Packaging method for composite materials with complex curved surfaces

Abstract

The present invention provides a method for packaging a composite material part with a complex curved surface, and belongs to the technical field of composite material processing and molding. The present invention can quickly realize the packaging of composite materials, and ensure the accuracy of auxiliary materials on the blank during the packaging process, greatly improve the packaging quality, increase labor productivity, and reduce the labor intensity of workers. More importantly, this method improves the material utilization rate of process auxiliary materials and reduces manufacturing costs.

Description

Technical Field

[0001] The invention belongs to the technical field of composite material processing and forming, and relates to a method for improving the packaging quality and packaging efficiency of a composite material part with a complex curved surface. Background Art

[0002] When packaging composite parts, various process auxiliary materials are needed, such as breathable felt, isolation film and demoulding cloth. These process auxiliary materials laid on the composite blank need to fit closely with the blank, without wrinkles and bridges, otherwise uneven pressure during curing will cause poor local internal quality, uneven surface of the part after curing, and even affect the external dimensions of the part. However, for some composite parts with complex curved surfaces, manual cutting of process auxiliary materials is usually adopted during packaging, and rough cutting is performed along the shape, curvature and position relationship of the part surface. This method of manual cutting of process auxiliary materials can still meet the requirements when the packaging stack is in an approximately flat state. For parts with large curvature and complex structure, it cannot guarantee that the process auxiliary materials used for packaging are completely fitted with the surface of the part, and local auxiliary materials are often stacked and wrinkled. At the same time, due to the poor dimensional and external accuracy during cutting, the local packaging effect cannot be 100%, and there is a risk of vacuum bag breakdown during curing. More importantly, this method is quite arbitrary and there is no fixed method for cutting, which results in low material utilization and great waste of process auxiliary materials. Summary of the invention

[0003] The purpose of the present invention is to provide a method and idea for solving the problems of poor packaging quality, low packaging efficiency and low utilization rate of process auxiliary materials for composite parts with complex outer shapes. The present invention can effectively solve the problems of local non-fitting and wrinkling caused by laying two-dimensional process auxiliary material pieces on three-dimensional curved surfaces during the packaging process of composite parts with complex curved surfaces, greatly improve the work efficiency of packaging under the existing level, and at the same time improve the material utilization rate of process auxiliary materials, reduce manufacturing costs and avoid waste. The present invention is applicable to the requirements of surface packaging of various complex composite materials, and while ensuring the accuracy of the size of the process auxiliary material pieces, the packaging effect meets the engineering requirements.

[0004] The objective of the present invention is achieved through the following technical solutions:

[0005] A method for packaging a complex curved composite material part comprises the following steps:

[0006] 1) Collect digital model data of the surface of complex curved composite parts to be packaged;

[0007] 2) Analyze the 3D model data, divide the 3D model data to be packaged into the stringer area and the skin area, and obtain surface data information of several parts, including the type, size and curvature of the model;

[0008] 3) Expand the three-dimensional model data to obtain two-dimensional data;

[0009] 4) The process auxiliary materials are laid out and cut on an automatic blanking machine according to the obtained two-dimensional data;

[0010] 5) Verify the packaging effect and push back the actual data to form a database to improve the accuracy of subsequent packaging.

[0011] In the step 1), the three-dimensional external surface digital model information of the complex curved composite material part to be packaged is collected, and only the surface layer data needs to be extracted. At the same time, the surface area of ​​the part is obtained and recorded as S 理论 The outer contour of the workpiece is defined as L 外 However, since the entire size of the part must be covered during packaging, it is usually necessary to extend the distance D along the same curvature direction at the edge of the part. Therefore, the total area S that needs to be processed is obtained 总 ,Right now:

[0012] S 总 =S 理论 +L 外 ×D (1)

[0013] In the formula, D is usually selected as 10-15cm.

[0014] In step 2), press S 总 The area parsing 3D model data to be packaged is segmented according to the stringer area and the skin area, or according to the large curvature area and the small curvature area and some characteristic structure areas, and n sample sets {θ1,θ2,…,θ n}, θ is the feature information that affects the area after segmentation. The following conditions must be met after segmentation, namely:

[0015]

[0016] In the formula, S i (θ) is the area of ​​each shape obtained after segmentation, i = 1, 2, ..., n; Y i is a weighting factor, usually 1 is selected, but it can be adjusted according to the subsequent verification results to meet the quality requirements. The data information of several digital models after segmentation is saved, and a comparison table of the relationship between the n shape names and the overall spatial position after segmentation is established.

[0017] The step 3) is based on the parsed data and is processed by relying on the parameters in the database. The parameter setting values ​​are selected according to the built-in parameters. The origin P position usually selects the feature point, and the three-dimensional model data is expanded to obtain two-dimensional data.

[0018] In the step 4), the process auxiliary materials are laid out and cut on an automatic blanking machine according to the obtained two-dimensional data; in order to display the position of the origin on each sheet, the letters and numbers marking the sheet information are selected to be ≤5 cm around the origin P.

[0019] The step 5) verifies the packaging effect and pushes back the result data. The weighting factor Y i It can be realized, a database is formed, and the accuracy of subsequent packaging is improved.

[0020] Beneficial effects of the invention: Compared with the prior art, the method provided by the invention for improving the quality and efficiency of composite material packaging can quickly realize the packaging of composite materials and ensure the accuracy of auxiliary materials on the blank during the packaging process, greatly improving the packaging quality, improving labor productivity, and reducing the labor intensity of workers. More importantly, this method improves the material utilization rate of process auxiliary materials and reduces manufacturing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the combination of heterogeneous reinforced parts.

[0022] Figure 2 This is a schematic diagram of the placement of auxiliary materials for the feeding machine.

[0023] In the figure: 1 the two-dimensional shape of the three-dimensional curvature skin of the surface to be packaged after unfolding; 2 the two-dimensional shape of the three-dimensional curvature skin of the surface to be packaged after unfolding; 3 the two-dimensional shape of the three-dimensional curvature long stringer of the surface to be packaged after unfolding; 4 the size of the two-dimensional cutting piece after unfolding; 5 the table top of the unloading platform. DETAILED DESCRIPTION

[0024] The specific implementation of the present invention is further explained below in conjunction with the examples and drawings, but is not intended to limit the present invention.

[0025] A packaging method for a complex curved composite material part, the specific implementation steps are as follows:

[0026] Step 1): Based on the surface of the composite part to be packaged, extract the surface area curves and edges of the composite material through 3D modeling software (such as CATIA), collect the 3D external surface digital model information of the composite part to be packaged, and only need to extract the surface layer data. However, since the entire size of the part must be covered during packaging, it is usually necessary to extend the edge of the part along the same curvature direction by 10-15cm. Process according to formula (1). In order to improve data quality and calculation difficulty, the data can also be cleaned and filtered, that is, the noise data that affects the results is effectively removed to obtain a relatively clean data sample.

[0027] Step 2): Parse the 3D model data and store it in a fixed path, so that the program can execute batch processing commands in the specified folder. Use CAA technology to obtain the drawing number, name, category, outline size, curvature, etc. of the 3D part model. n The data format of the part outline dimensions in} is L (length) * J (width) * H (height), which needs to be further parsed to structure the length, width, and height of the part and store them discretely in the database. A comparison table of part names and part categories is established, as shown in Table 1. The part category is obtained according to the part name and combined with the data in step 1 to form a basic database, as shown in Table 2.

[0028] Table 1 Simulation parameter setting table Unit: mm

[0029]

[0030] Table 2 Basic database unit: mm

[0031]

[0032] The step 2) parses the three-dimensional model data, divides the three-dimensional model data to be packaged according to the long stringer area and the skin area, or divides it according to the large curvature area and the small curvature area and some characteristic structure areas, and obtains the new three-dimensional model including the name, outline size, curvature, category, etc. The name can be numbered (for example, 1-999) to distinguish the difference between each shape, which is convenient for subsequent expansion operations and placement operations during packaging; the data form of the outline size is L (length) * J (width) * H (height), and the length, width, and height of the part are structured separately. The data information of several digital models that have been segmented is saved, and a comparison table of the relationship between the segmented name and the overall spatial position is established.

[0033] Step 3): By parsing the three-dimensional data, the multiple data obtained after segmentation are analyzed and simulated using digital design and manufacturing software (such as FiberSIM, CPD). Taking the C-type structure data as an example, as shown in Table 1, the extracted regional surface and edge line are selected as the priority simulation area, and the two-dimensional expansion diagram of the three-dimensional digital model is obtained according to the origin provided by the software and the appropriate simulation method and simulation factor. Since there is no internal direction problem involved, there is no need to fit in the horizontal direction, and the shape can be obtained. Figure 1 1, 2 and 3 show the three-dimensional curvature skin of the surface to be packaged and the two-dimensional shape of the long stringer after unfolding.

[0034] Step 4): layout and cut the process auxiliary materials on the automatic blanking machine according to the obtained two-dimensional data; Figure 2As shown, 4 is the size of the two-dimensional cut piece after unfolding, and 5 is the table of the unloading platform. The three-dimensional structure with complex curvature is divided into two-dimensional materials, which are arranged on the unloading platform according to the built-in program of the unloading machine for unloading operation. The material utilization rate of process auxiliary materials can be controlled to the greatest extent to avoid waste.

[0035] Step 5): The above-mentioned auxiliary materials with numbers or letters are packaged and assembled according to the process requirements and spatial position information. During packaging, the process is strictly carried out in order, and the gap and overlap amount are verified at the joint or overlap area to see if they meet the packaging requirements. For those that do not meet the requirements, records are made and the result data is sent back to the inference simulation operation to re-calculate the material's external dimensions by adjusting the weighting factor Y i At the same time, each simulation result is processed according to the above steps, and then improved and updated to the basic database table 2. The newly formed data samples will help to optimize the subsequent reasoning operations.

Claims

1. A method for packaging a complex curved composite material part, characterized in that: The method comprises the following steps: 1) Collect digital model data of the surface of complex curved composite parts to be packaged; 2) parsing the 3D model data, dividing the 3D model data to be packaged according to the stringer area and the skin area, and obtaining surface data information of several parts, including the type, size and curvature of the model; 3) Expand the three-dimensional model data to obtain two-dimensional data; 4) The process auxiliary materials are laid out and cut on an automatic blanking machine according to the obtained two-dimensional data; 5) Verify the packaging effect and push back the actual data to form a database to improve the accuracy of subsequent packaging; in, In the step 1), the three-dimensional external surface digital model information of the complex curved composite material part to be packaged is collected, and only the data of the surface layer needs to be extracted; at the same time, the surface area of ​​the part is obtained and recorded as S 理论 The outer contour of the workpiece is defined as L 外 However, since the entire size of the part must be covered during packaging, the distance D needs to be extended along the same curvature direction at the edge of the part; therefore, the total area S that needs to be processed is obtained. 总 ,Right now: S 总 =S 理论 +L 外 ×D (1) In the formula, D is selected as 10-15cm; In step 2), press S 总 The area parsing 3D model data to be packaged is segmented according to the stringer area and the skin area, or according to the large curvature area and the small curvature area and some characteristic structure areas, and n sample sets {θ1,θ2,…,θ n }, θ is the feature information that affects the area after segmentation. The following conditions must be met after segmentation, namely: In the formula, S i (θ) is the area of ​​each shape obtained after segmentation, i = 1, 2, ..., n; Y i is a weighting factor; the data information of several digital models after segmentation is saved, and a comparison table of the relationship between the n shape names and the overall spatial positions after segmentation is established.

2. The method for packaging a complex curved composite material component according to claim 1, characterized in that: The step 3) is based on the analyzed data and is processed by relying on the parameters in the database. The parameter setting values ​​are selected according to the built-in parameters, the feature points are selected at the origin P position, and the three-dimensional model data is expanded to obtain two-dimensional data.

3. The packaging method for a complex curved composite material part according to claim 1, characterized in that: The step 3) is based on the analyzed data and is processed by relying on the parameters in the database. The parameter setting values ​​are selected according to the built-in parameters, the feature points are selected at the origin P position, and the three-dimensional model data is expanded to obtain two-dimensional data.

4. A method for packaging a complex curved composite material component according to claim 1 or 3, characterized in that: In the step 4), the process auxiliary materials are typeset and cut on an automatic blanking machine according to the obtained two-dimensional data; in order to display the position of the origin on each sheet, the letters and numbers marking the sheet information are selected to be ≤5 cm around the origin P.

5. The method for packaging a complex curved composite material component according to claim 1, characterized in that: In the step 4), the process auxiliary materials are typeset and cut on an automatic blanking machine according to the obtained two-dimensional data; in order to display the position of the origin on each sheet, the letters and numbers marking the sheet information are selected to be ≤5 cm around the origin P.

6. The method for packaging a complex curved composite material component according to claim 2, characterized in that: In the step 4), the process auxiliary materials are typeset and cut on an automatic blanking machine according to the obtained two-dimensional data; in order to display the position of the origin on each sheet, the letters and numbers marking the sheet information are selected to be ≤5 cm around the origin P.

7. A method for packaging a complex curved composite material component according to claim 1, 3, 5 or 6, characterized in that: The step 5) verifies the packaging effect, pushes back the result data, and modifies the weighting factor Y i It can be realized, a database is formed, and the accuracy of subsequent packaging is improved.

Images