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Discussion on Bearing Heat Treatment Method

The quality control of the heat treatment of bearing ring parts is relatively strict in the entire machinery industry. In order to reduce the heat treatment deformation and improve the life of the bearing ring parts, the heat treatment process of the bearing ring parts should be strictly controlled.

 I. The first factor that affects the heat treatment quality of bearing ring parts is the person. People's quality awareness, heat treatment expertise, operating skills, and emotions play an important role:

1 Guide operators to love heat treatment work, based on heat treatment positions, and strive to learn and improve heat treatment expertise and operation skills;

2 Improve people's quality awareness, make everyone pay attention to quality, and focus on quality from the details of each heat treatment operation;

3 Strengthen the professional training of heat treatment operators, and issue heat treatment "post qualification certificate" and "equipment operation certificate" after passing the examination, and insist on holding the certificate to work;

2. Periodic calibration, testing, testing, use, maintenance and safe operation of heat treatment equipment, quenching medium and testing instruments:

1 Regardless of domestic and imported heat treatment equipment, the accuracy of the temperature in the furnace heating effective zone, the accuracy of the holding time, and the control of the protective atmosphere in the furnace are important factors that determine the quenching and heating quality of the bearing ring parts;

2 The quality, temperature, and quenching cooling time of the quenching medium are the key factors to ensure the quenching and cooling quality of the bearing ring parts;

3 References to the Regulations for Furnace Temperature Uniformity Calibration, Provisions for Furnace Temperature Calibration, Provisions for Hardness Meter Calibration, Provisions for Heat Treatment Tank Liquid Testing, Heat Treatment Equipment, Quality control documents such as "safety work instructions" for testing instruments, "work instructions" for various heat treatment processes, use and maintenance of heat treatment equipment, quenching media and testing instruments, and ensure that furnace temperature, quenching media and testing instruments are accurate and reliable. It is necessary to guarantee the heat treatment quality of bearing ring parts.

Selection of bearing steel material:

1. The oxygen content index of good domestic bearing steel materials and foreign bearing steel materials is still close, but the main difference lies in the particle size and distribution of non-metallic inclusions and carbides. However, the particle size and distribution of non-metallic inclusions in bearing steel materials produced in China are very uneven. Some fields of view do not have a non-metallic inclusion, and some fields of view appear in large numbers. The probability of occurrence is frequent, and the particle size is large. This explains from one aspect why our country uses the bearing steel material of the same furnace number and the bearing products produced by the processing equipment produced by Dou have a large difference in service life. The ratio of the life of the bearings varies by dozens of times, or even hundreds of times.

2 In order to improve bearing life and reliability, through the improvement of heat treatment process, the ordinary annealing is changed to isothermal annealing. This is also the method adopted abroad, which has a good effect. In developed countries such as the United States, Sweden, and Japan, research on improving the metallurgical quality of bearing steel is done jointly by the two industries, because whether the metallurgical quality of the bearing steel material is improved does not depend on one or more simple metallurgical qualities. The index can fully explain the problem, and the criterion is whether it can improve the service life and reliability of the bearing. 3 The use of bearing steel material processed by the correct forging and cold rolling process to produce quality bearings can greatly improve the reliability and life of the bearing.

4 Selecting high-quality bearing steel materials is the key to improving the quality of bearing heat treatment. There is no guarantee of high-quality bearing steel materials. Improving bearing reliability and life will be empty words.

Fourth, heat treatment process method:

1 Through the adjustment and control of process parameters such as quenching, cleaning, tempering temperature and time, the content of retained austenite in the bearing ring is reduced, the toughness and wear resistance of the bearing ring parts are improved, and the expansion coefficient is controlled as required Within the range, it can improve the performance of the bearing without increasing the noise after multiple installations, and also improve the reliability and service life of the bearing;

2 Utilizing the structural characteristics of the mesh belt furnace, through the adjustment and control of the quenching temperature and oil temperature, the thermal stress of the bearing ring parts during quenching can be reduced, and the deformation of the thin-walled and large-sized bearing ring parts can be greatly reduced;

3 It is also possible to use preheating methods such as normalizing and high temperature tempering to make up for the gap with foreign bearing steel materials. It has certain effects on improving the reliability and life of the bearing, but it will increase some production costs. As an emergency method;

4 Carburizing, carbonitriding, cold treatment, ion implantation, surface coating, intermediate frequency quenching, bainite isothermal quenching and other advanced heat treatment processes can significantly improve the impact toughness, microhardness and contact fatigue life of bearing ring parts , Wear resistance and service life, the company can use these heat treatment technologies to develop new bearing products when conditions permit;

5 Four sets: "fixed operators, fixed heat treatment equipment, fixed process regulations, fixed work instructions" is an important measure for the quality assurance of bearing ring parts heat treatment. Only operators can strictly operate in accordance with the technical regulations and work instructions. Ensure the heat treatment quality of bearing ring parts;

6 Standardize, standardize and simplify the complex heat treatment technology, and strive to make the process rules and operation instructions simple and easy to understand so that the heat treatment operator understands what to do and how to do it.

V. The clean and orderly heat treatment environment is also important to improve the heat treatment quality of bearing parts:

1 Some seemingly trivial and superficial things such as order, cleanliness, placement, classification, and hygiene at the heat treatment production site reflect human literacy. At the same time, it affects people's work and quality of life, including work efficiency, Product quality and even mood and health;

2 Promote 6S management, put forward requirements for the daily behavior of heat treatment operators, advocate starting from small things, and strive to make every employee get rid of sloppy hearts and develop a serious work attitude in order to achieve the improvement of human quality and overall work Purpose of quality

3 Tidying, tidying, cleaning, cleaning, literacy and safety are maintained well and become habits.

Yandian Industry Park, Linqing City, Shandong Province

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