Protolabs Insights: Oberflächenveredelung im Werkzeug- und Formenbau

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.

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 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]