Normal-pressure nitrogen and water mixed gas jet quenching device

Abstract

The invention relates to a normal-pressure nitrogen and water mixed gas jet quenching device, comprising an air compressor, an oil-water separator, a dryer, a nitrogen machine, a supercharger and a controller, an air storage tank 1, an air storage tank 2, an air storage tank 3, an air storage tank 4, an air storage tank 5 and the like, wherein the air storage tank 4 and the air storage tank 5 areconnected with a cooling device and an atomization device. The mixture mixed with nitrogen and atomized water vapor according to a certain ratio is taken as a quenching medium, and is jetted to the surface of a workpiece at a certain speed by the cooling device so as to reduce the temperature of a test piece, thus reaching the purpose of quenching. On one side, the device can solve the deformation and stress of the workpiece caused by too rapid cooling speed during water quenching, on the other side, the requirement of pure gas quenching for a vacuum high pressure device during reaching the effect of water quenching can be satisfied. The quenching device has the characteristics of simple equipment, environmental protection and energy conservation, small deformation and stress of the quenching piece and controllable quenching process and parameters, can automatically control the process flow of quenching through combining a computer, and can realize local quenching.

Description

technical field [0001] The invention relates to a heat treatment quenching device, in particular to a nitrogen and water mixed gas injection quenching device at normal pressure. Background technique [0002] Gas quenching technology has the characteristics of cleanness and environmental protection, small workpiece distortion, low energy consumption, controllable process and parameters, etc., and has attracted the attention of the international heat treatment industry. However, the current research shows that since the heat transfer coefficient of gas is generally smaller than that of oil and water-based media, if high-pressure gas quenching wants to achieve the hardness effect after water quenching, strict requirements for vacuum high-pressure quenching equipment must be considered. It will increase the cost; and in the early stage of water quenching, a liquid film will be formed between the water and the workpiece, and the air contained in the liquid film can slow down the ...

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Problems solved by technology

However, the current research shows that since the thermal conductivity of gas is generally smaller than that of oil and water-based media, if high-pressure gas quenching wants to achieve the hardness effect after water quenching, strict requirements for vacuum high-pressure quenching equipment must be considered. It will increase the cost; and in the early stage of water quenching, a liquid film will be formed between the water and the workpiece, and the air contained in the liquid film can slow down the heat conduction between the water and the workpiece, thereby reducing the heat transfer coefficient between the water and the workpiece , resulting in a small heat transfer coefficient in the early stage of water quenching

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