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5 kinds of bearing heat treatment methods

Author: hongyuanTime:

1.Controlled atmosphere heat treatment

Controlled atmosphere heat treatment is mainly anti-oxidation and decarburization, and accurate control of carburizing and nitriding.At the end of the 1980s, it began to be used in industrial production and is now widely used.Combined with the characteristics of the Chinese market, the domestic and foreign equipment manufacturers have introduced all kinds of new controlled atmosphere heat treatment furnaces with various functions.Large, such as Ipsen company sealed box multi-purpose furnace, Fengdong’s automatic intelligent sealed box multi-purpose furnace production line can not only meet carburizing, carbonitride, but also can achieve bright quenching, bright annealing and other heat treatment processes.Can achieve computer aided design, production management, logistics management, field control, quality management, process management and other series of work.At the same time to change the past heat treatment workshop “dirty, messy, poor” situation, instead of simple, bright.

Of course, these production lines are expensive and are suitable for mass production, such as in the automotive industry.Domestic manufacturers are close to user requirements, targeted to launch a variety of moderate price, various styles, superior performance of controllable atmosphere furnace.Most of the process parameters can be optimized, predicted and accurately control the distribution of carbon concentration to obtain the ideal concentration distribution and infiltration layer organization, which can be realized by computer management, with simple menu design and friendly man-machine interface.

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2.Vacuum heat treatment

Vacuum heat treatment is a new heat treatment technology that combines vacuum technology and heat treatment technology. The vacuum environment in which the vacuum heat treatment is located refers to the atmosphere environment under one atmosphere pressure, including low vacuum, medium vacuum, high vacuum and ultra-high vacuum. Vacuum heat treatment actually belongs to the atmosphere control heat treatment.The application and development of vacuum heat treatment technology has been further improved and promoted. It has the characteristics of no oxidation, no decarburization, clean and bright surface of workpiece after quenching, high wear resistance, no pollution and high degree of automation.Heat treatment technologies such as vacuum annealing, vacuum degassing, vacuum oil quenching, vacuum water quenching, true air quenching, vacuum tempering and vacuum carburizing have been widely used in industrial production.

3.Induction heat treatment and ion nitriding heat treatment technology

Induction heat treatment with high efficiency, energy saving, cleaning, flexibility and other advantages are widely used in automotive industry, engineering machinery, petrochemical industry and other industries.Nearly 40% of auto parts can be treated by induction heat treatment, such as crankshafts, gears, universal joints, half-shafts, etc.The use of induction heating, many products processing can be built into automatic or semi-automatic production lines, improve the stability of product quality, reduce labor intensity and beautify the working environment.Domestic development is the fastest induction heating power supply, the old electronic shock tube has completed its historical mission, replaced by all transistors.Adopts the microcomputer control transistor to adjust the power supply, the adjustment is stable and convenient, the precision is high, and the interference to the harmonic of the power network is greatly reduced.In recent years, the development of solid-state high-frequency heating device, its advantages are obvious, it no longer use high price, easy to damage, energy consumption of the tube and the supporting use of the anode booster transformer, anode water jacket, filament regulator, etc., instead of MOSFET power electronic devices: it saves one-third of the electricity, water saving half.And with the heating power supply supporting quenching machine, has also made considerable progress.Embodied in:

① The number of machine tool manufacturers has increased significantly. It turned out to be a unique show in Tianjin No. 9 Machine Tool Factory.

② The precision, stability and automation of quenching machine are greatly improved.

③ The technical level of targeted professional quenching machine tools has been brought into play.

Ion nitriding technology is characterized by clean surface of parts after treatment, corrosion resistance, small deformation and high wear resistance.Compared with gas nitriding, it has the advantages of short cycle, high efficiency and less pollution.In recent years, the development of ion nitriding is rapid, especially the advent of ion nitriding furnace pulse power supply, it will discharge physical parameters (voltage, current, pressure) and temperature control parameters (pulse width) separate.The process adjustability is increased, and the process parameters are easy to be selected and accurately controlled.

4.Quenching medium and cooling technology

①The ideal quenching medium should have the following characteristics:

Quality type: high temperature phase fast cooling, low temperature phase slow cooling.That is to eliminate cracks and reduce quenching deformation.

② Environmental protection type: no toxic, harmful smoke or gas volatilization, not easy to burn, easy to clean after quenching, no corrosion to the equipment, no irritation to burn the skin.

③ stable type: workpiece quenching performance uniform stability, the medium itself in a certain period of stable performance.

④ Economic type: high quality and high price, small energy consumption.

5.Adopts the new surface strengthening technology and popularizes the nitrogen base atmosphere heat treatment

The original tool surface treatment methods are limited to the old methods such as steam treatment and oxygen nitriding, which can only increase the tool life by 30%~50%.Since 1980s, China has independently developed and imported QPQ salt bath composite treatment technology and PVD titanium oxide physical coating technology.The former can stably improve the tool life 2~3 times, simple equipment, low cost, especially suitable for dry common tools;The latter can improve the tool life 3~5 times, suitable for all kinds of precision expensive gear cutting tools.

Nitrogen-based atmosphere for protective heat treatment and chemical heat treatment, can achieve no oxidation decarbonization heat treatment, and can avoid heat treatment nitrogen brittle, nitrogen based atmosphere chemical heat treatment, can reduce internal oxidation and other defects, improve the quality of chemical heat treatment.

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