Today I check some mold designs from some Young mold designers, I find a common and Easily neglected problem—they often forget to add drafts in some areas, maybe they don’t realize it’s importance, you know, the draft facilitates part removal from the mold. If no Drafts (or taper) in a mold, we will get Unqualified products, as for how to design, I want to share some experiences:
At first, in a direction parallel to the mold opening and closing, the draft is in the offset angle, and the amount of draft angle depends on the depth of the part in the mold.
Second, how to decide the draft, I think, the best design is to make the molding part easy release from the mold, the empirical value is to allow 1 to 2 degrees of draft, with an additional 1.5° min. per 0.025 mm (0.001 inch) depth of texture.
Of course, above empirical value is a common recommendation, for many precision molding parts, their drafts have many special requirements, if you are interested in it, we can discuss more about it.
Draft angles allow for removal of the plastic from the mold. Without draft angles, the part would offer significant resistance due to friction during removal. Draft angles should be present on the inside and the outside of the part.
The deeper the part, the larger the draft angle. A simple rule of thumb is to have a 1 degree draft angle per inch. Not having enough draft angle may result in scrapes along the sides of the part and/or large ejector pin marks.
Please don’t laugh, many mold designers will ignore some in mold design.
I agree plastic product design has it’s special requirement
This is a basic principle of mold design, but some mold designers sometimes neglect it
Hello, I check your blogs regularly.I think your blog will benefit a lot of peoples in mold industry
Your blog is great! I like to read!
your remind is very necessary
Thank you for your remind, this is a plastic product’s design rule
as a product designer, I want to say this is a basic requirement when designing a plastic part
Thanks for sharing your thoughts about mold design.
that is an important detail for every mold designer
that’s very important!
Your reminding is very important for many mold designers
Great Weibo！it is very useful and interesting!
This is a very important reminding
I do remember:-)
your suggestion is correct
sometimes I really forget to do so on some area on a new product design
as a mold designer, Thank you for reminding me
sometimes that kind of job will be completed by mold designer, if you have built a good business relationship between your product company and mold company
on this issue, maybe we can discuss, actually it depends on your product.
For those primary mold engineers, this is an easily neglected problem
Pretty! Thiѕ is an extremely useful post for many mold designers. Тhanks for sharing your experience
as a mold designer, I want to say your suggestion is very important.
please don’t worry, I never forget:-)
Fresh mold designers are easy to ignore the problem
your suggestion is very good! thanks!
yes! sometimes, I really forget it:-)
sometimes on some areas of a plastic part, it does not allow to add draft
thanks for sharing your experience
this is a topic we need to discuss carefully, Maybe we can learn more
thanks for sharing your experience
Sometimes due to the special requirement of products, some places are not allowed to add draft, though it would increase the cost of the mould
but some areas on some plastic part, draft angle are banned because of function
Hi for a plastic part design, this is a common rule,actually because of special function ,there is no draft on some places of Some products
As a product designer, it’s just a basic requirement
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