An intelligent detection method for defective factors of industrial spraying workpieces based on graph neural network model

Abstract

The present invention discloses an intelligent detection method for defective factors of industrial spray-painted workpieces based on a graph neural network model. The method comprises the following steps: obtaining various parameters during the workpiece production process, including carriage environment parameters, drying room environment parameters, paint quality parameters, and spray equipment parameters; constructing a feature vector for each workpiece node based on various parameters during the production process, corresponding to each workpiece; aggregating and updating the feature vectors of each workpiece node based on the graph neural network model, and performing high-dimensional feature representation on the updated feature vectors; optimizing the parameters of the graph neural network model using a backpropagation algorithm based on the high-dimensional features of the workpiece; and predicting the defective factors of the workpiece based on the optimized graph neural network model, and outputting the type of the defective factor. The method is suitable for real-time detection of industrial production lines. By collecting data for each workpiece and inputting it into the graph neural network model, rapid and real-time detection of defective factors can be achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of workpiece detection, and in particular relates to an intelligent detection method for defective factors of industrial spraying workpieces based on a graph neural network model. Background Art

[0002] In modern industrial manufacturing, spray coating is widely used for surface treatment of components in industries such as automotive, aviation, and electronic equipment. Spray coating not only improves the appearance of components but also provides functional protection, such as corrosion and wear resistance. However, the quality of spray coating is highly susceptible to various external factors, such as ambient humidity, temperature, dust, and spray equipment parameters. These uncertainties can lead to uneven color, particles, scratches, and other undesirable effects on sprayed workpieces, thus affecting the final product quality.

[0003] Currently, quality inspection methods for industrial spray-painted workpieces rely heavily on manual empirical analysis or simple statistical methods. These methods suffer from inadequate accuracy, low efficiency, and high labor costs in practical applications. The limitations of manual analysis are particularly pronounced on large-scale production lines. With the rapid development of intelligent manufacturing and automation technologies, automated cause detection solutions based on artificial intelligence (AI) are becoming a mainstream approach to addressing the problem of defective product cause analysis.

[0004] Limitations of Manual Analysis: Traditionally, detecting the causes of defective sprayed workpieces relies primarily on manual analysis, which is not only time-consuming and inefficient, but also often results in inconsistent results due to subjective judgment. Furthermore, manual analysis struggles to meet the real-time demands of mass production environments, especially when multiple environmental factors contribute to defective products. This makes analysis challenging and can easily overlook subtle factors.

[0005] Limitations of Traditional Data Statistics: Automated cause analysis methods based on statistics and simple rules can sometimes assist manual inspections, but these methods often rely on handcrafted features and struggle to cope with complex production environments. Because the quality of sprayed workpieces is affected by a variety of environmental and equipment parameters, simple statistical methods struggle to capture the complex relationships between these parameters, resulting in low accuracy in cause identification.

[0006] Multi-parameter influences are difficult to effectively model: The quality of sprayed workpieces is not only limited by the quality of the surface coating, but also by multiple factors such as ambient humidity, temperature, air pressure, and spray pressure. Traditional machine learning models struggle to process such a multi-dimensional array of parameters, and even more so to capture the complex relationships between them, making it difficult to accurately identify the root causes of defective products.

[0007] In recent years, graph neural networks (GNNs), as an important model in deep learning, have been widely used in various fields. To address the above issues, it is urgent to propose an intelligent detection method for defective factors in industrial spraying workpieces based on the GNN model. Summary of the Invention

[0008] In order to solve the above technical problems, the present invention proposes an intelligent detection method for defective factors of industrial spraying workpieces based on a graph neural network model to solve the problems existing in the above-mentioned prior art.

[0009] To achieve the above objectives, the present invention provides an intelligent detection method for defective factors of industrial spraying workpieces based on a graph neural network model, comprising the following steps:

[0010] Obtain various parameters during the workpiece production process, including carriage environment parameters, drying room environment parameters, paint quality parameters, and spraying equipment parameters;

[0011] Each workpiece corresponds to a node, and the feature vector of each workpiece node is constructed based on various parameters in the production process;

[0012] Aggregating and updating the feature vectors of each workpiece node based on a graph neural network model, and performing high-dimensional feature representation on the updated feature vectors;

[0013] Based on the high-dimensional features of the workpiece, a back-propagation algorithm is used to optimize the parameters of the graph neural network model;

[0014] Based on the optimized graph neural network model, the defective factors of the workpiece are predicted and the types of defective factors are output.

[0015] Optionally, the cabin environment parameters include cabin humidity, cabin temperature, cabin dust particle size, cabin air pressure, cabin air flow, and cabin electrostatic voltage;

[0016] The drying chamber environmental parameters include drying chamber humidity, drying chamber temperature, drying chamber airflow, drying chamber dust particle size, drying chamber air pressure, drying chamber electrostatic voltage and drying chamber drying time;

[0017] The paint quality parameters include paint brand, paint production time and paint to thinner ratio;

[0018] The spraying equipment parameters include spray gun spray pressure, nozzle size, spray angle, spray speed and spray distance.

[0019] Optionally, the formula for aggregating and updating the feature vector of each workpiece node based on the graph neural network is as follows:

[0020]

[0021] in, represents the feature representation of node i at the kth layer, N(i) is the set of neighbor nodes of node i, and W (k) and is the learnable weight matrix, σ is the nonlinear activation function, d i and d j are the degrees of node i and node j respectively.

[0022] Optionally, the process of optimizing the parameters of the graph neural network model using a back propagation algorithm based on the high-dimensional features of the workpiece includes:

[0023] The high-dimensional features of the artifacts are fed back to the reverse learning layer to generate a new representation of the original data, which is used to guide the aggregation and update process of the feature vector.

[0024] Optionally, the formula for guiding the aggregation and updating process of the feature vector based on the new representation is as follows:

[0025]

[0026] Where, P is the target matrix; s ij is the incidence matrix element; ||·|| F represents the Frobenius norm; S is the auxiliary matrix; is the original data matrix; is a low-dimensional embedding matrix; is the cluster center matrix.

[0027] Optionally, it also includes performing feature weight analysis on high-dimensional features to obtain the degree of influence of various parameters on defective product factors.

[0028] Optionally, the loss function of the graph neural network model is a cross entropy loss function, and the formula is as follows:

[0029]

[0030] Among them, y i is the true label, is the predicted value of the model.

[0031] The present invention also provides an electronic device comprising: a memory and a processor; the memory is used to store a program; the processor is used to execute the program to implement the various steps of the intelligent detection method for defective factors of industrial spraying workpieces based on a graph neural network model.

[0032] The present invention also provides a readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the various steps of the intelligent detection method of defective factors of industrial spraying workpieces based on a graph neural network model are implemented.

[0033] Compared with the prior art, the present invention has the following advantages and technical effects:

[0034] Multi-factor association modeling: Traditional methods have difficulty processing multi-dimensional production parameters. However, this invention uses a graph neural network model to integrate multiple factors such as ambient humidity, temperature, and spray equipment parameters into a graph structure, capturing the complex relationship between various parameters in the graph, thereby more comprehensively reflecting the multi-factor interaction in the production process.

[0035] Automated and High-Precision Cause Identification: Through the aggregation and learning mechanisms of a graph neural network model, this invention automatically analyzes information about each workpiece and its neighboring nodes, deeply exploring potential causes of defective products. Compared to manual inspection and traditional statistical methods, graph neural network models offer significant advantages in extracting and correlating complex features, helping to improve the accuracy of cause detection.

[0036] Real-time and high efficiency: The present invention can be deployed in real time on the production line to perform real-time analysis of the quality factors of each workpiece, which not only greatly improves the detection efficiency, but also can promptly identify and provide feedback on key factors that may lead to defective products, providing support for timely adjustment of production parameters, thereby effectively improving production quality.

[0037] Adaptability to complex production environments: The node and edge structure of the graph neural network model is suitable for the complex environment in industrial manufacturing. It can not only process the characteristics of individual workpieces, but also reflect the production association relationship between workpieces. Especially in large-scale production scenarios, this method can maintain stability and robustness and adapt to complex and changing production conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of this application. The exemplary embodiments and descriptions of this application are intended to explain this application and do not constitute an improper limitation on this application. In the accompanying drawings:

[0039] Figure 1 This is a flow chart of an intelligent detection method for defective factors of industrial spraying workpieces based on a graph neural network model according to an embodiment of the present invention. DETAILED DESCRIPTION

[0040] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0041] It should be noted that the steps shown in the flowcharts of the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and that, although a logical order is shown in the flowcharts, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0042] Example 1

[0043] like Figure 1 As shown, this embodiment provides an intelligent detection method for defective factors of industrial spraying workpieces based on a graph neural network model, including the following steps:

[0044] Obtain various parameters during the workpiece production process, including carriage environment parameters, drying room environment parameters, paint quality parameters, and spraying equipment parameters;

[0045] Each workpiece corresponds to a node, and the feature vector of each workpiece node is constructed based on various parameters in the production process;

[0046] Aggregating and updating the feature vectors of each workpiece node based on a graph neural network model, and performing high-dimensional feature representation on the updated feature vectors;

[0047] Based on the high-dimensional features of the workpiece, a back-propagation algorithm is used to optimize the parameters of the graph neural network model;

[0048] Based on the optimized graph neural network model, defective products of the workpiece are predicted and the type of defective products is output.

[0049] To accurately model and detect defective products, key variables in the production process must first be numbered and categorized. These parameters are primarily divided into four categories: cabin environment parameters, drying room environment parameters, paint quality parameters, and spray equipment parameters. Cabin environment parameters include cabin humidity, cabin temperature, cabin dust particle size, cabin air pressure, cabin airflow, and cabin static voltage. Drying room environment parameters include drying room humidity, drying room temperature, drying room airflow, drying room dust particle size, drying room air pressure, drying room static voltage, and drying room drying time. Paint quality parameters include paint brand, paint production time, and the paint-to-thinner ratio. Spray equipment parameters include spray gun spray pressure, nozzle size, spray angle, spray speed, and spray distance.

[0050] Specifically, the environmental conditions in the carriage (i.e., the assembly line area where the workpiece is located) have a direct impact on the spraying quality. The environmental parameters of carriage 1, carriage 2, ... carriage n are as follows, and the design variable number is C ij , where i represents the carriage number, j represents the environmental parameter, and is expressed as the ambient humidity C i1 , temperature C i2 , dust particle size C i3, air pressure C i4 ,, airflow C i5 , electrostatic voltage C i6 The environmental conditions of the drying room directly affect the curing effect of the coating. The environmental parameters of the drying room are numbered as D j , where j represents the parameter type, which is represented by ambient humidity D1, temperature D2, airflow D3, dust particle size D4, air pressure D5, electrostatic voltage D6, and drying time D7. The quality of paint affects the final effect of the sprayed workpiece. The paint quality parameter number is P j , expressed as paint brand P1, production time P2, paint and thinner ratio P3. The operating parameters of the spraying equipment are important factors that directly affect the spraying results. The spraying equipment parameter number is E j , expressed as spray gun spray pressure E1, nozzle size E2, spray angle E3, spray speed E4, and spray distance E5.

[0051] As a specific embodiment, this embodiment integrates a real-time data acquisition system, uses sensor networks and wireless communication technologies to dynamically collect multi-dimensional data of assembly line workpieces, and inputs it into a graph neural network model for online detection, thereby realizing real-time quality monitoring on the production line.

[0052] This embodiment uses the following method to represent the various parameter data collected:

[0053] Node: Each workpiece corresponds to a node. The attributes of the node include parameters related to the workpiece, such as environment, equipment, paint, etc.

[0054] Edge: The edge connecting different workpieces represents the relationship between the workpieces in the same production batch. It can be used to model the impact of different carriages, spray equipment, etc. on the workpieces.

[0055] Node features: feature vector X of each workpiece node i It consists of various parameters of the workpiece:

[0056] X i =[C i1 ,C i2 ,C i3 ,C i4 ,C i5 ,C i6 ,D1,D2,D3,D4,D5,D6,D7,P1,P2,P3,E1,E2,E3,E4,E5];

[0057] Edge features: Edge features represent the mutual influence between adjacent workpieces and can be modeled based on the process connection relationship between carriages or spraying batches.

[0058] Graph construction:

[0059] Each workpiece is modeled as a node in a graph G = (V, E), where V is the set of nodes and E is the set of edges. An edge (i, j) ∈ E(i, j) between workpieces represents a relationship between them, such as those produced in the same batch or on the same train. The existence and weight of edges can be based on different physical connections or production processes.

[0060] This embodiment jointly models multiple parameters involved in the spraying process, such as ambient humidity, temperature, airflow, and equipment parameters, to construct a dynamic graph structure. Each workpiece node not only has its own characteristics, but can also be comprehensively analyzed by combining the characteristic information of neighboring nodes.

[0061] Adjacency matrix A: The adjacency matrix A represents the connection relationship between nodes. ij Indicates whether there is an edge connection between artifact i and artifact j.

[0062]

[0063] Based on the adjacency relationship between artifacts, the Graph Neural Network (GNN) aggregates and updates the features of nodes through graph convolution operations. The representation of nodes in each layer is updated by the features of neighboring nodes. In the kth layer, the representation of node i is Updated by the following formula:

[0064]

[0065] in, represents the feature representation of node i at the kth layer, N(i) is the set of neighbor nodes of node i, and W (k) and is a learnable weight matrix, σ is a nonlinear activation function (such as ReLU), d i and d j are the degrees of node i and node j respectively.

[0066] Node Embedding and Backpropagation:

[0067] After multiple layers of graph convolution, the feature vector of the workpiece node It contains multi-level information and is embedded in high-dimensional space.

[0068] The embedding layer Z is used to represent the node features after multi-layer convolution into high-dimensional features. These high-dimensional features can characterize the overall quality status of the workpiece. After embedding, the representation of node i is:

[0069]

[0070] During the back propagation process, the graph learning layer generates a new graph S, which is combined with the original graph A to form an updated graph A′. The updated graph and input features are then fed into the GNN layer for feature learning. The node embedding Z generated by the GNN layer is further fed into the reverse learning layer to generate a new representation ZP of the original data for L RGL and L RL Guided graph learning layer. The dotted line indicates the path of loss.

[0071]

[0072] Among them, P is the target matrix, which is the representation of the input data; P i is the predicted value of the i-th sample; s ij Is the element of the correlation matrix, indicating the similarity or correlation between sample i and sample j; ||·|| F represents the Frobenius norm, which measures the size of the matrix; S is the auxiliary matrix used to adjust the calculation of the correlation degree. is the original data matrix, each row represents the features of a data point; Is a low-dimensional embedding matrix, which means that the data Features mapped to low-dimensional space; is the cluster center matrix.

[0073] Defective product detection and classification:

[0074] After the forward propagation of the graph neural network, by inputting the type of defective products, the output layer will classify the defective products based on the node embedding features and analyze the output state points [C i1 ,C i2 ,C i3 ,C i4 ,C i5 ,C i6 ,D1,D2,D3,D4,D5,D6,D7,P1,P2,P3,E1,E2,E3,E4,E5] are represented by black and white. The ones close to black indicate that the correlation between the defective product type and this node is strong, and those close to white indicate that the correlation is not strong. The goal of the model is to predict the relevant factors of each workpiece being a defective product and to give the specific correlation factors of the defective type (such as uneven color, particles, scratches, etc.).

[0075] Classification output: The embedded representation of the node is used through the fully connected layer and the softmax function to classify the defective product. The associated factor value is:

[0076]

[0077] Among them, y i is the node result of node i, W fis the weight of the classification layer, b f is the bias term, represents the feature representation of the i-th sample at the K-th layer.

[0078] Loss function: The model uses the cross entropy loss function to measure the gap between the predicted results and the true labels:

[0079]

[0080] Among them, y i is the true label, is the predicted value of the model, and N is the number of samples.

[0081] Result output and optimization:

[0082] After forward propagation and back propagation of the model, the model finally outputs the associated factors of whether each workpiece is a defective product, that is, the factors that cause this category of defective products, and the production process can be further optimized based on the results. The specific steps include:

[0083] Defective product category factor prediction: The model outputs prediction results, showing the associated factors for each workpiece with problems such as uneven color, particles, scratches, etc.

[0084] Feature weight analysis: By analyzing the high-dimensional features embedded in the nodes, it is possible to identify which environmental or equipment parameters have a greater impact on defective products.

[0085] The key point of this invention is to use a graph neural network model, combined with the complex environment and equipment parameters of the industrial spraying process, to detect the spraying quality of workpieces in real time. The key lies in its ability to effectively process multidimensional data in industrial production lines, especially the correlations between workpieces and the dynamic changes in environmental parameters, thereby achieving automated spraying quality and intelligent detection of defective product factors.

[0086] The key points are as follows:

[0087] 1. Data modeling and detection method based on graph neural network model: By constructing the multi-dimensional production process data of the workpiece (including environmental parameters, equipment parameters, paint quality, etc.) into a graph structure, the graph neural network is used to perform convolution aggregation on the node (workpiece) features, and the complex relationship between the workpiece and neighboring nodes is learned layer by layer, finally realizing the intelligent detection of defective factors of the workpiece spraying quality.

[0088] 2. Multi-parameter Joint Modeling and Dynamic Graph Structure: Multiple parameters involved in the spraying process (such as ambient humidity, temperature, airflow, and equipment parameters) are jointly modeled to construct a dynamic graph structure. Each workpiece node not only has its own characteristics, but also can be comprehensively analyzed by combining the characteristics of neighboring nodes.

[0089] 3. Classification and prediction of defective products in industrial production: Through the embedding layer and back-propagation mechanism of the graph neural network, the model can identify defective phenomena in workpieces in real time, including surface defects such as uneven color, particles, and scratches, and classify and predict different types of defective products based on factors.

[0090] 4. Intelligent feedback and optimization based on environmental and equipment data: By correlating and analyzing the collected environmental data, equipment parameters and workpiece spraying quality, the system can feedback which parameters affect the quality of the workpiece based on the learning results of the GNN model, and make optimization suggestions, automatically adjust production parameters and reduce the defective product rate.

[0091] 5. Real-time data acquisition and online detection system: The real-time data acquisition system is integrated, using sensor networks and wireless communication technologies to dynamically collect multi-dimensional data of assembly line workpieces and input it into the GNN model for online detection, realizing real-time quality monitoring on the production line.

[0092] 6. GNN model embedding layer and back-propagation optimization: The GNN embedding layer extracts high-dimensional features of the workpiece, and the back-propagation algorithm optimizes the model parameters, gradually improving the accuracy of workpiece quality prediction and the generalization ability of the model, ensuring that the system can accurately judge the quality of the sprayed workpiece.

[0093] Example 2

[0094] The present invention also provides an electronic device comprising: a memory and a processor; the memory is used to store a program; the processor is used to execute the program to implement the various steps of the intelligent detection method for defective factors of industrial spraying workpieces based on a graph neural network model.

[0095] Example 3

[0096] The present invention also provides a readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the various steps of the intelligent detection method of defective factors of industrial spraying workpieces based on a graph neural network model are implemented.

[0097] The above are merely preferred embodiments of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. An intelligent detection method for defective factors of industrial spraying workpieces based on a graph neural network model, characterized in that: The following steps are involved: Obtain various parameters during the workpiece production process, including carriage environment parameters, drying room environment parameters, paint quality parameters, and spraying equipment parameters; Each workpiece corresponds to a node, and the feature vector of each workpiece node is constructed based on various parameters in the production process; Aggregating and updating the feature vectors of each workpiece node based on a graph neural network model, and performing high-dimensional feature representation on the updated feature vectors; Based on the high-dimensional features of the workpiece, a back-propagation algorithm is used to optimize the parameters of the graph neural network model; Based on the optimized graph neural network model, the defective factors of the workpiece are predicted and the types of defective factors are output.

2. The intelligent detection method for defective factors of industrial spraying workpieces based on the graph neural network model according to claim 1 is characterized in that: The cabin environmental parameters include cabin humidity, cabin temperature, cabin dust particle size, cabin air pressure, cabin air flow and cabin electrostatic voltage; The drying chamber environmental parameters include drying chamber humidity, drying chamber temperature, drying chamber airflow, drying chamber dust particle size, drying chamber air pressure, drying chamber electrostatic voltage and drying chamber drying time; The paint quality parameters include paint brand, paint production time and paint to thinner ratio; The spraying equipment parameters include spray gun spray pressure, nozzle size, spray angle, spray speed and spray distance.

3. The intelligent detection method for defective factors of industrial spraying workpieces based on a graph neural network model according to claim 1 is characterized in that: The formula for aggregating and updating the feature vector of each workpiece node based on the graph neural network is as follows: in, represents the feature representation of node i at the kth layer, N(i) is the set of neighbor nodes of node i, and W (k) and is the learnable weight matrix, σ is the nonlinear activation function, d i and d j are the degrees of node i and node j respectively.

4. The intelligent detection method for defective factors of industrial spraying workpieces based on a graph neural network model according to claim 1 is characterized in that: Based on the high-dimensional features of the workpiece, the process of optimizing the parameters of the graph neural network model using the backpropagation algorithm includes: The high-dimensional features of the artifacts are fed back to the reverse learning layer to generate a new representation of the original data, which is used to guide the aggregation and update process of the feature vector.

5. The intelligent detection method for defective factors of industrial spraying workpieces based on a graph neural network model according to claim 4 is characterized in that: The formula for guiding the aggregation and updating process of feature vectors based on the new representation is as follows: Where P is the target matrix; s ij is the incidence matrix element; ||·|| F represents the Frobenius norm; S is the auxiliary matrix; is the original data matrix; is a low-dimensional embedding matrix; is the cluster center matrix.

6. The intelligent detection method for defective factors of industrial spraying workpieces based on a graph neural network model according to claim 4 is characterized in that: It also includes feature weight analysis of high-dimensional features to obtain the degree of influence of various parameters on defective product factors.

7. The intelligent detection method for defective factors of industrial spraying workpieces based on a graph neural network model according to claim 1 is characterized in that: The loss function of the graph neural network model is the cross entropy loss function, and the formula is as follows: Among them, y i is the true label, is the predicted value of the model.

8. An electronic device, characterized in that: include: memory and processor; The memory is used to store programs; the processor is used to execute the programs to implement the various steps of the intelligent detection method for defective factors of industrial spraying workpieces based on a graph neural network model as described in any one of claims 1 to 7.

9. A readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, each step of the intelligent detection method for defective factors of industrial spraying workpieces based on a graph neural network model as described in any one of claims 1 to 7 is implemented.

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