Forming simulation method, forming simulation apparatus, forming simulation program, and recording medium

摘要

The present invention provides a press forming simulation method using a finite element method for a sheet metal, in which a deformation state of a pressing tool is represented with high accuracy by superimposing at least one natural mode, for the surface shape of the pressing tool, in a no-load state.

主权项

1. A press forming simulation method using a finite element method for a sheet metal, the method comprising:
calculating a deformation state of a surface shape of a pressing tool with a computer by superimposing at least one natural mode on the surface shape, in a no-load state, using a formula:z⁡(x,y)=z0⁡(x,y)+∑i=0n⁢ai⁢wi⁡(ξ,η) where x, y, and z are coordinates in a Cartesian coordinate system, z0 is a coordinate of the surface shape before deformation, wi is an i-th order natural mode, ai is a weight coefficient for the i-th order natural mode, and n is the maximum order of the i-th order natural mode and the i-th order natural mode is shown by non-dimensional coordinates (ξ,η); and visually displaying the surface shape of the pressing tool based on the results of the calculation on a display.