The manufacturing of aerospace skin and other parts is mostly single-piece and small batches. After the design process is completed, it is often necessary to design a fixture system that is designed by the process fixture design department to be able to manufacture. Usually, a model (aerospace vehicle) fixture is used. The design cycle will be accompanied by the entire manufacturing cycle. The manufacture of a part usually requires multiple sets of fixture systems to complete the entire manufacturing process. This paper focuses on the principles and implementation methods of the fixtureless manufacturing system in the manufacturing of aerospace components and parts. CNC Machine Tool Online Quality Control Technology . At the same time, the process and the intelligent clamping process for the manufacture of other aerospace parts and components are improved, and the process quality control (OMV) of numerical control processing is also applied.
The skin materials are usually high-strength aluminum alloys, carbon fiber-reinforced aluminum alloy composites, and other composite materials. The molding process is often used with drawing, drawing and bending techniques, composite material mold coating forming process, and a wide range of suitable form accuracy. At the same time, due to its thin-walled form, the entire part shape is a flexible form, which makes it difficult to install the card, and it also has features such as cutting of material contours, weakening of grooves, and processing of machined parts, as well as a high requirement on the accuracy of the processing site. This is difficult to solve in the traditional numerical control processing methods. The existence of flexible body positioning must use inspection technology and design of the 3D CAD model as the only theoretical model for all process manufacturing processes, thereby avoiding human error in the manufacturing process. For connecting parts and siding parts, it is often necessary to completely machine them from a larger blank. The number of loadings is very large and more localized deformations will occur. Processing of local deformed parts is often not possible because of the deformed parts. The possibility of being calibrated is very small. For such problems, it is also possible to adopt a smart card loading method and adaptively and accurately process the local features that need to be processed according to the local processing characteristics. In the actual production, it has a very positive significance. It allows the technicians to arrange more reasonable and efficient aerospace parts processing technology according to the new process technology. This technology solves the problem of CNC machining on the A380 blade repair and key parts manufacturing. More critical issues have played a very important role in shortening the manufacturing cycle.
The basic method for the implementation of intelligent fixtures is the use of professional software. The commonly used mounting methods in the aerospace manufacturing industry include mechanical and hydraulic adjustable fixtures, vacuum adsorption fixtures, etc. This paper describes the key points for vacuum adsorption fixtures. Freely placed fixtures or mechanically adjustable fixtures, but such fixtures often result in differences in the state of the parts each time the fixture is mounted. We hope to use a flexible vacuum chucking system that can handle most parts. Please refer to related literature and products. For multi-axis CNC machine tools, it is necessary to accurately guide the relative spatial position of the workpiece after free clamping. First, we use the PS-FIXTURE system to perform data acquisition and processing on existing workpieces. According to the 3D CAD model of the part, the system compiles the testing program of the CNC machine tool and simulates it. Then it executes the testing program on the CNC machine tool and obtains the test result data on the machine. This is because of the data secrecy. We use similar parts for aerospace manufacturing. To illustrate the problem:
A. Read in the CAD model and input the process information of related parts at the same time. The key point is to make our design, manufacture and inspection form a closed-loop system, instead of using 3D design, and into the field of manufacturing, it becomes a descriptive text. The process and 2D engineering drawings provide the necessary tools for paperless manufacturing, fundamentally ensuring the integrity, coordination, and unity of the manufacturing process.
B. Read the CAM programming path for the normal part status programming. This technique is based on the CAD coordinate system to set the machining coordinate system. The programming process does not need to consider the CAD specific clamping position of the machining process. The software can input the tool output by the CAM software. In the path information, the tool paths that are read in usually have large differences from the CAM model positions in the actual fixture positions. If the programs are processed directly without a self-adaptive process, there is bound to be scrap.
C, according to the system output CNC machine tool detection path in the CNC machine tool to implement the actual parts inspection instructions, the program automatically controls the CNC system to output test results, the output form according to the CNC system a total of different, including CNC machine in the machine or off-line output test results to the intelligent fixture Software system.
D. The intelligent fixture software system carries out the process of software intelligent fixture processing based on the detection results, calculates according to the theoretical CAD model, and adaptively adjusts the relationship between the actual part position on the machine tool and the theoretical CAD model. This is the key to solve the practical application. Sexual steps to obtain adaptive data.
E. The result of the processing is that we can see that the tool path programmed by the normal CAD model is no longer in the correct machining position, the software system will automatically adjust the tool path to the correct position, perform automatic post-processing, and then the CNC machine tool is adjusted. The NC program of spatial position processes the processed workpieces. The entire process is completely completed by the system. At the same time, different customized developments can be made for different products to expand the software to solve the practical problems of specialization and automation.
Advances in software technology can change the mindset of our craftsmen from the process itself. We can use more intelligent gripping technology in the aerospace manufacturing field to maximize the renunciation of the past by mass-manufacturing workpiece clamping fixture systems, reducing or Abandoning the traditional clamp-type clamping of workpieces, and gradually adopting a smart loading system in the process of manufacturing automation, so that the quality assurance system of the manufacturing link forms a closed-loop system, avoiding the complete falsification of the information generated by the manufacturing of information-based open-loop systems. The quality control of the manufacturing process adopts the online quality control system of CNC machine tools. The online quality control system of CNC machine tools compensates for the lack of technology in traditional manufacturing technologies and plays a key role in the quality change and monitoring of the entire manufacturing process.
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