NAGSIM_Gen.2D
Overview
NAGSIM_Gen.2D is a powerful, general- purpose nonlinear finite element
analysis (FEA) software program that quickly and accurately simulates
two dimensional engineering applications and hot, warm or cold metal
forming processes. It can simulate large plastic deformation of
the part as well as elastic deformation of the tools.
NAGSIM_Gen.2D is advanced and
general-purpose extension of NAGFORM.2D program for simulation of
cold forging processes, with additional capabilities of
- Temperature analysis during deformation.
- Deformation analysis of compressible
materials.
- Choice of element types for deforming
part.
Eliminate Trial &
Error in Forming
NAGSIM_Gen.2D allows you to model
the part forming in a computer before running it in the machine. NAGSIM_Gen.2D
provides accurate information to:
- Reduce die trials and costly mistakes.
- Improve tool life.
- Predict under fill, laps and cracks.
- Optimize preform shape.
- Predict temperature and density distribution.
- Determine mechanical properties of formed
part.
- Determine influence of lubricants.
- Shorten print-to-part time
- Improve part quality
It complements 'NAGFORM'
and 'NagForge', knowledge-based
programs to create alternative forming sequences to form parts by
cold, warm or hot forging processes.
A Complete and Easy-to-Use
Solution
NAGSIM_Gen.2D provides a complete and easy-to-use solution from creating
a model of the forming operation to post-processing of simulation
results. NAGSIM_Gen.2D's graphical user interface is tailored specially
for simulating metal forming operations. Templates for common forming
operations are provided to reduce the effort required to create the
analysis file. NAGSIM_Gen.2D has its own basic CAD module to create
geometry of the workpiece and the tools. The part geometry can also
be imported in DXF format from other CAD systems such as AutoCad,
SolidEdge, SolidWorks etc. Geometry can be stored in 'Part Library'
for reuse.
Efficient and Robust Solver
NAGSIM_Gen.2D uses an incremental finite element analysis solver,
based on thermo-visco plastic formulation, that is specially suited
to metal forming operations with large plastic deformation. Two types
of problems can be analyzed:
- Plane Strain deformation: Section of
long parts.
- Axisymmetric deformation of round parts.
Material Database
NAGSIM_Gen.2D has a database of materials commonly used in cold, warm
and hot forging. New materials can be easily created and stored in
database. The flow properties of the material are defined dependent
upon strain, strain rate and temperature. A subprogram is provided
to analyze compression test data for flow stress formulation.
Automatic Meshing and
Remeshing
NAGSIM_Gen.2D incorporates an automatic element mesher. After the
deformation process starts, the program automatically remeshes the
part when the old mesh gets excessively distorted or it is desired
to mesh certain areas with finer mesh. Different remeshing schemes
are available.
Elastic Analysis of Tools
Elastic stress analysis of tools is performed for the whole deformation
cycle, providing a complete picture of tool stresses during forming.
Cold, Warm Forging and
Hot forging
NAGSIM_Gen.2D can simulate cold forming as well as warm and hot forging
with different temperatures of the part and the tools. Its formulation
includes dependence of the flow stress of the material on temperature,
strain and strain rate. Speed characteristics of forging machines
such as presses can be included in the analysis. The movies below
show (a) how the temperature rises in a cylinder and the flat dies
during cold upsetting and (b) temperature distribution during hot
forging of a side gear.
Flash Movie:
Temperatures Distribution in Upsetting
of a Cylinder
Flash Movie:
Temp. Distribution in Hot Forging
of a Side Gear
Forging of Compressible
Materials
NAGSIM_Gen.2D can analyze material models of incompressible metal
plasticity at room and elevated temperartures, and compressible plasticity
at ambient temperatures. For compressible materials, changes in density
due to forming is simulated. Movies below show how the density changes
(a) when a cylinder made from porous material ( 0.80 density) is upset
between flat dies and (b) a porous part is forged in contoured dies.
Flash Movie:
Density Distribution in Upsetting of
a Cylinder
Flash Movie:
Density Distribution in Forging
Element Types for Deforming
Part
Linear QUAD element is used throughout NAGSIM_Gen.2D. For cold forging,
Triangular 'Mini' element based on U-P formulation can be selected
in place of QUAD element for the part.
Results and Information
NAGSIM_Gen.2D provides a complete insight into the forming process.
The results include: Material flow, stress distribution, strain distribution,
temperature distribution, density distribution, formation of laps,
load-displacement, tool stresses and contact between the part and
the tools. Animation of results presents a clear visual of the forming
operation. Tensile damage, Grain Flow and Tracing deformation path
of a point are included in the results.
Batch Processing of Multiple
Jobs
NAGSIM_Gen.2D can batch process simulation jobs one after the other.
Also automatic simulation of entire forming sequence ( multiple operations)
can be set up.
