Ultra slender shaft tapered core bar, manufacturing method of ultra slender shaft tapered core bar and manufacturing method of ultra slender tapered spiral line

Abstract

The invention discloses an ultra slender shaft tapered core bar, a manufacturing method of the ultra slender shaft tapered core bar and a manufacturing method of an ultra slender tapered spiral line. The core bar comprises 30 mm linear segments at the two ends and a 70 mm tapered segment in the middle, the diameter of the linear segment at one end ranges 0.55+ / -0.003 mm, the diameter of the other linear segment at the other end ranges from 0.7 mm + / -0.003 mm, and the taper of the middle tapered segment is 7'27''. The core bar is high in precision, the manufacturing method of the ultra slender shaft tapered core bar is high in operability and can overcome many bottleneck problems in the prior art, the ultra slender shaft tapered core bar which is high in requirements of diameter accuracy and taper accuracy is manufactured, the error is smaller than 0.002 mm, through the core bar, the three-section type ultra slender tapered spiral line with the three sections different in size and taper is manufactured, and the ultra slender tapered spiral line can be applied to traveling-wave tubes which are wide in frequency, high in output power and large in duty cycle and has important application value.

Description

technical field [0001] The invention relates to a method for preparing a helix in a traveling wave tube, in particular to an ultra-slim long-axis tapered core rod, a preparation method thereof, and a preparation method for an ultra-slim long-axis tapered helix. Background technique [0002] The characteristics of modern warfare can be found in local wars in the world in recent years. Electronic countermeasures and air strikes will become important forms of non-contact warfare. Most military electronic systems are inseparable from power traveling wave tubes, and military equipment using millimeter wave technology More and more, its importance is obvious. Compared with microwave, millimeter wave has the advantages of large information capacity, strong anti-interference ability, good directionality, high resolution, small antenna size, and good mobility; compared with light wave and infrared wave band, it has strong ability to penetrate smoke and dust , basically works around ...

AI Technical Summary

Problems solved by technology

[0003] It is extremely difficult to prepare the ultra-slender tapered core rod and the ultra-slender tapered helix, in which the ultra-slender tapered helix consists of three sections, and the tapered size of each section of the helix is ​​different. The dimensional accuracy of a section of helix is ​​particularly high, and there are many bottleneck problems, such as: 1. The size of the helix is ​​small and the precision is high; 2. Secondly, the mechanical properties of the helix material (tungsten), the relative bending radius is small, and the tension and other factors 3. It is difficult to control the winding of each pitch jump; 4. It is difficult to control the shaping temperature and holding time after the helix is ​​wound; 5. After the helix is ​​wound, the grinding of the outer diameter During the processing, the helix cannot be well fixed on the surface of the core rod, resulting in a decrease in the accuracy of the pitch and a decrease in performance; 6. The high-frequency damage of the helical traveling wave tube prepared by the existing method is relatively large, and the performance of the traveling wave tube is poor

And it is necessary to prepare a high-precision ultra-slender tapered helix, and it is necessary to prepare a high-precision ultra-slender shaft tapered core rod, which has not been reported in the prior art

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