Since a large number of sheet metal parts are required in the manufacturing process of aircraft, it is very necessary to carry out timely detection of sheet metal parts, and to control the quality of sheet metal parts accordingly.
In aircraft CNC Machining and manufacturing process, the sheet metal parts used are generally complex in shape and variety, and most of them need to be manufactured with special materials. According to the different structure of sheet metal parts, it can be divided into internal parts, complex parts and stamping parts. The traditional inspection method used for sheet metal parts is generally a tire inspection, through which the quality of sheet metal parts is inspected. However, since this detection method is observed with the naked eye, the detection accuracy is low, the detection efficiency is not high, and it takes a lot of time, and has been gradually eliminated nowadays. With the continuous development of science and technology, my country’s computer technology has also developed significantly.
The application of computer technology to the inspection process of sheet metal parts has realized the integration of the manufacturing and inspection of sheet metal parts. In addition, through the use of computer technology, 3D scanner technology has also been fully utilized, so that the speed of detecting sheet metal parts is effectively improved, and the accuracy of parts detection is higher, which meets the requirements of aircraft manufacturing.
Introduction To The Main Principles Of Sheet Metal Parts Detection
Today, with the rapid development of science and technology, my country has realized the secondary development of the CATI A system. On this basis, the 3D model detection technology can be used in the detection process of sheet metal fabrication parts. It can be said that the detection technology of sheet metal parts is to make full use of the CATI A system to perform three-dimensional scanning of the relevant features of the object. It is necessary to use a 3D scanner to detect sheet metal parts and save the scanned data. Generally speaking, the sheet metal parts of the aircraft are placed in front of the 3D scanner, the scanned 3D model is compared with the theoretical model pre-stored in the equipment, and the surface of the sheet metal part is compared with the surface in the model.
It should be noted that when comparing, it is necessary to pay attention to that each surface tested should be consistent with the model surface, and then judge whether the part is qualified or not according to the standard of parts manufacturing. Generally speaking, the main methods for detecting sheet metal parts using CNC technology are as follows:
- First, fully extract the features of the sheet metal parts, place the parts in front of the corresponding scanning equipment, and use the scanner to extract the features of the parts.
- Secondly, after extracting the main information of the parts, according to the actual manufacturing requirements of the aircraft, design the sheet metal parts, and combine them with the information of the parts. Again, label the acquired information and place the label in the new 3D model.
- Finally, when the inspection is completed, timely feedback is given to the inspection results, and the inspection results are transmitted to the customer.
The Analysis Of 3D Scanning Technology
Compared with other technologies, 3D scanning technology is a new type of technology. It scans the shape and characteristics of objects by making full use of machine, light and computer technology, so that the characteristics of objects can be obtained. The main advantage of this method is that it can significantly improve work efficiency, and is more convenient and more accurate than other techniques. Scanning sheet metal parts with a 3D scanner can quickly obtain relevant features of sheet metal parts, such as 3D coordinates, 3D solid models, etc.
After the scanning is completed, computer technology can be used to compare the difference between the model and the actual part, so as to realize the detection of sheet metal parts. When using 3D scanning technology to scan sheet metal parts, it should be noted that: in order to effectively reduce the scanning error, the 3D scanner should be calibrated regularly to avoid the phenomenon of large differences in detection;
When testing transparent objects or some reflective objects, it is necessary to sprinkle some powder on the surface of the object to ensure that the detection can be carried out; for some parts with small volume and high price, the V model needs to be applied to the finished product , to ensure that one of the parts can be detected during inspection. ; In addition, if the volume of the sheet metal part is too small, it can also be tested on a black board.
The Analysis Of Detection Methods
When inspecting sheet metal parts, it is necessary to align and compare the model with the model scanned from the finished product. Generally speaking, the main alignment methods are: manual alignment, global alignment, coordinate alignment, and feature alignment. Moreover, when comparing sheet metal parts, it needs to be carried out according to the specific characteristics of the parts and the corresponding design requirements.
Notably,when choosing an alignment method, the corresponding alignment method should be used. For example, when feature alignment is used, the features of the model should be selected before the formal alignment, and then the features of the finished product should be selected. Various parameters are set.
When using the coordinate alignment method to detect parts, the problem that needs to be considered is how to establish the coordinates of the parts during detection. There are few positioning holes in sheet metal parts, and because there are corresponding positioning holes in the CATI A system, there are many difficulties in the coordinate positioning of sheet metal parts. After continuous exploration, it is found that the best fitting method can be used to detect sheet metal parts. When the coordinates of the part are established, the shape, structure and hole position of the part can be detected. In addition, it should be noted that after the inspection is completed, it is necessary to compare the errors existing in the parts inspection to ensure that they are within a certain range, so as to judge the qualification of the parts.
To sum up, when testing aircraft sheet metal parts, the application of 3D scanning technology improves the efficiency and accuracy of testing. Placing the sheet metal part in front of the 3D scanner can have a comprehensive display of the shape, structure and features of the part, so that the inspector can have a detailed understanding of the part’s features and make a judgment on whether the part is qualified.
In the detection of sheet metal parts, the use of new technologies can not only effectively improve the accuracy of detection, but also effectively improve the efficiency of detection, save a lot of manpower and material resources, and help the detection of sheet metal parts Therefore, in the future detection process, this technology can be fully utilized.
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