Connecting material reinforcing structure design method and system for hardware steel sheet product

Abstract

The invention relates to the technical field of hardware product production and processing, and provides a method and a system for designing a connecting material reinforcing structure for a hardware steel sheet product, and the method comprises the following steps: identifying a core bearing area and a key load working condition of a connecting material structure corresponding to the hardware steel sheet product under a mechanical state evolution trend; calculating a stress concentration coefficient and a fatigue damage threshold value of the core bearing area under the key load working condition so as to determine a target strength value required by the core bearing area; according to the target strength value, a gradient strength distribution map of the connecting material structure under the key load working condition is constructed, and a corresponding enhanced topological configuration of the connecting material structure in the core bearing area is defined; and determining variable cross-section distribution characteristics of the connecting material structure, and outputting a connecting material structure enhancement scheme of the hardware steel sheet product in combination with the gradient strength distribution atlas and the enhanced topological configuration. According to the invention, the balance between the bearing performance and the manufacturability of the material connecting structure can be ensured, and the problems of local fracture and instability are effectively avoided.

Description

Technical Field

[0001] This invention relates to a method and system for designing a continuous reinforcement structure for metal sheet products, belonging to the field of metal product manufacturing and processing technology. Background Technology

[0002] With the improvement of industrial automation and the upgrading of precision manufacturing requirements, metal steel sheets are widely used in electronic equipment, automotive parts, machinery and other fields. A reliable continuous material structure is not only the core to ensure the processing accuracy of steel sheets and improve production efficiency, but also directly related to the structural stability and service life of the finished product.

[0003] Currently, the design of continuous material structures for metal sheet products mostly adopts a fixed design for a single product model. It is based on the final shape of the metal sheet product and is designed once based on experience to form a continuous material structure that is permanently bound to the mold. Although this design method can shorten the mold manufacturing cycle by simplifying the design process, it does not consider the stress accumulation effect caused by multi-process stamping during the design process. As a result, the continuous material structure is prone to local breakage due to stress concentration in actual production. Summary of the Invention

[0004] This invention provides a design method and system for a continuous reinforcement structure for metal sheet products. Its main purpose is to ensure a balance between load-bearing capacity and manufacturability of the continuous structure, effectively avoiding local fracture and instability problems.

[0005] To achieve the above objectives, the present invention provides a method for designing a continuous reinforcement structure for hardware steel sheet products, comprising:

[0006] The stress distribution data of the metal steel sheet product during the multi-process continuous stamping process is obtained in order to analyze the mechanical state evolution trend of the metal steel sheet product in the stamping process and identify the core bearing area and key load conditions of the continuous material structure corresponding to the metal steel sheet product under the mechanical state evolution trend.

[0007] Calculate the stress concentration factor and fatigue damage threshold of the core load-bearing area under the critical load condition to determine the target strength value required for the core load-bearing area. Based on the target strength value, construct the gradient strength distribution map of the continuous material structure under the critical load condition.

[0008] Based on the gradient intensity distribution map, the enhanced topology configuration of the connecting material structure corresponding to the core bearing area is defined, and the stress gradient distribution characteristics and load spectrum characteristics in the mechanical state evolution trend are analyzed to determine the variable cross-section distribution characteristics of the connecting material structure.

[0009] By integrating the enhanced topology, the variable cross-section distribution characteristics, and the gradient intensity distribution map, a reinforcement scheme for the continuous material structure of the hardware steel sheet product is output.

[0010] Optionally, based on the target strength value, a gradient strength distribution map of the continuous material structure under the critical load condition is constructed, including:

[0011] The geometric model of the continuous material structure is spatially discretized to obtain a finite element mesh;

[0012] The target strength value is assigned to the corresponding node in the finite element mesh and used as the node strength reference value;

[0013] Locate the remaining area outside the core bearing area corresponding to the target strength value, and calculate the required strength value for each node in the remaining area based on the node strength benchmark value;

[0014] By fusing the node strength baseline value and the demand strength value, a complete node strength dataset is obtained;

[0015] After visualizing and rendering the complete node strength dataset, the gradient strength distribution map is obtained.

[0016] Optionally, based on the node strength benchmark value, the required intensity value corresponding to each node in the remaining region is calculated, including:

[0017] Identify the spatial topological relationship between the remaining region and the core bearing region;

[0018] Analyze the stress transfer characteristics of the remaining region under the critical load conditions;

[0019] Based on the spatial topology and stress transfer law, the node strength benchmark value is transferred from each node in the core bearing area to each node in the remaining area to obtain the required strength value corresponding to each node in the remaining area.

[0020] Optionally, based on the gradient intensity distribution map, a reinforced topology configuration corresponding to the core bearing region of the connecting structure is defined, including:

[0021] The intensity requirement values ​​at each location in the core bearing area of ​​the gradient intensity distribution map are converted into the target values ​​of the material relative density at the corresponding locations.

[0022] Based on the target value of the material's relative density, the distribution pattern of the target material within the core bearing area is identified;

[0023] Based on the distribution pattern of the target material, the connected regions within the core bearing area with material density higher than a preset threshold are extracted, and a three-dimensional solid model corresponding to the connected regions is generated.

[0024] Based on the three-dimensional solid model, the enhanced topology configuration of the connecting structure corresponding to the core bearing area is defined.

[0025] Optionally, the intensity requirement values ​​at each location in the core bearing area of ​​the gradient intensity distribution map are converted into target values ​​for the material relative density at the corresponding locations, including:

[0026] Obtain the reference yield strength of the material used in the continuous material structure;

[0027] Calculate the ratio between the strength requirement value and the reference yield strength to obtain the strength requirement ratio at the corresponding position;

[0028] The strength requirement ratio is converted into the target value of the material's relative density through a preset mapping relationship.

[0029] Optionally, the stress gradient distribution characteristics and load spectrum characteristics in the mechanical state evolution trend are analyzed to determine the variable cross-section distribution characteristics of the continuous material structure, including:

[0030] Based on the stress gradient distribution characteristics, the main load-bearing path in the continuous material structure is identified;

[0031] Extract the key load cycle parameters corresponding to the main load path from the load spectrum features. The key load cycle parameters include the peak load and the load cycle amplitude.

[0032] Based on the main load-bearing path and the key load cycle parameters, the trajectory of the change in the cross-sectional moment of inertia of the continuous material structure is analyzed.

[0033] Extract the variable cross-section distribution characteristics of the continuous material structure from the trajectory of the change of the moment of inertia of the cross section.

[0034] Optionally, the core load-bearing area and key load conditions of the connecting structure corresponding to the hardware steel sheet product under the mechanical state evolution trend are identified, including:

[0035] Obtain the time-series data of stress distribution of the continuous material structure under the evolution trend of the mechanical state;

[0036] Based on the stress distribution time series data, the cumulative fatigue damage value and the peak value of the maximum principal stress in each region of the continuous material structure are calculated;

[0037] When the cumulative fatigue damage value of the region exceeds the preset damage tolerance threshold, and the peak value of the maximum principal stress in the region exceeds the preset allowable stress threshold of the material, the region is determined to be the core load-bearing region.

[0038] Identify the stamping process step corresponding to when the core load-bearing area reaches the peak value of the maximum principal stress, and take the stamping process step as the key load condition.

[0039] Optionally, based on the stress distribution time series data, the cumulative fatigue damage value and the peak value of the maximum principal stress in each region of the continuous material structure are calculated, including:

[0040] Extract the historical cyclic stress corresponding to each region of the continuous material structure during the entire stamping process from the stress distribution time series data;

[0041] Based on the historical cyclic stress, the cumulative fatigue damage value of each region of the continuous material structure is calculated;

[0042] Based on the stress distribution time series data, all principal stress extreme values ​​appearing in each region of the continuous material structure during all stamping processes are determined, and the maximum value among the principal stress extreme values ​​is defined as the maximum principal stress peak value.

[0043] Optionally, the stress concentration factor of the core load-bearing region under critical load conditions is calculated, including:

[0044] Obtain the local maximum stress value of the core load-bearing area under critical load conditions;

[0045] Calculate the reference stress value of the core load-bearing area under the same load conditions;

[0046] Based on the local maximum stress value and the reference stress value, the stress concentration factor of the core bearing area under critical load conditions is calculated.

[0047] To address the aforementioned problems, the present invention also provides a continuous reinforcement structure design system for hardware steel sheet products, the system comprising:

[0048] The state perception module is used to acquire stress distribution data of the hardware steel sheet product during the multi-process continuous stamping process, so as to analyze the mechanical state evolution trend of the hardware steel sheet product in the stamping process and identify the core bearing area and key load conditions of the connecting structure corresponding to the hardware steel sheet product under the mechanical state evolution trend.

[0049] The strength quantification module is used to calculate the stress concentration factor and fatigue damage threshold of the core load-bearing area under the critical load conditions, so as to determine the target strength value required for the core load-bearing area, and construct the gradient strength distribution map of the continuous material structure under the critical load conditions based on the target strength value.

[0050] The configuration generation module is used to define the enhanced topology configuration of the connecting material structure in the core bearing area based on the gradient intensity distribution map, and to analyze the stress gradient distribution characteristics and load spectrum characteristics in the mechanical state evolution trend in order to determine the variable cross-section distribution characteristics of the connecting material structure.

[0051] The solution output module is used to integrate the enhanced topology, the variable cross-section distribution characteristics, and the gradient intensity distribution map to output the reinforcement solution for the continuous material structure of the hardware steel sheet product.

[0052] Compared to the problems described in the background art, this invention, by analyzing the mechanical state evolution trend of the metal sheet product during the stamping process, can dynamically track and locate the stress changes of the continuous material structure from feeding to forming, thereby identifying high-risk areas where stress concentration continuously intensifies. Furthermore, by identifying the core load-bearing area and key load conditions of the continuous material structure corresponding to the metal sheet product under the mechanical state evolution trend, this invention can accurately locate the most easily fractured position on the continuous material and its corresponding dangerous processing moment, enabling subsequent reinforcement design to avoid ineffective material stacking and strength waste. By determining the target strength value required for the core load-bearing area, this invention can achieve quantitative strength design for key areas of the continuous material structure, thereby ensuring that the reinforcement scheme can meet both the static strength safety margin under peak load and the fatigue performance requirements under the entire process cycle. Furthermore, the purpose of constructing a gradient strength distribution map of the continuous material structure under the key load conditions based on the target strength value is to extend the local strength requirements to the design basis of the overall structure, thereby guiding… The optimized distribution and precise reinforcement of the connecting material in the continuous material structure: Based on the gradient strength distribution map, this embodiment of the invention defines the reinforcement topology of the continuous material structure corresponding to the core load-bearing area. This directly transforms the strength distribution requirements into a specific and manufacturable geometric shape and spatial layout of the continuous material structure. This ensures the feasibility of forming the reinforced structure and the original continuous material throughout the stamping process, while guaranteeing that the continuous material structure meets the multi-process stamping load-bearing requirements. Furthermore, this embodiment of the invention analyzes the stress gradient distribution characteristics and load spectrum characteristics in the mechanical state evolution trend to determine the variable cross-section distribution characteristics of the continuous material structure. This ensures that the cross-sectional change law of the continuous material structure matches the magnitude and direction of the load it bears during the actual stamping process, avoiding local instability problems caused by improper cross-section design. Finally, this embodiment of the invention integrates the reinforcement topology, the variable cross-section distribution characteristics, and the gradient strength distribution map to output a reinforcement scheme for the continuous material structure of the hardware steel sheet product. This ensures a balance between load-bearing performance and manufacturability of the continuous material structure, effectively avoiding local fracture and instability problems. Therefore, the present invention can ensure a balance between load-bearing capacity and manufacturability in continuous material structures, effectively avoiding local fracture and instability problems. Attached Figure Description

[0053] Figure 1 This is a flowchart illustrating a method for designing a continuous reinforcement structure for hardware steel sheet products, as provided in an embodiment of the present invention.

[0054] Figure 2 A schematic diagram of material transfer and stress evolution in the stamping process of a hardware steel sheet product that implements the continuous material reinforcement structure design method for hardware steel sheet products according to an embodiment of the present invention;

[0055] Figure 3 A schematic diagram of a continuous material reinforcement structure for implementing the continuous material reinforcement structure design method for hardware steel sheet products is provided in an embodiment of the present invention;

[0056] Figure 4 A functional module diagram of a continuous material reinforcement structure design system for hardware steel sheet products is provided as an embodiment of the present invention.

[0057] Figure 5 A schematic diagram of a computer device for a continuous reinforcement structure design method for hardware steel sheet products, provided in an embodiment of the present invention;

[0058] The objectives, features, and advantages of this invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0059] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0060] This application provides a method for designing a continuous reinforcement structure for metal sheet products. The execution subject of this method includes, but is not limited to, at least one electronic device configured to execute the method provided in this application, such as a server or a terminal. In other words, the method for designing a continuous reinforcement structure for metal sheet products can be executed by software or hardware installed on a terminal device or a server device. The server includes, but is not limited to, a single server, a server cluster, a cloud server, or a cloud server cluster.

[0061] S1. Obtain stress distribution data of the metal sheet product during the multi-process continuous stamping process, so as to analyze the mechanical state evolution trend of the metal sheet product in the stamping process, and identify the core bearing area and key load conditions of the connecting structure corresponding to the metal sheet product under the mechanical state evolution trend.

[0062] This invention, by acquiring stress distribution data of metal steel sheets during multi-process stamping, can monitor the stress state of the material in each process in real time, thereby identifying the weakest link in the continuous material structure that is most prone to breakage and its cause, providing a basis for subsequent reinforcement design.

[0063] The aforementioned metal sheet products refer to metal structural parts manufactured by stamping, including but not limited to connecting pieces, spring sheets, shells, and bracket parts; the aforementioned multi-process includes at least two stamping processes executed consecutively, such as blanking, bending, stretching, flanging, and cutting; the aforementioned stress distribution data refers to field data reflecting the changes in the magnitude and direction of stress at various locations of the material over time during the stamping process.

[0064] Optionally, the stress distribution data of the metal sheet product during the multi-process continuous stamping process can be obtained through finite element simulation. For example, the explicit dynamic finite element method known in the art can be used to establish a finite element model including progressive die, sheet metal and connecting material structure, and the stress spatiotemporal distribution data of the connecting material structure in the whole process can be obtained by solving the calculation.

[0065] Furthermore, by analyzing the mechanical state evolution trend of the metal sheet product during the stamping process, this embodiment of the invention can dynamically track and locate the stress changes of the continuous material structure from feeding to forming, thereby identifying high-risk areas where stress concentration continuously intensifies. The mechanical state evolution trend reflects the dynamic changes in the magnitude, direction, and distribution of stress in the continuous material structure during continuous stamping, such as... Figure 2 The diagram illustrates the material transfer and stress evolution of a metal sheet product during the stamping process, as provided in an embodiment of the present invention for implementing a continuous material reinforcement structure design method for metal sheet products. The diagram visually reveals the dynamic evolution of stress states between different material regions (1-5) and different forming stages (A-D) during multi-stage continuous stamping. Specifically: from the initial stage, region 1 continuously bears uniform radial tensile stress, resulting in relatively stable deformation; region 2 experiences combined bending and tensile stress in stage A, gradually transitioning to pure radial tensile stress in subsequent stages, becoming a key node for the transfer of stamping pressure to external regions; regions 3 to 5 sequentially repeat the above stress evolution process, forming a progressive migration of the stress field in space and time. This evolution process not only clearly demonstrates the stress gradient distribution in both radial and temporal dimensions but also reveals the path characteristics of load transfer along the material flow direction, providing direct physical basis for identifying the core load-bearing area of ​​the continuous material structure, determining key load conditions, and constructing subsequent gradient strength maps.

[0066] Optionally, the mechanical state evolution trend of the metal sheet product in the stamping process can be analyzed by numerical simulation based on explicit dynamic finite element software, such as LS-DYNA software. Specifically, in the simulation environment, a contact-separation model of progressive die and sheet metal is established according to actual process parameters. The stress-strain field of the entire sheet metal at each time step is calculated by the solver, and the equivalent stress time series curve of the key path node of the continuous material structure is extracted. Then, the stress mutation point is identified by the first difference of the curve. The period when the stress change rate between adjacent mutation points is continuously higher than the set threshold is determined as the key load-bearing stage, thereby quantifying the mechanical state evolution trend of each stage.

[0067] By identifying the core load-bearing area and critical load conditions of the connecting structure corresponding to the metal sheet product under the trend of mechanical state evolution, this invention can accurately locate the most vulnerable fracture position on the connecting material and its corresponding critical processing moment, so that subsequent reinforcement design can avoid ineffective material stacking and strength waste.

[0068] The connecting material structure refers to a strip or rib-like auxiliary structure that connects multiple independent metal sheet product units onto a continuous strip for positioning, conveying, and supporting between stamping processes. It is usually composed of connecting bridges, process ribs, or auxiliary edge materials. The core load-bearing area refers to the local area with the highest risk of fatigue damage and significant internal stress concentration identified by analyzing the stress distribution data of the connecting material structure during multi-process stamping. The critical load condition refers to the specific stamping process moment in which the core load-bearing area bears the maximum or most complex load during multiple processes in the continuous stamping process, including the maximum blanking load condition, the maximum bending combined stress condition, and the high-cycle alternating load condition.

[0069] As an embodiment of the present invention, the core load-bearing area and key load conditions of the connecting structure corresponding to the hardware steel sheet product under the mechanical state evolution trend are identified, including:

[0070] Obtain the time-series data of stress distribution of the continuous material structure under the evolution trend of the mechanical state;

[0071] Based on the stress distribution time series data, the cumulative fatigue damage value and the peak value of the maximum principal stress in each region of the continuous material structure are calculated;

[0072] When the cumulative fatigue damage value of the region exceeds the preset damage tolerance threshold, and the peak value of the maximum principal stress in the region exceeds the preset allowable stress threshold of the material, the region is determined to be the core load-bearing region.

[0073] Identify the stamping process step corresponding to when the core load-bearing area reaches the peak value of the maximum principal stress, and take the stamping process step as the key load condition.

[0074] The cumulative fatigue damage value is a quantitative assessment of the cyclic stress experienced by a specific area of ​​the continuous material structure during the entire stamping process. The higher the value, the greater the risk of fatigue failure. The peak value of the maximum principal stress refers to the maximum value among all the instantaneous principal stress values ​​experienced by the specific area of ​​the continuous material structure during the entire stamping process in the stress distribution time series data. The damage tolerance threshold is a critical value pre-set based on the material fatigue performance, product safety factor, and process reliability requirements. When the cumulative fatigue damage value exceeds this threshold, it is determined that the area has an unacceptable risk of fatigue failure within the predetermined lifespan. The allowable stress threshold of the material refers to the upper limit of the allowable stress determined based on the yield strength or tensile strength of the hardware material used in the continuous material structure and considering the safety factor. It is used to determine whether the structure will undergo plastic deformation or fracture under static load. The stamping process step refers to an independent processing link with specific mold actions and forming purposes in a multi-process continuous stamping process, such as blanking, punching, bending, stretching, and shaping. Each step corresponds to a unique time node.

[0075] As an optional embodiment of the present invention, based on the stress distribution time series data, the cumulative fatigue damage value and the peak value of the maximum principal stress in each region of the continuous material structure are calculated, including:

[0076] Extract the historical cyclic stress corresponding to each region of the continuous material structure during the entire stamping process from the stress distribution time series data;

[0077] Based on the historical cyclic stress, the cumulative fatigue damage value of each region of the continuous material structure is calculated;

[0078] Based on the stress distribution time series data, all principal stress extreme values ​​appearing in each region of the continuous material structure during all stamping processes are determined, and the maximum value among the principal stress extreme values ​​is defined as the maximum principal stress peak value.

[0079] The historical cyclic stress refers to the complete record of the stress changes over time in a region during the entire stamping process, extracted from the stress distribution time series data by region. The record contains information on stress amplitude, mean, and number of cycles, and is the basic input data for calculating fatigue damage. The principal stress extreme value refers to the local maximum value of the first principal stress (maximum principal stress) calculated at all time steps or process nodes in a certain region in the stress distribution time series data. It reflects the extreme tensile or compressive stress state that the region is subjected to at a specific processing moment.

[0080] Optionally, the cumulative fatigue damage value of each region of the continuous material structure can be calculated using a material fatigue characteristic model, such as Miner's linear cumulative damage rule; all principal stress extreme values ​​appearing in each region of the continuous material structure during all stamping processes can be determined by performing time series peak detection on the stress distribution time series data.

[0081] S2. Calculate the stress concentration factor and fatigue damage threshold of the core load-bearing area under critical load conditions to determine the target strength value required for the core load-bearing area. Based on the target strength value, construct the gradient strength distribution map of the continuous material structure under the critical load conditions.

[0082] The purpose of this invention in calculating the stress concentration factor and fatigue damage threshold of the core load-bearing region under critical load conditions is to provide quantitative strength targets and life basis for the reinforcement design of continuous material structures, thereby achieving precise reinforcement of the continuous material structures. The stress concentration factor is a quantitative indicator reflecting the degree of stress amplification in the core load-bearing region, used to characterize the multiple relationship between the local stress level in this region and the reference stress level. The fatigue damage threshold refers to the maximum critical value of damage allowed to accumulate in the core load-bearing region during the stamping process, determined based on the material fatigue performance. Exceeding this value indicates a risk of fatigue failure.

[0083] As an embodiment of the present invention, calculating the stress concentration factor of the core load-bearing region under critical load conditions includes:

[0084] Obtain the local maximum stress value of the core load-bearing area under critical load conditions;

[0085] Calculate the reference stress value of the core load-bearing area under the same load conditions;

[0086] Based on the local maximum stress value and the reference stress value, the stress concentration factor of the core bearing area under critical load conditions is calculated.

[0087] For example, the stress concentration factor is calculated using the following formula. It should be noted that this calculation method is only one possible method and does not affect the implementation of the basic scheme described above:

[0088]

[0089] in, Indicates the stress concentration factor. This indicates the local maximum stress peak value that occurs in the core load-bearing area under the critical load condition. This represents the reference stress value corresponding to the core load-bearing area under the same working condition. This indicates the amplitude of local stress variation in the core load-bearing area between adjacent processes under critical load conditions. This indicates the magnitude of the reference stress change between adjacent processes. This represents the process correlation coefficient.

[0090] It should be noted that the above formula incorporates the peak stress ratio under key load conditions. Stress fluctuation sensitivity ratio between adjacent processes This can more comprehensively characterize the combined stress amplification effect of continuous material structures under alternating stamping loads due to geometric abrupt changes and process cycles, providing a quantitative indicator that conforms to real working conditions for subsequent gradient strength design. The process correlation coefficient is mentioned here. The values ​​used to characterize specific stamping process characteristics, such as the impact of blanking, bending moment distribution, and the influence of tensile strain path on the sensitivity to dynamic stress fluctuations, can be determined through regression analysis of historical data of the combined material and process of the continuous material structure. For example, 0.3-0.6 can be used for high-strength steel stamping, and 0.5-0.8 can be used for aluminum alloy stamping.

[0091] Furthermore, by determining the target strength value required for the core load-bearing area, the embodiments of the present invention can achieve quantitative strength design for key areas of the continuous material structure, thereby ensuring that the reinforcement scheme can meet both the static strength safety margin under peak load and the fatigue resistance performance requirements under full process cycle. The target strength value refers to the minimum equivalent yield strength value that the core load-bearing area must reach to meet the preset static strength safety requirements and fatigue life requirements, which is determined based on the stress concentration factor and the fatigue damage threshold.

[0092] Optionally, the specific process for determining the target strength value required for the core load-bearing area is as follows: input the stress concentration factor and the fatigue damage threshold into a preset strength calculation model. The strength calculation model is a strength conversion formula established based on the theory of material mechanics and fatigue strength. It is used to comprehensively evaluate the strength requirements under static load and cyclic load. The minimum strength value of the material that can simultaneously meet the static strength safety requirements and the fatigue life requirements is obtained through the formula conversion, and this value is output as the target strength value.

[0093] Furthermore, the purpose of constructing the gradient strength distribution map of the continuous material structure under the key load conditions based on the target strength value in this embodiment of the invention is to extend the local strength requirements to the design basis of the overall structure, thereby guiding the optimized distribution and precise reinforcement of materials in the continuous material structure. The gradient strength distribution map is a strength distribution map formed by continuously mapping and visualizing the required target strength values ​​of each region calculated under the key load conditions according to their spatial position and strength magnitude, using the three-dimensional geometric model of the continuous material structure as a spatial carrier.

[0094] As an embodiment of the present invention, based on the target strength value, a gradient strength distribution map of the continuous material structure under the critical load condition is constructed, including:

[0095] The geometric model of the continuous material structure is spatially discretized to obtain a finite element mesh;

[0096] The target strength value is assigned to the corresponding node in the finite element mesh and used as the node strength reference value;

[0097] Locate the remaining area outside the core bearing area corresponding to the target strength value, and calculate the required strength value for each node in the remaining area based on the node strength benchmark value;

[0098] By fusing the node strength baseline value and the demand strength value, a complete node strength dataset is obtained;

[0099] After visualizing and rendering the complete node strength dataset, the gradient strength distribution map is obtained.

[0100] Wherein, the node strength reference value refers to the known strength requirement data, derived from the target strength value of the core load-bearing region, assigned to the node corresponding to the core load-bearing region in the finite element mesh, and can be used as a constraint reference for constructing the global strength distribution; the remaining region refers to all the remaining parts in the geometric model of the connecting structure, excluding the core load-bearing region that has been identified and assigned a target strength value; the required strength value refers to the material strength level that the connecting structure needs to achieve at each node in its remaining region in order to meet the load-bearing requirements under the key load conditions; the complete node strength dataset refers to the set of strength requirement values ​​that covers all nodes of the finite element mesh of the connecting structure, composed of the node strength reference value and all the required strength values.

[0101] Optionally, the visualization rendering of the complete node strength dataset can be achieved using the built-in rendering engine of finite element post-processing software, such as the ANSYS CFD-Post engine. The node strength data can be directly imported into the engine, and a color mapping table can be set to generate a cloud map.

[0102] As an optional embodiment of the present invention, based on the node strength benchmark value, the required strength value corresponding to each node in the remaining region is calculated, including:

[0103] Identify the spatial topological relationship between the remaining region and the core bearing region;

[0104] Analyze the stress transfer characteristics of the remaining region under the critical load conditions;

[0105] Based on the spatial topology and stress transfer law, the node strength benchmark value is transferred from each node in the core bearing area to each node in the remaining area to obtain the required strength value corresponding to each node in the remaining area.

[0106] The spatial topology relationship refers to the structural associations such as spatial connection, proximity, and relative orientation between nodes in the remaining region and nodes in the core bearing region in the finite element mesh; the stress transfer law refers to the law that the magnitude of mechanical stress decreases or changes with spatial distance or structural path when it diffuses from the core bearing region to the remaining region under the critical load condition.

[0107] Optionally, the stress transmission pattern of the remaining region under the critical load condition can be analyzed using a stress transmission path tracing algorithm. Specifically, starting from the core bearing area, stress transmission paths pointing to the remaining region are generated in the finite element mesh along the principal stress direction field under the critical load condition; stress values ​​are extracted from nodes along each transmission path, and the attenuation function of stress with path distance is calculated to obtain the stress transmission pattern of the remaining region, wherein the attenuation function includes: , This represents the predicted stress value at a distance d from the stress source point along the transmission path. The initial stress value at the stress source point is represented by k, which represents the stress attenuation coefficient. This coefficient can be determined by nonlinear least squares fitting of the extracted nodal stress values ​​and path distance data. The radial basis function interpolation algorithm can be used to transfer the nodal strength benchmark value from each node in the core bearing area to each node in the remaining area.

[0108] S3. Based on the gradient intensity distribution map, define the enhanced topology configuration of the connecting material structure in the core bearing area, and analyze the stress gradient distribution characteristics and load spectrum characteristics in the mechanical state evolution trend to determine the variable cross-section distribution characteristics of the connecting material structure.

[0109] Based on the gradient intensity distribution map, this invention defines the reinforced topology configuration of the connecting material structure corresponding to the core load-bearing area. This can directly transform the intensity distribution requirements into a specific and manufacturable geometry and spatial layout of the connecting material structure. Thus, while ensuring that the connecting material structure meets the multi-process stamping load-bearing requirements, it ensures the forming feasibility of the reinforced structure and the original connecting material in the entire stamping process. The reinforced topology configuration refers to a specific geometric structure defined on the core load-bearing area to enhance the load-bearing capacity of the area in order to achieve the intensity value required by the gradient intensity distribution map.

[0110] As an embodiment of the present invention, based on the gradient intensity distribution map, a reinforced topology configuration of the connecting structure corresponding to the core bearing region is defined, including:

[0111] The intensity requirement values ​​at each location in the core bearing area of ​​the gradient intensity distribution map are converted into the target values ​​of the material relative density at the corresponding locations.

[0112] Based on the target value of the material's relative density, the distribution pattern of the target material within the core bearing area is identified;

[0113] Based on the distribution pattern of the target material, the connected regions within the core bearing area with material density higher than a preset threshold are extracted, and a three-dimensional solid model corresponding to the connected regions is generated.

[0114] Based on the three-dimensional solid model, the enhanced topology configuration of the connecting structure corresponding to the core bearing area is defined.

[0115] The target relative density value of the material is used to characterize the material filling ratio required at the corresponding location, and its value ranges from 0 to 1. The target material distribution pattern refers to the optimal material distribution state that meets the strength requirements, calculated by a topology optimization algorithm with the target relative density value as a constraint. The connected region refers to a continuous three-dimensional spatial range identified from the target material distribution pattern, consisting of adjacent spatial points with a relative density higher than the preset threshold. The construction process of the three-dimensional solid model corresponding to the connected region is as follows: first, the connected region is converted into a voxel model using a voxelization method, and then the voxel model is subjected to three-dimensional contour extraction and solid modeling. The voxelization method can be an octree-based voxelization algorithm, and the three-dimensional contour extraction algorithm can be a moving cube algorithm.

[0116] Optionally, the target material distribution pattern within the core bearing area can be identified using a topology optimization algorithm, such as the variable density method. Specifically, the target relative density of the material is used as the design variable and constraint for spatial distribution. Within the geometric space of the core bearing area, the variable density method is used for iterative calculation. The spatial distribution result of the relative density of each unit material when the iterative convergence condition is met is defined as the target material distribution pattern.

[0117] As an optional embodiment of the present invention, converting the intensity requirement values ​​at each location of the core bearing area in the gradient intensity distribution map into the corresponding material relative density target values ​​includes:

[0118] Obtain the reference yield strength of the material used in the continuous material structure;

[0119] Calculate the ratio between the strength requirement value and the reference yield strength to obtain the strength requirement ratio at the corresponding position;

[0120] The strength requirement ratio is converted into the target value of the material's relative density through a preset mapping relationship.

[0121] The material used in the connecting structure can be cold-rolled steel, stainless steel, spring steel, copper alloy, or aluminum alloy, etc., suitable for stamping and forming. The strength requirement ratio is used to characterize the reinforcement requirement multiple of this position relative to the basic strength of the material. The mapping relationship is a linear proportional relationship, specifically expressed as: target value of material relative density = strength requirement ratio × material conversion coefficient, wherein the material conversion coefficient is a constant predetermined based on the strengthening performance of the material used in the connecting structure, and can be determined by regression analysis of historical case data.

[0122] Optionally, the reference yield strength of the material used in the continuous material structure can be obtained by performing a tensile test on the sampled material.

[0123] Furthermore, by analyzing the stress gradient distribution characteristics and load spectrum characteristics in the mechanical state evolution trend, this embodiment of the invention can determine the variable cross-section distribution characteristics of the continuous material structure. This ensures that the cross-section change law of the continuous material structure matches the change law of the magnitude and direction of the load it bears in the actual stamping process, thus avoiding local instability problems caused by improper cross-section design.

[0124] The stress gradient distribution characteristics refer to the distribution and trend of the spatial change rate of the internal stress field of the continuous material structure in the mechanical state evolution trend; the load spectrum characteristics refer to the characteristics of the load experienced by the continuous material structure in the complete stamping process as a function of time or process sequence, including the magnitude, direction, number of cycles and rate of change of the load, which can be obtained by rainflow counting method. For example, the extracted load-time history data can be used to identify and count cycles by rainflow counting method, thereby quantifying the amplitude, mean and number of cycles of the load; the variable cross-section distribution characteristics refer to the characteristics of the geometric dimensions such as the shape, height, width or thickness of the cross-section of the continuous material structure changing continuously according to a specific law along its length direction.

[0125] Optionally, the analytical process for the stress gradient distribution characteristics in the mechanical state evolution trend is as follows: Based on the finite element simulation results corresponding to the mechanical state evolution trend, the element stress data of the continuous material structure at each key process time node is read; subsequently, based on the element stress data, the rate of change of the first principal stress in the three spatial coordinate directions is calculated on the element nodes of the finite element mesh using the central difference method, thereby obtaining the stress gradient vector corresponding to each node at each time node; next, spatiotemporal clustering analysis is performed on the node stress gradient vectors of all time nodes to identify the set of spatial regions where the gradient vector direction is stable and its magnitude is consistently higher than the overall average level; finally, the geometric center line, average gradient direction, and magnitude range of the set of spatial regions are output as the stress gradient distribution characteristics.

[0126] As an embodiment of the present invention, the stress gradient distribution characteristics and load spectrum characteristics in the mechanical state evolution trend are analyzed to determine the variable cross-section distribution characteristics of the continuous material structure, including:

[0127] Based on the stress gradient distribution characteristics, the main load-bearing path in the continuous material structure is identified;

[0128] Extract the key load cycle parameters corresponding to the main load path from the load spectrum features. The key load cycle parameters include the peak load and the load cycle amplitude.

[0129] Based on the main load-bearing path and the key load cycle parameters, the trajectory of the change in the cross-sectional moment of inertia of the continuous material structure is analyzed.

[0130] Extract the variable cross-section distribution characteristics of the continuous material structure from the trajectory of the change of the moment of inertia of the cross section.

[0131] The main load-bearing path refers to the spatial directional band with a continuous stress gradient and a high amplitude identified in the stress gradient distribution characteristics, reflecting the continuous spatial channel in the connecting material structure that bears and transmits the main load; the key load cycle parameters are used to quantify the load bearing requirements of the main load-bearing path under multi-process stamping conditions, wherein the peak load characterizes the maximum load limit that the main load-bearing path must withstand, and the load cycle amplitude characterizes the fluctuation range of the load during the stamping process; the cross-sectional moment of inertia change trajectory refers to the curve showing the change law of the cross-sectional moment of inertia of the connecting material structure with spatial position along the direction of the main load-bearing path.

[0132] See Figure 3 The diagram shown is a schematic representation of a continuous material reinforcement structure for implementing the aforementioned design method for a continuous material reinforcement structure of hardware steel sheet products, according to an embodiment of the present invention. This diagram serves as a visual representation of the aforementioned reinforcement topology configuration and variable cross-section distribution characteristics. The high-density hollow area on the right corresponds to the reinforcement topology configuration of the core bearing area, while the continuous solid outline intuitively shows the direction of the main bearing path. The difference in solid thickness in different areas directly reflects the gradient change in the variable cross-section distribution characteristics. At the same time, the integrated continuous material form in the diagram also verifies the compatibility between the reinforcement topology configuration and the original continuous material structure, enhancing the manufacturability of the reinforcement topology configuration and variable cross-section design.

[0133] Optionally, the analysis steps for the trajectory of the moment of inertia variation of the cross section of the connecting structure are as follows: The main load-bearing path is discretized into a series of nodes. Based on the key load cycle parameters, the minimum moment of inertia required at each node to meet the requirements of bending strength and fatigue life is calculated using the equal-strength beam theory in mechanics of materials. The continuous trajectory of the moment of inertia along the path is obtained through curve fitting. The variable cross-section distribution characteristics of the connecting structure can be extracted from the trajectory of the moment of inertia variation using a parameter inversion method. Specifically, based on a preset basic cross-sectional shape, such as a rectangle or trapezoid, a functional relationship is established between the moment of inertia and a single dominant dimension, such as height. Based on this relationship, the continuous variation law of the dominant dimension along the main load-bearing path is deduced from the trajectory of the moment of inertia variation. This variation law can be defined as the variable cross-section distribution characteristics. The functional relationship is set according to the calculation formula for the moment of inertia in mechanics of materials. For example, assuming the basic cross-sectional shape is rectangular, the formula for the moment of inertia of the rectangular cross-section can be expressed as follows: Where b represents the cross-sectional width and h represents the cross-sectional height, under the condition of a fixed width b, the moment of inertia The mathematical relationship between the section height and the cross-sectional height can be expressed as follows: Substituting the moment of inertia value I in the trajectory of the change of the moment of inertia of the cross section into the mathematical relationship, the corresponding sequence of changes in cross section height can be directly calculated. The continuous change law of the geometric dimension along the path represented by the sequence is the variable cross section distribution characteristic.

[0134] S4. Integrate the enhanced topology, the variable cross-section distribution characteristics, and the gradient intensity distribution map to output the continuous material structure enhancement scheme for the hardware steel sheet product.

[0135] This invention, by integrating the enhanced topology, the variable cross-section distribution characteristics, and the gradient intensity distribution map, outputs a reinforcement scheme for the continuous material structure of the hardware steel sheet product. This scheme ensures a balance between load-bearing capacity and manufacturability of the continuous material structure, effectively avoiding local fracture and instability problems.

[0136] Specifically, the steps for outputting the reinforcement scheme for the continuous material structure of the hardware steel sheet product by integrating the enhanced topology, the variable cross-section distribution characteristics, and the gradient intensity distribution map are as follows: Using the main structure defined by the variable cross-section distribution characteristics as the reference geometric framework; performing a three-dimensional Boolean union operation between the reinforcing rib solid model in the enhanced topology and the main structure to obtain the integrated basic model; performing finite element statics and fatigue strength checks on the integrated basic model based on the strength requirement values ​​at corresponding positions in the gradient intensity distribution map; if the check results do not meet the strength requirements, then based on the target strength values ​​at the insufficient strength positions in the gradient intensity distribution map, using a predefined cross-sectional size-strength mapping relationship, calculating the cross-sectional area that the reinforcing rib solid model needs to increase at that location or the local cross-sectional size that the main structure needs to increase, and modifying the corresponding parameters of the integrated basic model accordingly; after modification, a re-check is required until all strength requirements are met; finally, the model that has passed the strength check is output as the reinforcement scheme for the continuous material structure.

[0137] like Figure 4 The diagram shown is a functional block diagram of a continuous material reinforcement structure design system for hardware steel sheet products according to the present invention.

[0138] The continuous reinforcement structure design system 400 for metal sheet products described in this invention can be installed in electronic devices. Depending on the functions implemented, the continuous reinforcement structure design system for metal sheet products includes a state sensing module 401, a strength quantification module 402, a configuration generation module 403, and a scheme output module 404. The module described in this invention can also be called a unit, which refers to a series of computer program segments that can be executed by the processor of an electronic device and can perform a fixed function, and is stored in the memory of the electronic device.

[0139] In this embodiment of the invention, the functions of each module / unit are as follows:

[0140] The state perception module 401 is used to acquire stress distribution data of the hardware steel sheet product during the multi-process continuous stamping process, so as to analyze the mechanical state evolution trend of the hardware steel sheet product in the stamping process and identify the core bearing area and key load conditions of the continuous material structure corresponding to the hardware steel sheet product under the mechanical state evolution trend.

[0141] The strength quantification module 402 is used to calculate the stress concentration factor and fatigue damage threshold of the core bearing area under the critical load condition, so as to determine the target strength value required for the core bearing area, and construct the gradient strength distribution map of the continuous material structure under the critical load condition based on the target strength value.

[0142] The configuration generation module 403 is used to define the enhanced topology configuration of the connecting material structure in the core bearing area based on the gradient intensity distribution map, and to analyze the stress gradient distribution characteristics and load spectrum characteristics in the mechanical state evolution trend in order to determine the variable cross-section distribution characteristics of the connecting material structure.

[0143] The solution output module 404 is used to integrate the enhanced topology, the variable cross-section distribution characteristics, and the gradient intensity distribution map to output the continuous material structure enhancement solution of the hardware steel sheet product.

[0144] In detail, the modules in the continuous reinforcement structure design system 400 for hardware steel sheet products described in this embodiment of the invention adopt the same characteristics as described above during use. Figure 1 The same technical means are used as described in the paper for the design of a continuous reinforcement structure for hardware steel sheet products, and can produce the same technical effect, so they will not be repeated here.

[0145] In one embodiment, a computer device is provided, which may be a server or a client, and its internal structure diagram may be as follows: Figure 5 As shown. The computer device includes a processor, memory, network interface, and database connected via a system bus. The processor provides computing and control capabilities. The memory includes non-volatile and / or volatile storage media and internal memory. The non-volatile storage media stores the operating system, computer programs, and database. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The network interface is used for communication with external clients via a network connection. When the computer program is executed by the processor, it implements functions or steps on the server or client side of a method for designing a continuous reinforcement structure for hardware steel sheet products.

[0146] In one embodiment, a computer device is provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to perform the following steps:

[0147] S1. Obtain stress distribution data of the hardware steel sheet product during the multi-process continuous stamping process, so as to analyze the mechanical state evolution trend of the hardware steel sheet product in the stamping process and identify the core bearing area and key load conditions of the continuous material structure corresponding to the hardware steel sheet product under the mechanical state evolution trend.

[0148] S2. Calculate the stress concentration factor and fatigue damage threshold of the core load-bearing area under the critical load condition to determine the target strength value required for the core load-bearing area. Based on the target strength value, construct the gradient strength distribution map of the continuous material structure under the critical load condition.

[0149] S3. Based on the gradient intensity distribution map, define the enhanced topology configuration of the connecting material structure in the core bearing area, and analyze the stress gradient distribution characteristics and load spectrum characteristics in the mechanical state evolution trend to determine the variable cross-section distribution characteristics of the connecting material structure.

[0150] S4. Integrate the enhanced topology, the variable cross-section distribution characteristics, and the gradient intensity distribution map to output the continuous material structure enhancement scheme for the hardware steel sheet product.

[0151] In one embodiment, a computer-readable storage medium is provided having a computer program stored thereon, the computer program performing the following steps when executed by a processor:

[0152] S1. Obtain stress distribution data of the hardware steel sheet product during the multi-process continuous stamping process, so as to analyze the mechanical state evolution trend of the hardware steel sheet product in the stamping process and identify the core bearing area and key load conditions of the continuous material structure corresponding to the hardware steel sheet product under the mechanical state evolution trend.

[0153] S2. Calculate the stress concentration factor and fatigue damage threshold of the core load-bearing area under the critical load condition to determine the target strength value required for the core load-bearing area. Based on the target strength value, construct the gradient strength distribution map of the continuous material structure under the critical load condition.

[0154] S3. Based on the gradient intensity distribution map, define the enhanced topology configuration of the connecting material structure in the core bearing area, and analyze the stress gradient distribution characteristics and load spectrum characteristics in the mechanical state evolution trend to determine the variable cross-section distribution characteristics of the connecting material structure.

[0155] S4. Integrate the enhanced topology, the variable cross-section distribution characteristics, and the gradient intensity distribution map to output the continuous material structure enhancement scheme for the hardware steel sheet product.

[0156] It should be noted that the functions or steps that can be implemented by the computer-readable storage medium or computer device described above can be referred to the relevant descriptions on the server side and client side in the foregoing method embodiments. To avoid repetition, they will not be described one by one here.

[0157] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium. When executed, the computer program can include the processes of the embodiments of the above methods. Any references to memory, storage, databases, or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), dual data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), RAMbus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), etc.

[0158] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is used as an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above.

[0159] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention.

[0160] Finally, it should be noted that in the above embodiments, each embodiment can be combined with each other or independent. Deleting any one of them will not affect the technical implementation of other embodiments. The above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A method for designing a continuous reinforcement structure for metal sheet products, characterized in that, The method includes: The stress distribution data of the metal steel sheet product during the multi-process continuous stamping process is obtained in order to analyze the mechanical state evolution trend of the metal steel sheet product in the stamping process and identify the core bearing area and key load conditions of the continuous material structure corresponding to the metal steel sheet product under the mechanical state evolution trend. Calculate the stress concentration factor and fatigue damage threshold of the core load-bearing area under the critical load condition to determine the target strength value required for the core load-bearing area. Based on the target strength value, construct the gradient strength distribution map of the continuous material structure under the critical load condition. Based on the gradient intensity distribution map, the enhanced topology configuration of the connecting material structure corresponding to the core bearing area is defined, and the stress gradient distribution characteristics and load spectrum characteristics in the mechanical state evolution trend are analyzed to determine the variable cross-section distribution characteristics of the connecting material structure. By integrating the enhanced topology, the variable cross-section distribution characteristics, and the gradient intensity distribution map, a reinforcement scheme for the continuous material structure of the hardware steel sheet product is output.

2. The method for designing a continuous reinforcement structure for hardware steel sheet products as described in claim 1, characterized in that, Based on the target strength value, a gradient strength distribution map of the continuous material structure under the key load condition is constructed, including: The geometric model of the continuous material structure is spatially discretized to obtain a finite element mesh; The target strength value is assigned to the corresponding node in the finite element mesh and used as the node strength reference value; Locate the remaining area outside the core bearing area corresponding to the target strength value, and calculate the required strength value for each node in the remaining area based on the node strength benchmark value; By fusing the node strength baseline value and the demand strength value, a complete node strength dataset is obtained; After visualizing and rendering the complete node strength dataset, the gradient strength distribution map is obtained.

3. The method for designing a continuous reinforcement structure for hardware steel sheet products as described in claim 2, characterized in that, Based on the node strength benchmark value, calculate the demand strength value corresponding to each node in the remaining region, including: Identify the spatial topological relationship between the remaining region and the core bearing region; Analyze the stress transfer characteristics of the remaining region under the critical load conditions; Based on the spatial topology and stress transfer law, the node strength benchmark value is transferred from each node in the core bearing area to each node in the remaining area to obtain the required strength value corresponding to each node in the remaining area.

4. The method for designing a continuous reinforcement structure for hardware steel sheet products as described in claim 1, characterized in that, Based on the gradient intensity distribution map, the enhanced topology configuration of the connecting structure corresponding to the core bearing area is defined, including: The intensity requirement values ​​at each location in the core bearing area of ​​the gradient intensity distribution map are converted into the target values ​​of the material relative density at the corresponding locations. Based on the target value of the material's relative density, the distribution pattern of the target material within the core bearing area is identified; Based on the distribution pattern of the target material, the connected regions within the core bearing area with material density higher than a preset threshold are extracted, and a three-dimensional solid model corresponding to the connected regions is generated. Based on the three-dimensional solid model, the enhanced topology configuration of the connecting structure corresponding to the core bearing area is defined.

5. The method for designing a continuous reinforcement structure for hardware steel sheet products as described in claim 4, characterized in that, The intensity requirement values ​​at each location in the core bearing area of ​​the gradient intensity distribution map are converted into the corresponding material relative density target values, including: Obtain the reference yield strength of the material used in the continuous material structure; Calculate the ratio between the strength requirement value and the reference yield strength to obtain the strength requirement ratio at the corresponding position; The strength requirement ratio is converted into the target value of the material's relative density through a preset mapping relationship.

6. The method for designing a continuous reinforcement structure for hardware steel sheet products as described in claim 1, characterized in that, Analyzing the stress gradient distribution characteristics and load spectrum characteristics in the evolution trend of the mechanical state to determine the variable cross-section distribution characteristics of the continuous material structure includes: Based on the stress gradient distribution characteristics, the main load-bearing path in the continuous material structure is identified; Extract the key load cycle parameters corresponding to the main load path from the load spectrum features. The key load cycle parameters include the peak load and the load cycle amplitude. Based on the main load-bearing path and the key load cycle parameters, the trajectory of the change in the cross-sectional moment of inertia of the continuous material structure is analyzed. Extract the variable cross-section distribution characteristics of the continuous material structure from the trajectory of the change of the moment of inertia of the cross section.

7. The method for designing a continuous reinforcement structure for hardware steel sheet products as described in claim 1, characterized in that, Identify the core load-bearing area and key load conditions of the connecting structure corresponding to the aforementioned metal sheet product under the mechanical state evolution trend, including: Obtain the time-series data of stress distribution of the continuous material structure under the evolution trend of the mechanical state; Based on the stress distribution time series data, the cumulative fatigue damage value and the peak value of the maximum principal stress in each region of the continuous material structure are calculated; When the cumulative fatigue damage value of the region exceeds the preset damage tolerance threshold, and the peak value of the maximum principal stress in the region exceeds the preset allowable stress threshold of the material, the region is determined to be the core load-bearing region. Identify the stamping process step corresponding to when the core load-bearing area reaches the peak value of the maximum principal stress, and take the stamping process step as the key load condition.

8. The method for designing a continuous reinforcement structure for hardware steel sheet products as described in claim 7, characterized in that, Based on the stress distribution time series data, the cumulative fatigue damage value and peak value of the maximum principal stress in each region of the continuous material structure are calculated, including: Extract the historical cyclic stress corresponding to each region of the continuous material structure during the entire stamping process from the stress distribution time series data; Based on the historical cyclic stress, the cumulative fatigue damage value of each region of the continuous material structure is calculated; Based on the stress distribution time series data, all principal stress extreme values ​​appearing in each region of the continuous material structure during all stamping processes are determined, and the maximum value among the principal stress extreme values ​​is defined as the maximum principal stress peak value.

9. The method for designing a continuous reinforcement structure for hardware steel sheet products as described in claim 1, characterized in that, Calculating the stress concentration factor of the core load-bearing region under critical load conditions includes: Obtain the local maximum stress value of the core load-bearing area under critical load conditions; Calculate the reference stress value of the core load-bearing area under the same load conditions; Based on the local maximum stress value and the reference stress value, the stress concentration factor of the core bearing area under critical load conditions is calculated.

10. A continuous material reinforcement structure design system for hardware steel sheet products, characterized in that, The system includes: The state perception module is used to acquire stress distribution data of the hardware steel sheet product during the multi-process continuous stamping process, so as to analyze the mechanical state evolution trend of the hardware steel sheet product in the stamping process and identify the core bearing area and key load conditions of the connecting structure corresponding to the hardware steel sheet product under the mechanical state evolution trend. The strength quantification module is used to calculate the stress concentration factor and fatigue damage threshold of the core load-bearing area under the critical load conditions, so as to determine the target strength value required for the core load-bearing area, and construct the gradient strength distribution map of the continuous material structure under the critical load conditions based on the target strength value. The configuration generation module is used to define the enhanced topology configuration of the connecting material structure in the core bearing area based on the gradient intensity distribution map, and to analyze the stress gradient distribution characteristics and load spectrum characteristics in the mechanical state evolution trend in order to determine the variable cross-section distribution characteristics of the connecting material structure. The solution output module is used to integrate the enhanced topology, the variable cross-section distribution characteristics, and the gradient intensity distribution map to output the reinforcement solution for the continuous material structure of the hardware steel sheet product.

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