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УДК 621.372.822
METHODS FOR IMPROVING ACCURACY WHEN BENDING WAVEGUIDES
Waveguide bends are used in antenna-feeder devices of satellite communication systems. They have serious requirements for the accuracy of the channel dimensions. In this paper, methods for improving the accuracy of bending waveguide pipes are analyzed.
Keywords: small-section pipe, waveguide, bending, manufacturing accuracy, calibration.
Сибирский государственный университет науки и технологий имени академика М. Ф. Решетнева Российская Федерация, 660037, г. Красноярск, просп. им. газ. «Красноярский рабочий», 31
E-mail: VT-ak@yandex.ru
Волноводные изгибы применяются в антенно-фидерных устройствах систем спутниковой связи. К ним предъявляют серьезные требования к точности размеров канала. В настоящей работе анализируются, методы повышения точности гибки волноводных труб.
Ключевые слова: труба малого сечения, волновод, гибка, точность изготовления, калибровка.
The relevance of the topic lies in the widespread use of waveguide bends for the manufacture of waveguide lines of antenna-feeder devices.
When bending rectangular pipes, deviations in the shape of profile elements appear: the undulation of the walls parallel to the bending radius, and the concavity on the walls perpendicular to the bending radius. The main ways to prevent deviations when bending pipes are special fillers and devices [1].
An example of the method with a filler is available in the patent [2], plates can be used as a filler
V. V. Timofeev Scientific supervisor - I. V. Trifanov
Reshetnev Siberian State University of Science and Technology 31, Krasnoyarskii rabochii prospekt, Krasnoyarsk, 660037, Russian Federation
E-mail: VT-ak@yandex.ru
МЕТОДЫ ПОВЫШЕНИЯ ТОЧНОСТИ ПРИ ГИБКЕ ВОЛНОВОДОВ
В. В. Тимофеев Научный руководитель - И. В. Трифанов
(Fig. 1).
2
Fig. 1. Bending of a waveguide rectangular tube: 1 - pipe, 2 - plates.
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An example of a method using special devices is the notching method, in which notches are applied using a chisel [3].
longitudinal rib.
One of the most accurate methods of manufacturing waveguide bends, using special devices, is bending with a calibration template (Fig. 3). The use of a rigid calibration mandrel makes it possible to bend waveguide pipes with cross-section sizes from 3.6x1.8 to 11x5.5 mm with an accuracy of ±0.05 mm [4].
a) b)
Fig. 3. Bending of a rectangular pipe of small cross-section with channel calibration: a - device,
workpiece and mandrel before bending; b - position of parts of the device, workpiece and mandrel after
bending.
1-blank; 2- clamp; 3- movable retainer; 4- calibration mandrel; 5-lever; 6- bending template.
To increase accuracy, when bending profiled pipes, calibration operations are resorted to [5].
Examples of calibration operations in the manufacture of rectangular pipes are described in the book [4].
With the help of additional calibration, the accuracy of the dimensions of the waveguide pipe channel in the bending area is increased. This method is applicable for all bending methods and is applied after bending.
Before calibration, the curved waveguide tube is degreased and annealed. Next, the pipe is placed in a fixing device. Calibration rollers, by a friction press or screw device (Fig. 4) [4], are pushed through a waveguide channel. 30-50 rollers are required for calibration. Rollers of variable diameter, each subsequent one is 0.01 mm larger than the previous one. The last 10 rollers are of the same size and correspond to the nominal dimensions of the direct waveguide channel. The rollers, during pushing, smooth out irregularities and settle the metal of the channel walls [4].
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Fig. 4. Calibration of the curved channel of the waveguide tube in the screw device with rollers.
Electrical tests are carried out to check the quality of the waveguide pipe manufacturing. With their help, the standing wave coefficient of the SWR and losses in the waveguide tube are measured
Conclusion: The main methods of increasing the accuracy of manufacturing rectangular waveguide tubes were considered.
There are two main directions, improving the accuracy of bending waveguide pipes:
1. selection of the most accurate manufacturing method suitable for this section;
2. calibration of the waveguide tube channel.
1. Savrovsky D. S., Golovnya V. G. Structural materials and their processing. Textbook for universities. M., "Higher school", 1976. 328 p.
2. Pat. 2663921 Russian Federation: IPC B21D 9/00 Method of manufacturing thin-walled rectangular waveguides / Agashkin S. V., Ivanovsky V. I., Ushakov A. R., Mikhnev M. M. No.2017113630; application 19.04.2017; publ. 20.08.2018, Bul. No. 23. 13 p.
3. Pat. 2669267 Russian Federation: IPC H01P 3/12 Method of manufacturing a rectangular section waveguide/ Tushnov P. A., Kerimov Ya. Sh., Borodina E. A. et al. No.2018102320; application 22.01.2018; publ. 09.10.2018, Bul. No. 28. 13 p.
4. Bushminskiy I.P. Manufacturing of microwave structural elements.Waveguides and waveguide devices: textbook. manual for universities. Moscow: «Vyssh. shkola», 1974. 304 p.
5. Handbook of a machine-building technologist: in 2 vols. Vol. 1 / ed. V. M. Kovan; ed. by tom A. G. Kosilov. 2nd ed., ispr. and add. M. : Mashgiz, 1963. 887 p.
6. Theoretical foundations of construction and test methods of antenna-feeder devices of communication means, monitoring and detection devices: textbook. manual / I. V. Trifonov, L. I. Oborina, A.M. Bakina; SibGAU. Krasnoyarsk, 2010. 108 p.
[6].
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© Тимофеев В.В., 2022
