You can perform a draft check or draft analysis to ultimately determine whether a model is suitable for a mold operation.
• Draft Check
– Specify references:
♦ Pull Direction
– Specify options:
♦ One/Both directions
♦ Draft angle
• Draft Analysis
– Similar to Draft Check
– You need not be in Mold mode to perform the analysis.
Figure 3 – Running a Draft Analysis
Performing a Draft Check
You can perform draft checking on a design model by first switching to the Mold application, and then selecting Mold Analysis
from the Analysis group. You can use draft checking to determine whether the design model has the correct surfaces drafted and suitable draft angles to facilitate the mold-opening process as well as the removal of the molding component.
You must specify the following references to perform a draft check:
• Surface – This specifies the surfaces for which the draft analysis is to be run. You can filter by Part, Surface, Quilt, or All Surfaces using the
drop-down list and specify the proper reference.
• Pull Direction – This specifies the pull direction to be used for the draft analysis. Usually, the pull direction is the direction in which the mold opens.
You can filter the pull direction reference by Plane, Coordinate System, Curve, Edge, or Axis and specify the proper reference. You can also flip
the pull direction to the opposite side of the reference.
You must also specify the following options:
• One direction/Both directions – This enables you to specify whether the draft analysis is run on one or both sides of the direction reference.
• Draft angle – This enables you to specify the desired draft angle to check for.
Creo Parametric checks the angle between the planes that are normal to the surfaces of the design model and the pull direction. For a specified draft angle, if the draft check is based on one side, then surfaces with a higher draft angle appear in magenta in the pull direction. Surfaces between zero degrees of draft up to the specified draft angle appear in yellow, and surfaces with negative draft appear in blue.
For a specified draft angle, if the draft check is based on both sides, then surfaces with a higher draft angle still appear in magenta in the pull direction.
However, surfaces with positive and negative draft up to the specified draft angle appear in yellow, and surfaces with negative draft greater than the negative of the specified draft angle appear in blue.
Using the Draft Analysis Option
You can also use the Draft analysis option to determine whether a model is suitable for a mold or casting operation. Like the draft check, you must select surfaces, specify a direction reference, specify one or both sides, and specify a draft angle. The system then produces a color plot of the draft angles.
Based on the highlighting, you can identify areas that do not have sufficient draft angles. The following options are available for adjusting the plot:
• Sample – This enables you to specify how the plot resolution is calculated.
Options include Quality, Number, and Step.
• Quality – This adjusts the quality of the plot.
When you perform a Draft analysis, you can obtain the following results information:
• Color plot of draft angles on the model. There are three different styles of color plots:
– Rainbow – This displays a plot with numerous colors.
– Gradient – This provides a three color display in the graphics window.
Sufficient positive draft angles appear in red, sufficient negative draft angles appear in blue, and insufficient angles appear in white.
– Two-color Display – This provides a two-color display in the graphics window.
For Rainbow and Gradient plots, you can specify whether the color scale is Continuous or you can specify the desired quantity of colors that appear.