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.

 

  1. Select QUICK SETUP/GRAVITY LOADING.
  2. Select DRAW TYPE.
  3. 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.
  4. 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.
  5. Key in the blank thickness. The default blank thickness is set as 1.00 (mm).
  6. Select the solver option.
  7. Click APPLY to auto-position the tools and blank.
  8. Click SUBMIT JOB to submit the analysis.  Refer to Section 13.1 for more details.