US 2020/0080840 A1 · METHOD OF EVALUATING DEFORMABILITY OF STEEL PIPE AND METHOD OF MANUFACTURING STEEL PIPE

Abstract

A method of evaluating deformability of steel pipe with which deformability can be evaluated regardless of whether the pitch of pipe expansion is coarse or fine, and a method of manufacturing steel pipe using the method of evaluating deformability, are disclosed. A method of evaluating deformability of steel pipe according to the present invention is a method for evaluating deformability of a steel pipe manufactured through a pipe expanding step performed using a die. The method of evaluating deformability of steel pipe includes an outer shape acquiring step of measuring a shape of the steel pipe to acquire an outer shape, a power spectrum acquiring step of acquiring a power spectrum from a wavy shape of the acquired outer shape, and a determining step of integrating the acquired power spectrum for a predetermined wavelength range and determining deformability on the basis of the resulting integral.

Claims4

Dependent claims

A method of evaluating deformability of steel pipe manufactured through a pipe expanding step performed using a die, the method of evaluating deformability of steel pipe comprising:

an outer shape acquiring step of measuring a shape of the steel pipe to acquire a wavy shape of a outer shape;
a power spectrum acquiring step of acquiring a power spectrum from the acquired wavy shape of the outer shape;
and
a determining step of integrating the acquired power spectrum for a predetermined wavelength range and determining deformability of the steel pipe on the basis of the resulting integral.

1 more element

Dependencies are inferred from the claim text.

Facts

Application

16/469,929Filed 1 Dec 2017

Priority

JP 2016-24660520 Dec 2016

Published

12 Mar 2020

Term ends

Not estimatedThe source records don’t support an estimate.

Classification20 codes

B21C 37/08
Of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes: making tubes with welded or soldered seams
G01B 21/32
Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not…:…
B21C 37/0818
Making tubes with welded or soldered seams: manufacture of tubes by drawing of strip material through dies
B21C 37/30
Of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes: finishing tubes, e.g. sizing, burnishing

Method of evaluating deformability of steel pipe and method of manufacturing steel pipe

Life of this patent

Method of evaluating deformability of steel pipe and method of manufacturing steel pipe

Life of this patent

Abstract

Claims4