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Секция
«МЕТРОЛОГИЯ, СТАНДАРТИЗАЦИЯ И СЕРТИФИКАЦИЯ»
УДК 621.372.822
OVERVIEW OF METHODS FOR BENDING RECTANGULAR WAVEGUIDE PIPES
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
Rectangular waveguide tubes are widely used in power transmission lines of antenna-feeder devices of spacecraft. This article analyzes new and patented methods of bending rectangular pipes. Conclusions are drawn about the applicability of these methods.
Keywords: small-section pipe, waveguide, bending methods, manufacturing accuracy, patents.
ОБЗОР МЕТОДОВ ГИБКИ ПРЯМОУГОЛЬНЫХ ВОЛНОВОДНЫХ ТРУБ
В. В. Тимофеев Научный руководитель - И. В. Трифанов
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
Прямоугольные волноводные трубы широко используются в линиях передачи энергии антенно-фидерных устройств космических аппаратов. В данной статье анализируются новые и запатентованные методы гибки прямоугольных труб. Делаются выводы о применимости этих методов.
Ключевые слова: труба малого сечения, волновод, методы гибки, точность изготовления, патенты.
The relevance of the topic lies in the widespread use of rectangular waveguide tubes of small cross-section in the power transmission lines of antenna-feeder devices of spacecraft.
The process of bending rectangular pipes can be implemented by various methods [1]:
-Winding the pipe on the copier
-Bending of the pipe in the stamping device
-Bending using three rollers
-Bending using hydrostatic molding
-Pushing the pipe through the channel of the split matrix
The method of pushing a rectangular pipe through the channel of a detachable matrix is often used in serial small-scale production. There is a modification of this method involving bending with a variable radius, instead of bending by involute [1]. Modification reduces the bending radius and increases the bending quality. The main disadvantage of the method is the need to use an expensive matrix in the manufacture.
There are modern patents for obtaining the bending of rectangular pipes [2, 3].
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For example, bending using a filler made of plates placed inside the channel (Fig.1) [2]. The main disadvantage of the method is the need for technological operations to install and remove the plate filler from the pipe channel.
2 1
Fig.1 Bending of rectangular waveguide tubes using plates.
The second example is bending with the application of notches that form channels and ribs on the upper and lower sides of the workpiece (Fig.2) [3]. Notches are applied with variable pitch. This method is applicable for rectangular pipes with cross-section sizes from 11x5.5 to 248x124mm.
Fig.2 Bending of thin-walled waveguide tubes of rectangular cross-section by the method of notches.
For the manufacture of bending rectangular pipes with a cross section from 3.6x1.8 to 11x5.5 mm, we apply a method using rigid calibration equipment (Fig. 3) [4]. The accuracy of this method is ±0.05 mm [4].
a) b)
Fig. 3. Small-section pipe bends with internal cross-section calibration: a - blanks and mandrels at the initial moment of bending; b - blanks and mandrels after bending.
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Before starting bending, it makes sense to check the roughness of the inner surface of the waveguide tube. It is possible to check the roughness using the MarSurf M 400 device. It allows you to measure the roughness of channels larger than 2.8 mm [5].
After the waveguide tube is manufactured, a quality control stage follows. The manufacturing quality of the waveguide tube is checked by electrical tests. Measurements of SWR (Standing-wave ratio) and losses in the waveguide tube are carried out [6].
Conclusion: Various methods of bending rectangular pipes were considered. The choice of the most suitable bending method depends on the cross-section size, the required manufacturing accuracy, as well as on the batch size of the products. The most suitable and accurate (±0.05 mm) bending method is bending with the use of calibration mandrels. This method is used for bending pipes with cross sections from 3.6x1.8 to 11x5.5 mm.
References
1. Siao Siaоtin. Improvement of the technology of bending of pipes of rectangular section pushing: dis. ... kand. techn. nauk. M., 2004. 178 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. Surface measurement technique. URL: http://www.s-t-group.com/catalog/Mahr/ izmerenie_poverhnosti.pdf (accessed: 07.04.2022).
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.
© Timofeev V.V., 2022
