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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).
Intermediate
Two days, then drying
Instructions
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.
Materials for this step:
Firebricks40 pieces
Refractory Clay Mortar10 kgTools needed:
Mason Trowel
Spirit Level2
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.
Materials for this step:
Wrought Iron Bar4 piecesFirebricks30 piecesRefractory Clay Mortar10 kgTools needed:
Blacksmith Forge
Anvil
Cross Peen HammerMason Trowel3
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.
Materials for this step:
Iron Sheet (Hammered)2 piecesTools needed:
Cross Peen Hammer
Pyrometer4
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.
Materials for this step:
Charcoal10 as requiredTools needed:
Pyrometer
Heat-Resistant Gloves5
5
Bricks for the oven
Bricks for the oven
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Materials
5- 40 piecesPlaceholder
- Placeholder
- 4 piecesPlaceholder
- 2 piecesPlaceholder
- 10 as requiredPlaceholder
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