-solid burr stamping, at this time the material is in a semi-solid state, combining the characteristics of solid and liquid, which is beneficial to the removal of burrs, while reducing energy consumption and wear on the mold. In the process of stamping, the atomized liquid containing nano silicon dioxide is sprayed at the same time. Nano silicon dioxide has the characteristics of small size effect and high specific surface area, and the atomized liquid can fill the micro-cracks generated during the removal of burrs, improving the surface quality of the casting; S4 step: the aluminum scraps generated by stamping are recycled to the die casting smelting furnace through the pneumatic conveying system. The pneumatic conveying system uses negative pressure suction method to suck the aluminum scraps into the pipeline, and separates and purifies the aluminum scraps through a cyclone separator. The recycled aluminum scraps can be directly remelted in the furnace, realizing the recycling of resources. During the recycling process, the melt composition is controlled through vacuum filtration and online metering to ensure that the composition of the aluminum liquid after remelting meets the die casting requirements, ensuring the stability of the server case back wall quality.

[0024] The particle size of zirconia nanoparticles is 50-100 nm, the mass ratio is 0.5%-1%, the aluminum melt temperature is 680-720℃, the ultrasonic field frequency is 10-30 kHz, the power is 300-2000 W, the electromagnetic field frequency is 20-100 Hz, the intensity is 50-200 A / m, and the ultrasonic treatment time is 1-5 minutes. The nanoparticles form a dispersion network with an average spacing of ≤5 μm in the matrix.

[0025] Specifically, the particle size of zirconia nanoparticles is 50-100 nm, which forms a good interface with the aluminum matrix in this particle size range. The mass ratio is 0.5%-1%, which can effectively improve the material performance, and will not cause high cost or affect other properties of the material due to excessive addition. The aluminum melt temperature is 680-720℃, which has good fluidity at this temperature interval, which is beneficial to the uniform dispersion of nanoparticles. The ultrasonic field frequency is 10-30 kHz, and the power is 300-2000 W. The appropriate frequency and power can generate enough ultrasonic energy to achieve effective dispersion of nanoparticles. The electromagnetic field frequency is 20-100 Hz, and the intensity is 50-200 A / m, which cooperates with the ultrasonic field to further optimize the distribution of nanoparticles. The ultrasonic treatment time is 1-5 minutes, which ensures that the nanoparticles are fully dispersed in the aluminum melt under the joint action of ultrasonic field and electromagnetic field, forming a dispersion network with an average spacing of ≤5 μm, which significantly improves the strength, hardness and wear resistance of the material.

[0026] The machine vision system is composed of an industrial camera with a resolution of ≥20 million pixels, a polarized light source, and a burr analysis module with high-precision burr analysis capability. The stamping path is a gradient pressure function: ; wherein d is the burr height, λ = 0.2mm is the attenuation coefficient, and the burr recognition accuracy of the system can reach ±0.005mm, when the number of burrs per unit area is ≥100 / cm 2 , the automatic step stamping program is triggered to ensure timely and accurate processing of the surface of the casting.

[0027] Specifically, the industrial camera selects a face array industrial camera with a resolution of ≥20 million pixels, and the pixel size is not greater than 3.45μm×3.45μm, which ensures that the small burr details can be clearly captured during the detection of the surface of the casting after die casting. The camera is equipped with a C-mount lens interface, which is suitable for high-resolution industrial lenses. The focal length of the lens is 8-50mm according to the detection distance and field of view requirements of the casting, which provides a high-quality image source for accurate burr recognition. The polarized light source adopts a ring-shaped polarized light source, and the wavelength range of the light source is 450-650nm. The natural light is converted into linearly polarized light through a polarizer, which effectively suppresses the glare interference caused by the high reflectivity of the aluminum material on the surface of the casting. The brightness of the light source can be controlled by PWM dimming control. According to the different surface roughness of the casting, the best light intensity is matched to make the gray difference between the burr and the casting body ≥30, which improves the accuracy of burr feature extraction. The burr analysis module is based on a deep learning framework and is trained on a data set of 10,000+ images of the back wall of the server cabinet casting surface under different burr shapes and different die casting process parameters. The module first performs image preprocessing including denoising, gray correction and edge enhancement, then uses a convolutional neural network to extract the geometric features of the burr including height, width, area and distribution density, and finally plans a stamping path according to the gradient pressure function ; wherein d is the burr height, λ = 0.2mm is the attenuation coefficient, and k is a correction coefficient adapted to the maximum pressure of the stamping equipment. According to the actual stamping die pressure range, k is calibrated to be between 500-5000N. The burr recognition accuracy of the module can reach ±0.005mm, when the number of burrs per unit area is ≥100 / cm2, the automatic step stamping program is triggered, and the response time is ≤0.5s, which ensures timely and accurate processing of the surface of the casting. After the program is triggered, the stamping equipment control system can be linked to automatically adjust the pressure and displacement parameters of the stamping head according to the planned path.

[0028] In step S2, the step stamping path adopts a multi-stage pressure gradient design: the first stage pressure is set to be below 50% of the maximum stamping pressure, which performs preliminary positioning and pre-pressing to reduce the impact of the punch on the casting; the second stage pressure is quickly increased to 80%-100%, and the punch displacement resolution is controlled to be 0.1-0.5mm to ensure accurate control of the stamping process at different pressure stages.

[0029] Specifically, in step S2, the stepped stamping path adopts a multi-stage pressure gradient design. The first stage pressure is set to be below 50% of the maximum stamping pressure, which is mainly used for preliminary positioning and pre-pressing. Due to the uneven distribution of surface burrs of the casting, lower pressure can enable the punch to preliminarily contact and position the surface without damaging the casting, reduce the impact of the punch on the casting, and avoid deformation or damage of the casting surface caused by excessive pressure. The second stage pressure is rapidly increased to 80%-100%, and the punch displacement resolution is controlled at 0.1-0.5 mm. In this stage, the higher pressure can effectively remove the burrs, and the accurate punch displacement resolution ensures accurate control of the stamping process at different pressure stages, so that the punch can accurately perform stamping operation according to the actual height and shape of the burrs, ensuring clean burr removal and ensuring the flatness and quality of the casting surface.

[0030] The temperature of the gradient temperature control transfer channel is accurately controlled at 80-120℃, ensuring that the die casting maintains a stable residual temperature state during the transfer process. The stamping die is equipped with a local constant temperature module, which controls the temperature through micro-channel circulation of heat conduction oil, with a temperature range of 80-150℃.

[0031] Specifically, the gradient temperature control transfer channel adopts advanced temperature control technology, which accurately controls the temperature at 80-120℃ through the cooperative work of heating elements, temperature sensors and control systems. During the transfer process of the die casting, the stable temperature environment can ensure the stability of the residual temperature state of the die casting, avoid the change of material properties caused by rapid temperature change, and affect the subsequent semi-solid burr stamping effect. The stamping die is equipped with a local constant temperature module, which controls the temperature through micro-channel circulation of heat conduction oil. The heat conduction oil circulates in the micro-channel, taking away or providing heat, and accurately adjusting the temperature of the die. The temperature range is 80-150℃, which can meet the requirements of semi-solid stamping for die temperature, ensure the stable working state of the die during stamping, improve the precision and efficiency of stamping, and prolong the service life of the die.

[0032] The particle size of the nano-silicon dioxide atomized liquid is 50-100 nm, which is sprayed through a high-pressure atomizing nozzle with a nozzle aperture of 50-100 μm. The gas-liquid two-phase flow is formed with high-pressure gas of 0.8-1.2 MPa, and the gas-liquid mixing ratio is 1:5-1:10, and the atomized liquid pH value is 9-11.

[0033] Specifically, the particle size of the nano-silicon dioxide atomized liquid is 50-100 nm, and the small particle size of the nano-silicon dioxide can better fill the micro-cracks and improve the surface quality of the castings. Through the high-pressure atomizing nozzle, the nozzle aperture is 50-100 μm, and under the action of high pressure, the atomized liquid can be fully atomized into small particles. Forming a gas-liquid two-phase flow with high-pressure gas of 0.8-1.2 MPa, the gas-liquid mixing ratio is 1:5-1:10. In this gas-liquid mixing state, the atomized liquid can be more uniformly sprayed to the stamping area, covering the burrs and micro-cracks on the surface of the castings. The pH value of the atomized liquid is 9-11, which is weakly alkaline. This alkaline environment helps the nano-silicon dioxide to react with the aluminum matrix during the stamping process, enhances the filling effect, and further improves the surface performance of the castings.

[0034] The pneumatic conveying system uses negative pressure suction with a vacuum degree of ≤-50 kPa and a cyclone separator, and the purity of the aluminum scrap recovered is ≥99%, and the recovered material with a particle size of ≤2 mm is directly remelted in the furnace.

[0035] Specifically, the pneumatic conveying system uses negative pressure suction with a vacuum degree of ≤-50 kPa, and the aluminum scrap generated by stamping is sucked into the conveying pipeline by the negative pressure generated by the vacuum pump. In the pipeline, the aluminum scrap moves with the airflow and is separated by a cyclone separator with a separation efficiency of ≥99.5%. The cyclone separator uses the principle of centrifugal force to separate the aluminum scrap from the airflow, achieving gas-solid separation. The purity of the recovered aluminum scrap is ≥99%, and after strict separation and purification process, impurities are removed to ensure the quality of the aluminum scrap. When the particle size of the recovered material is ≤2 mm, it can be quickly melted in the die casting melting furnace due to its small size, and directly remelted in the furnace, realizing efficient recycling of aluminum resources, reducing production costs, and reducing environmental pollution.

[0036] The residual temperature of the die casting entering the stamping station is ≥80℃, and the atomized liquid flow is 20-30 ml / s, achieving burr stripping and micro-crack filling.

[0037] Specifically, the residual temperature of the die casting entering the stamping station is ≥80℃, and in this temperature range, the die casting is in a semi-solid state, and the material has good plasticity and flowability, which is beneficial to the stripping of burrs. At the same time, the high residual temperature can reduce the energy consumption in the stamping process and improve the stamping efficiency. The flow rate of the atomized liquid is 20-30 ml / s, which can ensure that the atomized liquid is continuously and uniformly sprayed to the stamping area during the stamping process, and the micro-cracks generated after the burr stripping are filled in time. By reasonably controlling the residual temperature of the die casting and the flow rate of the atomized liquid, the synergistic effect of burr stripping and micro-crack filling is achieved, effectively improving the surface quality and performance of the server case rear wall castings.

[0038] Please refer to the attached Figure 2 -attached Figure 3, including a die-casting mechanism, the die-casting mechanism includes an upper die 3 and a lower die 4, and the die-casting mechanism is provided with a pouring port 5.

[0039] Specifically, the upper die 3 and the lower die 4 are accurately matched through a guide device, so as to ensure accurate die closing during die casting and guarantee the dimensional accuracy of the castings. The pouring port 5 is provided, and the aluminum melt is injected into the mold cavity through the pouring port 5. During the die casting process, the upper die 3 and the lower die 4 exert pressure on the aluminum melt under the action of the press, so that the aluminum melt rapidly solidifies and forms the required server case rear wall 2 casting in the mold cavity.

[0040] Please refer to the attached Figure 4 -attached Figure 5 , and the stamping die 1 is symmetrically arranged.

[0041] Specifically, the symmetrically arranged stamping die 1 can exert uniform pressure on the surface of the casting during stamping, guarantee the consistency of burr removal and the flatness of the surface, and can simultaneously stamp two server case rear walls 2. The stamping die 1 is made of high-strength alloy steel. The die ensures that the burrs can be smoothly removed during stamping, and at the same time protects the surface of the die from damage, prolonging the service life of the die. During the stamping process, the stamping die 1 is in close contact with the surface of the server case rear wall 2, and through the reciprocating motion of the punch, the burrs are stamped and removed, realizing the subsequent stamping treatment of the server case rear wall 2 casting.

[0042] The use method of the server case rear wall die-casting subsequent stamping treatment in the embodiment, 1. First, nano-aluminum melt pretreatment and nano-particle dispersion, wherein the material parameters are: aluminum melt temperature: 700℃, zirconia nano-particles: particle size 80nm, mass ratio 0.8%, followed by composite field treatment: ultrasonic field: frequency 20kHz, power 1500W, treatment time 3 minutes, electromagnetic field: frequency 50Hz, intensity 100A / m.

[0043] Effect verification: The dispersion network is observed by a scanning electron microscope, the average distance between particles is ≤5μm, and a dense dispersion phase structure is formed; Hardness test: Vickers hardness is increased from 120 of the matrix to 145, and the crystalline morphology is changed from coarse dendrites to fine equiaxed crystals.

[0044] 2. Intelligent stamping path dynamic planning Machine vision burr detection and path planning system configuration: Industrial camera: resolution 2400 million pixels, pixel size 3.45 μm x 3.45 μm, lens focal length 25 mm. Polarized light source: wavelength 550 nm, brightness 20000 lux. Burr analysis module: based on CNN algorithm, training data set contains 12000 images, burr recognition accuracy ± 0.005 mm. Path planning: step pressure strategy: first stage: pressure 30% maximum, second stage: pressure 90% maximum. Trigger condition: burr number per unit area ≥100 pieces / cm 2 The program is automatically started.

[0045] Effect verification: Burr removal rate: 98%, traditional fixed mold stamping 85%.

[0046] Mold damage detection: punch surface wear reduction by 40%, mold life extended to 20000 times of stamping, traditional process 8000 times.

[0047] 3. Waste heat utilization and temperature control coordination Semi-solid stamping and nanometer atomized liquid coordination processing, temperature control: gradient temperature control transfer channel: temperature 100℃±2℃. Local constant temperature module of stamping die: temperature 120℃, controlled by micro-channel heat conduction oil circulation. Atomized liquid parameters: nano silicon dioxide particle size 80nm, nozzle aperture 80μm, gas-liquid mixing ratio 1:8, atomized liquid pH value 10. Spray flow: 25ml / s.

[0048] Effect verification: Energy consumption reduction: stamping energy consumption from traditional process 15kWh / kg to 10kWh / kg.

[0049] Thermal stress control: casting deformation ≤0.08mm, traditional process 0.3mm, surface flatness improved by 70%.

[0050] Although embodiments of the present application have been shown and described, it is to be understood that various modifications, substitutions, replacements and changes can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A method for server chassis back wall die casting post-stamping process, characterized in that, It comprises the following steps: S1, adding zirconia nanoparticles in aluminum melt, realizing the dispersion distribution of nanoparticles by the composite treatment of ultrasonic field and electromagnetic field; S2, after the completion of die casting, scanning the burr distribution on the surface of the casting by machine vision system, generating three-dimensional point cloud data and planning the stepped stamping path; S3, transferring the die casting to the stamping station through gradient temperature control, using the residual temperature of the die casting for semi-solid burr stamping, and spraying atomized liquid containing nanosilica at the same time; S4, the aluminum scraps generated by stamping are returned to the die casting smelting furnace through the pneumatic conveying system, and the recycling process is controlled by vacuum filtration and online metering.

2. The method for using the die-casting post-punching processing of the server case rear wall according to claim 1, characterized in that, The particle size of zirconia nanoparticles is 50-100 nm, the mass ratio is 0.5%-1%, the temperature of aluminum melt is 680-720℃, the ultrasonic field frequency is 10-30 kHz, the power is 300-2000 W, the electromagnetic field frequency is 20-100 Hz, the intensity is 50-200 A / m, and the ultrasonic treatment time is 1-5 minutes, so that the nanoparticles form a dispersion network with an average spacing of ≤5 μm in the matrix.

3. The method for post-die-casting stamping treatment of the rear wall of a server chassis according to claim 1, characterized in that, The machine vision system is composed of an industrial camera with a resolution of ≥2000 million pixels, a polarized light source, and a burr analysis module with high-precision burr analysis capability, and the stamping path is a gradient pressure function: ; Wherein d is the burr height, λ=0.2mm is the attenuation coefficient, the burr recognition accuracy of the system can reach ±0.005mm, when detecting the number of burrs per unit area ≥100 / cm 2 , the automatic trigger step stamping program is triggered to ensure timely and accurate processing of the surface of the casting.

4. The method of claim 3, wherein the method further comprises: In the step S2, the stepped stamping path adopts a multi-stage pressure gradient design: the first stage pressure is set to be below 50% of the maximum stamping pressure, the preliminary positioning and pre-pressing are performed in this stage to reduce the impact of the punch on the casting; the second stage pressure is quickly raised to 80%-100%, and the punch displacement resolution is controlled to be 0.1-0.5 mm.

5. The method of claim 1, wherein the method further comprises: providing a server enclosure rear wall; and providing a server enclosure rear wall die cast post-stamping process using the server enclosure rear wall. The temperature of the gradient temperature control transfer channel is accurately controlled at 80-120℃ to ensure that the die casting maintains a stable residual temperature state during the transfer process, and the stamping die is equipped with a local constant temperature module, which controls the temperature through micro-channel circulating heat oil, and the temperature range is 80-150℃. ​ 6. The method of using a server enclosure rear wall die cast post-stamping process of claim 1, wherein, The particle size of nanosilica atomized liquid is 50-100 nm, which is sprayed through a high-pressure atomizing nozzle with a nozzle aperture of 50-100 μm, and forms a gas-liquid two-phase flow with high-pressure gas of 0.8-1.2 MPa, the gas-liquid mixing ratio is 1:5-1:10, and the pH value of the atomized liquid is 9-11.

7. The method of using a server enclosure rear wall die cast post-stamping process of claim 1, wherein, The pneumatic conveying system uses negative pressure suction with a vacuum degree of ≤-50 kPa and a cyclone separator, and when the particle size of the recovered material is ≤2 mm, it is directly returned to the furnace for remelting.

8. The method of using a server enclosure rear wall die cast post-stamping process of claim 1, wherein, The residual temperature of the die casting entering the stamping station is ≥80℃, the flow rate of the atomized liquid is 20-30 ml / s, and the burrs are stripped and the micro-cracks are filled.

9. The method of claim 1, wherein the apparatus is a server enclosure rear wall die casting post-stamping process. It comprises a die casting mechanism, which comprises an upper die (3) and a lower die (4), and a grouting port (5) is installed.

10. The method of claim 1, wherein the apparatus is a server enclosure rear wall die casting post-stamping process. It also comprises a stamping die (1), which is symmetrically arranged.

Images