Stamping dynamic stress-structure evolution cooperative control method for frame sleeve

Abstract

The invention discloses a frame sleeve stamping dynamic stress-structure evolution cooperative control method, and relates to the technical field of metal material stamping forming, and the method comprises the following steps: nano structure programming based on stress wave mode modulation, magnetic phonon coupling regulation and control, energy dissipation structure precise manufacturing, crystal orientation dynamic locking and damping mode activation; according to the invention, through coupling of a space-time modulation stress matrix and a magnetic phonon, a layered structure is converted into a frequency selective damping structure; by means of a nano trap and double-gradient loading, broadband damping coverage is achieved, the strength is kept, and the fatigue life is prolonged in combination with chaos control; the energy absorption rate is improved through stress partial tensor matching and multi-field optimization, a three-level collaborative system is formed through nano closed-loop control, traditional limitation is broken through, and full-band high damping and multi-target optimization are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of metal material stamping and forming, and in particular to a method for coordinated control of dynamic stress and structural evolution in stamping of a vehicle frame sleeve. Background Art

[0002] As a core load-bearing component of the automotive chassis, the mechanical properties of the frame sleeve directly impact the vibration durability and safety reliability of the vehicle. During high-speed stamping, dynamic stress-induced microstructural evolution is a key factor in determining sleeve performance. Existing technologies prioritize microstructural uniformity. Based on phenomenological theories such as the JC constitutive model, these technologies strive to eliminate microstructural heterogeneity caused by dynamic stress by optimizing mold temperature and adjusting stamping speed, thereby meeting the uniformity requirement of GB / T3077-2015, which states "grain size difference ≤ 1 grade." This system focuses on the regulation of macroscopic phase transformation products (such as the martensite / bainite ratio) and traditional mechanical properties (tensile strength ≥ 800 MPa). Its underlying logic is rooted in the industry consensus that microstructural heterogeneity equates to performance defects.

[0003] Therefore, there are the following technical bottlenecks and cognitive limitations: 1. Blind spots in the cognitive function value of the hierarchical organizational scale effect: During high-strain-rate stamping, a "stress gradient-induced lamellar structure" forms at the edge of the sleeve flange, with the spacing between the ferrite / pearlite lamellae varying regularly by 20%-30% / MPa with the dynamic stress amplitude. However, existing techniques consistently consider this phenomenon a "stamping defect": Shawky et al. (Journal of Materials Processing Technology, 2020) focus solely on its negative impact on strength consistency. Existing techniques avoid this structure formation through process speed reduction and focus on multi-station stress compensation to suppress structural abnormalities. The inherent connection between lamellar structure gradients and material damping properties has long been overlooked, and its potential as a functional carrier has not been explored.

[0004] (2) Faults in functional design: The performance control of existing frame sleeves is limited to traditional mechanical indicators such as strength and toughness, and there is a lack of functional design such as vibration damping. The fundamental reason is: Lack of dynamic stress-lamellar scale mapping models: Existing constitutive models (such as the ABAQUS modified JC model) only describe the relationship between macroscopic stress and phase transition product types, and do not involve quantitative control of scale parameters such as submicron lamellar spacing and orientation distribution. As a result, it is impossible to establish a functional relationship between stress parameters (amplitude / frequency / loading path) and lamellar scale; Lack of performance synergistic control technology: When inducing layered structures, traditional methods fail to resolve the "strength-damping" coupling contradiction, which often leads to the inability of the key mechanical properties of the sleeve to meet the load-bearing requirements, exposing the capability gap of existing technologies in the field of multi-objective performance optimization.

[0005] (3) The subversive cognitive gap of cross-scale control theory: Limited by the framework of continuum mechanics, technicians assumed that microstructural uniformity control could be achieved by averaging equivalent stresses, ignoring the cross-scale energy dissipation differences between nanograin boundary behavior and macroscopic stress wave propagation. This discrepancy induces chaos in the stress-microstructure mapping at high strain rates, rendering traditional feedforward control strategies ineffective. Essentially, existing technologies fail to recognize that the scale evolution of layered microstructures is a cross-scale physical process independent of macroscopic phase transitions, leaving relevant multiscale coupled control theories unresolved.

[0006] In view of this, a frame sleeve stamping dynamic stress-structure evolution coordinated control method is provided to overcome the above problems. Summary of the Invention

[0007] The purpose of the present invention is to provide a method for collaboratively controlling dynamic stress and structural evolution of a vehicle frame sleeve during stamping, so as to solve the problems raised in the above-mentioned background technology.

[0008] To solve the above technical problems, the present invention provides a method for collaboratively controlling dynamic stress and structural evolution during stamping of a vehicle frame sleeve, comprising the following steps: Nanostructured programming based on stress wave modal modulation: constructing a spatiotemporal modulated stress matrix, inducing interface kinks through the superposition of multi-frequency stress waves and standing wave fields, making the interlaminar spacing respond dynamically to the stress frequency; Utilizing magneto-phonon coupling control: Through the magnetostrictive effect and high-frequency switching of the superconducting magnetic field, it is used for quantized control of the interlamellar spacing; Precision manufacturing of energy dissipation structures: Constructing nanoscale trap arrays and implementing gradient layered tissue growth control to form damping functional units that match the vibration frequency; Dynamic locking of crystal orientation and damping mode activation: Through phonon spectrum matching orientation control and damping mode activation mechanism, helical tissue with anisotropic damping is constructed.

[0009] Furthermore, the spatiotemporal regulation stress matrix is ​​constructed as follows: The three-frequency stress wave superposition is used to simulate the actual working stress environment. The anti-phase loading units are set on the symmetric surface of the mold to form a stress standing wave field. The micro-laser array controlled by DMD realizes nanoscale non-uniform stress distribution, and the stress gradient is controlled to less than 10MPa / μm.

[0010] Furthermore, in the magneto-phonon coupling control, the pulsed magnetic field frequency resonates with the ferrite (110) crystal plane phonon vibration frequency of 18kHz. The 100kHz magnetic field is switched at a low temperature of 77K using a yttrium barium copper oxide superconducting coil. The interlamellar spacing control satisfies the quantized step formula: ; in: is the initial layer spacing; is the number of pulses; is the quantized step under resonance conditions.

[0011] Furthermore, in the construction of the nanotrap array, a herringbone-shaped nano-groove is used to match the geometric resonance of the layer. The groove has a side length of 50nm and a depth of 30nm. Combined with the Zr-based amorphous alloy layer, it forms a 0.2-0.3eV energy barrier. The energy barrier satisfies the formula: ; in: is the Boltzmann constant; is the absolute temperature; 、 are the coordination numbers of amorphous and crystalline atoms, respectively.

[0012] Furthermore, a dual-gradient loading strategy is used to control the growth of gradient layered tissues: A stress wave with a fundamental frequency of 8 kHz and a modified pulse of 30 kHz was applied to the main area, and a double gradient loading with a stress amplitude of 600-1200 MPa and a frequency of 10-25 kHz was applied to the edge area. The interlaminar spacing was distributed according to the Fibonacci sequence, satisfying the following: ; Initial value .

[0013] Furthermore, in the phonon spectrum matching orientation control, the stress deviator satisfies: ; in: Ferrite <110> Crystalline phonon energy; is the Burgers vector; Using spiral phase stress wave, the stress principal axis rotates at an angular velocity of 10° / μs, combined with 25kHz ultrasonic vibration, the crystal orientation difference and peak frequency satisfy the formula: ; in: : stress wave propagation velocity; : interlamellar spacing; : shear modulus; :density; : misorientation angle.

[0014] Furthermore, in the damping mode activation mechanism, a pulse current is used to induce the formation of nanotwins at the grain boundary to reduce the interface slip resistance. Combined with the neural network optimization of the three physical fields of stress, temperature, and magnetic field, the damping ratio at the target frequency is improved. The interface slip resistance satisfies the formula: ; in: is the original resistance; is the drag reduction caused by nanotwinning; is the twin crystal volume fraction.

[0015] Furthermore, an AFM force sensor is used to close the loop to control the grain rotation torque, and a recursive neural network is used to optimize the stress wave frequency, mold temperature, and magnetic field strength. The optimal combination of interlamellar spacing, orientation difference, and damping ratio is input, and the training data comes from nanoscale molecular dynamics simulations.

[0016] Compared with the prior art, the present invention has the following beneficial effects: Transforming layered defects into functional carriers: By inducing kinks at the laminar interfaces through a standing wave field, the stress gradient-induced layered structure, traditionally considered a "stamping defect," is transformed into a frequency-selective damping structure. For example, a 200Hz vibration corresponds to a kink period with a 150nm laminar spacing, significantly improving energy absorption compared to conventional uniform structures. This fills a gap in the understanding of layered structures as functional carriers.

[0017] Cross-scale stress-structure quantitative mapping: Utilizing spatiotemporal inhomogeneous stress fields and magneto-phonon coupling control, a quantitative relationship between dynamic stress parameters and lamellar spacing and orientation is established to resolve the chaotic problem of “stress-structure” mapping at high strain rates. The lamellar spacing control accuracy is improved from traditional technology to 0.001%, and the grain size difference is ≤1.2 levels (meeting the GB / T3077-2015 standard).

[0018] Multi-band damping coverage and synergistic strength: A nanotrap array composed of "pink-shaped" nanogrooves and Zr-based amorphous alloy layers improves energy absorption at 300Hz vibrations. A dual-gradient loading strategy distributes the interlamellar spacing according to the Fibonacci sequence (150nm→90nm→55nm→35nm), corresponding to damping peaks at 200Hz, 300Hz, 400Hz, and 500Hz, achieving multi-band damping coverage. A "strength buffer layer" is created in the main body through controlled fluctuations, ensuring a tensile strength of ≥1100MPa, resolving the strength-damping coupling contradiction inherent in traditional technologies.

[0019] Non-periodic fatigue-resistant structure design: Chaos control theory with ±5% amplitude disturbance is introduced to form non-periodic gradients in the layered structure, destroying the resonance conditions of the traditional periodic structure and prolonging the fatigue crack initiation time, while meeting the requirement of grain size difference ≤1.2.

[0020] Orientation-Controlled Anisotropic Damping: Through stress deviator-phonon energy matching and helical phase stress waves, the crystal orientation difference can be controlled from 30° to 120°, forming a zigzag interface path. For example, a 60° orientation difference increases the corresponding 350Hz vibration energy absorption rate by 72%, covering the main automotive vibration frequency range (200-500Hz), breaking the limitations of traditional isotropic materials.

[0021] Nano-twin toughening and multi-physics field collaboration: Pulse current induces the formation of nano-twins at grain boundaries, reducing the interface slip resistance. Combined with the neural network optimization of the three physical fields of stress, temperature, and magnetic field, the target frequency damping ratio is improved while maintaining the grain boundary strength, solving the problem of damping enhancement accompanied by grain boundary weakening.

[0022] Nano-macro cross-scale collaborative control: Construct a three-level dissipation channel of "stress wave-lamellar interface-nano-trap", and realize nanoscale closed-loop control of "monitoring-control-optimization" through AFM force sensor closed-loop control and recursive neural network optimization. The efficiency of process parameter optimization is significantly improved, avoiding the blindness of traditional trial and error methods.

[0023] By forming a complete three-level control system through nanostructure programming, energy dissipation structure manufacturing, and crystal orientation locking, we achieve the transition from "structure uniformity first" to "functional gradient design", and give the layered structure a frequency-selective damping function; establish a "stress-lamellar-orientation" three-dimensional model to achieve the collaborative design of "high-strength body + multi-frequency damping edge", breaking through the performance coupling bottleneck; introduce technologies such as phonon resonance and superconducting magnetic field to construct a quantitative correlation between nanoscale grain boundaries and macroscopic performance, and solve the problem of chaos control under high strain. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1This is a schematic diagram of the principle of the frame sleeve stamping dynamic stress-structure evolution coordinated control method of the present invention. DETAILED DESCRIPTION

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] See also Figure 1 , the present invention provides a technical solution: See Figure 1 As shown, an embodiment of the frame sleeve stamping dynamic stress-structure evolution coordinated control method: Step 1: Nanostructured tissue programming based on stress wave modal modulation: 1. Construction of spatiotemporal stress matrix: Synergistic Effect of Multi-Frequency Stress Waves: Automotive vibration frequencies primarily range from 20-500Hz, and the damping performance of layered structures is closely related to interlaminar spacing and orientation (interlaminar spacing varies by 20%-30% / MPa). By superimposing three-frequency stress waves (fundamental frequency, harmonics, and difference frequencies), we simulate the complex stress environment found in actual operating conditions, causing interlaminar spacing to dynamically respond to the stress frequency, forming a "damping functional unit" that matches the vibration frequency.

[0027] Standing wave field-induced interface kink: Inspired by the standing wave principle of quantum mechanics, anti-phase loading units are placed on the symmetric surfaces of the mold to create a stress standing wave field at the flange edge. The crests and troughs of the standing wave alternately act on the layer interface, inducing periodic kinks (5°-15° / cycle). This structure resonates and absorbs vibrations at specific frequencies, transforming the "stress gradient-induced layered structure," traditionally considered a defect, into a frequency-selective damping structure.

[0028] Inhomogeneous stress field in time and space: ; in: Represents spatial coordinates and time The changing dynamic stress distribution breaks through the traditional uniform stress assumption and achieves precise stress control at the nanoscale. Using a 2000+ micro-laser array controlled by a DMD, the non-uniform distribution of stress waves at the nanoscale is achieved, enabling precise coupling of the interlaminar spacing gradient and the stress amplitude gradient at the flange edge. This is difficult to achieve with traditional millimeter-scale uniform loading techniques (such as overall mold pressurization). is the stress gradient, which is controlled to be less than , avoiding the initiation of cracks caused by sudden stress changes, while ensuring that the interlaminar spacing changes regularly along the stress gradient direction.

[0029] It is necessary to add the following explanations here: By inducing kinking at the lamellar interface through standing wave fields, the team proposed a frequency-selective damping capability for layered tissues. For example, a 200Hz vibration corresponds to a kink period with a 150nm interlamellar spacing, resulting in improved energy absorption compared to traditional uniform tissues. This approach fills a gap in the understanding of layered tissues as functional carriers.

[0030] The time-space non-uniform stress field breaks the average stress assumption of continuum mechanics and establishes a quantitative mapping relationship between dynamic stress parameters (frequency / phase / spatial distribution) and interlamellar spacing and orientation (such as the quantized step of interlamellar spacing). , which solved the chaotic problem of "stress-structure" mapping under high strain rate.

[0031] 2. Magneto-phonon coupling control: Magnetostrictive effect and phonon resonance: The phonon vibration frequency of the ferrite (110) crystal plane is 18kHz. When the pulse magnetic field frequency resonates with it, the 1-2nm lattice distortion caused by magnetostriction will amplify the phonon energy, reduce the lamellar interface energy, and promote the formation of oriented lamellar structure.

[0032] High-frequency switching of superconducting magnetic fields: YBCO superconducting coils are used to achieve 100kHz magnetic field switching at a low temperature of 77K (conventional electromagnetic coils only have 10kHz), matching the high-frequency components of dynamic stress waves (20-40kHz), forming a "magnetic field-stress wave-phonon" cross-physical field coupling, and regulating grain boundary behavior at the quantum scale.

[0033] Quantized steps of layer spacing: ; in: is the initial layer spacing (e.g. ); is the number of pulses; is a quantized step under resonance conditions (conventional technology ), to achieve precise “step-by-step” control of the layer spacing.

[0034] It is necessary to add the following explanations here: Through magneto-phonon resonance, the interlamellar spacing can be controlled with an accuracy of Upgrade to , and the interface energy is significantly reduced, so that the layered structure in the edge area has a gradient damping function while maintaining a grain size difference of ≤1.2 (meeting the national standard), breaking through the thinking limitation of "organizational heterogeneity = performance defects" in traditional technology.

[0035] The lattice distortion induced by the magnetic field works together with phonon resonance to produce a "dynamic energy trap" at the layer interface, improving the energy dissipation efficiency of high-frequency vibrations above 300 Hz.

[0036] Stress loading system: A digital micromirror device (DMD) is used to split the laser beam into more than 2,000 microbeams. Each microbeam independently controls the stress wave parameters (amplitude, frequency, and phase), achieving "region-specific stress loading." For example, high-frequency pulses (20-40kHz) are applied to the flange edge to induce layer kinking, while low-frequency fundamental waves (5-10kHz) are applied to the main body to ensure strength.

[0037] Magnetic field generating device: The superconducting coil adopts a split design, with only a 5mm thick NbTi coil embedded in the mold at the flange edge area. The low temperature of 4.2K is maintained by liquid nitrogen circulation (traditional magnetic field equipment requires overall cooling), and a 15mT pulsed magnetic field (rise time 50ns) is achieved in the local area, which not only reduces energy consumption but also improves control accuracy, solving the problem of engineering application of superconducting technology.

[0038] It is also necessary to add that: This provides an organizational foundation for step two: the precisely controlled interlamellar spacing gradient (e.g., Fibonacci sequence distribution) is matched with the geometric resonance of the mold nano-traps (50nm grooves correspond to a lamella aspect ratio of 3:1), forming a three-level dissipation channel of "stress wave-lamellar interface-nano-trap", further improving the damping performance (see step two).

[0039] Provide an orientation basis for step three: the phonon resonance-induced layer interface twist provides the initial driving force for the crystal orientation rotation, and cooperates with the subsequent spiral phase stress wave (10° / μs angular velocity) to achieve ±3° orientation precision control and construct a spiral structure with anisotropic damping (see step three).

[0040] Step 2: Precision manufacturing of energy dissipation structure: 1. Nano-viewing trap array: Principle of geometric resonance matching: The aspect ratio of the ferrite / pearlite lamellae is about 3:1 (typical lamella size is 50-200nm). Through the geometric resonance of the "pin-shaped" nano-grooves (side length 50nm, depth 30nm) and the lamellae, the stress wave resonates with the lamella interface during propagation, inducing interface micro-slip to dissipate energy.

[0041] Amorphous interface energy barrier: The difference between the Zr-based amorphous alloy layer (atomic coordination number 11.8) and the crystalline ferrite (12) forms an energy barrier of 0.2-0.3 eV, which selectively captures stress waves of specific wavelengths (such as 200 Hz vibration corresponding to the stress wave wavelength of a 150 nm layer), and converts the quantum tunneling effect of the nanoscale grain boundary into an improvement in macroscopic damping performance.

[0042] Energy barrier: ; in: is the Boltzmann constant; is the absolute temperature; 、 are the coordination numbers of amorphous and crystalline atoms, respectively. The energy barrier increases with the increase of the coordination number difference, which effectively hinders the propagation of stress waves and promotes energy dissipation.

[0043] It is necessary to add the following explanations here: The geometric resonance matching of nano-grooves and laminae establishes a quantitative relationship between the submicron laminar spacing (50-200nm) and the mold microstructure, filling the gap in the dynamic stress parameter and laminar tissue scale mapping model; the amorphous interface reduces the interface slip resistance, avoiding strength loss while increasing damping, and resolving the "strength-damping" coupling contradiction.

[0044] The energy absorption rate of 300Hz vibration can be improved, and the Fibonacci sequence distribution of the layer spacing along the radial direction (150nm→90nm→55nm→35nm) corresponds to the damping peaks of 200Hz, 300Hz, 400Hz, and 500Hz, achieving "multi-band damping coverage".

[0045] A focused ion beam (FIB) combined with a scanning tunneling microscope (STM) for in-situ observation ensures that the groove size error is ≤±1nm and the interface roughness between the amorphous layer and the crystalline substrate is <0.5nm, achieving atomic-level matching between the nanostructure and the layered organization, breaking through the micron-level precision limitations of traditional mold processing.

[0046] 2. Gradient layered tissue growth control: Dual-gradient loading strategy: The main area adopts "low-frequency stress base + high-frequency correction pulse" (base frequency 8kHz, correction pulse 30kHz), and constructs a "strength buffer layer" through controllable fluctuations (±5nm) to ensure tensile strength ≥1100MPa; the edge area implements dual-gradient loading of stress amplitude (600-1200MPa) and frequency (10-25kHz), combined with mold nano-trap induction, so that the inter-layer spacing is distributed according to the Fibonacci sequence, corresponding to different damping peak frequencies.

[0047] Chaos control to prevent fatigue: Chaos control theory with ±5% amplitude disturbance is introduced to form non-periodic gradients in the layered structure, destroying the resonance conditions of the traditional periodic structure and prolonging the fatigue crack initiation time.

[0048] Fibonacci layer spacing sequence: ; in: Initial value , followed by , corresponding to the damping peak frequency: ; Self-similar distribution of frequency responses is achieved through geometric similarity.

[0049] It is necessary to add the following explanations here: The combination of dual-gradient loading and chaos control not only meets the national standard requirement of grain size difference ≤1.2, but also realizes multi-frequency damping peaks in the edge area, breaking through the limitation of "functional design relying on single performance sacrifice" in traditional technology.

[0050] The non-periodic gradient structure makes the sleeve's vibration response under complex road conditions present a "broadband attenuation characteristic", improves the energy dissipation efficiency of random vibration, and has a lower strength degradation rate under high-frequency vibration (>400Hz), achieving the performance unity of "high damping in the entire frequency band + high reliability".

[0051] Nanogrooves are processed using 50fs ultrashort pulse lasers with a single pulse energy of 50nJ, avoiding the heat-affected zone of traditional laser processing and ensuring the atomic-level purity of the amorphous transition layer.

[0052] It is also necessary to explain here that: Mold surface treatment: Nano-grooves are arranged in a "staggered arrangement" rather than a traditional periodic array. Adjacent grooves have a phase difference of 15°, which causes stress waves to scatter and overlap during propagation, forming a disordered energy dissipation path and further suppressing the resonance effect. The amorphous layer is prepared by pulsed laser deposition (PLD) technology, and the target material is Zr 48 Cu 36 Ag8Al8 alloy, whose atomic short-range ordered structure (coordination number 11.8) formed by rapid cooling from liquid state forms the best energy barrier match with crystalline ferrite.

[0053] Process parameter optimization: Mold temperature gradient control (200°C in the main area, 300°C in the edge area) combined with 30kHz ultrasonic vibration (amplitude 3μm) uses thermal stress to enhance the interfacial mobility of the layers, thereby increasing the speed of controlling the interlayer spacing. At the same time, the cavitation effect of ultrasonic vibration promotes atomic diffusion between the amorphous layer and the crystalline matrix, thereby improving the interface bonding strength.

[0054] at the same time: Providing a dissipation basis for step three: The precisely controlled interlamellar spacing gradient and the resonant coupling of the nano-traps provide a "guiding path" for energy dissipation of the crystal orientation rotation, further enhancing the damping effect of the spiral orientation distribution (step three).

[0055] Cross-scale synergistic effect: The energy barrier of the nanoscopic trap and the mesoscopic layer gradient work together to reduce the stress deviator threshold required for step three, thereby increasing the crystal orientation rotation rate while reducing energy loss.

[0056] Step 3: Dynamic locking of crystal orientation and activation of damped modes: Phonon spectrum matching orientation control: 1. Stress deviator-phonon energy matching: When the stress deviator is: ; in: Ferrite <110> Crystalline phonon energy; is the Burgers vector; The efficiency of grain boundary phonon scattering is maximized, and the grain rotation rate is significantly improved, which improves the orientation control from "empirical adjustment" to "physical law drive".

[0057] Spiral phase stress wave: The stress principal axis rotates at an angular velocity of 10° / μs, combined with 25kHz ultrasonic vibration (amplitude 2nm), causing the crystal to form a spiral orientation distribution during rotation (total rotation angle 120°). This structure produces anisotropic damping for vibrations between 200-500Hz, significantly improving the energy absorption rate at specific frequencies. This improvement in energy absorption rate at specific frequencies is based on the resonant matching effect between the crystal orientation and the stress wave frequency, which can be quantified using the following mathematical model: Specific frequency calculation formula: When the crystal orientation difference induced by the spiral phase stress wave is When , the frequency corresponding to the peak value of energy absorption rate is: ; in: : Stress wave propagation velocity (about 5800m / s in ferrite); : Layer spacing (such as the Fibonacci sequence value in step 2); : Shear modulus (about 80 GPa for ferrite); : density (7.87g / cm³); : Orientation misalignment angle (controllable range in this method is 30°-120°).

[0058] Specific frequency points and improvements: By adjusting the parameters of the spiral phase stress wave (angular velocity 10° / μs, ultrasonic amplitude 2nm), the following specific frequencies can be enhanced by damping: In practical applications, by controlling the total rotation angle to 120°, multiple damping peaks can be formed in the range of 200-500Hz, covering the main vibration frequency bands of the car.

[0059] Here are some additional explanations: Frequency selectivity mechanism: When the stress wave frequency matches the natural vibration frequency of the "zigzag" interface formed by the crystal orientation difference, resonance absorption occurs; orientation difference =60°, the interface tortuosity is the largest, and the absorption rate at 350Hz (the second-order vibration frequency of a car engine) is most significantly improved.

[0060] Ultrasonic synergistic effect: 25kHz ultrasonic vibration reduces the activation energy of grain boundary migration through the acoustic plastic effect, significantly increasing the orientation rotation rate; the ultrasonic amplitude of 2nm corresponds to an additional stress of approximately 0.5MPa at the grain boundary, forming a synergistic torque with the spiral stress wave.

[0061] This frequency-selective damping effect breaks through the limitations of traditional isotropic materials, enabling the frame sleeve to adaptively optimize damping performance for different working conditions (such as idling, acceleration, and bumpy roads).

[0062] Grain rotation rate: ; in: is the material constant (about 5×10 4 ° / (μs・MPa)), when the stress deviator meets the matching conditions, Significantly improved to achieve fast and accurate orientation control.

[0063] The phonon spectrum matching model breaks the average stress assumption of continuum mechanics and considers 10 -9 The non-equilibrium interaction of grain boundary atoms on the s time scale solves the chaos of the "stress-structure" mapping at high strain rates; the ±3° orientation accuracy (traditional ±15°) makes the orientation difference of the layered structure controllable, forming a "zigzag" interface path with efficient energy dissipation.

[0064] The spiral orientation distribution has a damping ratio of 0.20 for 300Hz vibration, which is significantly improved compared with the traditional linear interface. The layered structure with controllable orientation enables the sleeve to have the ability of "vibration condition adaptation". For example, it can enhance the 300-400Hz damping for the high-frequency bumps of off-road vehicles, filling the gap in performance regulation under dynamic loads.

[0065] AFM force sensor closed-loop control: integrated resolution 10 -12 The AFM force sensor with a maximum N·m capacity monitors the rotational torque of individual grains in real time and dynamically adjusts the ultrasonic vibration frequency (with an accuracy of ±0.1kHz) through a feedback algorithm, achieving nanoscale closed-loop control of "monitoring-control-optimization."

[0066] 2. Damping mode activation mechanism: Nanotwin toughening mechanism: Pulse current (peak 10A, pulse width 5μs) induces local melting of grain boundaries (1-2nm), and cooling generates nanotwin structure, which reduces the interface slip resistance by 20% and significantly enhances nanoscale energy dissipation; when the orientation difference reaches 60°, the tortuosity of the "zigzag" interface path increases significantly, and the scattering effect on high-frequency vibrations is significantly improved.

[0067] Three-parameter collaborative modulation: Combining the three physical fields of stress (amplitude / frequency), temperature (local Joule heating), and magnetic field (static bias field), the parameters are dynamically optimized through a neural network algorithm to improve the damping ratio at the target frequency, breaking through the performance limit of single-factor regulation.

[0068] Interface slip resistance: ; in: is the original resistance; is the drag reduction caused by nanotwinning; The twin crystal volume fraction (about 15%-20%) can be precisely adjusted by controlling the pulse current parameters .

[0069] Nano twins and the "zigzag" interface work together to improve damping while maintaining grain boundary strength, solving the problem of damping enhancement accompanied by grain boundary weakening in traditional technologies; three-parameter collaborative modulation realizes multi-objective optimization of "strength-damping-orientation", which improves the reliability of the sleeve under complex working conditions.

[0070] The dynamically activated damping mode enables the sleeve to have the ability of "vibration frequency recognition", which improves the energy dissipation efficiency of sudden high-frequency impacts (such as above 500Hz), which is significantly improved compared with traditional organizations. Moreover, this effect is only achieved under the combination of specific orientation difference (such as 60°) and layer spacing (such as 55nm).

[0071] Neural network dynamic optimization: A recursive neural network with more than 100 neurons is established. Input parameters include stress wave frequency, mold temperature, magnetic field strength, etc. The output is the optimal combination of interlamellar spacing, orientation difference and damping ratio. The training data comes from nanoscale molecular dynamics simulation (10 6 Atomic-level model) significantly improves the efficiency of process parameter optimization and avoids the blindness of traditional trial-and-error methods.

[0072] It is necessary to add the following explanations here: Ultrasonic vibration synergy: Ultrasonic vibration adopts a longitudinal-transverse composite mode (longitudinal amplitude 2nm, transverse amplitude 1nm). Longitudinal vibration promotes grain rotation, and transverse vibration suppresses abnormal grain growth, thereby improving the uniformity of orientation distribution. The vibration frequency and stress wave frequency maintain an integer ratio of 1:2 (such as stress wave 25kHz, ultrasonic vibration 12.5kHz), forming a stable resonance enhancement effect.

[0073] Precise control of pulse current: Nanosecond pulse power supply (rise time <10ns) is used to ensure that the local melting zone is limited to the grain boundary (size 1-2nm), avoiding affecting the intracrystalline structure; the current waveform adopts sine half-wave modulation, the peak current of 10A corresponds to a grain boundary temperature of 800℃ (lower than the melting point of the material 1538℃), and the cooling rate is >10 9 ℃ / s, ensuring the directional growth of nanotwins.

[0074] Cross-step coupling enhancement: The nanoscopic trap in step two provides an "energy dissipation guiding channel" for the crystal orientation in step three, so that the energy is concentrated on the target interface (such as the specific grain boundary of the Fibonacci layer) during the orientation rotation, thereby improving the damping mode activation efficiency; the three-frequency stress wave in step one provides a frequency-rich stress environment for the phonon spectrum matching in step three, ensuring that the phonon energy of different crystal orientations is effectively excited.

[0075] Summarize: The second step is to solve the "functional design fault" through geometric resonance and amorphous interface, and realize multi-frequency damping and strength synergy; the third step is to break through the "cross-scale control gap" through phonon matching and orientation control, and establish a quantitative correlation between nanoscale grain boundaries and macroscopic performance.

[0076] Step 2: Realize "frequency-selective multi-peak damping" and "non-periodic fatigue-resistant organization"; Step three realizes “crystal-direction controllable anisotropic damping” and “nonlinear dissipation of nanotwin toughening”.

[0077] Steps 2 and 3 form a complete three-level control system with step 1, from nanoscopic stress coding to mesoscopic structure construction and then to macroscopic function realization: By coupling the laminar spacing gradient with the vibration frequency, a "frequency selective damping structure" is constructed to give the laminar tissue a damping function; Establish a three-dimensional "stress-lamina-orientation" model and achieve a coordinated design of "high-strength body + multi-frequency damping edge" through dual-gradient loading, breaking through the performance coupling bottleneck; By introducing technologies such as phonon resonance and superconducting magnetic fields, we can establish a quantitative correlation between nanoscale grain boundaries and macroscopic properties and solve the problem of chaos control under high strain.

Claims

1. A collaborative control method for dynamic stress and structural evolution of frame sleeve stamping, characterized by: The following steps are involved: Nanostructured programming based on stress wave modal modulation: constructing a spatiotemporal modulated stress matrix, inducing interface kinks through the superposition of multi-frequency stress waves and standing wave fields, making the interlaminar spacing respond dynamically to the stress frequency; Utilizing magneto-phonon coupling control: Through the magnetostrictive effect and high-frequency switching of the superconducting magnetic field, it is used for quantized control of the interlamellar spacing; Precision manufacturing of energy dissipation structures: Constructing nanoscale trap arrays and implementing gradient layered tissue growth control to form damping functional units that match the vibration frequency; Dynamic locking of crystal orientation and damping mode activation: Through phonon spectrum matching orientation control and damping mode activation mechanism, helical tissue with anisotropic damping is constructed.

2. The frame sleeve stamping dynamic stress-structure evolution coordinated control method according to claim 1, characterized in that: The construction of spatiotemporal constraint stress matrix is ​​as follows: The three-frequency stress wave superposition is used to simulate the actual working stress environment. The anti-phase loading units are set on the symmetric surface of the mold to form a stress standing wave field. The micro-laser array controlled by DMD realizes nanoscale non-uniform stress distribution, and the stress gradient is controlled to less than 10MPa / μm.

3. The frame sleeve stamping dynamic stress-structure evolution coordinated control method according to claim 1, characterized in that: In the magneto-phonon coupling control, the pulsed magnetic field frequency resonates with the ferrite (110) crystal plane phonon vibration frequency of 18kHz. The 100kHz magnetic field is switched at a low temperature of 77K using a yttrium barium copper oxide superconducting coil. The interlamellar spacing control satisfies the quantized step formula: ； in: is the initial layer spacing; is the number of pulses; is the quantized step under resonance conditions.

4. The frame sleeve stamping dynamic stress-structure evolution coordinated control method according to claim 1, characterized in that: In the construction of the nanotrap array, a herringbone-shaped nano-groove is used to match the geometric resonance of the layer. The groove has a side length of 50nm and a depth of 30nm. Combined with the Zr-based amorphous alloy layer, it forms a 0.2-0.3eV energy barrier. The energy barrier satisfies the formula: ； in: is the Boltzmann constant; is the absolute temperature; 、 are the coordination numbers of amorphous and crystalline atoms, respectively.

5. The frame sleeve stamping dynamic stress-structure evolution coordinated control method according to claim 1, characterized in that: Gradient layered tissue growth control uses a dual gradient loading strategy: A stress wave with a fundamental frequency of 8 kHz and a modified pulse of 30 kHz was applied to the main area, and a double gradient loading with a stress amplitude of 600-1200 MPa and a frequency of 10-25 kHz was applied to the edge area. The interlaminar spacing was distributed according to the Fibonacci sequence, satisfying the following: ； Initial value .

6. The frame sleeve stamping dynamic stress-structure evolution coordinated control method according to claim 1, characterized in that: In the phonon spectrum matching orientation control, the stress deviator satisfies: ； in: Ferrite <110> Crystalline phonon energy; is the Burgers vector; Using spiral phase stress wave, the stress principal axis rotates at an angular velocity of 10° / μs, combined with 25kHz ultrasonic vibration, the crystal orientation difference and peak frequency satisfy the formula: ； in: : stress wave propagation velocity; : interlamellar spacing; : shear modulus; :density; : misorientation angle.

7. The frame sleeve stamping dynamic stress-structure evolution coordinated control method according to claim 1, characterized in that: In the damping mode activation mechanism, a pulse current is used to induce the formation of nanotwins at the grain boundary to reduce the interface slip resistance. Combined with the neural network optimization of the three physical fields of stress, temperature, and magnetic field, the damping ratio at the target frequency is improved. The interface slip resistance satisfies the formula: ； in: is the original resistance; is the drag reduction caused by nanotwinning; is the twin crystal volume fraction.

8. The frame sleeve stamping dynamic stress-structure evolution coordinated control method according to claim 1, characterized in that: An AFM force sensor is used to close the loop to control the grain rotation torque. A recursive neural network is used to optimize the stress wave frequency, mold temperature, and magnetic field strength. The optimal combination of interlamellar spacing, orientation difference, and damping ratio is input. The training data comes from nanoscale molecular dynamics simulations.

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