초록 ▼

The present invention is aimed at providing a method for producing a vacuum-insulated double container that exhibits a remarkable and heretofore unobtainable operating effect. The invention provides a method for producing a vacuum-insulated double container by placing a titanium internal cylinder (2

The present invention is aimed at providing a method for producing a vacuum-insulated double container that exhibits a remarkable and heretofore unobtainable operating effect. The invention provides a method for producing a vacuum-insulated double container by placing a titanium internal cylinder (2) into a titanium external cylinder (1) via a space section (S), and using the space section (S) between the external cylinder (1) and the internal cylinder (2) as a vacuum-insulating space section, the method comprising the steps of degassing the space section (S) of a workpiece (3) that includes the external cylinder (1) and the internal cylinder (2), and vacuum sealing a degassing hole while the workpiece (3) is heated in a vacuum heating furnace (6); and then providing concavoconvex portions (4, 5) to a surface of the recrystallized external cylinder (1) and the internal cylinder (2) by placing the workpiece (3) in an atmospheric-pressure environment.

대표청구항 ▼

1. A method for producing a vacuum-insulated double container by placing a titanium internal cylinder into a titanium external cylinder via a space section, and using the space section between the external cylinder and the internal cylinder as a vacuum-insulating space section, the method comprising

1. A method for producing a vacuum-insulated double container by placing a titanium internal cylinder into a titanium external cylinder via a space section, and using the space section between the external cylinder and the internal cylinder as a vacuum-insulating space section, the method comprising the steps of: heating and recrystallizing a workpiece that includes the external cylinder and internal cylinder in a vacuum heating furnace, degassing the space section of the workpiece and vacuum sealing a degassing, hole; andproviding concavoconvex portions to a surface of the recrystallized external cylinder and internal cylinder by rapidly cooling the workpiece in an atmospheric-pressure environment. 2. The method for producing a vacuum-insulated double container according to claim 1, wherein the rapid cooling is a process including cooling the workpiece with nitrogen gas at a point in time at which the temperature inside the vacuum heating furnace is about 700° C. or less. 3. The method for producing a vacuum-insulated double container according to claim 2, wherein the workpiece is heated to about 800° C. or greater, and the temperature is then lowered to induce recrystallization. 4. The method for producing a vacuum-insulated double container according to claim 1, wherein the workpiece is heated to about 800° C. or greater, and the temperature is then lowered to induce recrystallization. 5. A method for producing a vacuum-insulated double container by placing a titanium internal cylinder into a titanium external cylinder via a space section, and using the space section between the external cylinder and the internal cylinder as a vacuum-insulating space section, the method comprising the steps of: obtaining a recrystallized workpiece that includes the external cylinder and internal cylinder by repeating a heating/cooling/normal pressure process of heating the workpiece in a vacuum heating furnace to a recrystallization temperature, cooling the workpiece, and placing the workpiece into an atmospheric-pressure environment a plurality of times to obtain the recrystallized workpiece, wherein normal pressure is 1 atm;subsequently degassing the space section of the recrystallized workpiece, and vacuum sealing a degassing hole while the workpiece is heated in the vacuum heating furnace; andproviding concavoconvex portions to a surface of the external cylinder and the internal cylinder by placing the workpiece in an atmospheric-pressure environment.