Evaluation method of deformation limit of metal plate on sheared surface, crack prediction method and design method of stamping metal die

Abstract

Provides an evaluation method and a prediction method for cracks on the end surface of a sheared material plate due to bending, and provides techniques that should be reflected in the design method of stamping dies. Evaluation Method of Deformation Limit The deformation limit of the metal plate on the sheared surface (10A) when the sheared metal plate (1) is press-formed was evaluated. Evaluation of the deformation limit or prediction of cracks at the sheared plane (10A) based on the index value obtained from the gradient of the two surface strain distributions, the gradient of the two surface strain distributions, in the metal plate subjected to the bending process (1) The gradient of the surface strain distribution in the plate thickness direction (X) of the sheared surface (10A) at the evaluation position among the distributions of strains generated near the boundary between the curved outer surface and the sheared surface (10A) and Gradient of surface strain distribution in the bending ridgeline direction (Y) in the bending process toward the direction away from the shearing process surface (10A).

Description

technical field [0001] The present invention relates to a technique for evaluating and predicting cracks that occur on a sheared surface when a sheared metal plate (material) is formed and processed by press forming including bending, and the ability to suppress cracks in a metal plate based on this technique. The technique of the design method (determination method) of the mold shape of the crack. Background technique [0002] Press forming is one of the representative metal processing technologies. It clamps and presses a metal plate between a pair of metal molds, and molds the metal plate to follow the mold shape of the metal mold, thereby processing the metal plate. The technology to form the desired molded product shape. Moreover, this press molding is used in a wide range of manufacturing fields such as automobile parts, machine parts, building parts, and home appliances. [0003] As one of the main problems of the formability of the press forming, there is the probl...

AI Technical Summary

Problems solved by technology

However, there are few effective prediction methods and evaluation methods for cracks on the end faces of materials caused by combined deformation of bending deformation, tensile deformation, and bending deformation.

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