JPS61124023A - Manufacture of magnetron - Google Patents

Abstract

PURPOSE:To save the amount of expensive solder material to be used and to easily obtain a magnetron having stable quality by depositing solder material to the vicinity of the vane mounting portion of an antenna and assembling the antenna with a vane to firmly solder them. CONSTITUTION:Prior to assembling of an antenna 3 and a vane 2, Ag powder is firmly attached through plasma welding to the upper portion of a notch 3a in the vicinity of the extreme end of the antenna 3 adjacent to the vane 2 to form an Ag attachment 7. The notch 3a of the antenna 3 is combined with a notch 2a of the vane 2 and the Ag attachment 7 is melted in nonoxydizing atmosphere to mechanically and electrically connect the antenna 3 and the vane 2. This method is effective to save the amount of expensive silver to be used and to manufacture magnetrons having high quality with high productivity at a low cost.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a method of manufacturing a magnetron, and more particularly to a method of assembling an anode assembly.

[Background of the invention]

FIG. 1 is a vertical sectional view of a main part showing an example of an anode assembly of a magnetron known from Japanese Utility Model Application Publication No. 53-51169. In the figure, 1 is a cylindrical part, 2 is a plurality of vanes forming a cavity resonator inside this cylindrical part 1), and any one of these vanes 2 has a microwave output to the outside. An antenna 3 is fixed to the antenna. 4m
, 4b is a strap ring that alternately connects a plurality of vanes 2 every other vane to perform stable oscillation.

In such a configuration, the method of fixing the antenna 3 to the vane 2 is as shown in FIG. The two notches, each having a width approximately equal to the plate thickness of the antenna 3, are fitted together, and a wire-shaped silver solder (usually Ag:Cu=72:28 (weight ratio)) as shown in FIG. A eutectic alloy) 5 molded into a shape that roughly follows the cross section of the antenna 3 was supplied as shown in Fig. 4, and heated at approximately 850°C in a non-oxidizing atmosphere such as hydrogen.
Silver soldering is carried out by raising the temperature to .

However, such an assembly method has the following problems. In other words, (1) the silver solder 5 mentioned above is handled as one assembly component, so it requires the necessary precision as an independent component especially when it is assembled using methods such as automatic assembly, and the supply method is also different from other components. It is also small and difficult, which increases the number of assembly steps and makes automatic assembly extremely difficult.

(2) The amount of silver solder 5 is the same as that of antenna 3 and vane 2 as described above. Notch part 3m, 2
It is important that the water flow completely only to the part where m is fitted.
, the amount of expensive silver solder 5 used increases because the amount of silver solder 5, which is expensive, is required to be supplied with a sufficient margin than the minimum required amount in consideration of fluctuations in the flow rate.

(3) Due to the excess outflow of the silver solder 5, silver solder stagnation occurs near the strap rings 4m and 4b, which changes the resonance characteristics.

To improve this problem, see Figures 5 and 6.
As shown in the figure, it is also possible to reduce the amount of silver solder 5 used by providing a silver plated opening at the tip of the antenna 3 connected to the vane 2. (11 problems can be improved, but (2), (3)
) could not be sufficiently improved. Also,
The silver plating port on the tip of the antenna 3 requires equipment that is completely different from mechanical assembly equipment, such as electroplating using acid, cleaning using water, and drying with hot air, which can easily lead to corrosion of the equipment. Since harsh special chemicals are used, there are many inconvenient problems such as pollution prevention, and the overall improvement effect is small.

[Purpose of the invention]

SUMMARY OF THE INVENTION Therefore, the present invention has been made in view of the above-mentioned conventional problems, and its objects are to provide an anode assembly that is easy to assemble and to reduce the amount of expensive wax used.
It is an object of the present invention to provide a method for manufacturing a magnetron that can obtain a magnetron of stable quality.

[Summary of the invention]

In order to achieve such an object, the method for manufacturing a magnetron according to the present invention involves welding a brazing member containing at least the main component of a brazing material near the vane implantation part of the antenna, and then assembling the brazing member to the vane, and brazing is performed on the vane. This is what I did.

[Embodiments of the invention]

Next, embodiments of the present invention will be described in detail using the drawings.

7 and 8 are assembly process diagrams of an anode assembly for explaining one embodiment of the method for manufacturing a magnetron according to the present invention, and the same parts as in the previous figures are given the same reference numerals. In these figures, first of all, Figure 7 (') l (
As shown in b), before combining the antenna 3 and the vane 2, A2 powder is fixed by plasma spraying above the notch 3a near the tip of the antenna 3 on the pane 2 side. A fixed body 7 is formed. Next, the antenna 3 to which the A''!-fixed body 7 is attached is assembled with its notch 3a into the notch 2 & of the vane 2 as shown in FIG. 8 in a non-oxidizing atmosphere such as hydrogen. The A? fixed body 7 is melted by raising the temperature to about 850° C., and is welded along the joint between the antenna 3 and the vane 2 to mechanically and electrically couple them.

According to this method, a required amount of A1 powder is intensively sprayed above the notch 3 of the antenna 3 by plasma spraying. Since the fixed body 7 is formed, the usage efficiency of the AP brazing material is extremely good, and since excess AP brazing material does not flow out, the quality can be stabilized.

In addition, plasma spraying of Kkt powder can be easily performed in the supply path of the supply section of the antenna 3 of the automatic anode assembly apparatus, so that the configuration of the entire automatic assembly apparatus can be greatly simplified.

In another embodiment of the present invention, before combining the antenna 3 and the vane 2, a resin such as acrylic is applied above the notch 3a near the tip of the antenna 3 on the pane 2 side. , before this resin dries, A1 powder is attached.Next, the resin is heated in a small scale non-oxidizing atmosphere to thermally decompose the resin and the A1 powder is sintered or welded.
y fixed body 7 is formed. After that, the antenna 3 and the vane 2 are mechanically connected through the same process as in the first embodiment described above.
According to such a method, the same effect as described above can be obtained, and it is also possible to coexist with an automatic assembly device.

〔Effect of the invention〕

As explained above, according to the present invention, it is possible to save the amount of expensive silver used, prevent excess wax from flowing out, and stabilize the properties.In addition, automatic assembly is facilitated. This has an outstanding effect in that a magnetron with stable quality can be obtained at low cost and with high productivity.

[Brief explanation of the drawing]

FIGS. 1 to 6 are cross-sectional views of a conventional anode structure and diagrams for explaining its assembly method, and FIGS. 7 and 8 are
The figure is a diagram for explaining an example of the method for manufacturing a magnetron according to the present invention. ,
31φ...Notch, 4 breath, 4b--Strap ring, 5...Silver wax, 6...Fist silver plating,
Agent: Patent Attorney Akio Takahashi, -,',:. Figure 1 Figure 2゜Figure 4

Claims (1)

[Claims] In a magnetron comprising at least a plurality of vanes forming a cavity resonator and an antenna implanted in any one of these vanes, at least a brazing material is applied to the vane side end of the antenna. A method for manufacturing a magnetron characterized by preliminarily welding the main components, then combining them with a vane and brazing them in a reducing atmosphere.