System Composition of Complete Gas-Fired Walking Beam Axle Quenching & Tempering Production Line

2026-10-14 17:06:34

1. Loading Rack & Cross Transfer Feeding Mechanism

Including material rack, separating device and roller conveyor. It automatically loads and positions workpieces one by one. A magnetic particle inspection station can be installed upstream to reject blanks with cracks.

2. Gas-Fired Walking Beam Quenching Heating Furnace (Core of Main Line)

• Heat source: Natural gas, equipped with high-speed low-NOx burners and air preheat heat exchanger for waste heat recovery and energy saving.

• Furnace zoning: Preheating zone, heating-up zone and soaking & holding zone; multi-zone independent PID temperature control.

• Conveying: Hydraulically driven walking beam (alternating movement of fixed beam and moving beam) with heat-resistant cast steel supporting teeth. The walking beam supports the axle workpieces, which rotate slightly during stepping movement to achieve uniform circumferential heating.

• Furnace pressure: Slight positive pressure control to prevent cold air infiltration and reduce oxidation & decarburization.

3. Quenching Transfer and Cooling Unit

Comprising discharge cross transfer trolley, turnover roller table, immersion quenching tank (water or polymer quenchant), quenchant temperature control & filtration circulation system and water control mechanism. The transfer time from furnace discharge to workpiece immersion shall be ≤30s to avoid insufficient hardening caused by temperature drop.

4. Intermediate Transfer Mechanism

Hydraulic cross transfer trolley, used to transport water-controlled axles after quenching into the gas-fired tempering furnace.

5. Gas-Fired Walking Beam Tempering Furnace

Also heated by gas burners and equipped with walking beam conveying system. Its tempering temperature is lower than that of the quenching furnace. Heat preservation is adopted to eliminate internal quenching stress and obtain tempered sorbite structure.

6. Post-Tempering Cooling Station

Spray or immersion cooling bed to cool workpieces down to the process temperature and temper brittleness is inhibited.

7. Auxiliary Utility Systems

Natural gas pressure regulating & metering station, combustion air blower, flue gas waste heat recovery heat exchanger, furnace hydraulic station, Circulating Cooling Water System, flue gas emission & low-nitrogen environmental protection device, water vapor collection system for quenching tank.

8. PLC+HMI Distributed Electric Control System

Functions include recipe storage, real-time recording of furnace temperature curves, traceability of process data, interlock protection of actions, audible & visual fault alarm. It supports automatic operation and manual inching commissioning.