JPS5916242A - Manufacturing method of anode plate for magnetron - Google Patents

Abstract

PURPOSE:To efficiently manufacture a number of anode plates with a silver solder layer in the preset silver soldering area of a laminated body and obtain an accurate silver soldering effect and the reduction of manufacturing cost by watertightly covering the exposed surface other than at least the preset silver soldering area of the laminated body with a corrosion resisting coating material and applying silver plating treatment. CONSTITUTION:Corrosion resisting plates 20 and 21 are pressed watertightly on each of the outer surfaces of two metal flat plates 12a and 12z located at the outermost end of a laminated body. Then, a silver layer of about 10mum thick is formed on the exposed surface of the laminated body by inserting such a body structure in a plating treatment container and applying high speed plating treatment. When the plates 20 and 21 and a coating member 16 are removed after plating treatment, since a silver soldering material layer 22 is provided at least in the preset silver soldering area of each metal flat plate, it is arranged in an anode cylindrical body as an anode plate. In addition, when a required mean pressure ring and a conductor for inducing an electromagnetic wave are built in at the preset position and the silver soldering material layer 22 is melted in a furnace, an anode body structure is obtained without using a ring-type silver soldering material.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for manufacturing an anode plate disposed within an anode cylinder of a magnetron to form a resonant cavity.

Conventional Structure and Problems The anode structure of a magnetron usually includes a cylindrical anode tube 1 and a plurality of tubes protruding from the inner peripheral surface of the anode tube 1 toward the central axis, as shown in FIG. rectangular anode plates 22L, 2b.
..., upper inner pressure equalizing ring 3, and upper outer pressure equalizing ring 4
, a lower inner pressure equalizing ring 6, a lower outer pressure equalizing ring 6, and an antenna-shaped electromagnetic wave deriving conductor 7 protruding from the anode plate 2iL toward an electromagnetic wave emission end (not shown). Then, the upper inner pressure equalizing ring 3 and the lower outer pressure equalizing ring 6 are soldered to every other anode plate, and the upper outer pressure equalizing ring 4 and the lower inner pressure equalizing ring 6 are brazed to the remaining anode plates. In addition, the anode plate 21
&, 2b...... have pressure equalizing ring insertion grooves sa, sb... near one end of the upper long side, and a pressure equalizing ring insertion groove 9a near one end of the lower long side. , 9b'jz respectively.

By the way, the above-mentioned anode parts are usually made of copper, and each part is assembled integrally using silver solder. That is, the anode cylinder 1 and the anode plate 2a.

2b... are soldered together with a ring-shaped silver brazing material 1o, and the anode plate 2a and the electromagnetic wave deriving conductor 7 are soldered together with a ring-shaped silver brazing material 11, forming the anode plate 2a.

2b... and the pressure equalizing ring 3.4.5.6 are soldered together with silver solder material which has been pre-plated on the pressure equalizing ring.

Therefore, the ring-shaped silver brazing material 10 is
b... must be correctly held in the specified position from the time it is assembled into the anode cylinder 1 until the soldering is completed, but the position may often shift due to vibrations etc. during movement between processes. This can lead to undesirable results such as anode plate dislodgement and localized concentration of solder metal. Furthermore, since there are a large number of parts, management of the parts becomes complicated, and there is a drawback that a reduction in manufacturing costs cannot be expected.

OBJECTS OF THE INVENTION The present invention has been made with the above-mentioned points in mind. The purpose is to have a layer of silver brazing material in the area where it will be deposited.

According to the method of manufacturing an anode plate for a magnetron of the present invention, a large number of rectangular flat metal plates each having a groove for inserting a pressure equalizing ring near one end of the long side are superimposed watertightly with their plate surfaces facing each other, and such lamination is performed. The exposed surface of the body, excluding at least the area to be soldered, is watertightly covered with a corrosion-resistant covering member, and a silver plating treatment is performed to form a layer of silver brazing material at least in the area to be soldered.

DESCRIPTION OF EMBODIMENTS To explain the manufacturing method of the present invention together with the embodiment shown in the drawings, in FIGS. 2 and 3, a large number of rectangular metal flat plates 1 are stacked watertightly so that the plate surfaces face each other.
2a, 12b... are grooves 13 for inserting pressure equalizing rings near one end of the long side! L, 13b..., and pressure equalizing ring insertion grooves 14a, 14b... near one end of the lower long side.
..., and grooves 15a, 15b for electromagnetic wave deriving conductors are provided in the middle of the upper long side, respectively.

On the other hand, the cover member 16, which is an elongated magazine with a C-shaped cross section and is made of synthetic resin or other corrosion-resistant material and is attached to the laminate, has a flat metal plate 12a, 12t)... Watertightly covers the cathode side end faces 17 of the - side edges, and watertightly covers the cathode side inner faces 18 of the pressure equalizing ring insertion grooves 131L, 13b, etc. on the inner surface of the hook-shaped portion of the - side edge. , and the outer surface of the hook-shaped portion on the other side edge watertightly covers the inner surface 19 of each anode cylinder side of the pressure equalizing ring insertion grooves 141L, 14b, . . . .

Further, as shown in FIG. 4, corrosion-resistant backing plates 20 and 21 are pressed against the outer surfaces of the two metal flat plates located at the outermost ends of the laminate, 2 and 2.2 ψδ, in a watertight manner. The structure is then inserted into a plating bath and subjected to high-speed plating to form a silver layer with a thickness of about 10 μm on the exposed surface of the laminate.

When the backing plates 20 and 21 and the covering member 16 are removed after the plating process, as shown in FIG. Arranged as a plate inside the anode cylinder. and,
The necessary pressure equalizing ring and conductor for deriving electromagnetic waves are assembled in predetermined positions, and the silver brazing material layer 22 is melted in a furnace, thereby obtaining an anode structure without using a ring-shaped silver brazing material.

In addition, all the anode plates have grooves 151L, 15b...
Since it is not necessary to provide such grooves, it is sufficient to prepare one having such grooves and one without.

Also, every other anode plate can be used upside down.

Effects of the Invention As described above, according to the manufacturing method of the present invention, it is possible not only to manufacture a large number of anode plates having a silver solder material layer in the area where silver soldering is planned, but also to reduce the number of man-hours for manufacturing the anode structure. , it is possible to prevent excess or deficiency of silver brazing material, and it is possible to obtain a reliable soldering effect and a reduction in manufacturing costs.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the main parts of a tank illustrating a conventional method for manufacturing an anode assembly for a magnetron, and FIG. 3 is a side sectional view of the same essential part, FIG. 4 is a plan view of the essential part, and FIG. 6 is a side view of the anode plate manufactured according to the same embodiment. 12&, 12b...metal flat plate, 16...
. . . Covering acoustic μ material, 22 . . . Silver brazing material layer.

Claims (1)

[Claims] A large number of rectangular metal flat plates each having a groove for inserting a pressure equalizing ring near one end of the long side are stacked watertightly so that the plate surfaces face each other, and at least the exposed surface of the laminate, avoiding the area to be soldered, is coated with corrosion resistance. A method for producing an anode plate for a magnetron, which comprises covering the anode plate in a watertight manner with a member and performing silver plating treatment to form a layer of silver solder material at least in the area to be soldered.