Numerical simulation based method, device and equipment for correcting as-cast dimensions of a casting

Abstract

The application discloses a kind of based on numerical simulation's casting conformal size correction method, device and equipment, method includes: obtaining the casting grid model of the casting to be corrected;According to the casting grid model, casting thermal stress simulation is carried out, the deformation of each casting node of the casting grid model is obtained, and then the deformed grid model is obtained;Target node on casting grid model is obtained, according to the first coordinate of the target node in the casting grid model and the second coordinate of its deformed simulated node in the deformed grid model, the deformation of the target node is classified, and the deformation category of the target node is obtained;According to the deformation category of the target node, corresponding reference point is selected in the casting grid model, and according to the current design size of each reference point, target node and simulated node, the actual design parameter of target node is calculated, to correct the size of the target node.

Description

Technical Field

[0001] This invention relates to the field of numerical simulation, and in particular to a method, apparatus, and equipment for correcting the conformal dimensions of castings based on numerical simulation. Background Technology

[0002] Casting is widely used in various fields of industrial production. With the development of casting production technology, higher requirements have been put forward for the quality of castings. Due to the solidification shrinkage of castings, there is often a large deviation between the design dimensions and the actual dimensions. An important goal of optimizing the casting process is to obtain casting blanks with higher surface precision, which can significantly reduce the cost of subsequent machining and improve production efficiency.

[0003] One important way to improve the dimensional accuracy of castings is to rationally design the casting dimensions and reasonably enlarge the target casting dimensions so that the designed casting will have higher dimensional accuracy after the filling and solidification process. This process is called casting dimension correction.

[0004] The most common method for correcting casting dimensions is the experience-based compensation method. This involves manually enlarging or reducing the casting dimensions based on empirical values. These empirical values ​​are generally determined based on the production experience of the actual production staff. During subsequent trial production, casting dimensions are continuously measured, and adjustments are made to local dimensions based on discrepancies in the actual trial production dimensions. Furthermore, some dimensional corrections take into account the casting material, referencing the solidification shrinkage rate and solidification cooling rate of the casting material to determine the dimensional correction values.

[0005] The above method has the following three main drawbacks:

[0006] (1) The design based on experience depends on the technical level of the designer. Even if the solidification shrinkage rate of the casting material is taken into account, there is a lack of targeted compensation formulas. A large number of trial productions and repeated debugging are often required to improve the design accuracy, resulting in a high production cycle and production cost.

[0007] (2) Different optimal compensation values ​​often appear for multiple key dimensions of castings. When there are deviations in multiple key dimensions, it is difficult to obtain accurate compensation values.

[0008] (3) Experience compensation focuses on the overall size in actual operation, and pays less attention to the local size of the casting. Therefore, the accuracy of the local size of the casting is not high and the fluctuation is large. Summary of the Invention

[0009] In view of this, the purpose of the present invention is to provide a method, apparatus and equipment for correcting the conformal dimensions of castings based on numerical simulation, so as to solve the above problems.

[0010] This invention provides a method for correcting the conformal dimensions of castings based on numerical simulation, comprising:

[0011] Obtain the casting mesh model of the casting to be corrected;

[0012] The casting thermal stress is simulated based on the casting mesh model to obtain the deformation of each casting node in the casting mesh model, thereby obtaining a deformed mesh model.

[0013] Obtain the target node on the casting mesh model. Based on the first coordinate of the target node on the casting mesh model and the second coordinate of its deformed simulated node on the deformed mesh model, classify the deformation of the target node to obtain the deformation category of the target node.

[0014] Based on the deformation category of the target node, a corresponding reference point is selected in the casting mesh model. Then, based on the coordinates of each reference point, the target node, and the simulated node, the inverse deformation amount of the target node is calculated to correct the coordinates of the target node.

[0015] Preferably, the target node on the casting mesh model is obtained, and the deformation of the target node is classified according to the first coordinate of the target node on the casting mesh model and the second coordinate of its deformed simulated node on the deformed mesh model. The deformation category of the target node is specifically obtained as follows:

[0016] Obtain the first coordinates of the target node located within the casting mesh model;

[0017] Obtain the second coordinates of the simulated point of the target node on the deformable mesh model after the casting thermal stress simulation;

[0018] If the second coordinate of the target node in the deformed simulated node is within the range of the casting mesh model, then the deformation category of the target node is marked as direct shrinkage;

[0019] If the first coordinate of the target node is within the range of the casting deformation mesh model, then the deformation category of the target node is marked as direct expansion;

[0020] Otherwise, mark the deformation category of the target node as relative offset.

[0021] Preferably, according to the deformation category of the target node, a corresponding reference point is selected in the casting mesh model, and the inverse deformation amount of the target node is calculated based on the coordinates of each reference point, the target node, and the simulated node, so as to perform size correction on the target node based on the inverse deformation amount.

[0022] Based on the deformation type of the target node A1, determine the first reference point B1 of the target node A1 on the casting mesh model;

[0023] Obtain the second coordinate b1 of the first reference point B1 in the deformable mesh model;

[0024] Assuming the target node for anti-deformation is A2, and the second coordinate of A2 in the deformable mesh model is a2, according to the definition of casting anti-deformation, a2 coincides with the target node A1. That is, the target node A2 is generated as point A1 in the deformable mesh model after the casting thermal stress simulation.

[0025] Assume that the anti-deformation target node of the first reference point B1 is B2, and its second coordinate in the deformed mesh model is b2, which coincides with B1;

[0026] Based on the first coordinates A1 and second coordinates a1 of the target node A1 and the first coordinates B1 and second coordinates b1 of the first reference point B1, the coordinates of the target node A1 are corrected.

[0027] Preferably, when the deformation type is direct contraction, the second coordinate of the deformed target node A1 is selected as the coordinate of the first reference point B1;

[0028] The coordinates of the target correction node A2 are represented as follows:

[0029] in, The variable is the inverse deformation amount, and a2 is the coordinate of the simulated node a2 corresponding to the target correction node A2, and the coordinates of the simulated node a2 are the same as the coordinates of the target node A1.

[0030] Preferably, when the deformation type is direct extension, the first coordinate of the target node A1 before deformation is selected as the coordinate of the second reference point b1;

[0031] The coordinates of the target correction point A2 are represented as follows:

[0032]

[0033] Preferably, when the deformation type is relative offset, the nearest direct shrinkage point on the casting mesh model is selected as the first reference point B1; wherein, the nearest direct shrinkage point satisfies that its own deformation type is direct shrinkage, and it is closest to the target node A1;

[0034] The coordinates of the target correction point A2 are then expressed as:

[0035]

[0036] Preferably, it further includes:

[0037] The dimensions of the casting are corrected by traversing all nodes of the casting model and performing calculations.

[0038] This invention also provides a numerical simulation-based casting conformal dimension correction device, which includes:

[0039] The model acquisition unit is used to acquire the casting mesh model of the casting to be corrected.

[0040] The stress simulation unit is used to simulate casting thermal stress based on the casting mesh model, obtain the deformation of each casting node in the casting mesh model, and then obtain the deformed mesh model.

[0041] The deformation classification unit is used to obtain the target node on the casting mesh model, and classify the deformation of the target node according to the first coordinate of the target node on the casting mesh model and the second coordinate of its deformed simulated node on the deformed mesh model to obtain the deformation category of the target node.

[0042] The correction unit is used to select corresponding reference points in the casting mesh model according to the deformation category of the target node, and calculate the actual coordinates of the target node according to the coordinates of each reference point, the target node, and the simulated node, so as to correct the size of the target node.

[0043] This invention also provides a casting conformal dimension correction device based on numerical simulation, which includes a memory and a processor. The memory stores a computer program that can be executed by the processor to implement the casting conformal dimension correction method based on numerical simulation as described above.

[0044] In summary, this embodiment has the following technical effects:

[0045] 1) By using numerical simulation, the error verification cost of trial production can be eliminated, the actual production cycle can be shortened significantly, and the efficiency of casting design can be improved.

[0046] 2) Targeted compensation design for each casting node, while taking into account multiple key dimensions and local casting details;

[0047] 3) High compensation accuracy and short design cycle, which greatly improves the design quality of casting dimensions. Attached Figure Description

[0048] To more clearly illustrate the technical solution of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, the 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.

[0049] Figure 1This is a flowchart illustrating the method for correcting the conformal dimensions of castings based on numerical simulation, provided in the first embodiment of the present invention.

[0050] Figures 2(a)-2(d) This is a schematic diagram showing the deformation of the casting joints.

[0051] Figures 3(a)-3(c) These are schematic diagrams illustrating the deformation of casting joints under gradual solidification shrinkage in three different scenarios.

[0052] Figure 4 This is a schematic diagram of the casting model of the truss component.

[0053] Figure 5 This is a schematic diagram of the mean absolute error and quasi-error value of the surface nodes of the truss component.

[0054] Figure 6 This is a schematic diagram of the structure of the casting conformal dimension correction device based on numerical simulation provided in the second embodiment of the present invention. Detailed Implementation

[0055] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0056] Please see Figure 1 The first embodiment of the present invention provides a method for correcting the conformal dimensions of castings based on numerical simulation, which can be executed by a numerical simulation-based method for correcting the conformal dimensions of castings (hereinafter referred to as the correction device), specifically, by one or more processors within the correction device, to achieve the following steps:

[0057] S101, Obtain the casting mesh model of the casting to be corrected.

[0058] S102, Perform casting thermal stress simulation based on the casting mesh model to obtain the deformation amount of each casting node in the casting mesh model, and then obtain the deformed mesh model.

[0059] In this embodiment, the correction device may be a computing device with data processing capabilities, such as a computer, workstation, or server; the present invention does not impose any specific limitations.

[0060] In this embodiment, when simulating the casting process, the design dimensions of the casting are first obtained, and then a casting mesh model is obtained based on these design dimensions. It should be understood that due to various deformation effects such as shrinkage and expansion that may occur during the casting process, the design dimensions of the casting mesh model are not necessarily equal to the actual design dimensions of the casting.

[0061] S103, obtain the target node on the casting mesh model, and classify the deformation of the target node according to the first coordinate of the target node on the casting mesh model and the second coordinate of its deformed simulated node on the deformed mesh model to obtain the deformation category of the target node.

[0062] In this embodiment, each node on the casting mesh model corresponds to a simulated node on the deformed mesh model. Let the coordinates of the casting node in the casting mesh model be the first coordinate, and the coordinates of its corresponding simulated node in the deformed mesh model be the second coordinate. Then, the deformation of each casting node can be classified based on these two coordinates:

[0063] Specifically, when the second coordinate of the target node in the deformed simulated node is within the range of the casting mesh model, the deformation category of the target node is marked as direct shrinkage.

[0064] If the first coordinate of the target node is within the range of the casting deformation mesh model, then the deformation category of the target node is marked as direct extension.

[0065] Otherwise, mark the deformation category of the target node as relative offset.

[0066] As shown in Figure 2, box 10 is the casting mesh model, box 20 is the deformed mesh model, box 30 can be considered as the casting nodes still in the original casting mesh model after deformation, which is a direct contraction, box 40 is no longer in the original casting model, but in the deformed mesh model, which is a direct expansion, and the two corner regions 50 do not satisfy the above two cases, that is, the points of the node before and after deformation are not in the same whole mesh model, but are relatively offset.

[0067] S104. Select corresponding reference points in the casting mesh model according to the deformation category of the target node, and calculate the anti-deformation amount of the target node according to the coordinates of each reference point, the target node, and the simulated node, so as to correct the coordinates of the target node.

[0068] In this embodiment, assuming that a local area of ​​the casting mesh model is scaled by a very small deformation amount Δx, this local area can be considered to have undergone a very small proportional scaling. This scaling has little impact on the macroscopic temperature field, and the cooling and solidification sequence does not change significantly. Therefore, the ratio of the deformation amounts of two reference points on this local casting can be considered a constant value. Thus, it can be considered that when a local casting model is scaled by a very small proportion, the impact on the macroscopic temperature field is small, and the cooling and solidification sequence does not change significantly. For this casting, the ratio of the deformation amounts of any two points on this local casting can be considered a constant value. This constant value is related to the position of the casting and is called the relative dimensional deformation coefficient of the casting during the solidification and cooling process, or simply the relative deformation coefficient. This relative deformation coefficient can be used to reversely correct the dimensions of the casting.

[0069] Based on the above theory and referring to Figure 3, in this embodiment, step S104 specifically includes:

[0070] S1041, Based on the deformation type of the target node A1, determine the first reference point B1 of the target node A1 on the casting mesh model;

[0071] S1042, obtain the second coordinate b1 of the first reference point B1 in the deformed mesh model;

[0072] S1043, assuming the target node for anti-deformation is A2, and the second coordinate of A2 in the deformable mesh model is a2, according to the definition of casting anti-deformation, a2 coincides with the target node A1, that is, the target node A2 for anti-deformation generates point A1 in the deformable mesh model after the casting thermal stress simulation;

[0073] S1044, assuming the anti-deformation target node of the first reference point B1 is B2, and its second coordinate in the deformed mesh model is b2, then b2 coincides with B1;

[0074] S1045, calculate the anti-deformation amount of the target node A1 based on the first coordinate A1 and the second coordinate a1 of the target node A1 and the first coordinate B1 and the second coordinate b1 of the first reference point B1, so as to correct the coordinates of the target node A1 based on the anti-deformation amount.

[0075] Specifically, as shown in Figure 3(a), when the deformation type is direct contraction, the second coordinate of the deformed target node A1 is selected as the coordinate of the first reference point B1.

[0076] The coordinates of the target correction node A2 are represented as follows:

[0077] in, This is the inverse deformation amount, where a2 is the coordinate of the simulated node a2 corresponding to the target correction node A2, and the coordinates of the simulated node a2 are the same as the coordinates of the target node A1.

[0078] In Figure 3(a), a2 and A1 coincide, and the coordinates of a2 are the same as the coordinates of A1.

[0079] As shown in Figure 3(b), when the deformation type is direct extension, the first coordinate of the target node A1 before deformation is selected as the coordinate of the second reference point b1;

[0080] The coordinates of the target correction point A2 are represented as follows:

[0081]

[0082] Here, point A1 and point a2 coincide.

[0083] As shown in Figure 3(c), when the deformation type is relative offset, the nearest direct shrinkage point on the casting mesh model is selected as the first reference point B1; wherein, the nearest direct shrinkage point satisfies that its own deformation type is direct shrinkage and is closest to the target node A1;

[0084] The coordinates of the target correction point A2 are then expressed as:

[0085]

[0086] Here, point B1 and point b2 coincide.

[0087] In summary, this embodiment yields the following relative inverse deformation control equations:

[0088]

[0089] In this embodiment, the dimensions of the casting can be corrected by performing coordinate correction on each node of the casting through the above steps.

[0090] In summary, this embodiment has the following technical effects:

[0091] 1) By using numerical simulation, the error verification cost of trial production can be eliminated, the actual production cycle can be shortened significantly, and the efficiency of casting design can be improved.

[0092] 2) Targeted compensation design for each casting node, while taking into account multiple key dimensions and local casting details;

[0093] 3) High compensation accuracy and short design cycle, which greatly improves the design quality of casting dimensions.

[0094] To further enhance understanding of the invention, a practical example is provided below to illustrate its application.

[0095] like Figure 4 As shown, Figure 4 The truss component model is used as the target for compensation casting, and inverse deformation design is performed based on the solidification numerical simulation results. After obtaining the casting compensation model, solidification numerical simulation is performed again on the compensation results to obtain the predicted production results of the casting under this compensation method. The design accuracy of this compensation method can be obtained by comparing it with the predicted production results of the initial casting model.

[0096] Figure 5 To determine the mean absolute error and quasi-error values ​​of the surface nodes of the truss components, solidification numerical simulations were performed on both the initial casting model and the compensated casting model to predict the casting dimensions under these conditions. The absolute error values ​​were calculated by extracting the coordinates of the surface nodes and the corresponding nodes in the target casting. Figure 5 ,from Figure 5 As can be seen, the average error of the casting surface nodes is significantly reduced after compensation, indicating that the casting model obtained in this embodiment is more reasonable and has a smaller deviation from the actual casting. Furthermore, the dimensional deviation fluctuation of the casting is smaller after compensation, resulting in smaller surface dimensional fluctuations and higher surface quality. The comparison proves that this relative inverse deformation method can obtain casting models with higher dimensional accuracy, guiding actual production, shortening the design cycle, and improving the dimensional accuracy of castings.

[0097] Please see Figure 6 The second embodiment of the present invention also provides a casting conformal dimension correction device based on numerical simulation, which includes:

[0098] Model acquisition unit 210 is used to acquire the casting mesh model of the casting to be corrected;

[0099] The stress simulation unit 220 is used to perform casting thermal stress simulation based on the casting mesh model, obtain the deformation amount of each casting node in the casting mesh model, and then obtain the deformed mesh model.

[0100] The deformation classification unit 230 is used to obtain target nodes on the casting mesh model, and classify the deformation of the target nodes according to the first coordinates of the target nodes on the casting mesh model and the second coordinates of the simulated nodes after deformation on the deformed mesh model to obtain the deformation category of the target nodes.

[0101] The correction unit 240 is used to select corresponding reference points in the casting mesh model according to the deformation category of the target node, and calculate the actual coordinates of the target node according to the coordinates of each reference point, the target node and the simulated node, so as to correct the size of the target node.

[0102] The third embodiment of the present invention also provides a casting conformal dimension correction device based on numerical simulation, which includes a memory and a processor. The memory stores a computer program, which can be executed by the processor to realize the casting conformal dimension correction method based on numerical simulation as described above.

[0103] In the several embodiments provided in this invention, it should be understood that the disclosed apparatus and methods can also be implemented in other ways. The apparatus and method embodiments described above are merely illustrative. For example, the flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods, and computer program products according to various embodiments of the present invention. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order than those marked in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in a block diagram and / or flowchart, and combinations of blocks in block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

[0104] In addition, the functional modules in the various embodiments of the present invention can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0105] If the aforementioned functions are implemented as software functional modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, electronic device, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks. It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. In the absence of further restrictions, an element defined by the phrase "comprising a..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0106] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for correcting the conformal dimensions of castings based on numerical simulation, characterized in that, include: Obtain the casting mesh model of the casting to be corrected; The casting thermal stress is simulated based on the casting mesh model to obtain the deformation of each casting node in the casting mesh model, thereby obtaining a deformed mesh model. Obtain the target node on the casting mesh model. Based on the first coordinate of the target node on the casting mesh model and the second coordinate of its deformed simulated node on the deformed mesh model, classify the deformation of the target node to obtain the deformation category of the target node. Based on the deformation category of the target node, a corresponding reference point is selected in the casting mesh model. The inverse deformation amount of the target node is calculated based on the coordinates of the reference point, the target node, and the simulated node, to correct the coordinates of the target node. The target node on the casting mesh model is obtained. Based on the first coordinate of the target node in the casting mesh model and the second coordinate of its deformed simulated node in the deformed mesh model, the deformation of the target node is classified to obtain the specific deformation category of the target node: Obtain the first coordinates of the target node located within the casting mesh model; Obtain the second coordinates of the simulated point of the target node on the deformable mesh model after the casting thermal stress simulation; If the second coordinate of the target node in the deformed simulated node is within the range of the casting mesh model, then the deformation category of the target node is marked as direct shrinkage; If the first coordinate of the target node is within the range of the deformable mesh model, then the deformation category of the target node is marked as direct extension; Otherwise, the deformation category of the target node is marked as relative offset; according to the deformation category of the target node, a corresponding reference point is selected in the casting mesh model, and the inverse deformation amount of the target node is calculated based on the coordinates of each reference point, the target node, and the simulated node, in order to correct the coordinates of the target node. Specifically: Based on the deformation type of the target node A1, determine the first reference point B1 of the target node A1 on the casting mesh model; Obtain the second coordinate b1 of the first reference point B1 in the deformable mesh model; Assuming the target correction node for the desired anti-deformation is A2, and the second coordinate of A2 in the deformable mesh model is a2, according to the definition of casting anti-deformation, a2 coincides with the target node A1, that is, the anti-deformation target node A2 generates point A1 in the deformable mesh model after the casting thermal stress simulation; Assume that the anti-deformation target node of the first reference point B1 is B2, and its second coordinate in the deformed mesh model is b2, which is equal to B1. Based on the first coordinate of the target node A1 With the second coordinate The first coordinate of the first reference point B1 With the second coordinate Calculate the inverse deformation amount of the target node, and then perform coordinate correction on the target node A1 based on the inverse deformation amount.

2. The method for correcting the conformal dimensions of castings based on numerical simulation according to claim 1, characterized in that, When the deformation type is direct contraction, the second coordinate of the deformed target node A1 is selected as the coordinate of the first reference point B1; The coordinates of the target correction node A2 are represented as follows: ;in For the amount of inverse deformation, The coordinates of the simulated node a2 corresponding to the target node A2 are corrected, and the coordinates of the simulated node a2 are the same as the coordinates of the target node A1.

3. The method for correcting the conformal dimensions of castings based on numerical simulation according to claim 2, characterized in that, When the deformation type is direct extension, the first coordinate of the target node A1 before deformation is selected as the coordinate of the second reference point b1; The coordinates of the target correction node A2 are represented as follows: 。 4. The method for correcting the conformal dimensions of castings based on numerical simulation according to claim 2, characterized in that, When the deformation type is relative offset, the nearest direct shrinkage point on the casting mesh model is selected as the first reference point B1; wherein, the nearest direct shrinkage point satisfies that its own deformation type is direct shrinkage and is closest to the target node A1; The coordinates of the target correction node A2 are then represented as follows: 。 5. The method for correcting the conformal dimensions of castings based on numerical simulation according to any one of claims 1 to 4, characterized in that, Also includes: The dimensions of the casting are corrected by traversing all nodes of the casting model and performing calculations.

6. A casting conformal dimension correction device based on numerical simulation, characterized in that, include: The model acquisition unit is used to acquire the casting mesh model of the casting to be corrected. The stress simulation unit is used to simulate casting thermal stress based on the casting mesh model, obtain the deformation of each casting node in the casting mesh model, and then obtain the deformed mesh model. The deformation classification unit is used to obtain target nodes on the casting mesh model, and classify the deformation of the target nodes according to the first coordinates of the target nodes in the casting mesh model and the second coordinates of the simulated nodes after deformation in the deformed mesh model to obtain the deformation category of the target nodes; wherein, specifically: obtaining the first coordinates of the target nodes located within the casting mesh model; Obtain the second coordinates of the simulated point of the target node on the deformed mesh model after the casting thermal stress simulation; if the second coordinates of the target node after deformation are within the range of the casting mesh model, then the deformation category of the target node is marked as direct shrinkage; if the first coordinates of the target node are within the range of the deformed mesh model, then the deformation category of the target node is marked as direct expansion. Otherwise, mark the deformation category of the target node as relative offset; The correction unit is used to select corresponding reference points in the casting mesh model according to the deformation type of the target node, and calculate the anti-deformation amount of the target node according to the coordinates of each reference point, the target node, and the simulated node, so as to correct the size of the target node; specifically, according to the deformation type of the target node A1, the first reference point B1 of the target node A1 is determined on the casting mesh model; the second coordinate b1 of the first reference point B1 in the deformed mesh model is obtained; assuming that the target correction node for the anti-deformation is A2, and the second coordinate of A2 in the deformed mesh model is a2, according to the definition of casting anti-deformation, a2 coincides with the target node A1, that is, the anti-deformation target node A2 generates point A1 in the deformed mesh model after the casting thermal stress simulation; assuming that the anti-deformation target node of the first reference point B1 is B2, and its second coordinate in the deformed mesh model is b2, b2 is equal to B1; according to the first coordinate of the target node A1... With the second coordinate The first coordinate of the first reference point B1 With the second coordinate Calculate the inverse deformation amount of the target node, and then perform coordinate correction on the target node A1 based on the inverse deformation amount.

7. A casting conformal dimension correction device based on numerical simulation, characterized in that, The system includes a memory and a processor, wherein the memory stores a computer program that can be executed by the processor to implement the numerical simulation-based method for correcting the conformal dimensions of castings as described in any one of claims 1 to 5.

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