Method for predicting springback amount and method for bending deformed reinforcing bar

Patent metadata

Field	Value
Publication number	US-12276641-B2
Application number	US-202217931849-A
Country	US
Kind code	B2
Filing date	Sep 13, 2022
Priority date	Sep 17, 2021
Publication date	Apr 15, 2025
Grant date	Apr 15, 2025

Abstract

There are provided a method for predicting a springback amount and a method for bending a deformed reinforcing bar including: supplying the deformed reinforcing bar bending the supplied deformed reinforcing bar, and subsequently measuring a first bending angle in a state of releasing a bending force on the deformed reinforcing bar; further bending the reinforcing bar from which the bending force has been released, and subsequently measuring a second bending angle in a state of releasing the bending force; and predicting a relationship between the bending angle and the springback amount by using the measurement results after executing the further bending once or a plurality of times, in which the bending angle is greater for subsequent steps.

First claim

What is claimed is:

1. A method for predicting a springback amount associated with a target bending angle during a bending process of a deformed reinforcing bar to the target bending angle by using a reinforcing bar bending device including a fulcrum member configuring a fulcrum in the bending process and an effort member rotated around the fulcrum member, the method comprising:
supplying the deformed reinforcing bar to the reinforcing bar bending device;
bending the deformed reinforcing bar by rotating the effort member to a predetermined bending angle, and subsequently measuring a first bending angle of the deformed reinforcing bar in state of releasing a bending force of the effort member on the deformed reinforcing bar;
further bending deformed reinforcing bar from which the bending force of the effort member has been released to another bending angle, and subsequently measuring a second bending angle of the deformed reinforcing bar in a state of releasing the bending force of the effort member on the deformed reinforcing bar; and
predicting the springback amount associated with the target bending angle based on the first bending angle and the second bending angle,
wherein the another bending angle is greater than the predetermined bending angle,
the deformed reinforcing bar has a cross-sectional shape in which a first portion of an outer circumference of the deformed reinforcing bar is formed higher than a second portion of the outer circumference of the deformed reinforcing bar,
the first portion of the outer circumference of the deformed reinforcing bar includes a rib that extends in a longitudinal direction of the deformed reinforcing bar, and
supplying the deformed reinforcing bar to the reinforcing bar bending device includes positioning the deformed reinforcing bar on a reference surface portion of the reinforcing bar bending device such that the rib is oriented in a predetermined orientation to the reference surface portion, the reference surface portion forming a reference plane that determines a bending direction during bending of the deformed reinforcing bar.

2. The method according to claim 1 , wherein
the predetermined bending angle and the another bending angle are determined based on the target bending angle.

3. A method for bending a deformed reinforcing bar by using the method for predicting a springback amount according to claim 1 , comprising:
bending another deformed reinforcing bar to a set bending angle which is determined based on the target bending angle and the predicted springback amount, by using the reinforcing bar bending device that is used for predicting the springback amount.

4. The method according to claim 1 , wherein
in supplying the deformed reinforcing bar to the reinforcing bar bending device, the deformed reinforcing bar is positioned on the reference surface portion of the reinforcing bar bending device such that the rib is oriented in a direction orthogonal to the reference surface portion.

5. The method according to claim 3 , further A method for bending a deformed reinforcing bar to a target bending angle using a reinforcing bar bending device including a fulcrum member configuring a fulcrum in a bending process and an effort member rotated around the fulcrum member, the method comprising:
supplying the deformed reinforcing bar to the reinforcing bar bending device;
bending the deformed reinforcing bar by rotating the effort member to a predetermined bending angle, and subsequently measuring a first bending angle of the deformed reinforcing bar in state of releasing a bending force of the effort member on the deformed reinforcing bar;
further bending the deformed reinforcing bar from which the bending force of the effort member has been released to another bending angle, and subsequently measuring a second bending angle of the deformed reinforcing bar in a state of releasing the bending force of the effort member on the deformed reinforcing bar;
predicting a springback amount associated with the target bending angle based on the first bending angle and the second bending angle; and
further bending the deformed reinforcing bar to a set bending angle using the reinforcing bar bending device, the set bending angle being determined based on the target bending angle and the predicted springback amount,
wherein the deformed reinforcing bar a cross-sectional shape in which a first portion of an outer circumference of the deformed reinforcing bar is formed higher than a second portion of the outer circumference of the deformed reinforcing bar,
the another bending angle is greater than the predetermined bending angle,
the first portion of the outer circumference of the deformed reinforcing bar includes a rib that extends in a longitudinal direction of the deformed reinforcing bar, and
supplying the deformed reinforcing bar to the reinforcing bar bending device includes positioning the deformed reinforcing bar on a reference surface portion of the reinforcing bar bending device such that the rib is oriented in a predetermined orientation to the reference surface portion, the reference surface portion forming a reference plane that determines a bending direction during bending of the deformed reinforcing bar.

6. The method according to claim 5 , wherein
in supplying the deformed reinforcing bar to the reinforcing bar bending device, the deformed reinforcing bar is positioned on the reference surface portion of the reinforcing bar bending device such that the rib is oriented in a direction orthogonal to the reference surface portion.

Assignees

• The Doshisha
• Toyo Kensetsu Kohki Co Ltd

Inventors

• Sasada Masahiro
• Matsukuma Ikuho
• Higaki Satoshi

Classifications

• G01N3/06 Primary

  Special adaptations of indicating or recording means · CPC title

• G01N2203/0023

  Bending · CPC title

• B21D7/022

  over a stationary forming member only · CPC title

• G01N2203/028

  One dimensional, e.g. filaments, wires, ropes or cables · CPC title

• G01N3/20 Primary

  by applying steady bending forces (G01N3/26, G01N3/28 take precedence) · CPC title