A multi-process continuous simulation method for stress and deformation in the manufacturing of hot-walled kitchen containers

Abstract

The present invention discloses a multi-process continuous simulation method for stress and deformation in the manufacture of kitchen and hot thin-walled containers, belonging to the technical field of continuous simulation of metal cold forming, assembly and hot working. This method is aimed at the rolling, straightening, longitudinal seam arc welding, assembly and circumferential seam laser welding processes of kitchen and hot thin-walled containers, and proposes a full-process finite element modeling and simulation method for the continuous production process of thin-walled containers. It can not only predict the residual stress and springback process after the thin plate is rolled, but also reproduce the dimensional deviation correction and stress interaction process of the cylinder during the straightening and assembly process. It can also realize the simulation of the welding process taking into account the dimensional deviation and initial stress, thereby realizing the analysis and control of the influencing factors of the pre-weld butt gap of high-energy beam welding with strict dimensional accuracy requirements. This method was used to simulate the rolling, straightening and longitudinal seam arc welding processes of a plate with a length, width and thickness of 124πmm*168mm*0.4mm, as well as its assembly and circumferential seam laser welding with the end cover. The forming process and stress deformation results are realistic.

Description

Technical Field

[0001] The present invention proposes a continuous simulation method for stress and deformation during the manufacturing process of kitchen and hot thin-walled containers, which belongs to the technical field of continuous simulation of metal cold forming, assembly and hot processing. It is suitable for finite element simulation of component stress and deformation during multi-step cold / hot processing in the manufacture of kitchen and hot thin-walled containers. Background Art

[0002] The manufacturing process for thin-walled kitchen hotplate containers primarily involves four steps: sheet metal rolled into a cylinder—tungsten inert gas arc welding of the cylinder's longitudinal seam—assembly and correction of the end caps with tooling—and circumferential laser welding of the end caps to the cylinder. First, the stainless steel sheet is rolled into a cylinder of predetermined dimensions using a symmetrical four-roller rolling machine, which is then further compressed and formed using a correction tooling. Secondly, tungsten inert gas arc welding is performed along the axial longitudinal seam at the connecting end of the cylinder. Finally, the cylinder is placed on a tooling table designed to correct welding distortion. The end caps are assembled using an end cap fixing module, and the tooling components are expanded and corrected within the cylinder and end caps to ensure alignment. Finally, the end caps are circumferentially laser welded to the cylinder on the tooling table.

[0003] In order to understand the stress and deformation of components during the container manufacturing process, companies need to rely on finite element simulation to achieve this goal. Although traditional single-process simulation has been widely used in many fields, it still has great limitations. In actual production, a formed part is manufactured by multiple steps. Traditional single-process simulation methods cannot correlate the stress and deformation of components in the previous and subsequent processes. On the one hand, this will cause the stress distribution pattern to be changed, resulting in incorrect judgments on component stress analysis. On the other hand, it cannot reflect the impact of accumulated deformation on subsequent processes, which in turn affects the component forming situation, resulting in a large gap between the simulation results and reality.

[0004] As an advanced finite element simulation method, continuous simulation technology effectively solves the problem of isolated simulation data between processes. The key to continuous simulation is the transfer of simulation data between processes. The core method is to extract the simulation result data such as temperature, stress, deformation, etc. corresponding to the finite element model grid from the previous process model to the subsequent process model. Data transfer is usually divided into three steps: extraction, processing and loading. The process is as follows: Figure 1 The details are as follows:

[0005] (1) Simulation data extraction

[0006] From the result file of the previous process, determine the last step of the working condition, save its deformation and non-deformation data and extract them.

[0007] (2) Simulation data processing

[0008] After the previous calculation, the 3D coordinates of the mesh nodes have changed. This means that the deformation data is already reflected in the mesh model, while non-deformation data requires data mapping between meshes to transfer. Finite element software features and subroutine interfaces can help complete this data processing.

[0009] (3) Simulation data loading

[0010] For deformed data, directly import the mesh model and add additional models in combination with subsequent working conditions to ultimately establish the finite element model for the new process. For non-deformed data, load it into the model for subsequent process simulation in the form of initial condition data files.

[0011] The continuous simulation method of stress and deformation in the manufacturing process of kitchen hot thin-walled containers connects multiple cold / hot processing steps in series, which can obtain the change process and results of component stress and deformation that are closest to reality. Summary of the Invention

[0012] In view of the production process described in the background technology and based on the advanced simulation method proposed in the above analysis, the present invention proposes a continuous simulation method for the stress and deformation of the manufacturing process of kitchen hot thin-walled containers, which can solve the stress and deformation in the component manufacturing process with high accuracy.

[0013] The specific process of continuous simulation of the manufacturing process proposed by the present invention is as follows: Figure 2 As shown, it includes the following steps:

[0014] Step 1: Comprehensively consider the processing scope of each step in the manufacturing process and establish a finite element mesh model of the plate and end cover used in the container;

[0015] Step 2: Establish a finite element model of a symmetrical four-roll plate rolling machine, import the plate mesh model, define material parameters, boundary conditions, contact conditions, and working condition information, and obtain a complete finite element model of the plate rolling process;

[0016] Step 3: Conduct structural analysis of the sheet metal rolling process to obtain the stress and forming conditions of the sheet metal;

[0017] Step 4: Establish a finite element model of the cylindrical orthopedic tooling, import the simplified mesh model and stress data after rolling, define material parameters, boundary conditions, contact conditions and working condition information, and obtain a complete finite element model of the cylindrical orthopedic process;

[0018] Step 5: Carry out structural analysis of the simplified body correction process to obtain the stress and forming conditions of the cylinder;

[0019] Step 6: Import the mesh model and stress data of the reshaped cylinder, define the material parameters, heat source model, boundary conditions and working condition information, and establish a complete finite element model of the cylinder longitudinal seam tungsten inert gas arc welding process;

[0020] Step 7: Conduct thermal / structural analysis of the longitudinal seam of the barrel using tungsten inert gas arc welding to obtain the stress and deformation of the barrel;

[0021] Step 8: Import the simplified mesh model and stress data after longitudinal seam welding, import the finite element mesh model of the end cap, extract the geometric model of the end cap assembly fixture and the correction tooling table, define material parameters, boundary conditions, contact conditions and working condition information, and establish a complete finite element model of the end cap assembly and tooling correction process;

[0022] Step 9: Conduct structural analysis of the end cap assembly and tooling correction to obtain the stress and deformation of the end cap and barrel;

[0023] Step 10: Import the post-correction tooling model, as well as the cylinder and end cap mesh models and stress data. Define material parameters, heat source model, boundary conditions, contact conditions, and working condition information to establish a complete finite element model of the circumferential laser welding process between the end cap and the cylinder.

[0024] Step 11: Conduct thermal / structural analysis of the circumferential laser weld between the end cap and the barrel to obtain the final stress and deformation of the end cap and the barrel.

[0025] Among them, in step 1, the plate undergoes four steps of rolling, longitudinal seam welding, assembly and correction, and circumferential seam welding, and the coarse and fine grid transition is performed on the four sides of the plate; the end cover undergoes two steps of assembly and correction and circumferential seam welding, and it is divided into transition grids. At the same time, the edge grid of the end cover corresponds to the grid of the plate.

[0026] The material parameters in step 2 include density, Young's modulus, Poisson's ratio, and yield strength at room temperature. The boundary conditions in step 2 require setting the upper roller's downward pressure and the lower roller's rotational speed. The contact conditions in step 2 primarily refer to the contact information between the sheet and the four rollers. The operating conditions in step 2 include the three operating conditions of downward pressure, rolling, and unloading, as well as the time for each operating condition.

[0027] The cylinder mesh model and stress data in step 4 must be derived from the simulation in step 3. The material parameters in step 4 include density, Young's modulus, Poisson's ratio, and yield strength at room temperature. The boundary conditions in step 4 require setting the travel distance of the tooling components. The contact conditions in step 4 primarily refer to the contact information between the cylinder and the various tooling components.

[0028] Among them, the cylinder mesh model and stress data in step 6 must be simulated by step 5. The material parameters in step 6 include density, specific heat capacity, thermal conductivity, Young's modulus, Poisson's ratio, thermal expansion coefficient and yield strength that change with temperature. The boundary conditions in step 6 need to be based on the actual welding situation, and all nodes fixed by the fixture on both sides of the weld must be selected. The working condition information in step 6 includes three working conditions of welding, cooling, and unloading, as well as the time of each working condition. The heat source model in step 6 adopts a double ellipsoid heat source model, and the welding path, welding speed and heat source morphology parameters need to be set. The hemispherical heat source power density distribution function is:

[0029] The power density distribution in the front half of the ellipsoid is:

[0030]

[0031] The power density distribution in the second half of the ellipsoid is:

[0032]

[0033] Q is the power of the double ellipsoid heat source, v is the welding speed, f f and f r is the energy fraction of the front and rear ellipsoids, f f +f r =2; a, b, c f , c r is the ellipsoid shape parameter, which can have different independent values.

[0034] Among them, the cylinder mesh model and stress data in step 8 must be obtained by simulation in step 7. The material parameters in step 8 include density, Young's modulus, Poisson's ratio and yield strength at room temperature. The contact conditions in step 8 mainly refer to the contact information between the end cover and the end cover fixture, the cylinder and the end cover, the cylinder, the end cover and the orthopedic component of the workbench, and the cylinder and the workbench base. The working condition information of step 8 includes two working conditions: end cover assembly and tooling correction, as well as the working condition time. In the boundary conditions of step 8, there is a kinematic relationship between the orthopedic component and the control axis, and the motion of the orthopedic component needs to be set. The motion control equation is:

[0035] d θ =h θ *tanθ

[0036] θ represents the slope of the slope, θ = 5°, h θ Indicates the downward movement distance of the control axis, d θ Indicates the outward expansion distance of the orthotic component.

[0037] Among them, the end cover, cylinder mesh model and stress data in step 10 must be simulated by step 9. The material parameters in step 10 include density, specific heat capacity, thermal conductivity, Young's modulus, Poisson's ratio, thermal expansion coefficient and yield strength that change with temperature. The boundary conditions in step 10 need to be based on the actual welding situation, and all nodes fixed by the fixture on both sides of the weld are selected. The working condition information in step 10 includes three working conditions of welding, cooling and unloading, as well as the time of each working condition. The heat source model in step 10 adopts a combined heat source model of Gaussian surface heat source and Gaussian rotating body heat source. It is necessary to set the welding path, welding speed and heat source morphology parameters. The heat source power density distribution function is:

[0038] The power density distribution of the Gaussian distribution surface heat source is:

[0039]

[0040] The power density distribution of the Gaussian rotating body heat source is:

[0041]

[0042] The total power of the laser heat source is:

[0043] Q η =Q s +Q v

[0044] α is the heat flux concentration coefficient, β is the attenuation coefficient, Q s is the surface heat source power, Q v is the body heat source power, r s is the effective action radius of the surface heat source, r v is the effective action radius of the body heat source, H is the effective action depth of the body heat source, and η is the effective absorption coefficient of the heat source.

[0045] The beneficial effects of this invention are: Utilizing continuous simulation technology, the continuous simulation of the manufacturing process for hot-walled kitchenware containers innovatively combines cold and hot processing, achieving a technological breakthrough in the simulation of rolling and welding. Continuous process simulation offers significant advantages over traditional finite element simulation: stresses and deformations generated by upstream processes are accurately reflected in subsequent steps, avoiding the problem of overly idealized components. It also facilitates monitoring and analysis of the entire process, enabling timely identification of stress or deformation issues caused by upstream steps and enabling process optimization and adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 Data transfer flow chart

[0047] Figure 2 Flowchart of continuous simulation of manufacturing process

[0048] Figure 3Schematic diagram of the plate and end cap grid model

[0049] Figure 4 Schematic diagram of sheet metal rolling model

[0050] Figure 5 Schematic diagram of the cylindrical orthosis model

[0051] Figure 6 Schematic diagram of the tungsten inert gas arc welding model for the longitudinal seam of the barrel

[0052] Figure 7 Material parameters for hot working

[0053] Figure 8 Schematic diagram of end cap assembly and tooling correction model

[0054] Figure 9 Schematic diagram of the relationship between the orthopedic component and the control axis movement

[0055] Figure 10 Schematic diagram of the laser welding model of the end cover and the barrel circumferential seam DETAILED DESCRIPTION

[0056] According to the continuous simulation method of the present invention, the manufacturing process of a certain brand of kitchen hot stainless steel thin-walled container is simulated to obtain the stress and deformation results of the component, as shown below.

[0057] Step 1: The plate size is 124πmm*168mm*0.4mm (length×width×thickness), and is divided into hexahedral grids. A fine grid of 1mm*1mm*0.4mm is divided within the range of 6mm on the long side edge and 3mm on the wide side edge. The remaining area is divided into a coarse grid of 3mm*3mm*0.4mm. A 1:3 grid transition is made between the coarse and fine grids. The grid in the thickness direction is 1 layer, and the number of grids is 16400. The diameter of the end cap is Ф124mm, the thickness is 0.4mm, the axial depth is 14mm, and the fillet radius is 5mm. Hexahedral grid division is also used, and the fillet of the end cap and its lower area are divided into a fine grid of 1mm*1mm*0.4mm. Two 1:3 grid transitions are made toward the center of the end cap. The grid in the thickness direction is 1 layer, and the number of grids is 9000. The grid model of the plate and end cap is as follows. Figure 3 shown.

[0058] Step 2: Complete plate rolling finite element model, including two upper rollers, two lower rollers and a flat plate, the model is as follows Figure 4 Modeling includes the following processes:

[0059] (1) Establish a symmetrical four-roller plate rolling machine model: the four rollers are all rigid surfaces, the diameters of the two upper rollers are 24 mm, the diameters of the two lower rollers are 40 mm, the span between the upper rollers is 28 mm, the span between the lower rollers is 64 mm, and the roller length is 170 mm.

[0060] (2) Establishing contact relationship: Import the plate mesh, set it as a deformable body, and set the contact relationship to self-contact; establish friction contact relationship between the plate and the four rollers, and set the friction coefficient to 0.2.

[0061] (3) Establish the material model: Use constant parameters at room temperature, including density 0.79 g / mm3, Young's modulus 194 GPa, Poisson's ratio 0.3, and yield strength 291 MPa.

[0062] (4) Establishing initial conditions: Apply initial temperature conditions to the deformed plate, and the temperature is set to room temperature 25°C.

[0063] (5) Establish boundary conditions: During the pressing process, the lower roller remains stationary, and the upper roller presses down perpendicularly to the plate. A displacement-time curve is established, and the pressing amount within 1 s is 4.58 mm; during the rolling process, the upper roller remains stationary at its current position, and the lower roller rotates counterclockwise with an angular velocity of 2.3 rad / s, completing the plate rolling within 10 s; during the unloading process, the lower roller remains stationary, and the upper roller rises perpendicularly to the plate. A displacement-time curve is established, and the plate is reset within 1 s.

[0064] (6) Establish working condition information: According to the three stages of rolling and their corresponding time, three working conditions are established respectively, corresponding to pressing, rolling, and unloading; when pressing, only the upper roller displacement boundary condition is applied, and the working condition time is 1s; when rolling, only the lower roller rotation boundary condition is applied, and the working condition time is 10s; when unloading, only the upper roller displacement boundary condition is applied, and the working condition time is 1s.

[0065] Step 3: Carry out simulation calculation of sheet metal rolling structure analysis to obtain cylinder stress and forming results.

[0066] Step 4: The complete cylindrical orthopedic finite element model includes an inner cylinder, six outer petals and a cylinder. The model is as follows Figure 5 Modeling includes the following processes:

[0067] (1) Establish a cylindrical orthopedic tool model: The tool consists of an inner cylinder with a diameter of 124 mm and six fan-shaped outer petals with a radius of 62 mm and an arc of 60°. The six outer petals are distributed around the inner cylinder at a certain distance. The inner cylinder and the outer petals are rigid surfaces.

[0068] (2) Establishing contact relationship: Import the mesh model of the cylinder after the sheet is rolled, set it as a deformable body, and set the contact relationship to self-contact; define the friction contact relationship between the cylinder and the inner cylinder and the six outer petals respectively, and set the friction coefficient to 0.2.

[0069] (3) Establish the material model: Use constant parameters at room temperature, including density 0.79 g / mm3, Young's modulus 194 GPa, Poisson's ratio 0.3, and yield strength 291 MPa.

[0070] (4) Establishing initial conditions: Import the stress data of the cylinder after rolling as the initial stress condition; apply initial temperature conditions to the cylinder, and set the temperature to room temperature 25°C.

[0071] (5) Establish boundary conditions: the position of the inner cylinder remains fixed, and each outer petal moves toward the center of the inner cylinder. Establish a displacement-time curve, and the displacement is 5 mm in 1 s.

[0072] (6) Establish working condition information: There is only one working condition, which is the displacement boundary condition of only six outer petals when the plate is pressed for correction, and the working condition time is 1s.

[0073] Step 5: Carry out simulation calculation of cylinder orthopedic structure analysis to obtain cylinder stress and forming results.

[0074] Step 6: The complete finite element model of the longitudinal seam of the cylinder body is composed of only one cylinder. Figure 6 Modeling includes the following processes:

[0075] (1) Establish contact relationship: Import the corrected cylinder mesh model, set it as a deformable body, and set the contact relationship to self-contact; the heat dissipation coefficient of the contact body is set to 40W / (m 2 ·K).

[0076] (2) Establish material model: Thermal processing uses material parameters that change with temperature. A complete material parameter model is as follows: Figure 7 shown.

[0077] (3) Establishing initial conditions: Import the stress data of the cylinder after correction as the initial stress condition; apply initial temperature conditions to the cylinder, and set the temperature to room temperature 25℃.

[0078] (4) Establish a heat source model: The double ellipsoid heat source morphology parameters are determined by the cross-sectional morphology of the weld. The welding current is 55A, the welding speed is 40mm / s, and the two ends of the longitudinal seam are selected as the starting and ending points for welding, and welding is performed along the axial direction of the cylinder.

[0079] (5) Establish boundary conditions: In welding and cooling conditions, full constraints are set at 10 nodes at 3 mm on both sides of the longitudinal seam path as mechanical boundary condition 1; in unloading conditions, full constraints are set at 4 nodes opposite to the longitudinal seam of the cylinder as mechanical boundary condition 2.

[0080] (6) Establish working condition information: According to the three stages of the welding process, three working conditions are established: welding, cooling and unloading. When welding, the heat source condition and mechanical boundary condition 1 are selected, and the working condition time is 3.4s; when cooling, only mechanical boundary condition 1 is selected, and the working condition time is 50s; when unloading, only mechanical boundary condition 2 is selected, and the working condition time is 1s.

[0081] Step 7: Carry out thermal / structural analysis simulation calculation of the longitudinal seam tungsten inert gas arc welding of the cylinder to obtain the stress and deformation results of the cylinder.

[0082] Step 8: The complete end cap assembly and tooling correction finite element model includes a tooling table, an end cap fixing fixture, a cylinder and an end cap. The tooling table consists of a limit end, six external expansion components, a control shaft and a connecting shaft. The model is as follows Figure 8 Modeling includes the following processes:

[0083] (1) Establishing contact relationships: Extract the geometric models of the end cover fixture and the workbench assembly from the CAD software and set them as rigid bodies; import the cylinder mesh model and the end cover mesh model after longitudinal seam welding and set them as deformable bodies. The cylinder is bonded to itself and the cylinder and the end cover are in friction contact with each other, and the friction coefficient is set to 0.1; select the fixture and the end cover, the six external expansion components and the end cover, and the six external expansion components and the cylinder, and establish friction contact relationships respectively, with the friction coefficient set to 0.2; select the cylinder and the limit end to establish a bonding relationship.

[0084] (2) Establishing the material model: using constant parameters at room temperature, including density 0.79 g / mm3, Young's modulus 194 GPa, Poisson's ratio 0.3, and yield strength 291 MPa.

[0085] (3) Establish initial conditions: Import the stress data of the cylinder after longitudinal seam welding as the initial stress condition; apply initial temperature conditions to the end cover and cylinder, and set the temperature to room temperature 25℃.

[0086] (4) Establish boundary conditions: During the end cap assembly process, the end cap is displaced axially toward the cylinder, and a displacement-time curve is established. The end cap is displaced a certain distance within 5 seconds until it contacts the cylinder. During the tooling correction process, the control axis moves downward by a distance h. θ is 8 mm, and the outward displacement d of the six orthopedic components is calculated. θ The displacement-time curve is 0.7 mm, and the displacement is carried out within 1.5 s. The motion relationship diagram is shown in the figure below. Figure 9 shown.

[0087] (5) Establish working condition information: establish two working conditions, end cap assembly and tool correction, according to the process stage; end cap assembly only has end cap displacement boundary conditions, and the working condition time is 5s; tool correction only has correction component displacement boundary conditions, and the working condition time is 1.5s.

[0088] Step 9: Carry out structural analysis simulation calculations of the end cover assembly and tooling correction to obtain the stress and deformation results of the end cover and cylinder.

[0089] Step 10: The complete finite element model of the laser welding of the end cover and the barrel, including a tooling table, a barrel and an end cover, is shown in the figure. Figure 10 Modeling includes the following processes:

[0090] (1) Establish contact relationship: Import the mesh model of the end cap and cylinder after tooling correction, set it as a deformable body, the cylinder is in self-contact, and the end cap and the cylinder are set to be bonded; the heat dissipation coefficient of the contact body is set to 40W / (m 2 ·K).

[0091] (2) Establish material model: Thermal processing uses material parameters that change with temperature. A complete material parameter model is as follows: Figure 7 shown.

[0092] (3) Establish initial conditions: Import the stress data of the end cap and the cylinder after the tooling correction as the initial stress conditions; apply initial temperature conditions to the end cap and the cylinder, and set the temperature to room temperature 25℃.

[0093] (4) Establish a heat source model: The composite heat source morphology parameters are determined by the cross-sectional morphology of the weld. The laser power is 825 W, the welding speed is 45 mm / s, and the longitudinal weld stop point is selected as the start / end weld point of the circumferential weld. The weld is welded in a clockwise direction along the circumference.

[0094] (5) Establish boundary conditions: In welding and cooling conditions, full constraints are set at 14 nodes in the four directions of the end cover and the cylinder with a period of 90°, which serves as mechanical boundary condition 1. In unloading conditions, full constraints are set at 4 nodes opposite to the longitudinal seam of the cylinder, which serves as mechanical boundary condition 2.

[0095] (6) Establish working condition information: According to the three stages of the welding process, three working conditions are established: welding, cooling and unloading. When welding, the heat source condition and mechanical boundary condition 1 are selected, and the working condition time is 8.5s; when cooling, only mechanical boundary condition 1 is selected, and the working condition time is 50s; when unloading, only mechanical boundary condition 2 is selected, and the working condition time is 1s.

[0096] Step 11: Conduct thermal / structural analysis simulation calculations for the circumferential laser welding of the end cover and the barrel to obtain the final stress and deformation results of the end cover and the barrel.

[0097] The protection scope of the present invention includes but is not limited to the above embodiments. The protection scope of the present invention is based on the claims. Any replacement, deformation, and improvement of the technology that can be easily thought of by those skilled in the art fall within the protection scope of the present invention.

Claims

1. A continuous simulation method for stress and deformation during the manufacturing process of thin-walled kitchen containers, characterized in that The following steps are involved: Step 1: Comprehensively consider the processing scope of each step in the manufacturing process and establish a finite element mesh model of the plate and end cover used in the container; Step 2: Establish a finite element model of a symmetrical four-roll plate rolling machine, import the plate mesh model, define material parameters, boundary conditions, contact conditions, and working condition information, and obtain a complete finite element model of the plate rolling process; Step 3: Conduct structural analysis of the sheet metal rolling process to obtain the stress and forming conditions of the sheet metal; Step 4: Establish a finite element model of the simplified orthopedic tooling, import the mesh model and stress data of the rolled cylinder, define material parameters, boundary conditions, contact conditions, and working condition information, and obtain a complete finite element model of the cylinder orthopedic process; Step 5: Conduct structural analysis of the cylinder correction process to obtain the stress and forming conditions of the cylinder: Step 6: Import the mesh model and stress data of the reshaped cylinder, define the material parameters, heat source model, boundary conditions and working condition information, and establish a complete finite element model of the cylinder longitudinal seam tungsten inert gas arc welding process: Step 7: Conduct thermal / structural analysis of the longitudinal seam of the barrel using tungsten inert gas arc welding to obtain the stress and deformation of the barrel; Step 8: Import the cylinder mesh model and stress data after longitudinal seam welding, import the end cap finite element mesh model, extract the geometric model of the end cap assembly fixture and the correction tooling table, define material parameters, boundary conditions, contact conditions and working condition information, and establish a complete finite element model of the end cap assembly and tooling correction process; Step 9: Conduct structural analysis of the end cap assembly and tooling correction to obtain the stress and deformation of the end cap and barrel; Step 10: Import the post-correction tooling model, as well as the cylinder and end cap mesh models and stress data. Define material parameters, heat source model, boundary conditions, contact conditions, and working condition information to establish a complete finite element model of the circumferential laser welding process between the end cap and the cylinder. Step 11: Conduct thermal / structural analysis of the circumferential laser weld between the end cap and the barrel to obtain the final stress and deformation of the end cap and the barrel.

2. The method for continuous simulation of stress and deformation during the manufacturing process of a thin-walled kitchen hot container according to claim 1, characterized in that In step 1, the plate undergoes four steps of processing: rolling, longitudinal seam welding, assembly and correction, and circumferential seam welding. A transition between coarse and fine meshes is performed on the four sides of the plate to improve simulation efficiency. The end cap undergoes two steps of processing: assembly and correction, and circumferential seam welding. A transition mesh is then applied to it, and the mesh at the edge of the end cap corresponds to the mesh of the plate.

3. The method for continuous simulation of stress and deformation during the manufacturing process of a thin-walled kitchen hot water container according to claim 1, characterized in that In step 4, the rolled cylinder mesh model is used as the initial model of the current working condition, and the stress data is used as the initial stress condition of the current working condition, thereby achieving continuous simulation.

4. The method for continuous simulation of stress and deformation during the manufacturing process of a thin-walled kitchen hot water container according to claim 1, characterized in that In step 6, the corrected cylinder mesh model is used as the initial model of the current working condition, and the stress data is used as the initial stress condition of the current working condition to achieve continuous simulation.

5. The method for continuous simulation of stress and deformation during the manufacturing process of a thin-walled kitchen hot water container according to claim 1, characterized in that In step 8, the cylinder mesh model after longitudinal seam welding is used as the initial model of the current working condition, and the stress data is used as the initial stress condition of the current working condition to achieve continuous simulation.

6. The method for continuous simulation of stress and deformation during the manufacturing process of a thin-walled kitchen hot water container according to claim 1, characterized in that In step 10, the mesh model of the end cover and cylinder after the tooling correction is used as the initial model of the current working condition, and the stress data is used as the initial stress condition of the current working condition to achieve continuous simulation.

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