Control model acquisition method and system for forming modeling of large-volume metal corrugated pipe, controller and control method

Abstract

A control model acquisition method and system, a controller and a control method for forming and modeling of a large-volume metal corrugated pipe, and the method comprises the following steps: step 100: establishing an assembly of the large-volume metal corrugated pipe in an Assembly module of Abaqus, step 200: establishing and setting boundary conditions and contact modes of the assembly, and analyzing, step 300: establishing and dividing all geometric model grids, and step 300: establishing and setting boundary conditions and contact modes of the assembly; and 400, an analysis task is established, analysis is conducted, and the influence rule of different forming parameters on the corrugated pipe structure and the influence rule of the different forming parameters on the residual stress of the corrugated pipe are calculated through analog simulation of the corrugated pipe forming technology.

Description

Technical Field

[0001] The present invention relates to a control model acquisition method and system, a controller and a control method, and in particular to a control model acquisition method and system, a controller and a control method for large-volume metal bellows forming modeling. Background Art

[0002] Compared with traditional oil conservators, metal bellows oil conservators have the advantages of high sealing, high reliability and maintenance-free. The core of the metal bellows oil conservator is the metal bellows. The performance of the bellows determines the performance of the oil conservator. Studying the forming process of the metal bellows is of great significance to the performance and design of the bellows. In the existing technology, many simulations and analyses have been conducted on small-diameter circular bellows. However, the metal bellows used in oil conservators have characteristics such as oversized diameter, deformity, and thin wall. The original bellows forming process simulation method is very different from the metal bellows used in oil conservators. The simulation results are difficult to apply to the metal bellows forming process for oil conservators. Based on the applicant's technical briefing document on March 21, 2025 and the existing technical problems, technical features and technical effects in similar background technologies obtained through retrieval, the technical solution of the present invention was made. Summary of the Invention

[0003] The object of the present invention is a control model acquisition method for large-volume metal bellows forming modeling. The object of the present invention is a control model acquisition system for large-volume metal bellows forming modeling. The object of the present invention is a controller for large-volume metal bellows forming modeling. The object of the present invention is a control method for forming and modeling large-volume metal bellows.

[0004] In order to overcome the above technical shortcomings, the purpose of the present invention is to provide a control model acquisition method and system, a controller and a control method for large-volume metal bellows forming modeling, so as to calculate the influence of different forming parameters on the bellows structure and the influence on the residual stress of the bellows.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is: A control model acquisition method for large-volume metal bellows forming modeling, comprising the following steps: Step 100: Create an assembly of a large volume metal bellows using the Assembly module in Abaqus. Step 200: Establish and set the assembly boundary conditions and contact mode, analysis steps, Step 300: Create and divide all geometric model meshes. Step 400: Establish an analysis task and conduct analysis.

[0006] Due to the design of the above steps, through the simulation of the corrugated pipe forming process, the influence laws of different forming parameters on the corrugated pipe structure and on the residual stress of the corrugated pipe are calculated.

[0007] The present invention designs: First, for a large-volume metal corrugated pipe, it includes a female die, a male die, a baffle, and a feeding plate. The male die includes a curved-edge section, a straight-edge section, and a curved-straight connection section. Use Solidworks software to construct the corresponding 3D models of the male die and the female die, and convert the solid parts into surface entities by deleting the surfaces. Use the surface tool to construct the direct area surface models of the baffle and the feeding plate. Save the constructed model as a file in the.x_t format, create a Model in Abaqus, and import the model file. Second, import the material parameters of the large-volume metal corrugated pipe into the Model. Third, create a new assembly in the Assembly module of Abaqus, import the male die, the female die, the sheet material, the feeding plate, and the baffle parts, and move and rotate each part to the corresponding positions to form a bulging device and a sheet material assembly.

[0008] The present invention designs to turn on the restart option in the Output function of the menu bar in Abaqus. Establish the contact properties between the sheet material and the male die, the female die, the feeding plate and the baffle. Their contact type is surface-to-surface contact. The contact properties include the friction coefficient of the tangential behavior and the penalty method of the normal behavior. The friction coefficient is set to 1.0 - 1.5, and the penalty method is hard contact. In the Load module, fix the baffle and the female die, give different feeding amounts in the horizontal direction to the male die, and set mirror constraints for the sheet material.

[0009] The present invention designs to divide the meshes of the male die, the female die, the feeding plate, and the baffle in the Mesh module of Abaqus, and re-divide the meshes for the fillets by edge seeding. Divide the meshes of the sheet material in the S4R format in Abaqus, and set meshes of different sizes for the straight-edge section and the curved surface section.

[0010] The present invention designs to create an analysis step in the Job module of Abaqus to start and run the previously established finite element analysis calculation.

[0011] The present invention designs that the material of the large-volume metal bellows is set as AISI304, the large-volume metal bellows is set as a homogeneous shell, the thickness of the large-volume metal bellows can be set to 0.3 - 16 mm, and the imported parameters are set as tensile strength, yield strength, elongation, density, specific heat capacity, thermal conductivity, Poisson's ratio, elastic modulus, and strain hardening index.

[0012] The present invention designs that the die for creating a new assembly in the Assembly module of Abaqus includes a punch, a baffle, a blank, a die, and a feeding plate. The punch is set to be connected to the die, the baffle is set to be connected to the punch, and the blank and the feeding plate are respectively set to be distributed corresponding to the die.

[0013] The present invention designs that the analysis step uses explicit dynamic analysis, sets the total duration, reasonably selects the mass scaling factor, and turns on the nonlinear analysis. The field output includes at least variables such as thickness, displacement, Mises stress, position, and strain. One analysis step is set for each bulging stage, including the bulging analysis step, the die removal analysis step, and the feeding analysis step.

[0014] The present invention designs that to accelerate the analysis and calculation, a multi-processor parallel calculation method is set, and double-precision calculation analysis is adopted to avoid excessive analysis and calculation errors that affect the accuracy of the forming model of the bellows. By setting the predefined initial state method for the calculated.odb file, the initial state of the sheet material during subsequent corrugated bulging is set, and the STH, PEEQ, COOD, and Mises output variables of the bellows are exported.

[0015] The present invention designs a control model acquisition system for large-volume metal bellows forming modeling, which includes the following contents: In the Assembly module of Abaqus, an assembly of the large-volume metal bellows is created to establish element 10. Set the assembly boundary conditions and contact methods, and establish element 20 for the analysis step. Divide the meshes of all geometric models to establish element 30. Analyze the task and perform the analysis to establish element 40.

[0016] The present invention designs a controller for large-volume metal bellows forming modeling, which includes the following contents: A control model for large-volume metal bellows forming modeling is stored in the controller. The control model for large-volume metal bellows forming modeling is obtained according to the above control model acquisition method for large-volume metal bellows forming modeling.

[0017] The present invention designs a control method for large-volume metal bellows forming modeling, which includes the following contents: In the CPU, a controller for large-volume metal bellows forming modeling is applied for control. [[ID=३]]Brief Description of the Drawings

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 It is a flowchart of a method for obtaining a control model for large-volume metal bellows forming modeling. Figure 2 It is a schematic structural diagram of a control model acquisition system for large-volume metal bellows forming modeling according to the present invention. Appendix Figure 3 It is the physical properties of AISI304. Appendix Figure 4 It is the true stress-strain curve of AISI304 stainless steel. Appendix Figure 5 It is a die assembly schematic diagram for creating a new assembly in the Assembly module of Abaqus. Appendix Figure 6 It is a Mises stress distribution nephogram. Appendix Figure 7 It is an equivalent plastic strain nephogram. Appendix Figure 8 It is a wall thickness distribution nephogram. Punch - 1, Baffle - 2, Sheet Metal - 3, Die - 4, Feeding Plate - 5. Detailed Embodiments

[0020] According to the examination guidelines, terms such as "having", "comprising", and "including" used in the present invention should be understood as not excluding the existence or addition of one or more other elements or their combinations.

[0021] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0022] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0023] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0024] The following further describes the present invention in conjunction with embodiments. The following embodiments are intended to illustrate the present invention rather than further limit the present invention.

[0025] A method for obtaining a control model for the forming modeling of a large-volume metal bellows, the steps of which are as follows: Step 100: Create an assembly of a large-volume metal bellows in the Assembly module of Abaqus. Step 200: Set the boundary conditions, contact modes, and analysis steps of the assembly. Step 300: Divide the meshes of all geometric models. Step 400: Create an analysis task and perform the analysis.

[0026] The following takes energy analysis as an example to illustrate the specific implementation of the method. In this embodiment, Step 100 specifically includes the following contents: 1. For the large-volume metal bellows, it includes a female mold, a male mold, a baffle, and a feeding plate. The male mold includes a curved edge section, a straight edge section, and a curved-straight connection section. Use Solidworks software to construct the corresponding three-dimensional models of the male mold and the female mold, and convert the solid parts into surface entities by deleting the surfaces. Use the surface tool to construct the surface models of the direct areas of the baffle and the feeding plate. Save the constructed model as a file in the.x_t format, create a Model in Abaqus, and import the model file. 2. Import the material parameters of the large-volume metal bellows into the Model. 3. Create a new assembly in the Assembly module of Abaqus, import the male mold, female mold, sheet material, feeding plate, and baffle parts, and move and rotate each part to the corresponding positions to form an assembly of the bulging device and the sheet material.

[0027] In this embodiment, step 200 specifically includes the following content: Open the restart option in the Output function of the menu bar in Abaqus, Establish the contact properties between the sheet metal and the punch, die, feeding plate, and baffle. Their contact type is surface-to-surface contact, The contact properties include the friction coefficient of the tangential behavior and the penalty method of the normal behavior. The friction coefficient is set to 1.0 - 1.5, and the penalty method is hard contact, In the Load module, fix the baffle and the die, give different feed amounts to the punch in the horizontal direction, and set the mirror constraint for the sheet metal.

[0028] In this embodiment, step 300 specifically includes the following content: In the Mesh module of Abaqus, mesh the punch, die, feeding plate, and baffle, and re-mesh the fillet by edge seeding, In the S4R format in Abaqus, mesh the sheet metal, and set different sizes of meshes for the straight edge segments and the curved surface segments.

[0029] In this embodiment, step 400 specifically includes the following content: In the Job module of Abaqus, create an analysis step to start and run the previously established finite element analysis calculation.

[0030] In this embodiment, the material of the large-volume metal bellows is set to AISI304, the large-volume metal bellows is set as a homogeneous shell, the thickness of the large-volume metal bellows can be set to 0.3 - 16 mm, and the imported parameters are set to tensile strength, yield strength, elongation, density, specific heat capacity, thermal conductivity, Poisson's ratio, elastic modulus, and strain hardening index, Appendix Figure 3 The physical properties of AISI304, Appendix Figure 4 The true stress-strain curve of AISI304 stainless steel.

[0031] In this embodiment, the mold for creating a new assembly in the Assembly module of Abaqus includes a punch 1, a baffle 2, a sheet metal 3, a die 4, and a feeding plate 5. The punch 1 is set to be connected to the die 4, the baffle 2 is set to be connected to the punch 1, and the sheet metal 3 and the feeding plate 5 are respectively set to be distributed corresponding to the die 4, Appendix Figure 5 The schematic diagram of the mold assembly for creating a new assembly in the Assembly module of Abaqus.

[0032] In this embodiment, the analysis step uses explicit dynamic analysis, sets the total duration, reasonably selects the mass scaling factor, and turns on the nonlinear analysis, The field output includes at least variables such as thickness, displacement, Mises stress, position, and strain. One analysis step is set for each bulging stage, including the bulging analysis step, the mold removal analysis step, and the feeding analysis step.

[0033] In this embodiment, to accelerate the analysis and calculation, a multi-processor parallel calculation method is set, and double-precision calculation analysis is used to avoid excessive analysis and calculation errors that may affect the accuracy of the forming model of the corrugated pipe. By setting the predefined initial state method for the calculated.odb file, the initial state of the sheet during subsequent corrugated bulging is set, and the STH, PEEQ, COOD, and Mises output variables of the corrugated pipe are exported. Appendix Figure 6 is the Mises stress distribution nephogram, appendix Figure 7 is the equivalent plastic strain nephogram, appendix Figure 8 is the wall thickness distribution nephogram.

[0034] A control model acquisition system for large-volume metal corrugated pipe forming modeling includes the following: In the Assembly module of Abaqus, an assembly of the large-volume metal corrugated pipe is created to establish element 10. Set the assembly boundary conditions and contact methods, and establish element 20 for the analysis step. Divide all geometric model meshes to establish element 30. For the analysis task, perform the analysis to establish element 40.

[0035] A controller for large-volume metal corrugated pipe forming modeling includes the following: A control model for large-volume metal corrugated pipe forming modeling is stored in the controller. In this embodiment, the control model for large-volume metal corrugated pipe forming modeling is obtained according to the above control model acquisition method for large-volume metal corrugated pipe forming modeling. Step 100: Create an assembly of the large-volume metal corrugated pipe in the Assembly module of Abaqus. Step 200: Establish the assembly boundary conditions, contact methods, and analysis steps. Step 300: Establish the division of all geometric model meshes. Step 400: Establish the analysis task and perform the analysis.

[0036] A control method for large-volume metal corrugated pipe forming modeling includes the following: Apply the controller for large-volume metal corrugated pipe forming modeling in the CPU for control.

[0037] When verifying the present invention, the technical features of the simulation of the corrugated pipe forming process were first proposed, and the first unexpected technical effect was obtained: the parameters in the forming process of the large-volume metal corrugated pipe were optimized and matched, improving the preparation effect of the large-volume metal corrugated pipe. The second unexpected technical effect was obtained: the simulation calculation of the large-volume metal corrugated pipe was realized according to the requirements of the conservator, improving the reliable performance of the transformer. The third unexpected technical effect was obtained: the stress distribution nephogram of the large-volume metal corrugated pipe was obtained, and the equivalent plastic strain nephogram of the large-volume metal corrugated pipe was obtained, optimizing the installation method of the large-volume metal corrugated pipe. The fourth unexpected technical effect was obtained: the wall thickness distribution nephogram of the large-volume metal corrugated pipe was obtained, optimizing the die parameters of the large-volume metal corrugated pipe.

[0038] The above embodiments are only one implementation form of the control model acquisition method, system, controller and control method for large-volume metal corrugated pipe forming modeling provided by the present invention. Other deformations according to the solutions provided by the present invention, adding or reducing components or steps therein, or applying the present invention to other technical fields close to the present invention all fall within the protection scope of the present invention.

Claims

1. A method for obtaining a control model for the forming modeling of a large-volume metal bellows, characterized in that the steps are as follows: Step 100: Create an assembly of a large-volume metal bellows in the Assembly module of Abaqus. Step 200: Set the boundary conditions, contact mode, and analysis step of the assembly. Step 300: Divide the meshes of all geometric models. Step 400: Create an analysis task and perform the analysis.

2. The method for obtaining a control model for the forming modeling of a large-volume metal bellows according to claim 1, characterized in that: I. For a large-volume metal bellows, which includes a female die, a male die, a baffle, and a feeding plate, where the male die includes a curved-edge section, a straight-edge section, and a curved-straight connection section, Use Solidworks software to construct the corresponding 3D models of the male die and the female die, and convert the solid parts into surface entities by deleting the surfaces. Use the surface tool to construct the direct-region surface models of the baffle and the feeding plate. Save the constructed models as files in the.x_t format, create a Model in Abaqus, and import the model files. II. Import the material parameters of the large-volume metal bellows into the Model. III. Create a new assembly in the Assembly module of Abaqus, import the male die, female die, sheet material, feeding plate, and baffle parts, and move and rotate each part to the corresponding positions to form a bulging device and a sheet material assembly.

3. The method for obtaining a control model for the forming modeling of a large-volume metal bellows according to claim 1, characterized in that: At Open the restart option in the Output function of the menu bar in Abaqus. Establish the contact properties between the sheet material and the male die, female die, feeding plate, and baffle. Their contact type is surface-to-surface contact. The contact properties include the friction coefficient of the tangential behavior and the penalty method of the normal behavior. The friction coefficient is set to 1.0 - 1.5, and the penalty method is hard contact. In the Load module, fix the baffle and the female die, give different feeding amounts to the male die in the horizontal direction, and set the mirror constraint for the sheet material.

4. The method for obtaining a control model for the forming modeling of a large-volume metal bellows according to claim 1, characterized in that: In In the Mesh module of Abaqus, divide the meshes of the male die, female die, feeding plate, and baffle, and re-divide the meshes with edge seeding for the rounded corners. In the S4R format in Abaqus, divide the meshes of the sheet material, and set meshes of different sizes for the straight-edge section and the curved surface section.

5. The method for obtaining a control model for the forming modeling of a large-volume metal bellows according to claim 1, characterized in that: At In the Job module of Abaqus, create an analysis step to start and run the previously established finite element analysis calculation.

6. The method for obtaining a control model for large-volume metal bellows forming modeling according to claim 1, characterized in that: The material of the large-volume metal bellows is set to AISI304, the large-volume metal bellows is set as a homogeneous shell, the thickness of the large-volume metal bellows can be set to 0.3 - 16 mm, and the imported parameters are set to tensile strength, yield strength, elongation, density, specific heat capacity, thermal conductivity, Poisson's ratio, elastic modulus, and strain hardening index. Alternatively, the die for creating a new assembly in the Assembly module of Abaqus includes a punch (1), a baffle plate (2), a sheet metal (3), a die (4), and a feeder plate (5). The punch (1) is set to be connected to the die (4), the baffle plate (2) is set to be connected to the punch (1), and the sheet metal (3) and the feeder plate (5) are respectively set to be distributed corresponding to the die (4). Alternatively, the analysis step uses explicit dynamic analysis, sets the total duration, reasonably selects the mass scaling factor, and turns on the nonlinear analysis. The field output includes at least variables such as thickness, displacement, Mises stress, position, and strain. One analysis step is set for each bulging stage, including the bulging analysis step, the die removal analysis step, and the feeding analysis step.

7. The method for obtaining a control model for large-volume metal bellows forming modeling according to claim 1, characterized in that: To accelerate the analysis calculation, a multi-processor parallel calculation method is set, and double-precision calculation analysis is adopted to avoid excessive analysis calculation errors that may affect the accuracy of the forming model of the corrugated pipe. The calculated.odb file is used to set the initial state of the sheet metal during subsequent corrugated bulging by setting the predefined initial state method, and the STH, PEEQ, COOD, and Mises output variables of the corrugated pipe are exported.

8. A control model acquisition system for large-volume metal corrugated pipe forming modeling, including the following: Create a unit 10 for the assembly of a large-volume metal corrugated pipe in the Assembly module of Abaqus. Set the assembly boundary conditions and contact methods, and establish a unit 20 for the analysis step. Divide the meshes of all geometric models to establish a unit 30. Analyze the task and perform analysis to establish a unit 40.

9. A controller for large-volume metal corrugated pipe forming modeling, including the following: A control model for large-volume metal corrugated pipe forming modeling is stored in the controller. The control model for large-volume metal corrugated pipe forming modeling is obtained according to the above control model acquisition method for large-volume metal corrugated pipe forming modeling.

10. A control method for large-volume metal corrugated pipe forming modeling, including the following: Apply the controller for large-volume metal corrugated pipe forming modeling in the CPU for control.

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