Drop-bottom heat treatment furnaces are used for solution heat treatment on 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, and they integrate solution heat treatment and quenching into one controllable operation. The drop-bottom furnace stands on a base so that a quenching tank can be positioned directly below the furnace. For the quenching process, the furnace bottom moves horizontally to the side. Guided by wire cables, the loaded basket drops out of the furnace into the quenching tank. The lifting system can be controlled automatically or semi-automatically.
Depending on the material cross-section, the average solution period is as follows:
- Heating from 20 °C to 540 °C in 1.5 hours,
- Holding at 540 °C for 4-5 hours.
The material is dipped into the quenching tank for a total of 7 seconds (from the moment the door starts to open). The maximum temperature of the furnace is 650 °C. Heating is provided by recuperative burners or hairpin resistors.
Sistem Teknik builds class 1 furnaces according to AMS 2750E process specifications using all the technologies listed above.