GRAVITY LOADING
The QUIK
SETUP/GRAVITY LOADING GUI leads the user through the setup procedure for
gravity loading simulation. A typical GRAVITY LOADING GUI consists of DRAW
TYPE, TOOL DEFINITION (BLANK, BINDER and/or LOWER TOOL), BLANK PARAMETERS,
SOLVE OPTION and CONTROL as shown in Figure 8.1.2.

Figure 8.1.2 A Typical
Gravity Loading GUI for Single Action Draw Operation
DRAW TYPE
Enable the user to select one of the four
standard draw operations provided in QS GUI.
TOOL DEFINITION GUI
Define the tool and blank for a gravity
loading simulation.
BLANK PARAMETERS
Define blank material and properties.
SOLVE OPTIONS
The user may select either the EXPLICIT or IMPLICIT method
for a gravity loading simulation. The EXPLICIT method requires a longer
simulation time than the IMPLICIT method, but it provides good
reliability. Although the IMPLICIT method yields an accurate solution, it
is difficult to achieve converged non-linear equilibrium iterations when using
this method. Therefore, the EXPLICIT method is recommended for a gravity
loading simulation.
CONTROL
Define the initial velocity of blank.
8.1.1.1 TOOL DEFINITION GUI
The tool
definition GUI allows the user to assign the tooling and blank mesh required
for setting up a particular stamping simulation. For a SINGLE ACTION GRAVITY
LOADING simulation (as shown in Figure 8.1.2),
the tool definition GUI consists of BLANK, BINDER and LOWER TOOL.
By clicking on either the BLANK, BINDER
or LOWER TOOL button, the dialog boxes as shown in Figure 8.1.3
will prompt the user to select the method of defining blank or tooling.

(a)
(b)
Figure 8.1.3: The Tool
Definition dialog box (a) Define Blank (b) Define Tool
If the blank mesh
is available in a saved NASTRAN or DYNA file, the user can click the IMPORT
MESH function to read in the blank mesh. The QS interface will automatically
assign the part (blank mesh) as BLANK. Alternatively, the user can read in the
blank geometry (in CAD format) by selecting IMPORT CAD DATA function. The BLANK
MESH function (as shown in Figure 8.1.3a) is then used to mesh the blank
geometry. This function is similar to BLANK GENERATOR described in Section 9.5.
After completing the mesh generation, the QS interface will automatically
assign the part (blank mesh) as BLANK.
The TOOL MESH
function (as shown in Figure 8.1.3b) meshes
the tooling geometry. For detailed information about this function, refer to
Section 5.3.4. The QS interface will also automatically assign the tool mesh as
either BINDER or LOWER TOOL after the tool geometry is meshed.
The SELECT PART function
(Figure 8.1.3a)
allows the user to select the proper parts from the SELECT PART dialog box
(Figure 8.1.4) and assign them as BLANK, LOWER TOOL and BINDER in the QS GUI.
By clicking on SELECT PART function, the DEFINE BLANK dialog box is displayed,
and the user can continue by adding the corresponding parts as BLANK, LOWER
TOOL and BINDER. The SELECT PART function in the DEFINE TOOL dialog box (Figure
8.1.3b) is displayed. The DEFINE TOOL dialog box as shown in
Figure 8.1.5.

Figure 8.1.4 A
Schematic Illustration Showing the SELECT PART Operation for Blank Definition
in QS

Figure 8.1.5 A
Schematic Illustration Showing the SELECT PART Operation to Define the Lower
Tool in QS
8.1.1.2 BLANK PARAMETERS
The user may define
the blank material by selecting the NONE button as shown in Figure 8.1.2.
The program will display the MATERIAL dialog box as shown in Figure 8.1.6. For
detailed information about defining the blank material, refer to Section 9.9.
The NONE button is disabled if no blank is defined in the tool GUI.

Figure 8.1.6 The
Material dialog box
8.1.1.3 Quick Setup/Gravity Loading Procedure
Follow the procedures
listed below to set up the SINGLE ACTION gravity loading simulation.
- Select QUICK
SETUP/GRAVITY LOADING.
- Select DRAW TYPE.
- Click on the
BLANK/BINDER/LOWER TOOL button from the QS GUI to define/assign
blank/binder/die mesh. If the process doesn’t involve punch support, the
user can ignore the lower tool definition.
- Define the blank
material. If a blank material is not defined, NONE will be shown on the
button. Click the NONE button to select a blank material from the material
library or create a user defined material.
- Key in the blank
thickness. The default blank thickness is set as 1.00 (mm).
- Select the solver
option.
- Click
APPLY to
auto-position the tools and blank.
- Click SUBMIT JOB to
submit the analysis. Refer to Section 13.1
for more details.