Patent Document ID: 7542889
Application ID: 10570648
Patent Flag: 1

Claim One:
1. A method for determining a model of a geometry of a forming stage ( 1 ) in a computer-aided design (CAD)-system, comprising the following steps: defining a first geometry object, which comprises a geometry model of the forming stage ( 1 ) in a first condition; defining an operator for describing a relation between the first geometry object and a second geometry object, which describes the forming stage in a second condition, wherein the operator comprises parameters for describing at least one forming step of the forming stage ( 1 ); computing the second geometry object from the first geometry object by way of carrying out an operator method, which by way of the geometry of the forming stage ( 1 ) in the first condition, by way of the parameters of the at least one forming step, and by way of a physical simulation of the at least one forming step, determines a geometry of the forming stage ( 1 ) in the second condition; and producing a computer model in the working memory region of the CAD-system computer corresponding to the forming stage in the second condition; wherein the operator method computes an edge line of a forming stage in an initial condition before a forming process, from the geometry of the edge line ( 3 ) in a result condition after the forming process, and the operator method comprises the following sequential steps: generating a computation mesh, for describing a geometry of the forming stage in the result condition; initialising condition parameters for at least one of a multitude of mesh elements and mesh nodes of the forming stage ( 1 ) in the result condition; mapping the computation mesh onto a geometry of the forming stage ( 1 ) in the initial condition; computing condition parameters changed according to the mapping, in the mapped mesh elements and/or mesh nodes; determining a balanced computation mesh for the initial condition by way of shifting mesh elements or mesh nodes, until element forces of the mesh and external forces are at least approximately in equilibrium; and extraction of the edge line ( 3 ) of the forming stage ( 1 ) in the initial condition from the balanced computation mesh.