DRAWBAR

 

The drawbar menu provides functions to generate drawbars in the die.  There are three types of drawbars available:

 

1.        DRAW BAR ENDS WITH A SPHERICAL SHAPE (TEAR DROP HEAD).  Figure 6.4.8 shows the control parameters in the dialog window.

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Figure 6.4.8 Parameters for Tear Drop Head

                           

2.         DRAW BAR ENDS WITH A CONICAL SHAPE (TEAR DROP TAIL). Figure 6.4.9 shows the parameters in the dialog window.

 

Figure 6.4.9 Parameters for Tear Drop Tail

 

3.        TEAR DROP (DRAW BAR WITHOUT MAIN BODY).  Figure 6.4.10 shows the parameters in the dialog window.

 

Figure 6.4.10 Parameters for Tear Drop

 

                  

Control Parameters:

                            Rs:   Drawbar 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:    Tail Circle Radius

                            Lt:    Length of Tear Drop

 

Create a drawbar using the following steps:

 

.         Click the DRAWBAR function, Figure 6.4, and the program will display a dialog window as shown in Figure 6.4.11aIf the user wishes to define the element size of the drawbar, un-check the AUTO ELEMENT SIZE option.  The dialog window will be changed to Figure 6.4.11b to allow the user to enter the desirable element size.

 

              

     Figure 6.4.11a Drawbar with Auto Element Size  Figure 6.4.11b Drawbar With User Defined Element Size

 

.         Select one type of drawbar. DRAW BAR ENDS WITH A SPHERICAL SHAPE (TEAR DROP HEAD) is used as the default selection.

 

.         Click the PARAMETERS button, and the program will display the corresponding dialog window as shown in Figure 6.4.8, Figure 6.4.9, or Figure 6.4.10.

.         Select the element size for the drawbar, either by AUTO ELEMENT SIZE or by user-defined element size.   The default option is AUTO ELEMENT SIZE where the element size of the draw bar is calculated based on the connecting mesh of the tool.  The user may define any other value suitable for the specific requirements.

 

.         The CREATE DRAWBAR SURFACE option will generate the surfaces when the drawbar mesh is created.  This option is selected as default.  The user may disable the option if the drawbar surface is not required.

 

.         Define the centerline of the drawbar.  The centerline is the center of the drawbar's main body, including both ends.

 

.         If there is a centerline in the current database, click the SELECT CENTER LINE button to select the centerline, or click the CONSTRUCT CENTER LINE button to create a line by selecting nodes on the mesh.

 

.         After the drawbar parameters and centerline are defined, click the APPLY button to generate the drawbar.  The program will activate the mesh acceptance buttons and prompt the user to accept the drawbar mesh.  Click YES to keep the drawbar mesh and NO to reject the mesh.  The REVERSE button is used to put the drawbar on the opposite side of the tool.   If the CREATE DRAWBAR SURFACE option is selected, the drawbar surface will be generated with the mesh.


If the draw bar type is tear drop, the program will display a dialog window as shown in Figure 6.4.12.  Click 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 6.4.12 Tear Drop

 

Figure 6.4.13 shows the details of three types of drawbars.

 

Figure 6.4.13 Three Types of Draw bars