US 7,065,999 B2 · Bending roll apparatus

Abstract

This invention provides a bending roll apparatus capable of preventing barrel-like deformation of a pipe occurring during a roll bending work and of manufacturing a small diameter elongated pipe. In an apparatus for manufacturing a pipe by pushing rolls to a core roll, feeding a metal sheet to their contact portions and performing a bending work, the bending roll apparatus comprises a core roll formed of a metal and a plurality of push rolls having a surface portion thereof formed of an elastic material and disposed around the core roll. The invention further provides, in a bending roll apparatus, a core roll formed of a metal, a plurality of push rolls formed of a metal and disposed around the core roll, and holding the core roll when a metal sheet is bent, and a guide belt formed of an elastic material, interposed between the core roll and each of the push rolls, contacting on a core roll surface on a side opposite to an entry side of the metal sheet and driven in synchronism with the core roll.

Claims11

Dependent claims

A bending roll apparatus for manufacturing a pipe, comprising:

(a) a core roll formed from a metal having an elongated circumference surface;
(b) a plurality of push rolls formed of an elastic material disposed around the core roll to hold the core roll by holding the core roll at a plurality of positions of the elongated circumference surface of the core roll and to form a contact portion;
(c) a tension roll disposed for tensioning a guide belt;
(d) said guide belt having an inner surface and an outer surface and possessing elasticity, wherein said guide belt is continuous and is wound on the push rolls and on the tension roll by said inner surface and on the core roll by said outer surface such that at least a portion of the elongated circumference surface that is on a side opposite to the tension roll is not wound over by said guide belt, wherein said guide belt is synchronously driven with the core roll, and
wherein a metal sheet can be fed into the contact portion and bent around the core roll to form a shape of pipe.

2 more elements

Dependencies are inferred from the claim text.

Bending roll apparatus

Life of this patent

Bending roll apparatus

Life of this patent

Abstract

Claims11