A processing method for improving the dimensional accuracy of hypersonic wind tunnel nozzle interface
A hypersonic, dimensional accuracy technology, applied in the testing, instruments, measuring devices of machines/structural components, etc., can solve the problems of small size, large shape curvature, inability to measure the interface size, etc., to reduce difficulty, improve accuracy, reduce Effects of processing and inspection processes
Active Publication Date: 2021-04-20
中国空气动力研究与发展中心超高速空气动力研究所
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Problems solved by technology
[0004] When the nozzle is processed in sections, the shape curvature near the interface of the smallest section in the middle is large and the size is too small, so measuring tools cannot be used to measure the interface size during the processing
At present, the accuracy control of the interface in the industry is mostly to measure the size of the external reference, relying on the accuracy of the processing equipment itself to indirectly guarantee the dimensional accuracy of the interface, the accuracy can only be guaranteed at ±0.05mm
Method used
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Embodiment 1
[0037] This embodiment is used to process a hypersonic wind tunnel nozzle of the order of Φ500mm, and the schematic diagram of the segmental assembly of the nozzle is shown in Figure 6 . The accuracy of the processed hypersonic wind tunnel nozzle has been improved by an order of magnitude, the processing grade has been raised from IT6 to IT2, and the processing hours have been reduced by 30% to 50%.
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Abstract
The invention discloses a processing method for improving the dimensional accuracy of a nozzle joint of a hypersonic wind tunnel. The machining method includes machining preparation, rough machining, datum surface finishing, nozzle surface finishing and straight edge cutting. In this processing method, the hypersonic wind tunnel nozzle is processed in segments, and a straight-edge segment that can be used to improve the measurement accuracy is added to the sharp corner of the segmental interface, and the interface is guaranteed by high-precision measurement and processing of the straight-edge segment. The dimensional accuracy of the sharp corners, and finally remove the straight edge. This processing method is suitable for workpieces that are not easy to measure the size of the joints such as pipes with curved lines, pipes with oblique lines, and curved cavities. It is used to control the dimensional accuracy of the joints during assembly and assembly, and can meet the requirements of hypersonic wind tunnel nozzles. The high-precision requirement of segmented docking greatly reduces the difficulty of processing control, and has the advantages of economy, practicality and simplicity.
Description
technical field [0001] The invention belongs to the field of hypersonic wind tunnel test equipment, and in particular relates to a processing method for improving the dimensional accuracy of a nozzle interface of a hypersonic wind tunnel. Background technique [0002] The wind tunnel is an indispensable ground equipment in the development of aircraft, and the nozzle is the key component in the wind tunnel. The nozzle of the hypersonic wind tunnel is a Laval nozzle. The molded line is in the shape of an asymmetrical hourglass with contraction in the middle and expansion at both ends. The difference between the minimum size in the middle and the maximum size at both ends can reach more than 10 times. [0003] Due to the limitation of the shape of the hypersonic wind tunnel nozzle itself, the machining industry adopts the method of segmental processing and then assembly. This method has very strict requirements on the quality control of the interface between the two sections. ...
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IPC IPC(8): B23D79/00G01M9/04
CPCB23D79/00G01M9/04
Inventor 杨波范孝华孙启志孟祥润吴岸平张傲李俊朱涛许晓斌
Owner 中国空气动力研究与发展中心超高速空气动力研究所