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Annealing Oven: a Firebrick Chamber over a Firebox
Annealing is holding work hot and letting it cool slowly so it loses its stresses or softens. Glass is held at about 454–482 °C for most kinds, then cooled slowly; metal is often left to cool in the oven with the fire out. Build a firebrick chamber over a small firebox, with a door, a damper and a pyrometer, so it can be held at heat and then shut up to cool.
The picture: putting bottles into the annealing oven at a glass works, 1908 (Lewis Hine).
Kati
Two days, then drying
Maagizo
1
1
Lay the firebox
Lay the firebox
On a level base, lay firebricks in refractory mortar for a small firebox with an opening for fuel and air.
Vifaa kwa hatua hii:
Matofali yanayostahimili moto40 vipande
Chokaa cha udongo unaostahimili moto10 kgZana zinazohitajika:
Mwiko wa mwashi
Rulani ya Maji2
2
Grate and chamber
Grate and chamber
Forge iron bars to lay across the top of the firebox as a floor with gaps for the heat, and build the chamber walls on it, leaving a flue hole in the roof.
Vifaa kwa hatua hii:
Ufito wa chuma kilichofuliwa4 vipandeMatofali yanayostahimili moto30 vipandeChokaa cha udongo unaostahimili moto10 kgZana zinazohitajika:
Fua ya mhunzi
Fuawe
Nyundo yenye kichwa cha msalabaMwiko wa mwashi3
3
Door, damper and pyrometer
Door, damper and pyrometer
Fit an iron-sheet door lined with brick and a sliding sheet damper over the flue. Set the pyrometer through the side wall into the chamber.
Vifaa kwa hatua hii:
Bamba la chuma (lililofuliwa)2 vipandeZana zinazohitajika:
Nyundo yenye kichwa cha msalaba
Kipima joto kali4
4
Dry and first firing
Dry and first firing
Let the mortar dry for several days, then fire gently with charcoal and raise the heat slowly. Practise holding the chamber at the heat you need, and shutting door, damper and firebox to cool it down slowly.
Vifaa kwa hatua hii:
Mkaa10 as requiredZana zinazohitajika:
Kipima joto kali
Glavu Zinazostahimili Joto5
5
Bricks for the oven
Bricks for the oven
Inapakia daftari la Jupyter…
Vifaa
5- 40 vipandeKishikilia Nafasi
- Kishikilia Nafasi
- 4 vipandeKishikilia Nafasi
- 2 vipandeKishikilia Nafasi
- 10 as requiredKishikilia Nafasi
Zana Zinazohitajika
7- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
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