Wenn Sie eine Oberflächenbehandlung für Ihr Teil in Betracht ziehen, müssen Sie unter anderem berücksichtigen, welches Material Sie verwenden, welche Endverwendung Ihre Bauteil hat und, ob sich Ihr Bauteil im Produktions- oder Prototypenstadium befindet. In diesem Video werden diese Faktoren im Detail betrachtet, um Ihnen bei der Wahl Ihrer Oberflächenbeschaffenheit zu helfen.
Text im Video
00:02[Music]
00:09hello and welcome to the master class
00:11this series of videos is all about
00:13giving you some practical advice to help
00:16you design better parts for digital
00:18manufacturing whether that part is
00:21produced by 3d printing injection
00:23molding or CNC machining we want to help
00:26you get it right this week we're going
00:28to take a closer look at the surface
00:30finish of a molded part and what you
00:33should be thinking about in theory there
00:36are a number of different surface
00:37finishings possible for anything from
00:40texture to a highly cosmetic smooth
00:42finish and of course putting that theory
00:45into practice is very different so there
00:49are a few things that you need to
00:51consider first what development or
00:54production stage is your part at is it
00:56prototype or is it a finished part
00:58second what material (Hersteller) is it being
01:01manufactured from and third what is the
01:04end use of the application we are going
01:07to deal with the number twos in this
01:09list and deal with some of the
01:11practicalities that you should be aware
01:13of before you begin your design let's
01:16start with plastics as these are the
01:18most common injection molded material
01:20there are of course hundreds of
01:23thermoplastic resins that are flexible
01:25strong and can give you fine cosmetic
01:28finish the finish will depend on the
01:31mold aluminium molds are processed using
01:33three axis milling and are easily hand
01:36polished or textured to any one of seven
01:38different finishings from anything from
01:40non cosmetic or textured surface to a
01:43high-gloss polish if that were it though
01:46this would be a very short video but
01:48life is never that simple there are of
01:51course more that needs to be considered
01:52than that the material that you select
01:55for your part can affect your surface
01:57finish generally the link is small but
01:59glass mineral or soft and high strength
02:01materials can produce parts with a
02:03different finish to what you are looking
02:05for these materials have unique
02:07properties that unfilled materials don't
02:10if you do an either cosmetic finish
02:13part you try to avoid them or at least
02:15be cautious about using them they can
02:17produce streaking making it difficult to
02:20distinguish between different finishings
02:22this isn't the case with all field
02:25resins but the best thing to do is to
02:27speak to injected molding supplier and
02:29get their advice a textured finish is
02:32different again in terms of what you
02:34need to know in this case your part may
02:37have more draft requirements than the
02:38polished surface would we deal with the
02:41topic of draft in a later video but
02:43briefly it means that you need to apply
02:45a slightly different taper to the face
02:47of the part so that it can be ejected
02:49from the mold if you don't then you may
02:52end up with scratches or drag marks the
02:55exact draft you need depends on both the
02:58design of the part itself and what
03:00surface finish you want a good example
03:02of a draft is taken look at an ice cube
03:05next time you're pouring that cider it's
03:07not a perfect cube it has rounded edges
03:10so that you can get it out of its mold
03:13but dragging you away from that cider
03:15it's almost worth noting that you may
03:18not be possible to get finishes or deep
03:21and thin ribs as they are very
03:23challenging to reach within the molds
03:25and if surface finishing is important to
03:28you then you must also think about
03:30gating this is where the liquid resin
03:32enters the mold
03:34unfortunately the gate interrupts the
03:36mold surface and that leaves an
03:38unavoidable cosmetic defect on your part
03:41ejector pins if needed to remove the
03:43part can also affect the finish these
03:46are all things that you need to think
03:47about at the design stage and just to
03:51add to the list you may find that your
03:53supplier can offer you custom finishes
03:56you might for example be able to order
03:58these different finishes apply to
04:00different sides of the mold plastics are
04:03the most common material used in
04:05injection molding but let's finish off
04:07by considering another popular option
04:09liquid rubber silicone the mold itself
04:12is produced and exactly the same way as
04:14plastic but the molding process is
04:16different it uses two liquids mix
04:19together which are then heat cured in
04:22the mold to produce the final part the
04:25big difference is that
04:26arts made from liquid silicone rubber
04:28are much more forgiving than plastic
04:30parts they can be manually moved from
04:33the mold so there's no ejector pins are
04:36needed liquid silicone rubber also needs
04:39extremely shallow gates so any
04:42imperfections from this area are almost
04:44invisible well that's it for this week
04:46we've hope you found of interest and we
04:49will see you next time
04:50[Music]
3d-druck oberflächenbehandlung oberflächenveredelung spritzguss
Letzte Änderung: 17.04.2020