The draw bar menu provides functions to
generate draw bars on the die surface. There
are three types of draw bars available:
1.
Draw
bar ends with a spherical shape (Tear Drop Head). Figure 7.4.29 shows the
control parameters in the dialog box.
Figure 7.4.29 Parameters for Tear Drop Head
2.
Draw
bar ends with a conical shape (Tear Drop Tail). Figure 7.4.30 shows the
parameters in the dialog box.
Figure 7.4.30 Parameters for Tear Drop
3. Tear Drop (Draw bar without main body). Figure 7.4.31 shows the
parameters in the dialog box.
Figure 7.4.31 Parameters for Tear Drop
Control Parameters:
Rs: Draw
bar Radius
Rf: Fillet Radius
Wh:
Wall Height (can be zero)
Sw: Top Strip Width (can be zero)
A: Wall Angle (default of 6 degrees)
Rt:
Lt: Length of Tear Drop
The
steps to create a draw bar are listed as following:
·
Click
on the Draw Bar function from the
DFE Modification dialog box to display the Draw Bead dialog box as illustrated
in
Figure 7.4.32(a). If the user wishes to define the element size
of the draw bar, toggle off checkbox of the Auto Element Size option.
As illustrated in Figure 7.4.32(b), the user can
enter the element size in the input field.
·
Select
one type of draw bar. The default selection is Draw bar ends with a spherical
shape (Tear Drop Head).
·
Click
on the Parameters button to display
the corresponding dialog box as illustrated in Figure 7.4.29-Figure 7.4.31.
(a) With Auto Element Size (b) With User Defined Element
Size
Figure 7.4.32 Draw bar dialog
·
The Create
Draw Bar Surface option enables the user to generate draw bar surfaces. This option is selected as default. The user may disable the option if the draw bar
surfaces are not required.
·
Define
the centerline of the draw bar. The
centerline is the center of the draw bar’s main body, including both ends.
·
If centerline
is available in the current database, click on the Select Center Line button to
select the centerline. Else, click on the Construct Center Line button to create a line by selecting nodes
on the mesh.
·
After
the draw bar parameters and centerline are defined, click on the Apply button
to generate the draw bar. Select Yes to keep the draw bar mesh or No to reject
the mesh. The Reverse button is used to
reverse the draw bar on the opposite side of the tool. If the Create Draw Bar Surface option is
selected, the draw bar surface will be generated together with the mesh.
If the tear drop draw bar is selected, the dialog box as illustrated in Figure 7.4.33 is displayed. Click on the Select Two Nodes button to select two nodes to define the direction of the centerline. The head of the tear drop will be placed at the first selected node. The length of the tear drop is determined by the parameters defined in the Parameter window.
Figure 7.4.33 Tear Drop
Figure 7.4.34 shows the details of three types of draw bars.
Figure 7.4.34 Three Types of Draw bars