Combined extrusion method using transition cellpacking to realize helical slow-wave structure

Abstract

The invention relates to a travelling wave tube manufacturing technique, especially a novel technique of manufacturing spiral slow-wave structure (SWS). It has the following steps: 1. fixing spiral line together with medium rod by mould; 2. axially sending them in a transition tube casing; 3. squeezing the transition tube casing together with them by the technical method of elastic or plastic deformation cold extrusion so as to obtain a transition module of the SWS; 4. firstly heating the tube casing to 800-1000 deg.C, axially sending the transition module at room temperature in the tube casing at high temperature, and locating; 5. cooling the whole workpiece obtained in the step 4 to room temperature, enclasping the transition module with the tube casing by the shrinkage of the tube casing, thus obtaining the SWS product. It is especially applied to composite tube casing with a more complex structure.

Description

technical field [0001] The invention relates to the manufacturing technology of the traveling wave tube, in particular to a novel process for manufacturing the helical slow wave structure. Background technique [0002] The helical slow wave structure is the core component of the traveling wave tube. Because the helical slow-wave structure has broadband characteristics, the traveling wave tube can generate and amplify microwave or millimeter waves in a wide frequency band. Therefore, traveling wave tubes have important applications in electronic countermeasures, especially in electronic interference. However, the manufacture of the helical slow wave structure is a very complicated process, and its process methods are divided into cold extrusion and hot extrusion. Among them, cold extrusion is divided into two types: elastic deformation extrusion and plastic deformation extrusion, while hot extrusion can be divided into two types: overall heating extrusion and shell heating ...

AI Technical Summary

Problems solved by technology

The structure of this kind of composite shell is more complex, the processing is more difficult, and the processing of the hot extrusion die is also very difficult

The hot extrusion process of this shell is also competent for the helical slow wave structure below the X-band. For the helical slow-wave structure above the X-band, due to the complex shape of the composite shell, the mechanical strength is relatively high, and the elastic deformation and plastic deformation are relatively small, so the cold extrusion process cannot be used

As for the hot extrusion process of overall heating, it is not applicable due to the difficulty in removing the mold

In addition, due to the small thermal deformation, it is easy to break the medium clamping rod during the extrusion process, so there are some difficulties in the hot extrusion process using tube shell heating

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