Method for manufacturing high-pressure tank and mandrel for use in method for manufacturing high-pressure tank

Patent metadata

Field	Value
Publication number	US-11511498-B2
Application number	US-202117357462-A
Country	US
Kind code	B2
Filing date	Jun 24, 2021
Priority date	Jul 31, 2020
Publication date	Nov 29, 2022
Grant date	Nov 29, 2022

Abstract

A method for manufacturing a high-pressure tank including a reinforcing layer in which rims of both ends of a tubular member and rims of a pair of dome members are joined to overlap each other in a radial direction includes producing the dome members and producing the tubular member. The producing of the dome members includes producing a wound body on a mandrel, curing a resin contained in the wound body, shaving the wound body after the resin is cured to reduce, toward a split line, thicknesses of the rims of the dome members to be obtained by splitting the wound body, splitting the shaved wound body into the dome members by cutting the wound body along the split line, and demolding the dome members from the mandrel.

First claim

What is claimed is:

1. A method for manufacturing a high-pressure tank including a reinforcing layer in which rims of both ends of a tubular member and rims of a pair of dome members are joined to overlap each other in a radial direction, the method comprising:
producing the dome members; and
producing the tubular member, wherein the producing of the dome members includes:
a step of producing a wound body having a spherical shell shape on a mandrel while rotating the mandrel;
a step of curing a resin contained in the wound body;
a step of shaving the wound body after the resin is cured while rotating the mandrel to reduce, toward a split line circling the wound body, thicknesses of the rims of the dome members to be obtained by splitting the wound body;
a step of splitting the shaved wound body into the dome members by cutting the wound body along the split line; and
a step of demolding the dome members from the mandrel.

2. The method for manufacturing the high-pressure tank according to claim 1 , wherein:
the wound body is cut by using a cutting blade, in the step of splitting the wound body into the dome members; and
an outer peripheral surface of the mandrel has an undercut groove adapted for relief of the cutting blade at a position along the split line.

3. The method for manufacturing the high-pressure tank according to claim 1 , wherein, in the producing of the tubular member, the tubular member is produced to gradually reduce thicknesses of the rims of both ends of the tubular member in an axial direction of the tubular member.

Assignees

• Toyota Motor Co Ltd

Inventors

• Takeda Yohei
• Fujii Manabu

Classifications

• F17C2223/0123

  gaseous, e.g. CNG, GNC · CPC title

• B29C70/32 Primary

  on a rotating mould, former or core · CPC title

• F17C2203/0621

  with three layers · CPC title

• F17C2203/0673

  Polymers · CPC title

• F17C2209/2163

  with a mandrel · CPC title