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How to choose the surface finish

2019-09-21 13:17:30

When designing a part for injection molding,it is important to keep in mind the relationships between surface finish, moldability, cost and lead time.

If the part will not be visible to the end user,you will probably choose to specify either PM-F0 or PM-F1 using the drop-down menus on your ProtoQuote (see sample).  But many times your design will require a more cosmetic surface finish. In these cases there are two key things to keep in mind:

Polishing: Smoother part surfaces are achieved using manual mold polishing techniques. Consider a part with tall,thin and curved rabs .in this case you should consider a significant cost increase bcs it is very time consuming to polish deep,narrow slots in the mold .And such lenthy polishing times may also affect the lead time for the parts, potentially making it impossible for protomold to accept your order for our 5-day turn.

Texturing: giving the line-of-sight nature of bead blasting,it may not be possible to texture the sides of minemally drafted ribs on a part bcs the mold surfaces may be addition, if the wall of the parts are textured it may have an adverse effect on the ability of the part to release from the mold,potentially resulting in unsightly “drag marks”.For these reasons we recommend that texture be specified only on areas of the part that are drafted at least 2-3 degrees.And in fact if your part have not sufficient draft you proto quote maynot even offer these textures as options for you to select.

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