Method for establishing forming limit field of rolled variable-thickness plates

A technology of sheet forming and forming limit, applied in the field of forming
CN112364549APending Publication Date: 2021-02-12GUANGDONG UNIV OF PETROCHEMICAL TECH
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
GUANGDONG UNIV OF PETROCHEMICAL TECH
Publication Date
2021-02-12

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Abstract

The invention discloses a method for establishing a forming limit field of a rolled variable-thickness plate, which is applied to the technical field of forming processing, and comprises the followingspecific steps of: dividing a different-thickness plate by adopting a partition discrete method, and fitting primary and secondary strain values of a forming limit point under each thickness by utilizing a least square method to obtain a forming limit curve under the thickness; and after forming limit curves under all thicknesses are obtained, solving a corresponding main strain value by utilizing the secondary strain value under each thickness, and obtaining a formula of a forming limit field by taking the secondary strain value as x, the thickness as y, the main strain value as z and the thickness as an interpolation variable. According to the method, prediction and evaluation of the forming limit of the different-thickness plate are realized.
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Description

technical field

[0001] The invention relates to the technical field of forming processing, and more specifically relates to a method for establishing a forming limit field of a rolling variable-thickness plate. Background technique

[0002] Due to the difference in the rolling reduction in different regions of the differential thickness plate during the rolling process, the material properties of each part of the differential thickness plate are different, and the thickness is not uniform. The current research results cannot solve the problem of the differential thickness plate at room temperature. The problem of forming limit prediction and determination during lower forming has also become a major bottleneck in the practical application of differential thickness plates.

[0003] Generally, the methods for establishing the forming limit are mainly divided into three categories: experimental determination method, theoretical calculation method and numerical simulation method...

Claims

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