A simulation analysis method and apparatus for wrinkle deformation of the outer plate of a threshold beam based on a coating and baking process.

Abstract

This invention provides a method and apparatus for simulating and analyzing the wrinkling deformation of the outer sill beam plate based on the painting and baking process. The method includes: acquiring measured temperature data of the outer and inner sill beam plates of a base vehicle's body-in-white; processing the measured temperature data; constructing a finite element model for the thermodynamic analysis of the sill beam baking process; creating load modules for different temperature fields on the outer and inner sill beam plates; creating a simulation analysis case for the wrinkling deformation of the outer sill beam plate under painting and baking conditions; calculating the thermal restraint stress from the inner sill beam plate on the outer sill beam plate under different temperature field load modules; and quantitatively assessing whether wrinkling deformation has occurred in the outer sill beam plate. This invention provides a new solution for quantitatively analyzing and assessing the risk of wrinkling deformation in the outer sill beam plate under painting and baking conditions, and can facilitate the effective identification and avoidance of a series of adverse effects caused by baking wrinkling deformation in the outer sill beam plate during the development process.

Description

Technical Field

[0001] This invention relates to the field of automotive technology, and in particular to a method and apparatus for simulating and analyzing the wrinkling deformation of the outer panel of a door sill beam based on a painting and baking process. Background Technology

[0002] As one of the four major processes in vehicle manufacturing, automotive painting is a crucial and critical production step. A good painting process can effectively enhance the corrosion resistance of the vehicle body panels, reduce rust, and thus improve the vehicle's lifespan.

[0003] In the painting workshop, after electrophoresis, the car body needs to be baked at high temperatures to harden the paint coating in the drying oven. However, since the car body is assembled from individual welded sheet metal parts, there are many hollow cavities inside. These cavities affect heat conduction between parts, resulting in a temperature difference between the outer and inner sheet metal parts during baking. This leads to differences in the amount of thermal expansion between the parts. Because the outer sheet metal is exposed, temperature is transferred from the outer sheet metal to the inner sheet metal, resulting in a relatively higher temperature for the outer sheet metal and a relatively lower temperature for the inner sheet metal during baking. For thin carbon steel materials, the coefficient of thermal expansion is generally the same. Therefore, per unit length, the amount of thermal expansion of the outer sheet metal is greater than that of the inner sheet metal during the car body baking process; this results in the outer sheet metal of the door sill beam being subjected to compressive stress (thermal restraint stress) from the inner sheet metal. The outer sheet metal of the door sill beam (also known as the outer door sill beam panel) is relatively thin, typically 0.65mm; the material is generally low-carbon steel DC06 or DC56D, with a low yield strength, typically 110–170MPa. During the car body baking process, when the compressive stress applied by the inner sheet metal of the door sill beam (also known as the inner door sill beam panel) to the outer sheet metal exceeds the yield strength of the outer sheet metal material, plastic deformation will occur in the outer sheet metal, resulting in wrinkling and deformation of the outer sheet metal of the door sill beam.

[0004] If this issue is not assessed during the early stages of vehicle design and is only discovered during the prototype production phase, it will significantly impact the overall vehicle development schedule. This is primarily due to two factors. First, the outer sheet metal of the sill beam is a long-cycle development component, with lengthy mold manufacturing times. When problems arise with the outer sheet metal, the mold needs to be re-made (or repaired), which greatly extends the overall vehicle development cycle and increases R&D costs. Second, and more problematic, the outer sheet metal of the sill beam is an exterior component. Modifying its features will affect the overall vehicle styling, which is a core and high-level aspect of automotive R&D. Once the project enters the prototype production stage, styling changes are extremely difficult. Therefore, it is crucial to conduct a wrinkle deformation performance assessment of the sill beam outer panel based on the painting and baking process during the early stages of vehicle development (data design phase). The significance of simulation analysis lies in assessing the possibility of wrinkling and deformation of the sill beam outer plate through simulation results, and providing reference and optimization guidance for vehicle body design. This allows the optimized sill beam outer plate structure to avoid wrinkling and deformation caused by the painting and baking process, thus avoiding conflicts with the exterior styling and preventing increased vehicle development cycle and costs.

[0005] Currently, research efforts in the automotive industry regarding the painting and baking process primarily focus on making the paint coating on the car body more aesthetically pleasing and durable (coatings have strict requirements for external conditions such as curing temperature and time; only superior drying environments and conditions can yield high-quality coatings). However, there is limited research on how the sill beam outer panel deforms under thermal restraint stress during the baking environment. Current research mainly relies on simplified assessments using "theoretical formulas + ideal models." This approach results in low accuracy, generally providing only directional opinions rather than quantitative conclusions.

[0006] Therefore, overcoming the shortcomings of the existing technology is an urgent problem to be solved in this technical field. Summary of the Invention

[0007] This invention provides a new solution to the technical problem of how to quantitatively analyze and assess the risk of wrinkling and deformation of the outer panel of the door sill beam under the coating and baking state.

[0008] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0009] In a first aspect, the present invention provides a simulation analysis method for wrinkle deformation of the outer plate of a threshold beam based on a coating and baking process, comprising:

[0010] Obtain the measured temperature data of the outer and inner sill beams of the body-in-white of the base vehicle under the painting and baking state, and process the measured temperature data to make the measured temperature data meet the simulation analysis requirements.

[0011] Obtain the vehicle body CAD data and vehicle body BOM information table, and build a finite element model for the baking thermodynamic analysis of the door sill beam based on the vehicle body CAD data and vehicle body BOM information table;

[0012] Based on the preprocessed measured temperature data and the constructed finite element model of the sill beam baking thermodynamic analysis, load modules for different temperature fields of the outer and inner plates of the sill beam were created.

[0013] A simulation analysis of the stress-induced wrinkling and deformation of the outer plate of the sill beam under the coating and baking state was created, and the thermal restraint stress from the inner plate of the sill beam was calculated under different temperature field load modules.

[0014] The calculated thermal restraint stress on the outer plate of the sill beam is compared with the yield strength of the raw material of the outer plate of the sill beam to quantitatively assess whether the outer plate of the sill beam has wrinkled or deformed.

[0015] Preferably, obtaining the measured temperature data of the outer and inner sill beams of the body-in-white of the base vehicle under the painting and baking state includes:

[0016] Temperature sensors are placed in the flat area of ​​the door sill beam of the body-in-white of the base vehicle.

[0017] Temperature sensors are used to measure the temperature of the outer and inner sill beams of the body-in-white of the base vehicle.

[0018] Preferably, the processing of the measured temperature data includes:

[0019] Noise data was removed from the measured temperature data to obtain smooth temperature data curves for the outer and inner panels of the sill beam.

[0020] The temperature data curves of the outer and inner plates of the sill beam are discretized into data points.

[0021] Based on the time axis, the data points are grouped to ensure that each group of data points corresponds to a unique temperature value for the outer and inner plates of the sill beam at each moment.

[0022] Preferably, the step of constructing a finite element model for the baking thermodynamic analysis of the sill beam based on the vehicle body CAD data and the vehicle body BOM information table includes:

[0023] Import the vehicle body CAD data into Hyperworks or Ansa software;

[0024] The body-in-white model is obtained by modeling the parts in the body CAD data using Hyperworks or Ansa software.

[0025] Based on the vehicle body BOM information table, assign values ​​to the parts in the vehicle body CAD data.

[0026] Preferably, the components in the CAD data include the vehicle body, weld points, and structural adhesive.

[0027] Preferably, the module for creating different temperature field loads on the outer and inner plates of the sill beam includes:

[0028] Obtain the grouped data points and preset the corresponding number of temperature load cards;

[0029] The temperature values ​​corresponding to the grouped data points are sequentially set into the temperature load cards to obtain different temperature field load modules.

[0030] Preferably, the simulation analysis of the stress-induced wrinkling and deformation of the sill beam outer plate under the coating and baking state includes:

[0031] The body-in-white model is partially cropped, retaining the outer and inner panels of the sill beam;

[0032] Constrain the cross-section of the body-in-white model;

[0033] Different temperature field load modules are applied to the outer and inner plate areas of the sill beam.

[0034] Preferably, the calculation of the thermal restraint stress from the inner plate of the sill beam under different temperature field load modules includes:

[0035] The thermal expansion strain of the outer and inner plates of the sill beam at each moment was calculated.

[0036] Calculate the thermal restraint stress of the inner plate of the sill beam on the outer plate of the sill beam based on the thermal expansion strain of the outer plate and the inner plate of the sill beam.

[0037] Preferably, the quantitative assessment of whether the outer plate of the sill beam has undergone wrinkling deformation includes:

[0038] If the thermal restraint stress exceeds the yield strength of the raw material of the sill beam outer plate, it is determined that the sill beam outer plate is at risk of wrinkling and deformation.

[0039] If the thermal restraint stress does not exceed the yield strength of the raw material of the sill beam outer plate, it is determined that there is no risk of wrinkling or deformation of the sill beam outer plate.

[0040] Secondly, the present invention provides a simulation analysis device for wrinkle deformation of the outer plate of a threshold beam based on a coating and baking process, comprising:

[0041] At least one processor; and,

[0042] A memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, the instructions being executed by the processor for performing the simulation analysis method for the wrinkling deformation of the outer plate of the threshold beam based on the coating and baking process as described in the first aspect.

[0043] In view of the shortcomings of the prior art, the beneficial effects that the present invention can achieve are as follows:

[0044] This invention uses measured temperature data of the inner and outer panels of the sill beam to build a thermodynamic stress analysis simulation model for the coating and baking of the sill beam. This model effectively analyzes the influence of thermal restraint stress from the inner panel on the outer panel of the sill beam during the coating and baking process, and quantitatively assesses the risk of wrinkling and deformation of the outer panel of the sill beam.

[0045] Applying this invention to the early stages of vehicle development can effectively avoid the possibility of baking wrinkles and deformation of the sill beam outer panel, and avoid the risks of increased R&D costs and extended R&D cycles caused by changes in the sill beam outer panel features during the later stages of vehicle development, which could lead to conflicts with the external shape and the need for mold re-opening (or mold repair). Attached Figure Description

[0046] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments of the present invention will be briefly described below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0047] Figure 1 This is a flowchart illustrating a simulation analysis method for wrinkle deformation of the outer plate of a threshold beam based on a coating and baking process, provided in Embodiment 1 of the present invention.

[0048] Figure 2 This is a flowchart illustrating a simulation analysis method for wrinkle deformation of the outer plate of a threshold beam based on a coating and baking process, provided in Embodiment 1 of the present invention.

[0049] Figure 3 This is a schematic diagram of the measured temperature data obtained through a temperature sensor;

[0050] Figure 4 This is a flowchart illustrating a simulation analysis method for wrinkle deformation of the outer plate of a threshold beam based on a coating and baking process, provided in Embodiment 1 of the present invention.

[0051] Figure 5 This is a schematic diagram after removing noise data from the measured temperature data;

[0052] Figure 6 This is a schematic diagram showing the discretized temperature data curves of the outer and inner plates of the sill beam.

[0053] Figure 7 This is a flowchart illustrating a simulation analysis method for wrinkle deformation of the outer plate of a threshold beam based on a coating and baking process, provided in Embodiment 1 of the present invention.

[0054] Figure 8 It is a white body model drawing obtained by modeling the parts in the body CAD data;

[0055] Figure 9 This is a diagram illustrating the process of assigning values ​​to certain components in the vehicle body CAD data.

[0056] Figure 10 This is a flowchart illustrating a simulation analysis method for wrinkle deformation of the outer plate of a threshold beam based on a coating and baking process, provided in Embodiment 1 of the present invention.

[0057] Figure 11 This is a diagram illustrating the process of creating load modules for different temperature fields;

[0058] Figure 12 This is a flowchart illustrating a simulation analysis method for wrinkle deformation of the outer plate of a threshold beam based on a coating and baking process, provided in Embodiment 1 of the present invention.

[0059] Figure 13 Yes Figure 8 A schematic diagram showing the truss beam area after cutting the white body model;

[0060] Figure 14 This is a schematic diagram illustrating the process of constraining the cross-section of the body-in-white model;

[0061] Figure 15 This is a flowchart illustrating a simulation analysis method for wrinkle deformation of the outer plate of a threshold beam based on a coating and baking process, provided in Embodiment 1 of the present invention.

[0062] Figure 16 This is a schematic diagram of a simulation analysis device for wrinkle deformation of the outer plate of a threshold beam based on a coating and baking process, provided in Embodiment 2 of the present invention. Detailed Implementation

[0063] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. In addition, the technical features of the various embodiments or individual embodiments provided by the present invention can be arbitrarily combined with each other to form feasible technical solutions. Such combinations are not constrained by the order of steps and / or structural composition patterns, but must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0064] Example 1:

[0065] To address the technical problem that traditional methods cannot quantitatively analyze and assess the risk of wrinkling and deformation in the outer panel of a sill beam during the coating and baking process, this embodiment 1 provides a simulation analysis method for wrinkling and deformation of the outer panel of a sill beam based on the coating and baking process. Figure 1 As shown, including:

[0066] S100 acquires the measured temperature data of the outer and inner sill beams of the body-in-white of the base vehicle under painting and baking conditions, and processes the measured temperature data to ensure that the measured temperature data meets the simulation analysis requirements.

[0067] In this step, real and valid test data are obtained by placing one or more physical samples of the white body of a base vehicle in a painting and baking environment.

[0068] In specific implementation, the method involves obtaining measured temperature data of the outer and inner sill beams of the body-in-white of the base vehicle under painting and baking conditions, such as... Figure 2 As shown, including:

[0069] S111, temperature sensors are arranged in the flat area of ​​the body-in-white sill beam of the base vehicle.

[0070] The temperature sensor is a device used to sense temperature and convert it into an output signal. Depending on the actual needs, one or more temperature sensors can be arranged. In order to reduce the measurement error of the temperature sensor, the temperature sensor is preferably arranged in the flat area of ​​the door sill beam of the body-in-white of the base vehicle.

[0071] S112 uses a temperature sensor to measure the temperature of the outer and inner sill beams of the body-in-white of the base vehicle.

[0072] During the measurement process, the probe end of the temperature sensor is close to the door sill beam of the base vehicle's body-in-white, while the output end transmits the temperature signal to the PC in real time via wired or wireless means, and the PC processes the temperature signal.

[0073] like Figure 3 The diagram shows the measured temperature data obtained by the temperature sensor. The measured temperature data includes the heating and cooling process data within one cycle. In addition to the temperature data of the outer and inner panels of the sill beam, the measured temperature data also contains some noise data of varying degrees. If this noise data is not processed, it will increase the measurement error to some extent.

[0074] Furthermore, the measured temperature data is processed, such as... Figure 4 As shown, including:

[0075] S121, remove noise data from the measured temperature data to obtain smooth temperature data curves for the outer and inner panels of the sill beam.

[0076] like Figure 5 The diagram shown is a schematic of the measured temperature data after removing noise data. Only the smooth curves of the temperature data of the outer and inner plates of the sill beam are retained in the diagram, and all other noise data have been removed.

[0077] S122, the temperature data curves of the outer and inner plates of the sill beam are discretized into data points respectively.

[0078] like Figure 6 The diagram shows the discretized temperature data curves of the outer and inner panels of the door sill beam. The discretization process covers a complete cycle and can be performed at fixed or non-fixed time frequency intervals. The time frequency interval can be adjusted as needed; the smaller the time frequency interval, the denser the discretized data points, and the higher the corresponding accuracy. In actual implementation, it is preferable to perform discretization at a fixed time frequency interval, combined with the coating baking temperature environment, approximately every 1.5 hours.

[0079] S123, group the data points according to the time axis to ensure that each group of data points corresponds to a unique temperature value of the outer plate and inner plate of the sill beam at each moment.

[0080] That is, in the direction perpendicular to the time axis, in each set of data points, there is one and only one data point that corresponds to the temperature value of the outer plate of the sill beam, and at the same time, there is one and only one data point that corresponds to the temperature value of the inner plate of the sill beam.

[0081] S200: Obtain the vehicle body CAD data and vehicle body BOM information table, and build a finite element model for the sill beam baking thermodynamic analysis based on the vehicle body CAD data and vehicle body BOM information table.

[0082] The vehicle body CAD data includes, but is not limited to, engineering mechanical drawings of various components in 2D or 3D format. As a crucial part of building the finite element model for the thermodynamic analysis of the door sill beam, the vehicle body CAD data includes at least the vehicle body, weld points, and structural adhesives. The vehicle body BOM (Bill of Materials) information sheet is a document describing the structural components of the vehicle body. In actual implementation, both the vehicle body CAD data and the vehicle body BOM information sheet can be obtained from the R&D design department.

[0083] In specific implementation, the step of building a finite element model for the baking thermodynamic analysis of the sill beam based on the vehicle body CAD data and vehicle body BOM information table, such as... Figure 7 As shown, including:

[0084] S211, import the vehicle body CAD data into Hyperworks or Ansa software.

[0085] Currently, Hyperworks or Ansa software are the mainstream CAE (Computer Aided Engineering) software, with high simulation modeling efficiency.

[0086] S212, use Hyperworks or Ansa software to model the parts in the vehicle body CAD data to obtain the body-in-white model.

[0087] The vehicle body is modeled using 2D shell elements, the weld points are modeled using the acm(rbe3+chexa+rbe3) connection method, and the structural adhesive is modeled using the adhesives(rbe3+chexa+rbe3) connection method.

[0088] like Figure 8 The image shown is a white body model obtained by modeling the parts in the vehicle body CAD data.

[0089] S213, assign values ​​to the parts in the vehicle body CAD data based on the vehicle body BOM information table.

[0090] The process of assigning values ​​to the components in the vehicle body CAD data is the process of configuring the attributes of the components in the vehicle body CAD data. For example, assigning corresponding material types, dimensions, and thicknesses to the aforementioned components such as the vehicle body, weld points, and structural adhesives.

[0091] like Figure 9The diagram shows the process of assigning values ​​to some parts in the vehicle body CAD data.

[0092] S300, based on preprocessed measured temperature data and a finite element model of the sill beam baking thermodynamic analysis, creates load modules for different temperature fields on the outer and inner plates of the sill beam.

[0093] As one implementation method, the module for creating different temperature field loads on the outer and inner plates of the sill beam is as follows: Figure 10 As shown, it includes:

[0094] S311, acquire the grouped data points and preset the corresponding number of temperature load cards.

[0095] The number of temperature load cards is the same as the number of data point groups after grouping.

[0096] S312, sequentially set the temperature values ​​corresponding to the grouped data points into the temperature load card to obtain different temperature field load modules.

[0097] like Figure 11 The diagram shows the process of creating different temperature field load modules. The diagram uses a sample group of 50 data points as an example. The temperature value of the outer plate of the sill beam at the first time point (first temperature group) is denoted as `outer_load_t1`, and the temperature value of the inner plate of the sill beam is denoted as `inner_load_t1`. The temperature values ​​`outer_load_t1` and `inner_load_t1` of the outer plate and inner plate of the sill beam are set into the corresponding temperature load cards. This process is repeated, sequentially setting the temperature values ​​`outer_load_ti` of the outer plate and `inner_load_ti` of the inner plate of the sill beam at the i-th time point (i-th temperature group) into the corresponding temperature load cards, until the settings for `outer_load_t50` and `inner_load_t50` of the inner plate of the sill beam are completed. After setting and saving, the different temperature field load modules are created.

[0098] S400 creates a simulation analysis of the stress, wrinkling, and deformation of the outer panel of the sill beam under the painting and baking state, and calculates the thermal restraint stress from the inner panel of the sill beam on the outer panel of the sill beam under different temperature field load modules.

[0099] In this step, the simulation analysis of the stress-induced wrinkling and deformation of the outer plate of the sill beam under the coating and baking state is as follows: Figure 12 As shown, it includes:

[0100] S411, partially cut out the body-in-white model, retaining the outer and inner sill beam areas.

[0101] like Figure 13 As shown, it is for Figure 8 A schematic diagram of the white body model after slicing and retaining the sill beam area.

[0102] S412 constrains the cross-section of the body-in-white model.

[0103] After partially cutting out the body-in-white model, there will be a cut surface at the cut-out location. In order to reduce the impact of the cut surface on the simulation process, it is necessary to constrain the cut surface of the body-in-white model in advance.

[0104] like Figure 14 The diagram shows the process of constraining the cross-sections of the white body model. There are three cross-sections in the diagram, and all three cross-sections are constrained.

[0105] S413 applies different temperature field load modules to the outer and inner plate areas of the sill beam.

[0106] The loading process in this step is implemented based on the above S312.

[0107] In this step, the calculation of the outer plate of the sill beam under different temperature field load modules is performed on the thermal restraint stress from the inner plate of the sill beam, such as... Figure 15 As shown, including:

[0108] S421 calculates the thermal expansion strain of the outer and inner plates of the sill beam at each moment.

[0109] The calculation process is preferably performed using Abaqus software, and the specific calculation method is as follows:

[0110] ε=ΔL / L=|ΔT|×α

[0111] Where ε is the thermal expansion strain, ΔL is the thermal expansion strain, L is the original length of the sill beam, ΔT is the temperature difference between the outer and inner plates of the sill beam, and α is the thermal expansion coefficient of the sill beam.

[0112] S422, Calculate the thermal restraint stress of the inner plate of the sill beam on the outer plate of the sill beam based on the thermal expansion strain of the outer plate and the inner plate of the sill beam.

[0113] The specific calculation method for the thermal restraint stress of the inner plate of the sill beam on the outer plate of the sill beam is as follows:

[0114] σ=E×ε

[0115] Where σ is the thermal restraint stress and E is Young's modulus.

[0116] Young's modulus is a physical quantity that describes the resistance of a solid material to deformation. It measures the stiffness of an isotropic elastic body and is defined as the ratio between uniaxial stress and uniaxial deformation within the applicability of Hooke's law. It is a physical quantity characterizing the properties of a material and depends only on the material's intrinsic physical properties. Young's modulus is one of the bases for selecting materials for mechanical parts and is a commonly used parameter in engineering design. Methods for measuring Young's modulus generally include the tensile method, beam bending method, vibration method, and internal friction method.

[0117] It should be noted that the Young's modulus E used in the calculation method is preferably obtained from the product manual provided by the raw material manufacturer of the door sill beam, and the specific method of its measurement is not within the scope of this solution.

[0118] S500 compares the calculated thermal restraint stress on the outer panel of the sill beam with the yield strength of the raw material of the outer panel of the sill beam to quantitatively assess whether the outer panel of the sill beam has wrinkled or deformed.

[0119] The yield strength refers to the yield limit of the raw material of the sill beam outer plate when it yields. It is also the stress that the sill beam outer plate resists slight plastic deformation. Under the action of thermal restraint stress greater than the yield strength, the sill beam outer plate will undergo permanent deformation that cannot be recovered. Under the action of thermal restraint stress less than the yield strength, the sill beam outer plate will return to its original shape.

[0120] In this step, the quantitative assessment of whether the outer plate of the sill beam has undergone wrinkling deformation includes:

[0121] If the thermal restraint stress exceeds the yield strength of the raw material of the sill beam outer plate, the sill beam outer plate is deemed to have a risk of wrinkling deformation; if the thermal restraint stress does not exceed the yield strength of the raw material of the sill beam outer plate, the sill beam outer plate is deemed not to have a risk of wrinkling deformation.

[0122] This embodiment 1 provides a simulation analysis method for wrinkle deformation of the outer plate of the sill beam based on the coating and baking process. It establishes a simulation analysis model for wrinkle deformation of the outer plate of the sill beam using measured temperature data. The simulation model is used to assess the risk of wrinkle deformation of the outer plate of the sill beam, which fills the technical problem that traditional methods cannot quantitatively analyze and assess whether there is a risk of wrinkle deformation of the outer plate of the sill beam under the coating and baking state. It can identify and avoid the risk of wrinkle deformation of the outer plate of the sill beam under the coating and baking state in advance.

[0123] Example 2:

[0124] Based on the same overall technical solution as in Embodiment 1, such as Figure 16The diagram shown is a structural schematic of a sill beam outer plate wrinkle deformation simulation analysis device based on a coating and baking process provided in Embodiment 2. It includes: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, which are executed by the processor to perform the sill beam outer plate wrinkle deformation simulation analysis method based on a coating and baking process as described in Embodiment 1.

[0125] In summary, this invention provides a simulation analysis method and apparatus for wrinkle deformation of the outer panel of a door sill beam based on the painting and baking process. By using measured temperature data of the inner and outer panels of the door sill beam, a thermodynamic stress analysis simulation model for the painting and baking of the door sill beam is built. This model effectively analyzes the influence of thermal restraint stress from the inner panel of the door sill beam on the outer panel during the painting and baking process, and quantitatively assesses the risk of wrinkle deformation in the outer panel. Applying this invention to the early stages of vehicle development can effectively avoid the possibility of wrinkle deformation in the outer panel of the door sill beam during baking. It also avoids the risks of increased R&D costs and extended development cycles caused by changes in the outer panel features during the later stages of vehicle development, such as conflicts with the exterior styling and the need for mold re-opening (or repair).

[0126] It should be noted that the descriptions of each embodiment in the above embodiments have different focuses. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0127] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, electronic devices, or computer software program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0128] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, systems, electronic devices, or computer software program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A system that specifies functions in one or more boxes.

[0129] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including an instruction set implemented in a process. Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0130] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0131] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

Claims

1. A simulation analysis method for wrinkle deformation of the outer plate of a threshold beam based on a coating and baking process, characterized in that, include: The measured temperature data of the outer and inner sill beams of the body-in-white of the base vehicle under the painting and baking state are obtained. The measured temperature data is processed to make the measured temperature data meet the simulation analysis requirements. Noise data in the measured temperature data is removed to obtain smooth temperature data curves of the outer and inner sill beams. The temperature data curves of the outer and inner plates of the sill beam are discretized into data points. Based on the time axis, the data points are grouped to ensure that each group of data points corresponds to a unique temperature value for the outer and inner plates of the sill beam at each moment. Obtain the vehicle body CAD data and vehicle body BOM information table; build a finite element model for the sill beam baking thermodynamic analysis based on the vehicle body CAD data and vehicle body BOM information table; import the vehicle body CAD data into Hyperworks software or Ansa software; The body-in-white model is obtained by modeling the parts in the body CAD data using Hyperworks or Ansa software. Based on the vehicle body BOM information table, values ​​are assigned to the components in the vehicle body CAD data; the components in the CAD data include the vehicle body, weld points, and structural adhesives; Based on the preprocessed measured temperature data and the constructed finite element model of the sill beam baking thermodynamic analysis, load modules for different temperature fields of the outer and inner plates of the sill beam are created; grouped data points are obtained, and a corresponding number of temperature load cards are preset. The temperature values ​​corresponding to the grouped data points are sequentially set into the temperature load cards to obtain different temperature field load modules. A simulation analysis of the stress-induced wrinkling and deformation of the outer plate of the sill beam under the coating and baking state was created, and the thermal restraint stress from the inner plate of the sill beam was calculated under different temperature field load modules. The body-in-white model is partially cropped, retaining the outer and inner panels of the sill beam; Constrain the cross-section of the body-in-white model; Different temperature field load modules are applied to the outer and inner plate areas of the sill beam; The thermal expansion strain of the outer and inner plates of the sill beam at each moment was calculated. Calculate the thermal restraint stress of the inner plate of the sill beam on the outer plate of the sill beam based on the thermal expansion strain of the outer plate and the inner plate of the sill beam. The calculated thermal restraint stress on the outer plate of the sill beam is compared with the yield strength of the raw material of the outer plate of the sill beam to quantitatively assess whether the outer plate of the sill beam has wrinkled or deformed.

2. The simulation analysis method for wrinkle deformation of the outer plate of a threshold beam based on coating and baking process according to claim 1, characterized in that, The acquisition of measured temperature data for the outer and inner sill beams of the body-in-white of the base vehicle under painting and baking conditions includes: Temperature sensors are placed in the flat area of ​​the door sill beam of the body-in-white of the base vehicle. Temperatures were measured on the outer and inner sill beams of the body-in-white of the base vehicle using temperature sensors.

3. The simulation analysis method for wrinkle deformation of the outer plate of a threshold beam based on coating and baking process according to claim 1, characterized in that, The quantitative assessment of whether the outer plate of the threshold beam has wrinkled or deformed includes: If the thermal restraint stress exceeds the yield strength of the raw material of the sill beam outer plate, it is determined that the sill beam outer plate is at risk of wrinkling and deformation. If the thermal restraint stress does not exceed the yield strength of the raw material of the sill beam outer plate, it is determined that there is no risk of wrinkling or deformation of the sill beam outer plate.

4. A simulation analysis device for wrinkle deformation of the outer plate of a threshold beam based on a coating and baking process, characterized in that, include: At least one processor; as well as, A memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, the instructions being executed by the processor for performing the simulation analysis method for the wrinkling deformation of the outer plate of the threshold beam based on the coating and baking process as described in any one of claims 1-3.

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