Three-dimensional simulation verification method and system based on BIM

Abstract

The invention relates to the related field of simulation verification of welding, discloses a BIM-based three-dimensional simulation verification method and system, and constructs a high-precision welding management implementation method in which reality is mapped to virtuality and reality data is corrected through virtual simulation in an analogue simulation mode. Simulation fitting can be carried out on thermal deformation of a workpiece joint at different positions in the welding process on the premise of condition synchronization, a small amount of change of the position of the joint relative to a cooling state when the current welding point is moved to the next welding point after welding is completed is judged, then a deviation correction value which should be made by the welding point is calculated, and the deviation correction value of the welding point is calculated. Compared with a welding control scheme in the prior art, more accurate welding seam positioning can be obtained, and the welding quality is improved.

Description

Technical Field

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

[0002] Welding is a very important material technology means in the manufacturing industry. Through welding, the connection and sealing of various materials can be completed, etc., which is an important core to ensure the long-term 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 prior art, the welding modes include manual welding and equipment automated welding. For equipment automated welding, a vision scheme is mostly used for the positioning of welding seams. However, whether it is the pre-positioning of the weld seam for cold workpieces before welding or the real-time thermal positioning of the weld seam during the welding process, there are various material influences or scheme defects, which will lead to the accuracy of weld seam positioning and cause insufficient welding quality. Summary of the Invention

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

[0005] To achieve the above purpose, the present invention provides the following technical solutions: A three-dimensional simulation verification method based on BIM includes: Obtain and import the perspective scan model of the workpiece to be welded, and perform spatial alignment on the perspective scan model within the welding coordinate system. The perspective scan model includes the external structure distribution and internal material distribution of the workpiece, and different materials and distributions all correspond to including heat influence characteristics; Set the welding environment parameters and welding parameters, and respectively perform the association and data synchronization of the physical simulation models for the welding environment and the workpiece to be welded. The physical simulation models are respectively used to simulate the heat diffusion in air and metal and the metal heat feedback; Set the welding starting point, perform step-by-step welding simulation according to the weld seam distribution and the minimum welding step, and perform simulation fitting of the environment and the workpiece through the physical simulation model to obtain the workpiece thermal deformation data; Update the perspective scan model and the welding seam based on the workpiece thermal deformation data to repeatedly execute the step-by-step welding simulation, and establish a thermally corrected weld seam route based on the simulation historical route. The thermally corrected weld seam route is positioned based on the welding coordinate system.

[0006] As a further solution of the present invention: The step of setting the welding starting point and performing step-by-step welding simulation according to the weld seam distribution and the minimum welding step includes: Identify the welding seam of the workpiece based on the perspective scanning model, and obtain the spatial distribution information of the welding seam in the welding coordinate system; Set the welding starting point based on the spatial distribution of the welding seam, and select the initial welding direction. The welding starting point represents the end of the welding seam or any point of the closed weld, and the initial welding direction is used to represent the welding progress direction; Obtain the minimum welding step of the current welding, and judge the seam orientation corresponding to the minimum welding step of the welding seam in the initial welding direction to generate a stepping control signal; Execute the stepping control signal to control the welding point to displace the minimum welding step along the seam orientation, and perform welding simulation at the target position. The welding simulation is used to add welding materials and simulate point heat sources to the perspective scanning model during the continuous time of spot welding.

[0007] As a further aspect of the present invention: In the step of performing simulation fitting of the environment and the workpiece through the physical simulation model to obtain the workpiece thermal deformation data, it includes heat diffusion simulation and workpiece deformation simulation; The heat diffusion simulation is used to represent the simulation process of the heat diffusion of the welding point in the workpiece and the environment. The heat diffusion simulation is associated with the initial environmental workpiece temperature, environmental medium parameters, workpiece material parameters, workpiece structure parameters, and workpiece material uniformity parameters; The workpiece deformation simulation is used to represent the simulation process of the thermal deformation state of the workpiece during heat diffusion. The workpiece deformation simulation is associated with the initial environmental workpiece temperature, workpiece material thermal parameters, material structure distribution of the workpiece, and heat diffusion state.

[0008] As a further aspect of the present invention: The step of updating the perspective scanning model and the welding seam based on the workpiece thermal deformation data to cyclically execute the step-by-step welding simulation and establish a corrected weld route includes: Assign values to the perspective scanning model based on the workpiece thermal deformation data corresponding to the simulation fitting of each welding step to perform thermal deformation correction of the workpiece; Re-identify the welding seam of the corrected perspective scanning model and update it according to the new coordinate position; Repeat the welding simulation step based on the updated welding seam to obtain a continuous number of minimum step records distributed in the welding coordinate system to establish a corrected weld route, and the corrected weld route is used to map the actual welding control.

[0009] As a further aspect of the present invention: It further includes the steps of: Establish initial mapping data based on the simulation data. The initial mapping data includes welding environment parameters, welding parameters, and the welding starting point; When performing a welding task, synchronize the current environment and parameters, and verify based on the initial mapping data. If the verification does not meet the requirements, output the corresponding environmental and parameter correction control signals. If the verification result meets the requirements, verify the welding starting point, and perform welding control through the thermally corrected weld path.

[0010] An embodiment of the present invention aims to provide a three-dimensional simulation verification system based on BIM, including: A workpiece synchronization module, configured to obtain and import a perspective scan model of the workpiece to be welded, and perform spatial alignment on the perspective scan model within the welding coordinate system. The perspective scan model includes the external structure distribution and internal material distribution of the workpiece, and different materials and distributions all correspond to including heat-affected characteristics. A simulation setting module, configured to set welding environment parameters and welding parameters, and perform association and data synchronization of physical simulation models for the welding environment and the workpiece to be welded respectively. The physical simulation models are respectively used to simulate heat diffusion in air and metal and metal heat feedback. A welding simulation module, configured to set the welding starting point, perform step-by-step welding simulation according to the weld joint distribution and the minimum welding step, and perform simulation fitting of the environment and the workpiece through the physical simulation model to obtain workpiece thermal deformation data. A welding correction module, configured to update the perspective scan model and the weld joint based on the workpiece thermal deformation data to repeatedly perform step-by-step welding simulation, and establish a thermally corrected weld path based on the simulation historical route. The thermally corrected weld path is positioned based on the welding coordinate system.

[0011] As a further solution of the present invention: The welding simulation module includes: A weld joint recognition unit, configured to recognize the weld joint of the workpiece based on the perspective scan model, and obtain the spatial distribution information of the weld joint within the welding coordinate system. An initial setting unit, configured to set the welding starting point based on the spatial distribution of the weld joint and select the initial welding direction. The welding starting point represents the end of the weld joint or any point of the closed weld, and the initial welding direction is used to represent the welding progress direction. A welding control unit, configured to obtain the minimum welding step of the current welding, judge the seam orientation corresponding to the minimum welding step of the weld joint in the initial welding direction, so as to generate a step control signal. A welding simulation unit, configured to execute the step control signal to control the welding point to displace the minimum welding step along the seam orientation, and perform welding simulation at the target position. The welding simulation is used to add welding materials and simulate point heat sources to the perspective scan model within the continuous time of spot welding.

[0012] As a further aspect of the present invention: in the welding simulation module, a heat diffusion simulation unit and a thermal deformation simulation unit are further included; The heat diffusion simulation unit is configured to perform heat diffusion simulation, and the heat diffusion simulation is used to characterize the simulation process of the heat diffusion of the welding point in the workpiece and the environment. The heat diffusion simulation is associated with the initial ambient workpiece temperature, environmental medium parameters, workpiece material parameters, workpiece structure parameters, and workpiece material uniformity parameters; The thermal deformation simulation unit is configured to perform workpiece deformation simulation, and the workpiece deformation simulation is used to characterize the simulation process of the thermal deformation state of the workpiece during heat diffusion. The workpiece deformation simulation is associated with the initial ambient workpiece temperature, workpiece material thermal parameters, material structure distribution of the workpiece, and heat diffusion state.

[0013] As a further aspect of the present invention: the welding correction module includes: A model correction assignment unit for assigning values to the perspective scanning model based on the workpiece thermal deformation data obtained by simulation fitting corresponding to each step of the welding simulation, so as to correct the thermal deformation of the workpiece; A seam correction positioning unit for re-positioning and identifying the welding seam of the corrected perspective scanning model and updating it according to the new coordinate position; A welding path generation unit for repeatedly performing welding simulation steps based on the updated welding seam to obtain several consecutive minimum step records distributed in the welding coordinate system, so as to establish a corrected weld path, and the corrected weld path is used to map the actual welding control.

[0014] As a further aspect of the present invention: a mapping control module is further included, specifically including: A parameter mapping unit for establishing initial mapping data based on the simulation data, and the initial mapping data includes welding environment parameters, welding parameters, and welding start points; A parameter verification unit for synchronizing the current environment and parameters when performing a welding task and verifying them based on the initial mapping data. If the verification does not conform, corresponding environment and parameter correction control signals are output; A welding control unit for verifying the welding start point if the verification result conforms and performing welding control through the thermal corrected weld path.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: By means of simulation, a high-precision welding management implementation method that maps reality to virtual and then corrects real data through virtual simulation is constructed. It can simulate and fit the thermal deformation of the workpiece joint at different positions during the welding process on the premise of synchronized conditions, and judge the small change in the position of the joint relative to the joint position in the cooled state when moving to the next welding point after the current welding point is completed, and then calculate the deviation correction value that the welding point should make. Compared with the welding control scheme of the prior art, it can obtain more accurate weld positioning and improve welding quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a flowchart of a three-dimensional simulation verification method based on BIM.

[0017] Figure 2 It is a flowchart of welding simulation in a three-dimensional simulation verification method based on BIM.

[0018] Figure 3 It is a block diagram of the composition of a three-dimensional simulation verification system based on BIM. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] In order to make the objectives, technical solutions and advantages of the present invention clearer, 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 used to limit the present invention.

[0020] The following describes in detail the specific implementation manners of the present invention with reference to specific embodiments.

[0021] As Figure 1 described, a three-dimensional simulation verification method based on BIM provided by an embodiment of the present invention includes the following steps: S10. Obtain and import a perspective scan model of the workpiece to be welded, and perform spatial alignment on the perspective scan model in the welding coordinate system. The perspective scan model includes the external structure distribution and internal material distribution of the workpiece, and different materials and distributions all correspond to including thermal influence characteristics; S20. Set welding environment parameters and welding parameters, and perform association and data synchronization of physical simulation models on the welding environment and the workpiece to be welded respectively. The physical simulation models are respectively used to simulate the heat diffusion in air and metal and the heat feedback of the metal; S30. Set the welding start point, perform step-by-step welding simulation according to the welding joint distribution and the minimum welding step, and perform simulation fitting of the environment and the workpiece through the physical simulation model to obtain workpiece thermal deformation data; S40. Update the perspective scanning model and the welding seam based on the workpiece thermal deformation data, so as to cyclically execute the step welding simulation, and establish a thermally corrected weld seam route according to the simulated historical route. The thermally corrected weld seam route is positioned based on the welding coordinate system.

[0022] In this embodiment, through the method of simulation, a high-precision welding management implementation method that maps from reality to virtual and then corrects real data through virtual simulation is constructed. It can realize the simulation fitting of the thermal deformation of the workpiece seam at different positions during the welding process on the premise of condition synchronization, and judge the small change relative to the seam position in the cooled state when moving to the next welding point after welding at the current welding point. Furthermore, calculate the deviation correction value that the welding point should make. Compared with the existing welding control scheme, it can obtain a more accurate welding seam positioning and improve the welding quality; when performing automated welding, the conventional technical scheme usually uses vision to position the welding seam, and then guides the welding according to the welding seam position. The vision guidance methods include guiding through the complete positioning of the weld seam before welding and real-time vision guidance during welding. For the former, because during the welding process, workpieces of different materials will all produce a certain degree of deformation at high temperatures, the weld seam positioning in the cooled state may deviate during welding (the different structural notches of the workpieces on both sides of the welding seam will all cause asymmetry in thermal deformation), resulting in a decrease in welding accuracy; for the latter, conventional vision includes vision schemes in the visible light band, vision schemes in the infrared band, etc. These vision schemes will all be interfered by the welding arc light generated during welding when used, and it is impossible to accurately judge the weld seam in real time through the vision scheme completely, and there are the following problems: First, the whole process needs to go through multiple data processes such as image acquisition - data processing - image recognition - weld seam determination, and control data establishment and feedback are required after the determination is completed. Multiple data processing processes will bring a long data delay. During welding, the thermal change of the weld seam is fast and tiny. Under such high delay, it is impossible to achieve real-time synchronous correction data feedback and impossible to achieve precise correction of the welding process; Second, based on the correction recognition method of image feature recognition, the minimum resolution is severely limited by the equipment. In actual use, the resolution is low, the sensitivity to subtle thermal deformation is low. At the same time, the high heat during welding will further reduce the local airflow stability, reduce the stability of light passing through, resulting in enhanced bending and scattering effects of light, further reducing the resolution and causing imaging jitter; Therefore, in this embodiment, a welding simulation is given in the same way as pre-simulation verification to obtain the thermal change of the workpiece in each step of welding, so as to realize the pre-correction of the weld seam route in the cooled state and achieve the purpose of welding control according to the pre-corrected weld seam.

[0023] Specifically, in order to achieve the 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 material uniformity distribution inside. After obtaining the perspective scan model including these data, align the pre-real space distribution of the workpiece in the simulation software to ensure the uniqueness of the conditions and the direct operability of the subsequent simulation results for direct mapping to reality. After completion of the alignment, it is necessary to synchronize the relevant 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, simulate that the welding process forms solder joints on the surface of the workpiece at a certain rate and continuously applies point heat sources. Through the physical simulation model, simulate the diffusion change of heat and the deformation state of the workpiece under the diffused heat. At this time, after completing the welding of the first solder joint, according to the position change of the weld seam, the precise position of the next solder joint can be determined. By repeating the cycle, the position of the weld seam offset under the influence of the reference heat can be established, and the precise correction of the weld seam can be achieved through simulation.

[0024] As Figure 2 shown, as another preferred embodiment of the present invention, the steps of setting the welding starting point and performing step-by-step welding simulation according to the weld seam distribution and the minimum welding step include: S31, identify the welding seam of the workpiece based on the perspective scan model, and obtain the spatial distribution information of the welding seam in the welding coordinate system; S32, set the welding starting point based on the spatial distribution of the welding seam, and select the initial welding direction. The welding starting point represents the end of the welding seam or any point of the closed weld seam, and the initial welding direction is used to represent the welding progress direction; S33, obtain the minimum welding step of the current welding, and judge the seam orientation corresponding to the minimum welding step of the welding seam in the initial welding direction to generate a step control signal; S34, execute the step control signal to control the welding point to displace the minimum welding step along the seam orientation, and perform welding simulation at the target point. The welding simulation is used to add welding materials and simulate point heat sources to the perspective scan model during the continuous time of spot welding.

[0025] In this embodiment, the process of welding simulation is supplemented. During welding, it is carried out through continuous spot welding (some welding methods will use continuous pressure welding methods, 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 the minimum welding step in this direction (i.e., the advancing distance of each step of welding). Therefore, the determination of the continuous execution points in the welding simulation can be carried out by determining the current point, the welding direction, and the minimum welding step, and the simulation of the welding heat source, that is, the material coverage, is carried out at the execution points.

[0026] As another preferred embodiment of the present invention, in the step of performing simulation fitting of the environment and the workpiece through a physical simulation model to obtain workpiece thermal deformation data, it includes heat diffusion simulation and workpiece deformation simulation; The heat diffusion simulation is used to characterize the simulation process of the heat diffusion of the welding point in the workpiece and the environment. The heat diffusion simulation is associated with the initial ambient 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 heat diffusion. The workpiece deformation simulation is associated with the initial ambient workpiece temperature, workpiece material thermal parameters, material structure distribution of the workpiece, and heat diffusion state.

[0027] In this embodiment, relevant descriptions are supplemented to the physical simulation model. Two main aspects of simulation need to be carried out. One is the simulation of heat diffusion, which involves materials science. Different materials and different material densities of the same material will result in differences in heat diffusion. The other is the thermal deformation simulation of the workpiece, which also involves materials science. Different materials will have different deformations when subjected to different temperature ranges. Therefore, accurate mapping of relevant material data and environmental data is required during simulation. Thus, the simulation verification method given in this embodiment is more applicable to high-precision material processing.

[0028] As another preferred embodiment of the present invention, the step of updating the perspective scanning model and the welding seam based on the workpiece thermal deformation data, cyclically performing step-by-step welding simulation, and establishing a corrected weld seam route according to the simulated historical route includes: Assign values to the perspective scanning model based on the workpiece thermal deformation data corresponding to the simulation fitting of each welding step to correct the thermal deformation of the workpiece; Re-identify the welding seam of the corrected perspective scanning model and update it according to the new coordinate position; Repeat the welding simulation step based on the updated welding seam to obtain several consecutive minimum step records distributed in the welding coordinate system to establish a corrected weld seam route, and the corrected weld seam route is used to map the actual welding control.

[0029] In this embodiment, step S40 is described in detail. The main content includes verifying and correcting the thermal deformation of the workpiece according to the simulation results of the previous welding point, determining the orientation of the next minimum welding step according to the corrected results, positioning the next welding point and performing welding simulation, and completing the simulation of the entire welding process through such a cycle to determine an accurate corrected weld seam route corrected by the simulation results.

[0030] As another preferred embodiment of the present invention, it further includes the steps of: Establish initial mapping data based on simulation data, where the initial mapping data includes welding environment parameters, welding parameters, and welding starting points; When performing a welding task, synchronize the current environment and parameters, and verify based on the initial mapping data. If the verification does not conform, correspondingly output environment and parameter correction control signals; If the verification result conforms, verify the welding starting point, and perform welding control through the thermal correction weld seam route.

[0031] 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 simulation results, environmental control is required to ensure the consistency of relevant factors. For high - requirement scenarios, it can also be carried out in a customized controllable closed environment, and the environmental control equipment is used to adjust the environmental parameter consistency in the closed place.

[0032] Such as Figure 3 shown, the present invention also provides a 3D simulation verification system based on BIM, which includes: A workpiece synchronization module 100, used to obtain and import the perspective scanning model of the workpiece to be welded, and perform spatial alignment of 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 all correspond to including thermal influence characteristics; A simulation setting module 200, used to set welding environment parameters and welding parameters, and perform the association and data synchronization of the physical simulation models for the welding environment and the workpiece to be welded respectively. The physical simulation models are respectively used to simulate the heat diffusion in air and metal and the heat feedback of the metal; A welding simulation module 300, used to set the welding starting point, perform step - by - step welding simulation according to the welding seam distribution and the minimum welding step, and perform simulation fitting of the environment and the workpiece through the physical simulation model to obtain workpiece thermal deformation data; A welding correction module 400, used to update the perspective scanning model and the welding seam based on the workpiece thermal deformation data, to circularly execute the step - by - step welding simulation, and establish a thermal correction weld seam route based on the simulation historical route. The thermal correction weld seam route is positioned based on the welding coordinate system.

[0033] As another preferred embodiment of the present invention, the welding simulation module includes: A weld seam recognition unit, used to recognize 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 for setting a welding start point based on the spatial distribution of a welding seam and selecting an initial welding direction, where the welding start point represents the end of the welding seam or any point of a closed weld, and the initial welding direction is used to represent the welding progress direction; A welding control unit for obtaining the minimum welding step of the current welding, and determining the seam orientation corresponding to the minimum welding step in the initial welding direction to generate a stepping control signal; A welding simulation unit for executing the stepping control signal to control the welding point to displace the minimum welding step along the seam orientation and perform welding simulation at the target position. The welding simulation is used to add welding materials and simulate point heat sources to the perspective scanning model during the continuous time of spot welding.

[0034] As another preferred embodiment of the present invention, in the welding simulation module, a heat diffusion simulation unit and a thermal deformation simulation unit are further included; The heat diffusion simulation unit is used to perform heat diffusion simulation, which is used to represent the simulation process of the heat diffusion of the welding point in the workpiece and the environment. The heat diffusion simulation is associated with the initial ambient 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 represent the simulation process of the thermal deformation state of the workpiece during heat diffusion. The workpiece deformation simulation is associated with the initial ambient workpiece temperature, workpiece material thermal parameters, material structure distribution of the workpiece, and heat diffusion state.

[0035] As another preferred embodiment of the present invention, the welding correction module includes: A model correction assignment unit for assigning values to the perspective scanning model based on the workpiece thermal deformation data obtained by simulating and fitting each welding step to correct the thermal deformation of the workpiece; A seam correction positioning unit for repositioning and identifying the welding seam of the corrected perspective scanning model and updating it according to the new coordinate position; A welding route generation unit for repeatedly executing the welding simulation steps based on the updated welding seam to obtain several consecutive minimum step records distributed in the welding coordinate system to establish a corrected weld route, and the corrected weld route is used to map the actual welding control.

[0036] As another preferred embodiment of the present invention, a mapping control module is further included, specifically including: A parameter mapping unit for establishing initial mapping data based on simulation data, where the initial mapping data includes welding environment parameters, welding parameters, and welding start points; A parameter verification unit, configured to synchronize the current environment and parameters when performing a welding task, verify based on initial mapping data, and if the verification does not conform, correspondingly output an environment and parameter correction control signal; A welding control unit, configured to verify the welding starting point if the verification result conforms, and perform welding control through the thermally corrected weld path.

[0037] Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be completed by instructing relevant hardware through a computer program. The program can be stored in a non-volatile computer-readable storage medium. When the program is executed, it can include the processes of the embodiments of the above methods. Among them, any reference to a memory, storage, database, or other medium used in the various embodiments provided in the present application can include non-volatile and / or volatile memories. Non-volatile memories can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memories can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), etc.

[0038] After considering the specification and the disclosure of the embodiments, those skilled in the art will readily conceive of other embodiments of the present disclosure. The present application is intended to cover any variations, uses, or adaptations of the present disclosure, which follow the general principles of the present disclosure and include known common knowledge or conventional technical means in the technical field not disclosed in the present disclosure. The specification and embodiments are only regarded as exemplary, and the true scope and spirit of the present disclosure are pointed out by the claims.

[0039] It should be understood that the present disclosure is not limited to the exact structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present disclosure is only limited by the appended claims.

Claims

1. A 3D simulation verification method based on BIM, characterized in that Comprising: Obtain and import the perspective scan model of the workpiece to be welded, and perform spatial alignment on the perspective scan model within the welding coordinate system. The perspective scan model includes the external structure distribution and internal material distribution of the workpiece, and different materials and distributions all correspond to heat-affected characteristics. Set the welding environment parameters and welding parameters, and respectively perform the association and data synchronization of the physical simulation models for the welding environment and the workpiece to be welded. The physical simulation models are respectively used to simulate the heat diffusion in air and metal and the heat feedback of the metal. Set the welding starting point, perform step-by-step welding simulation according to the welding seam distribution and the minimum welding step, and perform environmental and workpiece simulation fitting through the physical simulation model to obtain the workpiece thermal deformation data. Update the perspective scan model and the welding seam based on the workpiece thermal deformation data to repeatedly execute the step-by-step welding simulation, and establish a heat-corrected weld path based on the simulation historical path. The heat-corrected weld path is positioned based on the welding coordinate system.

2. The 3D simulation verification method based on BIM according to claim 1, wherein The step of setting the welding starting point and performing step-by-step welding simulation according to the weld seam distribution and the minimum welding step includes: Identify the welding seams of the workpiece based on the perspective scan model to obtain the spatial distribution information of the welding seams within the welding coordinate system. Set the welding starting point based on the spatial distribution of the welding seams and select the initial welding direction. The welding starting point represents the end of the welding seam or any point of the closed weld seam, and the initial welding direction is used to represent the welding progress direction. Obtain the minimum welding step of the current welding, and judge the seam orientation corresponding to the minimum welding step of the welding seam in the initial welding direction to generate a step control signal. Execute the step control signal to control the welding point to displace the minimum welding step along the seam orientation, and perform welding simulation at the target position. The welding simulation is used to add welding materials and simulate the point heat source to the perspective scan model during the continuous time of spot welding.

3. The 3D simulation verification method based on BIM according to claim 2, wherein The step of performing environmental and workpiece simulation fitting through the 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 represent the simulation process of the heat diffusion of the welding point in the workpiece and the environment. The heat diffusion simulation is associated with the initial environmental workpiece temperature, environmental medium parameters, workpiece material parameters, workpiece structure parameters, and workpiece material uniformity parameters. The workpiece deformation simulation is used to represent the simulation process of the thermal deformation state of the workpiece during heat diffusion. The workpiece deformation simulation is associated with the initial environmental workpiece temperature, workpiece material thermal parameters, the material structure distribution of the workpiece, and the heat diffusion state.

4. The 3D simulation verification method based on BIM according to claim 3, characterized in that, The step of updating the perspective scan model and the welding seam based on the workpiece thermal deformation data to repeatedly execute the step-by-step welding simulation and establish a corrected weld path according to the simulation historical path includes: Assign values to the perspective scan model based on the workpiece thermal deformation data corresponding to the simulation fitting of each welding step to perform thermal deformation correction of the workpiece. Re-identify the welding seams of the corrected perspective scan model and update according to the new coordinate positions. Repeat the welding simulation steps based on the updated welding seam to obtain several consecutive minimum step records distributed in the welding coordinate system, so as to establish a corrected weld path, and the corrected weld path is used to map the actual welding control.

5. The 3D simulation verification method based on BIM according to claim 1, wherein It further includes the steps of: Establish initial mapping data based on the simulation data, and the initial mapping data includes welding environment parameters, welding parameters and welding starting points; When performing a welding task, synchronize the current environment and parameters, and verify based on the initial mapping data. If the verification does not conform, correspondingly output an environment and parameter correction control signal; If the verification result conforms, verify the welding starting point, and perform welding control through the thermal corrected weld path.

6. The 3D simulation verification system based on BIM is characterized in that, It includes: A workpiece synchronization module, which is used to obtain and import the perspective scan model of the workpiece to be welded, and perform spatial alignment on the perspective scan model in the welding coordinate system. The perspective scan model includes the external structure distribution and internal material distribution of the workpiece, and different materials and distributions respectively include heat influence characteristics; A simulation setting module, which is used to set welding environment parameters and welding parameters, and perform the association and data synchronization of the physical simulation models for the welding environment and the workpiece to be welded respectively. The physical simulation models are respectively used to simulate the heat diffusion in air and metal and the heat feedback of the metal; A welding simulation module, which is used to set the welding starting point, perform step-by-step welding simulation according to the welding seam distribution and the minimum welding step, and perform simulation fitting of the environment and the workpiece through the physical simulation model to obtain workpiece thermal deformation data; A welding correction module, which is used to update the perspective scan model and the welding seam based on the workpiece thermal deformation data, so as to loop and execute the step-by-step welding simulation, and establish a thermal corrected weld path according to the simulation historical route. The thermal corrected weld path is positioned based on the welding coordinate system.

7. The 3D simulation verification system based on BIM according to claim 6, characterized in that The welding simulation module includes: A weld seam recognition unit, which is used to recognize the welding seam of the workpiece based on the perspective scan model, and obtain the spatial distribution information of the welding seam in the welding coordinate system; An initial setting unit, which is used to set the welding starting point based on the spatial distribution of the welding seam and select the initial welding direction. The welding starting point represents the end of the welding seam or any point of the closed weld seam, and the initial welding direction is used to represent the welding progress direction; A welding control unit, which is used to obtain the minimum welding step of the current welding, judge the seam orientation corresponding to the minimum welding step of the welding seam in the initial welding direction, so as to generate a step control signal; A welding simulation unit, which is used to execute the step control signal to control the welding point to displace the minimum welding step along the seam orientation, and perform welding simulation at the target position. The welding simulation is used to add welding materials and simulate point heat sources to the perspective scan model during the continuous time of spot welding.

8. The 3D simulation verification system based on BIM according to claim 7, characterized in that In the welding simulation module, there is also a heat diffusion simulation unit and a thermal deformation simulation unit; The heat diffusion simulation unit is used to perform heat diffusion simulation, and the heat diffusion simulation is used to represent the simulation process of the 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 thermal deformation simulation unit is used to perform workpiece deformation simulation, which is a simulation process for characterizing the thermal deformation state of a workpiece during heat diffusion. The workpiece deformation simulation is associated with the initial ambient workpiece temperature, the thermal parameters of the workpiece material, the material structure distribution of the workpiece, and the heat diffusion state.

9. The 3D simulation verification system based on BIM according to claim 8, wherein The welding correction module includes: A model correction assignment unit, which is used to assign values to the perspective scanning model based on the workpiece thermal deformation data corresponding to the simulation fitting of each welding simulation step to correct the thermal deformation of the workpiece. A seam correction positioning unit, which is used to re-identify the welding seam of the corrected perspective scanning model and update it according to the new coordinate position. A welding path generation unit, which is used to repeatedly execute the welding simulation steps based on the updated welding seam to obtain several consecutive minimum step records distributed in the welding coordinate system, so as to establish a corrected weld path, and the corrected weld path is used to map the actual welding control.

10. The 3D simulation verification system based on BIM according to claim 6, characterized in that It further includes a mapping control module, specifically including: A parameter mapping unit, which is used to establish initial mapping data based on the simulation data, and the initial mapping data includes welding environment parameters, welding parameters, and the welding start point. A parameter verification unit, which is used to synchronize the current environment and parameters when performing a welding task and verify them based on the initial mapping data. If the verification does not meet the requirements, corresponding environment and parameter correction control signals are output. A welding control unit, which is used to verify the welding start point if the verification result meets the requirements and perform welding control through the thermal corrected weld path.

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