Part Thickness Analysis Using DFMExpress

DFM stands for Design For Manufacturability.

 

There are two ways to check the minimum and maximum wall thicknesses, one is using the thickness analysis tool which is built into solidworks professional tool and the other is using DFMXpress.

 

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We will use this model as an Example to understand this tool in SolidWorks 2013.

 

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To execute DFMXpress tool, you can go to the tool menu and click on DFMXpress or you can simply click on the shortcuts provided on top of the graphics area in SolidWorks.

 

After executing this tool, you will see this menu pallet, first thing to do while analyzing using DFMXpress is changing the setting of this tool according to the model.

 

Image-3Click on settings

 

DFMXpress validates the design for manufacturing it, this tool is used where problem might occur during the fabrication process, e.g. sheetmetal, edges etc.

 

To understand the working of this tool, we will check for wall thickness which do not come in between of the given range.

 

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There are different options for operation which requires analysis before fabrication like mill/drilling, turning with drilling, sheet metal and injection molding.

 

The reason for this analysis is the limitation of fabrication over CAD modelling.

 

In modelling, a designer can create any part with complex structures but DFMXpress lets the user enter their dimensional limit and it analysis and concludes the features or errors in features which does not go with the given specified values.

 

Let us understand the working of injection modelling.

 

In this the tool requires minimum wall thickness as well as maximum wall e thickness.

 

When these values are entered, SolidWorks checks entire model for wall thickness.

 

When wall thickness is greater than the maximum wall thickness then it gives an error and expresses the same in ‘not following rules’ menu.

 

Same error is reported when the current wall thickness anywhere in the part is less than minimum wall thickness.

 

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After entering minimum and maximum wall thickness, click ok.

 

Then DFMXpress will start analyzing the model for fault in thickness.

 

This takes some time and then results are presented on the same area where parameters were given as an input to the tool.

 

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This is a sample result, in this result 2 instances have failed.

 

To know where the failure occurred, click on the plus sign beside instance.

 

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For maximum wall thickness there are 4 instances, i.e. there are four places in our model where wall thickness is greater than the entered maximum wall thickness.

 

To see these instances, click on the instance and we can see the failure in graphics area itself.

 

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Arrow direct towards points which are at the end points of the wall which does not follow the rules specified by the designer.

 

After these are seen we can change the thickness by editing the part to make it easier for fabrication.

 

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This indicates that the indicated wall has thickness which is lower than the minimum specified thickness, and thus, is an error.

 

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In our example were 4 instances where wall thickness was greater than the maximum specified wall thickness, and 1 instance when the wall thickness was lower than the specified minimum wall thickness.

 

Contact us for more information and help on how to determine the minimum and maximum wall thickness of any part using DFMExpress, Design For Manufacturability at support@nccs.com.au or call 03 86770871