Welcome to the
second part in this series of articles around Generative Design within the Manufacturing
sector. The next local step, after setting the scene in the previous article https://excitech.co.uk/Insights/Blog/April-2020/Generative-Design-for-Manufacturing-Article-1,
is to dive deeper into how you can look to introduce Generative Design into
your current workflows.
The only product
which currently includes Generative Design is Autodesk Fusion 360. However, do
not let that put you off if you are an existing Inventor user. Most people
these days will be utilising Inventor as part of the Product
Design and Manufacturing Collection, which also includes access to Fusion
360. However, I would recommend you speak to your license Contract Manager to
confirm this. But assuming you do have access to Fusion 360 as part of your
package, you can simply download/install, then start to explore.
The first thing you will need to do, when
approaching Generative Design. Is to consider your requirements, this can include
things like:
- Are there parts of the design which need to be kept, i.e. holes or clearance areas?
- Are there manufacturing constraints? What manufacturing processes do you have access to?
- Are there areas of the design where no material should appear or obscure?
- Where are the constraints on the design, i.e. fixings or bolts?
- Consider your objectives, is it light weighting or increased stiffness?
- What loads is the design subject to, including misuse?
- What materials are available?
The geometry we need to create for this
scenario, is perhaps not what you would expect. As you are effectively
modelling the constraints of the problem, not the outcome geometry, which is
more traditional. Therefore, for this example the modelled problem is going to
be something like the image below.
Where the Green items are Preserve regions
and the Red items are Obstacle regions. Put more simply, the Green areas are
parts of the end design we must have, i.e. holes for the bolts to the wall and
where the clevis will attach. The Red areas are regions where we do not want
any material, i.e. clearance for bolt heads and tools, or where we need the
outcome to have a flat bottom to attach to a wall.
Where Blue arrows are loads with direction
of force, Green arrows represent Gravity and its direction on the part. The
Padlock items are Fixed constraints applied to the component, in this example
illustrating the points where the bracket would be bolted to a wall.
Now you need to make choices around how you
want to manufacture the part, what materials you want to use and your study objectives.
At this point and prior to running a study
and using up Autodesk Cloud Credits in the process, it is well worth doing a
Preview. This will indicate where material will go and just as importantly
where material should not go.
Once all the above has been done and assuming the Preview is looking sensible, with no material starting to form where you do not want it etc., then you are ready to run a study. At this point, you will be advised of your Autodesk Cloud Credit usage, at the time of writing this is 25 Credits per study run (with multiple outcomes). All the information will be uploaded to the cloud and processed accordingly. The Study option allows you to see the progress of outcomes during the process and investigate the differing results to compare results.
The below are some different examples from
a single study, to highlight the differing manufacturing outcomes.
All study outcomes can be analysed and
compared, to review how well they perform, alongside results based on the original
objectives. These can be shown in different ways and the display of information
can be focused on what are the important criteria for you and the study being
conducted.
There could be different uses for this information, it can
give you an indication of where to add/remove material from an existing design
you have. It could be there to advise on a completely new design. Or you may
want to directly use the generated 3D data. This data can be downloaded, upon
completion of processing in the cloud in one of two formats: T-Spline or
Mesh. You will be advised of your Autodesk Cloud Credit usage to do this;
at the time of writing this is 100 Credits per download of a Generative Design
outcome.
Once downloaded, this data can be used
directly inside Fusion 360. Or the data can be exported from Fusion 360 or
Teams. Or if you currently utilise Autodesk Inventor, then you have access to
AnyCAD import, via the Autodesk Desktop Connector functionality.
Hopefully, this article provided a greater
understanding of the workflow required with Generative Design in Autodesk
Fusion 360; along with an introduction as to how you might include this
alongside your current workflows in Autodesk Inventor.
If this is something you are interested in
exploring further, then please get in touch by emailing us at info@symetri.co.uk