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Method for Bending Metal Sheet to Achieve High Angle Accuracy

a technology of angle accuracy and metal sheet, applied in the direction of material strength using steady bending force, instrumentation, design optimisation/simulation, etc., can solve the problems of inability to use the same die, large restrictions on such methods, unstable accuracy of forming structural members, etc., to achieve accurate control of angle and control of bending of metal sheet

Inactive Publication Date: 2016-10-06
SHANGHAI JIAO TONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a method for controlling the bending of a metal sheet while accurately controlling an angle at which to bend the metal sheet. This method uses a CAE simulation technique to obtain a relational database on the relationship among the amounts of springback, forming angles, material performances, and sheet thicknesses of metal sheets by simulating bending processes. The amount of springback can be known before the material is actually bent, and compensation for the springback can be made to meet accuracy requirements. The forming angle can be automatically controlled, and both the automation level and forming accuracy are high. The finite element simulation model can be accurately simulating actual forming conditions, and the predicted value can almost equal to the actual value. The method improves automation level and forming accuracy. The present invention using the flow stress curve as a material parameter can achieve higher simulation accuracy and efficiency.

Problems solved by technology

This makes the accuracy of forming structural members unstable.
However, a great restriction is imposed on such method.
The same die cannot be used when the forming angle of products is changed, or when the size of products is increased.
This results in a very large production cycle very and very high costs.
This method requires so many manual operations, and cannot be implemented with an automated control.
Furthermore, dies used for such method are complicated, and after used for long time, the dies are deformed.
However, the rigidity of the thus-designed larger dies cannot be secured, and the dies maybe warped or deformed during the forming processes, adversely affecting the forming quality.

Method used

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  • Method for Bending Metal Sheet to Achieve High Angle Accuracy
  • Method for Bending Metal Sheet to Achieve High Angle Accuracy
  • Method for Bending Metal Sheet to Achieve High Angle Accuracy

Examples

Experimental program
Comparison scheme
Effect test

example 1

Bending Example 1

[0081]The performance parameter of a material C obtained by the reverse-engineering is sent to a control unit of the bending machine. The control unit draws a flow stress curve based on the mechanical parameter of the material to be processed, and compares the thus-drawn flow stress curve with the flow stress curves of the materials stored in the database. If the flow stress curve of the material A basically agrees with the flow stress curve of the material C, and the error between the two curves is less than a second threshold value, for example 1%, the control unit understands the material A in the database is similar to the material C and selects the material parameter of the material A as a reference material parameter of the material C. Since the bending performance of a material depends on the mechanical performance of the material, the bending performance of the material C should be similar to the bending performance of the material A. Although the present in...

example 2

Bending Example 2

[0085]The performance parameter of the material X obtained by the reverse-engineering is sent to the control unit of the bending machine. The control unit draws a flow stress curve based on the mechanical parameter of the material to be processed, and compares the thus-drawn flow stress curve with the flow stress curves of the materials stored in the database. If the control unit finds no material to meet the error requirements in the database, that is to say, if a reference material parameter, between which and the material parameter of the metal sheet X to be processed an error is less than the second threshold value, does not exist in the relational database, the control unit understands that the performances of the materials stored in the relational database is very different from the performance of the material X to be processed. In this case, the bending process to be performed on the material X to be processed needs to be simulated by reuse of the finite elem...

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Abstract

A method for controlling the bending of a metal sheet includes the steps of: establishing a relational database on a relationship among material parameters, forming angles, amounts of springback, and amounts of press of an upper die; blanking and reverse-engineering a material parameter of a metal sheet to be processed; comparing the material parameters in the relational database with the material parameter of the metal sheet to be processed which is obtained by the reverse-engineering; and performing an bending operation.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a metal sheet processing technology, and specifically to a method for increasing accuracy of bending a metal sheet.[0003]2. Description of the Related Art[0004]Bending is an important method for processing metal sheets in the industrial production. In a process of producing metal sheet members, the angle of the bent metal sheet increases due to the elastic recovery of the metal material. In addition, there are large variations in performance among raw materials with different specifications and from different makers, making the amounts of springback of the materials after bending differ. This makes the accuracy of forming structural members unstable. For this reason, an increase in the forming accuracy by effectively avoiding the springback is very important in the forming process.[0005]Against this background, CN203140585U discloses a method for increasing the accuracy of forming stampe...

Claims

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Application Information

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IPC IPC(8): B21D5/00
CPCB21D5/004B21D5/02G01N3/20G01N2203/0216G01N2203/0218G01N2203/0282G06F2113/24G06F30/00G06F30/23G06F30/20
Inventor ZHAO, ZHENZHUANG, XINCUNZHAO, XINGFENGTANAKA, HIDEAKI
Owner SHANGHAI JIAO TONG UNIV