Abrasion inhibition method for micro-curvature stamping die of guide edge of flower type floating valve

Abstract

The invention discloses a pattern float valve guide edge micro-curvature stamping die wear inhibition method, and relates to the technical field of stamping die manufacturing, and the method comprises the following steps: constructing a controllable wear profile based on a crystal orientation gradient, and controlling the tip of an edge to be lt through directional solidification; 111gt, 111gt; a crystal face, the base of which is lt; 001gt, 001gt; a crystal face forms a differential wear rate; according to the method, controllable abrasion of the edges and active compensation of forming deviation are achieved through crystal orientation gradient design, a traditional coating is replaced with matrix orientation abrasion, and the problems of poor coating uniformity and peeling off are solved; contact stress is dissipated by means of the nano twin crystal layer, a low-stress abrasion cycle is formed, and the material utilization rate is increased; programmable regulation and control of a wear profile are realized through an inverse parabola model, and the precision bottleneck of a traditional model is broken through; the surface energy gradient is used for driving the lubricating liquid to directionally migrate, and a high-speed stamping lubricating blind area is eliminated; the integrated piezoelectric-SMA composite support compensates abrasion deformation in real time, and the material guiding deviation is eliminated in combination with an intelligent model switching strategy.

Description

Technical Field

[0001] The invention relates to the technical field of stamping die manufacturing, in particular to a method for suppressing wear of a stamping die with a micro-curvature of a flower-shaped float valve guide edge. Background Art

[0002] In the field of flower-shaped float valve manufacturing, wear control of stamping dies with micro-curvature guide edges has long been a technical difficulty. As the core guide structure of the die, the surface condition of the micro-curvature edge directly affects the molding accuracy of the flower-shaped float valve. Traditional technology has long focused on wear suppression, forming a technical path with wear reduction as the core goal. This goal is achieved mainly through material strengthening, lubrication optimization, and structural improvements. Specifically, the following are some of the methods: Enhanced material properties: Use high-hardness substrates or improve edge wear resistance through surface treatment technology; Optimize lubrication conditions: Design oil storage structures, use special lubricating additives or air film lubrication technology to reduce contact interface friction; Improved structural design: perform transition treatment on edges, use removable wear-resistant inserts or add surface hardening layer to delay the wear process.

[0003] Although the above method has achieved certain results in conventional stamping scenarios, the following problems still exist for the special working conditions of the guide edge of the flower-shaped float valve: During the high-frequency stamping process of micro-curvature edges, due to the concentrated contact stress and extremely small curvature radius, the following results are caused: The thickness uniformity of traditional coatings on complex curved surfaces is difficult to control, the bonding strength between the coating and the substrate decreases, and edge peeling is prone to occur; The flow resistance of the lubricating medium in the micron-level gap increases, the frequency of lubricating film rupture increases during high-speed stamping, and a lubrication blind area forms at the edge tip, causing the wear rate to be significantly faster than that in the conventional area. Existing technologies only focus on controlling the amount of wear, but fail to realize that the curvature change caused by edge wear will cause deviations in the material guide angle, directly leading to molding defects such as imbalanced symmetry of the petals of the flower-shaped float valve and excessive edge roughness. The regular effects of changes in geometric parameters during the wear process are ignored. For example, when the curvature of the edge decreases due to wear, traditional technologies only solve the problem by repairing or replacing the mold, but fail to find a quantifiable functional relationship between the curvature change and the material flow resistance. If the curvature state of the edge after wear can be preset, the new contour formed will just compensate for the molding deviation caused by fluctuations in the thickness of the blank and elastic deformation of the mold during the stamping process, thereby achieving a positive transformation of the wear effect.

[0004] In view of this, a method for suppressing wear of a stamping die with a micro-curvature of a flower-shaped float valve guide edge is provided to overcome the above-mentioned problem. Summary of the Invention

[0005] The object of the present invention is to provide a method for suppressing wear of a stamping die with a micro-curvature of a flower-shaped float valve guide edge, so as to solve the problems raised in the above-mentioned background technology.

[0006] To solve the above technical problems, the present invention provides a method for suppressing wear of a stamping die with a micro-curvature of a flower-shaped float valve guide edge, comprising the following steps: Based on the crystal orientation gradient, a controllable wear profile is constructed, and the edge tip is controlled by directional solidification. <111> Crystal face, base <001> Crystal planes, forming differentiated wear rates; Nano-twin layers were prepared for interface engineering, and a twin boundary density of 1.2×10 10 / cm² nanotwin network; Geometry-wear coupling: Establish the inverse parabolic preform wear evolution equation considering the contact stress distribution; Construct a nanoscale lubrication system driven by surface energy gradient, and control the directional migration of lubricating fluid through micro-nano composite structure and gradient surface energy; The self-powered dynamic compensation mechanism with integrated piezoelectric-SMA composite support adjusts the edge shape in real time to compensate for wear.

[0007] Furthermore, during directional solidification control, the angle between the crystal plane normal and the wear direction is controlled at 75°±2° through dynamic modulation of the temperature gradient and magnetic field-assisted in-situ monitoring.

[0008] Furthermore, the nano-twin layer was prepared by pulsed magnetic field assisted laser cladding, and a 50 kHz alternating magnetic field was introduced to make the twin boundaries precipitate uniformly at 0.1 μm intervals.

[0009] Furthermore, the wear evolution equation of the inverse parabolic preform is: ; in: : Time rate of change of curvature radius; : material wear coefficient; : position-time dependent contact stress; : elastic modulus of material; : Correction index based on the Stribeck curve; : The angle between the crystal plane normal and the wear direction.

[0010] Furthermore, the micro-nano composite structure is constructed by dual-beam laser interference processing of micron pits and plasma deposition of nano-columnar protrusions.

[0011] Furthermore, the surface energy gradient was achieved by molecular self-assembly gradient coating of perfluorooctyltrichlorosilane solution, so that the surface energy gradually transitioned from 30 mN / m at the tip to 50 mN / m at the base.

[0012] Furthermore, the piezoelectric-SMA composite support integrates PZT-5H piezoelectric sheets and Ni-TiSMA wires through low-temperature co-fired ceramics, and the SMA wires are arranged in a serpentine shape with a spacing of 0.5 mm.

[0013] Furthermore, in the control logic of the dynamic compensation mechanism, the stress-charge density matrix is ​​used: ; in: is the charge of each piezoelectric piece, The weight coefficients of the three sensitive areas are determined by finite element modal analysis.

[0014] Compared with the prior art, the present invention has the following beneficial effects: Achieve controllable evolution of the wear profile: Through crystal orientation gradient design, different areas of the edge wear differentially at preset rates, forming precise curvature changes that conform to the mathematical model, and actively compensate for forming deviations caused by billet thickness fluctuations and mold elastic deformation.

[0015] Abandon the reliance on rigid coatings: Replace the traditional coating anti-wear through the directional wear of the base material itself, solve the problems of poor coating uniformity and low bonding strength on complex curved surfaces, and avoid peeling of the coating edges.

[0016] Dissipating contact stress: Through the dynamic slip of the twin boundaries of the nano-twin layer, the contact stress is converted into interface slip energy, avoiding the peeling of traditional coatings caused by stress concentration and achieving a virtuous cycle of "low stress-low wear".

[0017] Improve material utilization: No need to frequently replace molds, and directional wear reduces ineffective wear, reducing material consumption and processing costs.

[0018] Precisely control wear evolution: By preforming the inverse parabola wear evolution equation, a multi-parameter coupling model is constructed to achieve "programmability" of the wear profile, breaking through the accuracy bottleneck of the traditional linear wear model.

[0019] Eliminate lubrication blind spots: Drive the directional migration of lubricating fluid through surface energy gradient, combine the precise coupling of micro-nano composite structure and lubricating fluid release to ensure the stability of the lubricating film thickness at the tip, and solve the problem of lubricating film rupture under high-speed stamping.

[0020] Real-time dynamic compensation for wear: Through the self-powered mechanism of the piezoelectric-SMA composite support, the edge shape is adjusted in real time to compensate for the curvature change caused by wear. Combined with the hidden Markov model to switch the compensation strategy, the deviation of the material guide angle is eliminated. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the wear suppression method for the stamping die with micro-curvature of the guide edge of the flower-shaped float valve according to the present invention. DETAILED DESCRIPTION

[0022] 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.

[0023] See also Figure 1 , the present invention provides a technical solution: See Figure 1 As shown, an embodiment of the method for suppressing wear of a stamping die with a micro-curvature of a flower-shaped float valve guide edge is as follows: 1. Construction of controllable wear profile based on crystal orientation gradient: 1. Material microstructure reconstruction: 1.1. Directional solidification gradient control: Traditional material strengthening technologies (such as surface hardening and coatings) are essentially designed to combat wear. However, the "contact stress concentration and dynamic curvature changes" of micro-curved edges inevitably lead to the failure of rigid coatings (because the coating cannot adaptively deform with the wear profile). This method leverages the material's inherent anisotropic wear properties to transform uncontrollable random wear into directional wear along a pre-defined path, making the wear process an "actively designed geometric evolution process."

[0024] The purpose is to: Controlled evolution of wear profiles: Designing with crystal orientation gradients (cutting-edge <111> Crystal face, base <001> crystal surface), so that different areas of the edge wear differently at a preset rate (3:1 difference), forming a mathematical model The curvature deviation is ≤0.001mm, and it actively compensates for the forming deviation caused by the thickness fluctuation of the blank (±0.05mm) and the elastic deformation of the mold.

[0025] Completely abandon the reliance on rigid coatings: replace traditional coating anti-wear through the directional wear of the base material itself to solve the problems of poor coating uniformity and low bonding strength on complex curved surfaces.

[0026] It is necessary to add the following explanations here: : The real-time curvature radius related to position and time. Indicates the curvature radius at any position along the length of the edge. Place, experience The instantaneous radius of curvature after the first punch is in millimeters. This parameter is the core dynamic variable throughout the service life of the mold, directly reflecting the geometric changes after the edge wear. Its evolution law is precisely controlled by the anisotropic wear characteristics of the material and the geometric pre-design. The mathematical model converts the uncontrollable random wear into the pre-set directional wear, so that The dynamic changes just compensate for the thickness fluctuation of the blank (±0.05mm) and the elastic deformation of the mold, solving molding defects such as imbalance of petal symmetry.

[0027] : Initial curvature radius distribution function. The edge is in the initial state (no wear occurs, ). Using the inverse parabola preforming design, the specific expression is: ; in: The initial curvature radius of the edge tip is designed for micro-curvature working conditions, balancing the initial guiding accuracy and wear compensation margin; As the profile shape control parameter, the curvature radius is nonlinearly distributed along the edge length (from tip to base) through an exponential decay function, providing an initial geometric basis for subsequent directional wear.

[0028] Design basis: Combined with crystal orientation gradient (cutting edge <111> Crystal face, base <001> The differentiated wear rate of the crystal surface allows the initial profile to evolve along a preset path during the wear process, avoiding the irregular change of curvature caused by wear in traditional technologies.

[0029] : Cumulative stamping times. Indicates the cumulative number of times the mold has been put into use, in times. The formula is applicable to the expected service life of the mold and is the core time parameter for quantifying the degree of wear. Through molecular dynamics simulation and wear experiment fitting, the The precise correspondence with the attenuation of the curvature radius makes the curvature change caused by each stamping predictable and controllable, breaking through the bottleneck of "unquantifiable wear amount" in traditional technology.

[0030] : Time-related wear rate coefficient. The decay rate coefficient of the unit punching times to the curvature radius, the dimension is times -1, which means that each punching causes the curvature radius to decay by 0.1% (for example, after 1000 punchings, the curvature radius decays to 90% of the initial value). <111> The crystal surface wear rate is <001> The contact stress distribution (peak value 5GPa) and lubrication conditions (shear thickening effect of nanoscale lubrication wedge) were obtained through multi-physics field coupling simulation and experimental data fitting, reflecting the synergistic effect of "crystal orientation-stress-lubrication".

[0031] : Wear evolution index. A dimensionless index that describes the nonlinear attenuation law of the curvature radius with the number of punching times (in the form of a power function). Different from the traditional linear wear model (such as ), which is determined by Stribeck curve correction and finite element wear simulation, and reflects the inhibitory effect of shear thickening effect on wear rate under high-speed stamping. The attenuation trend is closer to the actual working conditions, avoiding the prediction error of the traditional linear model under high-frequency stamping.

[0032] This formula constructs a quantitative relationship between "geometry-wear rate-forming accuracy" through "initial profile pre-design + material anisotropy control + multi-physical field coupling", realizing the "programmability" of the wear profile.

[0033] The higher the material hardness, the better the wear resistance (such as using cemented carbide or surface carburizing). This method achieves differentiated wear rate by controlling the crystal orientation (rather than increasing the hardness) - the tip area is selected with a faster wear rate. <111> Crystal plane (using the anisotropy of face-centered cubic crystal, the wear rate is <001> Several times the size of the crystal face), the base is made of wear-resistant <001> crystal planes, forming a controllable wear gradient along the length of the edge.

[0034] Through dynamic modulation of the temperature gradient (10°C / s heating rate) and magnetic field-assisted in-situ monitoring (0-5T real-time adjustment, X-ray diffraction accuracy of 0.01°), nanoscale control of the crystal growth direction is achieved (the angle between the crystal plane normal and the wear direction is controlled at 75°±2°).

[0035] 1.2. Nano-twin layer interface engineering: Core considerations: Peak contact stress at micro-curved edges reaches 5 GPa. Traditional coatings (such as TiN and CrN) often peel off due to stress concentration. This method dissipates contact stress through dynamic slip at twin boundaries, converting stress energy into interfacial slip energy rather than relying on coating hardness to resist stress. This fundamentally resolves the "stress-coating failure" conflict.

[0036] Stress dissipation mechanism: Traditional coatings rely on the "hardness-stress bearing" relationship, but twin boundaries have a dislocation pileup effect (dislocations accumulate and slip at the twin boundaries), which disperses contact stress along the zigzag twin network. This shifts stress control from "external coating bearing" to "energy dissipation within the substrate."

[0037] Pulsed magnetic field assisted preparation: A 50kHz alternating magnetic field is introduced during laser cladding to promote the uniform precipitation of twin boundaries with a spacing of 0.1μm (the density of twin boundaries reaches 1.2×10 10 / cm²), forming a nanoscale twin network. While traditional laser cladding only controls the melt pool temperature, this method uses a magnetic field to manipulate the distribution of crystal defects, enabling targeted design of nanoscale interface structures (e.g., precise control of twin boundary density and distribution morphology).

[0038] It is necessary to add the following explanations here: Forming defects caused by curvature changes: By presetting the crystal orientation gradient, the edge wear strictly follows the mathematical model , curvature deviation ≤ 0.001mm, directly compensates for the thickness fluctuation of the blank (± 0.05mm) and the elastic deformation of the mold, and solves the imbalance of petal symmetry.

[0039] Traditional coating edge peeling: Abandoning rigid coatings and replacing coating failure with controlled wear of the substrate material itself.

[0040] and: Programmability of wear profiles: The positive coupling of curvature changes after wear and forming accuracy makes wear a "programmable geometric compensation process" rather than an uncontrollable source of defects. For example, when the curvature of an edge decreases due to wear, its new profile precisely compensates for forming deviations caused by fluctuations in blank thickness during the stamping process, achieving "wear-as-compensation."

[0041] Improved material utilization: There is no need to frequently replace molds (life expectancy is increased), and the amount of material removed after wear is less than that of traditional technologies (directional wear reduces ineffective wear), reducing material consumption and processing costs.

[0042] Nano-twin layer interface engineering: Coating failure caused by contact stress concentration: Dislocation pile-up at the twin boundaries increases the stress decay rate, preventing edge peeling of the coating due to stress concentration.

[0043] Coating uniformity problem on complex curved surfaces: There is no need to prepare uniform coating on complex curved surfaces. Instead, uniform stress distribution can be achieved through microstructural optimization of the base material, fundamentally bypassing the coating thickness control problem.

[0044] Stress-wear decoupling effect: The contact stress is converted into interfacial slip energy, which reduces the wear rate of the edge surface and maintains uniform stress distribution during the wear process, thus achieving a virtuous cycle of "low stress-low wear".

[0045] Self-healing potential: Dynamic slip at twin boundaries can partially restore the surface morphology of the material (such as filling pits through dislocation movement after slight wear). This is an adaptability that traditional rigid materials cannot achieve, providing a guarantee for the long-term stable operation of the mold.

[0046] Here are some additional explanations: Providing bottom support for the lubrication system, the controllable wear profile formed by directional solidification (such as reverse parabolic preforming) makes the distribution of micro-nano structures (such as micron pits) on the edge surface more uniform. Combined with the gradient surface energy coating, it ensures that the lubricating fluid always migrates along the preset path during the wear process, solving the problem of structural failure of traditional lubrication after wear (such as the formation of lubrication blind spots).

[0047] The nano-twin layer reduces contact stress and the frequency of lubricating film rupture, creating conditions for the stable formation of nano-scale lubricating wedges driven by surface energy, causing a shear thickening effect under high-speed shear, thereby improving the load-bearing capacity of the lubricating film.

[0048] Synergistic effect with dynamic compensation mechanism: The wear rate controlled by the crystal orientation gradient (fast at the tip and slow at the base) is precisely matched with the deformation of the piezoelectric-SMA composite support (0.5μm displacement accuracy), enabling the compensation mechanism to dynamically adjust the edge shape according to the preset wear profile (for example, when the tip curvature radius decreases by 0.01mm, the SMA wire automatically compensates for 0.3% strain), realizing real-time coupling of "wear profile-compensated deformation".

[0049] Stress dissipation at the twin boundaries reduces elastic deformation errors in the mold, improves the control accuracy of the closed-loop self-calibration system, and ensures that material guide angle deviations can be accurately compensated even under high-frequency stamping.

[0050] 2. Geometry-wear coupling design: Mathematical modeling of inverse parabola preforming: Establish the wear evolution equation considering the contact stress distribution: ; in: : The time rate of change of the radius of curvature. Indicates the edge at position The curvature radius R at the The instantaneous rate of change of the wear radius is the core dynamic variable describing the wear process. A negative value indicates that the curvature radius decreases with wear.

[0051] : Material wear coefficient. A proportionality constant that characterizes the inherent wear characteristics of a material.

[0052] : Position-time dependent contact stress. The edge at position Place, experience Contact stress after the first punching.

[0053] : Elastic modulus of a material. Characterizes the material's ability to resist elastic deformation.

[0054] : Correction exponent based on the Stribeck curve. This dimensionless correction exponent, set to 1.5, describes the nonlinear effect of lubrication on wear rate. It is derived based on the Stribeck curve (the relationship between lubricant film thickness and friction coefficient).

[0055] : The angle between the crystal plane normal and the wear direction. The angle between the crystal plane normal and the wear direction is controlled at 75°±2° in the tip area and 75°±2° in the base area. <001> The crystal plane is close to 0°.

[0056] This equation constructs a wear dynamics model of "contact stress-material properties-crystal orientation-lubrication state" through multi-parameter coupling, with the following purposes: Cross-scale modeling: from atomic-level crystal plane orientation To macroscopic stress distribution , integrating molecular dynamics simulation and experimental data to achieve precise control at the differential equation level. Traditional technology only relies on empirical formulas and has low accuracy; Nonlinear correction: by =1.5 captures the shear thickening effect under high-speed stamping, breaks through the linear assumption of classical wear theory, and controls the prediction error of the model under high-speed working conditions; Directional wear design: Pass and The coordinated regulation of random wear is converted into directional wear of "fast tip and slow base", which improves the efficiency of compensation for curvature change and billet fluctuation, and realizes the reverse design of "wear is compensation".

[0057] 2. Nanoscale lubrication system driven by surface energy gradient: 1. Bionic supersurface construction: 1.1. Processing accuracy of micro-nano composite structures: The micron pits are produced using "dual-beam laser interference processing": two femtosecond laser beams with a wavelength of 800nm ​​and an angle of 30° interfere to form light and dark stripes with a period of 50μm. Combined with dynamic mask technology, a hexagonal pit array with a depth of 12±0.5μm and a diameter of 30±1μm is machined on the edge surface (position accuracy ±2μm).

[0058] The nano-columnar protrusions were prepared by "plasma-enhanced chemical vapor deposition": a SiH4 / NH3 mixed gas (flow ratio 1:3) was introduced, and Si3N4 columns with a height of 600±50nm and a diameter of 100±10nm were grown on a 50°C substrate at a rate of 0.1nm / s. The column spacing was 1.5±0.2μm, forming a "lotus effect" surface roughness (Ra=0.05μm).

[0059] 1.2. Gradient surface energy can be precisely controlled: Using "molecular self-assembly gradient coating": first drop-coat perfluorooctyltrichlorosilane (C8F 17 SiCl3) solution (concentration 0.1mmol / L) was used, and the surface energy was gradually transitioned from 30mN / m at the tip to 50mN / m at the base using a volatilization gradient.

[0060] The oil storage cavity is filled with "temperature-sensitive ionic liquid" (1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide salt, with 0.5% mass fraction of graphene quantum dots added). Its surface tension decreases linearly at 0.1mN / m / ℃ with increasing temperature, forming a dynamic adaptation to the edge temperature rise (maximum 80℃).

[0061] 2. Dynamic lubrication film generation mechanism: Shear-thickening lubrication wedge formation: When the punching rate is ≥15 times / s, the shear rate in the contact area reaches 10 6 s -1 , the graphene quantum dots in the ionic liquid undergo a "nano-bridging effect", forming flocculent aggregates with a diameter of 5-10nm, causing the viscosity of the lubricating film to increase sharply from 10mPa·s to 5000mPa·s (shear thickening threshold 0.5GPa).

[0062] The deformation of the micro-nanostructure (1-5μm) is precisely coupled with the amount of lubricant released: 1μm of elastic deformation of the pit corresponds to the release of 2nL of lubricant, which migrates toward the tip at a speed of 0.1mm / s driven by the surface energy gradient (5mN / m / mm), ensuring that the thickness of the lubricant film at the tip is stable at 8±2nm.

[0063] 3. Self-powered dynamic compensation mechanism: 1. Piezoelectric-SMA composite support: 1.1. Preparation process of layered composite sheets Using "low temperature co-fired ceramic technology" to make PZT-5H piezoelectric sheets (thickness 0.1mm, d 33 =500pC / N) and Ni-TiSMA wire (diameter 0.2mm, austenite phase transition temperature 60℃) integration: SMA wires are arranged in a serpentine pattern with a pitch of 0.5mm between the piezoelectric sheets, and an electro-mechanical coupling interface is formed by silver-based solder (melting point 200℃).

[0064] The polarization treatment of the piezoelectric sheet adopts "pulsed electric field induction": 5 cycles of square wave voltage (frequency 1kHz) are applied under an electric field of 10kV / mm to increase the degree of electric domain orientation and improve the energy conversion efficiency.

[0065] 1.2. Thermal-electrical-mechanical coupling control logic: Built-in microprocessor executes "adaptive fuzzy control algorithm": Collect the charge signal of the piezoelectric piece (resolution 1pC) and extract the wear characteristic frequency (10-100Hz) through wavelet transform; Based on the wear profile evolution differential equation, the target shape variable is calculated: ; is the punching frequency, is the phase compensation angle; The output PWM signal controls the SMA heating resistor, so that the SMA wire completes the phase transformation from martensite to austenite within 50ms and generates reversible strain.

[0066] 2. Closed-loop self-calibration system: Stress distribution inverse solution algorithm Using the inverse piezoelectric effect of piezoelectric ceramics, a "stress-charge density matrix" is established: ; in: is the charge of each piezoelectric piece, is the sensitive area (1mm²), and the weight coefficients of the three sensitive areas are determined by finite element modal analysis.

[0067] The microprocessor has a built-in "hidden Markov model of wear state" and establishes a feature library of 20 wear patterns through 1,000 pre-training sessions. It can identify the stages of edge curvature changes in real time and automatically switch compensation strategies (such as focusing on lubrication compensation in the early stage and focusing on geometric compensation in the later stage).

[0068] Summarize: Using directional solidification technology to create crystal orientation gradient (cutting-edge <111> Crystal face, base <001> Crystal plane), the anisotropic wear characteristics of the material are used to achieve directional wear of "fast at the tip and slow at the base", so that the wear profile evolves according to the inverse parabola mathematical model, actively compensating for the thickness fluctuation of the blank and the elastic deformation of the mold; the nano-twin layer is prepared with the assistance of a pulsed magnetic field (the twin boundary density is controllable), and the contact stress is dissipated by dislocation slip, which converts the "coating bearing stress" into "energy dissipation inside the matrix", fundamentally avoiding coating peeling.

[0069] Double-beam laser interference processing of micron pits and plasma-deposited nano-columnar protrusions are used to construct a micro-nano composite oil storage structure. Combined with molecular self-assembly technology, a surface energy gradient is formed (gradually increasing from the tip to the base), driving the directional migration of the lubricating fluid to the high-wear area; temperature-sensitive ionic liquid (including graphene quantum dots) is filled, and the nano-bridging effect under high-speed shear is used to trigger the shear thickening of the lubricating film, thereby improving the load-bearing capacity of the film layer and stabilizing the thickness, eliminating lubrication blind spots.

[0070] Piezoelectric sheets and SMA wires are integrated to prepare layered composite supports. The piezoelectric effect is used to monitor wear characteristic signals in real time. Dynamic adjustment of edge shape (matching response time with wear rate) is achieved through SMA phase change drive, forming a closed-loop coupling with the preset wear profile. A self-calibration system based on the stress-charge density matrix and hidden Markov model is constructed to identify wear patterns in real time and switch compensation strategies (cooperation of lubrication compensation and geometric compensation) to eliminate material guide angle deviation.

Claims

1. A method for suppressing wear of a stamping die with a micro-curvature of a flower-shaped float valve guide edge, characterized in that: The following steps are involved: Based on the crystal orientation gradient, a controllable wear profile is constructed, and the edge tip is controlled by directional solidification. <111> Crystal face, base <001> Crystal planes, forming differentiated wear rates; Preparation of nano-twin layer interface engineering, with the assistance of pulsed magnetic field, the twin boundary density of 1.2×10 10 / cm² nanotwin network; Geometry-wear coupling: Establish the inverse parabolic preform wear evolution equation considering the contact stress distribution; Construct a nanoscale lubrication system driven by surface energy gradient, and control the directional migration of lubricating fluid through micro-nano composite structure and gradient surface energy; The self-powered dynamic compensation mechanism with integrated piezoelectric-SMA composite support adjusts the edge shape in real time to compensate for wear.

2. The method for suppressing wear of a stamping die with a micro-curvature guide edge of a flower-shaped float valve according to claim 1, characterized in that: During directional solidification control, the angle between the crystal plane normal and the wear direction is controlled at 75°±2° through dynamic modulation of temperature gradient and magnetic field-assisted in-situ monitoring.

3. The method for suppressing wear of a stamping die with a micro-curvature guide edge of a flower-shaped float valve according to claim 1, characterized in that: The nano-twin layer was prepared by pulsed magnetic field assisted laser cladding, and a 50kHz alternating magnetic field was introduced to make the twin boundaries precipitate uniformly at 0.1μm intervals.

4. The method for suppressing wear of a stamping die with a micro-curvature guide edge of a flower-shaped float valve according to claim 1, characterized in that: The wear evolution equation of the inverse parabolic preform is: ； in: : Time rate of change of curvature radius; : material wear coefficient; : position-time dependent contact stress; : elastic modulus of material; : Correction index based on the Stribeck curve; : The angle between the crystal plane normal and the wear direction.

5. The method for suppressing wear of a stamping die with a micro-curvature guide edge of a flower-shaped float valve according to claim 1, characterized in that: The micro-nano composite structure is constructed by dual-beam laser interference processing of micron pits and plasma deposition of nano-columnar protrusions.

6. The method for suppressing wear of a stamping die with a micro-curvature guide edge of a flower-shaped float valve according to claim 1, wherein: The surface energy gradient was achieved by molecular self-assembly gradient coating of perfluorooctyltrichlorosilane solution, so that the surface energy gradually transitioned from 30 mN / m at the tip to 50 mN / m at the base.

7. The method for suppressing wear of a stamping die with a micro-curvature guide edge of a flower-shaped float valve according to claim 1, characterized in that: The piezoelectric-SMA composite support integrates PZT-5H piezoelectric sheets and Ni-TiSMA wires through low-temperature co-fired ceramics. The SMA wires are arranged in a serpentine shape with a spacing of 0.5 mm.

8. The method for suppressing wear of a stamping die with a micro-curvature guide edge of a flower-shaped float valve according to claim 1, characterized in that: In the control logic of the dynamic compensation mechanism, the stress-charge density matrix is ​​used: ； in: is the charge of each piezoelectric piece, The weight coefficients of the three sensitive areas are determined by finite element modal analysis.

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