TIPPING

 

In most stamping simulations, the global Z direction is used as the stamping direction.  Some part designs might not be compatible with DYNAFORM's default settings. The tipping function is used to orient the part in the stamping direction.  It allows the user to translate and/or rotate the part about any axis. The options in the tipping function are shown in Figure 6.1.27.

 

Figure 6.1.27 Tipping

 

The die must be defined before tipping.  The program will display a DYNAFORM QUESTION window, Figure 6.1.28, to prompt the user.

 

Figure 6.1.28  DYNAFORM Question Window

 

YES will assign the current part to the die; NO will exit the function. 

 

TIPPING CENTER

 

.         DEFAULT - The default center is the die's center of mass . 

.         USER DEFINE - The user selects a node, point or center coordinate as the tipping center,   Figure 6.1.29.

Figure 6.1.29 Tipping Center Selection Window

 

TIPPING WITH GEOMETRY (TOGGLE)

    

If this option is toggled ON, DYNAFORM will tip all the parts defined as DIE. All geometry in DIE including surfaces, lines and mesh will be rotated and translated.

 

TIPPING WITH ALL PARTS (TOGGLE)

If this option is toggled ON, DYNAFORM will tip all the parts in the project. All geometry in the project including surfaces, lines and mesh will be rotated and translated.

 

TIPPING CHECK

 

After tipping the die, it is recommended to use the UNDERCUT and DRAW DEPTH functions to check the tipping result.

.         DRAW DEPTH (toggle)
A contour plot shows the draw depth relative to the binder on the die.  Different draw depths are displayed in graduated colors on the die.  Draw depth is estimated with reference to the first point of contact.  When the die/punch is closed, the first point on the blank in contact with the punch is locked.  The rest of the part will be stretched from this point.

.         UNDERCUT (toggle)

A contour plot will show any regions in the die where undercut occurs. Red indicates severe under cut where the backdraft is less than zero degrees. Blue indicates a marginal area with an approximately 1~3 degree draft angle.  Green indicates a safe region where the draw angle is greater than 3 degrees. The user can set the threshold for marginal and severe backdraft.

Figure 6.1.30 Tip Check Options

 

AUTO-TIPPING

 

This function automatically converts the die to stamping position by averaging all normal direction vectors of elements to minimize the undercut and draw depth. In addition to the automatic tipping function, the user can tip the part around the U, V, and W axes to a more useful draw direction.  See Figure 6.1.29a.

  

Before Tipping                              After Tipping

Figure 6.1.29a Tipping Check

 

Note:     eta/DYNAFORM will automatically calculate the tipping center. There is a default local coordinate system at the tip center. The UVW direction is consistent with XYZ of the global coordinate system. The W axis is always the drawing direction. The functions on the tipping page rotate the part so that the W axis is the drawing direction.

 

MANUAL TIPPING

 

Auto-tipping may not be satisfactory due to an unbalanced mesh pattern or part shape.  A manual tipping function is provided for the user to further tip the DIE. The DIE can be rotated or translated on the U-, V-, or W-axis.  Using the U+/-, V+/-, W+/- buttons performs the tipping operation according to the increment defined in the dialog window. The tipping check will be visible if the UNDER CUT or DRAW DEPTH button is toggled ON. 

.         ROTATE

    Select ROTATE and enter a value for the rotation angle in the data window.  Click on the U+(-), V+(-), and W+(-) buttons that represent the rotation axis and the model will be rotated by that angle about the selected axis.

.         TRANSLATION

    If TRANSLATION is selected, the U+(-), V+(-), W+(-) buttons represent translation direction.  The value in the TRANSLATION DATA window is the incremental displacement along the selected axis.

UNDO AND RESET TIPPING OPERATION

 

 

 

DEFINED TIPPING

 

This function in the tipping menu is used to record and restore the tipping operation. ADD is used to record the tipping result. REMOVE is used to remove one record.  LOAD is used to restore the tipping result to the selected record.

Figure 6.1.29b Outer Smooth Options