Design for Manufacturing Course 5: Injection Molding - DragonInnovation.com
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Lecture five in the Design for Manufacturing Course focuses on one of Scott’s favorite topics: Injection Molding. It’s really the core of the mechanical system for the hardware products built today. This lecture will cover a brief overview of injection molding, how the actual process works, and then spend time on part design. There’s really a unique series of design constraints that you want to follow in terms of best practice to make the best use of this process.
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Download the SlideShare presentation: www.slideshare....
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About Dragon Innovation:
Dragon Innovation (acquired by Avnet in 2017) provides solutions for the fastest, simplest, and safest way for companies to manage manufacturing complex products at scale. Founded in 2009 by the leadership team at iRobot who launched and scaled the first 4MM Roomba®s, Dragon Innovation has deep experience with high-volume electro-mechanical products. Our customer portfolio, encompassing both early stage and established companies, includes Ring, Dropcam, Shopify, SharkNinja, American Kennel Club, Sphero, Makerbot, reMarkable, Theragun, Coravin, and many more of the top name brands in innovative technology.
Dragon’s team-located in Cambridge, MA, Seattle, WA, Shanghai, China, Shenzhen, China, Hong Kong, HK, and Amsterdam, The Netherlands-focuses on the path from Prototype to Production with unmatched human expertise that simplifies and de-risks the New Product Introduction (NPI) process. Over the last decade, Dragon Innovation has been a manufacturing partner to hundreds of companies producing millions of quality products on time and on budget.
Connect with Dragon Innovation
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Thank you for making this. As an engineer at the beginning of his career, this is a great resource.
Awesome video, any beginner considering making injection molded parts should watch and take notes. Before you start, just go ahead and open the slides in another window for reference.
Watched this from the standpoint of a press operator, recognized most of the terminology though and it was interesting
Great Lecture! Thank you for posting this video.
Great lecturer, very well explained
Great video, many thanks!
Great series. Thank you
Are you able to release the powerpoint? I found this really helpful although can't get much from the videos/slides
Hi Adam,
We have the accompanying slide presentations on our blog - here's the link to the Injection Molding slides: blog.dragoninnovation.com/2014/07/25/dfm-course-5-injection-molding/
Thanks!
very informative!
Do any tools pull a vacuum instead of having air vents? Excellent video by the way.
We typically rely on the air vents for injection molding. For a silicone molds, we'd use a vacuum.
really useful solutions and experiences in this field,how many years have you been as a designer?sir
+Mike Lewis Hey Mike, Scott's career spans 20+ years.
Dragon Innovation great,are there some affiliate mold manufacturing factories for your projects?
Good information but you camera guy ... and the window glare on the screen, we can't see over half of what you show ... just would like to have seen the examples. Thanks for the info tho. Do you offer mold design services? Thanks
Hey Clint -- Thanks for the feedback and yes, we definitely would love to improve the quality of these (on the long list of things to do!). If helpful, we have the accompanying slides here: blog.dragoninnovation.com/2014/07/25/dfm-course-5-injection-molding/
And then we don't offer mold design services, rather we support our customers to select qualified factories with the capabilities to support their injection molding requirements. Feel free to hit our website (dragoninnovation.com) to learn more.
thanks for this, helps a lot
The presentation is not clearly displayed. But the lecture is very good
Pls. check the attached details for the link of presentation slides...
If you know the shrinkage value for a material say .004cm/cm for ABS. How do you decide on a particular dimention for example 2mm wall thickness?
The mold maker will take the cad files, which should be designed at the desired nominal dimensions of the part, and then will account for the material shrinkage in designing the actual cavity of the mold.
on a case where most of the sections are 2-3 mm wall thickness, but theres one huge section which has upto 8 mm, will it work on production mold on a very huge injection moulding machine?
any other processes which can be used instead?
Albert Sebastian The ideal wall thickness is a uniform 2mm. In some cases, you can go as thick as 4mm, but it's difficult to go beyond this thickness due to longer cooling times and sink marks. Not having been able to look at the part in question, my recommendation is to find a way to core it out to achieve something closer to 2mm.
You can use gas-assisted injection molding.
+Albert Sebastian Hello Albert- Yes, Gas Assist will help but the part design and process is unique which requires an injection molder to have the nitrogen gas systems on hand. The alternative to a very heavy wall is to use a foaming agent to allow the part to pack within the wall. You enter into the process of structural foam molding. Ultimately, you and your molder, ill need to determine which long term process is the best for your application. Good Luck!
Why 2 mm?
+allyourcode The 2mm is a good design rule of thumb. In terms of a range, typically you'd want to design your walls with a uniform thickness between 1 - 4mm. As the wall thickness gets thinner, it's more difficult to pack the mold (you can get around this by selecting a resin with a high melt flow index, such as nylon, which can go down to 0.5mm). For thick walls, it takes longer for the resin to cool, which increases the cycle time (and cost of the part), as well as resulting in more shrink marks.
Ahh. I see. Thank you!
Can we use your video link to post on our page facebook.com/shortframes.india
+Short Frames Yes, thank you for asking!
thanks