Bellows and method for manufacturing same

Patent metadata

Field	Value
Publication number	US-9422933-B2
Application number	US-201214117950-A
Country	US
Kind code	B2
Filing date	Apr 19, 2012
Priority date	May 18, 2011
Publication date	Aug 23, 2016
Grant date	Aug 23, 2016

Abstract

A conductive coating layer 2 a , 2 b is formed on at least one of an inner peripheral side and an outer peripheral side of a base body 2 of bellows 1 by diffusion-bonding. Regarding the diffusion-bonding, the flat conductive coating layer 2 a , 2 b is layered on at least one end surface side of the plate-shaped base body 2 , and these base body 2 and conductive coating layer 2 a , 2 b are diffusion-bonded. After forming this diffusion-bonded multilayer member into a tubular body by a drawing process, a side wall of the tubular body is formed into a bellows shape. With these processes, it is possible to obtain the bellows that has the conductive coating layer having a more uniform thickness on the base body of the bellows and has extremely good characteristics (the mechanical characteristics and the electric characteristics).

First claim

The invention claimed is:

1. A method for manufacturing bellows comprising:
arranging a flat conductive coating layer on at least one end surface side of a plate-shaped base body in layer;
diffusion-bonding the base body and the conductive coating layer;
forming a diffusion-bonded multilayer member into a tubular body by a drawing process; and
forming a side wall of the tubular body into a bellows shape.

2. The method for manufacturing the bellows as claimed in claim 1 , wherein:
the base body is formed from a nonmagnetic stainless material.

3. The method for manufacturing the bellows as claimed in claim 1 , wherein:
the conductive coating layer is formed from a conductive material that contains at least one of copper, silver and gold.

4. Bellows manufactured by the method of claim 1 .

5. Bellows for a vacuum casing, which divides an inside of the vacuum casing into a vacuum chamber and an atmospheric chamber and keeps the vacuum chamber airtight, comprising:
a base body; and
a conductive coating layer,
wherein the base body and the conductive coating layer are bonded by diffusion-bonding, and
wherein a thickness of the conductive coating layer is uniform.

6. The bellows for the vacuum casing as claimed in claim 5 , wherein:
a variation of the thickness of the conductive coating layer is an average of ±1% or less.

7. Bellows for a vacuum casing, which divides an inside of the vacuum casing into a vacuum chamber and an atmospheric chamber and keeps the vacuum chamber airtight, comprising:
a base body;
a conductive coating layer; and
a diffusion-bond configured to bond the base body and the conductive coating layer,
wherein a thickness of the conductive coating layer is uniform.

8. The bellows for the vacuum casing as claimed in claim 7 , wherein:
a variation of the thickness of the conductive coating layer is an average of ±1% or less.

Assignees

• Tatsumi Toshinori
• Takahashi Eiichi
• Meidensha Electric Mfg Co Ltd

Inventors

• Tatsumi Toshinori
• Takahashi Eiichi

Classifications

• Y10T29/49877

  of flexible wall, expansible chamber devices [e.g., bellows] · CPC title

• F16J3/047

  Metallic bellows · CPC title

• F04B45/02 Primary

  having bellows · CPC title

• F16J3/041 Primary

  Non-metallic bellows · CPC title

• H01G5/01

  Details · CPC title