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

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.

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...

AI Technical Summary

Problems solved by technology

However, the biggest problem with the theoretical calculation method is that some assumptions and simplifications are made before obtaining the final theoretical formula, which leads to certain differences with the actual working conditions. Various factors and conditions can be considered as much as possible, which is closer to the actual production process, so more accurate quantitative analysis can be performed on the forming limit problem

The above analysis is mainly aimed at ordinary equal-thickness plates, but there is no report on the establishment and use of forming curves for rolling differential-thickness plates.

Images