The Line
Bead interface after draw bead definition is illustrated in Figure 10.3.19.
Figure 10.3.19 Line bead dialog box
The user
can define the draw bead property, draw bead force and force coefficient, and
lock tool to the specified part.
1.
CURRENT
Show the
name and ID number of the current selected draw bead.
2.
REFERENCE
This option
enables the user to define or modify a draw bead property and show if the draw bead
has a corresponding reference line.
a) PROPERTY
The PROPID=1 button behind Property indicates the property of the current draw bead. The user may click this button to modify the draw bead property, as illustrated in Figure 10.3.20.
Figure 10.3.20 Draw bead Property dialog box |
Figure 10.3.21 Property parameters dialog box |
All the
existing properties are listed in this list.
·
NEW
This function enables the user to create a property.
Click this button to display the Draw Bead Property dialog box illustrated in Figure 10.3.21.
PROPERTY NAME
Set the property name. The default name is Property.
STATIC FRICTION COEF.
Set the static friction coefficient between
blank and draw bead. The default is 0.1.
DYNAMIC FRICTION COEF.
Set the dynamic friction coefficient between
blank and draw bead. The default is 0, which means the dynamic friction
coefficient between blank and draw bead can be neglected.
BENDING CURVE SCALE
Set the bending curve scale of the bending
curve. The default is 1.0.
DRAW BEAD DEPTH
Define the depth of the draw bead. The
default is 1.0.
·
MODIFY
This function enables the user to edit the
current property. Click this button to display the dialog box illustrated in Figure 10.3.21 for the user to modify the
parameters.
·
DELETE
This function enables the user to delete the
selected property.
Note: The current property can only be deleted
when it is not assigned to any draw bead. Otherwise, the program will prompt:
THIS ITEM CANNOT BE DELETED BECAUSE IT IS REFERRED BY DRAW BEAD.
b)
REFER TO
This function is used to show if
the current draw bead has a referenced line. It will display the ID number if
there is a referenced line; it will display <None> if there is not any
referenced line. If there is reference relation between a draw bead and a line,
when modifying the shape and position of line, the draw bead will change
accordingly. Click this button to delete this reference relation. The program
will pop up a confirmation dialog box illustrated in Figure 10.3.22. Click Yes to delete and No to not
delete.
Figure 10.3.22
Confirmation dialog box
Note: During the line operation, the ID number of a line cannot be changed. Otherwise, the reference relation will be deleted automatically. The changing and extending operations of a line will not change the ID number. Operations such as edit and modify will change the line ID number.
3.
LOCK TOOL
The function enables the user to specify a draw bead and lock it to a part along the stamping direction or working direction of the part, as illustrated in Figure 10.3.23.
Figure 10.3.23
Lock tool dialog box
The user may select a draw bead first and click the Select button to display the Select Part dialog box illustrated in Figure 10.3.30. The user selects a target part to which the draw bead will be locked.
Figure 10.3.24 Select Part dialog box
Figure 10.3.25 Lock tool dialog box
REMOVE: Remove the lock property of draw bead, which means the draw bead is not locked to any part. Click this button to display the dialog box illustrated in Figure 10.3.26 to query whether to remove locked part.
Figure 10.3.26 Warning dialog box
Figure 10.3.27 Before locking draw bead
Figure 10.3.28 After locking draw bead
Note: If draw beads are generated via AutoSetup, they are projected onto the target part along the Working Direction.
4.
LOCK FORCE DEFINITION
This
function is used to define the draw bead force. As shown in the interface in Figure 10.3.29, the user can select multiple
draw beads to define simultaneously.
Figure 10.3.29
Lock force dialog box
a)
TYPE
This option is used to select the method
for defining the draw bead force. The program provides four types: Constant Force, Bead Shape, Load Curve and Empirical Shape.
b)
FORCE
This option is used to define the
full lock force. The default is an empirical value calculated according to the
blank thickness and material. The user may change this value. By clicking the
Default button, the program will calculate the default full lock force according
to blank information.
c)
PERCENTAGE (%)
This option is used to define the
force coefficient of the draw bead. Input a percentage in the input field. The
current draw bead force is obtained via scaling the full lock force by this
percentage.
The detailed description of the four
types is as follows:
·
CONSTANT FORCE: Define the full lock draw bead
force. The user may obtain the full lock draw bead force value calculated by empirical
formula, or the user may input the force
value in the force input field. Click the Default button, and the force value calculated
by empirical formula will be recovered.
·
BEAD SHAPE: Calculate the full lock force
according to the draw bead profile shape. The interface illustrated in Figure 10.3.30 appears once this type is
selected. Click the Define Shape button to display the Draw Bead Force and Geometry
dialog box illustrated in Figure 10.3.31.
Figure 10.3.30 Calculate force dialog box
Figure 10.3.31
Draw Bead Force and Geometry dialog box
GEOMETRY
The program provides two draw bead profile shapes: rectangular draw
bead and semicircular draw bead. The user may adjust the draw bead profile
shape by input of control parameters, or by dragging the mouse cursor in the graphic
area. The control parameters of a rectangular draw bead are illustrated in Figure 10.3.32.
Figure 10.3.32
Rectangle draw bead profile dialog box
R1: Exit radius of draw bead.
R2: Entrance radius of draw bead.
R3: Exit radius of draw bead groove.
R4: Entrance radius of draw bead
groove.
H1: Draw bead height.
W1: Draw bead width.
CL: Clearance of draw bead groove.
TH: Blank thickness. This value is
obtained from the blank parameter and is not allowed to change.
W2: Width of draw bead groove. W2=W1+2TH+2CL
H2: Height of draw bead groove.
The arrow
in the above figure indicates the flowing direction of material.
The
control parameters of hemicycle draw bead is illustrated in Figure 10.3.33.
Figure 10.3.33
Hemicycle draw bead profile dialog box
R1, R2: Draw bead radius. The user can edit by dragging mouse cursor
but is not allowed to input directly for edit. The user can control it
precisely via W1.
R3: Exit radius of draw bead groove.
R4: Entrance radius of draw bead
groove.
H1: Draw bead height.
W1: Draw bead width.
CL: Clearance of draw bead groove.
TH: Blank thickness. This value is
obtained from the blank parameter and is not allowed to change.
W2: Width of draw bead groove. W2=W1+2TH+2CL
H2: Height of draw bead groove.
Note: The user can translate and scale the displayed profile shape by using the middle and right mouse buttons. Double click the middle mouse button in the display area to show the control points of profile shape. Double click the left mouse button to show the maximum extents of the shape profile in display area.
FORCE
Two methods
are provided here to calculate the force: Theoretical Equation(Stoughton’s empirical
formula)and DYNA (Force Calibrator). The former is
the default method to calculate the draw bead force and the latter is used to accurately calculate its force by adopting the
draw bead model.
Theoretical Equation: The Restraining force value and
Uplift force value of the draw bead can be obtained by theoretical equation.
The relative curves between the
restraining force value and the geometric parameter will be illustrated in the dialog box.
Uplift Force: The uplift force value generated
from the current profile shape is displayed.
Variable: The parameters to control draw bead force. If this parameters is changed, the draw bead force will change accordingly. For draw beads with different profiles, the control parameters are always R1, R2, R3, R4, H1, W1 and CL.
The relationship between the force
value or force factor and the variable is shown in the right side of graphic
display area. The user can change the variable (the current variable is H1) by
moving the dotted line in graph using the left mouse cursor. The corresponding
force will change accordingly. This control parameter will also change
accordingly in the geometry area.
DYNA: As
is illustrated in the figure below, when the user selects the DYNA option, and
clicks the Calculate button, the program will calibrate by finite element simulating method according to the geometric parameter to get the
draw bead restraining curve, uplift force curve, plastic strain curve and
dimension relation curve.
Figure 10.3.34 Draw Bead Force dialog box
Figure 10.3.35
DYNA dialog box
PROCESS PARAMETER
This function is used to define the friction between
blank and draw bead. The draw bead force will change accordingly if this value
changes. As illustrated in Figure 10.3.36, the blank material information is
displayed, and may not be changed.
IMPORT
The user is allowed to import the geometric parameter and calculation results of the
draw bead calibration
model.
EXPORT
The user is allowed to export the geometric parameter and calculation results of the draw bead calibration
model only when
calculation results are
achieved.
Figure 10.3.36
Process Parameter dialog box
After definition is complete, the Force input field will show the draw bead
force corresponding to the current profile and the Percentage value of 100%, as
illustrated in Figure 10.3.37. These two values are not allowed
to be changed manually.
Figure 10.3.37 Lock Force dialog box
·
LOAD CURVE: Define the draw bead force by
defining a force curve. As illustrated in Figure 10.3.38, the user may click the Define button
to display the dialog box illustrated in Figure 10.3.39. The user may define force curve values.
Figure 10.3.38
Define force curve
Figure 10.3.39 Define curve dialog box
·
Empirical Shape: The draw bead force obtained from an empirical shape is also calculated according to the empirical formula. The difference
is that the draw bead force will correspond to different shapes of the geometry
bead in terms of different materials and lock force percentage. These
parameters of shape are used to create the geometry bead.