High fidelity air quenching furnace
11-18-2025 Author: KJ technology
High fidelity air quenching furnace is a core equipment in modern heat treatment processes. By combining vacuum environment with high-pressure gas quenching technology, it achieves non oxidation, uniform cooling, and performance optimization of high-end material heat treatment. It is widely used in aerospace, automotive manufacturing, precision machinery, and other fields. The following provides a detailed introduction from five aspects: technical principles, core advantages, application scenarios, equipment composition, and development trends:
1. Technical principles
The core process of high fidelity air quenching furnace is divided into three stages:
Establishment of vacuum environment: By combining a mechanical pump and a diffusion pump, the pressure inside the furnace is pumped to 10 ⁻³~10 ⁻¹ Pa, completely eliminating oxygen and water vapor to prevent surface oxidation and decarburization of the workpiece.
High temperature heating: In a vacuum environment, graphite or molybdenum heating elements are used to uniformly heat the workpiece through thermal radiation, with a temperature of up to 1300 ° C, meeting the phase transformation requirements of materials such as alloy steel and titanium alloy.
High pressure gas quenching: After heating is completed, the furnace is quickly filled with high-purity inert gas (such as nitrogen, argon, or helium) at a pressure of up to 10-20 bar. By using a specially designed nozzle array and high-speed fan (with a wind speed of up to 20m/s), strong turbulence is formed to achieve rapid and uniform cooling of the workpiece, with a cooling rate of 50-100 ° C/s.
2. Core advantages
Non oxidation decarburization: The vacuum environment completely eliminates oxidation and decarburization problems, resulting in higher surface smoothness of the processed workpiece without the need for subsequent polishing or cleaning.
Minimal deformation: Uniform cooling reduces the deformation of the workpiece compared to traditional oil quenching, especially suitable for processing complex structural parts such as thin-walled and sharp corners.
Environmental protection and safety: completely avoiding oil mist pollution and fire risks in the oil quenching process, in line with green manufacturing requirements.
Comprehensive performance improvement: Compared with traditional oil quenching, the service life of mold steel can be extended, and the strength and toughness indicators of materials such as titanium alloy are significantly optimized.
Process flexibility: By adjusting the gas type (nitrogen, argon, helium), pressure, and flow rate, it can meet the processing needs of different materials, such as structural steel, mold steel, high-speed steel, titanium alloys, etc.
3. Application scenarios
Aerospace: Used for heat treatment of titanium alloy components and high-temperature alloy parts to enhance material strength and high temperature resistance.
Automotive industry: Processing key components such as precision gears and molds to ensure dimensional stability and wear resistance.
Medical devices: Processing stainless steel precision parts to meet biocompatibility and surface finish requirements.
Tool manufacturing: For materials such as high-speed steel and mold steel, achieve bright quenching and vacuum tempering to improve the service life of tools.
4. Equipment composition
Furnace structure: Double layer water-cooled wall design, lined with multiple layers of metal radiation screens (molybdenum or stainless steel), using metal sealing rings to ensure high-pressure airtightness.
Gas circulation system: including high-pressure gas tank group, heat exchanger, Venturi nozzle, etc., to achieve rapid gas circulation and uniform distribution.
Control system: Adopting PLC automatic control of the entire heating insulation quenching process, supporting multi parameter closed-loop adjustment of pressure, temperature, and flow rate, and equipped with a data recording and traceability system.
