Method for determining the cross-sectional size of a complex large-section titanium alloy extruded profile

Abstract

This invention discloses a method for determining the cross-sectional dimensions of complex large-section titanium alloy extruded profiles. By acquiring and processing the cross-sectional profile of the target part through reverse design and proportional scaling, an initial profile blank cross-sectional shape is obtained. Extrusion analysis is performed using a titanium alloy profile extrusion simulation model to obtain the current cross-sectional shape's joint relationship information. If the part's design requirements are met, the initial profile blank cross-sectional shape is analyzed using a hot-bending creep constitutive simulation model and a titanium alloy profile milling simulation model. Based on the determined hot-bending geometric model and milling geometric model of the current cross-sectional shape, the target titanium alloy extruded profile cross-sectional dimensions are determined. This method solves the problems of uneven cross-sectional mechanical properties caused by relying on trial and error to determine the profile cross-section during extrusion, and the resulting deformation differences between forming and milling processes. It improves the accuracy of cross-sectional shape design and the efficiency of part development.

Description

Technical Field

[0001] This invention relates to the field of titanium alloy forming and processing technology, and in particular to a method for determining the cross-sectional dimensions of complex large-section titanium alloy extruded profiles. Background Technology

[0002] To achieve high service performance and long service life, the new generation of wide-body civil aircraft adopts a large number of carbon fiber reinforced composite material integral structures. Due to the high specific strength and corrosion resistance of titanium alloys, they exhibit good compatibility with composite material integral structures during assembly and can also serve a reinforcing role. Furthermore, to improve the overall rigidity and strength of the fuselage structure, increasingly complex cross-section titanium alloy curved surface components are being used to replace traditional aluminum alloys in the structures of cabin doors, fuselage, and wing-fuselage joints. Currently, these components typically undergo three main process flows: extrusion of complex large-section titanium alloy profiles for billet preparation, hot-drawing and creep forming for bending, and high-efficiency CNC milling for manufacturing the finished parts.

[0003] Since the entire manufacturing process of complex cross-section titanium alloy curved surface components involves extrusion, bending and milling processes, the cross-sectional shape and size directly determine the manufacturing accuracy of each process and the service performance of the finished part. Therefore, the control method is crucial to whether the component is qualified.

[0004] In the process of realizing this invention, the inventors discovered the following defects in the prior art: Currently, in order to develop titanium alloy curved surface components for civil aircraft, the current extrusion process relies on human trial and error to determine the profile cross-section, or only on the design and control of process parameters for a single manufacturing stage. This results in uneven mechanical properties of the cross-section during the extrusion process and poor deformation in subsequent forming and milling. Furthermore, due to the excessive allowance reserved during part manufacturing and inaccurate cross-sectional shape design, the part manufacturing cost is high, the part development efficiency is low, and the mechanical performance and geometric accuracy design and usage requirements cannot be met. Summary of the Invention

[0005] This invention provides a method for determining the cross-sectional dimensions of complex large-section titanium alloy extruded profiles, so as to improve the accuracy of cross-sectional shape design and the efficiency of part manufacturing.

[0006] According to one aspect of the present invention, a method for determining the cross-sectional dimensions of complex large-section titanium alloy extruded profiles is provided, comprising: The initial profile blank cross-sectional shape is obtained by processing the target part cross-sectional profile through a preset reverse design and proportional enlargement method. By using a pre-established titanium alloy profile extrusion simulation model, the initial profile blank cross-sectional shape is subjected to extrusion analysis to obtain the current cross-sectional shape joint relationship information; Among them, the current cross-sectional shape joint relationship information includes strain data of the current cross-sectional shape, and the descriptive relationship between mechanical properties and grain size; If the mechanical properties of the current cross-sectional shape meet the preset part design requirements, the initial profile blank cross-sectional shape is analyzed and calculated using the preset thermal bending creep constitutive simulation model to obtain the current residual stress field and the thermal bending geometric model of the current cross-sectional shape. A simulation model for milling titanium alloy profiles is established based on the current cross-sectional shape thermal bending geometric model, and a milling process analysis is performed in conjunction with the current residual stress field to obtain the current cross-sectional shape milling process geometric model. The cross-sectional dimensions of the target titanium alloy extruded profile are determined based on the current cross-sectional shape hot bending geometry model and the current cross-sectional shape milling geometry model.

[0007] According to another aspect of the present invention, a device for determining the cross-sectional dimensions of complex large-section titanium alloy extruded profiles is provided, comprising: The initial profile blank cross-sectional shape determination module is used to obtain and process the target part's cross-sectional profile through a preset reverse design and proportional enlargement method to obtain the initial profile blank cross-sectional shape. The current cross-sectional shape joint relationship information determination module is used to perform extrusion analysis on the initial profile blank cross-sectional shape through a pre-established titanium alloy profile extrusion simulation model to obtain the current cross-sectional shape joint relationship information; Among them, the current cross-sectional shape joint relationship information includes strain data of the current cross-sectional shape, and the descriptive relationship between mechanical properties and grain size; The module for determining the current residual stress field and the current cross-sectional shape thermal bending geometric model is used to analyze and calculate the initial profile blank cross-sectional shape through a preset thermal bending creep constitutive simulation model if the mechanical properties of the current cross-sectional shape meet the preset part design requirements, so as to obtain the current residual stress field and the current cross-sectional shape thermal bending geometric model. The current cross-sectional shape milling machining geometry model determination module is used to establish a titanium alloy profile milling simulation model based on the current cross-sectional shape hot bending geometry model, and to perform milling machining analysis in combination with the current residual stress field to obtain the current cross-sectional shape milling machining geometry model; The target titanium alloy extruded profile cross-sectional dimension determination module is used to determine the target titanium alloy extruded profile cross-sectional dimension based on the current cross-sectional shape hot bending geometry model and the current cross-sectional shape milling geometry model.

[0008] According to another aspect of the present invention, an electronic 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 implement the method for determining the cross-sectional dimensions of complex large-section titanium alloy extruded profiles as described in any embodiment of the present invention.

[0009] According to another aspect of the present invention, a computer-readable storage medium is provided, the computer-readable storage medium storing computer instructions for causing a processor to execute and implement the method for determining the cross-sectional dimensions of complex large-section titanium alloy extruded profiles as described in any embodiment of the present invention.

[0010] The technical solution of this invention involves obtaining and processing the cross-sectional profile of the target part using a preset reverse design and proportional scaling method to obtain the initial profile blank cross-sectional shape; performing extrusion analysis on the initial profile blank cross-sectional shape using a pre-established titanium alloy profile extrusion simulation model to obtain the current cross-sectional shape joint relationship information; if the mechanical properties of the current cross-sectional shape meet the preset part design and usage requirements, then analyzing and calculating the initial profile blank cross-sectional shape using a preset hot-bending creep constitutive simulation model to obtain the current residual stress field and the current cross-sectional shape hot-bending geometric model; establishing a titanium alloy profile milling simulation model based on the current cross-sectional shape hot-bending geometric model, and performing milling analysis in conjunction with the current residual stress field to obtain the current cross-sectional shape milling geometric model; and determining the target titanium alloy extruded profile cross-sectional dimensions based on the current cross-sectional shape hot-bending geometric model and the current cross-sectional shape milling geometric model. It solves the problems of uneven mechanical properties of the profile caused by relying on human trial and error to determine the profile cross-section during the extrusion process, and the deformation difference in forming and milling caused by determining the cross-section only for the process parameters of a single manufacturing stage. It improves the accuracy of cross-section shape design and the efficiency of part development, and meets the design and usage requirements of mechanical properties and geometric accuracy.

[0011] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1aThis is a flowchart of a method for determining the cross-sectional dimensions of a complex large-section titanium alloy extruded profile according to Embodiment 1 of the present invention; Figure 1b This is a structural schematic diagram of the enlarged cross-sectional profile of a part in the method provided according to Embodiment 1 of the present invention; Figure 1c This is a schematic diagram of the structure in the method provided by Embodiment 1 of the present invention, showing the mechanical properties and grain size of different cross-sectional regions with different cross-sectional shapes; Figure 1d This is a schematic diagram of the strain field distribution law obtained by extrusion simulation in the method provided in Embodiment 1 of the present invention; Figure 1e This is a schematic diagram illustrating the relationship between strain data, mechanical properties, and grain size of the current cross-sectional shape in the method provided according to Embodiment 1 of the present invention. Figure 1f This is a schematic diagram of the simulation of thermal bending creep and milling process in the method provided in Embodiment 1 of the present invention; Figure 1g This is a schematic diagram of the structure of the milling geometry model for determining the current cross-sectional shape in the method provided in Embodiment 1 of the present invention; Figure 2 This is a detailed flowchart of a method for determining the cross-sectional dimensions of a complex large-section titanium alloy extruded profile according to Embodiment 2 of the present invention; Figure 3 This is a schematic diagram of a device for determining the cross-sectional dimensions of a complex large-section titanium alloy extruded profile according to Embodiment 3 of the present invention; Figure 4 This is a schematic diagram of the structure of an electronic device provided according to Embodiment 4 of the present invention. Detailed Implementation

[0014] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0015] It should be noted that the terms "target," "current," etc., used in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0016] It is worth noting that the information collected in the technical solution of this application is information and data authorized by the user or fully authorized by all parties, and the collection, storage, use, processing, transmission, provision, disclosure and application of the relevant data all comply with the relevant laws, regulations and standards of the relevant countries and regions, take necessary confidentiality measures, do not violate public order and good morals, and provide corresponding operation entry points for users to choose to authorize or refuse; if the user chooses to refuse, the process will proceed to the expert decision-making process.

[0017] Example 1 Figure 1a The flowchart of the method for determining the cross-sectional dimensions of complex large-section titanium alloy extruded profiles provided in Embodiment 1 of the present invention is applicable to the scenario of determining the cross-sectional dimensions of complex large-section titanium alloy extruded profiles. The method can be executed by a device for determining the cross-sectional dimensions of complex large-section titanium alloy extruded profiles, which can be implemented in hardware and / or software.

[0018] Correspondingly, such as Figure 1a As shown, the method includes: S110. Obtain the cross-sectional profile of the target part and process it using a preset reverse design and proportional enlargement method to obtain the initial profile blank cross-sectional shape.

[0019] The target part's cross-sectional profile can be the design standard for the final part's cross-sectional profile. The proportional enlargement method can be a method of enlarging the cross-sectional thickness by a factor of two. The initial profile blank's cross-sectional shape can be the cross-sectional shape after proportional enlargement.

[0020] Optionally, the step of obtaining and processing the target part's cross-sectional profile using a preset reverse design and proportional enlargement method to obtain the initial profile blank cross-sectional shape includes: obtaining the target part's cross-sectional profile and obtaining part process feature description information; wherein, the part process feature description information includes at least one of the following: geometric features of hot-drawing bending process, geometric features of milling process, and target part wall thickness; based on the part process feature description information, the cross-sectional thickness corresponding to the target part's cross-sectional profile is proportionally enlarged according to a preset first ratio using the reverse design and proportional enlargement method to obtain the initial profile blank cross-sectional shape.

[0021] The first ratio can be a specific magnification factor.

[0022] In this embodiment, the initial profile blank cross-sectional shape needs to be determined through reverse design. The reverse design needs to consider the geometric features of the hot drawing bending process, the geometric features of the milling process, and the wall thickness of the target part, and perform corresponding proportional scaling processing.

[0023] Specifically, such as Figure 1b The image shown is a scaled-up schematic diagram of the part's cross-sectional profile. Figure 1b The first image on the left shows the cross-sectional profile of the target part. The initial wall thickness of the extruded profile can be scaled based on the geometric features of the hot-draw bending and milling processes, or according to the final target part's wall thickness variation; for example, the cross-sectional thickness can be proportionally enlarged 2 to 15 times outwards from the profile. Figure 1b In the diagram, the second image from the left shows a schematic diagram with the cross-sectional thickness magnified by 2 times, the third image from the left shows a schematic diagram with the cross-sectional thickness magnified by 4 times, and the fourth image from the left shows a schematic diagram with the cross-sectional thickness magnified by 10 times.

[0024] S120. Using a pre-established titanium alloy profile extrusion simulation model, the initial profile blank cross-sectional shape is subjected to extrusion analysis to obtain the current cross-sectional shape joint relationship information.

[0025] The current cross-sectional shape joint relationship information includes strain data of the current cross-sectional shape, and the descriptive relationship between mechanical properties and grain size.

[0026] The titanium alloy profile extrusion simulation model can be a model for simulating the extrusion of titanium alloy profiles using an extrusion die, and this model can be built based on Deform. The current cross-sectional shape joint relationship information can describe the relationship between strain data, mechanical properties, and grain size corresponding to the current cross-sectional shape.

[0027] Optionally, the step of performing extrusion analysis on the cross-sectional shape of the initial profile blank using a pre-established titanium alloy profile extrusion simulation model to obtain the current cross-sectional shape joint relationship information includes: designing the current extrusion die based on the cross-sectional shape of the initial profile blank, and performing feature division on the cross-sectional shape of the initial profile blank to obtain at least one divided cross-sectional region; obtaining macroscopic mechanical property data and microstructure data corresponding to each divided cross-sectional region through a preset region analysis method; wherein, the macroscopic mechanical property data includes at least one of the following: yield strength and tensile strength; the microstructure data includes average grain size; performing extrusion simulation on the current extrusion die using the preset titanium alloy profile extrusion simulation model to obtain strain data and the average dislocation density of the cross-section after extrusion; and establishing a descriptive relationship between the strain data, mechanical properties, and grain size of the current cross-sectional shape based on the strain data, yield strength, tensile strength, and average grain size.

[0028] In this embodiment, the cross-sectional shape of the initial profile blank can be characterized by segmentation to obtain multiple segmented cross-sectional regions. Then, samples are taken from different regions for room temperature tensile testing and metallographic analysis to obtain the yield strength, tensile strength, and average grain size of different regions.

[0029] Furthermore, each region needs to be analyzed using region analysis methods to obtain the macroscopic mechanical property data and microstructure data corresponding to each divided cross-sectional region. Specifically, the macroscopic mechanical property data includes yield strength and tensile strength; the microstructure data includes average grain size.

[0030] like Figure 1c The diagram shows the structural schematics illustrating the relationship between the mechanical properties and grain size of different cross-sectional regions with varying cross-sectional shapes. Figure 1c The initial profile blank cross-sectional shape is divided into five regions. The figure on the right shows the yield strength and corresponding grain size of each region.

[0031] Correspondingly, the current extrusion die can be simulated using a titanium alloy profile extrusion simulation model to obtain strain data and the average dislocation density of the cross-section after extrusion. Based on the strain data, yield strength, tensile strength, and average grain size, a descriptive relationship between the strain data, mechanical properties, and grain size of the current cross-sectional shape can be established.

[0032] Specifically, based on the extrusion test conditions and parameters, a simulation model of titanium alloy profile extrusion was established to analyze and obtain the strain field distribution law on the cross-section during the extrusion process. For example... Figure 1d The image shown is a schematic diagram illustrating the strain field distribution obtained from extrusion simulation. Figure 1d The numbers in the figure are contour lines representing the extrusion strain values ​​on the profile cross-section obtained by simulating the extrusion process using Deform software.

[0033] In detail, the heating temperature of the billet in the extrusion process of complex large-section titanium alloy profiles is 0 to 200℃ above the β-phase transformation point, the extrusion speed is 50 to 200 mm / s, the die entry angle is 0 to 45°, and the die sizing zone length is 5 to 15 mm. Samples are taken from different locations on the profile cross-section for room temperature tensile tests and metallographic characterization experiments to obtain macroscopic mechanical properties and microstructure data. Combining simulation and experimental data, a descriptive relationship between strain data, mechanical properties, and grain size for the current cross-sectional shape is established. For example... Figure 1e The diagram shown illustrates the relationship between strain data, mechanical properties, and grain size for the current cross-sectional shape. Figure 1e The strain magnitude in the figure represents strain data, while the yield stress describes mechanical properties.

[0034] S130. If the mechanical properties of the current cross-section shape meet the preset part design requirements, the initial profile blank cross-section shape is analyzed and calculated using the preset thermal bending creep constitutive simulation model to obtain the current residual stress field and the thermal bending geometric model of the current cross-section shape.

[0035] The thermal bending creep constitutive simulation model can be a model built based on ABAQUS, performing tensile bending and creep simulation. The current residual stress field can be the residual stress after tensile bending and creep treatment. The current cross-sectional shape thermal bending geometry model can be the cross-sectional geometry after the thermal bending creep constitutive simulation model is completed.

[0036] Specifically, if the mechanical properties of the current cross-sectional shape meet the preset part design requirements, the initial profile blank cross-sectional shape is analyzed and calculated using a preset thermal bending creep constitutive simulation model to obtain the current residual stress field and the current cross-sectional shape thermal bending geometric model. This includes: determining whether the mechanical properties of the divided cross-sectional regions meet the preset part design requirements; if not, the cross-sectional thickness of the initial profile blank cross-sectional shape is proportionally reduced according to a second ratio, and the process returns to execute the extrusion analysis of the initial profile blank cross-sectional shape using a pre-established titanium alloy profile extrusion simulation model to obtain the current cross-sectional shape joint relationship information; wherein, the second ratio is less than the first ratio; if satisfied, the initial profile blank cross-sectional shape is analyzed and calculated using a preset thermal bending creep constitutive simulation model to obtain the current residual stress field and the current cross-sectional shape thermal bending geometric model.

[0037] In this embodiment, it is first necessary to determine whether the mechanical properties of the divided cross-sectional regions meet the design requirements of the part, and also whether the microstructure data meets the design requirements. If not, it indicates that the current initial profile blank cross-sectional shape is magnified too much. Therefore, it is necessary to proportionally reduce the cross-sectional thickness of the initial profile blank cross-sectional shape according to the second ratio. Here, the second ratio is smaller than the first ratio; that is, assuming the first ratio is magnified by 10 times, the second ratio is reduced by no more than 10 times. This yields a new initial profile blank cross-sectional shape. Therefore, it is necessary to return to the operation of performing extrusion analysis on the initial profile blank cross-sectional shape using the pre-established titanium alloy profile extrusion simulation model to obtain the current cross-sectional shape joint relationship information.

[0038] Assuming that the design and usage requirements of the part are met, the initial profile blank cross-sectional shape can be analyzed and calculated using a thermal bending creep constitutive simulation model to obtain the current residual stress field and the thermal bending geometric model of the current cross-sectional shape.

[0039] S140. Based on the current cross-sectional shape thermal bending geometric model, establish a milling simulation model for titanium alloy profiles, and combine it with the current residual stress field to perform milling analysis, thereby obtaining the current cross-sectional shape milling geometric model.

[0040] Among them, the simulation model for milling titanium alloy profiles can be a model based on residual stress field analysis of milling and removal of redundant mesh from the blank, which can obtain the current cross-sectional shape milling geometric model.

[0041] Optionally, the step of establishing a titanium alloy profile milling simulation model based on the current cross-sectional shape thermal bending geometric model and performing milling analysis in conjunction with the current residual stress field to obtain the current cross-sectional shape milling geometric model includes: establishing a titanium alloy profile milling simulation model based on the current cross-sectional shape thermal bending geometric model; using the field transfer function of ABAQUS to transfer the current residual stress field to the titanium alloy profile milling simulation model; and removing redundant meshes on the blank by milling to obtain the current cross-sectional shape milling geometric model.

[0042] In this embodiment, a milling simulation model for titanium alloy profiles can be established based on the current cross-sectional shape thermal bending geometry model. The milling process simulation model is created using the element birth and death method, and the field transfer function of ABAQUS is utilized to use the current residual stress field transferred in the simulation as the initial stress field for the milling simulation. Excess meshes in the blank are removed according to roughing, semi-finishing, and finishing methods to obtain the current cross-sectional shape milling geometry model. Figure 1f The diagram shown is a structural schematic of the simulation of hot-stretch bending creep and milling processes. The top diagram is the simulation diagram of the hot-stretch bending creep forming process, and the bottom diagram is the simulation diagram of the milling process. Figure 1gAs shown, this is a schematic diagram of the structure of the milling geometry model to determine the current cross-sectional shape. Figure 1g In the process, the current cross-sectional shape milling geometry model is generated through two roughing operations, one semi-finishing operation, and one finishing operation.

[0043] The advantage of this setup is that by combining simulation and experimental methods, the entire process of titanium alloy profile extrusion simulation, hot bending creep, and profile milling can be carried out to achieve efficient optimization of profile cross-sectional dimensions, reduce manufacturing costs and development cycles in the development of titanium alloy curved surface components, and achieve synergistic optimization of component dimensions and performance.

[0044] S150. Determine the cross-sectional dimensions of the target titanium alloy extruded profile based on the current cross-sectional shape hot bending geometry model and the current cross-sectional shape milling geometry model.

[0045] The cross-sectional dimensions of the target titanium alloy extruded profile can be the cross-sectional dimensions corresponding to the cross-sectional contour of the target part.

[0046] Specifically, determining the cross-sectional dimensions of the target titanium alloy extruded profile based on the current cross-sectional shape hot-bending geometric model and the current cross-sectional shape milling geometric model includes: if the current cross-sectional shape milling geometric model does not exceed the contour envelope of the current cross-sectional shape hot-bending geometric model, then the cross-sectional dimensions of the target titanium alloy extruded profile are determined based on the current cross-sectional shape milling geometric model; if the current cross-sectional shape milling geometric model exceeds the contour envelope of the current cross-sectional shape hot-bending geometric model, then the process of obtaining and processing the initial profile blank cross-sectional shape based on the target part cross-sectional contour using a preset reverse design and proportional scaling method is returned.

[0047] In this embodiment, it is necessary to determine whether the current cross-sectional shape milling geometry model is within the contour envelope of the current cross-sectional shape hot-bending geometry model. If it is, it indicates that the processing requirements are met, and the cross-sectional dimensions of the target titanium alloy extruded profile can be determined. If it is not within the contour envelope of the current cross-sectional shape hot-bending geometry model, it indicates that the generated geometry model does not meet the process requirements. Therefore, it is necessary to return to the operation of obtaining and processing the initial profile blank cross-sectional shape according to the target part's cross-sectional contour through a preset reverse design and proportional scaling method.

[0048] The technical solution of this invention involves acquiring and processing the cross-sectional profile of the target part using a preset reverse design and proportional scaling method to obtain the initial profile blank cross-sectional shape; performing extrusion analysis on the initial profile blank cross-sectional shape using a pre-established titanium alloy profile extrusion simulation model to obtain the current cross-sectional shape joint relationship information; if the mechanical properties of the current cross-sectional shape meet the preset part design and usage requirements, then analyzing and calculating the initial profile blank cross-sectional shape using a preset hot-bending creep constitutive simulation model to obtain the current residual stress field and the current cross-sectional shape hot-bending geometric model; establishing a titanium alloy profile milling simulation model based on the current cross-sectional shape hot-bending geometric model, and performing milling analysis in conjunction with the current residual stress field to obtain the current cross-sectional shape milling geometric model; and determining the target titanium alloy extruded profile cross-sectional dimensions based on the current cross-sectional shape hot-bending geometric model and the current cross-sectional shape milling geometric model. This invention solves the problems of uneven mechanical properties caused by relying on human trial and error to determine the profile cross-section during the extrusion process, and the deformation differences caused by determining the cross-section based only on the process parameters of a single manufacturing stage. It improves the accuracy of cross-section shape design and the efficiency of part development, meeting the requirements of mechanical performance, geometric accuracy design and use. The efficient optimization of profile cross-section dimensions reduces the manufacturing cost and development cycle in the development of titanium alloy curved surface components, and achieves synergistic optimization of component size and performance.

[0049] Example 2 Figure 2 This document provides a detailed flowchart of a method for determining the cross-sectional dimensions of complex large-section titanium alloy extruded profiles, as described in Embodiment 2 of the present invention. This embodiment refines the above embodiment by further refining the process of analyzing and calculating the initial profile blank cross-sectional shape using a preset hot-bending creep constitutive simulation model to obtain the current residual stress field and the current cross-sectional shape hot-bending geometric model.

[0050] S210. Obtain the cross-sectional profile of the target part and process it using a preset reverse design and proportional enlargement method to obtain the initial profile blank cross-sectional shape.

[0051] S220. Using a pre-established titanium alloy profile extrusion simulation model, the initial profile blank cross-sectional shape is subjected to extrusion analysis to obtain the current cross-sectional shape joint relationship information.

[0052] The current cross-sectional shape joint relationship information includes strain data of the current cross-sectional shape, and the descriptive relationship between mechanical properties and grain size.

[0053] S230. If the mechanical properties of the current cross-sectional shape meet the preset part design requirements, then by formula... The average misalignment density is calculated using this method.

[0054] in, Both b and are material constants; For cross-sectional strain; This represents the average dislocation density.

[0055] S240. Based on the average dislocation density and the average grain size, the current tensile bending deformation stress, the current normalized dislocation rate, the current normalized average grain size ratio, and the current plastic strain are obtained by calculating the tensile bending sub-model corresponding to the thermal bending creep constitutive simulation model.

[0056] The thermal bending creep constitutive simulation model is constructed based on ABAQUS.

[0057] The hot-bending creep constitutive simulation model uses a bending temperature of 650–750℃, a bending speed of 0.001–0.01 rad / s, and a creep time of 20–40 min after deformation. A hot-bending creep constitutive simulation model is established based on the geometric parameters of the titanium alloy profile blank. The residual stress field after springback and the current cross-sectional shape of the hot-bending geometric model are calculated and obtained. The normalized average grain size of the cross-section can be statistically determined through metallographic experiments.

[0058] Specifically, the deformation stress during tensile bending corresponding to the tensile bending sub-model can be expressed as: Where E is the elastic modulus, and These represent the total strain and plastic strain generated by the loading process, respectively.

[0059] The current plastic strain rate is: ,in, , and It is a material constant. This represents the initial yield stress. This is the hardening stress. Among them, , For material constants, For the enhancement coefficient, To normalize the average grain size, This represents the current normalized dislocation density, which is the dislocation density after dimensionless processing of the average dislocation density. Specifically, the normalized dislocation rate is expressed as: In the formula, , , and These are material constants related to the tensile and bending stages. This represents the average dislocation density after extrusion. The current normalized average grain size is: ,in, , , , and It is a material constant. This represents the average grain size after extrusion.

[0060] S250. The current tensile bending deformation stress, current normalized misalignment rate, current normalized average grain size ratio and current plastic strain are used as initial variables for the creep process, and the current creep strain rate, the current residual stress field after creep and the current cross-sectional shape of the thermal bending geometric model are calculated by combining the creep sub-model corresponding to the thermal bending creep constitutive simulation model.

[0061] In this embodiment, the parameters obtained above can be used as initial variables for the creep process, and then combined with the creep sub-model for calculation. Specifically, the stress during creep deformation can be expressed as: ,in, The current creep strain rate can be expressed as: ,in, and It is a material constant. It is the exponential coefficient. It is the threshold stress. It is the apparent activation energy.

[0062] Since the creep stage directly inherits the microstructure evolution results from the stretching and bending stage, the dislocation density formula is: ,in, , It is a material constant. and This is a material constant. The grain evolution rate during creep also needs to consider the pre-strain level, which can be expressed by the formula: , It is the current plastic strain rate transmitted during the tensile bending stage. , , , and It is a material constant.

[0063] The advantage of this setup is that by using the hot-stretching and creep processing technology, different parameters corresponding to tensile bending and creep can be calculated respectively. This allows for the accurate hot-stretching and bending geometric model of the current cross-sectional shape, which provides a guarantee for the efficient optimization of profile cross-sectional dimensions and the efficiency of parts development.

[0064] S260. Based on the current cross-sectional shape thermal bending geometric model, establish a milling simulation model for titanium alloy profiles, and combine it with the current residual stress field to perform milling analysis, thereby obtaining the current cross-sectional shape milling geometric model.

[0065] S270. Determine the cross-sectional dimensions of the target titanium alloy extruded profile based on the current cross-sectional shape hot bending geometry model and the current cross-sectional shape milling geometry model.

[0066] The technical solution of this invention involves acquiring and processing the cross-sectional profile of the target part using a preset reverse design and proportional scaling method to obtain the initial profile blank cross-sectional shape; performing extrusion analysis on the initial profile blank cross-sectional shape using a pre-established titanium alloy profile extrusion simulation model to obtain the current cross-sectional shape joint relationship information; if the mechanical properties of the current cross-sectional shape meet the preset part design and usage requirements, then analyzing and calculating the initial profile blank cross-sectional shape using a preset hot-bending creep constitutive simulation model to obtain the current residual stress field and the current cross-sectional shape hot-bending geometric model; establishing a titanium alloy profile milling simulation model based on the current cross-sectional shape hot-bending geometric model, and performing milling analysis in conjunction with the current residual stress field to obtain the current cross-sectional shape milling geometric model; and determining the target titanium alloy extruded profile cross-sectional dimensions based on the current cross-sectional shape hot-bending geometric model and the current cross-sectional shape milling geometric model. It improves the accuracy of cross-sectional shape design and the efficiency of part development, meeting the requirements of mechanical performance and geometric accuracy design and use; the efficient optimization of profile cross-sectional dimensions reduces the manufacturing cost and development cycle in the development of titanium alloy curved surface components, and achieves synergistic optimization of component size and performance.

[0067] Example 3 Figure 3 This is a schematic diagram of a device for determining the cross-sectional dimensions of a complex large-section titanium alloy extruded profile, provided in Embodiment 2 of the present invention. The device for determining the cross-sectional dimensions of a complex large-section titanium alloy extruded profile provided in this embodiment can be implemented through software and / or hardware, and can be configured in a terminal device or server to implement a method for determining the cross-sectional dimensions of a complex large-section titanium alloy extruded profile according to an embodiment of the present invention. Figure 3 As shown, the device includes: an initial profile blank cross-sectional shape determination module 310, a current cross-sectional shape joint relationship information determination module 320, a current residual stress field and current cross-sectional shape hot bending geometric model determination module 330, a current cross-sectional shape milling machining geometric model determination module 340, and a target titanium alloy extruded profile cross-sectional size determination module 350.

[0068] The initial profile blank cross-sectional shape determination module 310 is used to obtain and process the cross-sectional profile of the target part through a preset reverse design and proportional enlargement method to obtain the initial profile blank cross-sectional shape. The current cross-sectional shape joint relationship information determination module 320 is used to perform extrusion analysis on the initial profile blank cross-sectional shape through a pre-established titanium alloy profile extrusion simulation model to obtain the current cross-sectional shape joint relationship information; Among them, the current cross-sectional shape joint relationship information includes strain data of the current cross-sectional shape, and the descriptive relationship between mechanical properties and grain size; The module 330 for determining the current residual stress field and the current cross-sectional shape thermal bending geometric model is used to analyze and calculate the initial profile blank cross-sectional shape through a preset thermal bending creep constitutive simulation model if the mechanical properties of the current cross-sectional shape meet the preset part design and usage requirements, so as to obtain the current residual stress field and the current cross-sectional shape thermal bending geometric model. The current cross-sectional shape milling machining geometry model determination module 340 is used to establish a titanium alloy profile milling simulation model based on the current cross-sectional shape hot bending geometry model, and to perform milling machining analysis in combination with the current residual stress field to obtain the current cross-sectional shape milling machining geometry model; The target titanium alloy extruded profile cross-sectional dimension determination module 350 is used to determine the target titanium alloy extruded profile cross-sectional dimension based on the current cross-sectional shape hot bending geometry model and the current cross-sectional shape milling geometry model.

[0069] The technical solution of this invention involves acquiring and processing the cross-sectional profile of the target part using a preset reverse design and proportional scaling method to obtain the initial profile blank cross-sectional shape; performing extrusion analysis on the initial profile blank cross-sectional shape using a pre-established titanium alloy profile extrusion simulation model to obtain the current cross-sectional shape joint relationship information; if the mechanical properties of the current cross-sectional shape meet the preset part design and usage requirements, then analyzing and calculating the initial profile blank cross-sectional shape using a preset hot-bending creep constitutive simulation model to obtain the current residual stress field and the current cross-sectional shape hot-bending geometric model; establishing a titanium alloy profile milling simulation model based on the current cross-sectional shape hot-bending geometric model, and performing milling analysis in conjunction with the current residual stress field to obtain the current cross-sectional shape milling geometric model; and determining the target titanium alloy extruded profile cross-sectional dimensions based on the current cross-sectional shape hot-bending geometric model and the current cross-sectional shape milling geometric model. It solves the problems of uneven mechanical properties of the profile caused by relying on human trial and error to determine the profile cross-section during the extrusion process, and the deformation difference in forming and milling caused by determining the cross-section only for the process parameters of a single manufacturing stage. It improves the accuracy of cross-section shape design and the efficiency of part development, and meets the design and usage requirements of mechanical properties and geometric accuracy.

[0070] Based on the above embodiments, the initial profile blank cross-sectional shape determination module 310 can be specifically used to: obtain the cross-sectional contour of the target part and obtain the part process feature description information; wherein, the part process feature description information includes at least one of the following: geometric features of hot drawing bending process, geometric features of milling process, and wall thickness of the target part; according to the part process feature description information, the cross-sectional thickness corresponding to the cross-sectional contour of the target part is proportionally enlarged according to a preset first ratio by the reverse design and proportional enlargement method to obtain the initial profile blank cross-sectional shape.

[0071] Based on the above embodiments, the current cross-sectional shape joint relationship information determination module 320 can be specifically used to: design the current extrusion die according to the initial profile blank cross-sectional shape, and perform feature division on the initial profile blank cross-sectional shape to obtain at least one divided cross-sectional region; obtain the macroscopic mechanical property data and microstructure data corresponding to each divided cross-sectional region through a preset region analysis method; wherein, the macroscopic mechanical property data includes at least one of the following: yield strength and tensile strength; the microstructure data includes average grain size; perform extrusion simulation on the current extrusion die through a preset titanium alloy profile extrusion simulation model to obtain strain data and the average dislocation density of the cross-section after extrusion; and establish the descriptive relationship between the strain data, mechanical properties and grain size of the current cross-sectional shape based on the strain data, yield strength, tensile strength and average grain size.

[0072] Based on the above embodiments, the current residual stress field and current cross-sectional shape hot-bending geometric model determination module 330 can be specifically used to: determine whether the mechanical properties of the divided cross-sectional regions meet the preset part design and usage requirements; if not, the cross-sectional thickness of the initial profile blank cross-sectional shape is proportionally reduced according to the second ratio, and the process is returned to execute the extrusion analysis of the initial profile blank cross-sectional shape using the pre-established titanium alloy profile extrusion simulation model to obtain the current cross-sectional shape joint relationship information; wherein, the second ratio is less than the first ratio; if satisfied, the initial profile blank cross-sectional shape is analyzed and calculated using the preset hot-bending creep constitutive simulation model to obtain the current residual stress field and current cross-sectional shape hot-bending geometric model.

[0073] Based on the above embodiments, the current residual stress field and current cross-sectional shape thermal bending geometric model determination module 330, through formula... To calculate the average misalignment density ;in, Both b and are material constants; The cross-sectional strain is calculated based on the average dislocation density and the average grain size using the tensile bending sub-model corresponding to the thermal bending creep constitutive simulation model. This yields the current tensile bending deformation stress, the current normalized dislocation rate, the current normalized average grain size ratio, and the current plastic strain. The thermal bending creep constitutive simulation model is constructed based on ABAQUS. The current tensile bending deformation stress, the current normalized dislocation rate, the current normalized average grain size ratio, and the current plastic strain are used as initial variables for the creep process. These variables are then combined with the creep sub-model corresponding to the thermal bending creep constitutive simulation model to calculate the current creep strain rate, the current residual stress field after creep, and the current cross-sectional shape of the thermal bending geometry model.

[0074] Based on the above embodiments, the current cross-sectional shape milling machining geometry model determination module 340 can be specifically used to: establish a titanium alloy profile milling simulation model based on the current cross-sectional shape hot bending geometry model; use the field transfer function of ABAQUS to transfer the current residual stress field to the titanium alloy profile milling simulation model, and remove the redundant mesh on the blank by milling to obtain the current cross-sectional shape milling machining geometry model.

[0075] Based on the above embodiments, the target titanium alloy extruded profile cross-sectional size determination module 350 can be specifically used to: if the current cross-sectional shape milling geometry model does not exceed the contour envelope of the current cross-sectional shape hot bending geometry model, then determine the target titanium alloy extruded profile cross-sectional size according to the current cross-sectional shape milling geometry model; if the current cross-sectional shape milling geometry model exceeds the contour envelope of the current cross-sectional shape hot bending geometry model, then return to execute the operation of obtaining and processing the initial profile blank cross-sectional shape according to the target part cross-sectional contour through a preset reverse design and proportional enlargement method.

[0076] The device for determining the cross-sectional dimensions of complex large-section titanium alloy extruded profiles provided in this embodiment of the invention can execute the method for determining the cross-sectional dimensions of complex large-section titanium alloy extruded profiles provided in any embodiment of the invention, and has the corresponding functional modules and beneficial effects of the method.

[0077] Example 4 Figure 4 A schematic diagram of an electronic device 10, which can be used to implement Embodiment 4 of the present invention, is shown. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as personal digital processors, cellular phones, smartphones, wearable devices (such as helmets, glasses, watches, etc.), and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely illustrative and are not intended to limit the implementation of the invention described and / or claimed herein.

[0078] like Figure 4 As shown, the electronic device 10 includes at least one processor 11 and a memory, such as a read-only memory (ROM) 12 or a random access memory (RAM) 13, communicatively connected to the at least one processor 11. The memory stores computer programs executable by the at least one processor. The processor 11 can perform various appropriate actions and processes based on the computer program stored in the ROM 12 or loaded from storage unit 18 into the RAM 13. The RAM 13 can also store various programs and data required for the operation of the electronic device 10. The processor 11, ROM 12, and RAM 13 are interconnected via a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0079] Multiple components in electronic device 10 are connected to I / O interface 15, including: input unit 16, such as keyboard, mouse, etc.; output unit 17, such as various types of displays, speakers, etc.; storage unit 18, such as disk, optical disk, etc.; and communication unit 19, such as network card, modem, wireless transceiver, etc. Communication unit 19 allows electronic device 10 to exchange information / data with other devices through computer networks such as the Internet and / or various telecommunications networks.

[0080] Processor 11 can be a variety of general-purpose and / or special-purpose processing components with processing and computing capabilities. Some examples of processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various special-purpose artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, digital signal processors (DSPs), and any suitable processor, controller, microcontroller, etc. Processor 11 performs the various methods and processes described above, such as the method for determining the cross-sectional dimensions of complex large-section titanium alloy extruded profiles.

[0081] In some embodiments, the method for determining the cross-sectional dimensions of complex large-section titanium alloy extruded profiles can be implemented as a computer program tangibly contained in a computer-readable storage medium, such as storage unit 18. In some embodiments, part or all of the computer program can be loaded and / or installed on electronic device 10 via ROM 12 and / or communication unit 19. When the computer program is loaded into RAM 13 and executed by processor 11, one or more steps of the method for determining the cross-sectional dimensions of complex large-section titanium alloy extruded profiles described above can be performed. Alternatively, in other embodiments, processor 11 can be configured to perform the method for determining the cross-sectional dimensions of complex large-section titanium alloy extruded profiles by any other suitable means (e.g., by means of firmware).

[0082] The method includes: acquiring and processing the cross-sectional profile of the target part using a preset reverse design and proportional scaling method to obtain the initial profile blank cross-sectional shape; performing extrusion analysis on the initial profile blank cross-sectional shape using a pre-established titanium alloy profile extrusion simulation model to obtain current cross-sectional shape joint relationship information; wherein, the current cross-sectional shape joint relationship information includes strain data of the current cross-sectional shape, and the descriptive relationship between mechanical properties and grain size; if the mechanical properties of the current cross-sectional shape meet the preset part design and usage requirements, then analyzing and calculating the initial profile blank cross-sectional shape using a preset hot-bending creep constitutive simulation model to obtain the current residual stress field and the current cross-sectional shape hot-bending geometric model; establishing a titanium alloy profile milling simulation model based on the current cross-sectional shape hot-bending geometric model, and performing milling analysis in conjunction with the current residual stress field to obtain the current cross-sectional shape milling geometric model; determining the target titanium alloy extruded profile cross-sectional dimensions based on the current cross-sectional shape hot-bending geometric model and the current cross-sectional shape milling geometric model.

[0083] Various embodiments of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field-programmable gate arrays (FPGAs), application-specific integrated circuits (ASICs), application-specific standard products (ASSPs), systems-on-a-chip (SoCs), payload-programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments may include implementations in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which may be a dedicated or general-purpose programmable processor, capable of receiving data and instructions from a storage system, at least one input device, and at least one output device, and transmitting data and instructions to the storage system, the at least one input device, and the at least one output device.

[0084] Computer programs used to implement the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, such that when executed by the processor, the computer programs cause the functions / operations specified in the flowcharts and / or block diagrams to be performed. The computer programs may be executed entirely on a machine, partially on a machine, or as a standalone software package, partially on a machine and partially on a remote machine, or entirely on a remote machine or server.

[0085] In the context of this invention, a computer-readable storage medium can be a tangible medium that may contain or store a computer program for use by or in conjunction with an instruction execution system, apparatus, or device. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination thereof. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. More specific examples of machine-readable storage media include electrical connections based on one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fibers, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof.

[0086] To provide interaction with a user, the systems and techniques described herein can be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and pointing device (e.g., a mouse or trackball) through which the user provides input to the electronic device. Other types of devices can also be used to provide interaction with the user; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including sound input, voice input, or tactile input).

[0087] The systems and technologies described herein can be implemented in computing systems that include backend components (e.g., as data servers), or middleware components (e.g., application servers), or frontend components (e.g., user computers with graphical user interfaces or web browsers through which users can interact with implementations of the systems and technologies described herein), or any combination of such backend, middleware, or frontend components. The components of the system can be interconnected via digital data communication of any form or medium (e.g., communication networks). Examples of communication networks include local area networks (LANs), wide area networks (WANs), blockchain networks, and the Internet.

[0088] A computing system can include clients and servers. Clients and servers are generally located far apart and typically interact through communication networks. The client-server relationship is created by computer programs running on the respective computers and having a client-server relationship with each other. The server can be a cloud server, also known as a cloud computing server or cloud host, which is a hosting product within the cloud computing service system to address the shortcomings of traditional physical hosts and VPS services, such as high management difficulty and weak business scalability.

[0089] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0090] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

[0091] Example 5 Embodiment 5 of the present invention also provides a computer-readable storage medium, wherein the computer-readable instructions, when executed by a computer processor, are used to perform a method for determining the cross-sectional dimensions of a complex large-section titanium alloy extruded profile. The method includes: acquiring and processing the cross-sectional profile of a target part using a preset reverse design and proportional scaling method to obtain an initial profile blank cross-sectional shape; performing extrusion analysis processing on the initial profile blank cross-sectional shape using a pre-established titanium alloy profile extrusion simulation model to obtain current cross-sectional shape joint relationship information; wherein the current cross-sectional shape joint relationship information includes strain data and mechanical properties of the current cross-sectional shape. The relationship between the energy and grain size is described; if the mechanical properties of the current cross-sectional shape meet the preset part design requirements, the initial profile blank cross-sectional shape is analyzed and calculated using a preset hot-stretching and creep constitutive simulation model to obtain the current residual stress field and the hot-stretching and bending geometric model of the current cross-sectional shape; a titanium alloy profile milling simulation model is established based on the hot-stretching and bending geometric model of the current cross-sectional shape, and milling processing analysis is performed in conjunction with the current residual stress field to obtain the milling processing geometric model of the current cross-sectional shape; the target titanium alloy extruded profile cross-sectional dimensions are determined based on the hot-stretching and bending geometric model of the current cross-sectional shape and the milling processing geometric model of the current cross-sectional shape.

[0092] Of course, the computer-executable instructions provided in the embodiments of the present invention, which include a computer-readable storage medium, are not limited to the method operations described above, but can also perform related operations in the method for determining the cross-sectional dimensions of complex large-section titanium alloy extruded profiles provided in any embodiment of the present invention.

[0093] Based on the above description of the implementation methods, those skilled in the art can clearly understand that the present invention can be implemented using software and necessary general-purpose hardware, and of course, it can also be implemented using hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as a computer floppy disk, read-only memory (ROM), random access memory (RAM), flash memory, hard disk, or optical disk, etc., including several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments of the present invention.

[0094] It is worth noting that in the embodiments of the above-mentioned method for determining the cross-sectional dimensions of complex large-section titanium alloy extruded profiles, the various units and modules included are only divided according to functional logic, but are not limited to the above division, as long as the corresponding functions can be achieved; in addition, the specific names of each functional unit are only for easy differentiation and are not used to limit the scope of protection of the present invention.

[0095] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A method for determining the cross-sectional dimensions of a complex large cross-section titanium alloy extruded profile, characterized in that, include: The initial profile blank cross-sectional shape is obtained by processing the target part cross-sectional profile through a preset reverse design and proportional enlargement method. By using a pre-established titanium alloy profile extrusion simulation model, the initial profile blank cross-sectional shape is subjected to extrusion analysis to obtain the current cross-sectional shape joint relationship information; Among them, the current cross-sectional shape joint relationship information includes strain data of the current cross-sectional shape, and the descriptive relationship between mechanical properties and grain size; If the mechanical properties of the current cross-sectional shape meet the preset part design requirements, the initial profile blank cross-sectional shape is analyzed and calculated using the preset thermal bending creep constitutive simulation model to obtain the current residual stress field and the thermal bending geometric model of the current cross-sectional shape. A simulation model for milling titanium alloy profiles is established based on the current cross-sectional shape thermal bending geometric model, and a milling process analysis is performed in conjunction with the current residual stress field to obtain the current cross-sectional shape milling process geometric model. The cross-sectional dimensions of the target titanium alloy extruded profile are determined based on the current cross-sectional shape hot bending geometry model and the current cross-sectional shape milling geometry model.

2. The method of claim 1, wherein, The process of acquiring and processing the target part's cross-sectional profile using a preset reverse design and proportional scaling method to obtain the initial profile blank cross-sectional shape includes: Obtain the cross-sectional profile of the target part and the description information of the part's process features; The part process feature description information includes at least one of the following: geometric features of hot drawing bending forming process, geometric features of milling processing process, and target part wall thickness; Based on the part's process feature description information, the cross-sectional thickness corresponding to the cross-sectional profile of the target part is proportionally enlarged according to a preset first ratio using the reverse design and proportional enlargement method to obtain the initial profile blank cross-sectional shape.

3. The method of claim 2, wherein, The process involves using a pre-established titanium alloy profile extrusion simulation model to perform extrusion analysis on the initial profile blank cross-sectional shape, obtaining the current cross-sectional shape joint relationship information, including: Based on the initial profile blank cross-sectional shape, the current extrusion die is designed, and the initial profile blank cross-sectional shape is feature-divided to obtain at least one divided cross-sectional region; Using a pre-defined region analysis method, macroscopic mechanical property data and microstructure data corresponding to each divided cross-sectional region are obtained; wherein, the macroscopic mechanical property data includes at least one of the following: yield strength and tensile strength; the microstructure data includes average grain size; The current extrusion die is subjected to extrusion simulation using a preset titanium alloy profile extrusion simulation model to obtain strain data and the average dislocation density of the cross section after extrusion. Based on strain data, yield strength, tensile strength, and average grain size, a descriptive relationship between strain data, mechanical properties, and grain size for the current cross-sectional shape is established.

4. The method of claim 3, wherein, If the mechanical properties of the current cross-sectional shape meet the preset part design and usage requirements, then the initial profile blank cross-sectional shape is analyzed and calculated using a preset thermal bending creep constitutive simulation model to obtain the current residual stress field and the current cross-sectional shape thermal bending geometric model, including: Determine whether the mechanical properties of the divided cross-sectional regions meet the preset part design and usage requirements. If not, the cross-sectional thickness of the initial profile blank cross-section shape is proportionally reduced according to the second ratio, and return to execute the extrusion analysis processing of the initial profile blank cross-section shape through the pre-established titanium alloy profile extrusion simulation model to obtain the current cross-sectional shape joint relationship information. Wherein, the second ratio is less than the first ratio; If satisfied, the initial profile blank cross-sectional shape is analyzed and calculated using a preset thermal bending creep constitutive simulation model to obtain the current residual stress field and the current cross-sectional shape thermal bending geometric model.

5. The method of claim 4, wherein, The process involves analyzing and calculating the initial profile blank cross-sectional shape using a preset thermal bending creep constitutive simulation model to obtain the current residual stress field and the current cross-sectional shape thermal bending geometric model, including: The average dislocation density is calculated by the formula ; wherein and b are both material constants; and is the cross-sectional strain. Based on the average dislocation density and the average grain size, the current tensile bending deformation stress, the current normalized dislocation rate, the current normalized average grain size ratio, and the current plastic strain are calculated using the tensile bending sub-model corresponding to the thermal bending creep constitutive simulation model. The thermal bending creep constitutive simulation model is constructed based on ABAQUS. The current tensile bending deformation stress, current normalized misalignment rate, current normalized average grain size ratio, and current plastic strain are used as initial variables for the creep process. The current creep strain rate, the current residual stress field after creep, and the current cross-sectional shape of the thermal bending geometric model are calculated by combining the creep sub-model corresponding to the thermal bending creep constitutive simulation model.

6. The method of claim 5, wherein, The establishment of a titanium alloy profile milling simulation model based on the current cross-sectional shape thermal bending geometric model, combined with the current residual stress field for milling analysis, yields the current cross-sectional shape milling geometric model, including: A simulation model for milling titanium alloy profiles is established based on the current cross-sectional shape thermal bending geometric model. Using the field transfer function of ABAQUS, the current residual stress field is transferred to the milling simulation model of the titanium alloy profile. The milling process removes the excess mesh on the blank, and the current cross-sectional shape milling geometry model is obtained.

7. The method according to claim 1, characterized in that, The determination of the target titanium alloy extruded profile cross-sectional dimensions based on the current cross-sectional shape hot bending geometry model and the current cross-sectional shape milling geometry model includes: If the current cross-sectional shape milling geometry model does not exceed the contour envelope of the current cross-sectional shape hot bending geometry model, then the target titanium alloy extruded profile cross-sectional dimensions are determined based on the current cross-sectional shape milling geometry model. If the current cross-sectional shape milling geometry model exceeds the contour envelope of the current cross-sectional shape hot bending geometry model, then return to the operation of obtaining and processing the initial profile blank cross-sectional shape according to the target part cross-sectional contour through a preset reverse design and proportional enlargement method.

8. A device for determining the cross-sectional dimensions of complex large-section titanium alloy extruded profiles, characterized in that, include: The initial profile blank cross-sectional shape determination module is used to obtain and process the target part's cross-sectional profile through a preset reverse design and proportional enlargement method to obtain the initial profile blank cross-sectional shape. The current cross-sectional shape joint relationship information determination module is used to perform extrusion analysis on the initial profile blank cross-sectional shape through a pre-established titanium alloy profile extrusion simulation model to obtain the current cross-sectional shape joint relationship information; Among them, the current cross-sectional shape joint relationship information includes strain data of the current cross-sectional shape, and the descriptive relationship between mechanical properties and grain size; The module for determining the current residual stress field and the current cross-sectional shape thermal bending geometric model is used to analyze and calculate the initial profile blank cross-sectional shape through a preset thermal bending creep constitutive simulation model if the mechanical properties of the current cross-sectional shape meet the preset part design requirements, so as to obtain the current residual stress field and the current cross-sectional shape thermal bending geometric model. The current cross-sectional shape milling machining geometry model determination module is used to establish a titanium alloy profile milling simulation model based on the current cross-sectional shape hot bending geometry model, and to perform milling machining analysis in combination with the current residual stress field to obtain the current cross-sectional shape milling machining geometry model; The target titanium alloy extruded profile cross-sectional dimension determination module is used to determine the target titanium alloy extruded profile cross-sectional dimension based on the current cross-sectional shape hot bending geometry model and the current cross-sectional shape milling geometry model.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements a method for determining the cross-sectional dimensions of a complex large-section titanium alloy extruded profile as described in any one of claims 1-7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions that cause a processor to execute a method for determining the cross-sectional dimensions of a complex large-section titanium alloy extruded profile as described in any one of claims 1-7.

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