Springback compensation in the production of formed sheet-metal parts
A technology for forming parts and forming tools, applied in the field of springback compensation in the manufacture of formed sheet metal parts, to achieve the effects of fast calculation, saving calculation and rapid resources
Pending Publication Date: 2019-05-03
INIGENCE GMBH
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Problems solved by technology
For example, in tool construction, a significant proportion of the total cost is currently spent compensating for geometric deviations caused by springback
Method used
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Embodiment Construction
[0060] A number of exemplary embodiments are explained below to illustrate the possibilities of practical implementation of the invention. The proposed method is used for computer-aided, simulation-based determination of the effective surface or effective surface geometry of a real forming tool used to manufacture complex formed components by performing a drawing-type forming process on a workpiece . For this purpose, the geometry of the effective surface of the virtual forming tool is calculated by means of simulation. The virtual active surface or its geometry is then used as an indication or specification for manufacturing the active surface of the actual forming tool.
[0061] After the forming operation is completed, the desired workpiece form or shape can be dictated by the target geometry. The proposed method aims at geometrically compensating the springback of the real workpiece while taking into account the stiffness of the component, i.e. the stiffness of the workp...
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A method for determining an active surface of a forming tool for producing a complex formed part with a target geometry by performing a drawing type of forming process on a workpiece comprises a simulation of a forming operation on the workpiece by means of a zero tool for creating a first configuration of the workpiece, a simulation of an elastic springback of the workpiece from the first configuration into a second configuration that is largely free of external forces, and also a calculation of a deviation vector field with deviation vectors between the first configuration and the second configuration. In the method, a non-linear structural-mechanical finite element simulation is carried out on the workpiece. By the non-linear structural-mechanical finite element simulation, the workpiece is deformed from the first configuration or the second configuration into a target configuration by using deviation vectors of the deviation vector field. The following steps are thereby carried out: defining at least three fixing points of the first or the second configuration, wherein the fixing points are intended to remain unchanged with respect to their position during the non-linear structural-mechanical finite element simulation; fixing the first configuration or the second configuration at the fixing points; approximating the configuration of the workpiece to the target configurationoutside the fixing points by means of calculation of forces or displacements while taking into account the stiffness of the workpiece until the target configuration is achieved; and specifying the achieved target configuration as the active surface for the forming tool. A method for producing a forming tool, a complex formed part and a corresponding computer program product are likewise described.
Description
technical field [0001] The invention relates to a method for determining the effective surface of a forming tool for producing complex formed parts with a target geometry by performing a drawing-type forming process on a workpiece according to the preamble of claim 1 , and a method for manufacturing a forming tool, and a method for manufacturing complex shaped parts, and also to a computer program product. Background technique [0002] Formed parts from sheet metal, in particular parts of vehicle bodies, are usually produced by means of drawing techniques, for example by deep drawing or body stamping. To do this, a semi-finished product (called a slab) is placed into a multi-part forming tool. The shaped part is formed by means of a press in which the forming tool is clamped. The finished formed part is usually made from a flat blank through multiple forming stages, such as drawing, orthoforging, conditioning, etc., combined with finishing steps. [0003] Tool manufacturi...
Claims
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Patent Timeline
Login to View More IPC IPC(8): G06F17/50B21D37/20B21D22/26
CPCB21D22/26B21D37/20G06F2113/22G06F2113/24G06F30/23G06F30/17G06F2111/04G06F2111/08
Inventor S.哈格A.比尔克特M.施特劳布B.哈特曼
Owner INIGENCE GMBH