Method for determination of forming limit curve of sheet metal

Abstract

The invention relates to a method for determination of a forming limit curve of sheet metal. A piece of stamping shaping CAE simulation analysis software DYNAFORM is used for simulation of stamping forming of a piece of sheet metal to be detected, thereby determining a FLD 0 value in a shaping limit graph; and the forming limit curve of the sheet metal to be detected is calculated out though the Keeler formula. Compared with the prior art, the method for determination of the forming limit curve of sheet metal provided by the invention is simple, feasible and has low cost and small error.

Description

technical field [0001] The invention relates to a method for determining the plastic forming performance index of a metal plate—the forming limit curve. Background technique [0002] The basic mechanical performance index of sheet metal can only make a qualitative and comprehensive half evaluation of sheet metal formability. For the forming of parts with complex shapes, the actual deformation of each part of the blank cannot be fully described and measured with the basic mechanical performance indicators. The forming limit curve (Forming Limit Curves - abbreviated as FLC) focuses on each deformation part of the complex part, and it is the local instability limit strain principal strainε of the sheet metal under different strain paths 1 and secondary strain ε 2 composed of striped curves. FLD (Forming Limit Diagram - abbreviated as FLD, which has the same physical meaning as FLC) comprehensively and intuitively reflects the formability of sheet metal under different strain...

AI Technical Summary

Problems solved by technology

[0009] 3. After the stamping deformation of the metal sheet, due to the contact and extrusion between the metal sheet and the punch and die during the forming process, the electrochemical corrosion mesh at the part with

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