The principle of a vacuum quenching furnace is to heat the workpiece to the quenching temperature under a vacuum. When cooling is required, nitrogen is first introduced into the furnace to start the fan. After normal air operation, the gas is fed into the furnace and the workpiece is cooled through a heat exchanger, with air delivered via ducts for quenching.
The vacuum quenching furnace adopts a horizontal structure with two or three chambers and is equipped with a horizontal operation mechanism and vertical lifting mechanism driven by either hydraulics or a motor. It has hot vacuum zones for flip plates or insertion plates, graphite or nichrome strip heating elements, full carbon felt insulation screens, and the cooling chamber can optionally use 2-bar pressure cooling. The vacuum level can be selected as needed, ranging from 10⁻¹ Pa to 10⁻⁵ Pa. It supports atmospheric carburizing or pulse carburizing, providing fast carburizing speed, high-quality carburized layers, and deep carburizing capability. The main instruments and components of the electrical control system are all imported, enabling automated operation.