Methods and devices for locating strain measurement points in thin-walled components and equipment for processing thin-walled components

Abstract

This invention provides a method, apparatus, and processing equipment for locating strain measurement points on thin-walled components. The method includes: determining multiple candidate strain measurement points on the simulated thin-walled component; determining the strain value of each candidate strain measurement point under a preset virtual clamping force; determining the validity value of each candidate strain measurement point based on the strain value and a strain measurement point validity determination model; determining a target strain measurement point among the multiple candidate strain measurement points based on the validity value; and determining the actual strain measurement point of the thin-walled component based on the target strain measurement point. This invention determines the validity value of each candidate strain measurement point based on the strain value and a strain measurement point validity determination model, and determines the target strain measurement point among the multiple candidate strain measurement points based on the validity value. This eliminates the uncertainty of human experience, improves the reliability of the determined target strain measurement point, and thus improves the reliability of the actual strain measurement point.

Description

Technical Field

[0001] This invention relates to the field of thin-walled part machining technology, specifically to a method, device, and equipment for locating strain measurement points on thin-walled parts. Background Technology

[0002] Thin-walled parts are widely used in modern manufacturing due to their high structural performance and lightweight characteristics. However, thin-walled parts have complex structures, low stiffness, and high precision requirements. During their machining, the choice of fixtures and machining processes significantly impacts deformation. Furthermore, most fixture processes are manual, introducing many unpredictable factors. For a long time, the machining industry has been plagued by the decreased machining accuracy caused by these unstable fixture processes.

[0003] To address this issue, the academic community has proposed an on-machine estimation system to achieve efficient and rapid analysis of clamping forces and workpiece deformation. This system enables visualization of the workpiece clamping state and improves the machining accuracy of thin-walled parts. Determining the strain measurement points of thin-walled parts is a prerequisite for accurate estimation by the on-machine estimation system. Current technologies rely on human experience to determine these points. However, this method leads to low reliability and slow determination speed.

[0004] Therefore, there is an urgent need to provide a method, device, and processing equipment for locating strain measurement points in thin-walled components, so as to quickly and accurately determine the strain measurement points of thin-walled components. Summary of the Invention

[0005] In view of this, it is necessary to provide a method, device and processing equipment for locating strain measurement points of thin-walled parts, so as to solve the technical problems of low reliability and slow determination speed of strain measurement points of thin-walled parts in the prior art.

[0006] On one hand, the present invention provides a method for locating strain measurement points on thin-walled components, used to locate strain measurement points during the clamping process based on a simulated thin-walled component corresponding to the thin-walled component. The method for locating strain measurement points on thin-walled components includes:

[0007] Determine multiple candidate strain measurement points for the simulated thin-walled component;

[0008] Determine the strain value of each candidate strain measurement point under the action of a preset virtual clamping force;

[0009] The validity value of each candidate strain measurement point is determined based on the strain value and the strain measurement point validity determination model.

[0010] The target strain measurement point among the plurality of candidate strain measurement points is determined based on the validity value of the measurement point.

[0011] The actual strain measurement point of the thin-walled component is determined based on the target strain measurement point.

[0012] In some possible implementations, determining multiple candidate strain measurement points for the simulated thin-walled component includes:

[0013] The simulated thin-walled part is meshed to obtain multiple meshes;

[0014] Obtain multiple grid intersection points from the multiple grids, and use these multiple grid intersection points as multiple candidate strain measurement points.

[0015] In some possible implementations, the preset virtual clamping force includes a first virtual clamping force and a second virtual clamping force, wherein the first virtual clamping force and the second virtual clamping force are in the same direction but different in magnitude.

[0016] In some possible implementations, the strain measurement point validity determination model includes an initial clamping force sensitive sub-model and a clamping force change sensitive sub-model; the step of determining the measurement point validity value of each candidate strain measurement point based on the strain value and the strain measurement point validity determination model includes:

[0017] The initial clamping force sensitivity value of the candidate strain measurement point is determined based on the strain value and the initial clamping force sensitive sub-model.

[0018] The clamping force change sensitivity value of the candidate strain measurement point is determined based on the strain value and the clamping force change sensitivity sub-model.

[0019] The validity value of the candidate strain measurement point is determined based on the initial clamping force sensitivity value and the clamping force change sensitivity value.

[0020] In some possible implementations, determining the target strain measurement point among the plurality of candidate strain measurement points based on the validity value of the measurement point includes:

[0021] Determine at least one strain-sensitive region in the simulated thin-walled component based on the effectiveness values ​​of the measurement points;

[0022] The target strain measurement point is selected from the at least one strain-sensitive region based on a preset measurement point selection rule.

[0023] In some possible implementations, the method for locating strain measurement points on thin-walled components further includes:

[0024] At least one strain-insensitive region in the simulated thin-walled component is determined based on the validity value of the measurement point.

[0025] Based on preset measurement point selection rules, target insensitive measurement points are selected from at least one strain insensitive region;

[0026] The effectiveness of the target strain measurement point is verified based on the target non-sensitive measurement point.

[0027] In some possible implementations, verifying the effectiveness of the target strain measurement point based on the target insensitive measurement point includes:

[0028] Obtain the target strain value at the target strain measurement point, and determine the first deformation of the simulated thin-walled component based on the target strain value;

[0029] Obtain the insensitive strain value of the target insensitive measuring point, and determine the second deformation of the simulated thin-walled component based on the insensitive strain value;

[0030] The third deformation of the simulated thin-walled component is determined based on the strain values ​​at each of the candidate strain measurement points;

[0031] When the first deformation is greater than the third deformation, and the third deformation is greater than the second deformation, the target strain measurement point is an effective strain measurement point.

[0032] In some possible implementations, the method for locating strain measurement points on thin-walled components further includes:

[0033] Obtain the true strain value of the true strain measurement point, and determine the true deformation of the thin-walled component based on the true strain value;

[0034] The simulated deformation of the simulated thin-walled component is determined based on the target strain value at the target strain measurement point.

[0035] Determine whether the ratio of the difference between the actual deformation and the simulated deformation to the actual deformation is less than a preset ratio; if the ratio is less than the preset ratio, the target strain measurement point is valid; if the ratio is greater than or equal to the preset ratio, the target strain measurement point is invalid.

[0036] On the other hand, the present invention also provides a strain measurement point positioning device for thin-walled parts, used to position strain measurement points during the clamping process based on a simulated thin-walled part corresponding to the thin-walled part, the strain measurement point positioning device for thin-walled parts comprising:

[0037] A candidate strain measurement point determination unit is used to determine multiple candidate strain measurement points of the simulated thin-walled component;

[0038] The strain value determination unit is used to determine the strain value of each candidate strain measurement point under the action of a preset virtual clamping force.

[0039] The measurement point validity value determination unit is used to determine the measurement point validity value of each of the candidate strain measurement points based on the strain value and the strain measurement point validity determination model.

[0040] The target strain measurement point determination unit is used to determine the target strain measurement point among the plurality of candidate strain measurement points based on the measurement point validity value;

[0041] The actual strain measurement point determination unit is used to determine the actual strain measurement point of the thin-walled component based on the target strain measurement point.

[0042] On the other hand, the present invention also provides a thin-walled part processing apparatus, including a memory and a processor, wherein,

[0043] The memory is used to store programs;

[0044] The processor, coupled to the memory, is used to execute the program stored in the memory to implement the steps in the thin-walled component strain measurement point positioning method described in any of the above implementations.

[0045] The beneficial effects of the above embodiments are as follows: Compared with the prior art method of determining the true strain measurement point through human experience, the strain measurement point validity determination model provided by the present invention can determine the validity value of each candidate strain measurement point based on the strain value and the model. Based on the validity value, the target strain measurement point among multiple candidate strain measurement points is determined, eliminating the uncertainty of human experience and improving the reliability of the determined target strain measurement point, thereby improving the reliability of the true strain measurement point. Furthermore, the present invention can determine the true strain measurement point based on the proposed strain measurement point validity determination model and the strain values ​​of the determined candidate strain measurement points, without requiring excessive human involvement in the calculation and measurement process, thus improving the speed of determining the true strain measurement point. Attached Figure Description

[0046] 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.

[0047] Figure 1 A schematic flowchart of an embodiment of the strain measurement point positioning method for thin-walled components provided by the present invention;

[0048] Figure 2 For the present invention Figure 1 A schematic diagram of an embodiment of S101;

[0049] Figure 3 A schematic diagram of an embodiment of the thin-walled component provided by the present invention;

[0050] Figure 4 For the present invention Figure 1 A schematic diagram of an embodiment of S103;

[0051] Figure 5 For the present invention Figure 1 A schematic diagram of an embodiment of S104;

[0052] Figure 6 A schematic diagram of an embodiment of the strain-sensitive region along the X-axis direction provided by the present invention;

[0053] Figure 7 A schematic diagram of an embodiment of the strain-sensitive region along the Y-axis provided by the present invention;

[0054] Figure 8 A schematic flowchart of an embodiment for verifying the effectiveness of target strain measurement points provided by the present invention;

[0055] Figure 9 For the present invention Figure 8 A schematic diagram of an embodiment of S803;

[0056] Figure 10 A schematic diagram of another embodiment of the present invention for verifying the effectiveness of the target strain measurement point;

[0057] Figure 11 This is a schematic diagram of an embodiment of the strain measuring point positioning device for thin-walled components provided by the present invention;

[0058] Figure 12 This is a schematic diagram of an embodiment of the thin-walled part processing equipment provided by the present invention. Detailed Implementation

[0059] 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 a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0060] The terms "first," "second," etc., used in the embodiments of this invention are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a technical feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature.

[0061] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0062] This invention provides a method, apparatus, and equipment for locating strain measurement points on thin-walled parts, which will be described below.

[0063] Figure 1 This is a schematic flowchart of an embodiment of the strain measurement point positioning method for thin-walled parts provided by the present invention. It is used to locate strain measurement points during the clamping process based on a simulated thin-walled part corresponding to the thin-walled part. Figure 1 As shown, the method for locating strain measurement points on thin-walled components includes:

[0064] S101. Determine multiple candidate strain measurement points for the simulated thin-walled component;

[0065] S102. Determine the strain value of each candidate strain measurement point under the action of the preset virtual clamping force;

[0066] S103. Determine the validity value of each candidate strain measurement point based on the strain value and the validity of the strain measurement point determination model;

[0067] S104. Determine the target strain measurement point among multiple candidate strain measurement points based on the validity value of the measurement point;

[0068] S105. Determine the actual strain measurement points of the thin-walled component based on the target strain measurement points.

[0069] Compared with existing technologies, the strain measurement point location method for thin-walled components provided in this invention, compared with the existing method of determining the true strain measurement point through human experience, uses a proposed strain measurement point validity determination model. This model determines the validity value of each candidate strain measurement point based on the strain value and the model itself. The target strain measurement point is then determined from among multiple candidate strain measurement points based on the validity value, eliminating the uncertainty of human experience and improving the reliability of the determined target strain measurement point, thereby improving the reliability of the true strain measurement point. Furthermore, this invention can determine the true strain measurement point based on the proposed strain measurement point validity determination model and the strain values ​​of the determined candidate strain measurement points, without requiring excessive human involvement in the calculation and measurement process, thus improving the speed of determining the true strain measurement point.

[0070] In step S101, the simulated thin-walled component can be a virtual model generated in simulation software based on the thin-walled component. The simulation software can be a finite element method (FEM) simulation software, including but not limited to ANSYS, ADINA, MSC, or ABAQUS software.

[0071] In step S103, the strain measurement point validity determination model refers to the calculation model used to determine whether each candidate strain measurement point can be used as the target strain measurement point. That is, the target strain measurement point can be determined from the measurement point validity value determined by the strain measurement point validity model.

[0072] It should be noted that the model for determining the validity of strain measurement points can be constructed based on parameters related to the target strain measurement point obtained from work experience. For example, the target strain measurement point refers to a measurement point with large strain and sensitive to changes in clamping force. In this case, the model for determining the validity of strain measurement points should include parameters related to the strain magnitude and the sensitivity to changes in strain force.

[0073] It should be understood that the strain measurement point validity determination model can be constructed synchronously when executing step S103, or it can be constructed in advance and stored in the storage medium, and the strain measurement point validity determination model can be called from the storage medium when executing step S103.

[0074] In some embodiments of the present invention, such as Figure 2 As shown, step S101 includes:

[0075] S201. Mesh the simulated thin-walled part to obtain multiple meshes;

[0076] S202. Obtain multiple grid intersection points from multiple grids and use these multiple grid intersection points as multiple candidate strain measurement points.

[0077] In step S201, the simulated thin-walled part can be meshed according to the meshing unit built into the simulation software, or the simulated thin-walled part can be meshed according to professional meshing software.

[0078] Specifically, mesh generation software includes, but is not limited to, ICEM-CFD, Global, Gridgen, Gambit, CFX-build, and CFD-Geom.

[0079] It should be noted that mesh generation needs to be based on boundary conditions, which include, but are not limited to, the material of the thin-walled part, the material of the fixture, the mesh size, and the contact type between the thin-walled part and the fixture.

[0080] Since the actual strain measurement point should be a point with large strain and very sensitive to changes in clamping force, in some embodiments of the present invention, the preset virtual clamping force includes a first virtual clamping force and a second virtual clamping force, and the first virtual clamping force and the second virtual clamping force have the same direction but different magnitudes.

[0081] By setting the first virtual clamping force and the second virtual clamping force to have the same direction but different magnitudes, the true strain measurement point that is sensitive to changes in clamping force can be determined, thereby further improving the reliability of the determined true strain measurement point.

[0082] It should be noted that the preset virtual clamping force may also include other virtual clamping forces with directions different from the first and second virtual clamping forces. The specific number of virtual clamping forces with different directions should be determined based on the structure of the thin-walled part. If the thin-walled part is one-dimensional, only a virtual clamping force in one direction is needed; if the thin-walled part is two-dimensional, virtual clamping forces in two directions are needed; and if the thin-walled part is three-dimensional, virtual clamping forces in three directions are needed.

[0083] In specific embodiments of the present invention, such as Figure 3 As shown, the thin-walled part is a two-dimensional thin-walled part I, which is clamped by a toe-type clamp II, a side clamp III, a plane locator IV, a toe-type locator V, and a worktable VI. The virtual clamping force includes a first-direction virtual clamping force F1 along the negative Y-axis and a second-direction virtual clamping force F2 along the negative X-axis. The first-direction virtual clamping force F1 and the second-direction virtual clamping force F2 are divided into three groups of virtual clamping forces, as shown in Table 1.

[0084] Table 1 Virtual clamping force settings

[0085]

[0086] In a specific embodiment of the present invention, the boundary conditions are shown in Table 2:

[0087] Table 2 Boundary Conditions

[0088]

[0089] In some embodiments of the present invention, the strain measurement point validity determination model includes an initial clamping force sensitive sub-model and a clamping force change sensitive sub-model; then, as follows Figure 4 As shown, step S103 includes:

[0090] S401. Determine the initial clamping force sensitivity value of the candidate strain measurement point based on the strain value and the initial clamping force sensitive sub-model.

[0091] S402. Determine the clamping force change sensitivity value of the candidate strain measurement point based on the strain value and the clamping force change sensitivity sub-model;

[0092] S403. Determine the validity value of candidate strain measurement points based on the initial clamping force sensitivity value and the clamping force change sensitivity value.

[0093] The embodiments of the present invention, by setting a strain measurement point effectiveness determination model including an initial clamping force sensitive sub-model and a clamping force change sensitive sub-model, can determine the target strain measurement point that is sensitive to the initial clamping force and highly sensitive to the clamping force change, thereby further improving the reliability of the target strain measurement point.

[0094] In a specific embodiment of the present invention, the model for determining the effectiveness of strain measurement points is as follows:

[0095] EOP i =EOP 1i +EOP 2i

[0096]

[0097]

[0098] δS i =max k∈(1,M) (ΔS i,k -ΔS i,n )

[0099] In the formula, EOP i EOP is the measurement validity value of the i-th candidate strain measurement point; 1i EOP is the initial clamping force sensitivity value for the i-th candidate strain measurement point; 2i ΔS represents the sensitivity value of the clamping force change at the i-th candidate strain measurement point; i,n ΔS represents the degree to which the strain at the i-th candidate strain measurement point at the n-th time node changes with the maximum clamping force; j,n δS represents the degree of strain variation with maximum clamping force at the nth time node of the j-th candidate strain measurement point; N is the total number of candidate strain measurement points; δS i δS is the process coefficient for the i-th candidate strain measurement point to resist the increase of the maximum clamping force; j The process coefficient for resisting the increase of maximum clamping force at the j-th candidate strain measurement point; M is the total number of virtual clamping forces; ΔS i,k The degree to which the strain at the i-th candidate strain measurement point changes with the maximum clamping force under the action of the k-th group of virtual clamping forces.

[0100] In some embodiments of the present invention, such as Figure 5 As shown, step S104 includes:

[0101] S501. Determine at least one strain-sensitive region in the simulated thin-walled component based on the effectiveness values ​​of the measuring points;

[0102] S502. Select target strain measurement points from at least one strain-sensitive region based on preset measurement point selection rules.

[0103] Specifically, step S501 involves assigning different colors or different gray levels to each candidate strain measurement point according to the order of the validity values ​​of the measurement points from largest to smallest, so that the simulated thin-walled part can be displayed on the simulation software, and at least one strain-sensitive region can be determined based on the different colors or different gray levels.

[0104] In a specific embodiment of the present invention, the thin-walled component is... Figure 3 The thin-walled component shown is as follows: Figure 6 As shown, the simulated thin-walled component includes six strain-sensitive regions along the X-axis, labeled 1, 2, 3, 4, 5, and 6 to represent six strain-sensitive regions with varying degrees of sensitivity. Figure 7 As shown, the simulated thin-walled component includes six strain-sensitive regions along the Y-axis, which are also numbered 1, 2, 3, 4, 5, and 6 to represent six strain-sensitive regions with sensitivity ranging from strong to weak.

[0105] In a specific embodiment of the present invention, the preset measurement point selection rule in step S502 is as follows:

[0106] (1) The target strain measurement point cannot be selected from the clamping area;

[0107] (2) The target strain measurement point cannot be selected from the region near the edge of the thin-walled structure;

[0108] (3) The target strain measurement point cannot be selected from the area to be processed;

[0109] (4) Tables that serve as positioning references for targets should not be selected.

[0110] By setting the above four measurement point selection rules, unreasonable selection of target strain measurement points can be avoided, thereby further improving the reliability of the determined target strain measurement points.

[0111] It should be understood that the number of target strain measurement points can be selected according to the actual application scenario. In a specific embodiment of the present invention, one target strain measurement point sensitive along the X-axis direction and one target strain measurement point sensitive along the Y-axis direction are selected respectively. The target strain measurement point sensitive along the X-axis direction is numbered (135409, 139415), and the target strain measurement point sensitive along the Y-axis direction is numbered (113271, 134859). The numbers in the numbering represent the grid intersection points along the X-axis and along the Y-axis.

[0112] To avoid errors in the simulation process of determining target strain measurement points, or due to unreasonable selection of target strain measurement points in the strain-sensitive region, leading to inaccurate estimation of thin-walled component deformation determined by actual strain measurement points, in some embodiments of the present invention, such as... Figure 8 As shown, the method for locating strain measurement points on thin-walled components also includes:

[0113] S801. Determine at least one strain-insensitive region in the simulated thin-walled component based on the effective values ​​of the measuring points;

[0114] S802. Select target insensitive measurement points from at least one strain insensitive region based on preset measurement point selection rules;

[0115] S803. Verify the effectiveness of the target strain measurement points based on the target's non-sensitive measurement points.

[0116] In this embodiment of the invention, the target non-sensitive measurement point is used as a reference for the target strain measurement point to verify the effectiveness of the target strain measurement point, which can improve the rationality and reliability of the determined target strain measurement point.

[0117] It should be understood that the strain-insensitive region in step S801 can be any region in the simulated thin-walled component other than the strain-sensitive region. The preset measurement point selection rules in step S802 are the same as those in step S502, and will not be repeated here.

[0118] In a specific embodiment of the present invention, a target insensitive measuring point that is insensitive along the X-axis direction and a target insensitive measuring point that is insensitive along the Y-axis direction are selected respectively. The target insensitive measuring point that is insensitive along the X-axis direction is numbered (134918, 139512), and the target insensitive measuring point that is insensitive along the Y-axis direction is numbered (114997, 135305).

[0119] In some embodiments of the present invention, such as Figure 9 As shown, step S803 includes:

[0120] S901. Obtain the target strain value at the target strain measurement point, and determine the first deformation of the simulated thin-walled part based on the target strain value.

[0121] S902. Obtain the insensitive strain value of the target insensitive measuring point, and determine the second deformation of the simulated thin-walled part based on the insensitive strain value;

[0122] S903. Determine the third deformation of the simulated thin-walled component based on the strain values ​​of each candidate strain measurement point.

[0123] S904. When the first deformation is greater than the third deformation, and the third deformation is greater than the second deformation, the target strain measurement point is an effective strain measurement point.

[0124] This is because when the first deformation is greater than the third deformation, and the third deformation is greater than the second deformation, it indicates that the target strain measurement point is sensitive to both the initial clamping force and changes in the clamping force. In other words, the target strain measurement point is a valid strain measurement point and can be used as a strain measurement point in the onboard estimation system. Therefore, by determining the first, second, and third deformations, and then determining whether the target strain measurement point is valid based on the first, second, and third deformations, this embodiment of the invention can improve the effectiveness and rationality of the determined target strain measurement point.

[0125] It should be noted that the first deformation amount can be divided into multiple sub-deformation amounts according to the actual structure of the thin-walled part. In a specific embodiment of the present invention, the first deformation amount is... Figure 3 Taking a thin-walled component as an example, the first deformation includes five sub-deformation quantities: A, B, C, D, and E. Similarly, the second and third deformation quantities also include five sub-deformation quantities: A, B, C, D, and E, respectively.

[0126] In a specific embodiment of the present invention, the first deformation amount, the second deformation amount, and the third deformation amount are shown in Table 3:

[0127] Table 3. Deformation of Simulated Thin-Walled Parts

[0128] A[μm] B[μm] C[μm] D[μm] E[μm] First deformation amount -29.39 -8.63 -280.39 -296.81 -8.43 Second deformation amount -14.68 -5.36 -227.3 -226.3 -5.34 Third deformation amount -21.54 -8.43 -271.83 -265.79 -7.13

[0129] In Table 3, the symbols represent directions. As can be seen from Table 3, in the specific embodiment of the present invention, the first deformation is greater than the third deformation, and the third deformation is greater than the second deformation. Furthermore, the difference between the first and second deformations is small, verifying the effectiveness of the target strain measurement point determined in the embodiment of the present invention, thereby verifying the effectiveness of the thin-walled component strain measurement point positioning method proposed in the embodiment of the present invention.

[0130] To avoid the technical problem of low accuracy in target strain measurement points obtained from simulations that are not entirely identical to actual scenarios and are overly idealized, some embodiments of the present invention, such as... Figure 10 As shown, the method for locating strain measurement points on thin-walled components also includes:

[0131] S1001. Obtain the true strain value of the true strain measurement point, and determine the true deformation of the thin-walled part based on the true strain value;

[0132] S1002. Determine the simulated deformation of the thin-walled component based on the target strain value at the target strain measurement point.

[0133] S1003. Determine whether the ratio of the difference between the actual deformation and the simulated deformation to the actual deformation is less than a preset ratio. If the ratio is less than the preset ratio, the target strain measurement point is valid. If the ratio is greater than or equal to the preset ratio, the target strain measurement point is invalid.

[0134] The embodiments of the present invention verify the effectiveness of the target strain measurement point by obtaining the actual deformation of the thin-walled part, which can avoid the technical problem that the target strain measurement point is unreliable due to the single simulation verification. By further verifying the effectiveness of the target strain measurement point determined by the simulation through the actual deformation, the reliability of the target strain measurement point can be further improved.

[0135] It should be understood that step S1001 can obtain the true strain value by attaching a contact strain sensor to the actual strain measurement point, or by remotely obtaining the true strain value through a non-contact strain sensor.

[0136] Among them, the contact strain sensor can be a strain gauge sensor, and the non-contact strain sensor can be a laser strain sensor.

[0137] It should also be understood that the preset ratio can be set according to the actual application scenario or experience value. In a specific embodiment of the present invention, the preset ratio is 20%.

[0138] In a specific embodiment of the present invention, Figure 3 Taking a thin-walled component as an example, the actual deformation and simulated deformation are shown in Table 4:

[0139] Table 4. Actual Deformation and Simulated Deformation

[0140] A[μm] B[μm] C[μm] D[μm] E[μm] Simulated deformation -22.8 -8.1 -273 -274.3 -7.45 True deformation -27 -9.3 -284 -280 -8.57

[0141] As shown in Table 4, the ratio of the difference between the simulated deformation and the actual deformation to the actual deformation is at most 15.6%, which is less than the preset ratio. This verifies the effectiveness of the target strain measurement point determined in the embodiment of the present invention, and thus verifies the effectiveness of the strain measurement point positioning method for thin-walled parts proposed in the embodiment of the present invention.

[0142] It should be noted that, in order to maximize the effectiveness of the determined target strain measurement points, steps S901 to S904 and steps S1001 to S1003 can be executed simultaneously to verify the effectiveness of the target strain measurement points, thereby ensuring the effectiveness of the target strain measurement points and improving the reliability of the determined real strain measurement points.

[0143] To better implement the thin-walled component strain measurement point positioning method in the embodiments of the present invention, based on the thin-walled component strain measurement point positioning method, correspondingly, as follows: Figure 11As shown, this embodiment of the invention also provides a strain measurement point positioning device for thin-walled components. The strain measurement point positioning device 1100 for thin-walled components includes:

[0144] The candidate strain measurement point determination unit 1101 is used to determine multiple candidate strain measurement points of the simulated thin-walled component;

[0145] The strain value determination unit 1102 is used to determine the strain value of each candidate strain measurement point under the action of a preset virtual clamping force.

[0146] The measurement point validity value determination unit 1103 is used to determine the measurement point validity value of each of the candidate strain measurement points according to the strain value and the strain measurement point validity determination model.

[0147] The target strain measurement point determination unit 1104 is used to determine the target strain measurement point among the plurality of candidate strain measurement points based on the measurement point validity value;

[0148] The real strain measurement point determination unit 1105 is used to determine the real strain measurement point of the thin-walled component based on the target strain measurement point.

[0149] The thin-walled component strain measurement point positioning device 1100 provided in the above embodiments can realize the technical solutions described in the above thin-walled component strain measurement point positioning method embodiments. The specific implementation principles of each module or unit can be found in the corresponding content in the above thin-walled component strain measurement point positioning method embodiments, which will not be repeated here.

[0150] like Figure 12 As shown, the present invention also provides a thin-walled part processing device 1200. The thin-walled part processing device 1200 includes a processor 1201, a memory 1202, and a display 1203. Figure 12 Only some components of the thin-walled part processing equipment 1200 are shown, but it should be understood that it is not required to implement all the components shown, and more or fewer components may be implemented instead.

[0151] In some embodiments, processor 1201 may be a central processing unit (CPU), microprocessor or other data processing chip, used to run program code stored in memory 1202 or process data, such as the thin-walled component strain measurement point positioning method of the present invention.

[0152] In some embodiments, processor 1201 may be a single server or a group of servers. The server group may be centralized or distributed. In some embodiments, processor 1201 may be local or remote. In some embodiments, processor 1201 may be implemented on a cloud platform. In one embodiment, the cloud platform may include a private cloud, public cloud, hybrid cloud, community cloud, distributed cloud, inter-cloud, multi-cloud, or any combination thereof.

[0153] In some embodiments, memory 1202 may be an internal storage unit of the thin-walled part processing equipment 1200, such as a hard disk or memory of the thin-walled part processing equipment 1200. In other embodiments, memory 1202 may also be an external storage device of the thin-walled part processing equipment 1200, such as a pluggable hard disk, smart media card (SMC), secure digital (SD) card, flash card, etc., equipped on the thin-walled part processing equipment 1200.

[0154] Furthermore, the memory 1202 may include both internal storage units of the thin-walled part processing equipment 1200 and external storage devices. The memory 1202 is used to store application software and various types of data for which the thin-walled part processing equipment 1200 is installed.

[0155] In some embodiments, display 1203 may be an LED display, a liquid crystal display, a touch-sensitive liquid crystal display, or an OLED (Organic Light-Emitting Diode) touchscreen. Display 1203 is used to display information from the thin-walled part processing equipment 1200 and to display a visual user interface. Components 1201-1203 of the thin-walled part processing equipment 1200 communicate with each other via a system bus.

[0156] In some embodiments of the present invention, when the processor 1201 executes the strain measurement point positioning program for the thin-walled component in the memory 1202, the following steps can be implemented:

[0157] Determine multiple candidate strain measurement points for the simulated thin-walled component;

[0158] Determine the strain value of each candidate strain measurement point under the action of a preset virtual clamping force;

[0159] The validity value of each candidate strain measurement point is determined based on the strain value and the validity of the strain measurement point.

[0160] The target strain measurement point is determined from multiple candidate strain measurement points based on the effectiveness value of the measurement point.

[0161] Determine the actual strain measurement points of the thin-walled component based on the target strain measurement points.

[0162] It should be understood that when the processor 1201 executes the thin-walled component strain measurement point positioning program in the memory 1202, in addition to the functions mentioned above, it can also perform other functions, as can be found in the description of the corresponding method embodiments above.

[0163] Furthermore, the embodiments of the present invention do not specifically limit the type of the thin-walled component processing equipment 1200 mentioned. The thin-walled component processing equipment 1200 can be a portable thin-walled component processing device such as a mobile phone, tablet computer, personal digital assistant (PDA), wearable device, or laptop computer. Exemplary embodiments of portable thin-walled component processing devices include, but are not limited to, portable thin-walled component processing devices running iOS, Android, Microsoft, or other operating systems. The aforementioned portable thin-walled component processing device can also be other portable thin-walled component processing devices, such as a laptop computer with a touch-sensitive surface (e.g., a touch panel). It should also be understood that in some other embodiments of the present invention, the thin-walled component processing equipment 1200 may not be a portable thin-walled component processing device, but rather a desktop computer with a touch-sensitive surface (e.g., a touch panel).

[0164] Those skilled in the art will understand that all or part of the processes of the methods described in the above embodiments can be implemented by a computer program instructing related hardware (such as a processor, controller, etc.), and the computer program can be stored in a computer-readable storage medium. The computer-readable storage medium may be a disk, optical disk, read-only memory, or random access memory, etc.

[0165] The above provides a detailed description of the strain measurement point positioning method, device, and thin-walled part processing equipment provided by the present invention. Specific examples have been used to illustrate the principle and implementation of the present invention. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A method for locating strain measurement points on a thin-walled component, characterized in that, A thin-walled part strain measurement point positioning method for positioning strain measurement points in a clamping process based on a simulation thin-walled part corresponding to a thin-walled part, the method comprising: determining a plurality of candidate strain measurement points of the simulation thin-walled part; determining strain values of each of the candidate strain measurement points under the action of a preset virtual clamping force; determining a measurement point effectiveness value of each of the candidate strain measurement points according to the strain values and a strain measurement point effectiveness determination model; determining a target strain measurement point from the plurality of candidate strain measurement points according to the measurement point effectiveness value; determining a real strain measurement point of the thin-walled part according to the target strain measurement point; The strain measurement point effectiveness determination model comprises an initial clamping force sensitive sub-model and a clamping force change sensitive sub-model; determining the measurement point effectiveness value of each of the candidate strain measurement points according to the strain values and the strain measurement point effectiveness determination model comprises: determining an initial clamping force sensitive value of the candidate strain measurement point according to the strain value and the initial clamping force sensitive sub-model; determining a clamping force change sensitive value of the candidate strain measurement point according to the strain value and the clamping force change sensitive sub-model; determining the measurement point effectiveness value of the candidate strain measurement point based on the initial clamping force sensitive value and the clamping force change sensitive value.

2. The thin-walled part strain gage location method of claim 1 wherein, The method further comprises: dividing the simulation thin-walled part into a plurality of grids to obtain a plurality of grid points; obtaining a plurality of grid intersection points of the plurality of grids, and taking the plurality of grid intersection points as the plurality of candidate strain measurement points.

3. The thin-walled part strain gage location method of claim 1 wherein, The preset virtual clamping force comprises a first virtual clamping force and a second virtual clamping force, the directions of the first virtual clamping force and the second virtual clamping force are the same, and the sizes are different.

4. The thin-walled part strain gage location method of claim 1 wherein, The method further comprises: determining at least one strain sensitive region in the simulation thin-walled part according to the measurement point effectiveness value; selecting the target strain measurement point from the at least one strain sensitive region based on a preset measurement point selection rule.

5. The thin-walled part strain gage location method of claim 4 wherein, The method further comprises: determining at least one strain non-sensitive region in the simulation thin-walled part according to the measurement point effectiveness value; selecting a target non-sensitive measurement point from the at least one strain non-sensitive region based on a preset measurement point selection rule; verifying the effectiveness of the target strain measurement point according to the target non-sensitive measurement point.

6. The thin-walled part strain gage location method of claim 5 wherein, The method further comprises: obtaining a target strain value of the target strain measurement point, and determining a first deformation amount of the simulation thin-walled part according to the target strain value; obtaining a non-sensitive strain value of the target non-sensitive measurement point, and determining a second deformation amount of the simulation thin-walled part according to the non-sensitive strain value; determining a third deformation amount of the simulation thin-walled part according to the strain values of each of the candidate strain measurement points; when the first deformation amount is greater than the third deformation amount, and the third deformation amount is greater than the second deformation amount, the target strain measurement point is an effective strain measurement point.

7. The thin-walled part strain gage location method of claim 1 wherein, The method further comprises: obtaining a real strain value of the real strain measuring point, and determining a real deformation of the thin-walled part according to the real strain value; determining a simulation deformation of the simulation thin-walled part according to a target strain value of the target strain measuring point; determining whether a ratio of a deformation difference between the real deformation and the simulation deformation to the real deformation is less than a preset ratio; if the ratio is less than the preset ratio, the target strain measuring point is valid; if the ratio is greater than or equal to the preset ratio, the target strain measuring point is invalid.

8. A thin-walled part strain gage positioning apparatus, characterized by, The thin-walled part strain measuring point positioning device is suitable for the thin-walled part strain measuring point positioning method in any one of claims 1-7, and is used for positioning a strain measuring point in a clamping process based on a simulation thin-walled part corresponding to a thin-walled part. The thin-walled part strain measuring point positioning device comprises: a candidate strain measuring point determination unit configured to determine a plurality of candidate strain measuring points of the simulation thin-walled part; a strain value determination unit configured to determine a strain value of each of the candidate strain measuring points under a preset virtual clamping force; a measuring point validity value determination unit configured to determine a measuring point validity value of each of the candidate strain measuring points according to the strain value and a strain measuring point validity determination model; a target strain measuring point determination unit configured to determine a target strain measuring point in the plurality of candidate strain measuring points according to the measuring point validity value; a real strain measuring point determination unit configured to determine a real strain measuring point of the thin-walled part according to the target strain measuring point.

9. A thin-walled workpiece machining apparatus, characterized by comprising: comprise a memory and a processor, wherein the memory is configured to store a program; the processor is coupled with the memory and is configured to execute the program stored in the memory to implement the steps of the thin-walled part strain measuring point positioning method in any one of claims 1-7.

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