Hi All,
I have a part model that is going to be injection moulded and I'm going to design the tool with Inventor Professional. I know the material that it will be moulded in and can be found in the Invemtor materials list from a search:-
I was hoping that when I looked at the shrinkage percent from the details it would be shown. Here's what I get:-
Do I have to enter this infoamtion myself? Or am I doing something wrong?
Thanks for any help given.
Regards,
Rob K
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If you select the material and then click Calculate Shrinkage - what happens. I think shrinkage is dependent on geometry and the material properties.
The CADWhisperer YouTube Channel
I didn't have Inventor in front of me - going from memory. I will check and get back later when I have access to Inventor.
The CADWhisperer YouTube Channel
Hello Rob,
The shrinkage data of selected material is empty because these shrinkage data is not tested by Autodesk moldflow material lab.
As you may know the material library in inventor is from the Moldflow material library.
If you want to shrinkage data, you can do the following methods:
Best Regards,
Gene
One thing to be aware of - and to be very cautious about - is that plastic manufacturers do NOT like to provide hard and fast shrinkage numbers for their raw materials, because then you might actually try and hold them to those numbers! If you look at a few data sheets for different plastics, you'll see a tremendously wide range of shrinkage numbers shown - I've seen some that show a range of .01% - 3%. This means that, for a 1 foot long part, you might see shrinkage of anywhere between .012" at the low side all the way up to almost 3/8" at the high side.
The reason for this is liability. The shrinkage depends on a tremendous number of factors about the part design and the processing techniques in place in your manufacturing setup, and one single number they give would almost certainly be wildly inaccurate for your individual circumstances. As a result, manufacturers are reluctant to give much information about shrinkage.
Rusty