Posts Tagged ‘3DVision Technologies’

ABS Snap Fit Non-Linear Static Study

Monday, June 22nd, 2015

I recently acquired a dehumidifying rod from a family member and it was missing the mounting components.  After looking everywhere in my family members basement we could not locate the missing items.  So what is some one who has access to SOLIDWORKS and a 3D Printer to do?  That’s right lets make our own.

A dehumidifying rod is an electric heater that facilitates natural convection in enclosed areas like safes, vehicles, small rooms etc.  The first place to start is thermal side of things and material selection.  The Uprint Plus uses an ABS like material for the printer with a melting temperature of 600 degrees F.  The rod runs at a constant 100 degrees F with a maximum of 125 degrees F.  The wide temperature factor of safety lead me to proceed with a 3D printed design.

The dehumidifying rod mounts had two requirements.  One that they could be screwed down to secure the rod, and that the rod can be easily removed for maintenance if needed.  This lead to a snap fit design.  The original design was stout and bulky and left me wondering if it was overkill.  This is where SOLIDWORKS Simulation is introduced into the design phase.  I wanted to verify that the rod could be removed and “snapped” back into place easily. Because the material is an ABS and the snap fit is a sliding contact this requires a Non-Linear analysis.


DriRod

The Simulation  setup was straight forward.  The rod will remain stationary and the the Clip will be moved a prescribed displacement until it “snaps” onto the rod.  To simplify the model and speed up the run time the analysis will be completed using symmetry.  A no penetration contact was specified on the contacting faces of the rod and the clip.  A mesh control was specified in these contact areas as well.

Steel was the material choice for the rod and an modified default ABS was used for the clip.  The ABS was copied to a custom material folder and changed to be a Plasticity- von Mises material model.  The true Stress-Strain curve of the ABS material was unknown so a representation of the curve known as a Bilinear stress-strain curve was used.  This curve uses the Tangent modulus roughly 1/10th of the Elastic modulus, as the second portion of the curve beyond yield.

Material Properties ABS

 

DRiRod2

 

The results from the first design did indeed show that it was too stout and required a large force to push the clip onto the rod.  The contact plot clearly shows a force requirement of 45 lbs. to spread the clip at the widest point.  This force value lead to a redesign of the clips upper arm.

Design 1 Stress

Contact 1

 

Design Two narrowed the upper arm and reduced the force required by 30 lbs.  The force however was still too high and required another design change.

Design 2 Stress

Contact 2

 

The Third and final design change reduced the arm thickness as well as changed the lower fillet size.  The changes reduced the force required to “snap” the rod in place to a reasonable 3.5 lbs.

Design 3 Stress

Contact 3

 

SOLIDWORKS Simulation Premium Non-Lienar analysis allowed me to design a mounting clip that holds the dehumidifying rod firm and in place without over design.  Quickly and easily I was able to walk through multiple design iterations and Simulations verifying a reasonable “snap” force.  I am happy to report the dehumidifying rod is in place and has been working for a couple of weeks without issue. Have you used a Non-Linear analysis before or have questions? Let me know in the comment section below!

Robert Warren

Elite Application Engineer CAE Technical Specialist 3DVision Technologies

Pack and Go Now Available for Flow Results

Wednesday, June 3rd, 2015

Pack and Go Now Available in SolidWorks Flow Simulation

Pack and Go has been a staple in SolidWorks functionality for years. It allows a SolidWorks user to package SolidWorks  files such as Assemblies, Parts, and Drawings into a new folder location, or a Zipped file.  Pack and Go can keep the current file structure of folders and sub folders, or flatten to one folder.  This allows a user to make back ups of their work, or transfer files to others easily.  You can rename the new saved files individually or globally with a suffix or prefix creating a new file set.  The user does not loose custom appearances decals or scenes saving time and work when copying the files.  Toolbox components can also be included in the Pack and Go.

SolidWorks Simulation files have always been able to be included with the Pack and Go, However New for 2015 SolidWorks Flow Simulation can now add results files (.fld) to a Pack and Go.  This added functionality allows a user to quickly roundup all the important files needed to transfer, or store their design.  Simply select the Pack and Go option from the file menu. Choose the “Include Simulation Results” check box, and proceed like normal.  Please note that with the Flow Results included the Pack and Go .zip file will be large in size.

Pack and Go

Pack and Go has always made it easy to accumulate all the important files to transfer or store.  Now in 2015 Flow results are added to this great functionality. Lets us know through the blog comments how this functionality has helped you in your daily engineering tasks.  Pack and Go will continue to improve and add functionality as it matures.  Users like you help shape how the product behaves and what new functionality is added.  keep up the good work.  It has been requested for a while and we finally have Flow Results included with Pack and Go.

 

Robert Warren

Elite Application Engineer CAE Technical Specialist 3DVision Technologies

3D ContentCentral: Get Those Models for Free

Thursday, May 28th, 2015

Most companies I work with use purchased components and want to add them into their assemblies.  So how do you get the solid models?  You might contact the company for the model or just model it yourself.  Well you could download the models for free without contacting anyone by using 3DContent Central.

3D ContentCentral Logo

3D ContentCentral (3DCC) is a free service for users to download solid models.  How is this different than other similar sites?  This is a Dassault Systemes site and the models are not just from users.  You have the ability to download models that other users have modeled but you also have the option to download from certified suppliers.

Suppliers can upload their models from their catalog to allow consumers to download them for free.  This way you can add it to your assemblies and have the BOM show the true items to be assembled.

3D ContentCentral BOM

There is also integration into your SOLIDWORKS interface.  If you open the Design Library, you will see it on the right side.  When you click on it, it will take you to the website allowing you to download the files.

3D ContentCentral  Integration

Many of the files allow you to configure them before you download.  So you can choose a different color, different size, etc.  You can also choose what format you want to download the file in.

3D ContentCentral Configure

How many suppliers are on 3D ContentCentral?  I just counted 840 which are from all over the world.  You can search for a specific supplier or find them in the global list.

So what if you want a model from a supplier but they aren’t on 3DCC?  You have the ability to request the content.  You can make the request to have a member of the 3D ContentCentral community model it.  Or you can request that a supplier be added to 3DCC.

3D ContentCentral Request

3D ContentCentral is going through a website redesign.  They are changing the interface, adding a new eDrawings viewer which will be available in many browsers/mobile, and an improved searching tool.  The viewer will allow you to rotate, section, and shade the models so you know what you are downloading.

3D ContentCentral preview

Check it out here: Beta 3D ContentCentral

3D ContentCentral Interface

I have used this site many times and have suggested users check it out.  There are over 1.3 million members who have used 3DCC.  Are you one of them?

Let me know in the comments below if you’ve used it and what you think.

Josh Spencer

Elite Application Engineer, CSWE 3DVision Technologies

Plastics Symmetry Analysis Saves Time

Monday, May 11th, 2015

SolidWorks Plastics has joined the other Solidworks Simulation Products (Simulation, and Flow)in offering a Symmetry Option.   What is Symmetry you ask?

According to Merriam- Webster Symmetry noun sym·me·try \?si-m?-tr?\ is: the quality of something that has two sides or halves that are the same or very close in size, shape, and position : the quality of having symmetrical parts.

With regards to analysis not only does the geometry need to be symmetric but the analysis boundary conditions need to be as well.

For SolidWorks Plastics Symmetry two rules need to apply.

  1. The model needs to be symmetric about a plane, two planes, or an axis.
  2. The injection location is also split by the symmetry condition.  This allows a user to take a fraction of a cavity and analyze it better, faster, and smarter.

Plastics Symmetry

 

 

Symmetry is accessed through the mesh settings with a solid mesh type.

Symmetry

 

Symmetry is an excellent option to save processing time.  The results are fast, efficient, and reliable getting the user answers like never before.

 

Robert Warren

Elite Application Engineer CAE Technical Specialist 3DVision Technologies

DimXpert Tips

Thursday, April 30th, 2015

With SOLIDWORKS MBD being released, you might be trying out DimXpert for the first time.  If you want to learn more about SOLIDWORKS MBD, check out my previous blog entry.  Here are some quick tips that might help.

Change Annotation Plane

When you have an annotation, you might need it to be placed on a different plane.  An example would be the dimension is on the TOP plane and you need it on the FRONT plane.  If you select the annotation, click the Single Quote button on your keyboard.  It’s the button with the ~ & `.

SingleQuote

This will bring up the annotation plane box allowing you to choose where to place it.

Annotation Plane

Combine Dimensions

If you have multiple DimXpert dimensions and they are the same, you can combine them.  Just select them and RMB; it will give you the option to Combine Dimension.

Combine Dimension

Dimension Names

In the DimXpert Manager, the dimensions are just listed out with a generic name (i.e. Diameter1, Diameter2, etc).  You have the ability to rename them to whatever you want.  This can help with finding specific dimensions later.

DimXpert

Basic Dimensions

When you have a Geometric Tolerance, you might want to display the basic dimensions (the ones with a box around them).  If you select the GT in the tree, RMB and choose to Recreate basic dim.

Basic Dimension

Imported Models

DimXpert isn’t only for SOLIDWORKS files.  You can import other 3D models and apply dimensions to it.  The dimensions do not look at features but rather geometry.

Josh Spencer

Elite Application Engineer, CSWE 3DVision Technologies

You Need to Use SOLIDWORKS Shortcuts

Friday, April 17th, 2015

Life is full of shortcuts but those typically don’t work out well for anyone.  Well that’s not the case with SOLIDWORKS shortcuts.  There are many places to use shortcuts in parts and sketches.

Think about how you create a model in SOLIDWORKS.  You choose a sketch plane, start a sketch, find a sketch entity to use, add some dimensions, then extrude that sketch into a feature. You do this over and over again until the model is created.  But during that process are you being as efficient as you can be?  Are you using any SOLIDWORKS shortcuts?  Well I hope you are.

When I’m teaching, I emphasis SOLIDWORKS shortcuts.  I say they really will help get your design done quicker but I never really had any data to put behind it.  So I figured that I would model the same part 2 different ways.  One way I would model using my typical shortcuts and the other would be with none.  I timed myself modeling both ways to see which one was faster.  I also downloaded 2 tools to help track my mouse movements.  One shows where my mouse has been with a black line and the other tracks the distance in feet that my mouse has traveled.

Here’s the model that I choose.  It’s a part that has 3 extruded bosses, 3 cuts, 3 fillets, 19 sketch entities and 19 dimensions.

Ratchet Screen

The first model I used my typical, everyday SOLIDWORKS shortcuts.  These are some hot-keys (i.e. “L” for line & “D” for dimension), mouse gestures, and the shortcut tool bar (“S” key).

It took me 226 seconds to model it and my mouse traveled 28 feet.  That isn’t too bad as a good base value.  Here is what the mouse path graphic looks like.

Ratchet Screen_Shortcuts

You can see that my mouse really stayed in the middle of my screen right where my model is.  I didn’t need to move to the command manager for anything.

Now let’s look at the one where I didn’t use any SOLIDWORKS shortcuts.  I knew that this one would be slower and I would have a lot more mouse movement.

It took me 421 seconds to model it and my mouse moved 103 feet.  Here is the mouse path graphic.

Ratchet Screen_Manual

I can say that I modeled this as fast as I think I can.  I had to really try to not use any shortcuts.  This was harder than I thought it would be.  As you can see, my mouse spent more time on the property manager and command manager than in the graphics area.

Let’s take a look at the numbers.  I can see that I had a savings of 46% in time and 73% in mouse movement by using SOLIDWORKS shortcuts.

Savings

I don’t know of a reason not to use SOLIDWORKS shortcuts.  I just proved out the reason for them with sketches and parts.  You need to customize your environment to match what you do.  So if you do a lot of sheet metal then add the sheet metal tools to the shortcuts or whatever features you use the most.

I thought you might be wondering what my “S” key has on it.  Here it is for sketches and parts.

SOLIDWORKS Shortcuts SketchSOLIDWORKS Shortcuts Parts

I also have shortcut keys that I use and mouse gestures.  Here are 2 PDFs that have my tools.

SOLIDWORKS Shortcut keys document

SOLIDWORKS mouse gestures document

Again, you need to customize yours to match what you do.

Josh Spencer

Elite Application Engineer, CSWE 3DVision Technologies

Material Models for Simulation Premium

Friday, March 20th, 2015

What Material Model should be used for a specific

Non-Linear Study?

A commonly asked question is what material model should be used for a specific Non-Linear Study?  The answer is divided into three parts.

1. What is the material in the design(Steel, Rubber, Plastic, etc.)?

2. What is happening to the material(remain elastic, plastically deform etc.)?

3. What material property data is available for the material?

Material Choice in Design

Lets discuss material choice first.  Typically metals are characterized as a linear material and act as such.  Linear materials are simplified to behave predictably under specific loading criteria.  For Linear materials the Elastic Modulus, Poisons Ratio, and Yield Strength are all assumed to be constants.  Rubber, Plastics and Composites are accepted as Non-Linear materials and immediately require more than fixed material values.  As a rule of thumb the fore mentioned grouping holds true as long as the loading conditions dictate as such.

What is Happening to the Material?

What happens to the material under load?  What happens to the material during loading is as much a factor as the original material choice when specifying a material model.  Metals typically operate with a portion of the stress strain curve known as the elastic region.  The elastic region is typically from zero stress/strain to the yield point.  The slope of this line is the Elastic Modulus. When a load is applied and then removed the geometry will return to a zero state of stress and strain.  However what happens when the model moves beyond yield.  The once Linear Material is now Non-Linear and requires a defined Stress Strain Curve.  The Stress Strain Curve dictates how the material behaves under load beyond yield. Plastics, Rubbers, and composites are already Non-Linear and require a Stress Strain curve for their definition as the linear region of their curves either does not exist or is very small.

Stress Strain

The information assumed about the material helps determine what material model can be utilized within simulation.  For some materials a simple stress strain curve is not enough and one or more of the simple tension, bi-axial tension and shear test curves is required.

 What material property data is available for the material?

SOLIDWORKS Simulation Premium contains several different material mathematical models to choose from, and covers a wide range of options to best suite the analysis being ran. Please consult the Simulation technical reference guide and help file for more information on the models and their uses.

Simulation Material Choices

A general list of materials models and its use is below.

Elastic Models: Geometry Returns To It’s Original Position After Loading

Linear Elastic Isotropic –        Linear Material with properties the same in all directions x,y,and z

Linear Elastic Orthotropic-   Linear Material with properties different in the x,y, and z directions

Non-Linear Elastic-                Non-Linear Material with elastic properties (require a stress/strain curve)

Elasto- Plastic Models: Geometry Can Plasticity Deform When Loaded and Unloaded

Plasticity von Mises-              Studies von Mises Stress values, Goes Beyond Yield

Plasticity Tresca-                    Uses Shear Criteria and more conservative than von Mises formalization

Plasticty Drucker Prager-      Approximates Granular soil

Hyper Elastic Elastomers: Large Capacity To Take Strain With Relatively Low Stress Require a combination of the three curves mentioned above.

Mooney-Rivlin(M-R)-            In-compressible Strain up to 150% derived from 3 curves

Ogden(OHE)-                          In-compressible Strain up to 500-600%

Blatz-Ko-                                   Compressible Poisson’s Ratio is assumed to be 0.25

Simulation Premium also offers a Nitinol Model and a Viscoelastic for specific applications.

The above is meant to be a general guide as to what material model to choose for specific applications.  Three main factors are involved when choosing a material model, the material itself, loading conditions/application, and the material properties.

Click Here to learn more about SOLIDWORKS Simulation Premium. 

Robert Warren

Elite Application Engineer CAE Technical Specialist 3DVision Technologies

SOLIDWORKS Model-Based Definition (MBD) Has Been Released

Monday, March 9th, 2015

With SOLIDWORKS 2015 SP2, MBD was released at the same time.  Well what is MBD?  It is an integrated drawingless manufacturing solution.  Instead of creating a typical 2D drawing, all of the needed information is placed on the 3D model.  This helps reduce errors, increases production efficiency, and support industry standards.

You might wonder how this increases production efficiency.  It will make your process more efficient because there is not a need for 2D drawing files.  All of the information is already on the 3D file so why not use it?  The point of a 2D drawing file was to communicate to manufacturing on what the final item should look like.  This has been the main delivery.  A majority of the time it took to create the 2D drawing is now saved.

2D-3D

So you might be thinking that I still need to have dimensions and add notes so that will take a bunch of time.  All the time I am saving from the 2D drawing is being placed on the 3D model.  That’s not the case and leads me into the reduction of errors.  SOLIDWORKS MBD uses a tool that has been in SOLIDWORKS since 2008; DimXpert.  DimXpert is extremely powerful in creating PMI.  It has the ability to automatically create the manufacturing dimensions with tolerance on the 3D model.

dimxpert

But the reduction of errors comes with the ability to check all the faces for a dimension and tolerance by changing the face color.

SOLIDWORKS MBD’s main job is to organize all of the PMI data.  It does this by creating custom views to represent specific dimensions.  With 2D drawings you have multiple views with specific dimensions.  You do the same process with MBD by creating custom 3D views.  The helps deliver the intended information to production with less confusion.

3dviews

How is the information delivered to production?  You have 2 options which are industry standards.  You can save the information to eDrawings or a 3D PDF.  The 3D PDF is fully customizable to match your requirements.

MBD 3DPDF

I feel MBD is a great way to save time, reduce errors, and communicate easier with manufacturing.  If you would like more information or would like to see a demo, please contact 3DVision @ 1-800-745-3136 or click here.

Josh Spencer

Elite Application Engineer, CSWE 3DVision Technologies

Available Tables in SOLIDWORKS Drawings

Friday, February 13th, 2015

I get asked about the different tables in SOLIDWORKS drawings.  I’ll go over some of these as a high level overview.  This will cover BOM, Hole Table, Revision Tables, Weldment Cut List Tables, General Table, Weld Table, Bend Table, and Punch Tables.

Closed Table Rendered in SOLIDWORKS Drawings
BOM

The Bill of Materials is a list of the components and the quantities of each needed to manufacture the end product.  This can be customized a lot to be able to show different properties, different fonts, etc.

Bill Of Materials in SOLIDWORKS Drawing

Bill Of Materials

Once you would get it looking like you want, you would want to save it out as a template so you can easily get back to same style.  If you Right Mouse Click on the table you will get the option to save it.  You can then specify it as a Template and place it with your other ones.  The next time you start a BOM, you will want to choose the one you just saved out and the columns and font will be the same.
Save as template in SOLIDWORKS Drawing
When you RMC, you will notice you can save the BOM as an excel file.  Now with it in excel, you can import it to an ERP/MRP system.

Hole Table

This is used to automatically generate hole information in a tabular format.  The table will show the location and hole size from a specified origin.

Hole Table in SOLIDWORKS Drawing

Hole Table

You also have the ability to customize it with a specific font and size.  You can also add tolerances for the locations and the hole sizes.

Revision Tables

This type of table is used to represent the latest revision of the drawing.  You can see the description of the change, the date it occurred, who did it, and the revision symbol in the drawing.

REVISION TABLE in SOLIDWORKS Drawing

REVISION TABLE

The revision table can also update the Revision Block in your title block.

Weldment Cut List Tables

A cut list is similar to a BOM.  This is used with the weldment function to represent the cut lengths for structural shapes.

CUT LIST in SOLIDWORKS Drawing

Weldment Cutlist

The cut list can again be customized like the BOM to show what is important for final manufacturing.  It has the same ability to be saved as a template and excel file.  This is only active when you have a part file that is a weldment.

General Table

This would be used when you need to type in data in the cells rather than having the software automatically generate the data.  You have the same ability as other tables.  You can split, merge, sort, save, etc this table just like the other types.

Weld Table

The weld table is a summary of weld specifications.  It will represent weld quantity, size, symbol, length, and other custom bead properties.

WELD TABLE SOLIDWORKS Drawing

Weld Table

The table will get the data from the drawing view.  If you add the weld beads to the model, it will automatically fill the table out.  If you are only placing the weld symbols on the drawing views, there is an option in the property manager to include drawing annotations.

Bend Table

BEND TABLE

Bend Table in SOLIDWORKS Drawing

Bend tables are used with Sheet Metal parts.  In place of having many callout for each bend, you can represent these in a table.  It will specify the bend direction, the angle that it needs to bend to, and the radius of the bend.

Punch Table

PUNCH TABLE

Punch Table in SOLIDWORKS Drawings

Punch tables are also used with Sheet Metal parts.  This is very similar to hole tables but in place of holes, it is used with form features.  The table will represent the location of the punch on the flat pattern, the punch ID, the quantity, and the angle between the X-axis and the tool.

Thank You

This was just a high level overview of SOLIDWORKS tables.  If you have any specific questions about them, don’t hesitate to contact us.

Josh Spencer

Elite Application Engineer, CSWE 3DVision Technologies

Monthly Best – January 2015

Tuesday, February 3rd, 2015

Did you miss a few of our articles in January? Catch up now with our Monthly Best – January 2015 recap.

1. Unilever Accerlerates Consumer Product Prototyping by 40% with 3D Printed Injection Molds

Unilever has cut lead times for prototype parts by 40% since introducing Stratasys’ PolyJet 3D printing technology into its manufacturing process.

Full Article

2. SOLIDWORKS Simulation 2015 – Self Contact

There were a number of new features added in SOLIDWORKS Simulation 2015 to help improve our analysis work.  One of those cool features is the ‘Self Contact’ option, available in Simulation Professional and Simulation Premium.  Full Article 

3. The Benefits of 3D Printing for Your Business

3D printing is at the front lines when it comes to the future of business technology. Watch the video

4. SolidWorks World 2015 : The Movie Trailer

YouTube Preview Image

5. #3DVTechTip – Center of Mass Tool

Use the Center of Mass tool to show the global center of mass of your parts and assemblies. Use Insert Model Items to display them in drawings.  The Center of Mass feature will stay at the top of the feature tree and indicates the global center of mass. Full Tip Here

Monthly Best Using the SolidWorks Center of Mass Tool

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