BIM-based 3D simulation verification method and system

Abstract

The present invention relates to the field related to simulation verification of welding, and discloses a three-dimensional simulation verification method and system based on BIM. Through simulation, a high-precision welding management implementation method is constructed by mapping reality to virtuality and then correcting reality data through virtual simulation. The method can simulate and fit the thermal deformation of workpiece joints at different positions during the welding process under the premise of condition synchronization, judge the small change in the joint position relative to the cooling state when the current welding point is moved to the next welding point after welding, and then calculate the deviation correction value that should be made to the welding point. Compared with the welding control scheme of the prior art, more accurate weld positioning can be obtained, and the welding quality is improved.

Description

Technical Field

[0001] The present invention relates to the field of welding simulation verification, and in particular to a three-dimensional simulation verification method and system based on BIM. Background Art

[0002] Welding is a very important material technology in the manufacturing industry. Through welding, it can complete processing needs such as connection and sealing of various materials. It is an important core to ensure the long-term and stable use of equipment. The high quality of welding operations is directly related to the safety, reliability and service life of engineering structures.

[0003] In the existing technology, welding modes include manual welding and equipment automated welding. For equipment automated welding, visual solutions are often used to locate the welding seam. However, whether it is pre-positioning the weld of a cold workpiece before welding or performing real-time weld heat positioning during the welding process, there are various material influences or solution defects, which will lead to inaccurate weld positioning and cause insufficient welding quality. Summary of the Invention

[0004] The purpose of the present invention is to provide a BIM-based three-dimensional simulation verification method and system to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] The BIM-based 3D simulation verification method includes:

[0007] Obtain and import a perspective scan model of the workpiece to be welded, and spatially align the perspective scan model within the welding coordinate system, wherein the perspective scan model includes the external structure distribution and internal material distribution of the workpiece, and each of the different materials and distributions includes corresponding heat-affected features;

[0008] Setting welding environment parameters and welding parameters, and performing data synchronization by respectively linking the welding environment and the workpiece to be welded with a physical simulation model, wherein the physical simulation model is used to simulate heat diffusion in air and metal and heat feedback of the metal;

[0009] Set the welding starting point, perform step welding simulation based on the weld seam distribution and minimum welding step, and simulate the environment and workpiece through the physical simulation model to obtain the workpiece thermal deformation data;

[0010] The perspective scanning model and the welding seam are updated based on the workpiece thermal deformation data to cyclically perform step welding simulation, and a thermal correction weld route is established according to the simulation history route, and the thermal correction weld route is positioned based on the welding coordinate system.

[0011] As a further solution of the present invention, the step of setting the welding starting point and performing step welding simulation according to the weld distribution and the minimum welding step includes:

[0012] Identify the welding seams of the workpiece based on the perspective scanning model and obtain the spatial distribution information of the welding seams in the welding coordinate system;

[0013] Setting a welding starting point based on the spatial distribution of the weld seam and selecting an initial welding direction, wherein the welding starting point represents the end of the weld seam or any point of the closed weld seam, and the initial welding direction is used to represent the welding direction;

[0014] Obtaining the minimum welding step of the current welding, determining the joint orientation of the welding seam corresponding to the minimum welding step in the initial welding direction, and generating a step control signal;

[0015] The step control signal is executed to control the minimum welding step of the welding point along the seam and perform welding simulation at the target point. The welding simulation is used to add welding materials and simulate the point heat source of the perspective scanning model during the duration of spot welding.

[0016] As a further solution of the present invention: the step of performing simulation fitting of the environment and the workpiece by using a physical simulation model to obtain the workpiece thermal deformation data includes thermal diffusion simulation and workpiece deformation simulation;

[0017] The heat diffusion simulation is used to characterize the simulation process of heat diffusion of the welding point in the workpiece and the environment. The heat diffusion simulation is associated with the initial environment workpiece temperature, environmental medium parameters, workpiece material parameters, workpiece structure parameters and workpiece material uniformity parameters;

[0018] The workpiece deformation simulation is used to characterize the simulation process of the thermal deformation state of the workpiece during thermal diffusion. The workpiece deformation simulation is associated with the initial ambient workpiece temperature, workpiece material thermal parameters, workpiece material structure distribution and thermal diffusion state.

[0019] As a further embodiment of the present invention, the step of updating the perspective scanning model and the weld seam based on the workpiece thermal deformation data to cyclically execute the step welding simulation and establishing a corrected weld seam route according to the simulation history route includes:

[0020] Assign values ​​to the perspective scanning model based on the workpiece thermal deformation data corresponding to each step of the welding simulation to correct the thermal deformation of the workpiece;

[0021] Reposition and identify the weld seams on the corrected perspective scan model and update it according to the new coordinate position;

[0022] The welding simulation step is repeatedly performed based on the updated weld joint to obtain a number of consecutive minimum step records distributed in the welding coordinate system to establish a corrected weld route, wherein the corrected weld route is used to map the actual welding control.

[0023] As a further embodiment of the present invention, the following steps are also included:

[0024] Establishing initial mapping data based on the simulation data, wherein the initial mapping data includes welding environment parameters, welding parameters, and a welding starting point;

[0025] When executing a welding task, the current environment and parameters are synchronized and verified based on the initial mapping data. If the verification does not meet the requirements, the corresponding environment and parameter correction control signals are output;

[0026] If the verification result is consistent, the welding starting point is verified and welding control is performed through the thermal correction weld route.

[0027] The embodiment of the present invention aims to provide a BIM-based three-dimensional simulation verification system, comprising:

[0028] A workpiece synchronization module is used to obtain and import a perspective scanning model of the workpiece to be welded, and spatially align the perspective scanning model within the welding coordinate system. The perspective scanning model includes the external structure distribution and internal material distribution of the workpiece, and different materials and distributions each include corresponding heat-affected characteristics;

[0029] A simulation setting module is used to set welding environment parameters and welding parameters, and to associate and synchronize data with physical simulation models of the welding environment and the workpiece to be welded. The physical simulation models are used to simulate heat diffusion in air and metal, as well as heat feedback of the metal.

[0030] The welding simulation module is used to set the welding starting point, perform step welding simulation based on the welding seam distribution and the minimum welding step, and simulate the environment and workpiece through the physical simulation model to obtain the workpiece thermal deformation data;

[0031] The welding correction module is used to update the perspective scanning model and the welding seam based on the workpiece thermal deformation data to cyclically execute the step welding simulation and establish a thermal correction weld route according to the simulation history route, and the thermal correction weld route is positioned based on the welding coordinate system.

[0032] As a further solution of the present invention: the welding simulation module includes:

[0033] A weld identification unit is used to identify the weld seam of the workpiece based on the perspective scanning model and obtain the spatial distribution information of the weld seam in the welding coordinate system;

[0034] An initial setting unit, configured to set a welding starting point based on the spatial distribution of the weld seam and select an initial welding direction, wherein the welding starting point represents the end of the weld seam or any point of the closed weld seam, and the initial welding direction represents the welding direction;

[0035] The welding control unit is used to obtain the minimum welding step of the current welding, determine the joint direction of the welding seam corresponding to the minimum welding step in the initial welding direction, and generate a step control signal;

[0036] The welding simulation unit is used to execute the step control signal to control the welding point to move along the seam toward the minimum welding step and perform welding simulation at the target point. The welding simulation is used to add welding materials and simulate the point heat source on the perspective scanning model during the duration of spot welding.

[0037] As a further solution of the present invention: the welding simulation module further includes a heat diffusion simulation unit and a thermal deformation simulation unit;

[0038] The heat diffusion simulation unit is used to perform heat diffusion simulation, which is used to characterize the simulation process of heat diffusion from the welding point in the workpiece and the environment. The heat diffusion simulation is associated with the initial environment workpiece temperature, environmental medium parameters, workpiece material parameters, workpiece structure parameters and workpiece material uniformity parameters;

[0039] The thermal deformation simulation unit is used to perform workpiece deformation simulation, which is used to characterize the simulation process of the thermal deformation state of the workpiece during thermal diffusion. The workpiece deformation simulation is associated with the initial ambient workpiece temperature, workpiece material thermal parameters, workpiece material structure distribution and thermal diffusion state.

[0040] As a further embodiment of the present invention: the welding correction module includes:

[0041] The model correction assignment unit is used to assign values ​​to the perspective scanning model based on the workpiece thermal deformation data corresponding to each step of the welding simulation, so as to perform thermal deformation correction on the workpiece;

[0042] The seam correction and positioning unit is used to reposition and identify the welding seam on the corrected perspective scanning model and update it according to the new coordinate position;

[0043] The welding route generating unit is used to repeatedly execute the welding simulation steps based on the updated welding seam to obtain a plurality of consecutive minimum step records distributed in the welding coordinate system to establish a corrected weld route, wherein the corrected weld route is used to map the actual welding control.

[0044] As a further solution of the present invention, a mapping control module is further included, specifically including:

[0045] A parameter mapping unit, configured to establish initial mapping data based on the simulation data, wherein the initial mapping data includes welding environment parameters, welding parameters, and a welding starting point;

[0046] The parameter verification unit is used to synchronize the current environment and parameters when performing welding tasks, and verify them based on the initial mapping data. If the verification does not meet the requirements, the corresponding environment and parameter correction control signals are output;

[0047] The welding control unit is used to verify the welding starting point if the verification result is consistent, and to perform welding control through the thermal correction weld route.

[0048] Compared with the existing technology, the beneficial effect of the present invention is: through simulation, a high-precision welding management implementation method is constructed by mapping reality to virtuality and then correcting reality data through virtual simulation. It can realize simulation fitting of the thermal deformation of the workpiece joint at different positions during the welding process under the premise of condition synchronization, and judge the small change in the joint position relative to the cooling state when the current welding point is moved to the next welding point after welding is completed, and then calculate the deviation correction value that should be made to the welding point. Compared with the welding control scheme of the existing technology, more accurate weld positioning can be obtained, and the welding quality is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 This is a flowchart of the BIM-based 3D simulation verification method.

[0050] Figure 2 This is a flowchart of welding simulation in the BIM-based three-dimensional simulation verification method.

[0051] Figure 3 This is a block diagram of the composition of the BIM-based three-dimensional simulation verification system. DETAILED DESCRIPTION

[0052] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0053] The specific implementation of the present invention is described in detail below with reference to specific embodiments.

[0054] like Figure 1 The BIM-based three-dimensional simulation verification method provided in one embodiment of the present invention includes the following steps:

[0055] S10, obtaining and importing a perspective scanning model of the workpiece to be welded, and spatially aligning the perspective scanning model in a welding coordinate system, wherein the perspective scanning model includes an external structural distribution and an internal material distribution of the workpiece, and each of different materials and distributions includes corresponding heat-affected features;

[0056] S20, setting welding environment parameters and welding parameters, and performing association and data synchronization of physical simulation models for the welding environment and the workpiece to be welded, wherein the physical simulation models are used to simulate heat diffusion in air and metal and heat feedback of the metal;

[0057] S30, setting the welding starting point, performing step welding simulation according to the welding seam distribution and the minimum welding step, and performing simulation fitting of the environment and the workpiece through a physical simulation model to obtain workpiece thermal deformation data;

[0058] S40, updating the perspective scanning model and the weld seam based on the workpiece thermal deformation data to cyclically execute the step welding simulation, and establishing a thermal correction weld seam route according to the simulation history route, wherein the thermal correction weld seam route is positioned based on the welding coordinate system.

[0059] In this embodiment, a high-precision welding management implementation method is constructed by mapping reality to virtuality and then correcting reality data through virtual simulation. It can realize the simulation fitting of the thermal deformation of the workpiece joint at different positions during the welding process under the premise of condition synchronization, judge the small change of the joint position relative to the cooling state when the current weld point is moved to the next weld point after welding, and then calculate the deviation correction value that the weld point should make. Compared with the welding control scheme of the prior art, it can obtain more accurate welding joint positioning and improve welding quality. When performing automated welding, conventional technical solutions usually use visual methods to locate the welding joint, and then guide the welding according to the welding joint position. The visual guidance method includes two methods: guidance through complete positioning of the weld before welding and real-time visual guidance during welding. For the former, because workpieces of different materials will produce a certain degree of deformation at high temperature during the welding process, the weld positioning in the cooling state may produce a certain offset during welding (the difference in the structural gaps of the workpieces on both sides of the welding joint will cause asymmetry in thermal deformation), thereby reducing the welding accuracy. For the latter, conventional vision includes visual solutions in the visible light band, infrared vision, and infrared vision. Band vision solutions, etc., when used, these vision solutions will be affected by the welding arc light interference generated during welding, and cannot fully and accurately judge the weld in real time through the vision solution, and there are the following problems: First, the entire process needs to go through multiple data processes such as image acquisition-data processing-image recognition-weld judgment, and after the judgment is completed, control data establishment and feedback need to be performed. Multiple data processing processes will bring long data delays. During welding, the thermal changes of the weld are rapid and tiny. Under such high delays, it is impossible to achieve real-time synchronous correction data feedback, and it is impossible to achieve accurate correction of the welding process; secondly In the correction recognition method based on image feature recognition, the minimum resolution is severely limited by the equipment, the resolution is low in actual use, and the sensitivity to slight thermal deformation is low. At the same time, the high heat in welding will further lead to a decrease in the stability of the local airflow, reduce the stability of the light passing through, and lead to an increase in the bending and scattering effects of the light, further reducing the resolution and causing imaging jitter; therefore, this embodiment provides a method similar to the pre-simulation verification to perform welding simulation, thereby obtaining the thermal changes of the workpiece in each step of welding, so as to realize the pre-correction of the weld path in the cooling state, and achieve the purpose of welding control based on the pre-corrected weld.

[0060] Specifically, in order to achieve thermal simulation of the workpiece, it is first necessary to scan the workpiece to obtain its structural distribution, including the structural distribution of the appearance and the internal material uniformity distribution. After obtaining the perspective scanning model including these data, the pre-real space distribution of the workpiece is aligned in the simulation software to ensure the uniqueness of the conditions and the direct operability of the subsequent simulation results to be directly mapped to reality; after the alignment is completed, it is necessary to synchronize the related influencing parameters such as environmental data to ensure the accuracy of the simulation. After completing these basic settings, the welding simulation process can be carried out. During the simulation, the welding process is simulated to form welds at a certain rate on the surface of the workpiece, and a point heat source is continuously applied. The heat diffusion change and the deformation state of the workpiece under the diffused heat are simulated through the physical simulation model. After the welding of the first weld is completed, the precise position of the next weld can be determined according to the position change of the weld. Repeating the cycle can establish the weld position after offset under the influence of reference heat, and realize accurate correction of the weld through simulation.

[0061] like Figure 2 As shown, as another preferred embodiment of the present invention, the steps of setting the welding starting point and performing step welding simulation according to the weld distribution and the minimum welding step include:

[0062] S31, identifying the welding seam of the workpiece based on the perspective scanning model, and obtaining spatial distribution information of the welding seam in the welding coordinate system;

[0063] S32, setting a welding starting point based on the spatial distribution of the weld seam and selecting an initial welding direction, wherein the welding starting point represents the end of the weld seam or any point of the closed weld seam, and the initial welding direction is used to represent the welding direction;

[0064] S33, obtaining the minimum welding step of the current welding, determining the joint direction of the welding seam corresponding to the minimum welding step in the initial welding direction, and generating a step control signal;

[0065] S34, executing the step control signal to control the welding point to move along the seam toward the minimum welding step, and performing welding simulation at the target point, wherein the welding simulation is used to perform welding material addition and point heat source simulation on the perspective scanning model during the duration of spot welding.

[0066] In this embodiment, the welding simulation process is supplemented. When welding is performed, it is performed through continuous spot welding (some welding methods will use continuous pressure welding, but the minimum welding step can also be established by splitting the unit distance). Therefore, in each step of welding, there will be a welding direction and a minimum welding step under the direction (that is, the forward distance of each welding step). Therefore, the continuous execution point in the welding simulation can be determined by determining the current point, determining the welding direction and determining the minimum welding step, and the welding heat source, that is, the material coverage, can be simulated at the execution point.

[0067] As another preferred embodiment of the present invention, the step of performing simulation fitting of the environment and the workpiece by a physical simulation model to obtain the workpiece thermal deformation data includes thermal diffusion simulation and workpiece deformation simulation;

[0068] The heat diffusion simulation is used to characterize the simulation process of heat diffusion of the welding point in the workpiece and the environment. The heat diffusion simulation is associated with the initial environment workpiece temperature, environmental medium parameters, workpiece material parameters, workpiece structure parameters and workpiece material uniformity parameters;

[0069] The workpiece deformation simulation is used to characterize the simulation process of the thermal deformation state of the workpiece during thermal diffusion. The workpiece deformation simulation is associated with the initial ambient workpiece temperature, workpiece material thermal parameters, workpiece material structure distribution and thermal diffusion state.

[0070] In this embodiment, relevant explanations are added to the physical simulation model. Two main aspects of simulation need to be performed. One is the simulation of heat diffusion, which involves materials science. Different materials and different material densities of the same material will lead to differences in heat diffusion. The second is the simulation of thermal deformation of the workpiece, which also involves materials science. Different materials will have different deformations when subjected to different temperature ranges. Therefore, when performing simulation, accurate mapping of relevant material data and environmental data is required. Therefore, the simulation verification method given in this embodiment is more suitable for high-precision material processing.

[0071] As another preferred embodiment of the present invention, the steps of updating the perspective scanning model and the weld seam based on the workpiece thermal deformation data to cyclically execute the step welding simulation and establishing a corrected weld seam route according to the simulation history route include:

[0072] Assign values ​​to the perspective scanning model based on the workpiece thermal deformation data corresponding to each step of the welding simulation to correct the thermal deformation of the workpiece;

[0073] Reposition and identify the weld seams on the corrected perspective scan model and update it according to the new coordinate position;

[0074] The welding simulation step is repeatedly performed based on the updated weld joint to obtain a number of consecutive minimum step records distributed in the welding coordinate system to establish a corrected weld route, wherein the corrected weld route is used to map the actual welding control.

[0075] In this embodiment, step S40 is described in a distributed manner, which mainly includes verifying and correcting the thermal deformation of the workpiece based on the simulation results of the previous welding point, determining the direction of the next minimum welding step based on the corrected results, locating the next welding point and performing welding simulation. Through such a cycle, the simulation of the entire welding process is completed, thereby determining an accurate corrected weld route corrected by the simulation results.

[0076] As another preferred embodiment of the present invention, the steps are further included:

[0077] Establishing initial mapping data based on the simulation data, wherein the initial mapping data includes welding environment parameters, welding parameters, and a welding starting point;

[0078] When executing a welding task, the current environment and parameters are synchronized and verified based on the initial mapping data. If the verification does not meet the requirements, the corresponding environment and parameter correction control signals are output;

[0079] If the verification result is consistent, the welding starting point is verified and welding control is performed through the thermal correction weld route.

[0080] In this embodiment, the purpose is to realize the mapping of simulation verification data to actual welding processing. Therefore, in order to achieve the mapping accuracy of the simulation results, environmental control is required to ensure the consistency of correlation factors. For high-demand scenarios, it can also be carried out in a customized controllable closed environment, and the relevant environmental control equipment can adjust the consistency of environmental parameters in the closed place.

[0081] like Figure 3 As shown, the present invention also provides a three-dimensional simulation verification system based on BIM, which includes:

[0082] The workpiece synchronization module 100 is used to obtain and import a perspective scanning model of the workpiece to be welded, and spatially align the perspective scanning model in the welding coordinate system. The perspective scanning model includes the external structure distribution and internal material distribution of the workpiece, and different materials and distributions each include corresponding heat-affected characteristics;

[0083] The simulation setting module 200 is used to set welding environment parameters and welding parameters, and to associate and synchronize data of the welding environment and the workpiece to be welded with physical simulation models, wherein the physical simulation models are used to simulate heat diffusion in air and metal and heat feedback of the metal;

[0084] The welding simulation module 300 is used to set the welding starting point, perform step welding simulation based on the weld seam distribution and the minimum welding step, and simulate the environment and workpiece through a physical simulation model to obtain workpiece thermal deformation data;

[0085] The welding correction module 400 is used to update the perspective scanning model and the welding seam based on the workpiece thermal deformation data to cyclically execute the step welding simulation and establish a thermal correction weld route according to the simulation history route. The thermal correction weld route is positioned based on the welding coordinate system.

[0086] As another preferred embodiment of the present invention, the welding simulation module includes:

[0087] A weld identification unit is used to identify the weld seam of the workpiece based on the perspective scanning model and obtain the spatial distribution information of the weld seam in the welding coordinate system;

[0088] An initial setting unit, configured to set a welding starting point based on the spatial distribution of the weld seam and select an initial welding direction, wherein the welding starting point represents the end of the weld seam or any point of the closed weld seam, and the initial welding direction represents the welding direction;

[0089] The welding control unit is used to obtain the minimum welding step of the current welding, determine the joint direction of the welding seam corresponding to the minimum welding step in the initial welding direction, and generate a step control signal;

[0090] The welding simulation unit is used to execute the step control signal to control the welding point to move along the seam toward the minimum welding step and perform welding simulation at the target point. The welding simulation is used to add welding materials and simulate the point heat source on the perspective scanning model during the duration of spot welding.

[0091] As another preferred embodiment of the present invention, the welding simulation module further includes a heat diffusion simulation unit and a thermal deformation simulation unit;

[0092] The heat diffusion simulation unit is used to perform heat diffusion simulation, which is used to characterize the simulation process of heat diffusion from the welding point in the workpiece and the environment. The heat diffusion simulation is associated with the initial environment workpiece temperature, environmental medium parameters, workpiece material parameters, workpiece structure parameters and workpiece material uniformity parameters;

[0093] The thermal deformation simulation unit is used to perform workpiece deformation simulation, which is used to characterize the simulation process of the thermal deformation state of the workpiece during thermal diffusion. The workpiece deformation simulation is associated with the initial ambient workpiece temperature, workpiece material thermal parameters, workpiece material structure distribution and thermal diffusion state.

[0094] As another preferred embodiment of the present invention, the welding correction module includes:

[0095] The model correction assignment unit is used to assign values ​​to the perspective scanning model based on the workpiece thermal deformation data corresponding to each step of the welding simulation, so as to perform thermal deformation correction on the workpiece;

[0096] The seam correction and positioning unit is used to reposition and identify the welding seam on the corrected perspective scanning model and update it according to the new coordinate position;

[0097] The welding route generating unit is used to repeatedly execute the welding simulation steps based on the updated welding seam to obtain a plurality of consecutive minimum step records distributed in the welding coordinate system to establish a corrected weld route, wherein the corrected weld route is used to map the actual welding control.

[0098] As another preferred embodiment of the present invention, a mapping control module is further included, specifically including:

[0099] A parameter mapping unit, configured to establish initial mapping data based on the simulation data, wherein the initial mapping data includes welding environment parameters, welding parameters, and a welding starting point;

[0100] The parameter verification unit is used to synchronize the current environment and parameters when performing welding tasks, and verify them based on the initial mapping data. If the verification does not meet the requirements, the corresponding environment and parameter correction control signals are output;

[0101] The welding control unit is used to verify the welding starting point if the verification result is consistent, and to perform welding control through the thermal correction weld route.

[0102] Those skilled in the art will appreciate that all or part of the processes in the above-described method embodiments can be implemented by instructing the relevant hardware through a computer program. The program can be stored in a non-volatile computer-readable storage medium. When executed, the program can include the processes of the above-described method embodiments. Any reference to memory, storage, database, or other media used in the various embodiments provided herein may include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), RAMbus direct RAM (RDRAM), direct RAMbus dynamic RAM (DRDRAM), and RAMbus dynamic RAM (RDRAM).

[0103] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the disclosure in the specification and examples. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered merely as exemplary, and the true scope and spirit of the present disclosure are indicated by the claims.

[0104] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes can be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. The three-dimensional simulation verification method based on BIM is characterized by: Include: Obtain and import a perspective scan model of the workpiece to be welded, and spatially align the perspective scan model within the welding coordinate system, wherein the perspective scan model includes the external structure distribution and internal material distribution of the workpiece, and each of the different materials and distributions includes corresponding heat-affected features; Setting welding environment parameters and welding parameters, and associating and synchronizing data between the welding environment and the workpiece to be welded with a physical simulation model, wherein the physical simulation model is used to simulate heat diffusion in air and metal and heat feedback of the metal; Set the welding starting point, perform step welding simulation based on the weld seam distribution and minimum welding step, and simulate the environment and workpiece through the physical simulation model to obtain the workpiece thermal deformation data; The perspective scanning model and the welding seam are updated based on the workpiece thermal deformation data to cyclically perform step welding simulation, and a thermal correction weld route is established according to the simulation history route, and the thermal correction weld route is positioned based on the welding coordinate system.

2. The BIM-based three-dimensional simulation verification method according to claim 1, characterized in that: The steps of setting the welding starting point and performing step welding simulation according to the weld distribution and the minimum welding step include: Identify the welding seams of the workpiece based on the perspective scanning model and obtain the spatial distribution information of the welding seams in the welding coordinate system; Setting a welding starting point based on the spatial distribution of the weld seam and selecting an initial welding direction, wherein the welding starting point represents the end of the weld seam or any point of the closed weld seam, and the initial welding direction is used to represent the welding direction; Obtaining the minimum welding step of the current welding, determining the joint orientation of the welding seam corresponding to the minimum welding step in the initial welding direction, and generating a step control signal; The step control signal is executed to control the welding point to move along the seam toward the minimum welding step, and a welding simulation is performed at the target point. The welding simulation is used to add welding materials and simulate a point heat source on the perspective scanning model during the duration of the spot welding.

3. The BIM-based three-dimensional simulation verification method according to claim 2, characterized in that: The step of performing simulation fitting of the environment and the workpiece by using a physical simulation model to obtain the workpiece thermal deformation data includes heat diffusion simulation and workpiece deformation simulation; The heat diffusion simulation is used to characterize the simulation process of heat diffusion of the welding point in the workpiece and the environment. The heat diffusion simulation is associated with the initial environment workpiece temperature, environmental medium parameters, workpiece material parameters, workpiece structure parameters and workpiece material uniformity parameters; The workpiece deformation simulation is used to characterize the simulation process of the thermal deformation state of the workpiece during thermal diffusion. The workpiece deformation simulation is associated with the initial ambient workpiece temperature, workpiece material thermal parameters, workpiece material structure distribution and thermal diffusion state.

4. The BIM-based three-dimensional simulation verification method according to claim 3, characterized in that: The steps of updating the perspective scanning model and the weld seam based on the workpiece thermal deformation data to cyclically execute the step welding simulation and establishing a corrected weld seam route according to the simulation history route include: Assign values ​​to the perspective scanning model based on the workpiece thermal deformation data corresponding to each step of the welding simulation to correct the thermal deformation of the workpiece; Reposition and identify the weld seams on the corrected perspective scan model and update it according to the new coordinate position; The welding simulation step is repeatedly performed based on the updated weld joint to obtain a plurality of consecutive minimum step records distributed in the welding coordinate system to establish a corrected weld route, wherein the corrected weld route is used to map the actual welding control.

5. The BIM-based three-dimensional simulation verification method according to claim 1, characterized in that: Also includes the steps: Establishing initial mapping data based on the simulation data, wherein the initial mapping data includes welding environment parameters, welding parameters, and a welding starting point; When executing a welding task, the current environment and parameters are synchronized and verified based on the initial mapping data. If the verification does not meet the requirements, the corresponding environment and parameter correction control signals are output; If the verification result is consistent, the welding starting point is verified and welding control is performed through the thermal correction weld route.

6. The BIM-based three-dimensional simulation verification system is characterized by: Include: A workpiece synchronization module is used to obtain and import a perspective scanning model of the workpiece to be welded, and spatially align the perspective scanning model within the welding coordinate system. The perspective scanning model includes the external structure distribution and internal material distribution of the workpiece, and different materials and distributions each include corresponding heat-affected characteristics; A simulation setting module is used to set welding environment parameters and welding parameters, and to associate and synchronize data between the physical simulation model of the welding environment and the workpiece to be welded. The physical simulation model is used to simulate heat diffusion in air and metal and metal heating feedback; The welding simulation module is used to set the welding starting point, perform step welding simulation based on the welding seam distribution and the minimum welding step, and simulate the environment and workpiece through the physical simulation model to obtain the workpiece thermal deformation data; The welding correction module is used to update the perspective scanning model and the welding seam based on the workpiece thermal deformation data to cyclically execute the step welding simulation and establish a thermal correction weld route according to the simulation history route, and the thermal correction weld route is positioned based on the welding coordinate system.

7. The BIM-based three-dimensional simulation verification system according to claim 6, characterized in that: The welding simulation module includes: A weld identification unit is used to identify the weld seam of the workpiece based on the perspective scanning model and obtain the spatial distribution information of the weld seam in the welding coordinate system; An initial setting unit, configured to set a welding starting point based on the spatial distribution of the weld seam and select an initial welding direction, wherein the welding starting point represents the end of the weld seam or any point of the closed weld seam, and the initial welding direction represents the welding direction; The welding control unit is used to obtain the minimum welding step of the current welding, determine the joint direction of the welding seam corresponding to the minimum welding step in the initial welding direction, and generate a step control signal; The welding simulation unit is used to execute the step control signal to control the welding point to move along the seam toward the minimum welding step and perform welding simulation at the target point. The welding simulation is used to add welding materials and simulate the point heat source on the perspective scanning model during the duration of spot welding.

8. The BIM-based three-dimensional simulation verification system according to claim 7, characterized in that: The welding simulation module also includes a heat diffusion simulation unit and a thermal deformation simulation unit; The heat diffusion simulation unit is used to perform heat diffusion simulation, which is used to characterize the simulation process of heat diffusion from the welding point in the workpiece and the environment. The heat diffusion simulation is associated with the initial environment workpiece temperature, environmental medium parameters, workpiece material parameters, workpiece structure parameters and workpiece material uniformity parameters; The thermal deformation simulation unit is used to perform workpiece deformation simulation, which is used to characterize the simulation process of the thermal deformation state of the workpiece during thermal diffusion. The workpiece deformation simulation is associated with the initial ambient workpiece temperature, workpiece material thermal parameters, workpiece material structure distribution and thermal diffusion state.

9. The BIM-based three-dimensional simulation verification system according to claim 8, characterized in that: The welding correction module includes: The model correction assignment unit is used to assign values ​​to the perspective scanning model based on the workpiece thermal deformation data corresponding to each step of the welding simulation, so as to perform thermal deformation correction on the workpiece; The seam correction and positioning unit is used to reposition and identify the welding seam on the corrected perspective scanning model and update it according to the new coordinate position; The welding route generating unit is used to repeatedly execute the welding simulation steps based on the updated welding seam to obtain a plurality of consecutive minimum step records distributed in the welding coordinate system to establish a corrected weld route, wherein the corrected weld route is used to map the actual welding control.

10. The BIM-based three-dimensional simulation verification system according to claim 6, characterized in that: It also includes a mapping control module, specifically including: A parameter mapping unit, configured to establish initial mapping data based on the simulation data, wherein the initial mapping data includes welding environment parameters, welding parameters, and a welding starting point; The parameter verification unit is used to synchronize the current environment and parameters when performing welding tasks, and verify them based on the initial mapping data. If the verification does not meet the requirements, the corresponding environment and parameter correction control signals are output; The welding control unit is used to verify the welding starting point if the verification result is consistent, and to perform welding control through the thermal correction weld route.

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