|
Ruled Shell Ring |
Scroll |
To build a ruled shell ring, use the Ruled Shell Ring 
command.
After you run the command, specify the ruled shell ring parameters, check the correctness of the specified values using a phantom and complete the operation.
Operation result
The result of this operation may be creation of a new solid or merging of the element with the existing solid. To select the desired option, use the Result group of buttons on the Parameter Panel:
Merging,
New Solid.
More details about selecting an operation result...
Bases of the Ruled Shell Ring
Set sketches of the first and second bases of the shell ring.
•If the model has the sketches, specify them in the Design Tree or in the graphic area.
•If there is no proper sketch, build one by clicking the Create Sketch button 
to the right of the Base 1 (Base 2) field. The sketch placement process will start, and then the system will switch to the Sketch mode for Creating geometry. Perform the steps necessary for building and exit the sketch mode. The created sketch will be automatically selected.
After you select sketches, a phantom of the ruled shell ring is displayed in the graphic area. The names of the selected sketches are displayed in the Base 1 and Base 2 fields.
You can change the sketch if necessary. To do this, click Base 1 (Base 2) field and select the required sketch. You can also edit the selected sketch by clicking the 
icon.
Parameters of the Ruled Shell Ring
Set the parameters of the ruled shell ring:
•Material thickness and material adding direction are set in the Thickness field using the Change Direction button 
to the right of this field.
•The radius for bends in the contour corners is set in the Radius field. Depending on the selected thickness direction, the radius can be internal or external. The minimum admissible value of the internal radius is 0.0002 mm.
If a bend in the contour corner has a ruled surface, the bend radius will be the radius of a cylindrical surface closest to the ruled surface of the bend.
Flat Pattern
You can configure determination of the bend flat pattern length for a shell ring in the Flat Pattern section.
Select a method for determining the flat pattern length in the Length Determination Method list and specify the parameter for the selected method.
Please note that the flat pattern length parameter is relevant for cylindrical and conical bends of a shell ring. Bends with a ruled surface, if available in the shell, can unbend, however the result of unbending is conditional and does not depend on the parameter that determines the flat pattern length. To determine the surface type of the bend face, you can use the Object Info command.
More details on setting determination of the flat pattern length...
Flanges
You can set parameters of flanges of a ruled shell ring in the Borders section.
Select a method for creating base flangesby clicking the required button in the Base Flanges group.
For a shell ring based on closed sketches, specify:
•a method for creating joint flangesby clicking the required button in the Joint Flanges group,
•a gap value in the Gap field,
•a method for setting the gap offsetby clicking the required button in the Move group, and the parameter for the selected method.
Segmentation
You can segment arcs of circles and ellipses in the base contours of the shell ring — replace them with polylines with segments of equal length. You can configure segmentation in the Segmentation section.
1.Set the Segmentation toggle switch to I (enabled). The controls to configure segmentation will appear on the Parameter Panel.
2.Select a segmentation method and specify a parameter for the selected method.
More details on setting segmentation options...
Splitting
The lateral surface of the ruled shell ring is split into faces automatically. If required, you can move, add or delete edges. You can configure splitting in the Splitting section.
1.Set the Auto Determination toggle switch to 0 (disabled). A numbered list of shell ring edges will appear on the Parameter Panel.
2.Set new positions for edges. This is done in the same way as changing the position of edges of the ruled surface.
More details on configuring splitting a surface into faces...
Properties of the Ruled Shell Ring
You can set the name of the shell ring and properties of its surface display using the controls located in the Properties section.
More details on managing the object color and optical properties...
Completing the operation
To complete building, click Create Object 
.
After completing the above steps, a ruled shell ring will appear in the model, and its icon will appear in the Design Tree.
Bends of the shell ring are also displayed in the Design Tree. If required, you can edit any bend.
|
You cannot create a ruled shell ring if the resulting solid has self-intersections. If the phantom is not present, the ruled shell ring cannot be built. |
To complete operation of the command, click Finish 
.
•You can set the thickness of the shell ring, bend radius, position and value of the gap in the graphic area using defining points.
•You can set linear and angular parameters using the commands of the geometrical calculator.
•You can change the default values of the shell ring parameters in the Sheet Solid Properties dialog.
•You can assign tolerances to the values of the operation parameters expressed in linear values. To do this, run the Tolerance command located in the menu of the required parameter, or click the 
icon displayed in the parameter field (the icon is displayed if a tolerance is assigned to the parameter value).
More details on assigning tolerance...
See Also
