Development of heat treatment technology at home and abroad

Update: 20-07-2020

At present, most of the heat treatment equipment in Eur […]

At present, most of the heat treatment equipment in Europe has adopted gas radiant tubes, which are heated by natural gas. Gas heating technology and equipment are very mature in Europe. Natural gas burners have a standard series, which are manufactured and supplied by professional burner factories. The inner tube of the gas radiant tube is replaced with ceramics to extend the service life and increase the power. Natural gas heating improves energy utilization and reduces production costs.

Foreign heat treatment manufacturers attach great importance to cooling during heat treatment. According to the technical and technological requirements of the product, slow cooling, oil quenching, and one-time gas quenching can be performed. Fast atmosphere circulation cooling uses high-pressure gas injection into the cooling chamber, and the computer controls the flow rate and flow rate changes to achieve the cooling rate within a specific time, so as to achieve the required cooling curve during the heat treatment process and ensure the heat treatment quality of the parts.

The quenching gas used to be cooled by gas quenching in the past was nitrogen, helium, etc. Now it is strongly sprayed with air to cool the workpiece at extremely rapid speed. After quenching, the surface has only a very thin oxide color film, which is grayish white, and the color of the parts is still beautiful. , And save a lot of nitrogen and inert gas, so that the cost of heat treatment is further reduced. Fan cooling, heat exchanger cooling, quenching oil tank cooling and other devices that need to be cooled, all adopt oil-sealed self-cooling, completely replacing the water-cooled circulation system, and the entire heat treatment furnace does not require any cooling water. In the case of oil storage in a small oil tank and natural heat dissipation, the hot oil is cooled and then added to the circulation, so as to completely replace water cooling without fuel consumption and no power.

The combination of vacuum low pressure carburizing and high pressure gas quenching is an advanced carburizing and quenching process today. It has fast carburizing speed, excellent carbide structure, quenching cracking and small deformation, energy saving and carburizing agent raw materials, carburized parts The surface quality is good and it is conducive to environmental protection. The water in the plate heat exchanger of the quenching oil tank is replaced with cooling oil. The cooling oil is heated by the heat exchange of the hot oil. The change in the specific gravity of the oil causes the cooling oil to circulate itself. A heat sink is added to the oil tank on the top of the furnace to match the fan. It can achieve the effect of full oil cooling and save a lot of cooling water.

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