CN115688454A - Thin-wall part strain measuring point positioning method and device and thin-wall part machining equipment - Google Patents
Thin-wall part strain measuring point positioning method and device and thin-wall part machining equipment Download PDFInfo
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- CN115688454A CN115688454A CN202211396758.2A CN202211396758A CN115688454A CN 115688454 A CN115688454 A CN 115688454A CN 202211396758 A CN202211396758 A CN 202211396758A CN 115688454 A CN115688454 A CN 115688454A
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Abstract
The invention provides a thin-wall part strain measuring point positioning method, a device and thin-wall part processing equipment, wherein the method comprises the following steps: determining a plurality of candidate strain measuring points of the simulation thin-wall part; determining a strain value of each candidate strain measuring point under the action of a preset virtual clamping force; determining a measuring point effectiveness value of each candidate strain measuring point according to the strain value and the strain measuring point effectiveness determination model; determining target strain measuring points in the candidate strain measuring points according to the measuring point effectiveness values; and determining the real strain measuring point of the thin-wall part according to the target strain measuring point. According to the invention, the measuring point effectiveness value of each candidate strain measuring point is determined according to the strain value and the strain measuring point effectiveness determination model, and the target strain measuring point in the candidate strain measuring points is determined according to the measuring point effectiveness value, so that the uncertainty of human experience is eliminated, the reliability of the determined target strain measuring point is improved, and the reliability of the real strain measuring point is improved.
Description
Technical Field
The invention relates to the technical field of thin-wall part machining, in particular to a method and a device for positioning strain measuring points of a thin-wall part and thin-wall part machining equipment.
Background
The thin-wall part has the characteristics of higher structural performance, light weight and the like, and is widely applied to modern manufacturing industry. However, the thin-wall part has a complex structure, low rigidity and high precision requirement, and in the processing process of the thin-wall part, the deformation of the thin-wall part can be seriously influenced by the selection of a clamp and a processing technology. Furthermore, most clamping procedures are manual, which creates a number of unforeseen factors. For a long time, the machining industry is plagued by the reduction of machining accuracy caused by the unstable fixture process.
An On-machine Estimation system (On-machine Estimation) is proposed for the academic world of the problem so as to realize efficient and rapid analysis of clamp force and workpiece deformation. The system can realize the visualization of the clamping state of the workpiece and improve the processing precision of the thin-wall part. How to determine the strain measuring points of the thin-wall part is the premise of correct estimation of an on-machine estimation system, and the mode of determining the strain measuring points of the thin-wall part in the prior art is determined according to human experience. The mode of manually determining the strain measuring points of the thin-wall part leads to the technical problems that the determined strain measuring points are low in reliability and low in determination speed.
Therefore, a method and a device for positioning strain measuring points of a thin-wall part and thin-wall part processing equipment are urgently needed to be provided for quickly and accurately determining the strain measuring points of the thin-wall part.
Disclosure of Invention
In view of the above, it is necessary to provide a thin-wall part strain measuring point positioning method, a thin-wall part strain measuring point positioning device, and a thin-wall part processing apparatus, so as to solve the technical problems in the prior art that the determined thin-wall part strain measuring point has low reliability and low determination speed.
On one hand, the invention provides a thin-wall part strain measuring point positioning method, which is used for positioning a strain measuring point in a clamping process based on a simulation thin-wall part corresponding to the thin-wall part, and comprises the following steps:
determining a plurality of candidate strain measuring points of the simulation thin-wall part;
determining a strain value of each candidate strain measuring point under the action of a preset virtual clamping force;
determining a measuring point effectiveness value of each candidate strain measuring point according to the strain value and the strain measuring point effectiveness determination model;
determining target strain measuring points in the candidate strain measuring points according to the measuring point effectiveness values;
and determining the real strain measuring point of the thin-wall part according to the target strain measuring point.
In some possible implementations, the determining a plurality of candidate strain measurement points of the simulated thin-walled part includes:
carrying out mesh division on the simulation thin-walled workpiece to obtain a plurality of meshes;
and acquiring 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 measuring points.
In some possible implementation manners, 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 and different sizes.
In some possible implementation manners, the strain gauge validity determination model comprises an initial clamping force sensitivity submodel and a clamping force change sensitivity submodel; the determining of the measuring point effectiveness value of each candidate strain measuring point according to the strain value and the strain measuring point effectiveness determination model comprises the following steps:
determining an initial clamping force sensitive value of the candidate strain measuring point according to the strain value and the initial clamping force sensitive submodel;
determining a clamping force change sensitive value of the candidate strain measuring point according to the strain value and the clamping force change sensitive submodel;
determining a gauge point effectiveness value for the candidate strain gauge point based on the initial clamping force sensitive value and the clamping force change sensitive value.
In some possible implementations, the determining, according to the station validity value, a target strain station in the candidate strain stations includes:
determining at least one strain sensitive area in the simulation thin-walled part according to the measuring point effectiveness value;
and selecting the target strain measuring point from the at least one strain sensitive area based on a preset measuring point selection rule.
In some possible implementations, the thin-wall part strain measuring point positioning method further includes:
determining at least one strain non-sensitive area in the simulation thin-walled part according to the measuring point effectiveness value;
selecting target non-sensitive measuring points from the at least one strain non-sensitive area based on a preset measuring point selection rule;
and verifying the effectiveness of the target strain measuring point according to the target non-sensitive measuring point.
In some possible implementations, the verifying the validity of the target strain measurement point according to the target non-sensitive measurement point includes:
acquiring a target strain value of the target strain measuring point, and determining a first deformation of the simulation thin-walled part according to the target strain value;
acquiring a non-sensitive strain value of the target non-sensitive measuring point, and determining a second deformation of the simulation thin-walled part according to the non-sensitive strain value;
determining a third deformation amount of the simulation thin-wall part according to the strain value of each candidate strain measuring point;
and when the first deformation is greater than the third deformation and the third deformation is greater than the second deformation, the target strain measuring point is an effective strain measuring point.
In some possible implementations, the thin-wall part strain measuring point positioning method further includes:
acquiring a true strain value of the true strain measuring point, and determining the true deformation of the thin-walled part according to the true strain value;
determining the simulation deformation amount of the simulation thin-walled part according to the target strain value of the target strain measuring point;
judging whether the ratio of the deformation difference value of the real deformation and the simulation deformation to the real deformation is smaller than a preset ratio or not; if the ratio is smaller than the preset ratio, the target strain measuring point is effective; and if the ratio is greater than or equal to the preset ratio, the target strain measuring point is invalid.
On the other hand, the invention also provides a thin-wall part strain measuring point positioning device, which is used for positioning the strain measuring point in the clamping process based on the simulated thin-wall part corresponding to the thin-wall part, and the thin-wall part strain measuring point positioning device comprises:
the candidate strain measuring point determining unit is used for determining a plurality of candidate strain measuring points of the simulation thin-wall part;
the strain value determining unit is used for determining the strain value of each candidate strain measuring point under the action of a preset virtual clamping force;
the measuring point effectiveness value determining unit is used for determining the measuring point effectiveness value of each candidate strain measuring point according to the strain value and the strain measuring point effectiveness determining model;
the target strain measuring point determining unit is used for determining target strain measuring points in the candidate strain measuring points according to the measuring point effectiveness values;
and the real strain measuring point determining unit is used for determining the real strain measuring point of the thin-wall part according to the target strain measuring point.
In another aspect, the present invention further provides a thin-wall part machining apparatus, including a memory and a processor, wherein,
the memory is used for storing programs;
the processor is coupled with the memory and is configured to execute the program stored in the memory to implement the steps in the thin-wall part strain measurement point positioning method in any implementation manner.
The beneficial effects of adopting the above embodiment are: compared with the mode of determining the real strain measuring points through manual experience in the prior art, the thin-wall part strain measuring point positioning method provided by the invention has the advantages that the strain measuring point effectiveness determining model is provided, the measuring point effectiveness value of each candidate strain measuring point can be determined according to the strain value and the strain measuring point effectiveness determining model, the target strain measuring points in a plurality of candidate strain measuring points are determined according to the measuring point effectiveness values, the uncertainty of the manual experience is eliminated, the reliability of the determined target strain measuring points is improved, and the reliability of the real strain measuring points is improved. Furthermore, the real strain measuring point can be determined according to the provided strain measuring point effectiveness determination model and the determined strain value of the candidate strain measuring point, manual excessive participation in the calculation and measurement process is not needed, and the determination speed of the real strain measuring point is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic flow chart of an embodiment of a thin-wall part strain measurement point positioning method provided by the invention;
FIG. 2 is a schematic flow chart of one embodiment of S101 of FIG. 1;
FIG. 3 is a schematic structural view of one embodiment of a thin-walled member provided by the present invention;
FIG. 4 is a schematic flow chart diagram illustrating one embodiment of S103 of FIG. 1 according to the present invention;
FIG. 5 is a schematic flow chart of one embodiment of S104 of FIG. 1;
FIG. 6 is a schematic structural diagram of an embodiment of a strain sensitive region sensitive along the X-axis provided by the present invention;
FIG. 7 is a structural diagram of an embodiment of a strain sensitive region sensitive along the Y-axis provided by the present invention;
FIG. 8 is a schematic flow chart illustrating one embodiment of verifying the validity of target strain gauges according to the present invention;
FIG. 9 is a flowchart illustrating an embodiment of S803 of FIG. 8 according to the present invention;
FIG. 10 is a schematic flow chart illustrating another embodiment of verifying the validity of target strain gauges according to the present invention;
FIG. 11 is a schematic structural view of an embodiment of a thin-wall part strain measuring point positioning device provided by the invention;
fig. 12 is a structural schematic diagram of one embodiment of thin-wall part machining equipment provided by the invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
References to "first", "second", etc. in embodiments of the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to the number of technical features indicated. Thus, a technical feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the invention. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
The invention provides a thin-wall part strain measuring point positioning method, a thin-wall part strain measuring point positioning device and thin-wall part processing equipment, which are respectively explained below.
Fig. 1 is a schematic flow chart of an embodiment of a thin-walled part strain measurement point positioning method provided by the present invention, which is used for positioning a strain measurement point in a clamping process based on a simulated thin-walled part corresponding to the thin-walled part, and as shown in fig. 1, the thin-walled part strain measurement point positioning method includes:
s101, determining a plurality of candidate strain measuring points of the simulation thin-walled part;
s102, determining a strain value of each candidate strain measuring point under the action of a preset virtual clamping force;
s103, determining a measuring point effectiveness value of each candidate strain measuring point according to the strain value and the strain measuring point effectiveness determination model;
s104, determining target strain measuring points in the candidate strain measuring points according to the measuring point effectiveness values;
and S105, determining a real strain measuring point of the thin-wall part according to the target strain measuring point.
Compared with the prior art, the thin-wall part strain measuring point positioning method provided by the embodiment of the invention has the advantages that compared with the mode of determining the real strain measuring points through artificial experience in the prior art, the strain measuring point effectiveness determining model is provided, the measuring point effectiveness value of each candidate strain measuring point can be determined according to the strain value and the strain measuring point effectiveness determining model, the target strain measuring points in the candidate strain measuring points are determined according to the measuring point effectiveness values, the uncertainty of the artificial experience is eliminated, the reliability of the determined target strain measuring points is improved, and the reliability of the real strain measuring points is improved. Furthermore, according to the provided strain measuring point effectiveness determination model and the determined strain values of the candidate strain measuring points, the real strain measuring points can be determined, manual excessive participation in the calculation and measurement process is not needed, and the determination speed of the real strain measuring points is improved.
The simulation thin-wall part in step S101 may be a virtual model generated in simulation software according to the thin-wall part. The simulation software may be Finite element simulation (FEM) software including, but not limited to, ANSYS software, ADINA software, MSC software, or ABAQUS software.
The strain measurement point validity determination model in step S103 refers to a calculation model for determining whether each candidate strain measurement point can be used as a target strain measurement point, that is: and determining target strain measuring points in the candidate strain measuring points according to the measuring point effectiveness values determined by the strain measuring point effectiveness model.
It should be noted that: the strain measurement point effectiveness determination model can be constructed according to parameters related to target strain measurement points obtained from working experience, such as: the target strain measuring point refers to a measuring point which has large strain and is sensitive to the change of clamping force. Parameters related to the magnitude of the strain and the sensitivity to changes in strain force should be included in the strain gauge validity determination model.
It should be understood that: the strain measuring point effectiveness determination model can be built synchronously when step S103 is executed, or can be built in advance, and is stored in a storage medium, and the strain measuring point effectiveness determination model is called from the storage medium when step S103 is executed.
In some embodiments of the present invention, as shown in fig. 2, step S101 includes:
s201, carrying out grid division on the simulation thin-walled workpiece to obtain a plurality of grids;
s202, acquiring a plurality of grid intersections of the grids, and taking the grid intersections as a plurality of candidate strain measurement points.
In step S201, the simulation thin-walled part may be subjected to meshing according to a meshing unit built in the simulation software, or may be subjected to meshing according to professional meshing software.
Specifically, the meshing software includes, but is not limited to ICEM-CFD, global, gridggen, gambit, CFX-build, CFD-Geom, and the like.
It should be noted that: the gridding needs to be based on boundary conditions, and the boundary conditions include but are not limited to materials of the thin-wall part, materials of the clamp, grid sizes, contact types of the thin-wall part and the clamp, and the like.
Since the real strain measurement point should be a point having a large strain and being very sensitive to a change 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 and different magnitudes.
According to the embodiment of the invention, the first virtual clamping force and the second virtual clamping force are set to have the same direction and different sizes, so that the real strain measuring point sensitive to the change of the clamping force can be determined, and the reliability of the determined real strain measuring point is further improved.
It should be noted that: the preset virtual clamping force can also comprise other virtual clamping forces with different directions from the first virtual clamping force and the second virtual clamping force, and the specific setting of the virtual clamping forces with different directions is determined according to the structure of the thin-wall part. If the thin-walled part is a one-dimensional thin-walled part, virtual clamping force in one direction is only needed, if the thin-walled part is a two-dimensional thin-walled part, virtual clamping force in two directions is needed, and if the thin-walled part is a three-dimensional thin-walled part, virtual clamping force in three directions is needed.
In a specific embodiment of the present invention, as shown in fig. 3, the thin-walled part is a two-dimensional thin-walled part I, which is clamped by a toe-shaped clamp II, a side clamp III, a plane positioner IV, a toe-shaped positioner V and a workbench VI, the virtual clamping force includes a first-direction virtual clamping force F1 along the negative direction of the Y-axis and a second-direction virtual clamping force F2 along the negative direction of the X-axis, and 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:
TABLE 1 virtual clamping force settings
In a specific embodiment of the present invention, the boundary conditions are shown in table 2:
TABLE 2 boundary conditions
In some embodiments of the invention, the strain gauge validity determination model comprises an initial clamping force sensitivity submodel and a clamping force change sensitivity submodel; then, as shown in fig. 4, step S103 includes:
s401, determining an initial clamping force sensitive value of a candidate strain measuring point according to the strain value and the initial clamping force sensitive submodel;
s402, determining a clamping force change sensitive value of the candidate strain measuring point according to the strain value and the clamping force change sensitive submodel;
and S403, determining a measuring point effectiveness value of the candidate strain measuring point based on the initial clamping force sensitive value and the clamping force change sensitive value.
According to the embodiment of the invention, the strain measuring point effectiveness determining model comprises the initial clamping force sensitive submodel and the clamping force change sensitive submodel, so that the target strain measuring point which is sensitive to the initial clamping force and very sensitive to the clamping force change can be determined, and the reliability of the target strain measuring point is further improved.
In the specific embodiment of the invention, the strain measuring point effectiveness determination model is as follows:
EOP i ＝EOP 1i +EOP 2i
δS i ＝max k∈(1,M) (ΔS i,k -ΔS i,n )
in the formula, EOP i Measuring point validity values of the ith candidate strain measuring point; EOP 1i The initial clamping force sensitive value of the ith candidate strain measuring point is obtained; EOP 2i The clamping force change sensitive value of the ith candidate strain measuring point is obtained; delta S i,n The degree of the strain of the nth time node of the ith candidate strain measuring point along with the change of the maximum clamping force is obtained; delta S j,n The degree of the strain of the nth time node of the jth candidate strain measuring point along with the change of the maximum clamping force is obtained; n is the total number of candidate strain measuring points; delta S i The process coefficient for resisting the increase of the maximum clamping force for the ith candidate strain measuring point; delta S j The process coefficient for resisting the increase of the maximum clamping force for the jth candidate strain measuring point; m is the total number of virtual clamping forces; delta S i,k The degree of the strain of the ith candidate strain measuring point along with the change of the maximum clamping force under the action of the kth group of virtual clamping force.
In some embodiments of the present invention, as shown in fig. 5, step S104 comprises:
s501, determining at least one strain sensitive area in the simulated thin-walled part according to the measuring point effectiveness value;
and S502, selecting target strain measuring points from at least one strain sensitive area based on a preset measuring point selection rule.
Wherein, step S501 specifically includes: and giving different colors or different gray scales to each candidate strain measuring point according to the sequence of the effective values of the measuring points from large to small so as to display the simulation thin-wall part on the simulation software, and determining at least one strain sensitive area according to different colors or different gray scale sets.
In a specific embodiment of the present invention, the thin-wall part is the thin-wall part shown in fig. 3, and as shown in fig. 6, the simulated thin-wall part collectively includes 6 strain sensitive regions sensitive along the X-axis direction, and the numbers 1, 2, 3, 4, 5, and 6 represent the 6 strain sensitive regions having stronger sensitivity to a certain degree, respectively. As shown in fig. 7, the simulation thin-wall part includes 6 strain sensitive regions sensitive in the Y-axis direction, and the 6 strain sensitive regions with stronger sensitivity to several are also represented by numbers 1, 2, 3, 4, 5, and 6, respectively.
In an embodiment of the present invention, the predetermined measurement point selection rule in step S502 is:
(1) Target strain measuring points cannot be selected from the clamping area;
(2) Target strain measurement points cannot be selected from the region close to the edge of the thin-walled structure;
(3) Target strain measuring points cannot be selected from the area to be processed;
(4) The table surface with the target as the positioning reference is not suitable for selection.
By setting the 4 measuring point selection rules, unreasonable selection of target strain measuring points can be avoided, and therefore the reliability of the determined target strain measuring points can be further improved.
It should be understood that: the number of the target strain measuring points can be selected according to an actual application scene, in a specific embodiment of the invention, one target strain measuring point sensitive along the X-axis direction and one target strain measuring point sensitive along the Y-axis direction are respectively selected, the number of the target strain measuring point sensitive along the X-axis direction is (135409,139415), the number of the target strain measuring point sensitive along the Y-axis direction is (113271,134859), and the number in the number represents the grid intersection point number along the X-axis and the Y-axis.
In order to avoid the technical problem that an error occurs in the simulation process of determining the target strain measuring points, or the selected target strain measuring points are unreasonable due to the unreasonable target strain measuring points selected in the strain sensitive area, so that the deformation estimation of the thin-wall part determined by the real strain measuring points is inaccurate, in some embodiments of the invention, as shown in fig. 8, the thin-wall part strain measuring point positioning method further comprises:
s801, determining at least one strain non-sensitive area in the simulation thin-walled part according to the measuring point effectiveness value;
s802, selecting target non-sensitive measuring points from at least one strain non-sensitive area based on a preset measuring point selection rule;
and S803, verifying the effectiveness of the target strain measuring point according to the target non-sensitive measuring point.
According to the embodiment of the invention, the target non-sensitive measuring points are used as the comparison of the target strain measuring points to verify the effectiveness of the target strain measuring points, so that the reasonability and the reliability of the determined target strain measuring points can be improved.
It should be understood that: the strain insensitive region in step S801 may be other regions of the simulated thin-walled part except for the strain sensitive region. The measurement point selection rule preset in step S802 is the same as the measurement point selection rule preset in step S502, and is not described herein again.
In the specific embodiment of the invention, a target non-sensitive measuring point insensitive along the X-axis direction and a target non-sensitive measuring point insensitive along the Y-axis direction are respectively selected, the number of the target non-sensitive measuring point insensitive along the X-axis direction is (134918,139512), and the number of the target non-sensitive measuring point insensitive along the Y-axis direction is (114997,135305).
In some embodiments of the present invention, as shown in fig. 9, step S803 includes:
s901, acquiring a target strain value of a target strain measuring point, and determining a first deformation of the simulation thin-walled part according to the target strain value;
s902, acquiring a non-sensitive strain value of a target non-sensitive measuring point, and determining a second deformation of the simulation thin-walled part according to the non-sensitive strain value;
s903, determining a third deformation amount of the simulation thin-walled part according to the strain value of each candidate strain measuring point;
and S904, when the first deformation is larger than the third deformation and the third deformation is larger than the second deformation, the target strain measuring point is an effective strain measuring point.
This is due to: when the first deformation is larger than the third deformation and the third deformation is larger than the second deformation, the target strain measuring point is a strain measuring point which is sensitive to the initial clamping force and sensitive to the change of the clamping force, namely the target strain measuring point is an effective strain measuring point, and the target strain measuring point can be used as a strain measuring point in an on-machine estimation system. Therefore, the effectiveness and the reasonableness of the determined target strain measuring points can be improved by determining the first deformation, the second deformation and the third deformation and determining whether the target strain measuring points are effective strain measuring points according to the first deformation, the second deformation and the third deformation.
It should be noted that: the first deformation amount can be divided into a plurality of sub-deformation amounts according to the actual structure of the thin-wall part, in the specific embodiment of the present invention, taking the thin-wall part in fig. 3 as an example, the first deformation amount includes A, B, C, D, E five sub-deformation amounts, and similarly, the second deformation amount and the third deformation amount also include A, B, C, D, E five sub-deformation amounts, respectively.
In a specific embodiment of the present invention, the first deformation amount, the second deformation amount, and the third deformation amount are respectively shown in table 3:
TABLE 3 deformation of simulated thin-walled parts
| A[μm] | B[μm] | C[μm] | D[μm] | E[μm] | |
| First amount of deformation | -29.39 | -8.63 | -280.39 | -296.81 | -8.43 |
| Second amount of deformation | -14.68 | -5.36 | -227.3 | -226.3 | -5.34 |
| Third amount of deformation | -21.54 | -8.43 | -271.83 | -265.79 | -7.13 |
Wherein the symbols in table 3 represent directions. As can be seen from table 3: in the specific embodiment of the invention, the first deformation is greater than the third deformation, the third deformation is greater than the second deformation, and the difference between the first deformation and the second deformation is small, so that the effectiveness of the target strain measuring point determined by the embodiment of the invention is verified, and the effectiveness of the thin-wall part strain measuring point positioning method provided by the embodiment of the invention is verified.
In order to avoid the technical problem that the accuracy of the simulated target strain measuring point is not high due to the fact that simulation software is not completely the same as an actual scene and is over-ideal, in some embodiments of the present invention, as shown in fig. 10, the thin-wall part strain measuring point positioning method further includes:
s1001, acquiring a true strain value of a true strain measuring point, and determining a true deformation of the thin-walled part according to the true strain value;
s1002, determining the simulation deformation amount of the simulation thin-walled part according to the target strain value of the target strain measuring point;
s1003, judging whether the ratio of the deformation difference value of the real deformation and the simulation deformation to the real deformation is smaller than a preset ratio or not; if the ratio is smaller than the preset ratio, the target strain measuring point is effective; and if the ratio is greater than or equal to the preset ratio, the target strain measuring point is invalid.
According to the embodiment of the invention, the effectiveness of the target strain measuring point is verified by acquiring the real deformation of the thin-wall part, so that the technical problem of unreliable target strain measuring points caused by single simulation verification can be avoided, and the effectiveness of the target strain measuring point determined by simulation is further verified by the real deformation, so that the reliability of the target strain measuring point can be further improved.
It should be understood that: in step S1001, a contact strain sensor may be attached to a true strain measurement point to obtain a true strain value, or a non-contact strain sensor may be used to obtain a true strain value remotely.
The contact type strain sensor may be a strain gauge type sensor, and the non-contact type strain sensor may be a laser strain sensor.
It should also be understood that: the preset ratio may be set according to an actual application scenario or an empirical value, and in a specific embodiment of the present invention, the preset ratio is 20%.
In the embodiment of the present invention, taking the thin-wall part in fig. 3 as an example, the real deformation and the simulated deformation are shown in table 4:
TABLE 4 true and simulated deformations
| A[μm] | B[μm] | C[μm] | D[μm] | E[μm] | |
| Simulated deformation | -22.8 | -8.1 | -273 | -274.3 | -7.45 |
| True deflection | -27 | -9.3 | -284 | -280 | -8.57 |
As can be seen from Table 4: the ratio of the difference between the simulated deformation and the real deformation to the real deformation is 15.6% at most and is smaller than the preset ratio, the effectiveness of the target strain measuring point determined by the embodiment of the invention is verified, and therefore the effectiveness of the thin-wall part strain measuring point positioning method provided by the embodiment of the invention is verified.
It should be noted that: in order to improve the effectiveness of the determined target strain measuring points to the greatest extent, the steps S901 to S904 and the steps S1001 to S1003 can be executed simultaneously to verify the effectiveness of the target strain measuring points, so as to ensure the effectiveness of the target strain measuring points, thereby improving the reliability of the determined real strain measuring points.
In order to better implement the thin-wall part strain measuring point positioning method in the embodiment of the present invention, on the basis of the thin-wall part strain measuring point positioning method, correspondingly, as shown in fig. 11, the embodiment of the present invention further provides a thin-wall part strain measuring point positioning device, where the thin-wall part strain measuring point positioning device 1100 includes:
a candidate strain measuring point determining unit 1101, configured to determine a plurality of candidate strain measuring points of the simulation thin-walled workpiece;
a strain value determining unit 1102, configured to determine a strain value of each candidate strain measuring point under a preset virtual clamping force;
a measuring point effectiveness value determining unit 1103, configured to determine a measuring point effectiveness value of each candidate strain measuring point according to the strain value and the strain measuring point effectiveness determination model;
a target strain measuring point determining unit 1104, configured to determine a target strain measuring point in the multiple candidate strain measuring points according to the measuring point validity value;
and a real strain measuring point determining unit 1105, configured to determine a real strain measuring point of the thin-wall part according to the target strain measuring point.
The thin-wall part strain measuring point positioning device 1100 provided in the above-mentioned embodiment can implement the technical solutions described in the above-mentioned thin-wall part strain measuring point positioning method embodiments, and the specific implementation principles of the above-mentioned modules or units can refer to the corresponding contents in the above-mentioned thin-wall part strain measuring point positioning method embodiments, and will not be described herein again.
As shown in fig. 12, the present invention further provides a thin-wall part processing apparatus 1200. The thin-walled workpiece machining apparatus 1200 includes a processor 1201, a memory 1202, and a display 1203. Fig. 12 shows only some of the components of thin wall part machining apparatus 1200, but it should be understood that not all of the shown components are required and that more or fewer components may be implemented instead.
In some embodiments, the processor 1201 may be a single server or a group of servers. The server groups may be centralized or distributed. In some embodiments, the processor 1201 may be local or remote. In some embodiments, the processor 1201 may be implemented in a cloud platform. In an embodiment, the cloud platform may include a private cloud, a public cloud, a hybrid cloud, a community cloud, a distributed cloud, an intra-site, a multi-cloud, and the like, or any combination thereof.
The memory 1202 may be an internal storage unit of the thin-wall part machining apparatus 1200 in some embodiments, such as a hard disk or memory of the thin-wall part machining apparatus 1200. The memory 1202 may also be an external storage device of the thin-wall part processing apparatus 1200 in other embodiments, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like provided on the thin-wall part processing apparatus 1200.
Further, the memory 1202 may also include both internal and external storage units of the thin-walled workpiece machining apparatus 1200. The memory 1202 is used for storing application software and various data for installing the thin-wall part machining apparatus 1200.
The display 1203 may be an LED display, a liquid crystal display, a touch-sensitive liquid crystal display, an OLED (Organic Light-Emitting Diode) touch panel, or the like in some embodiments. The display 1203 is used to display information at the thin wall part machining apparatus 1200 and to display a visual user interface. The components 1201-1203 of the thin wall part processing apparatus 1200 communicate with each other via a system bus.
In some embodiments of the present invention, when processor 1201 executes the thin-walled workpiece strain gauge positioning program in memory 1202, the following steps may be implemented:
determining a plurality of candidate strain measuring points of the simulation thin-wall part;
determining a strain value of each candidate strain measuring point under the action of a preset virtual clamping force;
determining a measuring point effectiveness value of each candidate strain measuring point according to the strain value and the strain measuring point effectiveness determination model;
determining target strain measuring points in the candidate strain measuring points according to the measuring point effectiveness values;
and determining a real strain measuring point of the thin-wall part according to the target strain measuring point.
It should be understood that: when the processor 1201 executes the thin-wall part strain measurement point positioning program in the memory 1202, in addition to the above functions, other functions may be implemented, which may be specifically referred to in the foregoing description of the corresponding method embodiments.
Further, the thin-walled workpiece machining apparatus 1200 according to the embodiment of the present invention is not specifically limited in type, and the thin-walled workpiece machining apparatus 1200 may be a portable thin-walled workpiece machining apparatus such as a mobile phone, a tablet computer, a Personal Digital Assistant (PDA), a wearable apparatus, and a laptop computer (laptop). Exemplary embodiments of portable thin wall part machining devices include, but are not limited to, portable thin wall part machining devices that carry IOS, android, microsoft, or other operating systems. The portable thin wall part machining equipment can also be other portable thin wall part machining equipment, such as laptop computers (laptop) with touch-sensitive surfaces (e.g., touch panels) and the like. It should also be understood that in other embodiments of the present invention, thin wall part machining apparatus 1200 may not be a portable thin wall part machining apparatus, but rather a desktop computer with a touch-sensitive surface (e.g., a touch panel).
Those skilled in the art will appreciate that all or part of the flow of the method implementing the above embodiments may be implemented by instructing relevant hardware (such as a processor, a controller, etc.) by a computer program, and the computer program may be stored in a computer readable storage medium. The computer readable storage medium is a magnetic disk, an optical disk, a read-only memory or a random access memory.
The thin-wall part strain measuring point positioning method, the thin-wall part strain measuring point positioning device and the thin-wall part machining equipment provided by the invention are described in detail, a specific example is applied in the description to explain the principle and the implementation mode of the invention, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for those skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed, and in summary, the content of the present specification should not be construed as limiting the present invention.
Claims (10)
1. A thin-wall part strain measuring point positioning method is characterized by being used for positioning a strain measuring point in a clamping process based on a simulated thin-wall part corresponding to a thin-wall part, and the thin-wall part strain measuring point positioning method comprises the following steps:
determining a plurality of candidate strain measuring points of the simulation thin-wall part;
determining a strain value of each candidate strain measuring point under the action of a preset virtual clamping force;
determining a measuring point effectiveness value of each candidate strain measuring point according to the strain value and the strain measuring point effectiveness determination model;
determining target strain measuring points in the candidate strain measuring points according to the measuring point effectiveness values;
and determining the real strain measuring point of the thin-wall part according to the target strain measuring point.
2. The thin-walled part strain gauge point positioning method of claim 1, wherein the determining of the plurality of candidate strain gauge points of the simulated thin-walled part comprises:
carrying out mesh division on the simulation thin-wall part to obtain a plurality of meshes;
and acquiring 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 measuring points.
3. A thin-walled workpiece strain gauge positioning method as recited in claim 1, wherein the predetermined virtual clamping force comprises 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 and different magnitudes.
4. The thin-wall part strain measuring point positioning method according to claim 1, wherein the strain measuring point effectiveness determination model comprises an initial clamping force sensing submodel and a clamping force change sensing submodel; the determining of the measuring point effectiveness value of each candidate strain measuring point according to the strain value and the strain measuring point effectiveness determination model comprises the following steps:
determining an initial clamping force sensitive value of the candidate strain measuring point according to the strain value and the initial clamping force sensitive submodel;
determining a clamping force change sensitive value of the candidate strain measuring point according to the strain value and the clamping force change sensitive submodel;
determining a gauge point effectiveness value for the candidate strain gauge point based on the initial clamping force sensitive value and the clamping force change sensitive value.
5. The thin-wall part strain measuring point positioning method according to claim 1, wherein the determining of target strain measuring points in the candidate strain measuring points according to the measuring point effectiveness values comprises:
determining at least one strain sensitive area in the simulation thin-walled part according to the measuring point effectiveness value;
and selecting the target strain measuring point from the at least one strain sensitive area based on a preset measuring point selection rule.
6. The thin-walled member strain gauge point positioning method of claim 5, wherein the thin-walled member strain gauge point positioning method further comprises:
determining at least one strain non-sensitive area in the simulation thin-walled part according to the measuring point effectiveness value;
selecting target non-sensitive measuring points from the at least one strain non-sensitive area based on a preset measuring point selection rule;
and verifying the effectiveness of the target strain measuring point according to the target non-sensitive measuring point.
7. The thin-wall part strain measuring point positioning method according to claim 6, wherein verifying the effectiveness of the target strain measuring point according to the target non-sensitive measuring point comprises:
acquiring a target strain value of the target strain measuring point, and determining a first deformation of the simulation thin-walled part according to the target strain value;
acquiring a non-sensitive strain value of the target non-sensitive measuring point, and determining a second deformation of the simulation thin-walled part according to the non-sensitive strain value;
determining a third deformation amount of the simulation thin-wall part according to the strain value of each candidate strain measuring point;
and when the first deformation is greater than the third deformation and the third deformation is greater than the second deformation, the target strain measuring point is an effective strain measuring point.
8. The thin-walled part strain gauge point positioning method of claim 1, wherein the thin-walled part strain gauge point positioning method further comprises:
acquiring a true strain value of the true strain measuring point, and determining the true deformation of the thin-walled part according to the true strain value;
determining the simulation deformation amount of the simulation thin-walled part according to the target strain value of the target strain measuring point;
judging whether the ratio of the deformation difference value of the real deformation and the simulation deformation to the real deformation is smaller than a preset ratio or not; if the ratio is smaller than the preset ratio, the target strain measuring point is effective; and if the ratio is greater than or equal to the preset ratio, the target strain measuring point is invalid.
9. The thin-wall part strain measuring point positioning device is characterized by being used for positioning a strain measuring point in the clamping process based on a simulation thin-wall part corresponding to the thin-wall part, and the thin-wall part strain measuring point positioning device comprises:
the candidate strain measuring point determining unit is used for determining a plurality of candidate strain measuring points of the simulation thin-wall part;
the strain value determining unit is used for determining the strain value of each candidate strain measuring point under the action of a preset virtual clamping force;
the measuring point effectiveness value determining unit is used for determining the measuring point effectiveness value of each candidate strain measuring point according to the strain value and the strain measuring point effectiveness determining model;
the target strain measuring point determining unit is used for determining target strain measuring points in the candidate strain measuring points according to the measuring point effectiveness values;
and the real strain measuring point determining unit is used for determining the real strain measuring point of the thin-wall part according to the target strain measuring point.
10. Thin-walled workpiece processing equipment is characterized by comprising a memory and a processor, wherein,
the memory is used for storing programs;
the processor is coupled with the memory and is used for executing the program stored in the memory so as to realize the steps in the thin-wall part strain measuring point positioning method in any one of the claims 1 to 8.
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