Drop-bottom heat treatment furnaces are used for the solution heat treatment of aluminium alloys. Drop-bottom furnaces can be built in various sizes according to customer requirements. These furnaces are typically used when very short water quenching times are required, as solution heat treatment and quenching are integrated into one controllable operation.
A drop-bottom furnace stands on a platform while the quenching tank is positioned below. The furnace platform moves horizontally for the quenching process. Guided by wire cables, the loaded basket drops into the quenching tank. The lifting system can be controlled automatically or semi-automatically. Heating is provided by recuperative burners or hairpin resistors.
Depending on the material cross-section, the average solution period is as follows:
- Heating from 20 °C to 540 °C in 1.5 hours,
- Quenching for 7 seconds (as the doors start to open)
- Holding at 540 °C for 4-5 hours (max. furnace temperature is 650 °C).
Sistem Teknik builds Class 1 furnaces according to AMS 2750E process specifications.