Method for designing a tool for deep drawing and tool for deep drawing of sheet metal

A tool for deep drawing sheet metal to form a sheet metal component having a predefined component geometry, said tool comprising a die, a binder and a punch, whereby the binder is used to fix the sheet metal in an edge zone of the die, before the sheet metal is pressed in a drawing direction by the means of the punch into the die, said tool comprising at least one addendum zone surrounding the component, whereby said addendum zone complements the component geometry in the edge zone and runs into the component and the binder with a continuous tangent, said addendum zone is generated by a method comprising the following steps:

• a. arranging along the component edge at a distance from one another several sectional profiles directing away from the component edge;
• b. whereby the sectional profiles are parameterized by the means of profile parameters, the profile parameters being scalar values;
• c. laterally interconnecting the sectional profiles by a continuous surface to form the geometry of the addendum zone of the tool;
• d. creating surfaces for the smoothing of irregular zones of the edge of the component;
• e. generating of binder surfaces located outside of a punch zone and circumferenting the component geometry;
• f. determining initial direction of sectional profiles away from the component edge;
• g. defining of sectional profiles at characteristic points, which describe the principle course of the sectional profiles;
• h. interpolating of intermediate profiles using forming technology parameters for the creation of the addendum surface;
• i. creation of the addendum surfaces by interconnecting the characteristic profiles;
• j. interactively adapting the addendum surfaces by the characteristic lines by the characteristic points;
• k. creation of a punch opening line as intersection of the sectional profiles defining the addendum with the binder surface of the tool.