vacuum furnace

[ansyolitico]

Hi.
about a vacuum light casting oven, so a maximum of 800 degrees.

My problem is to understand how to couple electrical resistance and crucible

I thought I'd put those candles on the crucible crown, stainless steel crucible. but increasing the temperature the hole and the candle should have the same expansion coefficient and the same heat gradient.

or coil a spiral-made kenthal wire. However doing the crucible should be made of a non-conductor material

I also saw that there are ring resistances.

or avoid a combination with the crucible and directly insert a resistance in the crucible in direct contact with the material to melt. But so I see a lot of tricky doing the thermocouple work well, when it comes to the initial phase where the fuse does not get

but the casting furnaces for light alloys, like those for goldsmiths as they are made? induction? does not exist a resistance solution? and above how do you induction detect temperature with a thermocouple since you are immersed in an electromagnetic field?

 

[TETRASTORE]

I deduce that your request refers to a diy project, so for the fuselage oven you can draw from this simpler solution:
- how to make an electric foundry for metal casting - part 1
- how to make an electric foundry for metal casting - part 2or from this most complete:
- how to make an electric furnace (foundry) for metal casting part 1 by vogman
- how to make an electric furnace (foundry) for metal casting part 2 by vogman
- how to make an electric furnace (foundry) for metal casting part 3 by vogmanAs for the vacuum chamber, you can see this other video:
- diy vacuum casting table build

 

[Marco F inox]

as electrical resistances are already isolated (if not), you may also think of a system as visible in the figure, where;
- a metal cylinder with a perforated bottom, it is easy to achieve.
- an insulating panel, for example rock wool, is commercial.
-a solenoid resistance around the crucible, (not spiraling as you say) relishes also manually.
- it is not necessary that the resistance is in contact with the crucible, because it heats air and, it would be facilitated extraction.
- thread the probe into a closed tube at the top end, but drowned inside the crucible, it's like having it inside the molten metal.
- the lower centring tube and three upper circumferential points, place the crucible always and however in axial way.
Ultimately, it's like making a bathroom heating.

 

[Vittorio]

Light fusions under vacuum

Hi.
My personal curiosity:
I have always heard of vacuum die casting, and in this case the aluminum is collected in the mold and with special machines the vacuum is created in the mold in order to eliminate porosity in the piece with structural advantages.
I know there are vacuum furnaces for thermal treatments with its advantages.
but why do you have to melt the lingotto (if I didn't understand badly) with the vacuum? What are the benefits?

 

[Vittorio]

My personal curiosity:

Before asking the question I had to document
I may have understood the reason for the vacuum furnace and therefore I answer my question

from what I understood reading.. in the oven there is still the mold.

this treatment has the value to return a piece in which distortions are minimized. can therefore be used also for the treatment of precious metals, or in any case for each object where the precision of forms is fundamental.

We hope that Öansyolitico I'm sorry.

 

[TETRASTORE]

but the casting furnaces for light alloys, like those for goldsmiths as they are made? induction?

in this thesis you will find detailed all the process adopted by a goldsmith company that produces jewelry, from design to realization, including the entire production process from lost wax casting under vacuum, materials and the software and equipment used."study, analysis, experimental validation and industrial application of the simulation of the lost wax casting process of precious metals. "
quotation @vittori:
but why do you have to melt the lingotto (if I didn't understand badly) with the vacuum?reply: the vacuum is not applied in the melting phase, but in the casting phase; this for the reasons you have already intuited and listed.