Process Tab (Manufacturing Plate Properties Dialog) - Intergraph Smart 3D - Help - Hexagon

Intergraph Smart 3D Structural Manufacturing

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13.1

Processes are rule-based and can be customized by each manufacturing facility.

When you select multiple objects, you can change the properties that those objects have in common. If the value of the property is the same for the objects that you have selected, that value displays in the ribbon bar. If the values are different, the box for that value is blank. Changing the value of a property makes that the value for all of the selected objects.

Results

Select a manufacturing plate process type from the list. This list is the same as the Process List on the manufacturing plate ribbon.

Parameter

Displays the parameters for the process that you have selected.

Value

Specifies modifiable parameter values.

Rule-Based

If the value of the parameter is rule-based, a check box displays. Clear the check box and then select a different parameter value if necessary.

Catalog Value

If you modified the value, the original catalog value for the process displays.

Parameters

Neutral Axis

Some facilities make the neutral axis position a function of thickness. This determines the position based on material, thickness, and bending direction where there is no change in length when unwrapping.

Upside

The side of the part that is facing up while it is being cut.

Unwrap Algorithm

Select the unwrap algorithm:

Developable

Useful for unwrapping knuckled plates and single curved shell plates. Bending lines are evaluated on the curved surface.

Unwrapping is done by unbending at the bending lines. The first two bending lines define the plane that the shell plate is unwrapped into. The unbending is then done by rotating a part of the shell plate around a bending line. By doing this rotation around all bending lines, the shell plate is unwrapped into a plane.

Flat

Useful for unwrapping flat plates. There is no unfolding done with this algorithm. The contour curves and markings are simply transformed into a plane.

TwoDirUnfold

Minimizes the change of curve length after unwrapping the curve to a plane. Because this approach is based on minimizing the change of curve length, it does not handle extremely curved surfaces (for example, bending angles larger than 120 degrees) which includes most closed surfaces. For a curved part with a great degree of curvature (such as near the nose), split the plate into several pieces before unwrapping it.

Geodesic_Merge

Depends on n-surface merge as it uses iso-u and iso-v meshed points to evaluate normal and derivatives to derive local geodesic. The algorithm then uses the meshed points to derive one-to-many corresponding u-v parameters for unwrapping curves on the surface. The quality of this method largely depends on the accuracy of the merged surfaces and the parameterization. This method can handle closed surfaces if n-surface can generate a good result.

This method uses an approach similar to finite element modeling, where the surface to unfold is approximated into a regular mesh of points and normals. The objectives are to preserve the geodesic length and minimize the deformation of the mesh. This method produces accurate results when unfolding developable surfaces such as cylinders, cones, or developable ruled surfaces.

SNU

Useful for unwrapping hull plates. All of the patches comprising the hull shape, along with the contour and marking data, is sent to a third-party unfolding algorithm developed by Seoul National University (SNU).

SNU_Single_Surface

Similar to SNU, except that the patches are merged into a single b-spline surface before the software sends it to the SNU algorithm.

SNU_FourSided_10

Adds material to all four sides to create a rectangle which provides a 10 mm margin around the original contours.

SNU_BOX_Margin Unfolding Example

1 - Margin dimension

2 - Newly calculated contour

SNU_FourSided_50

Adds material to all four sides to create a rectangle which provides a 50 mm margin around the original contours.

SNU_FourSided_100

Adds material to all four sides to create a rectangle which provides a 100 mm margin around the original contours.

SNU_Thermal

Indicates that the shop applied heat to shape the plate using steel contraction.

SNU_Cold

Indicates that the shop used pressure rolling to shape the plate using steel expansion.

SNU_Neutral

Indicates that the shop used hydraulic presses to shape the plate using linear bending. This method does not induce expansion or contraction.

SNU_Thermal - Rev

Similar to SNU_Thermal, except that the spine is reversed by calculating perpendicular to the auto-spine direction.

SNU_Cold - Rev

Similar to SNU_Cold, except that the spine is reversed by calculating perpendicular to the auto-spine direction.

  • The spine direction on a surface determines how that surface unfolds. The base position of the spine determines the its elongation size and direction.

PDBT STRMFG Process Tab (Manufacturing Plate Properties Dialog Box)_spine and branches

  • The spine direction depends on the shipyard fabrication practices. The facility determines whether to use an auto-spine or a reverse spine, and applies that direction to the algorithm. For example, if the spine is parallel to the longer side, the curvature of the surface is ignored, and the spine is positioned parallel to the longer side. However, this process might not be right for every shipyard.

PDBT STRMFG Process Tab (Manufacturing Plate Properties Dialog Box)_spine direction

SNU Custom

Allows you to specify the SNU algorithm and the unfolding parameters in catalog tables or in the configuration .xml file.

The following example shows how to specify the SNU algorithm:

SNU Custom MfgUnfoldProxy.MfgSNUOptions|Forming=0;SpineDir=2;BoxOffset=0

The SNU Prog IDs now support argument and value pairs separated by a semicolon.

The following example shows how to specify the Prog IDs:

SNU_PROGID|argument1=value1; argument2=value2; argument3=value3;argument4=value4

The SNU Custom parameter supports the three arguments described below. These arguments might be extended in the future based on users need.

  • Forming Options

    • 0 = Thermal forming

    • 1 = Cold bending

    • 2 = No deformation

  • Spine Direction

    • 0 = The software automatically computes the spine direction

    • 1 = Reverses the automatic spine direction

    • 2 = Aligns the spine along the longer direction

    • 3 = Aligns the spine along the shorter direction

  • SNU Box Offset

    • Value specified in mm

Bevel

The facilities need to handle the bevel information depending on their capabilities. They can have a continuous bevel, a bevel within increments, or a fixed bevel. The deviation angle determines when a segment of a physical connection should be created to provide new bevel information for that segment.

Roll Lines

Specifies the roll line calculation process.

User Defined Values

Shipyards can control certain values used during the unfold process of plate parts.

Weld Tab

Automatically specifies a weld tab based on the assigned custom rule. These can be partially solved by replacing the feature by an alternative representation defined for scallops.

Feature Tab

Automatically specifies a feature tab based on the process rule.

Knuckle Tab

Automatically specifies a knuckle tab based on the process rule.

Margin

Specifies margin values for the manufacturing object based on the process rule.

Shrinkage

Specifies shrinkage values for the manufacturing object based on the process rule.

Marking

Specifies marking lines for the manufacturing object based on the process rule.

Cut Mark Control

Controls the behavior of cut, mark, and ignore behavior for all features, openings, and hole traces.

Marking Validate

Controls the validation of marking lines. You can merge overlapping marking lines or connect disjointed markings.

Plate Custom

Stores custom manufacturing plate part attributes that will be exported to the final XML.

Feature

Shipyards control the way the plate features are processed during unwrap. Some openings must be unwrapped with the plate. The rest should be reapplied after the unwrap process is completed.

Some facilities are using this in their analysis software to determine if they are influencing the strength of a plate and therefore should or should not be included in the unwrap process.