The burnout cycle on a furnace is not designed to remove oxides.
Instead, it is meant to remove materials such as oils, lubes, and base-metal outgassing products that may have condensed on the furnace walls over time.
This cycle is called a bake-out cycle.
It involves heating the furnace to a high temperature, holding it for a specific duration, and then cooling it down.
7 Key Points to Know About the Burnout Cycle on a Furnace
1. Purpose of the Bake-Out Cycle
The primary purpose of the bake-out cycle is to clean the internal components of the furnace.
This prepares the furnace for the next process cycle.
2. Temperature and Duration
During a bake-out cycle, the furnace is heated to around 2400°F.
It is held at that temperature for two hours.
Afterward, it is vacuum cooled to around 1800°F and then gas fan cooled to ambient temperature.
3. Leak-Rate Check
A bake-out cycle is also an opportune time to perform a leak-rate check.
The leak rate is the rise in vacuum level over a period of time.
Checking it helps to ensure the integrity of the furnace.
4. Regular Maintenance
Regular maintenance of the furnace, including performing a dry run cycle at least once a week, is recommended.
This dry run cycle helps to keep the furnace clean.
It can be particularly important before processing critical work or materials that are prone to contamination.
5. Consistent and Reproducible Results
By following predetermined temperature profiles and heating cycles, burnout furnaces offer consistent and reproducible results in casting.
This helps to reduce variability between castings and enhances production efficiency.
6. Safety and Environmental Considerations
Safety and environmental considerations are taken into account in the design of burnout furnaces.
They are equipped with ventilation systems to remove gases and fumes generated during the burnout process.
This ensures a safe working environment for operators.
The controlled and efficient elimination of wax patterns or organic materials also reduces the environmental impact associated with these materials.
7. Regular Cleaning
Regular cleaning of the hot zone, including performing bake-out cycles, is important to maintain the furnace's performance.
Signs of color change in the insulators or buildup inside the gas nozzles may indicate the need for an additional bake-out cycle.
Continue exploring, consult our experts
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