Make a plastic phone cover using CNC milling
I made an instuction video on how to make this, and in this thread i want to reply on questions that you guys might have!
Why not design the injection point on the inside of the phone cover? – by @jegor-m
This is cause the inside has an insert to mold around, and in general you want to prevent injecting through inserts.
Where does the air go
Yes on big injection machines this is a problem, but here the tolerances are not so thight, one scratch and you will have plenty of ventilation…
What material did you use?
The mold is made out of Aluminum
How much did the mold cost?
We paid €400 for the mold, €50 for shipping
I used Solidworks mainly because i know the program very well and the iPhone can have difficult radii. you can easily use fusion360, thinkercat or any other (free) program, but im still learning those 😉
i had the same problem at the mould!! i put the one part back to the cnc and i milled that perimetrical line !after that used the mould just with the screws! i thought that was my mistake when i exported the cam thats why i didn’t mention it!
It’s not necessary to remake half of the mould, it’s possible to just remove the lip, drill holes for dowel pins to correctly align the two halves, and enlarge the clamping holes so they line up.
I’ve already suggested this fix to Manuel and he knows somebody who can do this for him.
It all worked very good i milled the lip away and know it fits with bigger holes for the screws.
So we tried to inject PP in the mold but also with me (84 kg) hanging on the lever arm it only injects as much as you can see on the picture.
What would you suggest me to do ? I think the temperature looks pretty good while injecting its at 260 deg. 🙂
And my second question is about the stamps you have created 🙂 We`d like to make our own stamps with an other logo 🙂 where did you let them produce? It would be great if you could tell me a bit about making those stamps 🙂
One suggestion would be to may be increase the mould temperature, to have plastic to cool slightly slower.
Another thing: how do you know the temperature of plastic? Could you may be share a photo / sketch of the orientation of the heating elements + the thermocouple location. It could be that your reading is taken from the heating element and that doesn’t represent actual plastic temp.
@jerzeek Hey Jerry 🙂 everything works great with the mold. We want to accelerate our process and therefore we d like to Know what that you used for clamping the mold halfs from the fish mold. It looks like 50 Times faster than using screws for mounting the mold halfs together 🙂 i hope you know what i mean 🙂
I’m not sure if this is what you’re after but have a look at this topic: https://davehakkens.nl/community/forums/topic/injection-mold-quick-release/
Thanks for all your answers 🙂 yes thats what im looking for
@manuelmaeder, glad to hear that it’s working! just like the the others i would suggest warming the mold, more pressure, hotter plastic, bigger sprue.
On the part of the clamping, indeed these clamps make the process much faster! But make sure you buy decent ones. The cheap one’s bend easily. also @kunststoffschmiede made moulds with quick releases : here
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