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 EquationStoughton’s empirical formulaand 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.