Paint process BOM building method based on PLM system

Abstract

A construction method of a paint process BOM based on a PLM system comprises the following steps that firstly, top layer nodes of a product are created in the PLM system, then parts of the product are added under the top layer nodes, then parts of the parts are added under the nodes of the parts, and then needed paint procedures are added under the nodes of the parts needing to be subjected to paint process treatment; adding paint materials required by the painting process to the node of the painting process to obtain a PBOM structure; and 2, converting the PBOM structure into an MBOM structure in the PLM system so as to complete construction of the paint process BOM based on the PLM system. Compared with an original paint process BOM compilation mode of independently establishing a paint assembly, the design is finer and more efficient, an accurate basis can be provided for workshop workers to get materials in an MES system, and material waste is effectively avoided.

Description

Technical Field

[0001] The present invention relates to a method for building a paint process BOM, belongs to the field of computer-aided process design, and in particular to a method for building a paint process BOM based on a PLM system. Background Art

[0002] As a special process auxiliary material, paint should essentially be attached to specific parts rather than exist independently. However, the existing paint process compilation method based on the PLM (Product Lifecycle Management) system usually constructs a BOM (Bill of Materials) structure for paint as an independent component. This paint process compilation method means that when the paint process data is transmitted to ERP (Enterprise Resource Planning) and MES (Manufacturing Execution System), operators can only obtain the overall paint consumption of the project, but cannot accurately identify the actual paint demand of each component. As a result, workers may encounter problems such as mixed and multiple collections in actual operations, resulting in material waste and increased product manufacturing costs. The root cause of these problems is that the existing paint process compilation method is relatively extensive and fails to establish a direct connection between paint process data and specific parts.

[0003] A Chinese patent application with application number CN201510944071.1, filed on December 16, 2015, discloses a color matrix configuration method based on a PLM platform. This method, targeted at PLM system applications in the vehicle industry, creates an enterprise standard color information library, a standard texture information library, and a standard content information library. It supports the effectiveness management of various information libraries through status management and time information management. A systematic structured approach is used to create vehicle color configuration schemes. PBOM and MBOM lists for personalized orders of vehicles containing color information are output through matrix configuration. Dynamic color scheme information is stored, and a scheme export mechanism is established to pass the matrix color scheme BOM to downstream production for guidance. Although this design is simple to operate, easy to use, manages information accurately, effectively improves color configuration quality and efficiency, and meets traceability requirements, it still has the following drawbacks:

[0004] The design does not establish a direct link between paint process data and specific parts.

[0005] The information disclosed in this background technology section is only intended to increase understanding of the overall background of the application and should not be considered as an admission or any form of suggestion that the information constitutes the prior art already known to ordinary technicians in this field. Summary of the Invention

[0006] The purpose of the present invention is to overcome the defects of the existing paint process compilation method that is relatively rough and there is no specific association between paint process data and specific parts, and to provide a refined paint process compilation method, which can establish an association between paint process data and specific parts and build a paint process BOM based on the PLM system.

[0007] To achieve the above objectives, the technical solution of the present invention is:

[0008] A method for building a paint process BOM based on a PLM system, the method comprising the following steps:

[0009] The first step is to create a top-level node for the product in the PLM system. Then, add the product components under the top-level node. Then, add the parts of the components under the nodes of the components. Then, add the required painting process under the nodes of the parts that need to be painted. Finally, add the paint materials required for the painting process under the nodes of the painting process to obtain the PBOM structure.

[0010] In the second step, first select the PBOM structure in the "BOM Management" module in the main interface of the PLM system, enter the BOM editor interface, and then select "PBOM to MBOM" in the BOM editor interface to convert the PBOM structure into an MBOM structure to complete the construction of the paint process BOM based on the PLM system.

[0011] In the first step, the specific steps of adding the required painting process under the node of the part that needs to be painted include:

[0012] First select the part that needs to be painted, then call the process compilation tool under the node of the part, then select "Add process" or "Insert process" in the process compilation tool list, and finally enter the name and description of the painting process.

[0013] In the first step, the specific steps of adding the paint material to the node of the painting process include:

[0014] First open the property sheet of the paint process, and then in the "Material Allocation" or "Resource Allocation" module in the property sheet, add the required paint material information, including material name, code, quantity and unit.

[0015] In the first step, the specific steps of adding product components under the top-level node include:

[0016] First select the top-level node, then enter the structure editing mode, then select "Edit Structure" or "Insert Subitem", open the "New Component" interface and enter the component name and number to complete the operation of adding the product component under the top-level node.

[0017] In the first step, the specific steps of adding parts of the component under the node of the component include:

[0018] First select the node of the component, then enter the component editing interface, then select "Add Part" or "New Sub-item", open the "New Part" interface and enter the part name and number to complete the operation of adding the part of the component under the node of the component.

[0019] In the second step, when converting the PBOM structure into the MBOM structure, it is necessary to configure the conversion rules. The specific steps of configuring the conversion rules are as follows:

[0020] First, click "Conversion Rule Management" in the PBOM toolbar to enter the rule setting interface, then select the "PBOM to MBOM" rule in the rule setting interface, enter the configuration interface, and then select the "Process Node to Part Node" conversion rule in the "Node Mapping" tab in the configuration interface, and check "Enable Paint Material Migration".

[0021] After checking "Enable Paint Material Migration", switch to the "Serial Number Generation" tab in the configuration interface, find "Paint Material Serial Number Strategy", then select "Generate in Reverse Order", set the starting value to "999", the step size to "-1", and finally enter a fixed prefix in the "Prefix" column.

[0022] In the first step, after obtaining the PBOM structure, first enter the attribute configuration interface of the component set to which the part that needs to be painted belongs, and then click the "Add" or "New" button in the attribute configuration interface to create a new attribute and name it "Painting process compilation completed", and then set the attribute default value of the "Painting process compilation completed" to "Unfinished", and then confirm that the paint process compilation is completed, and then update the attribute value of the "Painting process compilation completed" to "Completed".

[0023] In the first step, a painting step needs to be added under the node of the painting process. The specific steps of adding the painting step include:

[0024] First select the node of the painting process, then enter the editing interface of the painting process, and then select "Add step" or "New sub-item" in the editing interface, open the "New step" interface to compile the specific content of the painting step, including the name and number of the painting step.

[0025] The specific contents of the painting process also include: coating location, area, wet film thickness, dry film thickness, color, material name, material code, consumption, unit, temperature, minimum value, maximum value, nozzle specifications, relative humidity, surface cleanliness, coating thickness, mixing parameters, adhesion standard, workshop, diluent ratio, pre-reaction time, mixing trial period, filter specifications, and varnish information.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. In a method for building a paint process BOM based on a PLM system, the present invention includes the following steps: first, creating a top-level node of product A in the PLM system, adding components of product A and parts under the components in sequence, then adding a paint process under the node of the part requiring paint process treatment, and adding the required paint materials to the node of the paint process to form a PBOM structure; second, first, selecting the PBOM structure in the "BOM Management" module in the main interface of the PLM system, entering the BOM editor interface, and then selecting "PBOM to MBOM" in the BOM editor interface to convert the PBOM structure into an MBOM structure, thereby completing the construction of the paint process BOM based on the PLM system. By directly mounting the paint materials to the paint process node of the specific part in the PLM system, the paint materials and parts are closely combined, and the precise consumption of the same specification of paint required for each part requiring paint process treatment in the paint process is clearly defined, avoiding the ambiguity of traditional labeling methods, improving the refinement level of process compilation, and providing a standardized data interface for material collection in the MES system. Workers can accurately collect materials based on the material requirements clearly specified in the BOM, eliminating material waste caused by blind multiple collections from the source, and effectively reducing product manufacturing costs. Therefore, the present invention realizes the close combination of paint materials and parts, and the refinement level of process preparation is high, thereby reducing material waste and lowering product manufacturing costs.

[0028] 2. In the method for building a paint process BOM based on a PLM system of the present invention, in the second step, when converting the PBOM structure into the MBOM structure, it is also necessary to configure the conversion rules. First, click "Conversion Rule Management" in the PBOM toolbar to enter the rule setting interface, then select the "PBOM to MBOM" rule in the rule setting interface, enter the configuration interface, and then select the "Process Node to Part Node" conversion rule in the "Node Mapping" tab in the configuration interface, and check "Enable Paint Material Migration". Through such settings, in the subsequent process of converting the PBOM structure into the MBOM structure, the paint material originally mounted under the paint process node of the PBOM structure can be re-associated with the paint process node in the MBOM structure. The direct subordinate node of the part to which the material belongs; Next, the operator needs to switch to the "Serial Number Generation" tab in the configuration interface, find the "Paint Material Serial Number Strategy", to ensure the logic and orderliness of the serial number, select the "Reverse Generation" method, and set the starting value to "999", the step size to "-1", and finally enter a fixed prefix in the "Prefix" column. When the part node serial number (fixed prefix) is 001007001, the BOM serial number of the paint material is 001007001999, 001007001998, 001007001997, etc., and this inverted method of the BOM serial number helps to clearly show the hierarchical relationship and the order of use of the paint material, ensuring the uniqueness and traceability of the paint material information. Therefore, the present invention can clearly define the hierarchical relationship and the order of use of the paint material, ensuring the uniqueness and traceability of the paint material information.

[0029] 3. In a method for building a paint process BOM based on a PLM system of the present invention, in the first step, after obtaining the PBOM structure, first enter the attribute configuration interface of the component set to which the part that needs to be painted is subjected, and then click the "Add" or "New" button in the attribute configuration interface to create a new attribute and name it "Paint process compilation completed", and then set the attribute default value of "Paint process compilation completed" to "Unfinished", and then confirm that the paint process compilation is completed, and then update the attribute value of "Paint process compilation completed" to "Completed"; when the attribute value of "Paint process compilation completed" is "Unfinished", the paint process data will be locked and cannot be transmitted to the downstream system, but other process data can be transmitted normally; when the attribute value of "Paint process compilation completed" is updated to "Completed", the paint process data can be transmitted normally, which realizes the separate transmission of paint process data and other process data, and can carry out preliminary paint process compilation work in advance without affecting other BOM materials and process compilation and data transmission, and can flexibly control the transmission timing of paint process data to ensure that it is transmitted to the downstream system at the appropriate time, meet the needs of actual product processing and manufacturing, effectively shorten the paint process compilation cycle, and improve compilation flexibility. Therefore, the present invention not only shortens the paint process preparation cycle, but also improves the flexibility of paint process preparation.

[0030] 4. In the method for building a paint process BOM based on a PLM system of the present invention, in the first step, a paint step needs to be added under the node of the paint process. The specific steps of adding the paint step include: first selecting the node of the paint process, then entering the editing interface of the paint process, and then selecting "Add step" or "New sub-item" in the editing interface, opening the "New step" interface to compile the specific content of the paint step, the specific content includes the name and number of the paint step; the specific content of the paint step also includes: coating part, area, wet film thickness, dry film thickness, color, material name, material code, consumption, unit , temperature, minimum value, maximum value, nozzle specifications, relative humidity, surface cleanliness, coating thickness, ratio parameters, adhesion standard, use workshop, diluent ratio, pre-reaction time, mixing trial period, filter specifications, varnish information, by compiling the content of the painting steps in detail under the specific painting process, after the paint process data is transferred to the downstream MES system, it can provide workers with a basis for efficient and high-quality operations, thereby realizing the refined management and control of the painting process; at the same time, by clarifying the process parameters and material information, the stability and consistency of the paint coating process are ensured, thereby improving the management accuracy of the painting process and the product quality. Therefore, the present invention realizes the refined management of the painting process and ensures the delivery of high-quality products by compiling the content of the painting steps in detail in the specific painting process. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1It is a schematic diagram of the PBOM structure of the present invention.

[0032] Figure 2 Schematic diagram of the MBOM structure of the present invention.

[0033] Figure 3 yes Figure 1 The PBOM structure is a structural diagram after adding the status mark of "painting process preparation completed" to the parts that need to undergo painting process.

[0034] Figure 4 It is a schematic diagram that illustrates the specific contents of the painting steps in the painting process.

[0035] Figure 5 Schematic diagram of the PBOM and MBOM structures of product A constructed according to the method of the present invention in Example 1.

[0036] Figure 6 This is a schematic diagram of the PBOM and MBOM structures of product A according to the conventional paint process BOM construction method in Example 1. DETAILED DESCRIPTION

[0037] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0038] See also Figure 1 — Figure 6 A method for building a paint process BOM based on a PLM system, the method comprising the following steps:

[0039] The first step is to create a top-level node for the product in the PLM system. Then, add the product components under the top-level node. Then, add the parts of the components under the nodes of the components. Then, add the required painting process under the nodes of the parts that need to be painted. Finally, add the paint materials required for the painting process under the nodes of the painting process to obtain the PBOM structure.

[0040] In the second step, first select the PBOM structure in the "BOM Management" module in the main interface of the PLM system, enter the BOM editor interface, and then select "PBOM to MBOM" in the BOM editor interface to convert the PBOM structure into an MBOM structure to complete the construction of the paint process BOM based on the PLM system.

[0041] In the first step, the specific steps of adding the required painting process under the node of the part that needs to be painted include:

[0042] First select the part that needs to be painted, then call the process compilation tool under the node of the part, then select "Add process" or "Insert process" in the process compilation tool list, and finally enter the name and description of the painting process.

[0043] In the first step, the specific steps of adding the paint material to the node of the painting process include:

[0044] First open the property sheet of the paint process, and then in the "Material Allocation" or "Resource Allocation" module in the property sheet, add the required paint material information, including material name, code, quantity and unit.

[0045] In the first step, the specific steps of adding product components under the top-level node include:

[0046] First select the top-level node, then enter the structure editing mode, then select "Edit Structure" or "Insert Subitem", open the "New Component" interface and enter the component name and number to complete the operation of adding the product component under the top-level node.

[0047] In the first step, the specific steps of adding parts of the component under the node of the component include:

[0048] First select the node of the component, then enter the component editing interface, then select "Add Part" or "New Sub-item", open the "New Part" interface and enter the part name and number to complete the operation of adding the part of the component under the node of the component.

[0049] In the second step, when converting the PBOM structure into the MBOM structure, it is necessary to configure the conversion rules. The specific steps of configuring the conversion rules are as follows:

[0050] First, click "Conversion Rule Management" in the PBOM toolbar to enter the rule setting interface, then select the "PBOM to MBOM" rule in the rule setting interface, enter the configuration interface, and then select the "Process Node to Part Node" conversion rule in the "Node Mapping" tab in the configuration interface, and check "Enable Paint Material Migration".

[0051] After checking "Enable Paint Material Migration", switch to the "Serial Number Generation" tab in the configuration interface, find "Paint Material Serial Number Strategy", then select "Generate in Reverse Order", set the starting value to "999", the step size to "-1", and finally enter a fixed prefix in the "Prefix" column.

[0052] In the first step, after obtaining the PBOM structure, first enter the attribute configuration interface of the component set to which the part that needs to be painted belongs, and then click the "Add" or "New" button in the attribute configuration interface to create a new attribute and name it "Painting process compilation completed", and then set the attribute default value of the "Painting process compilation completed" to "Unfinished", and then confirm that the paint process compilation is completed, and then update the attribute value of the "Painting process compilation completed" to "Completed".

[0053] In the first step, a painting step needs to be added under the node of the painting process. The specific steps of adding the painting step include:

[0054] First select the node of the painting process, then enter the editing interface of the painting process, and then select "Add step" or "New sub-item" in the editing interface, open the "New step" interface to compile the specific content of the painting step, including the name and number of the painting step.

[0055] The specific contents of the painting process also include: coating location, area, wet film thickness, dry film thickness, color, material name, material code, consumption, unit, temperature, minimum value, maximum value, nozzle specifications, relative humidity, surface cleanliness, coating thickness, mixing parameters, adhesion standard, workshop, diluent ratio, pre-reaction time, mixing trial period, filter specifications, and varnish information.

[0056] The supplementary technical features of the present invention are as follows:

[0057] In the past, when building a paint process BOM in a PLM system, the choice was usually to create a separate paint department set for node construction, rather than directly linking paint materials to the paint process corresponding to a specific part. This approach was mainly limited by the following two factors: First, the limitations of the PLM system's functionality. The older version of the PLM system was relatively weak and did not have the function of adding and binding paint processes to parts. It could only indicate that a part had a paint process through simple annotations, and it could not provide the conditions and functions for directly compiling paint materials under the part node, making it difficult to meet the current refined management requirements; Second, the limitations of process compilation specifications and management. The process compilation specifications at the time did not require compilation according to the existing refined methods, and the workshop had not yet implemented an MES system, which could not effectively support the refined management methods. However, the functionality of the current PLM system has been significantly improved. It can directly bind paint processes to parts and support the direct addition of paint materials under the paint process node. This allows for more refined paint BOM construction and management in the PLM system.

[0058] Example 1:

[0059] See also Figure 1 — Figure 6 A method for building a paint process BOM based on a PLM system includes the following steps: first, create a top-level node of a product in the PLM system, then add components of the product under the top-level node, then add parts of the component under the component node, then add the required painting process under the node of the part that needs to be painted, and then add the paint materials required for the painting process to the node of the painting process to obtain a PBOM structure; second, first select the PBOM structure in the "BOM Management" module in the main interface of the PLM system, enter the BOM editor interface, and then select "PBOM to MBOM" in the BOM editor interface to convert the PBOM structure into an MBOM structure to complete the construction of the paint process BOM based on the PLM system.

[0060] When applied, the paint material is directly mounted under the paint process node of the specific component in the PLM system, thereby associating the paint material with the component, clarifying the precise consumption of the same specification of paint required for each component in the corresponding painting process, and improving the refinement of the paint process compilation.

[0061] As shown in the table below, product A consists of parts B and C, part B consists of parts B1 and B2, and part B2 consists of B21, B22, and B23.

[0062]

[0063] According to the paint process BOM construction method of the present invention, the paint materials are mounted under the specific paint process, and the PBOM and MBOM structures of product A are as follows: Figure 5 As shown in the figure, paint materials are directly associated with specific parts. According to the previous paint process BOM construction method, paint materials are mounted under a separate paint part. The PBOM and MBOM structures of product A are as follows: Figure 6 As shown, there is no direct correlation between the paint material and the specific parts.

[0064] Example 2:

[0065] The basic content is the same as Example 1, except that:

[0066] In the second step, when converting the PBOM structure to the MBOM structure, you also need to configure the conversion rules. The specific steps for configuring the conversion rules are: first click "Conversion Rule Management" in the PBOM toolbar to enter the rule setting interface, then select the "PBOM to MBOM" rule in the rule setting interface, enter the configuration interface, and then select the "Process Node to Part Node" conversion rule in the "Node Mapping" tab in the configuration interface, and check "Enable Paint Material Migration"; after checking "Enable Paint Material Migration", switch to the "Serial Number Generation" tab in the configuration interface, find "Paint Material Serial Number Strategy", then select "Reverse Order Generation", and set the starting value to "999", the step size to "-1", and finally enter a fixed prefix in the "Prefix" column.

[0067] When applied, the PBOM is automatically converted into the MBOM through the logical operation of the PLM system. When the PBOM contains a node for the painting process, the PLM converts the paint material mounted under the painting process node into the direct subordinate node of the corresponding part in the MBOM. The node serial numbers are reversed from 999, 998, 997... For example, when the part node serial number is 001007001, the BOM serial numbers of the paint material are 001007001999, 001007001998, and 001007001997 respectively. This reverse order of BOM serial numbers helps to clarify the hierarchical relationship and usage order of paint materials, ensuring the uniqueness and traceability of paint material information.

[0068] Example 3:

[0069] The basic content is the same as Example 1, except that:

[0070] See also Figure 3 In the first step, after obtaining the PBOM structure, first enter the attribute configuration interface of the component set to which the part that needs to be painted belongs, and then click the "Add" or "New" button in the attribute configuration interface to create a new attribute and name it "Painting process compilation completed", and then set the default value of the attribute of "Painting process compilation completed" to "Unfinished", and then confirm that the paint process compilation is completed, and then update the attribute value of "Painting process compilation completed" to "Completed".

[0071] When applied, by adding the "Paint process preparation completed" attribute to the part package where the paint process parts are located, the paint data and other process data can be separated and transmitted. This allows preliminary paint process preparation work to be carried out in advance without affecting other BOM materials and process preparation and data transmission to downstream. Especially in the field of shipbuilding, paint technical specifications usually lag behind product manufacturing and processing requirements, and often need to be finalized after most parts are manufactured. By changing the attribute value of "Paint process preparation completed", the transmission of paint process data can be flexibly controlled to ensure that it is transmitted to the downstream system at the appropriate time to meet the actual product processing and manufacturing needs.

[0072] Example 4:

[0073] The basic content is the same as Example 1, except that:

[0074] See also Figure 4 In the first step, a painting step needs to be added under the node of the painting process. The specific steps for adding a painting step include: first select the node of the painting process, then enter the editing interface of the painting process, and then select "Add step" or "New sub-item" in the editing interface, open the "New step" interface to compile the specific content of the painting step, the specific content includes the name and number of the painting step; the specific content of the painting step also includes: coating part, area, wet film thickness, dry film thickness, color, material name, material code, consumption, unit, temperature, minimum value, maximum value, nozzle specifications, relative humidity, surface cleanliness, coating thickness, ratio parameters, adhesion standard, use workshop, diluent ratio, pre-reaction time, mixing trial period, filter specifications, varnish information.

[0075] When applied, by compiling the content of the painting steps in detail under the specific painting process and transmitting the paint process data to the downstream MES system, it can provide workers with a basis for efficient and high-quality operations, thereby realizing refined control of the painting process; by clarifying the process parameters and material information, it ensures the stability and consistency of the paint coating process, thereby improving the management accuracy of the painting process and product quality.

[0076] The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiment. Any equivalent modifications or changes made by ordinary technicians in this field based on the contents disclosed in the present invention should be included in the protection scope recorded in the claims.

Claims

1. A method for building a paint process BOM based on a PLM system, characterized by: The construction method comprises the following steps: The first step is to create a top-level node for the product in the PLM system. Then, add the product components under the top-level node. Then, add the parts of the components under the nodes of the components. Then, add the required painting process under the nodes of the parts that need to be painted. Finally, add the paint materials required for the painting process under the nodes of the painting process to obtain the PBOM structure. In the second step, select the PBOM structure in the "BOM Management" module in the PLM system main interface, enter the BOM editor interface, and then select "PBOM to MBOM" in the BOM editor interface to convert the PBOM structure into an MBOM structure to complete the construction of the paint process BOM based on the PLM system.

2. The method for constructing a paint process BOM based on a PLM system according to claim 1, characterized in that: In the first step, the specific steps of adding the required painting process under the node of the part that needs to be painted include: First, select the part that requires painting. Then, call the process compilation tool under the part's node. Then, select "Add Process" or "Insert Process" in the process compilation tool list. Finally, enter the name and description of the painting process.

3. The method for constructing a paint process BOM based on a PLM system according to claim 2, characterized in that: In the first step, the specific steps of adding the paint material to the node of the painting process include: First, open the property sheet for the paint process. Then, in the Material Allocation or Resource Allocation module within the property sheet, add the required paint material information, including the material name, code, quantity, and unit.

4. The method for constructing a paint process BOM based on a PLM system according to claim 1, 2 or 3, characterized in that: In the first step, the specific steps of adding product components under the top-level node include: First, select the top-level node, then enter structure editing mode. Then select "Edit Structure" or "Insert Subitem" to open the "New Component" interface and enter the component name and number to complete the operation of adding a product component under the top-level node.

5. The method for constructing a paint process BOM based on a PLM system according to claim 4, characterized in that: In the first step, the specific steps of adding parts of the component under the node of the component include: First, select the node of the component in question, then enter the component editing interface. Then select "Add Part" or "New Sub-item" to open the "New Part" interface and enter the part name and number to complete the operation of adding the component part under the node of the component in question.

6. The method for constructing a paint process BOM based on a PLM system according to claim 1, 2 or 3, characterized in that: In the second step, when converting the PBOM structure into the MBOM structure, it is necessary to configure the conversion rules. The specific steps of configuring the conversion rules are as follows: First, click "Conversion Rule Management" in the PBOM toolbar to enter the rule setting interface. Then, select the "PBOM to MBOM" rule in the rule setting interface to enter the configuration interface. Then, on the "Node Mapping" tab in the configuration interface, select the "Process Node to Part Node" conversion rule and check "Enable Paint Material Migration." 7. The method for constructing a paint process BOM based on a PLM system according to claim 6, characterized in that: After selecting "Enable Paint Material Migration," switch to the "Serial Number Generation" tab in the configuration interface, find "Paint Material Serial Number Strategy," select "Generate in Reverse Order," set the starting value to "999," the step size to "-1," and enter a fixed prefix in the "Prefix" field.

8. The method for constructing a paint process BOM based on a PLM system according to claim 1, 2 or 3, characterized in that: In the first step, after obtaining the PBOM structure, first enter the attribute configuration interface of the component set to which the part that needs to be painted belongs, and then click the "Add" or "New" button in the attribute configuration interface to create a new attribute and name it "Painting process compilation completed", and then set the attribute default value of the "Painting process compilation completed" to "Unfinished", and then confirm that the paint process compilation is completed, and then update the attribute value of the "Painting process compilation completed" to "Completed".

9. The method for constructing a paint process BOM based on a PLM system according to claim 1, 2 or 3, characterized in that: In the first step, a painting step needs to be added under the node of the painting process. The specific steps of adding the painting step include: First, select the node of the painting process, then enter the editing interface of the painting process. Then, select "Add Step" or "New Sub-item" in the editing interface. Open the "New Step" interface to edit the specific content of the painting step, including the name and number of the painting step.

10. The method for constructing a paint process BOM based on a PLM system according to claim 9, characterized in that: The specific contents of the painting process also include: coating location, area, wet film thickness, dry film thickness, color, material name, material code, consumption, unit, temperature, minimum value, maximum value, nozzle specifications, relative humidity, surface cleanliness, coating thickness, mixing parameters, adhesion standard, workshop, diluent ratio, pre-reaction time, mixing trial period, filter specifications, and varnish information.

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