An automotive supplier will use a two-zone conveyor oven to stress relieve automotive springs. The natural-gas-fired unit, supplied by Wisconsin Oven Corp., has the design capacity to heat approximately 11,000 lb of springs per hour.
The oven was manufactured with bottom-up airflow to maximize heating rates and temperature uniformity based on the part load configuration. Profile curtains are located at both ends of the conveyor to reduce heat spill-out. The continuous belt conveyor system utilizes a variable frequency drive to provide adjustable speed control.
The maximum operating temperature is 650°C (1202°F) with guaranteed temperature uniformity of ±5°C at setpoints of 520°C (968°F) and 570°C (1058°F) to ensure the conveyor oven meets CQI-9, 3rd edition process Table E for stress relieving/annealing.