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This allows considerations for design requirements to be taken into account. This includes product designers, design engineers, and of course, the customer. Draft should be a part of design for manufacture, and all stakeholders and contributors should be aware of its need at the outset of the design process.Draft angles are generally a requirement of injection molding design (though there are a select few soft materials, like nylon, that can get away with draft angles of zero).Most, if not all, of these benefits offer either direct or indirect overall production cost reductionsĪ few more things to remember about draft angles for injection molding:.Reduces overall cooling time by lessening or eliminating the need for unconventional ejection setups.Ensures the integrity and uniformity of other surface finishes and textures.Ensures a uniform, smooth, unscratched finish when required.Reduces wear and tear and chances of damage to the mold.Reduces the chance of damage to the part due to friction during release.Not only does this create a much easier release process, it offers several other benefits, depending on the design of the part: By accounting for thermoplastic shrinkage during the cooling process, draft angles greatly reduce friction between the finished, cooled part and the side of the mold. Now that we’ve established what a draft angle is, let’s discuss what it does - and why it’s important.
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A draft angle is calculated as a degree measurement (or, less often, an inch or millimeter measurement) from the vertical axis of a mold, and it helps account for thermoplastic shrinkage, a practical reality of the injection molding process for most materials. We’ll cover a bit more about “why draft angles?” shortly - followed by some hands-on advice for calculating the correct angles for your parts - but first, let’s briefly recap the “what:” Essentially, draft angles for injection molding are a design consideration that makes it much easier for a part to release cleanly from a mold. (If it isn’t draft angles, it’s probably uniform wall thickness, detailed here previously. At the top of the list, you’ll almost always find the requirement for draft angles for your parts. When you’re talking about universal best practices for designing parts for injection molding, there are a few that are simply unavoidable.