The furnace chamber size should be determined based on the workpiece geometry and loading capacity, with additional space reserved for arranging heating elements. Taking the RX3-60-9 model as an example, the rated temperature is 950°C, the effective chamber dimensions (length × width × height) are 1200 × 600 × 500 mm, and the rated power is 60 kW. During procurement, the relationship between the maximum workpiece dimensions and the chamber size should be verified to avoid blocking heating elements or affecting airflow circulation after loading. The load-bearing capacity of the furnace hearth plate should also be confirmed; this model is designed for a load of 500 kg, and overloading will accelerate damage to the furnace lining.
Temperature uniformity is a key parameter for measuring the temperature difference across various zones of the furnace chamber. For this model, under empty-furnace conditions at rated temperature, tested using the nine-point temperature measurement method, the temperature uniformity is ±8°C. During acceptance, thermocouples should be placed within the effective heating zone of the chamber, and readings at each point should be recorded after the temperature stabilizes. If the uniformity deviation exceeds the specified range, the layout of heating elements, the integrity of the furnace lining, and the correct connection of compensating leads in the temperature measurement system should be checked. In daily use, a sudden deterioration in uniformity is often related to localized aging of heating elements, cracking of the furnace lining, or displacement of thermocouples.
This model uses nickel-chromium alloy resistance wire as the heating element, transferring heat to the furnace chamber through radiation and convection. The resistance heating solution has a simple structure and good spare parts interchangeability, requiring no special tools when replacing heating elements. During procurement, attention should be paid to the designed surface load of the heating elements; this model uses 1.6 W/cm², which helps extend element life. For operation and maintenance, regular checks should be made for broken resistance wires, oxidative scaling, or short circuits caused by contact with the furnace lining. It is recommended to measure the cold resistance of heating elements quarterly and arrange replacement when the deviation exceeds 10%.
The temperature control system uses PID regulation with K-type thermocouples, achieving a control accuracy of ±2°C. During procurement, it should be confirmed that the instrument has over-temperature alarm and thermocouple break protection functions. This model is equipped with an independent over-temperature protection circuit that automatically cuts off heating output when the furnace temperature exceeds the set upper limit. For safety interlock, the heating power is automatically disconnected when the furnace door is opened to prevent misoperation. The electrical control cabinet has a protection rating of IP54, suitable for general industrial workshop environments. It is recommended to specify the brand of temperature control instruments and the thermocouple graduation in the procurement contract to facilitate future spare parts standardization.
The RX3-60-9 industrial electric heating furnace is suitable for processes such as normalizing, annealing, tempering, and pre-weld preheating of metal parts. Typical applications include stress relief treatment of small and medium-sized castings and forgings, mold preheating, and heating before solution treatment of aluminum alloys. Since the furnace atmosphere is air, it is not recommended for unprotected heating of materials sensitive to oxidation. Procurement personnel should verify whether the equipment power and heating rate meet requirements based on the process temperature curve, loading method, and production takt time. The heating time for this model from room temperature to 950°C is approximately 2.5 hours, which can serve as a reference for production scheduling.
