Calculation methods govern simulation accuracy
A
StampingSimulation.com product story
Edited by the Engineeringtalk editorial team
Apr 24, 2007
It is important to understand the difference between the calculation methods used in sheet metal forming simulation.
The terms "Incremental" and "One Step" refer to calculation methods used to solve the forming simulation mathematics of a sheet metal forming simulation problem.
It is important to understand the difference between the two calculation methods and to understand when it is appropriate to use each method.
One Step is a single step calculation that completes very quickly (in one step).
The primary input is a CAD model of the final part geometry.
No tooling geometry is considered.
The result is a single picture of the final part shape, without all the "incremental" steps between a flat blank and a fully formed part.
Only a single process can be calculated using this method.
Just about all blank shape calculators use this method to calculate an initial blank.
No consideration is given to the process used to form the part but it is loosely equivalent to a single stage crash form.
The One Step method is appropriate only for approximate results when time is of the essence and results are need quickly.
This method is most appropriate when a part is to be formed in a single crash forming process, from a 100% developed blank.
Apart from this specific case, it is best considered an approximation only.
It is used extensively at the quotation stage of a new press tool project.
Incremental is a calculation method whereby every step of the forming process (from flat metal to final form shape) is considered and calculated in "incremental" time steps.
The primary input is complete surface models for every forming step in the process.
Using this method, a complete simulation of the forming process is generated very accurately, outputting forming limit and thinning information as basic results, for every "increment" of the forming process.
More than one process can be considered using this method, but it can also be used to simulate a single stage forming process more accurately than a One Step calculation.
It is most appropriate when multiple forming stages need to be simulated accurately.
Furthermore, very accurate blank developments can be achieved through multiple forming processes using incremental forming simulation.
It is used whenever a reliable accuracy is required.
StampingSimulation.com always uses the Incremental simulation method when performing full sheet forming simulations services.
The online quotation system automatically assumes the incremental method will be used.
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