CN113391598B - A virtual assembly simulation method and system - Google Patents

Abstract

A virtual assembly simulation method and system of the present invention relates to a method and system for visual assembly of a product model. The purpose is to overcome the problem that the existing design first performs function and size design, and then performs assembly verification through physical products, which may easily lead to product zero. There is a problem of deviation in the fitting size of the components. The specific steps of the method are as follows: S1, import the assembly model; S2, generate the first assembly sequence according to the complete assembly model; S3, use the virtual tooling, use the reference assembly sequence to zero The component model is visualized, and the second assembly sequence is generated; S4, the second assembly sequence is optimized and updated by the assembly process optimization algorithm, and the original reference assembly sequence is replaced with the updated second assembly sequence, and the process returns to step S3; or the assembly is completed, and the end Virtual assembly simulation.

Description

A virtual assembly simulation method and system

technical field

The present invention relates to a method and system for visual assembly of product models.

Background technique

At this stage, the manufacturing industry relies on CAD/CAM software to achieve rapid product design, automatic and integrated processing. However, the assembly of the product still adopts the method of first designing and processing, and then using the actual product for assembly verification, and the assembly efficiency is low. In particular, complex products (such as airplanes, automobiles, etc.) are usually developed through cooperation between multiple departments or multiple companies. The existing design generally first designs the function and size of the parts, and then assembles the physical products for verification. Pre-design and post-assembly are relatively independent, and assembly and design cannot share data. If these departments or development companies have poor communication, it may cause deviations in the matching dimensions of product parts, failing to meet the design requirements, resulting in a waste of human, material and financial resources.

Therefore, it is necessary to study the virtual assembly system and its technology, which can avoid the duplication of physical model, improve the efficiency of product design, and greatly shorten the development cycle and cost of the product. This system is used to plan the assembly process of mechanical products, inspect the assembly process and realize the visualization of the assembly process.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a virtual assembly simulation method and system in order to overcome the problem that the existing design first performs function and size design, and then performs assembly verification through physical products, which easily leads to deviations in the matching dimensions of product parts.

A virtual assembly simulation method of the present invention, the specific steps of the method are as follows:

S1. Import the assembly model;

S2. Generate a first assembly sequence according to the complete assembly model;

The first assembly sequence is an assembly sequence that does not consider the virtual tooling to participate in the assembly;

S3. Use virtual tooling to visualize the component model using the reference assembly sequence, and generate a second assembly sequence;

Visual operations include: selecting and controlling the corresponding virtual tooling, and assembling or disassembling the corresponding component model through the corresponding virtual tooling; and selecting and controlling the corresponding component model to directly assemble or disassemble;

The first assembly sequence is initially used with reference to the assembly sequence; the second assembly sequence is an assembly sequence that considers the virtual tooling to participate in the assembly;

S4, using the assembly process optimization algorithm to optimize and update the second assembly sequence, replace the original reference assembly sequence with the updated second assembly sequence, and return to step S3;

Or complete the assembly to end the virtual assembly simulation.

Wherein, the specific method for generating the first assembly sequence in step S2 is as follows:

S21. According to the order of the assembly level of the current assembly model from the outside to the inside, disassemble each component model along a plurality of set disassembly directions; and obtain the interference detection results during the disassembly process, and establish the component interference surface;

S22, compare each disassembly direction in the parts interference table, obtain the disassembly direction with the least interference, record the disassembly direction and the model of the detachable parts in the disassembly direction, and add the disassembly sequence;

The detachable component model is a component model without interference in the detachment direction;

S23, remove the detachable component model in step S22, update the assembly model, and return to step S21;

Until all the component models become detachable component models, the final disassembly sequence is obtained, and the process goes to step S24;

S24. Reverse the final disassembly sequence to obtain an assembly sequence.

Wherein, the specific method of step S21 is as follows:

S211. Obtain the feature size of a component model, move the component model along a set disassembly direction and obtain an interference detection result, and the moving distance is equal to the feature size;

S212, according to the interference situation of the component model, the corresponding interference mark in the component interference table;

If the component model interferes in the disassembly direction, the corresponding position in the component interference table will be filled with interference marks; otherwise, the non-interference marks will be filled;

S213, change the disassembly direction, and return to step S211; until the interference of the component model in all the disassembly directions is filled into the parts interference table, execute step S214;

S214 , replacing the component model, and returning to step S211 ; until the interference conditions of all the component models in all disassembly directions are filled into the component interference table, the establishment of the component interference table is completed.

Wherein, step S1 also includes:

S11. Generate a virtual collision mesh outline of the component model, and obtain the position of the component model and the position of the virtual tooling;

S12. Display the component model and the virtual tooling.

Wherein, the interference detection result in step S211 is obtained through the following steps:

According to the virtual collision mesh outline of the component model and the position of the component model, the assembly parameters during the visualization operation are obtained;

Assembly parameters include interference detection results for component models.

A virtual assembly simulation system of the present invention includes a model processing module, an assembly process planning module and a virtual assembly visualization operation module;

Model processing module for importing assembly models;

The assembly process planning module is connected with the model processing module, and is used for generating the first assembly sequence according to the complete assembly model;

The first assembly sequence is an assembly sequence that does not consider the virtual tooling to participate in the assembly;

The virtual assembly visualization operation module is connected with the model processing module and the assembly process planning module at the same time, and is used to use the virtual tooling, use the reference assembly sequence to visualize the component model, and generate the second assembly sequence;

Visual operations include: selecting and controlling the corresponding virtual tooling, and assembling or disassembling the corresponding component model through the corresponding virtual tooling; and selecting and controlling the corresponding component model to directly assemble or disassemble;

The first assembly sequence is initially used with reference to the assembly sequence; the second assembly sequence is an assembly sequence that considers the virtual tooling to participate in the assembly;

The assembly process planning module is further configured to optimize and update the second assembly sequence by using the assembly process optimization algorithm, replace the original reference assembly sequence with the updated second assembly sequence, and send the new reference assembly sequence to the virtual assembly visualization operation module.

The assembly process planning module includes an interference table generation module, a disassembly sequence generation module, a process planning cycle module and an assembly sequence generation module;

The interference table generation module is used to disassemble each component model along multiple set disassembly directions according to the assembly level of the current assembly model from the outside to the inside; and obtain the interference detection results during the disassembly process. , to establish a component interference table;

The disassembly sequence generation module is connected with the interference table generation module, and is used to compare each disassembly direction in the component interference table, obtain the disassembly direction with the least interference, record the disassembly direction and the detachable component model in the disassembly direction, Join the disassembly sequence;

The detachable component model is a component model without interference in the detachment direction;

The process planning cycle module is connected with the interference table generation module and the disassembly sequence generation module at the same time, and is used to receive the disassembly sequence, remove the detachable component model in the disassembly sequence, update the assembly model and send it to the interference table generation module;

Until all component models become detachable component models, the final disassembly sequence is obtained;

The assembly sequence generation module is connected with the process planning cycle module, and is used for receiving the final disassembly sequence, and reverses the final disassembly sequence to obtain the assembly sequence.

The interference table generation module includes a component model moving module, an interference marking module, a disassembly direction switching cycle module, and a component switching cycle module;

The component model moving module is used to obtain the feature size of a component model, move the component model along a set disassembly direction and obtain the interference detection result, and the moving distance is equal to the feature size;

The interference mark module is connected with the component model movement module, and is used to create the corresponding interference mark in the component interference table according to the interference situation of the component model, and generate the disassembly direction switching signal after the interference mark in the disassembly direction is filled;

If the component model interferes in the disassembly direction, the corresponding position in the component interference table will be filled with interference marks; otherwise, the non-interference marks will be filled;

The disassembly direction switching cycle module is connected with the component model moving module and the interference mark module at the same time, and is used to receive the disassembly direction switching signal, change the disassembly direction, and send it to the component model moving module;

Until the interference of the component model in all disassembly directions is filled into the component interference table, the component switching signal is generated and sent to the component switching cycle module;

The component switching cycle module is connected with the disassembly direction switching cycle module and the component model moving module at the same time, and is used to receive the component switching signal, replace the component model, and send it to the component model moving module;

Until the interference of all component models in all disassembly directions is filled into the component interference table, the establishment of the component interference table is completed.

Among them, the model processing module is also used to generate the virtual collision mesh outline of the component model, and obtain the position of the component model and the position of the virtual tool;

The virtual assembly visualization operation module is also used to display component models and virtual tooling.

Among them, it also includes the assembly parameter calculation module;

The assembly parameter calculation module is connected with the interference table generation module, and is used to calculate the assembly parameters during the visualization operation according to the virtual collision mesh outline of the component model and the position of the component model;

Assembly parameters include interference detection results for component models.

The beneficial effects of the present invention are:

The invention effectively supports the simulation of the assembly process, and has the characteristics of simple operation, good model adaptability and high simulation efficiency.

Virtual assembly can optimize the performance of assembly systems, improve assembly efficiency, and meet enterprise and market requirements. Through computer simulation technology, on the basis of the principle of easy assembly, the assemblability of products is considered and simulated in advance, which can effectively simplify the production process, reduce production costs, improve production efficiency, and also provide a visualization method for the assembly process.

Description of drawings

Fig. 1 is the module structure schematic diagram of a kind of virtual assembly simulation system of the present invention;

Fig. 2 is the module structure schematic diagram of the interference table generation module in Fig. 1;

FIG. 3 is a flowchart of a method for generating an assembly sequence in the virtual assembly simulation method of the present invention.

4 is a flowchart of a method for generating a component interference table in the virtual assembly simulation method of the present invention.

Detailed ways

A virtual assembly simulation system of this embodiment is mainly used for virtual assembly simulation of an aircraft.

As shown in Figures 1 to 2, it includes a model processing module 1, a virtual assembly visualization operation module 3 (also includes an assembly process visualization module 3-1, an operation module 3-2 and a prompt information module 3-3), assembly parameter calculation Module 4 and Assembly Process Planning Module 2;

The model processing module 1 is used to import the part model of the designed aircraft, record the assembly information of the part model, and adjust the scale of the model for the imported aircraft part model; it can also generate a mesh outline that fits the model boundary as the model. Colliders for interference detection and installation space calculations.

The model processing module 1 is also used to record the assembly information of the component model; the assembly information includes the quality characteristics of the component model and the assembly hierarchy relationship.

The assembly process planning module 2 includes an interference table generation module 2-1, a disassembly sequence generation module 2-2, a process planning cycle module 2-3 and an assembly sequence generation module 2-4, and the interference table generation module 2-1 includes parts and components Model moving module 2-1-1, interference marking module 2-1-2, dismantling direction switching cycle module 2-1-3, component switching cycle module 2-1-4.

Assembly process planning module 2 is used for user-defined or system-generated assembly sequence, recording the assembly sequence performed in the virtual environment, optimizing the assembly process and verifying the optimized assembly sequence, and simulates the user after the assembly simulation is completed. Process and results are recommended.

The assembly process planning module 2 can also record the parts installed and disassembled by the user during the assembly process, and can be viewed after the assembly is completed (triggered by the complete assembly button); it can automatically analyze the recorded assembly process, and After optimization of the assembly process, relevant suggestions will be given in the assembly suggestion column, explaining the optimization content.

The virtual assembly visualization operation module 3 includes an assembly process visualization module 3-1 (represented as an assembly process visualization window), an operation module 3-2 and a prompt information module 3-3 (represented together as an operation and prompt information window), and in the virtual assembly simulation In the assembly scene of the system, the component model of the assembled product is assembled or disassembled, and the virtual tooling such as the robotic arm is controlled, and the relevant information of the entire operation process and the component model is displayed in real time through the assembly process visualization window.

The information of the component model includes the name of the component model, quality characteristics and assembly priority;

The above-mentioned assembly process visualization window can realize the visualization of the assembly environment, each component model and the virtual tooling, and can adjust the assembly scene, such as the setting of lighting and venue, the adjustment of the window field of view and the viewing angle, etc.; the virtual tooling can also be replaced by A pervasive virtual human hand.

The above operation and information prompt window contains operation buttons and prompt information. The operation buttons include the selection buttons of components and tooling (used to select component models and virtual tooling), and the control buttons of components and tooling (use It is used for the control of the component model and the control of the virtual tooling), the assembly button (used to assemble the corresponding component model through the virtual tooling or virtual human hand or directly control the component model to assemble), the disassembly button (used to assemble the component model through the virtual The tooling or virtual human hand disassembles the corresponding component model or directly controls the component model to disassemble), the complete assembly button (used to click after the assembly is completed, and jump to the preset module), the module jump button (use to jump to the selected module during or after assembly), etc.

The prompt information includes the current component model, the interference situation of the component model, the distance between the component model and the installation position, and the status of the component model.

In addition, the prompt information module 2-3 is connected to the assembly parameter calculation module 3, and is used to obtain the size of the installation space of the corresponding component model, the prompt information of the installation space, the interference situation and the distance between the component model and the installation position, and prompt;

The installation space prompt information includes information that the component model cannot be installed through the corresponding virtual tooling and information that the component model can be installed through the corresponding virtual tooling.

The assembly parameter calculation module 4 mainly completes the calculation of some key parameters in the assembly process, such as the size of the installation space, the quality characteristics of the assembly, the interference detection of the component model, etc., and stores the data variables defined in the virtual simulation assembly system.

The assembly parameter calculation module 4 calculates the collision situation and distance between the assembly component model and the assembly (incomplete assembly, assembly assembly of multiple component models) in real time. The information module 3-3) generates prompt information.

The assembly parameters calculated by the assembly parameter calculation module 4 also include assembly quality characteristics; and the assembly quality characteristics are obtained from the quality characteristics of the component models included in the corresponding assembly.

The quality characteristics of the component model are input by the designer or generated by related software when the component model is established or before the virtual assembly.

Moreover, the assembly parameter calculation module 3 further includes a space comparison module 3-1;

The space comparison module 3-1 is used to compare the size of the installation space of the component model with the minimum tool installation space threshold of the corresponding virtual tool; if the size of the installation space is smaller than the minimum tool installation space threshold, the component model cannot pass The corresponding virtual tooling is installed; otherwise, the component model can be installed through the corresponding virtual tooling. Among them, the size of the installation space is obtained through the following steps:

According to the virtual collision mesh outline of the component model, the depth of the installation space and the cross-sectional area of the installation space are calculated; the cross-section is parallel to the plane perpendicular to the depth of the installation space;

The size of the installation space is obtained by calculating the depth of penetration and the cross-sectional area.

The system also includes an assembly training module, which is used to introduce the interface structure of the virtual assembly simulation system and the functions of various other modules, and to train new users on the relevant operations of the assembly process.

The assembly parameter calculation module 4 can also compare the size of the installation space with the virtual tool or the virtual human hand to determine whether the installation can be performed.

Specific embodiment 2, a virtual assembly simulation method of this embodiment, that is, the specific working steps of the virtual assembly simulation system are as follows:

Step 1. Enter the assembly training module 5 on the main interface, understand each component module of the virtual assembly simulation system through the structure diagram and description, and understand the interface logic relationship of the virtual assembly simulation system through the flowchart;

Step 2. Enter the model processing module 1, import the model of the designed product, set its zoom ratio, record the model information of each component, input its related parameters, such as mass characteristics, etc., and then generate a collision boundary for it, initialize the component model and the location of the tooling;

Step 3. Enter the assembly process planning module 2, open the complete assembly model, and generate the assembly sequence by the system;

Step 4. Enter the virtual assembly visualization operation module 3, and assemble according to the assembly sequence. Users can observe the corresponding effects while performing assembly and scene adjustment operations in the assembly visualization window. The main operating devices are the mouse and specific keys on the keyboard. Finally, click assembly or disassembly to complete the corresponding action. If there is interference or insufficient installation space during the operation, the action will not be completed, and you can try again. In the operation and information prompt window, check the information of various interference and collision situations and installation space during the assembly process;

Step 5. Enter the assembly parameter calculation module 4, and check the parameters of the assembly such as quality characteristics;

Step 6. Enter the assembly process planning module again, check the previous assembly and disassembly records, the module automatically analyzes and optimizes the assembly process, and gives optimization suggestions;

Step 7. Complete the assembly and return to the main interface of the system.

The assembly process planning module 2 generates an assembly sequence by automatically disassembling the assembly.

As shown in Figure 3, in order to generate the assembly sequence process, the method to generate the assembly sequence is based on the idea of disassembly and assembly. The complete assembly is disassembled without interference and then the disassembly sequence is recorded, and then the assembly sequence is obtained in reverse. The steps to generate an assembly sequence are as follows:

1) First extract the feature information and pose information of the current undisassembled parts (obtained through the component model imported by the model processing module 1, and the component model acquisition itself carries the feature information and pose information when it is established), according to the assembly hierarchy relationship From the outside to the inside, the parts are automatically disassembled along multiple geometric directions, and the interference check is performed during the disassembly process, and a part interference table is established. The feature information includes the name, type and ID number of the part model, and the pose information includes the part. The position and attitude information of the model;

2) Compare each disassembly direction according to the parts interference table to obtain the direction with the least interference, remove the parts that can be disassembled in this direction, rename these parts, and record the disassembly direction and the ID of the corresponding part;

3) Repeat steps 1 and 2 for multiple rounds of disassembly until all parts are disassembled;

4) Reverse the disassembly sequence to obtain the assembly sequence generated by the system;

Table 1 is the parts interference table obtained in one round of disassembly. The parts interference table records the interference of all the parts to be disassembled in different disassembly directions in one round of disassembly. If part A interferes in the disassembly direction 1, it is recorded as 1, otherwise it is 0.

Table 1

Disassembly direction 1 Disassembly direction 2 Disassembly direction 3 Disassembly direction 4 Disassembly direction 5 Disassembly direction 6 Part 1 1 1 1 1 1 1 Part 2 1 0 1 1 1 1 Part 3 1 1 0 0 1 1 Part 4 1 1 1 0 1 1 Part 5 1 0 1 1 0 1 Part 6 1 1 1 1 1 0

As shown in Figure 4, a flow chart is generated for the part interference table, and the process of obtaining the part interference table is:

1) First determine the feature size (such as length) of an undisassembled part, then gradually move the part along a disassembly direction to an equal distance of the feature size, and perform interference detection. If interference occurs, the corresponding position of the interference table is 1. , otherwise it is 0, and then the same operation is performed for the part along other disassembly directions until all disassembly directions are completed, and the detection of a single part is completed;

2) Repeat the process of 1 for the next part until all the undisassembled parts are inspected, and finally get the part interference table.

Claims (6)

1. A virtual assembly simulation method is characterized by comprising the following specific steps:

s1, importing an assembly body model;

s2, generating a first assembly sequence according to the complete assembly model;

the first assembly sequence is an assembly sequence which does not consider the virtual tool to participate in assembly;

s3, performing visual operation on the part model by using the virtual tool and using the reference assembly sequence, and generating a second assembly sequence;

the visualization operation includes: selecting and controlling a corresponding virtual tool, and assembling or disassembling the corresponding part model through the corresponding virtual tool; selecting and controlling a corresponding part model to be directly assembled or disassembled;

the reference assembly sequence initially employs the first assembly sequence; the second assembly sequence is an assembly sequence considering the virtual tool to participate in assembly;

s4, optimizing and updating the second assembly sequence by using an assembly process optimization algorithm, replacing the original reference assembly sequence with the updated second assembly sequence, and returning to the step S3;

or finishing the assembly and finishing the virtual assembly simulation;

the specific method for generating the first assembly sequence in step S2 is as follows:

s21, disassembling each part model along a plurality of set disassembling directions according to the sequence of the assembling layers of the current assembling body model from outside to inside; acquiring an interference detection result in the disassembly process, and establishing a part interference table;

s22, comparing each disassembly direction in the part interference meter to obtain the disassembly direction with the least interference, recording the disassembly direction and the detachable part model in the disassembly direction, and adding a disassembly sequence;

the detachable part model is a part model without interference in the detaching direction;

s23, removing the detachable part model in the step S22, updating the assembly body model, and returning to the step S21;

until all the part models become detachable part models, obtaining a final detaching sequence, and entering step S24;

s24, carrying out reverse order on the final disassembly sequence to obtain a first assembly sequence;

the specific method of step S21 is as follows:

s211, obtaining the characteristic size of a part model, enabling the part model to move along a set disassembly direction and obtaining an interference detection result, wherein the moving distance is equal to the characteristic size;

s212, according to the interference condition of the part model, corresponding interference marks are arranged in a part interference table;

if the part model interferes in the disassembly direction, filling an interference mark in a corresponding position in a part interference table; otherwise, filling the non-interference mark;

s213, replacing the disassembly direction, and returning to execute the step S211; until the interference situation of the part model in all disassembly directions is filled into the part interference table, executing step S214;

s214, replacing the part model, and returning to execute the step S211; and filling the part interference table until the interference conditions of all the part models in all the disassembly directions are filled, and finishing the establishment of the part interference table.

2. The virtual assembly simulation method of claim 1, wherein the step S1 further comprises:

s11, generating a virtual collision grid outline of the part model to obtain the position of the part model and the position of the virtual tool;

and S12, displaying the part model and the virtual tool.

3. The virtual assembly simulation method according to claim 2, wherein the interference detection result in step S211 is obtained by:

calculating according to the virtual collision grid outline of the part model and the position of the part model to obtain assembly parameters in the visual operation process;

the assembly parameters comprise interference detection results of the part models.

4. A virtual assembly simulation system is characterized by comprising a model processing module (1), an assembly process planning module (2) and a virtual assembly visual operation module (3);

the model processing module (1) is used for importing an assembly body model;

the assembly process planning module (2) is connected with the model processing module (1) and is used for generating a first assembly sequence according to the complete assembly body model;

the first assembly sequence is an assembly sequence which does not consider the virtual tool to participate in assembly;

the virtual assembly visual operation module (3) is simultaneously connected with the model processing module (1) and the assembly process planning module (2) and is used for performing visual operation on the part model by using the virtual tool and a reference assembly sequence and generating a second assembly sequence;

the visualization operation includes: selecting and controlling a corresponding virtual tool, and assembling or disassembling the corresponding part model through the corresponding virtual tool; selecting and controlling a corresponding part model to be directly assembled or disassembled;

the reference assembly sequence initially employs the first assembly sequence; the second assembly sequence is an assembly sequence considering the virtual tool to participate in assembly;

the assembly process planning module (2) is further configured to optimize and update the second assembly sequence by using an assembly process optimization algorithm, replace the original reference assembly sequence with the updated second assembly sequence, and send the new reference assembly sequence to the virtual assembly visualization operation module (3);

the assembly process planning module (2) comprises an interference table generation module (2-1), a disassembly sequence generation module (2-2), a process planning circulation module (2-3) and an assembly sequence generation module (2-4);

the interference table generation module (2-1) is used for disassembling each part model along a plurality of set disassembly directions according to the sequence of the assembly layers of the current assembly body model from outside to inside; acquiring an interference detection result in the disassembly process, and establishing a part interference table;

the disassembly sequence generation module (2-2) is connected with the interference meter generation module (2-1) and used for comparing all disassembly directions in the part interference meter to obtain a disassembly direction with minimum interference, recording the disassembly direction and a detachable part model in the disassembly direction, and adding a disassembly sequence;

the detachable part model is a part model without interference in the detaching direction;

the process planning cycle module (2-3) is simultaneously connected with the interference table generation module (2-1) and the disassembly sequence generation module (2-2) and is used for receiving the disassembly sequence, eliminating detachable part models in the disassembly sequence, updating an assembly body model and sending the assembly body model to the interference table generation module (2-1);

until all the part models become detachable part models, obtaining a final detaching sequence;

the assembly sequence generation module (2-4) is connected with the process planning circulation module (2-3) and used for receiving the final disassembly sequence and carrying out reverse sequence on the final disassembly sequence to obtain a first assembly sequence;

the interference table generation module (2-1) comprises a part model moving module (2-1-1), an interference marking module (2-1-2), a disassembly direction switching circulation module (2-1-3) and a part switching circulation module (2-1-4);

the part model moving module (2-1-1) is used for obtaining the characteristic dimension of a part model, enabling the part model to move along a set disassembly direction and obtaining an interference detection result, and the moving distance is equal to the characteristic dimension;

the interference mark module (2-1-2) is connected with the part model moving module (2-1-1) and used for generating a disassembly direction switching signal after the interference marks in the disassembly direction are filled according to the interference condition of the part model and corresponding interference marks in the part interference table;

if the part model interferes in the disassembly direction, filling an interference mark in a corresponding position in a part interference table; otherwise, filling the non-interference mark;

the disassembly direction switching circulation module (2-1-3) is simultaneously connected with the part model moving module (2-1-1) and the interference mark module (2-1-2) and is used for receiving a disassembly direction switching signal, replacing the disassembly direction and sending the disassembly direction switching signal to the part model moving module (2-1-1);

until the interference condition of the part model in all disassembly directions is filled into a part interference meter, generating a part switching signal and sending the part switching signal to a part switching circulating module (2-1-4);

the part switching circulating module (2-1-4) is simultaneously connected with the disassembling direction switching circulating module (2-1-3) and the part model moving module (2-1-1) and is used for receiving a part switching signal, replacing a part model and sending the part model to the part model moving module (2-1-1);

and filling the part interference table until the interference conditions of all the part models in all the disassembly directions are filled, and finishing the establishment of the part interference table.

5. The virtual fit simulation system of claim 4,

the model processing module (1) is further used for generating a virtual collision grid outline of the part model to obtain the position of the part model and the position of the virtual tool;

the virtual assembly visual operation module (3) is also used for displaying the part model and the virtual tool.

6. The virtual fit simulation system of claim 5, further comprising an assembly parameter calculation module (4);

the assembly body parameter calculation module (4) is connected with the interference table generation module (2-1) and is used for calculating and obtaining assembly parameters in the visual operation process according to the virtual collision grid outline of the part model and the position of the part model;

the assembly parameters comprise interference detection results of the part models.

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