Bearing industry at the present stage of conventional martensitic quenching equipment uneven, from the protection of medium can be divided into no oxidation furnace, medium protection controlled atmosphere furnace and vacuum furnace. No oxidation furnace medium protection accounted for about 25% of SKF bearing heat treatment equipment, protective medium without or little oxidation furnace bearing heat treatment equipment accounted for about 50%, controlled atmosphere furnace accounts for about 20% of bearing heat treatment equipment, vacuum furnace for FAG bearing heat treatment equipment 5%. From the production cycle can be divided into periodic furnace and continuous furnace.
Heating vacuum furnace vacuum heat treatment of bearing
Heating vacuum furnace vacuum state can reduce or avoid the oxidation, cooling with high pressure gas quenching can control the workpiece and deformation, avoid the problem of environmental pollution caused by oil quenching, realize clean heat treatment. In addition, vacuum heat treatment, the microstructure of the workpiece is more fine and uniform, NSK bearing surface and center organization consistent, uniform hardness, conducive to the bearing fatigue life improvement.
Bearing heat treatment production line automation and control accuracy
The degree of automation of production line and high control accuracy, Timken bearing processing quality of the workpiece evenly, use a portion of the whole heat treatment production line can be used as bearing automatic production line. Different heat treatment production line according to the heat treatment of bearing parts and its structure characteristics for different types and sizes, such as mesh belt furnace is suitable for middle and small bearing rings; rotary hearth furnace is suitable for small batch of bearing rings.
The quenching cooling medium and equipment of bearing heat treatment
Bearing quenching medium can be divided into three categories: oil-based, water-based and gas quenching medium. Oil based quenching medium is the most commonly used quenching medium. Quenching oil common is the loss of N32 or N22 system, to improve the cooling performance, aging resistance, light resistance and high temperature properties were added to urge the agent, cleaning agent, brightening agent and antioxidant INA Bearing, formed fast oil, light oil and high temperature rapid isothermal oil series of quenching oil, to for hardened bearing parts of different sizes and requirements.



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