Digital assembly manufacturing method of engine self-destruction cartridge

Abstract

The application discloses a kind of digital assembly manufacturing method of engine self-destruction cartridge, comprising the following steps: S1, using optical measuring equipment to measure bonding profile (2);S2, the heterogeneous data of measurement is handled, and the digital three-dimensional model of cartridge profile is established;S3, three-dimensional model data is sent to numerical control bending cutting equipment to realize data-driven physical product production and manufacturing;S4, cartridge is delivered to final assembly workshop assembly site and formally assembled, and the digital manufacturing of the self-destruction cartridge is completed.The application solves the assembly adaptability, assembly reliability and other problems of pyrotechnics in the final assembly link in the field of aerospace, has the characteristics of data-driven, accurate manufacturing, simple operation, high efficiency and economy, and has good popularization and practical value in similar methods, and can produce good economic value after being widely popularized and applied, and has a good reference in the field of spacecraft adaptability assembly, digital assembly coordination.

Description

Technical Field

[0001] This invention belongs to the field of advanced assembly and manufacturing technology in aerospace, and specifically relates to a digital assembly and manufacturing method for engine self-destructing propellant charges. Background Technology

[0002] Engine self-destruction cartridges are an important component of aircraft safety systems. They are mainly used to enable the aircraft engine to self-destruct in the event of a malfunction during flight, preventing the aircraft from falling from a great height or exploding upon impact, thus avoiding significant personal or property damage to the launch site or residents along the flight path.

[0003] The assembly of the engine self-destructing dynamite strips requires the engine to be delivered to the final assembly production site. Based on the shape of the bonding area on the front and rear end caps of the engine, the self-destructing dynamite strips are calibrated, compared, and corrected on-site. After repeatedly confirming that the shape, position, and gap are correct, the excess length is manually marked and cut. Finally, the dynamite strips are bonded and pressure-cured using assembly and pressing fixtures to ensure the precise alignment and connection of multiple dynamite strip segments.

[0004] Currently, the assembly and manufacturing of the self-destructing propellant for this engine still relies on manual operation at the final assembly site. This method is characterized by high personnel experience requirements, high labor intensity, low digitalization, and poor adaptability to assembly boundary conditions. Specifically, this manifests in the following ways: ① Traditional propellant bending method. Operators manually bend the propellant on a workbench, roughly bending the straight sections into the arc shape for engine bonding. Due to the hardness of the propellant material and its inner copper coating, this bending process significantly increases the labor intensity. ② The shape of the propellant bonding area is highly dependent on the actual product. Each time, 2-3 personnel need to work together to place the bent propellant and the actual pressing fixture on the engine bonding area for comparison and calibration. This process requires repeated corrections, causing conflicts and waste of time, manpower, and resources. ③ High requirements for manual experience and time-consuming calibration process. Currently, propellant calibration relies entirely on manual experience, resulting in high labor intensity, high experience requirements, and long processing time. Experienced technicians need at least 3 hours to complete one piece. ④ Low digitalization level. Currently, the entire process of assembling and manufacturing medicine strips is done manually, without corresponding data as a basis for manufacturing, resulting in a high degree of arbitrariness and making it impossible to predict and evaluate quality.

[0005] The assembly and manufacturing of self-destructing propellant cartridges for engines still relies on manual operation at the final assembly site. This method involves traditional cartridge bending techniques, requires highly experienced personnel, is labor-intensive, and has a low degree of digitalization. Therefore, there is an urgent need for a data-driven, digital assembly and manufacturing method. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a method for assembling and manufacturing self-destructing explosive charges for engines based on digital parameters throughout the entire manufacturing process. This method solves problems related to the assembly adaptability and reliability of pyrotechnic components in the aerospace field during the final assembly stage. It features data-driven operation, precise manufacturing, ease of operation, high efficiency, and economy, and possesses significant promotion and practical value compared to similar methods. Its widespread application can generate substantial economic benefits and provides valuable reference for spacecraft adaptive assembly and digital assembly coordination.

[0007] To achieve the above objectives, the present invention employs the following technical solutions:

[0008] A digital assembly and manufacturing method for engine self-destruction propellant cartridges includes the following steps:

[0009] S1. Use optical measuring equipment to measure the bonding surface of the self-destructing explosive strip on the engine head;

[0010] S2. Process the measured heterogeneous data and extract the center line of the shape, convert the data format, and establish a digital three-dimensional model of the drug strip surface.

[0011] S3. The three-dimensional model data is sent to the CNC rolling and cutting equipment to complete the CNC rolling and precision cutting of the self-destructing drug strip, realizing the data-driven physical product manufacturing.

[0012] S4. Deliver the self-destructing strip to the assembly workshop and use crimping fixtures to formally assemble the finished self-destructing strip, thus completing the digital manufacturing of the self-destructing strip.

[0013] Preferably, the method further includes physical morphology inspection of the prepared product in S3, specifically including: placing the strip in an optical inspection device for physical morphology measurement, and automatically detecting and judging the physical data and the original measurement data: when the accuracy is > ±0.2mm, the product is unqualified and is re-bent and cut; when the accuracy is ≤ ±0.2mm, the product is qualified.

[0014] Preferably, in S1, the measurement of the self-destructing strip adhesive surface specifically involves measuring at least 12 points on the outer arc surface of the adhesive surface to construct a spatial curve.

[0015] More preferably, the measurement process includes the construction of a coordinate system VXYZ. The specific steps are as follows: the center point of each docking screw hole on the engine docking plane is taken as the origin O of the coordinate system, the line connecting the origin O and the hole point in quadrant II is the X-axis direction, pointing towards quadrant II is positive; the normal to the docking surface is the Y-axis direction, pointing towards the head is positive; and the Z-axis is established according to the right-hand rule.

[0016] More preferably, in S2, the specific steps for establishing the digital three-dimensional model are as follows:

[0017] S21. Using the detection software in the optical measurement equipment, the measured local area is post-processed to simplify, refine and remove features from the ASC or STL data.

[0018] S22. Using reverse engineering software in optical measurement equipment, the simplified ASC or STL data is repaired and fitted, and the center line and cross section are established respectively for reverse modeling to generate a three-dimensional model.

[0019] S23. Output the 3D model of the medicine strip in formats such as igs and stp.

[0020] Compared with the prior art, the present invention has the following advantages through the above technical solution:

[0021] (1) The entire manufacturing process of the drug strip of the present invention adopts a data-driven manufacturing production mode, which can directly digitize the assembly surface of the engine drug strip and transmit this data between automated equipment, including CNC rolling and cutting equipment and optical inspection equipment, to realize the physical mapping of the digital model, completely change the traditional manufacturing process, and realize a fully digital manufacturing process.

[0022] (2) The present invention uses advanced optical measurement and testing equipment to digitally express and verify key product data, which can achieve high accuracy, high reliability and fast data conversion, and improve the precision and quality of digital manufacturing of products.

[0023] (3) The manufacturing process of this invention realizes automatic bending and cutting of the medicine strips based on measurement data, eliminating the time-consuming and labor-intensive process caused by excessive reliance on manual experience for shaping and cutting; it improves the digitalization level of the product manufacturing process and enhances product production efficiency. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the shape and position of the bonding area of ​​the self-destruct propellant strip for a spacecraft engine according to the present invention;

[0025] Figure 2 This is a schematic diagram of the state in which the drug strip assembly and pressing tool of the present invention presses the drug strip tightly onto the engine;

[0026] Figure 3 This is a schematic diagram of the self-destructing explosive strip of the present invention actually assembled in the engine;

[0027] In the diagram: 1-Engine; 2-Adhesive surface; 3-Mating plane; 4-Crimping tool; 5-Self-destructing strip. Detailed Implementation

[0028] The present invention will now be described in detail with reference to the accompanying drawings.

[0029] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0030] The self-destructing drug strip 5 digital assembly manufacturing mode eliminates the need for on-site calibration, comparison, and correction of physical objects during final assembly. Instead, it constructs a three-dimensional virtual model in digital space through digital measurement and drives the manufacturing of physical products through the mutual conversion and transmission of heterogeneous data.

[0031] A digital assembly and manufacturing method for engine self-destruction propellant cartridges includes the following steps:

[0032] S1, such as Figure 1 As shown, the solid rocket motor 1 of the spacecraft is placed horizontally. The shape 2 of the self-destructing propellant bonding area 2 of the motor 1 is clearly visible on its rear end cap. Using optical measurement equipment, this embodiment uses a laser tracker to measure the shape 2 of the self-destructing propellant bonding area 5 on the horizontally placed end cap of the motor 1. The measurement coordinate system VXYZ is constructed as follows: the center point of each docking screw hole on the docking plane 3 of the motor 1 is the origin O of the coordinate system; the line connecting the origin O and the hole point in quadrant II is the X-axis direction, pointing towards quadrant II as positive; the normal to the docking surface is the Y-axis direction, pointing towards the head as positive; the Z-axis is established according to the right-hand rule. The measurement of the shape 2 of the self-destructing propellant bonding area of ​​the motor 1 specifically involves measuring no less than 12 points on its outer arc surface to construct a spatial curve. The measurement data are shown in Table 1.

[0033] Table 1. Measurement data of the shape of the adhesive area of ​​the drug strip.

[0034]

[0035] S2. Process the measured heterogeneous data and extract the center line of the surface. Convert the data format and establish a digital three-dimensional model of the drug strip surface. Use the cross section of the drug strip as the scanning section and the center line as the scanning trajectory line to establish a three-dimensional model. The cross section of the drug strip is a special-shaped irregular cross section. One side of the drug strip is used to bond to the bonding surface 2. Therefore, the accuracy of measuring this local area (bonding surface) of the engine lays the foundation for the physical manufacturing.

[0036] The specific steps are as follows:

[0037] 1. Using the detection software in the optical measurement equipment, the measured local area is post-processed to simplify, refine, and remove features from the ASC or STL data.

[0038] 2. Using reverse engineering software in optical measurement equipment, the simplified ASC or STL data is repaired and fitted to establish centerlines and cross-sections for reverse modeling and generation of 3D models.

[0039] 3. Output the 3D model of the drug strip in formats such as igs and stp. CNC roll bending and cutting equipment can only recognize igs and stp formats, not ASCII or STL formats, requiring format conversion.

[0040] S3. The 3D model data is transmitted to the CNC rolling and cutting equipment to complete the CNC rolling and precision cutting of the self-destructing strip 5, realizing data-driven physical product manufacturing; the self-destructing strip 5 is placed in the optical inspection equipment for physical morphology measurement, and the physical data and the original measurement data are automatically detected and judged: when the accuracy (sheath tolerance) > ±0.2mm, the product is considered unqualified and should be rolled and cut again; when the accuracy (sheath tolerance) ≤ ±0.2mm, the product is considered qualified.

[0041] S4, such as Figure 2 As shown, the self-destructing strip 5 that meets the accuracy requirements is delivered to the assembly site of the final assembly workshop, and the self-destructing strip 5 is pressed into the bonding area 2 of the engine self-destructing strip using the assembly and pressing tool 4, so that the gap between the self-destructing strip 5 and the engine 1 is no more than 5mm.

[0042] The crimping fixture consists of several fixing bolts, connecting blocks, and clamping blocks. Its purpose is to ensure that the propellant strip is firmly bonded to the engine surface and does not fall off. The main reasons for detachment are mismatch between the propellant strip and the surface (accuracy mentioned in the text) and improper use of the crimping fixture. Operating steps: 1. Tighten each fixing bolt of the crimping fixture to the bolt holes on the engine mating plane 3; 2. Adjust the clamping blocks at one end of each connecting block to cover the propellant strip bonding position; 3. Press the clamping blocks against the normal direction of the propellant strip bonding surface, ensuring that each clamping block is perpendicularly and firmly pressed without slippage.

[0043] like Figure 3 As shown, the self-destructing explosive strip 5, after digital assembly and manufacturing, can be precisely assembled onto the engine head 1, completing the digital manufacturing of this type of self-destructing explosive strip 5.

[0044] The method of this invention utilizes optical measurement—laser, not visual measurement; it primarily employs a 3D scanner or laser tracker, and is not limited to contact or non-contact measurement methods. The entire manufacturing process is completed through data transmission, constituting a digital manufacturing model, which differs from the traditional assembly method that relies on manual bending to manufacture the cartridge and repeated comparison and correction on the engine's surface.

[0045] This invention utilizes digital measurement and assembly inspection technology to optically measure the bonding surface of engine self-destructing propellant strips, establishing a digital model of propellant strip bending based on the measurement data. This measurement data model is then used as the basis for CNC bending manufacturing of the propellant strips throughout the entire process. Finally, digital inspection methods are used to compare the physical model of the propellant strip with the original measurement data model. Propellant strips that meet the requirements are directly delivered for assembly, ultimately realizing the digital manufacturing of engine self-destructing propellant strips, greatly improving the production efficiency of the final assembly workshop, and achieving data-driven production of the product.

[0046] This invention is not limited to the specific embodiments described above. The invention extends to any new feature or combination disclosed in this specification, as well as any new method or process step or combination disclosed herein.

Claims

1. A digital assembly and manufacturing method for engine self-destructing propellant strips, characterized in that, Includes the following steps: S1. Use optical measuring equipment to measure the bonding surface (2) on the engine (1); before measurement, it also includes constructing a coordinate system VXYZ. The specific steps are as follows: take the center point of each docking screw hole on the docking plane (3) of the engine (1) as the origin O of the coordinate system, the line connecting the origin O and the hole point in the II quadrant is the X-axis direction, pointing to the II quadrant is positive; the normal of the docking surface is the Y-axis direction, pointing to the head is positive; establish the Z-axis according to the right-hand rule; then measure no less than 12 points on the outer arc surface of the bonding surface (2) to construct a space curve; S2. Process the measured heterogeneous data and extract the center line of the surface. Use the cross-section of the drug strip as the scanning section and the center line as the scanning trajectory to build a three-dimensional model. Convert the data format to build a digital three-dimensional model of the drug strip surface. The specific steps for building the digital three-dimensional model are as follows: S21. Using the detection software in the optical measurement equipment, the measured local area is post-processed to simplify, refine and remove features from the ASC or STL data. S22. Using reverse engineering software in optical measurement equipment, the simplified ASC or STL data is repaired and fitted, and the center line and cross section are established respectively for reverse modeling to generate a three-dimensional model. S23. Output the 3D model of the medicine strip as igs, stp, or other formats. S3. The three-dimensional model data is sent to the CNC rolling and cutting equipment to complete the CNC rolling and precise cutting of the self-destructing drug strip (5) in succession, so as to realize the data-driven physical product manufacturing. S4. Deliver the self-destructing strip (5) to the assembly site of the final assembly workshop, and use the crimping tool (4) to formally assemble the finished self-destructing strip (5) to complete the digital manufacturing of the self-destructing strip (5).

2. The digital assembly and manufacturing method for engine self-destructing propellant strips according to claim 1, characterized in that, It also includes the physical morphology inspection of the S3 preparation, specifically including: placing the self-destructing strip (5) in an optical inspection device to measure the physical morphology, and automatically detecting and judging the physical data and the original measurement data: when the accuracy is > ±0.2mm, the product is unqualified and is re-rolled and cut; when the accuracy is ≤ ±0.2mm, the product is qualified.

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