Drawbead: Options and Results 

Access: Open this function from one of the following locations:

  • Select Die Design > Geometry Manipulation > Drawbead from the menu bar.

  • Select Geometry Manipulation > Drawbead from the following Die Design Guide: Die Process Design Guide (Forming).

Create drawbeads to control material flow into the die cavity, forcing stretching and limiting cracking and wrinkling in the stamped part.

Required Step 1

  1. Click to pickClick to pick(left mouse button) the curve (open or closed) that will be the trajectory/centerline for the Drawbead.

  2. Select the Allowable Radius screen parameter to define the allowable radius value. (See the Parameters table below for a complete list of parameters available for this function and their definitions.)

  3. ExitExit (middle mouse button) to proceed to Required Step 2.

Required Step 2

  1. PickPick (left mouse button) a smooth binder object. 

    If you do not select a smooth body for the binder object the following message appears, you can continue without selecting a smooth body. Click OK to continue.

  2. Go to the Project Centerline to Binder parameter. You can toggle this parameter to either project the centerline to the binder or not project the centerline to the binder. (See the Parameters table below for a complete list of parameters available for this function and their definitions.)

  3. If the Project Centerline to Binder option is selected, a direction arrow is displayed. Use the arrow to control the projection direction if needed. If you select Don't Project Centerline to Binder, no further action is required. Proceed to Required Step 3.

Required Step 3 

Use this step to define the Drawbead dimensions. You can also make the Drawbead ends taper down.

Defining the Drawbead dimensions

  1. Click the Required Step 3 icon  in the Drawbead Feature Guide.

  2. The Drawbead Parameters dialog is automatically displayed.

  3. Select a Section Type (Full Round or Rounded Rectangle) and enter the Dimensions values as needed. (See Show Dialog in the Parameters table below for more information on the Drawbead Parameters dialog.)

  4. Next, toggle the Complete Result / Partial Result screen parameter to the appropriate option.

Selecting ends to taper down

Material can overstretch or tear at the Drawbead's ends; therefore, it is recommended that each end be tapered down.

  1. Pick one or both end points of an open curve.

Note: The flip arrow that is displayed is for visual reference and cannot be adjusted.

  1. The Tapered End Off screen parameter appears. Click on it to display the H Drop and Distance parameters.

  2. Enter values for H Drop and Distance. (See the Parameters table below for a complete list of parameters available for this function and their definitions.)

  3. Click OKOK or ApplyApply in the Feature Guide to complete the function.

If Cimatron encounters an issue with any values defined in Required Step 3, the following error message appears.
Click OK and return to Required Step 3 to modify values as needed.



When the function has been successfully executed, the Drawbead feature will appear in the Feature Tree.

Parameters

Allowable Radius

The allowable radius of the centerline.

The default value is 5mm or .250 inches.

Complete Result /
Partial Result

Complete Result

This option will attempt to create the complete geometry.

If there is a geometry creation error, the Conflict Solver dialog will appear with the problem areas highlighted in red and a recommendation that the Partial Result option be used. Click Edit to return to the graphics display area and select the Partial Result option.

Partial Result

This options works backward through the geometry creation steps until it successfully creates the geometry.

Distance

Defines the length of the transition distance along the curve until the H dimension is back to the general height value. This value must be a positive number.

The default value is 40.0mm or 1.50 inches.

H Drop

The distance to decrease the section height at the very end of the Drawbead curve. The value entered must be a positive number and not exceed the H dimension value.

The default value is 1.0mm or .040 inches.

Project Centerline to Binder /
Don't Project Centerline to Binder

Toggle option that allows you to project the curve to the binder surfaces or not.

Project Centerline to Binder

Cimatron projects the chosen curve to the binder surfaces by default.

A direction arrow is displayed to flip the projection direction. The default direction is UCS Z+.

If the projection fails, the following message is displayed. Select OK to proceed.

Don't Project Centerline to Binder

This option provides a way to vary the height in some sections of the Drawbead. No projection takes place and no direction arrow is shown. The section will still follow the centerline; however, the height may not be correct in respect to the binder at all places. The Drawbead (as defined in Required Step 3) will follow the curve as it is and will merge with the binder where it intersects.

Show Dialog

Click this parameter to show the Drawbead Parameters dialog. To close the dialog, either click the Show Dialog screen parameter or click the X icon in the top right corner of the dialog.

The following images show the dialog as it appears for each Section Type selected (Full Round or Rounded Rectangle).

The Drawbead Parameters dialog with the Full Round section type selected.

The Drawbead Parameters dialog with the Rounded Rectangle section type selected.

Dimensions

Enter values for the Drawbead dimensions. Negative number values are not allowed.

A = Bead wall angle
The parameter has a checkbox to enable it.
The default setting is OFF (unselected).

Full Round default value: 0.00
Rounded Rectangle default value: 0.00

D = Bead diameter
This parameter is only available when the Full Round section type is selected.

Full Round default value: 10.0 mm or .375 inches
Rounded Rectangle default value: N/A

H = Bead height
Full Round default value: 10.0 mm or .375 inches
Rounded Rectangle default value: 10.0 mm or .375 inches

R = Root radius
This dimension has a radial button that allows the selection of either an outside or inside dimension but not both. If a material thickness value is found in Setup, Cimatron defaults to the outside round (R outer). If no value is found for the material thickness, Cimatron defaults to the inside round (R inner). You can select either manually; however, the outer round cannot be selected unless a value is entered for Material Thickness.

Full Round default value: 
R inner = 3 mm or .125 inches
R outer = 2 mm or .080 inches

Rounded Rectangle default value: 4 mm or .150 inches
R inner = 3 mm or .125 inches
R outer = 2 mm or .080 inches

Note: The corner radius value cannot be more than half of the Drawbead width. If you enter a corner radius that does not conform to this rule, the following message appears. Click OK and modify the corner radius value.


W = Bead width
This parameter is only available when the Rounded Rectangle section type is selected.

Full Round default value: N/A
Rounded Rectangle default value: 10.0mm or .375 inches

Section Type

Two Drawbead selection types are available:

Full Round

Rounded Rectangle

Some functionality may be dependent on the product package. Contact your Reseller if you require a license.