Hub-unit roller-type tempering furnace shipped to Zhejiang Zhaofeng, with a discharge conveyor equipped with spray rust protection.

The roller-type tempering furnace for wheel hub units is a piece of equipment used for the heat treatment of wheel hub assemblies. The following section provides a detailed overview from the perspectives of its operating principle, structural configuration, performance characteristics, and application scenarios:

Working Principle

Mesh-belt conveying: The hub-unit workpieces are conveyed on a continuously operating mesh belt, which is supported and driven in synchronous rotation by idler rollers. This ensures stable and smooth operation, effectively reduces belt tension, and extends the service life of the mesh belt.

Temperature-Controlled Heating: A temperature-control system precisely regulates the temperature of the heating zone, enabling the wheel hub assembly to undergo tempering under specified temperature conditions. This process eliminates quenching stresses, stabilizes the microstructure and dimensions, and enhances the overall performance of the wheel hub assembly.

Structural Composition

Heating System: The heating system typically employs electric radiant tubes and gas burners as heating elements to supply the heat required for the tempering process. These heating elements are evenly distributed throughout the furnace chamber to ensure uniform temperature distribution. For example, plug-in electric radiant tubes are easy to replace, and when powered by a low-voltage transformer, their service life can be further extended.

Mesh belt conveyor system: This system consists of a mesh belt, idler rollers, a drive motor, a reducer, and other components. The idler rollers support the mesh belt, while the drive motor, via the reducer, powers the belt to convey hub units continuously. The mesh belt is typically woven from high-strength stainless steel wire, offering excellent strength and corrosion resistance.

Furnace Chamber Structure: The furnace chamber is the main body of the tempering furnace and is insulated with high-quality thermal insulation materials to minimize heat loss and enhance thermal efficiency. The furnace lining is entirely made of aluminosilicate material, which offers excellent thermal insulation performance and effectively reduces energy consumption.

Temperature Control System: Equipped with high-precision temperature sensors, controllers, and other instrumentation to enable real-time monitoring and control of the furnace temperature, ensuring temperature control accuracy within ±1°C and meeting the process requirements for hub unit tempering.

Atmosphere Control System: Some roller-type tempering furnaces for wheel hub assemblies are also equipped with an atmosphere control system that allows the introduction of a protective atmosphere—such as nitrogen or hydrogen—into the furnace. This prevents oxidation and decarburization during the tempering process, thereby ensuring superior surface quality of the workpieces.

Performance Features

Energy Efficiency: The continuous operation of the mesh belt enables batch processing of hub units, thereby enhancing production efficiency. In addition, a preheating chamber is installed at the front end of the quenching furnace to utilize the waste heat from the returning mesh belt for preheating workpieces, further reducing energy consumption.

Excellent temperature uniformity: A large-impeller forced-circulation fan is employed to increase airflow velocity, thereby enhancing heat transfer efficiency and achieving high furnace temperature uniformity. This effectively ensures consistent tempering quality across all areas of the wheel hub assembly.

High degree of automation: The entire equipment suite is centrally controlled by a PLC, enabling automated processes such as material loading, conveying, heating, tempering, and unloading, thereby reducing manual intervention and enhancing the stability of the production process.

Long service life: The use of high-strength stainless steel wire braided mesh belts, coupled with high-quality heating elements and thermal insulation materials, ensures a long equipment lifespan and reduces maintenance costs.

Safety: Various safety protection devices are installed, including over-temperature alarms, belt-operation anomaly alarms, and leakage protection, to ensure the equipment operates safely and reliably.

Application Scenarios

Automotive wheel hub manufacturing: primarily used for tempering treatment of automotive wheel hub assemblies to enhance strength, toughness, and wear resistance, thereby ensuring the safety of the wheel hub during vehicle operation.

Motorcycle Wheel Hub Manufacturing: In the production of motorcycle wheel hubs, roller-type tempering furnaces can be used to perform tempering treatment on the hub assemblies, thereby enhancing their quality and performance and meeting the demands of high-speed motorcycle operation.

Other Applications: In addition to the automotive and motorcycle wheel hub manufacturing industries, this process can also be applied to other sectors that require tempering of wheel hub assemblies, such as construction machinery, aerospace, and electric vehicles.