JPH0256823A - Manufacture of magnetron anode body structure - Google Patents

Abstract

PURPOSE:To reduce the manufacturing cost of the anode body structure in the title, by forming at least either one of each anode strap and a microwave output leading-out conductor, out of copper, coating its surface with a metallic plating layer of thermal conductivity lower than that of the copper, and radiating laser beams onto the conjoined portion of the anode strap or the conductor and each anode vane for melting the plating layer. CONSTITUTION:At least either one of each of anode straps 9, 10 which short- circuit many copper anode vanes, 2a, 2b alternately, and a microwave output leading-out conductor 11 mounted onto one of these anode vanes, 2a, 2b is formed out of copper and then, its surface is coated with a metallic plating layer having its thermal conductivity lower than that of the copper so that laser beams are radiated onto conjoined portions of the anode straps 9, 10 or the conductor 11, and the anode vanes, 2a, 2b for melting plating layers, 9b to 11b. A fast sticking effect can be produced accordingly without any hindrance, even if the plating layers, 9b to 11b have their melting point higher than that of the copper. This procedure eliminates the necessity of a heating furnace for melting a silver soldering material as in the prior art process so that the cost of soldering can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method of manufacturing an anode structure of a magnetron used in microwave heating equipment such as a microwave oven.

2. Description of the Related Art In general, the anode structure of a magnetron is made of oxygen-free steel and is constructed as shown in FIG.

That is, a large number of rectangular anode vanes 2 a, 2 b, 2 c, .
. . . are short-circuited by the large-diameter and small-diameter pressure equalizing rings 3 and 4 at every other position on the upper and lower sides, and the microwave output lead wires 5 extending from the two anode vanes 2c are The wave output terminal 6 is reached. 7 is an insulating ring,
8 indicates a metal tube for sealing.

Anode vanes 2 a, 2 b, 2 c for anode cylinder l
The fixation of .
This is accomplished by brazing using silver as a brazing material. Furthermore, the pressure equalizing rings 3, 4 are fixed to the anode vanes 2a, 2b, 2c, etc. by brazing using a silver plating layer provided in advance on the surfaces of the pressure equalizing rings 3, 4 as a brazing material. The fixing of the conducting wire 5 to the anode vane 2c is achieved by brazing the surface of the conducting wire 5 with a silver plating layer which has been caulked and provided as a brazing material.

On the other hand, the anode vanes 2a, 2b, 2c (old...
... to the anode cylinder 1, the pressure equalizing rings 3 and 4 to the anode vanes 2a, 2b, 2c..., and the conductor 5.
A method is also known in which the electrodes are brazed to the anode vanes 2c, respectively.

Problems to be Solved by the Invention However, when applying the conventional brazing method as described above, it uses silver as the brazing material, which increases costs, and furthermore, it requires a heating furnace to melt the silver brazing material. Therefore, a considerable amount of expense is required in terms of equipment and maintenance management.

Therefore, it is an object of the present invention to provide a method for manufacturing an anode structure that can reduce the cost required for brazing and also provide a robust fixing effect.

Means for Solving the Problems According to the manufacturing method of the present invention, at least one of a pressure equalizing ring that short-circuits a large number of copper anode vanes every other time, and a microwave output lead-out conductor that is attached to one of the anode vanes. is made of copper, its surface is coated with a plating layer of a metal having a lower thermal conductivity than copper, and the plating layer is coated by irradiating the pressure equalizing ring or the joint between the conductive wire and the anode vane with a laser beam. Let it melt.

Function: With this structure, not only an expensive silver brazing material is not required, but also a heating furnace is not required, so that manufacturing costs can be reduced. In addition, instead of the silver brazing filler metal used in the copper pressure equalization ring and microwave lead-out conductor, which could not be directly welded to the copper anode vane, a relatively inexpensive metal such as nickel or its alloy was used as a plating layer. None, because this plating layer is melted with a laser beam, it is not a problem even if the plating layer has a higher melting point than copper (a robust fixation effect can be obtained).

Embodiments Next, the present invention will be explained along with embodiments shown in the drawings.

As shown in FIG. 1, a steel anode vane 2a is brazed to the inner peripheral surface of a copper anode cylinder 1.

2b, 2c, . . . have large-diameter and small-diameter pressure equalizing rings 9, 10 press-fitted into their upper and lower concave grooves. Each equalizing ring 9
, 10 are plated layers 9b, 1 of nickel, which is a metal with lower thermal conductivity than copper, on the surfaces of steel core materials 9a, 10a.
0b, respectively. Further, the microwave output lead wire 11 whose one end is fixed to the anode vane 2c has a core material 11a made of steel and a plating layer of nickel, which is a metal with lower thermal conductivity than copper. 11b
It consists of

Anode vanes 2a, 2b, 2c... and pressure equalizing ring 9,
1° and the joint between the anode vane 2c and the conducting wire 11 are sequentially or simultaneously irradiated with laser light for laser welding. As a result, the thermal energy generated at the joint portion is transferred to each plating layer 9b, 1 of the pressure equalizing rings 9, 10 and the conductive wire 11.
A portion of 0b and llb is melted, and the core materials 9a and 10a are the respective base materials.

Melt part of 11a. Therefore, the pressure equalizing ring 9°10 and the anode vanes 2a, 2b, 2c...
The conductive wire 11 and the anode vane 2c are each firmly coupled.

Effects of the Invention As described above, according to the present invention, welding of steel parts and copper parts, which was conventionally considered to be very difficult, can be easily achieved without using a silver brazing material or a heating furnace, and the manufacturing cost can be reduced. This can be significantly reduced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partial perspective view of a magnetron anode assembly according to the present invention, and FIG. 2 is a partial perspective view of a conventional magnetron anode assembly. 1...Anode cylinder body, 2a, 2b, 2c...
・Anode vane, 9, 10... pressure equalization ring, 9a, 1
0a...core material, 9b, 10b...plating layer, 11...conductor wire for deriving microwave output, l
la... core material, llb... plating layer. Name of agent: Patent attorney Shigetaka Awano 1 fool/-=7'
j% extreme childcare leave 2a, ;lb, Zc ・-Tty@Beon 9, 10
- Mr. Ichiyuki 9L, 10a, fltt-Z material qb, tab
, 1lb --- 10 plating layers

Claims (1)

[Claims] At least one of a pressure equalizing ring that short-circuits every other numerous copper anode vanes protruding from the inner circumferential surface of the anode cylinder toward the central axis, and a microwave output lead wire attached to the anode vanes is made of copper. At the same time, its surface is coated with a plating layer of a metal whose thermal conductivity is lower than that of copper, and the plating layer is melted by irradiating the pressure equalizing ring or the joint between the conductive wire and the anode vane with a laser beam. A method for manufacturing an anode structure for a magnetron, characterized by: