CN106446475A - Method and device for extracting welding point information of vehicle body in white - Google Patents

Abstract

The invention discloses a method and a device for extracting the welding point information of a vehicle body in white. The method in one embodiment comprises the following steps of extracting the welding point information of each welding point in a vehicle three-dimensional digital model, wherein the welding point information comprises welding point serial numbers and spherical surface characteristic bodies using the welding points as centers; according to the spherical surface characteristic body of each welding point, carrying out spherical surface interference treatment on each welding point and each part in the vehicle three-dimensional digital model so as to obtain the part numbers of initial parts possibly connected through the welding points; according to the welding point serial number of each welding point, the part numbers of the initial parts corresponding to each welding point and a structure tree hierarchical relationship in the vehicle three-dimensional digital model, screening out actually connected parts of each welding point from the initial parts corresponding to each welding point respectively; and guiding out the part information of the actually connected parts of each welding point from the vehicle three-dimensional digital model, wherein the part information comprises part names, part materials and part plate thicknesses. In the embodiment of the invention, the method is high in scheme pertinence and high in accuracy, control and change management of the welding point information can be convenient to carry out effectively, and seamless connection between design information and manufacturing information is realized.

Description

Method and device for extracting welding spot information of vehicle body-in-white

technical field

The invention relates to the field of vehicle technology, in particular to a method for extracting information on welding points of a vehicle body-in-white and a device for extracting information on welding points of a vehicle body-in-white.

Background technique

With the increasing popularity of vehicles, the competition in the automotive industry has become increasingly fierce, and the overall development cycle of products from design to trial production and mass production has become shorter and shorter. How to efficiently and accurately realize the seamless connection from product to production has become important work content. At present, the main connection method of automobile body-in-white is still spot welding. The management of welding point information (including number, name of connected parts, material, plate thickness, etc.) in welding workshop is the process planning, welding parameter debugging management and on-site process document preparation Foundation. In the actual product design to production process, the solder joint information is input to the production department as part of the 3D digital model; as there are as many as 4,000 to 5,000 solder joints in the body-in-white, the manual extraction of solder joint information is cumbersome, time-consuming, and easy Errors and omissions occurred, and it was difficult to carry out effective control and change management in the follow-up process, laying hidden dangers for on-site process control and welding quality.

Contents of the invention

Based on this, the purpose of the embodiments of the present invention is to provide a method for extracting information on solder joints of a vehicle body-in-white and a device for extracting information on solder joints of a vehicle body-in-white. control and change management, and realize the seamless connection of design and manufacturing information.

In order to achieve the above purpose, the embodiment of the present invention adopts the following technical solutions:

A method for extracting welding spot information of a vehicle body-in-white, comprising the steps of:

Extracting the welding point information of each welding point in the vehicle 3D digital model, the welding point information includes the welding point number and the spherical feature body centered on the welding point;

According to the spherical feature body of each of the solder joints, perform spherical interference processing on each of the solder joints and each part in the 3D digital model of the vehicle, to obtain the part numbers of the initial parts that may be connected to each of the solder joints;

According to the welding spot number of each said welding spot, the part number of the original part corresponding to each said welding spot, and the hierarchical relationship of the structural tree in the vehicle 3D digital model, respectively select from the said initial parts corresponding to each welding spot Show the actual connecting parts of each said solder joint;

The part information of the actually connected parts of each of the welding spots is derived from the 3D digital model of the vehicle, and the part information includes part name, part material, and part plate thickness.

A vehicle body-in-white welding spot information extraction device, comprising:

The welding spot information extraction module is used to extract the welding spot information of each welding spot in the vehicle 3D digital model, and the welding spot information includes a welding spot number and a spherical feature body centered on the welding spot;

The spherical interference module is used to perform spherical interference processing on each of the welding points and each part in the 3D digital model of the vehicle according to the spherical feature body of each of the welding points, and obtain each initial state of the possible connection of each of the welding points. the part number of the part;

The part screening module is used to select from the corresponding welding points according to the welding point numbers of each of the welding points, the part number of the initial part corresponding to each of the welding points, and the hierarchical relationship of the structure tree in the 3D digital model of the vehicle. The actual connecting parts of each of the solder joints are screened out from the initial parts;

The part information acquisition module is used to derive the part information of the actually connected parts of each of the welding spots from the vehicle 3D digital model, and the part information includes part name, part material, and part plate thickness.

According to the solution of the embodiment of the present invention as described above, information such as the name of the part, the material of the part, and the thickness of the part are added to the 3D digital model of the vehicle, and by extracting each solder joint in the 3D digital model of the vehicle, and based on each The spherical feature body of the solder joint is subjected to the spherical interference processing of the solder joint, and the initial parts that may be connected to each solder joint can be obtained, and these initial parts can be screened by combining the structural tree hierarchical relationship in the 3D digital model of the vehicle, so that each The information of the parts actually connected by the solder joints, and then derive the information of these actually connected parts from the 3D digital model of the vehicle, so that the relationship between the parts actually connected by each solder joint can be obtained in a targeted manner, which is highly targeted and accurate. And it can facilitate and effectively control and change management of solder joint information, and realize the seamless connection of design and manufacturing information.

Description of drawings

Fig. 1 is a schematic flow chart of a method for extracting welding spot information of a vehicle body-in-white in one embodiment;

Fig. 2 is a schematic flow chart of a method for extracting information on welding spots of a vehicle body-in-white in another embodiment;

Fig. 3 is a schematic flow chart of a method for extracting information on welding spots of a vehicle body-in-white in another embodiment;

Fig. 4 is a schematic flow chart of a method for extracting information on welding spots of a vehicle body-in-white in a specific example;

Fig. 5 is a schematic diagram of the structural tree hierarchical relationship of the vehicle 3D digital model in a specific application example;

Fig. 6 is a schematic structural diagram of a vehicle body-in-white welding spot information extraction device in an embodiment.

detailed description

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, and do not limit the protection scope of the present invention.

During the simultaneous development of vehicle products, due to continuous updating of data technology and performance optimization, the 3D digital model of the vehicle generally only reflects the digital model and structure tree, and the parts and plate information are stored in the form of BOM (Bill of Material, Bill of Materials). Therefore, in the process of process planning and welding parameter debugging, it is necessary to extract the information of parts and plates connected by 4000-5000 solder joints under different welding levels.

For the 4000-5000 solder joints of the body-in-white, it is impossible to effectively extract and batch output the information of parts and plates connected by each solder joint under different welding levels, the workload is heavy and the accuracy is difficult to guarantee; after frequent data update and optimization , There are also great hidden dangers in the effective management of solder joint information. According to the structural relationship and part information in the 3D digital model of the vehicle, the embodiments of the present invention use solder joints as nodes to realize information integration and extraction, and perform effective management to realize seamless connection of design and manufacturing information.

FIG. 1 shows a schematic flowchart of a method for extracting information on welding spots of a vehicle body-in-white in an embodiment. As shown in Figure 1, the method in this embodiment comprises steps:

Step S101: extract the welding spot information of each welding spot in the vehicle 3D digital model, the welding spot information includes the welding spot number and the spherical feature body centered on the welding spot;

Step S102: According to the spherical feature body of each of the solder joints, perform spherical interference processing on each of the solder joints and each part in the 3D digital model of the vehicle, and obtain the parts of each initial part that each of the solder joints may be connected to No;

Step S103: According to the welding spot number of each welding spot, the part number of the initial part corresponding to each of the welding spots, and the hierarchical relationship of the structure tree in the vehicle 3D digital model, respectively from the initial part corresponding to each welding spot The actual connected parts of each of the solder joints are screened out from the parts;

Step S104: From the 3D digital model of the vehicle, the part information of the actually connected parts of each of the welding spots is derived, and the part information includes part name, part material, and part plate thickness.

According to the solution of the embodiment of the present invention as described above, information such as the name of the part, the material of the part, and the thickness of the part are added to the 3D digital model of the vehicle, and by extracting each solder joint in the 3D digital model of the vehicle, and based on each The spherical feature body of the solder joint is subjected to the spherical interference processing of the solder joint, and the initial parts that may be connected to each solder joint can be obtained, and these initial parts can be screened by combining the structural tree hierarchical relationship in the 3D digital model of the vehicle, so that each The information of the parts actually connected by the solder joints, and then derive the information of these actually connected parts from the 3D digital model of the vehicle, so that the relationship between the parts actually connected by each solder joint can be obtained in a targeted manner, which is highly targeted and accurate. And it can facilitate and effectively control and change management of solder joint information, and realize the seamless connection of design and manufacturing information.

In the embodiment shown in FIG. 1 , the attribute of the part of the 3D digital model of the vehicle already includes part information such as the part name, part material and plate thickness as an example. In practical technical applications, as mentioned above, when modeling a 3D digital model of a vehicle, generally no part information such as part name, part material, and plate thickness will be included. Therefore, before performing the method in the above-mentioned embodiment, the The part information in the BOM can be written into the properties of the parts in the vehicle 3D digital model.

Accordingly, Fig. 2 shows a schematic flow chart of a method for extracting information on welding spots of vehicle body-in-white in another embodiment, as shown in Fig. 2 , in this embodiment, on the basis of the above-mentioned embodiment shown in Fig. 1 Above, before extracting the information of each welding spot in the 3D digital model of the vehicle in the above step S101, further steps are included:

Step S1001: Obtain the part number and corresponding part information of each part in the material list, the part information includes part name, part material and plate thickness;

Step S1002: Write the part information of each part into the attribute of the part corresponding to the part number in the vehicle 3D digital model according to the part number of each part.

Therefore, based on the above method, the part information in the BOM (Bill of Materials) can be written into the attribute of the part corresponding to the part number in the vehicle 3D digital model based on the part number of the part. After the actual connected parts of each solder joint are obtained in the subsequent step S104, the relevant welding performance of the solder joint can be determined based on the part information of the actual connected parts of each solder joint, and welding or optimization can be performed accordingly.

As shown in Figure 2, in the example shown in Figure 2, before the above step S101, the steps may also include:

Step S1003: Numbering each welding point to obtain the welding point number of each welding point, the welding point number includes the part number of the welding point in the vehicle 3D digital model;

Step S1004: For a solder joint that does not have a corresponding spherical feature body, create a spherical feature body of the solder joint.

Therefore, for any solder joint, it can be ensured that the solder joint has a corresponding spherical feature, which facilitates subsequent spherical interference processing for the solder joint. The specific implementation manner of creating the spherical feature body of the solder joint based on the solder joint may be implemented in any possible manner, which will not be described in detail here.

Wherein, the welding spot is numbered in the above step S1003, and when the welding spot number of the welding spot is obtained, the welding spot number includes the part number of the welding spot in the vehicle 3D digital model. Therefore, in the above-mentioned step S103, through the structural tree hierarchical relationship in the vehicle 3D digital model, the welding spot number of each welding spot can be compared with the part number of each initial part corresponding to the welding spot in the structural tree hierarchical relationship. In the hierarchy at , among the initial parts, the initial part at the same level as the welding spot is determined as the actual connecting part of the welding spot.

FIG. 3 shows a schematic flowchart of a method for extracting information on welding spots of a vehicle body-in-white in another embodiment. As shown in Figure 3, on the basis of the embodiment shown in Figure 1 above, this embodiment may further include steps after the above step S104:

Step S105: According to the derived part information of each actual connected part of each solder joint, determine the number of connected parts, the total welding thickness and the material thickness ratio of each solder joint;

Step S106: When the number of connected parts of the solder joint is greater than the threshold of the number of parts, the total welding thickness of the solder joint is greater than the welding thickness threshold, or the material thickness ratio of the solder joint is greater than the material thickness ratio threshold, a prompt message is given.

Therefore, after obtaining the actual connected parts of each solder joint, based on the information of these actual connected parts, the number of connected parts, the total welding thickness and the material thickness ratio of the solder joint are determined, so as to determine the welding performance of the solder joint, and for The solder joints whose welding performance exceeds the constraint range will be prompted. Wherein, when the prompt information is given above, any possible manner may be used for prompting. In a specific example, it may be for solder joints that exceed the constraint range (that is, the number of connected parts is greater than the threshold of the number of parts, the total welding thickness of the solder joint is greater than the welding thickness threshold, or the material thickness ratio of the solder joint is greater than the material thickness ratio threshold) Prompt, this prompt can be any possible way such as sound prompt, highlight prompt, strobe prompt.

Based on the methods in the various embodiments described above, FIG. 4 shows a schematic flowchart of a method for extracting welding spot information of a vehicle body-in-white in a specific application example.

As shown in Figure 4, when starting to execute the method for extracting the welding spot information of the vehicle body-in-white, it is first determined whether the parts in the 3D digital model of the vehicle contain the required attributes. The attribute information of the parts can also be judged by the staff. If the vehicle 3D digital model does not contain the required attributes (such as the above-mentioned part name, part material, plate thickness, etc.), by reading the BOM and corresponding to the part number, the parts of the parts included in the BOM Information (including part name, material, plate thickness, etc.) is written into the attributes of the parts in the vehicle 3D digital model.

If the vehicle 3D digital model contains the attributes of the required parts, further analyze whether the solder joints in the vehicle 3D digital model have solder joint numbers and have corresponding spherical feature bodies. If not, number the solder joints. The solder joint number can contain the information of the corresponding solder joint part number to distinguish the solder joints under different welding levels and realize the effective management of the solder joints of the whole vehicle. For example, a specific application example The name in can be "welding point part number (digital model number)_number", and the spherical feature point of the welding point will be generated. Based on the design method of the 3D digital model of the vehicle, all solder joints use points as information features. Therefore, the characteristic points of the solder joints in the 3D digital model of the vehicle are used as the center of the solder joints to generate a spherical surface with a predetermined diameter and length (for example, 6 mm). (In this embodiment, it is called a spherical feature body).

When each solder joint in the vehicle 3D digital model has a corresponding spherical feature body and a number of the corresponding spherical feature body, for any solder joint, the spherical interference processing of the solder joint is performed to obtain the entity that the solder joint may be connected to Parts (i.e. the original parts mentioned in the above-mentioned embodiments). Then, for the part numbers of each initial part obtained, through the structural tree hierarchical relationship in the vehicle 3D digital model, compare the welding spot number of each welding spot with the part number of each initial part corresponding to the welding spot in the structural tree hierarchical relationship The level in which the welding point is located, the parts under the welding level of the welding point are reserved (that is, the initial parts under the same level as the welding point in each of the initial parts are determined as the actual connection parts of the welding point), and the parts not in the welding point are excluded. The part under the welding level of the point, so that the remaining part is determined as the actual connected part of the welding point. Because based on the structure tree in the vehicle 3D digital model, based on the part numbers of each part and welding point and the hierarchical relationship of the structure tree in the vehicle 3D digital model, it can be determined whether the part number of each part is under the welding level of the welding point, so , the specific way of determining whether the part number of the part is under the welding level of the solder joint will not be described in detail here.

Fig. 5 shows a schematic diagram of the hierarchical relationship of the structural tree of the vehicle 3D digital model in a specific application example. As shown in FIG. 5 , 4210001, 4210002, 4210003, and 4210004 are part numbers of solder joints (ie, solder joint numbers), and others are part numbers of parts or combinations.

As shown in Figure 5, by performing spherical interference processing on the solder ball 4210002_1 in the solder joint 4210002, four initial parts 4010003, 4010009, 4010006 and 4010008 can be obtained. By comparing whether each initial part and the welding spot 4210002 are under the same welding level (that is, the gray box area shown in Figure 5), it is obtained that only the initial parts 4010003, 4010009 and the welding point 4210002 are under the same welding level, thus The initial parts 4010003, 4010009 are determined as the actual connected parts of the welding spot 4210002.

Similarly, four initial parts 4010003, 4010009, 4010006 and 4010008 can be obtained by performing spherical interference processing on the solder ball 4210001_1 in the solder joint 4210001. By comparing whether each initial part and the welding spot 4210001 are in the same welding level, it can be obtained which of these initial parts is the actual connecting part of the welding spot 4210001.

After the actual connection parts are determined, the parts information of the actual connection parts of the welding points can be derived from the vehicle 3D digital model according to the welding point numbers and coordinates of each welding point for integration and operation management. And based on the part information of each actual connected part everywhere, determine the welding parameters such as the number of connected parts of the solder joint, the total welding thickness, and the material thickness ratio. Among them, the number of connected parts refers to the number of actually connected parts of the solder joint, the total welding thickness refers to the sum of the plate thickness of the actually connected parts of the solder joint, and the material thickness ratio refers to the maximum value of the plate thickness of the actually connected parts of the solder joint The specific method of calculating the welding parameters, such as the ratio to the minimum value, etc., can be performed in any possible way, which will not be described in detail here.

After the welding parameters of each welding point are obtained, the welding points whose welding parameters exceed the constraint range can be prompted. For example, when the number of connected parts of a certain solder joint is greater than the threshold value of the number of parts, the total welding thickness of the solder joint is greater than the welding thickness threshold, or the material thickness ratio of the solder joint is greater than the material thickness ratio threshold, it is given that the solder joint exceeds the constraint range Prompt information. The specific prompting method can be carried out in any possible way. In one specific application example, the value beyond the constraint range can be highlighted. For example, when the material thickness ratio of the solder joint is greater than the material thickness ratio threshold, The material thickness ratio of the solder joint is highlighted, and when the total weld thickness of the solder joint is greater than the weld thickness threshold, the total weld thickness of the solder joint is highlighted. Among them, the specific parts quantity threshold, welding thickness threshold, material thickness ratio threshold, etc. can be individually specified according to different enterprise standards.

As mentioned above, in the embodiment scheme of the present invention, for any solder joint, the parts connected by the solder joint must satisfy two logics at the same time: produce spherical interference with the spherical feature body of the solder joint; under the hierarchy node. The solder joint numbers of the solder joints can be numbered based on the spherical feature body of the solder joints and the solder joints, combined with the structure tree of the 3D digital model of the vehicle, so that the actual connection parts of each solder joint can be effectively determined, and then based on the actual connection parts of each Part information, determine the welding parameters of each welding spot.

Therefore, based on the method in the above-mentioned embodiment, on the one hand, the accuracy and effectiveness of solder joint information management can be guaranteed, and on-site process management information can be realized; on the other hand, the consistency of solder joint design and manufacturing can also be ensured. On the other hand, it can also realize the convenience of on-site process information extraction, and improve the efficiency of solder joint information management, welding parameter debugging and management, and joint process documentation. Through actual experiments, it is found that, based on the solutions in the above-mentioned embodiments, the efficiency of solder joint information management, welding parameter debugging and management, and process documentation is increased by more than 30%.

Based on the same idea as the above method, an embodiment of the present invention also provides a vehicle body-in-white welding point information extraction device, and FIG. 6 shows a schematic structural diagram of a vehicle body-in-white welding point information extraction device in an embodiment.

As shown in Figure 6, the vehicle body-in-white welding spot information extraction device in this embodiment includes:

The welding spot information extraction module 601 is used to extract the welding spot information of each welding spot in the vehicle 3D digital model, and the welding spot information includes the welding spot number and the spherical feature body centered on the welding spot;

The spherical interference module 602 is configured to perform spherical interference processing on each of the welding points and each part in the 3D digital model of the vehicle according to the spherical feature of each of the welding points, and obtain each possible connection of each of the welding points. the part number of the original part;

The parts screening module 603 is used to select from each welding point corresponding The actual connection parts of each of the solder joints are screened out from the initial parts;

The part information acquisition module 604 is configured to derive part information of the actually connected parts of each welding spot from the vehicle 3D digital model, and the part information includes part name, part material, and part plate thickness.

According to the solution of the embodiment of the present invention as described above, information such as the name of the part, the material of the part, and the thickness of the part are added to the 3D digital model of the vehicle, and by extracting each solder joint in the 3D digital model of the vehicle, and based on each The spherical feature body of the solder joint is subjected to the spherical interference processing of the solder joint, and the initial parts that may be connected to each solder joint can be obtained, and these initial parts can be screened by combining the structural tree hierarchical relationship in the 3D digital model of the vehicle, so that each The information of the parts actually connected by the solder joints, and then derive the information of these actually connected parts from the 3D digital model of the vehicle, so that the relationship between the parts actually connected by each solder joint can be obtained in a targeted manner, which is highly targeted and accurate. And it can facilitate and effectively control and change management of solder joint information, and realize the seamless connection of design and manufacturing information.

In the above-mentioned embodiment, the attribute of the part of the 3D digital model of the vehicle already contains the part information such as the part name, part material and plate thickness as an example. In practical technical applications, as mentioned above, when modeling a 3D digital model of a vehicle, generally no part information such as part name, part material, and plate thickness will be included. Therefore, before performing the method in the above-mentioned embodiment, the The part information in the BOM can be written into the properties of the parts in the vehicle 3D digital model.

Accordingly, in a specific example, on the basis of the above-mentioned embodiments, the apparatus for extracting welding spot information of a vehicle body-in-white in this embodiment may further include:

The part information import module 6001 is used to obtain the part number and corresponding part information of each part in the bill of materials, the part information includes part name, part material and plate thickness; and according to the part number of each part, the part number of each part The information is written into the attribute of the part corresponding to the part number in the 3D digital model of the vehicle.

Therefore, based on the above method, the part information in the BOM (Bill of Materials) can be written into the attribute of the part corresponding to the part number in the vehicle 3D digital model based on the part number of the part. After the actual connected parts of each solder joint are obtained in the subsequent step S104, the relevant welding performance of the solder joint can be determined based on the part information of the actual connected parts of each solder joint, and welding or optimization can be performed accordingly.

In a specific application example, as shown in FIG. 6, the vehicle body-in-white welding spot information extraction device in this embodiment may also include:

The welding spot numbering module 6002 is used to number each welding spot, and obtain the welding spot number of each welding spot, and the welding spot number includes the part number of the welding spot in the vehicle 3D digital model;

The spherical feature body creation module 6003 is configured to create a spherical feature body for a solder joint that has no corresponding spherical feature body.

Therefore, for any solder joint, it can be ensured that the solder joint has a corresponding spherical feature, which facilitates subsequent spherical interference processing for the solder joint. The specific implementation manner of creating the spherical feature body of the solder joint based on the solder joint may be implemented in any possible manner, which will not be described in detail here.

Wherein, the welding spot numbering module 5002 numbers the welding spot, and when obtaining the welding spot number of the welding spot, the welding spot number includes the part number of the welding spot in the vehicle 3D digital model. Therefore, the above-mentioned part screening module 603 can compare the welding spot number of each welding spot with the part number of each initial part corresponding to the welding spot in the structural tree hierarchical relationship in the vehicle 3D digital model. In the hierarchy at , among the initial parts, the initial part at the same level as the welding spot is determined as the actual connecting part of the welding spot.

In a specific application example, as shown in FIG. 6, the vehicle body-in-white welding spot information extraction device in this embodiment may also include:

The solder joint performance determination module 605 is used to determine the number of connected parts, the total welding thickness and the material thickness ratio of each solder joint according to the derived part information of each actual connected part of each solder joint;

The prompt module 606 is used to give prompt information when the number of connected parts of the solder joint is greater than the threshold value of the number of parts, the total welding thickness of the solder joint is greater than the welding thickness threshold, or the material thickness ratio of the solder joint is greater than the material thickness ratio threshold.

Therefore, after obtaining the actual connected parts of each solder joint, based on the information of these actual connected parts, the number of connected parts, the total welding thickness and the material thickness ratio of the solder joint are determined, so as to determine the welding performance of the solder joint, and for The solder joints whose welding performance exceeds the constraint range will be prompted. Wherein, when the prompt information is given above, any possible manner may be used for prompting. In a specific example, it may be for solder joints that exceed the constraint range (that is, the number of connected parts is greater than the threshold of the number of parts, the total welding thickness of the solder joint is greater than the welding thickness threshold, or the material thickness ratio of the solder joint is greater than the material thickness ratio threshold) Prompt, this prompt can be any possible way such as sound prompt, highlight prompt, strobe prompt.

Other technical features of the vehicle body-in-white welding spot information extraction device in this embodiment may be the same as those in the above-mentioned method for extracting vehicle body welding spot information, and will not be repeated here.

The technical features of the above-mentioned embodiments can be combined arbitrarily. To make the description concise, all possible combinations of the technical features in the above-mentioned embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, should be considered as within the scope of this specification.

The above-mentioned embodiments only express several implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but should not be construed as limiting the patent scope of the invention. It should be pointed out that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent for the present invention should be based on the appended claims.

Claims (10)

1. A vehicle body-in-white welding spot information extraction method, is characterized in that, comprises the steps: Extracting the welding point information of each welding point in the vehicle 3D digital model, the welding point information includes the welding point number and the spherical feature body centered on the welding point; According to the spherical feature body of each of the solder joints, perform spherical interference processing on each of the solder joints and each part in the 3D digital model of the vehicle, to obtain the part numbers of the initial parts that may be connected to each of the solder joints; According to the welding spot number of each said welding spot, the part number of the original part corresponding to each said welding spot, and the hierarchical relationship of the structural tree in the vehicle 3D digital model, respectively select from the said initial parts corresponding to each welding spot Show the actual connecting parts of each said solder joint; The part information of the actually connected parts of each of the welding spots is derived from the 3D digital model of the vehicle, and the part information includes part name, part material, and part plate thickness. 2. The vehicle body-in-white welding spot information extraction method according to claim 1, is characterized in that, before extracting the information of each welding spot in the vehicle 3D digital model, also comprises the step: Obtain the part number and corresponding part information of each part in the bill of materials, the part information includes part name, part material and plate thickness; According to the part number of each part, write the part information of each part into the attribute of the part corresponding to the part number in the vehicle 3D digital model. 3. The vehicle body-in-white welding point information extraction method according to claim 1, characterized in that, before extracting the information of each welding point in the 3D digital model of the vehicle, the step also includes: Numbering each welding point to obtain the welding point number of each welding point, the welding point number including the part number of the welding point in the vehicle 3D digital model; For a solder joint that does not have a corresponding spherical feature body, create a spherical feature body for the solder joint. 4. The vehicle body-in-white welding point information extraction method according to claim 1, further comprising the steps of: According to the derived part information of each actual connected part of each solder joint, determine the number of connected parts, total welding thickness and material thickness ratio of each solder joint; When the number of connected parts of the solder joint is greater than the threshold of the number of parts, the total welding thickness of the solder joint is greater than the welding thickness threshold, or the material thickness ratio of the solder joint is greater than the material thickness ratio threshold, a prompt message is given. 5. The vehicle body-in-white welding point information extraction method according to claim 1, wherein the welding point number includes the part number of the welding point in the 3D digital model of the vehicle; According to the welding spot number of each said welding spot, the part number of the original part corresponding to each said welding spot, and the hierarchical relationship of the structural tree in the vehicle 3D digital model, respectively select from the said initial parts corresponding to each welding spot The means of actually connecting parts for each of the described solder joints include: Through the structural tree hierarchical relationship in the 3D digital model of the vehicle, compare the welding spot number of each welding spot with the part number of each initial part corresponding to the welding spot at the level in the structural tree hierarchical relationship, and each of the initial The original part in the part under the same level as the solder joint is determined as the actual connected part of the solder joint. 6. A vehicle body-in-white welding spot information extraction device, characterized in that it comprises: The welding spot information extraction module is used to extract the welding spot information of each welding spot in the vehicle 3D digital model, and the welding spot information includes a welding spot number and a spherical feature body centered on the welding spot; The spherical interference module is used to perform spherical interference processing on each of the welding points and each part in the 3D digital model of the vehicle according to the spherical feature body of each of the welding points, and obtain each initial state of the possible connection of each of the welding points. the part number of the part; The part screening module is used to select from the corresponding welding points according to the welding point numbers of each of the welding points, the part number of the initial part corresponding to each of the welding points, and the hierarchical relationship of the structure tree in the 3D digital model of the vehicle. The actual connecting parts of each of the solder joints are screened out from the initial parts; The part information acquisition module is used to derive the part information of the actually connected parts of each of the welding spots from the vehicle 3D digital model, and the part information includes part name, part material, and part plate thickness. 7. The vehicle body-in-white welding spot information extraction device according to claim 6, further comprising: The part information import module is used to obtain the part number and corresponding part information of each part in the bill of materials. The part information includes part name, part material and plate thickness; and according to the part number of each part, the part information of each part is Write the attribute of the part corresponding to the part number in the 3D digital model of the vehicle. 8. The vehicle body-in-white welding spot information extraction device according to claim 6, further comprising: The welding spot numbering module is used to number each welding spot and obtain the welding spot number of each welding spot, and the welding spot number includes the part number of the welding spot in the 3D digital model of the vehicle; The spherical feature body creation module is used for creating a spherical feature body of the solder joint for a solder joint that does not have a corresponding spherical feature body. 9. The vehicle body-in-white welding spot information extraction device according to claim 6, further comprising: The solder joint performance determination module is used to determine the number of connected parts, the total welding thickness and the material thickness ratio of each solder joint according to the derived part information of each actual connected part of each solder joint; The prompt module is used to give prompt information when the number of connected parts of the solder joint is greater than the threshold of the number of parts, the total welding thickness of the solder joint is greater than the welding thickness threshold, or the material thickness ratio of the solder joint is greater than the material thickness ratio threshold. 10. The vehicle body-in-white welding spot information extraction device according to claim 6, characterized in that: The welding spot number includes the part number of the welding spot in the vehicle 3D digital model; The parts screening module compares the number of welding spots of each welding spot with the level of the part number of each initial part corresponding to the welding spot in the hierarchical relationship of the structural tree through the hierarchical relationship of the structural tree in the 3D digital model of the vehicle, Among the initial parts, the initial part under the same level as the welding spot is determined as the actual connecting part of the welding spot.