Plastic Moulding Expendable Cores 1

[drawoh]

I know this is done in sand and in investment casting of metals. Is there a way to do this with injection moulded plastic?

Cheaply of course![ ]

--
JHG

 

[MintJulep]

Theoretically, or actually?

 

[drawoh]

MintJulep,

After forty some odd years of designing stuff and sending out drawings, I find myself sitting at the opposite desk. I am reviewing drawings for feasibility and cost, and the design is very interesting let's say.

--
JHG

 

[Pud]

Yes there is. Using low melting point alloys (e.g. similar to Wood's metal)
The cores are usually melted out in hot oil and recast for reuse.



Politicians like to panic, they need activity. It is their substitute for achievement.

 

[Pud]

Oh. It's not cheap. High capital cost.


Politicians like to panic, they need activity. It is their substitute for achievement.

 

[3DDave]

There are also water-soluable plastics, often used as support material for 3D printing. PVA is the typical culprit.

 

[Pud]

Wikipedia:

https://en.m.wikipedia.org/wiki/Fusible_core_injection_molding

Politicians like to panic, they need activity. It is their substitute for achievement.

 

[Jboggs]

Not a casting man here but - could this be like lost foam casting?

 

[drawoh]

3DDave,

I have seen the water soluable plastics used for 3D[ ]printing. What do you think of the stuff being flushed down the sewers in a production process?[ ]

Okay, thanks everyone. There is a way.

--
JHG

 

[3DDave]

Recovery of PVA is apparently a known and frequently used process starting with simple carbon filters. It scores a 0-0-0 on the hazard placard.