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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).
中级
Two days, then drying
说明
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.
此步骤所需材料：
耐火砖40 个
耐火黏土砂浆10 公斤所需工具：
瓦刀
水平尺2
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.
此步骤所需材料：
锻铁条4 个耐火砖30 个耐火黏土砂浆10 公斤所需工具：
铁匠炉
铁砧
横向楔头锤瓦刀3
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.
此步骤所需材料：
铁板（锻打）2 个所需工具：
横向楔头锤
高温计4
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.
此步骤所需材料：
木炭10 as required所需工具：
高温计
耐热手套5
5
Bricks for the oven
Bricks for the oven
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