JP3394840B2 - Apparatus and method for producing electrode material for vacuum valve - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum valve electrode material manufacturing apparatus and method for manufacturing a vacuum valve electrode material by infiltrating a skeleton with a metal for infiltration in a crucible.

[0002]

2. Description of the Related Art Conventionally, as a method for manufacturing an electrode material used in a vacuum valve, there is a method in which raw material metal powders are blended, well mixed, molded, sintered, and further infiltrated. . The electrode of the vacuum valve is formed by machining the electrode material thus obtained and brazing it to the electrode rod.

FIG. 6 is a cross-sectional view showing a conventional method for manufacturing an electrode material disclosed in, for example, Japanese Patent Publication No. 50-21670. In this method, as shown in FIG. 6A, a metal 3 for infiltration (for example, copper) is placed on a skeleton 2 having appropriate holes, and these are loaded into a graphite crucible 1, A predetermined heat treatment is performed to allow the infiltration metal 3 to uniformly permeate the skeleton 2 to obtain an electrode material 5 as shown in FIG. 6B.

FIG. 7 is a sectional view showing another example of a conventional method for manufacturing an electrode material. In this method, as shown in FIG. 7 (a), a recess 1a is provided in the center of the bottom of a graphite crucible 1, a skeleton 2 is put in this crucible 1, and an infiltration metal 3 is placed on it. Heat treatment is performed. As a result, the infiltration metal 3 is uniformly impregnated into the skeleton 2, and the filling layer 3a of the infiltration metal 3 is formed in the recess 1a of the crucible 1. In this example, copper is used as the infiltration metal 3, and the copper filling layer 3a is used as a brazing joint with an electrode rod (not shown).

[0005]

In the conventional method for manufacturing an electrode material as described above, excessive infiltration metal 3 adheres to the outer peripheral portion of the skeleton 2 to cause distortion in the outer shape, resulting in machining. There is a problem that it is difficult to chuck at this time and the workability is deteriorated.

The present invention has been made to solve the above problems, and it is possible to prevent excessive infiltration metal from adhering to the outer peripheral portion of the electrode material for a vacuum valve. It is an object of the present invention to obtain a manufacturing apparatus and a manufacturing method of an electrode material for a vacuum valve, which is capable of improving the workability of the electrode material.

[0007]

According to a first aspect of the present invention, there is provided an apparatus for manufacturing a vacuum valve electrode material, comprising: a concave portion for receiving an excessive infiltration metal in an inner bottom portion of a crucible located below the skeleton; and a skeleton. And a guide channel for guiding the excessive infiltration metal flowing in the outer peripheral portion of the groove to the recess.

In the vacuum valve electrode material manufacturing apparatus according to the second aspect of the present invention, a plurality of projecting portions for supporting the skeleton are provided on the inner wall surface of the crucible to form the guide passage between the projecting portions. It is a thing.

According to a third aspect of the present invention, there is provided a vacuum valve electrode material manufacturing apparatus in which a plurality of crucibles are integrally provided by providing a plurality of recesses in one plate member.

In the method of manufacturing the electrode material for a vacuum valve according to the fourth aspect of the present invention, the excessive infiltration metal at the time of infiltration is guided to the inner bottom portion of the crucible by the guide passage provided in the crucible. It was done.

[0011]

In the invention of claim 1, the excess infiltration metal flowing out at the time of infiltration is caused to flow from the guide channel to the recess, so that the excess infiltration metal remains attached to the outer peripheral portion of the skeleton. Prevent.

According to the second aspect of the present invention, since the protrusion is provided on the inner wall surface of the crucible to support the skeleton, the guide passage can be sufficiently wide.

In the third aspect of the invention, since a plurality of crucibles are arranged in parallel on one plate-shaped member, it is easy to load the skeleton and the metal for infiltration and to take out the electrode material after infiltration. .

In the invention of claim 4, the excess infiltration metal at the time of infiltration is guided to the inner bottom portion of the crucible by the guide passage provided in the crucible, whereby the excess infiltration metal is skeletonized. To prevent it from adhering to and remaining on the outer peripheral portion.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. Example 1. 1 is a plan view showing an apparatus for manufacturing an electrode material for a vacuum valve according to Embodiment 1 of the present invention, and FIG. 2 is a sectional view of FIG. In the figure, reference numeral 11 denotes a graphite crucible having a bottomed cylindrical shape, and an inner bottom portion of the crucible 11 has a recess 11a,
A groove 11b is provided as a guide flow path.

Next, the operation will be described. Molybdenum powder, niobium powder, and copper powder are weighed at a predetermined ratio, mixed, filled in a mold of a predetermined shape, pressed under a predetermined load to be molded, and then the molded body is sintered. By doing so, the skeleton 2 is manufactured. The skeleton 2 is set in the crucible 11, a lump of copper as the infiltration metal 3 is placed on the skeleton 2, and the infiltration metal 3 is impregnated in the skeleton 2 in a hydrogen atmosphere to make an electrode material. To get

During such infiltration, the excess infiltration metal 3 flowing on the outer peripheral portion of the skeleton 2 is removed by the groove 1 provided in the crucible 11.
Since it flows along 1b into the concave portion 11a, the adhesion to the outer peripheral portion of the electrode material is prevented. Therefore, chucking during machining of the electrode material is facilitated and the workability of the electrode material is improved.

Example 2. Although the groove having the groove 11b is used as the guide flow path in the first embodiment, as shown in FIGS. 3 and 4, the recess 12 is formed in the bottom of the crucible 12 made of graphite.
By providing at least two protrusions 12b for supporting the skeleton 2 on the inner wall surface of the crucible 12, the portion without the protrusions 12b is provided in the guide channel 1
It may be set to 2c. In this case, the guide channel 12
c can be made sufficiently wide.

Example 3. Next, FIG. 3 is a sectional view of a vacuum valve electrode material manufacturing apparatus according to a third embodiment of the present invention. In the third embodiment, a plurality of internal structures of the crucible 11 shown in the first embodiment are provided in a graphite plate member 13, and the skeleton 2 and the infiltration metal 3 can be easily set. In addition, the electrode material after the infiltration can be easily taken out by inverting the plate member 13.

[0020]

As described above, in the vacuum valve electrode material manufacturing apparatus according to the first aspect of the present invention, the inner bottom portion of the crucible located below the skeleton has a recess for receiving an excessive infiltration metal, Since the guide flow path for guiding the excess infiltration metal flowing in the outer peripheral portion of the skeleton to the recess is formed, it is possible to prevent the excess infiltration metal from adhering to the outer peripheral portion of the electrode material for the vacuum valve. Thus, the workability of the electrode material can be improved.

In the apparatus for manufacturing an electrode material for a vacuum valve according to a second aspect of the present invention, since a plurality of protrusions for supporting the skeleton are provided on the inner wall surface of the crucible, the guide channel is formed between the protrusions. In addition to the same effect as the invention of claim 1, the effect that the guide passage can be made sufficiently wide is exhibited.

In the apparatus for manufacturing an electrode material for a vacuum valve according to a third aspect of the invention, a plurality of crucibles are integrally provided by providing a plurality of recesses in one plate-shaped member. In addition to the effects similar to those of the invention, it is easy to load the skeleton and the metal for infiltration, and to take out the electrode material after infiltration, thereby improving workability.

In the method for producing the electrode material for a vacuum valve according to the fourth aspect of the present invention, the excessive infiltration metal during infiltration is guided to the inner bottom portion of the crucible by the guide passage provided in the crucible. Therefore, it is possible to prevent excessive infiltration metal from adhering to the outer peripheral portion of the electrode material for the vacuum valve, and it is possible to improve the workability of the electrode material.

[Brief description of drawings]

FIG. 1 is a plan view showing an apparatus for manufacturing a vacuum valve electrode material according to a first embodiment of the present invention.

FIG. 2 is a sectional view of FIG.

FIG. 3 is a plan view showing a vacuum valve electrode material manufacturing apparatus according to a second embodiment of the present invention.

FIG. 4 is a sectional view of FIG.

FIG. 5 is a sectional view of a vacuum valve electrode material manufacturing apparatus according to a third embodiment of the present invention.

FIG. 6 is a cross-sectional view showing an example of a conventional method for manufacturing a vacuum valve electrode material.

FIG. 7 is a cross-sectional view showing another example of a conventional method for manufacturing a vacuum valve electrode material.

[Explanation of symbols]

2 skeletons, 3 infiltration metal, 11, 12 crucible,
11a, 12a recess, 11b groove (guide flow path), 12
b protruding portion, 12c guide flow path, 13 plate-shaped member.

Claims (4)

(57) [Claims] 1. A metal powder is press-molded into a predetermined shape,
In a manufacturing apparatus of a vacuum valve electrode material, comprising a crucible for accommodating a skeleton obtained by sintering the molded body, and an infiltration metal to be infiltrated into the skeleton, the above-mentioned apparatus located below the skeleton. The inner bottom portion of the crucible is characterized in that a concave portion for receiving an excessive infiltration metal and a guide channel for guiding the excessive infiltration metal flowing in the outer peripheral portion of the skeleton to the concave portion are formed. Equipment for manufacturing vacuum valve electrode materials. 2. The guide channel is formed between the protrusions by providing a plurality of protrusions for supporting the skeleton on the inner wall surface of the crucible. Device for manufacturing vacuum electrode materials. 3. The electrode material for a vacuum valve according to claim 1, wherein a plurality of crucibles are integrally provided by providing a plurality of recesses in one plate member. Manufacturing equipment. 4. A metal powder is press-molded into a predetermined shape,
After obtaining a skeleton by sintering this molded body, the skeleton and the metal for infiltration are housed in a crucible, and in the method for producing a vacuum valve electrode material in which the metal for infiltration is infiltrated in the skeleton, A method of manufacturing an electrode material for a vacuum valve, characterized in that an excessive infiltration metal at the time of immersion is guided to an inner bottom portion of the crucible by a guide passage provided in the crucible.