JP2650433B2 - Manufacturing method of powder container - Google Patents

Description

The present invention relates to a method for manufacturing a container for mainly storing or discharging a radioactive substance powder, and particularly relates to a method for manufacturing a container having a bottomed cylindrical container body. The present invention relates to a method for manufacturing a powder container in which radial fins are formed toward the center.

[Conventional technology]

In general, when storing powder that generates internal heat due to self-decay heat even during storage, such as radioactive substance powder, for example, plutonium dioxide (PuO ₂ ), a material such as aluminum having good heat conductivity is used. Uses a storage container.

In addition, it is necessary to prevent the exposure of workers to the handling of radioactive material, especially when handling or filling the container with radioactive material powder, and safety and strict quality control of radioactive material powder Is emphasized.

[Problems to be solved by the invention]

By the way, heretofore, as this type of powder container, there is known a powder container in which radial fins are formed from the inner wall of a bottomed cylindrical container body toward the center, and a lid is detachably attached to an upper portion of the container body. (See Japanese Utility Model Laid-Open No. 56-172518).

However, in the above-mentioned conventional powder container, since fins for heat removal are formed in the container main body, there is a problem that it is difficult to manufacture and it is difficult to obtain a product of desired quality.

That is, as a method of manufacturing the container body, a method of assembling each part by welding, brazing or the like, or a method of integrally manufacturing by casting can be considered, but in the former method, joining is performed. It is difficult to ensure the reliability of the part and it is necessary to perform various inspections at the time of manufacture, while in the latter method, it is easy to form a hollow part in the container body, it is difficult to obtain sufficient strength, There is a problem that the production cost increases because the mold becomes expensive.

The present invention has been made in view of the above circumstances, and an object of the present invention is to make it possible to easily and reliably manufacture a bottomed cylindrical container body provided with fins therein, and to obtain high quality. It is an object of the present invention to provide a method for producing a powder container which can produce a smooth product at a relatively low cost.

[Means for solving the problem]

In order to achieve the above object, a method for manufacturing a powder container of the present invention uses a mandrel having a tapered tip surface to form a bottomed cylindrical forged body having fins inside by forging. Then, after cutting and removing the upper part of the fin in the forged body, a neck is formed on the upper part of the forged body.

[Action]

In the method for manufacturing a powder container of the present invention, by forming a bottomed cylindrical forged body by forging using a mandrel having a tapered tip surface, radial fins are integrally formed therein. While forming, while forming a mortar-shaped inclined surface on the inner bottom surface of the forged body, and obtain good surface roughness,
By cutting off the upper part of the fin of the forged body and drawing the neck, a product having sufficient strength and quality is obtained.

〔Example〕

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 6.

FIG. 1 to FIG. 4 show a procedure for manufacturing a container body. As shown in FIG. 5, the powder container manufactured by this procedure has
The diameter is reduced to a funnel shape to form a shoulder portion 2, and the shape is narrowed to form a neck portion 3. A screw 4 is formed on the outer periphery of the neck 3. Further, two types of long and short radial fins 5, 6 are alternately formed inside the container body 1 from the inner wall below the shoulder portion 2 toward the center. As shown in FIG. 6, the dimensions of these fins 5 and 6 are such that the diameter of the suction pipe insertion space at the center is d1,
Assuming that the diameter of the inscribed circle at the tip of 6 is d2, d2 = (0.6 to 1.0) × d1 and the diameter of the inscribed circle of the side walls of the long and short fins 5, 6 and the inner wall of the container body 1 is d3, (0.8-1.0) × d2. The range of these dimension settings is set in consideration of the heat removal effect by the fins 5 and 6 and smooth maintenance of powder suction (flow of powder). Further, a tapered portion 7 is formed at the upper central side of these fins 5. Further, the inner bottom surface of the container body 1 is formed with an inclined surface 8 which descends toward the center.

A lid 9 is screwed into the screw portion 4 of the container body 1, and through holes 10 are formed in the center of the lid 9 in the vertical direction. A pressure equalizing element (filter) 11 made of sintered metal is mounted in the through hole 10 by a retaining ring 12. A flange 13 is formed at the lower end of the lid 9, and an O-ring 14 is mounted inside the lid 9 at a position facing the neck 3 of the container body 1.

The container body 1 and the lid 9 are each formed of an aluminum alloy. In addition, the odor of the inclined surface 8 is preferably 1.5 / 100 or more when it is set from the viewpoint of ease of production (drawing) and good surface roughness of the container, and facilitates dispensing of internal substances. In order to do so, it is desirable to use 1/10 or more.

In the case of manufacturing the container body 1 configured as described above, first, as shown in FIG. 1, a cylindrical forged body 15 with a bottom is obtained by drawing (forging) the inner fins 5 and 6 together. . In this case, since the tip end surface 17 of the mandrel 16 used in the processing is formed in a tapered shape, it can be processed smoothly, the surface roughness of the obtained forged body 15 is good, and the inner bottom surface is The forged body 15 to be the inclined surface 8 is reliably manufactured. Next, the upper portions of the fins 5 and 6 of the forged body 15 are removed by cutting as shown in FIG. Subsequently, as shown in FIG. 3, the shoulder 2 and the neck 3 are formed on the upper part of the forged body 15 by drawing. Further, after the heat treatment, a screw portion 4 is formed on the outer periphery of the neck portion 3 by machining as shown in FIG.

On the other hand, after forming the outer shape by forging, the lid 9 is subjected to a heat treatment, and then a screw portion, a through hole, and the like are formed by machining, and further, the equalizing element 11, the retaining ring 12, the 0 ring 14, and the like are formed. Attach and complete.

In the powder container comprising the container body 1 and the lid 9 obtained in this manner, when the powdered heat generating substance is stored inside, the two kinds of long and short fins 5 and 6 ensure that the powder is outside the container. In addition to performing heat removal, the fins 5 and 6 do not obstruct suction when the internal substance is sucked by a pipe or the like, and the inner bottom surface of the container body 1 is formed as an inclined surface 8 and the surface roughness is reduced. Is good, the internal substance flows smoothly toward the center and is sucked and discharged to the outside.

〔The invention's effect〕

As described above, the method for manufacturing a powder container of the present invention uses a mandrel having a tapered tip surface.
By forging, a bottomed cylindrical forged body having fins therein is formed, and then, after cutting and removing the upper part of the fin in the forged body, a neck is formed on the upper part of the forged body. By forming a bottomed cylindrical forged body by forging using a mandrel whose surface is tapered, radial fins are integrally formed inside,
While forming a mortar-shaped inclined surface on the inner bottom surface of the forged body and obtaining good surface roughness, the upper part of the fin of the forged body is cut off, and the neck portion is squeezed to obtain sufficient strength and quality. By obtaining the secured product, a bottomed cylindrical container body provided with fins therein can be easily and reliably manufactured, and a highly reliable product can be manufactured relatively inexpensively.

[Brief description of the drawings]

1 to 6 show an embodiment of the present invention.
1 is a cross-sectional view of a forged body, FIG. 2 is a cross-sectional view of a state in which an upper portion of a fin is cut off, FIG. 3 is a cross-sectional view showing drawing of a neck portion, and FIG. FIG. 5 is a front view showing an example of the powder container, and FIG. 6 is a cross-sectional view for explaining long and short fins. 1 ... container body, 3 ... neck, 5, 6 ... fin, 8 ...
Inclined surface, 15 ... forged body, 16 ... mandrel, 17 ... tip surface.

Claims (1)

(57) [Claims] 1. A powder comprising a plurality of radial fins formed from the inner wall of a cylindrical container body with a bottom toward the center, and an inclined surface descending toward the center on the inner bottom surface of the container body. In the method of manufacturing a container, a forged body having a bottom is formed by forging using a mandrel having a tapered tip surface, and then the upper part of the fin in the forged body is cut. A method for manufacturing a powder container, comprising: forming a neck portion on an upper part of the forged body after removing the forged body.