Overview

In this example demonstrates how to perform sheet metal design analysis on a 3D model using sheet metal dfm analyzer tool (DFMSheetMetal_Analyzer). For this purpose, used a console application that imports a model, traverses through unique ModelData_Part , creates and runs DFMSheetMetal_Analyzer, groups and prints information about found issues and their parameters into console. Sheet metal design analysis will be performed for each unique ModelData_Part , but only for the scope of accepted geometries.

Application needs 1 input argument to run:

Usage: sheet_metal_dfm_analyzer <input_file>, where:

<input_file> is a name of the file to be read

For more information about sheet metal design analysis visit Sheet Metal Design for Manufacturing (DFM) page.

Implementation

PartProcessor class is inherited from ShapeProcessor and overrides ProcessSolid and ProcessShell methods that are used to run DFMSheetMetal_Analyzer on given shapes. Then PrintIssues method is used to print information about found issues and their parameters in a console.
Visit Model Explore Helper Implementation page for more information about base ShapeProcessor class implementation.

class PartProcessor(shape_processor.ShapeProcessor):
    def __init__(self):
        super().__init__()
        self.myAnalyzer = mtk.DFMSheetMetal_Analyzer()
 
    def ProcessSolid(self, theSolid: mtk.Solid):
        anIssueList = self.myAnalyzer.Perform(theSolid)
        PrintIssues(anIssueList)
 
    def ProcessShell(self, theShell: mtk.Shell):
        anIssueList = self.myAnalyzer.Perform(theShell)
        PrintIssues(anIssueList)

To traverse only unique parts of the imported model, the ModelData_ModelElementUniqueVisitor class is used.

aPartProcessor = PartProcessor()
aVisitor = mtk.ModelData_ModelElementUniqueVisitor(aPartProcessor)
aModel.Accept(aVisitor)

After performing design analysis, the object of FeatureGroupManager class is used to group and sort found issues. For this purpose, there is a traverse through all found issues and add each of them to FeatureGroupManager with a specified name.

for anIssue in theIssueList:
    if mtk.DFMSheetMetal_SmallRadiusBendIssue.CompareType(anIssue):
        aManager.AddFeature("Small Radius Bend Issue(s)", "Bend(s)", True, anIssue)
    elif mtk.DFMSheetMetal_SmallDiameterHoleIssue.CompareType(anIssue):
        aManager.AddFeature("Small Diameter Hole Issue(s)", "Hole(s)", True, anIssue)
    elif ...

After adding all found issues to FeatureGroupManager, a Print method of the manager is used to print information about found issues and their parameters in a console. PrintFeatureParameters is created to explore and print issue parameters. It uses as an input parameter of Print method.

def PrintFeatureParameters(theIssue: mtk.MTKBase_Feature):
    if mtk.DFMSheetMetal_SmallRadiusBendIssue.CompareType(theIssue):
        aSRBIssue = mtk.DFMSheetMetal_SmallRadiusBendIssue.Cast(theIssue)
        feature_group.FeatureGroupManager.PrintFeatureParameter("expected min radius", aSRBIssue.ExpectedMinRadius(), "mm")
        feature_group.FeatureGroupManager.PrintFeatureParameter("actual radius",       aSRBIssue.ActualRadius(),      "mm")
    elif mtk.DFMSheetMetal_SmallDiameterHoleIssue.CompareType(theIssue):
        aSDHIssue = mtk.DFMSheetMetal_SmallDiameterHoleIssue.Cast(theIssue)
        feature_group.FeatureGroupManager.PrintFeatureParameter("expected min diameter", aSDHIssue.ExpectedMinDiameter(), "mm")
        feature_group.FeatureGroupManager.PrintFeatureParameter("actual diameter",       aSDHIssue.ActualDiameter(),      "mm")
    elif ...

Visit Feature Group Helper Implementation page for more information about FeatureGroupManager class implementation.

Example output

Below is the example output for model from ./examples/models/Power_box_Chasis.stp.

Model

Example output

Model: Power_box_Chasis

Part #0 ["power box sheetmetal"] - solid #0 has:
    Irregular Depth Extruded Hole Issue(s): 3
        3 Hole(s) with
          expected max extruded height: 1.5 mm
          expected min extruded height: 0.6 mm
          actual extruded height: 2.29072 mm
    Large Depth Bead Issue(s): 1
        1 Bead(s) with
          expected max depth: 0.36 mm
          actual depth: 5 mm
    ...

    Total issues: 17

Files

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Java: All files
Python: All files

Table of Contents

Overview

Implementation

Example output

Files