RU2249274C2 - Method for manufacturing multibeam o-type device - Google Patents

Abstract

FIELD: manufacture of vacuum-tube parts and assembly of O-type multibeam electron guns.

SUBSTANCE: proposed method intended to ensure better alignment of electron-optical system components, or more precisely, to align holes of control grid with those of transit-time channels of anode for easier current flow through device includes soldering of insulators, control grid, and seating flange together at preset elevation of grid above flange; installation of assembled cathode unit at preset gap between cathodes and control grid; alignment of cathodes with hole in the latter; fixation of cathode unit in insulator by spot welding; installation of assembled gun into device against seating diameters and pins in key holes of anode pole shoe and seating flange, the latter being composed of two parts of which one having key holes and seating diameter is movable and mounted on second fixed part prior to installing gun into device; after that key holes are aligned with grid holes against angle of turn and secured on fixed part.

EFFECT: enhanced precision of assembly.

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Description

The present invention relates to a technological process for the production of multipath electron beam computers, namely, to the process of assembly and alignment of multipath electron guns. The use of the multipath structure of an electron-optical system (EOS) of devices significantly complicates the alignment of electrodes (elementary cathodes, holes in the control grid and anode), the seats of the elements of the electron gun and the anode of the device. A multipath electron gun usually terminates in a flange made of iron, which is a landing part in the anode.

A known method of assembly and alignment of the electrodes of a multipath gun [1], figure 1, in which the combination of the individual cathodes 1 with the holes of the control grid 2 is carried out under a microscope by moving the grid with screws in a special mandrel; after alignment, the mesh is fixed on the holder using laser welding. The method described in [1] does not specify the methods of centering the elements of the EOS (cathodes, mesh holes) with holes in the anode of the device. Landing an electron gun in the anode of the device, aligning it with the holes of the anode and fixing the gun are critical operations in the manufacturing process of the device.

The closest technical solution (prototype) is the method described in [2], Fig.2. Here, the assembly and alignment of the gun’s EOS elements is relative to two holes on the flange 3 of the electron gun. First, the control grid 2 is soldered into the node of the insulator 5 with the centering and orientation of the working holes of the grid relative to the two holes in the flange 3. Then, the cathode assembly 4 is installed in the node of the insulator 5 with the centering of the elementary cathodes 1 with the holes of the control grid 2 with spot welding. The assembly of the assembled gun in the anode of the device is carried out according to the landing diameters D of the flange and the pole tip of the anode, and the combination of the mesh holes with the holes of the anode is provided by pins in the two holes of the flange and the pole tip.

The disadvantage of this method is the following. In the process of high-temperature brazing of parts from dissimilar materials of electronic gun assemblies, anode parts, the flange and pole tip are deformed, the shape and dimensions of the mounting diameters, the diameters of the holes for the pins are changed. As a result, it is difficult to assemble the gun with the anode of the device, there is a significant decentration of the holes of the control grid and the anode.

The aim of this invention is to improve the accuracy of the assembly by improving the alignment of the elements of the EOS of multipath devices, more precisely the holes of the control grid with the holes of the passage channels of the anode, respectively, improving the current flow of the device.

This goal is achieved by the fact that in the method of manufacturing a multi-beam electron gun, including soldering insulators, a control grid, a landing flange, assembling a cathode assembly with centering elementary cathodes with mesh holes, in order to improve the accuracy of assembly, the landing flange is made detachable in two parts (the flange itself and ring).

The invention is illustrated in the drawing, where figure 3 shows an electronic gun made by the proposed method.

The electron gun contains a cathode assembly 4 with elementary cathodes 1, an insulator 5, including a grid 2, a landing flange with a fixed part (the flange itself) 3, ceramic insulators 7 and copper cups 8. The insulator 5 is made for one soldering on a special mandrel, providing a position on the height of the mesh 2 relative to the flange 3, the ring 6 with the mounting diameter D and centering holes for the pins 10 is fixed with a special mandrel that provides the specified position of the centering holes and the mounting diameter D of the ring relative to about the holes in the grid 2 and is fixed on the flange by welding (contact, laser). Since the ring does not pass the soldering operation, it has very precise dimensions and provides high centering of the holes of the control grid 2, landing diameters D and centering holes for the pins 10.

The cathode assembly 4 with elementary cathodes 1 is mounted in the insulator assembled with the ring. The copper bottom 9 closes the vacuum cavity of the electron gun. After welding the cup 8 and bottom 9, the assembly of the electron gun is completed. In the pole tip of the device 11, the electrode gun is installed along the bore diameter D with angle fixing with pins 10.

Similarly, the pole piece 11 can also be made integral (ring 12, figure 3). Ring 12 also provides a landing dimension D for the gun and two centering holes for the pins 10. Ring 12 also does not undergo soldering operations, has exact dimensions after machining, and is mounted in the mandrel coaxially with the working holes of the anode with fixing by welding.

This eliminates the influence of the deformation of the pole tip on the accuracy of the gun.

Carrying out control measurements on a multipath gun (the number of holes in the grid and the number of cathodes 24, the diameter of the mesh holes 4.0, the bore diameter D is 66 mm) without the use of ring 6 showed that the alignment of the centering holes with the mesh holes is within 0.1 mm, using ring 6, the alignment is 0.02-0.03 mm.

In addition, the assembly of a gun with a pole tip without the use of ring 6 is very difficult due to deformation of the landing diameters.

Therefore, the use of a detachable flange on a multipath electron gun made it possible to eliminate the influence of deformation of parts during soldering on the final assembly of the assembly, to improve the accuracy of combining the working holes of the control grid and the anode, while preserving the overall configuration of the flange as a magnetic circuit and the supporting part of the electron gun.

Sources of information

1. Andreev A.A., Babanov T.N. et al. Design and technological features of an electron gun with grid control. - Special Electronics, ser. 1, 1985, issue 3, p. 37.

2. Kuklyaev A.S. Pulse amplifier klystron cm wavelength range with a power output level of 50 watts. - Special Electronics, ser. 1, 1987, issue 6, p. 44.

Claims (2)

1. A method of manufacturing an O-type multipath microwave device, including connecting soldered insulators, a control grid and a mounting flange with a given grid height above the flange, installing an assembled cathode assembly with a given cathode clearance relative to the control grid, combining the cathodes with a hole in it and securing the cathode assembly spot welding in the insulator, installation of the assembled gun into the device according to the mounting diameters and pins in the key holes of the pole end of the anode and the mounting flange, characterized in that, with the aim of To improve current flow by improving the accuracy of combining the working holes of the control grid and the anode, the mounting flange is made up of two parts, one of which, having key holes and a mounting diameter, is movable and mounted on the stationary second part before installing the gun in the device, and then combine key holes in the angle of rotation with the holes of the grid and fixed on a fixed part. 2. The method according to claim 1, characterized in that the pole tip of the anode is made of two parts, one of which having key holes and a bore diameter, is movable and mounted on a fixed second part connected by soldering to the anode, and then combine the key holes in the rotation angle with the holes of the anode and are fixed on a fixed part.

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