A method of laying up a large size cylindrical honeycomb sandwich part

Abstract

The application discloses a kind of large-size cylindrical honeycomb sandwich piece's sheet laying method, comprising the following steps: 1) establish the space coordinate system relative to part and arrange multiple auxiliary board surfaces around part, each auxiliary board surface is equipped with several positioning targets, the position data of positioning target on auxiliary board surface is captured from multiple angles by using visual measurement equipment to scan around multiple auxiliary board surfaces, to establish the space coordinate system relative to part;2) obtain the laying reference line and laying reference point of part model, carry out layer design to it, obtain blanking drawing containing laying reference point, prepare corresponding sample based on blanking drawing.The laying method provided by the application does not depend on special sheet positioning tooling, so the manufacturing cost can be reduced and the manufacturing cycle can be shortened, the three-dimensional coordinates of the coordinate system and the reference point are obtained, without customizing complex positioning tooling, so the cost and time can be greatly saved.

Description

TECHNICAL FIELD

[0001] The present application relates to a method for laying up a large-size cylindrical honeycomb sandwich part. BACKGROUND

[0002] The air engine inlet duct is mostly a large-size cylindrical honeycomb sandwich part, and its production process involves a key step of laying up and positioning. The current laying up and positioning mainly relies on a laser projector and special tooling auxiliary tools. However, these auxiliary tools are not perfect. The laser projector is suitable for laying up a large and complex skin, but for laying up some large-size special complex-shaped parts, the effect is limited by the projection angle of the laser, and the projection angle may not cover or the projection area may have a large deviation from the theoretical area. On the other hand, although the special layup positioning tool has positioning advantages, it has high manufacturing cost and long manufacturing cycle. Therefore, there is an urgent need to find a new laying up and positioning method to solve the problems of the large-size cylindrical honeycomb sandwich part in the laying up and positioning process. SUMMARY

[0003] The main purpose of the present application is to provide a method for laying up a large-size cylindrical honeycomb sandwich part to solve the above technical problems.

[0004] The purpose of the present application can be achieved by adopting the following technical scheme:

[0005] A method for laying up a large-size cylindrical honeycomb sandwich part, comprising the following steps:

[0006] 1) Establishing a space coordinate system relative to the part

[0007] A plurality of auxiliary plate surfaces are arranged around the part, a plurality of positioning targets are arranged on each auxiliary plate surface, a vision measurement device is used to scan around the plurality of auxiliary plate surfaces, the position data of the positioning targets on the auxiliary plate surfaces are captured from multiple angles to establish a space coordinate system relative to the part;

[0008] 2) Obtaining a laying up reference line and a laying up reference point of a part model, designing a layup layer, obtaining a blanking drawing containing the laying up reference point, and preparing a corresponding template based on the blanking drawing;

[0009] 3) Obtaining three-dimensional coordinates of the laying up reference point by using the template and the vision measurement device

[0010] The template prepared in step 2) is fixed on the part, then the three-dimensional coordinates of the laying up reference point in the space coordinate system established in step 1) are obtained by using the vision measurement device through the laying up reference point on the template, and the three-dimensional coordinates are saved. In this process, the laying up reference point on the template corresponds to the laying up reference point of the part one by one;

[0011] 4) positioning the laying reference point of the part and the three-dimensional coordinate point overlap in the spatial coordinate system, and laying the sheet based on the reference point

[0012] Finding the laying reference point of the part and the saved three-dimensional coordinate overlap by matching the visual measurement device with the part, and making corresponding marks;

[0013] Laying based on the coincidence of the sheet laying reference point and the mark.

[0014] Preferably, a plurality of said auxiliary panels are annularly arranged around the part, and the positioning target on the auxiliary panel is located on the outer side of the auxiliary panel relative to the part.

[0015] Preferably, in step 1), the visual measurement device is moved uniformly along the ring direction to find the best position of the visual measurement device and establish the spatial coordinate system of the part.

[0016] Preferably, the difference between the height of the auxiliary panel and the height of the laser scanner is within a predetermined range, and the predetermined range allows the laser scanner to view the auxiliary panel horizontally.

[0017] Preferably, the laser scanner is a handheld laser scanner.

[0018] Preferably, each said auxiliary panel is kept at a distance within a predetermined range from the part.

[0019] Preferably, the laser scanner lays the sheet after scanning each region of the part.

[0020] The beneficial technical effects of the present application are:

[0021] 1. The laying method provided by the present application can establish an accurate spatial coordinate system on the part by using a visual measurement device, and obtain the three-dimensional coordinates of the laying reference point by using a template and a scanner, which can realize accurate positioning and laying. This has a significant advantage for laying large-sized and special complex-shaped parts.

[0022] 2. The laying method provided by the present application no longer relies on the projection of a laser projector, thus eliminating problems such as the inability of the projection angle to cover or the projection area to have a large deviation from the theoretical area. Instead, a laser scanner is used to find and calibrate the laying reference point on the actual surface of the part, which avoids projection deviation during the laying of complex-shaped parts.

[0023] 3. The laying method provided by the present application does not rely on a special sheet positioning tool, thus reducing manufacturing costs and shortening the manufacturing cycle. Establishing the coordinate system and obtaining the three-dimensional coordinates of the reference point does not require customizing a complex positioning tool, thus greatly saving costs and time. BRIEF DESCRIPTION OF DRAWINGS

[0024] Fig. 1 Positioning state schematic diagram for laying according to the embodiment of the present application;

[0025] Fig. 2 Process schematic diagram for laying method according to the embodiment of the present application.

[0026] In the figure: 1-laser scanner, 2-assistant plate surface, 3-laser scanner station, 4-template, 5-laying reference point, 6-laser scanner scanning head, 7-large-size cylindrical honeycomb sandwich part, 8-positioning target. DETAILED DESCRIPTION

[0027] In order to make the technical solution of the present application more clear and explicit to those skilled in the art, the present application will be further described in detail below in combination with embodiments and drawings, but the embodiments of the present application are not limited thereto.

[0028] As shown in the figure, the sheet laying method for large-size cylindrical honeycomb sandwich part provided by the present embodiment comprises the following steps: Figs. 1-2

[0029] 1) Establish the spatial coordinate system relative to the part (large-size cylindrical honeycomb sandwich part 7) by scanning on the assistant plate surface 2 with a height approximately equal to the laser scanner using the laser scanner 1;

[0030] Uniformly arrange multiple assistant plate surfaces 2 around the part, and each of the assistant plate surfaces 2 is pasted with multiple positioning targets 8 (the positioning targets 8 are located on the outer side of the assistant plate surface 2 relative to the part, so as to avoid the laser scanner from scanning out and affecting the establishment of the subsequent coordinate system), and the laser scanner 1 is used to scan around the multiple assistant plate surfaces to capture the position data of the positioning targets on the assistant plate surfaces from multiple angles, so as to establish the spatial coordinate system relative to the part;

[0031] During the scanning process, the laser scanner obtains the spatial coordinates of the positioning targets by scanning the positioning targets on each assistant plate surface, and these spatial coordinates of the positioning targets are used to establish the spatial coordinate system of the part, that is, the spatial coordinates of the positioning targets provide a reference for the laser scanner, so that the laser scanner can be accurately positioned in the spatial coordinate system of the part;

[0032] The use of the positioning targets avoids scanning without a fixed reference point, thereby greatly improving the accuracy and efficiency of the scanning, which is very crucial for the subsequent steps, such as the making of the laying reference point and the laying of the sheet;

[0033] During the scanning process, the laser scanner 1 needs to be moved uniformly (around the area formed by the multiple assistant plate surfaces 2) to find the best station of the laser scanner and establish the spatial coordinate system of the part;​

[0034] In the scanning process, the positioning target is scanned from different angles, and the information of the positioning target in different directions in space can be obtained. Through the information, the accurate position of the positioning target in space can be determined. Therefore, the auxiliary plate 2 is scanned from different angles, and the spatial information of the positioning target can be obtained from each angle, so that a comprehensive and accurate spatial coordinate system is established.

[0035] In addition, the diversity of scanning angles can eliminate the deviation or error that may be caused by single-angle scanning, so that the established spatial coordinate system is more accurate. In this spatial coordinate system, the subsequent reference point acquisition and tile laying tasks are more accurately performed, thereby improving the accuracy of the laying and positioning.

[0036] This step is to make the subsequent reference point acquisition and tile laying in a clear and accurate spatial reference system, thereby improving the accuracy of the laying and positioning.

[0037] 2) Obtain the laying reference line and laying reference point of the part model, design the layup, obtain the cutting drawing containing the laying reference point, and prepare the corresponding template 4 based on the cutting drawing;

[0038] The laying reference line and laying reference point of the part model are extracted in CATIA, and the layup is designed using Fibersim. The cutting drawing containing the laying reference point is prepared, and the corresponding template is cut out according to the cutting drawing using a cloth cutting machine.

[0039] In the layup design, the laying reference line is first determined according to the angle of the layup, then the laying sequence of each layer is determined, and finally the cutting drawing is generated according to the information.

[0040] When the cutting drawing is generated, the laying reference points are usually marked on the drawing. These points will be used to obtain three-dimensional coordinates and serve as a reference for accurate laying in subsequent steps. Although the subsequent steps mainly operate according to the laying reference points, the angle of the layup needs to be confirmed through the laying reference line. Therefore, the laying reference line plays an important role in the entire process.

[0041] This step provides accurate templates and laying references for subsequent laying reference point manufacturing and tile laying, thereby improving the accuracy and efficiency of the laying.

[0042] 3) Obtain the three-dimensional coordinates of the laying reference points using the template and the laser scanner.

[0043] The template prepared in step 2) is fixed on the part by a pressure-sensitive tape, and then the laser scanner scanning head 6 obtains the three-dimensional coordinates of the laying reference points on the template in the spatial coordinate system established in step 1) by touching the laying reference points, and saves the three-dimensional coordinates. In this process, the laying reference points on the template correspond one by one to the laying reference points on the part after the template and the part are fixed together by the pressure-sensitive tape;

[0044] This step is realized by accurate three-dimensional coordinate acquisition, so that the subsequent laying of the patch can be more accurately performed according to the laying reference points, thereby further improving the laying accuracy;

[0045] 4) The laying reference points of the part and the three-dimensional coordinate points are positioned in the spatial coordinate system, and the laying of the patch is performed based on the laying reference points;

[0046] The three-dimensional coordinates in step 3) are called out in the spatial coordinate system in step 1), and the laser scanner scanning head 6 is used to gently touch the part to find the laying reference points that can overlap with the saved three-dimensional coordinates and make corresponding marks, so that the laying of the patch is performed based on the coincidence of the laying reference points of the patch and the marks as the reference;

[0047] This step realizes accurate positioning and marking, so that the laying of the patch is more accurate, thereby improving the overall laying quality.

[0048] In this embodiment, the laser scanner is a handheld laser scanner, and the distance between each auxiliary plate surface and the part is kept substantially constant. The laser scanner needs to establish a spatial coordinate system relative to the part by scanning the positioning targets on the auxiliary plate surface. If the distance between the auxiliary plate surface and the part changes too much, the stability of the established spatial coordinate system may be reduced, which may affect the accuracy of subsequent reference point acquisition and patch laying.

[0049] In this embodiment, the laser scanner lays the patch after scanning each area of the reinforcement layer, i.e., the local reinforcement layer in addition to the overall reinforcement layer. Specifically, after scanning and marking each area of the reinforcement layer, the corresponding patch is laid. In this way, each area of the reinforcement layer can be accurately laid according to the design requirements, thereby improving the overall laying quality.

[0050] In this embodiment, the reason for using the laser scanner to scan the auxiliary plate surface 2 with a height approximately equal to that of the laser scanner in step 1) is that:

[0051] In this way, the laser scanner can "see" the target as much as possible at a nearly horizontal angle during scanning. At this angle, the scanning device can capture the overall appearance and details of the target more comprehensively and accurately, reducing scanning distortion caused by the angle of view.

[0052] The height difference between the laser scanner and the auxiliary plate surface is not greater than 4 cm.

[0053] In this embodiment, in step 1), the optimal station of the laser scanner is found and determined, and the spatial coordinate system of the part is established, which is a continuous process. During the scanning process, the laser scanner is moving and scanning, and at the same time, the optimal station is being found. These operations are carried out in parallel, that is, the optimal station of the laser scanner is adjusted and determined in real time during the scanning and moving process, and in this process, the spatial coordinate system is gradually established. The optimal station refers to the station at which the scanner can obtain the maximum information of the target (here, the auxiliary plate surface 2 and the positioning target), while avoiding or reducing the existence of scanning errors or dead angles.

[0054] Therefore, finding and determining the optimal station of the laser scanner plays a key role in obtaining high-quality scanning data and accurately establishing the spatial coordinate system, which is also to ensure the accuracy of subsequent steps such as reference point acquisition and sheet laying.

[0055] The layer design in step 2) is mainly for the part reinforcement layer, which is a component of the large-size cylindrical honeycomb sandwich part. In order to ensure that the part can withstand greater stress or torque during use, reinforcement layers will be added at key positions of the part (such as positions with the maximum stress or deformation). The layer design is mainly for the part reinforcement layer, and the main reasons are as follows:

[0056] Firstly, the part reinforcement layer is a key component of the part, and its design directly affects the performance of the part. Therefore, careful layer design can make the part meet the strength and stiffness requirements while minimizing the weight of the part.

[0057] Secondly, the layer design of the reinforcement layer is more complex than other parts because it needs to consider more factors, such as the connection method of the reinforcement layer with other parts, the shape and size of the reinforcement layer, the position of the reinforcement layer, etc. Therefore, this part requires more professional and detailed layer design.

[0058] In this embodiment, the spatial coordinate system relative to the part is established on the auxiliary plate surface by the laser scanner, which helps to more accurately determine the position of the laying reference line and reference point, thereby improving the accuracy of the laying positioning.

[0059] The three-dimensional coordinates of the laying reference point are obtained using the template and the laser scanner, which makes the positioning more accurate and improves the quality of the sheet laying.

[0060] The laser scanner finds and marks the laying reference point that can overlap with the saved three-dimensional coordinate point, and then laying is performed based on the reference point, which not only improves the laying precision, but also simplifies the work flow and improves the efficiency.

[0061] In the embodiment, the laser scanner is used for spatial positioning and reference point acquisition, so that the laying positioning of the large-size cylindrical honeycomb sandwich part is more accurate and convenient, and in addition, the method also solves the problems of high cost and long manufacturing cycle of the special sheet positioning tooling, so as to possibly reduce the production cost and improve the production efficiency.

[0062] In the embodiment, the spatial coordinate system established by the laser scanner provides a spatial reference for subsequent laying work, the sample preparation provides a laying reference line and a laying reference point, the laying reference point is made according to the sample and the laser scanner to obtain a more accurate reference point position, and the sheet laying is performed based on the reference obtained in the foregoing steps, so that the laying process is more accurate and efficient, and the whole process is like an assembly line, each step provides necessary information or reference for the subsequent step, and the coherence and accuracy of the whole work flow are ensured.

[0063] In the embodiment, in step 4), the scanning head of the laser scanner touches the part mainly for accurate physical positioning, when the scanning head contacts the surface of the part, the laser scanner can determine the actual position of the laying reference point on the part by reading the position information of the contact point;

[0064] Specifically, in step 3), the three-dimensional coordinates of the laying reference point on the sample in the spatial coordinate system are obtained by the scanning head of the laser scanner touching the laying reference point on the sample and saved, and then in step 4), the scanning head of the laser scanner is used to gently touch the part, and according to the spatial coordinate system established in step 1) and the three-dimensional coordinates obtained in step 3), the laying reference point overlapping with the three-dimensional coordinate point on the part is found;

[0065] In the physical touching process, the scanning head can obtain and read the position information of the surface of the part in real time, and the information is compared with the saved three-dimensional coordinates to find the laying reference point overlapping with the three-dimensional coordinates, so that the laying reference point can be accurately found in the sheet laying process, and the precision and efficiency of the sheet laying are improved;

[0066] Here, the laser scanner mainly finds and calibrates the position on the part corresponding to the laying reference point on the sample in the space to realize accurate laying.

[0067] To sum up, in the embodiment, the laying method provided by the embodiment can realize accurate positioning and laying by using a visual measuring device to establish an accurate space coordinate system on the part and using a template and a scanner to obtain three-dimensional coordinates of laying reference points, which has a significant advantage for laying of large-size special complex-shaped parts.

[0068] The above merely describes further embodiments of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can make equivalent replacements or changes to the technical solutions and concepts of the present application within the scope disclosed by the present application, and such replacements or changes shall also fall within the protection scope of the present application.

Claims

1. A method for laying sheet materials for a large-size cylindrical honeycomb sandwich component, characterized in that, Includes the following steps: 1) Establish a spatial coordinate system relative to the part Multiple auxiliary plates are arranged around the part, and each auxiliary plate is equipped with several positioning targets. A laser scanner is used to scan around the multiple auxiliary plates to capture the position data of the positioning targets on the auxiliary plates from multiple angles in order to establish a spatial coordinate system relative to the part. The auxiliary plates are arranged in a ring around the part, and the positioning targets on the auxiliary plates are located on the outer side of the auxiliary plates relative to the part. The difference between the height of the auxiliary panel and the height of the laser scanner is within a preset range, which allows the laser scanner to view the auxiliary panel at eye level. 2) Obtain the layup baseline and layup reference points of the part model, perform layup design, obtain the blanking drawing containing the layup reference points, and prepare the corresponding template based on the blanking drawing; 3) Obtain the three-dimensional coordinates of the paving reference points using templates and laser scanners. Fix the template prepared in step 2) onto the part, and then use a laser scanner to obtain the three-dimensional coordinates of the template in the spatial coordinate system established in step 1) through the template's paving reference point, and save it. During this process, the paving reference point on the template corresponds one-to-one with the paving reference point of the part. 4) Locate the reference point for the part to overlap with the three-dimensional coordinate points in the spatial coordinate system, and use this reference point to lay the material sheet. By using a laser scanner in conjunction with the part, the tiling reference points where the part overlaps with the saved 3D coordinates are identified and marked accordingly; The paving material is laid with the reference point and the mark coinciding as the reference.

2. The method for laying sheet materials of a large-size cylindrical honeycomb sandwich component according to claim 1, characterized in that, In step 1), the laser scanner is moved uniformly along the circumference to find and determine the optimal position of the laser scanner and establish the spatial coordinate system of the part.

3. The method for laying sheet materials of a large-size cylindrical honeycomb sandwich component according to claim 1, characterized in that, The laser scanner is a handheld laser scanner.

4. The method for laying sheet materials of a large-size cylindrical honeycomb sandwich component according to claim 1, characterized in that, Each of the aforementioned auxiliary plates maintains the same preset distance from the parts.

5. The method for laying sheet materials of a large-size cylindrical honeycomb sandwich component according to claim 1, characterized in that, After the laser scanner scans one area of ​​the reinforcing layer of the part, the material sheet is laid out.

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