JP6086708B2 - Stainless steel liquid container - Google Patents

Description

The present invention relates to a liquid container, for example, a stainless steel liquid container used when storing and transporting agricultural chemicals, pharmaceuticals, and non-aqueous electrolytes.

As a liquid container to be stored and transported by injecting non-aqueous electrolytes used in chemicals such as agricultural chemicals and pharmaceuticals, lithium ion secondary batteries, etc., Patent Document 1 describes a resin as a raw material and an outer peripheral portion. There is disclosed a container comprising a bottomed cylindrical container body having a neck portion on which a male screw is formed, and a lid having a bottomed cylindrical shape and a female screw corresponding to the male screw formed on the inner peripheral portion. ing. In this container, after a liquid is injected into the container body, a lid is screwed into the neck portion to seal the liquid in the container body.

  Moreover, in patent document 2, the container for liquid is a bottomed cylindrical container main body which has the neck part by which the external thread is formed in the outer peripheral part using aluminum as a raw material, and a bottomed cylindrical shape in the inner peripheral part using resin as a raw material. It is comprised with the lid | cover in which the internal thread corresponding to the said external thread is formed. Also in the case of this container, after injecting the liquid into the container body, a lid is screwed onto the neck portion to seal the liquid in the container body.

In the liquid containers of Patent Documents 1 and 2, since the container body is made of resin or aluminum, the resin of the base material of the container is softened when the liquid in the container is exposed to an environment of about 90 ° C. for a long time. At the same time, the liquid expands and an internal pressure acts on the container, which may cause deformation or rupture of the container even if the container body is aluminum. Thus, the problem is that the strength is insufficient with respect to the internal pressure.

In order to compensate for the insufficient strength against the internal pressure, stainless steel may be used as the material of the container body. Patent Document 3 describes that an electrolyte for a lithium ion secondary battery was stored in a stainless steel container for 30 days. However, the liquid container made of stainless steel that is usually used is heavy because the plate thickness is about 1 mm, and when used in a narrow space of a normal glove box such as an electrolyte for a lithium ion secondary battery. Had a problem that it was difficult to handle.
In addition, as shown in FIG. 1, the stainless steel liquid container 1 has the bottom 2 and the body 3 and the body 3 and the top plate 4 welded together by a butt joint. Since it is difficult to deform and stabilize welding, there is a problem in that the thickness cannot be reduced and the weight cannot be reduced.

JP 10-197999 A Japanese Patent No. 4918277 JP 2010-092748 A

  As described above, the conventional stainless steel liquid containers have a problem that the mass is heavy and difficult to handle, and the number of parts and manufacturing processes are large, resulting in high costs. The strength against the internal pressure acting on the liquid container can be realized by reducing the plate thickness. However, the conventional stainless steel liquid container 1 shown in FIG. Since the portion 3 and the top plate portion 4 are welded by the butt joint, the butt portion is deformed and is not easily butt if the thickness of each component is not thick to some extent. For this purpose, the thickness of each component is set to about 1 mm, which makes the container itself heavy.

  An object of the present invention is to solve the problems of conventional stainless steel liquid containers and to provide a low-cost stainless steel liquid container that is lightweight and has a reduced number of manufacturing steps.

In order to achieve the object, the stainless steel liquid container of the present invention has a bottomed cylindrical container having a predetermined height and an open end, and a fillet joint that fits into the opening of the cylindrical container. A main body comprising a top plate portion that has a conical shape with both ends opened to be welded, and a neck portion that is welded to a small-diameter opening side of the top plate portion with a fillet joint and has an external thread formed on the outer peripheral portion. It is characterized by comprising a container and a lid formed on the inner periphery with a female screw corresponding to the male screw of the neck and screwed into the neck.
The cylindrical container is formed by inserting an inner mold into a processed product that has been subjected to shallow drawing into a cylindrical shape, and pressing a processing roller that rotates in two directions opposite to the side wall of the processed product. , And the processing roller is moved up and down in the height direction of the processed product to increase the side wall height while reducing the thickness of the side wall of the processed product.

Since the liquid container of the present invention is made of stainless steel, the container is not deformed or ruptured because the strength against internal pressure is high even if the plate thickness is thin.
In addition, it is a cylindrical container in which the bottom and body of the container are integrated, and the top plate part is fitted to the cylindrical container to form a lap fillet joint. Therefore, the stainless steel liquid container welded with a conventional butt joint is used. Can be easily welded, and the cost can be reduced by reducing the number of welding processes. Furthermore, since the thickness of the cylindrical container and the top plate can be reduced, a lightweight stainless steel liquid container can be realized.
The material stainless steel is not particularly limited as long as it has durability against the liquid stored in the container, and austenitic stainless steel or ferritic stainless steel can be selected. Similarly, the material of the lid is not particularly limited as long as it is durable to the liquid stored in the container, and stainless steel, resin, or the like can be selected.

Schematic diagram of a conventional stainless steel liquid container Schematic diagram of a container for liquid according to an embodiment of the present invention The longitudinal cross-sectional view of the container for liquids concerning embodiment of this invention In the manufacturing method of the cylindrical container of the present invention, (a) is a shallow drawing process, and (b) is a schematic diagram related to a rotation process.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 2 is a schematic view of a stainless steel liquid container 1 according to an embodiment of the present invention. FIG. 3 is a longitudinal sectional view of the stainless steel liquid container 1 according to the embodiment of the present invention.

The configuration of the liquid container of the present invention includes a bottomed cylindrical container 5 in which the bottom and the body are integrated and one end is open, and a top that is fitted to the opening side of the cylindrical container 5 and is welded by a lap fillet joint. A body container comprising a plate portion 4 and a neck portion 6 welded to one end of the opening of the top plate portion 4 and having a male screw formed on the outer periphery, and a female screw corresponding to the male screw of the neck portion 6 is provided on the inner periphery. And a lid 7 formed on the surface.
The top plate portion 4 has a conical shape with both ends opened, and the neck portion 6 is welded to the small diameter opening side, and the cylindrical container 5 is welded to the large diameter opening side. A skirt portion 8 for fitting with the cylindrical container 5 is formed on the large-diameter opening side. A welded portion 9b between the neck portion 6 and the top plate portion 4 is a fillet joint around the neck portion 6, and a welded portion 9a between the top plate portion 4 and the cylindrical container 5 causes the top plate portion 4 to be fitted to the cylindrical container 5. It becomes a pile fillet joint.
The thickness of the cylindrical container 5 and the top plate part 4 is not limited as long as it can be lighter than conventional liquid containers made of stainless steel and can withstand the internal pressure of the liquid. preferable.
The welding method is not particularly limited, but it is preferable to perform TIG welding or laser welding.

The manufacturing method of each part of the stainless steel liquid container 1 is as follows. As for the cylindrical container 5, as a first step, as shown in FIG. 12 is shallow drawn into a cylindrical shape. Next, as shown in FIG. 4B, the shallow drawing product 13 into which the inner mold 14 is inserted is rotated, and the two processing rollers 15 are opposed to the side walls 17 of the shallow drawing product 13 respectively. The side wall height is increased while the plate thickness of the side wall 17 is reduced by simultaneously moving the processing roller 15 to the opening side 16 of the shallow drawn product 13 while being pressed. By repeating the operation of these processing rollers 15 while increasing the amount of pressing the processing roller 15 against the side wall 17, the cylindrical container 5 having a predetermined side wall plate thickness and height is obtained.
Moreover, the top plate part 4 is made into a processed product in a conical state by drawing, and is formed by cutting the closed portion of the top of the cone so as to have a predetermined outer diameter. At this time, in the drawing process, the drawing process height is adjusted so that the height of the predetermined top plate part 4 is obtained after the conical top part is cut. Further, the neck portion 6 is formed by cutting a stainless steel pipe having a predetermined outer diameter into a predetermined length and applying a male screw having a pitch and a screw height necessary for the outer periphery by cutting or rolling.
The manufacturing method of the lid 7 is not particularly limited. For example, when a hexagonal nut shape is made of stainless steel, a round bar-shaped material is cut to a predetermined height, and the male part of the neck 5 is formed on the side wall of the recess or the recess. A female screw corresponding to the screw may be processed by cutting. Moreover, when using resin as a raw material, you may shape | mold a lid | cover by injection molding or cutting.

Examples of the present invention will be described below. As materials, the top plate portion 4, the cylindrical container 5 and the neck portion 6 of the stainless steel liquid container 1 were made of SUS304, and the lid 7 was made of polypropylene.
The cylindrical container 5 has an outer diameter of 65 mm, a height of 185 mm, a bottom plate thickness of 0.4 mm, and a side wall plate thickness of 0.2 mm. The top plate part 4 has a thickness of 0.4 mm, an inner diameter of the large diameter side of 65 mm, an outer diameter of the small diameter side of 20 mm, an inclination angle of 45 °, a height excluding the skirt part 8 of 22.9 mm, and the skirt part The height of 8 was 5 mm. The neck 6 had a height of 30 mm, an inner diameter of 16 mm, and an M20 male screw formed on the outer periphery. The lid 7 had a columnar shape, a height of 40 mm, an outer diameter of 30 mm, and a structure in which a concave portion having a depth of 30 mm on the inner side and an M20 female screw formed on the side wall was provided.

  The cylindrical container 5 is manufactured by forming a disk having a thickness of 0.4 mm and an outer diameter of 205 mm, and forming a shallow drawn product 13 having a height of 30 mm with a punch 10 having a diameter of Φ64.2 mm and a die 11 having an inner diameter of Φ65 mm. An inner die 14 having a diameter of 64.2 mm and a height of 200 mm is inserted into the processed product 13, and disposed at opposed positions around the side wall of the shallow drawn product 13. The diameter is 80 mm, the plate thickness is 16 mm, and the curvature radius is 8 mm. A pair of processing rollers 15 subjected to the above R was rotated until a predetermined dimension was reached. In the rotation processing by the processing roller 15, the rotational speed of the shallow drawing product 13 was 1000 rpm, the processing roller 15 was driven rotation, the feed rate was 300 mm / min, and the amount of pressing once was 0.05 mm.

The top plate part 4 is a cone-shaped punch having a base of Φ65 mm and an inclination angle of 45 ° and a die having an inner diameter of Φ65.8 mm, and the base side has an inner diameter of Φ65 mm, a height of 32.9 mm, and an inclination angle of 45 ° and a height of the skirt part 8. A processed product having a thickness of 5 mm was formed, and a portion having a height of 10 mm was cut from the circular top of the processed product.
The neck 6 was formed by cutting a SUS304 pipe having an outer diameter of 20 mm and a thickness of 2 mm to a height of 30 mm, and cutting a male screw of M20 on the outer periphery. The lid 7 was formed by forming a recess having a depth of 30 mm and a diameter of 20 mm on the inside of a cylindrical product having a height of 40 mm and an outer diameter of 30 mm using injection molding, and forming an M20 female screw on the side wall of the recess by cutting. .

  The manufactured cylindrical container 5 and the top plate part 4 were fitted by a skirt part 8, and the fitting part was joined and assembled by a TIG welding method. Next, the neck portion 6 was placed on the top plate portion 4 and assembled by TIG welding to be integrated.

  500 cc of a lithium ion battery electrolyte based on lithium hexafluorophosphate is injected into a stainless steel liquid container 1 manufactured by the above method, and the container state is evaluated by leaving it at 90 ° C. for one month. did. As a result of the evaluation, no abnormality such as deformation or liquid leakage was found in the stainless steel liquid container 6.

  The stainless steel liquid container according to the present invention is suitable for use as, for example, a container for transporting a non-aqueous electrolyte.

DESCRIPTION OF SYMBOLS 1 Stainless steel liquid container 2 Bottom part 3 Body part 4 Top plate part 5 Cylindrical container 6 Neck part 7 Lid 8 Skirt part 9, 9a, 9b Welding part 10 Punch 11 Die 12 Plate presser 13 Shallow drawn product 14 Inner die 15 Processing roller 16 Opening of shallow drawing product 17 Side wall

Claims (3)

A bottomed cylindrical container in which the bottom and the body are integrated and one end is open, and a truncated cone shape having both ends open. A skirt is formed in the large-diameter opening , and the skirt is formed in the cylindrical container. A main body container comprising: a top plate portion that is fitted; and a neck portion that is welded to the small-diameter opening side of the top plate portion and has a male screw formed on the outer peripheral portion;
A female screw corresponding to the male screw of the neck is formed on the inner periphery and screwed into the neck ,
The main body container is stainless steel,
The cylindrical container is configured such that the thickness of the side wall is thinner than the thickness of the bottom,
The top plate portion and the cylindrical container are liquid containers in which a fitting portion between the skirt portion and the opening side of the cylindrical container is joined by fillet welding . Liquid container according to claim 1, wherein the neck portion and the front SL top plate are joined by fillet welding. It is a manufacturing method of the container for liquids according to claim 1 or 2,
An inner mold is inserted into a processed product obtained by shallow drawing of the cylindrical container into a cylindrical shape, and a processing roller rotating from two directions facing the side wall of the processed product is pressed to rotate the processed product and to perform the processing. up and down movement of the roller in the height direction of the workpiece, while allowed reducing the thickness of the side wall of the workpiece comprising the steps of producing by a method of increasing the side wall height, the manufacturing method of the liquid for containers.

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