The first factor affecting the heat treatment quality of bearing ring parts is people. People's quality awareness, heat treatment expertise, operating skills, emotions, etc. play the most important role:

1 Guide operators to love heat treatment work, base on heat treatment posts, and strive to learn and improve heat treatment professional knowledge and operating skills;

2 Improve people's quality awareness, make everyone pay attention to quality, and pay attention to quality from every detail of heat treatment operation;

3 trengthen the professional training of heat treatment operators, issue the Post Qualification Certificate and Equipment Operation Certificate for heat treatment after passing the examination, and insist on working with certificates;

4 .Encourage the heat treatment operators to participate in the national heat treatment professional qualification examination, and the company can provide training and guidance;

5 .Strengthen the training of enterprise culture and safety culture, improve the overall quality and consciousness of people, form good habits, and do not affect the heat treatment quality of bearing ring parts due to emotional instability;Stabilizing the team of heat treatment operators, stabilizing people's hearts emotionally and politically, leaving behind those who love heat treatment, and making joint efforts to improve the heat treatment quality of bearing ring parts.

Regular calibration, testing, detection, 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 furnace heating effective zone temperature, holding time and furnace protective atmosphere control are important factors to determine the quenching and heating quality of bearing ring parts;

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

3 Use and maintain the heat treatment equipment, quenching medium and testing instruments by quoting the quality control documents such as Regulations on Furnace Temperature Uniformity Verification, Regulations on Furnace Temperature Verification, Regulations on Hardness Tester Verification, Regulations on Testing of Heat Treatment Bath Solution, Safety Operation Instructions for heat treatment equipment and testing instruments, and Operation Instructions for various heat treatment processes in the heat treatment quality control methods for aviation parts, It is necessary to ensure the accuracy and reliability of furnace temperature, quenching medium and inspection instruments for the quality assurance of heat treatment of bearing ring parts.

Selection of bearing steel materials:

1 The oxygen content index of the best bearing steel made in China is close to that of foreign bearing steel, but the main gap lies in the particle size and distribution of non-metallic inclusions and carbides. The crystal structure of bearing steel, the particle size and distribution of non-metallic inclusions and carbides are the main factors affecting the service life and reliability of bearing products in China. Only by making breakthroughs in this regard can the quality of bearing steel and bearing products in China really reach a new level. From the analysis of the physical quality of foreign bearing steel materials in recent years, it is found that the non-metallic inclusions in the bearing steel materials produced abroad are, to a large extent, superior to those produced in China in terms of particle size and uniformity of distribution. The vast majority of non-metallic inclusions in bearing steel produced abroad are distributed in a fine, dispersed and uniform state, especially for oxides and point shaped undeformed inclusions that seriously affect the service life and reliability of bearings. However, the particle size and distribution of non-metallic inclusions in bearing steel produced in China are very uneven. Some fields of view have no non-metallic inclusions at all, and some fields have a large number of non-metallic inclusions. The probability of occurrence of point shaped undeformed inclusions is not only frequent, but also the particle size is large, which explains why our country uses bearing steel materials with the same heat number from one side, There are great differences in the service life of the bearing products produced by Duochan's processing equipment. The ratio of bearing life is dozens of times, or even hundreds of times.

2 In order to improve the bearing life and reliability, it is necessary to cooperate with the upstream bearing steel pipe factory. Through the improvement of the heat treatment process, ordinary annealing is changed to isothermal annealing, which is also a method adopted abroad and has a good effect. In developed countries such as the United States, Sweden and Japan, the research on improving the metallurgical quality of bearing steel is jointly completed by the two industries, because whether the metallurgical quality of bearing steel can be improved is not completely explained by one or several simple metallurgical quality indicators. The real and only criterion is whether the service life and reliability of bearings can be improved. In addition, such cooperation makes up for the shortcomings of both parties, so that metallurgical technicians can know the characteristics of bearings and improve smelting process and quality control indicators according to their characteristics.

3. Using bearing steel processed by correct forging and cold rolling process to manufacture high-quality bearings can greatly improve the reliability and service life of bearings.

4 Selection of high-quality bearing steel is the key to improve the quality of bearing heat treatment. Without high-quality bearing steel as a guarantee, improving the reliability and life of the bearing will be an empty talk.

 Heat treatment process method:

1. Through the adjustment and control of quenching, cleaning, tempering temperature and time and other process parameters, the content of residual austenite in bearing rings can be reduced, the strength, toughness and wear resistance of bearing ring parts can be improved, and the expansion coefficient can be controlled within the required range, which can improve the performance of bearing without increasing noise after multiple installation, and also improve the reliability and service life of bearing;

2. With the structural characteristics of mesh belt furnace, the thermal stress of bearing ring parts during quenching can be reduced by adjusting and controlling the quenching temperature and oil temperature, which can greatly reduce the deformation of bearing ring parts of thin-walled and large size models;

3 Preparation heat treatment methods such as normalizing and high temperature tempering can also be used to fill the gap with foreign bearing steel materials, which has a certain effect on improving the reliability and service life of bearings, but will increase some production costs. The company can also use them as an emergency method when conditions permit;

4 Advanced heat treatment processes such as carburizing, carbonitriding, cold treatment, ion implantation, surface coating, medium frequency quenching, bainite isothermal quenching, etc. can significantly improve the impact toughness, microhardness, contact fatigue life, wear resistance and service life of bearing ring parts. When conditions permit, the company can use these heat treatment technologies to develop new bearing products;

5 Four fixations: "fixed operators, fixed heat treatment equipment, fixed process procedures and fixed operation instructions" are important measures to ensure the heat treatment quality of bearing ring parts. Only when the operator strictly operates in accordance with the process procedures and operation instructions can the heat treatment quality of bearing ring parts be ensured;

6 Standardize, standardize and simplify the complex heat treatment technology. The prepared process procedures and operation instructions shall be concise and easy to understand, so that the heat treatment operator can understand how to do the work and how to do it well.

Clean and orderly heat treatment environment is also important to improve the heat treatment quality of bearing parts:

1 The order, cleaning, placement, classification and hygiene of the heat treatment production site, which are seemingly trivial and superficial, reflect people's quality, and at the same time, they affect people's work and life quality everywhere, including work efficiency, product quality and even their feelings and health;

2 Implement 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 carelessness and develop a serious work attitude, so as to achieve the purpose of improving the quality of people and the overall work quality;

3 Organize, rectify, sweep, clean, maintain good quality and safety, and become a habit.

 Conclusion:

1. Improve the quality awareness and operation skills of heat treatment operators, who shall work with certificates;

2 Formulate quality control documents, process procedures and operation instructions for heat treatment, regularly inspect and test the existing heat treatment equipment, various bath solutions and testing instruments, and ensure that the temperature in the effective area of furnace temperature heating is uniform and the heating time, bath solution and testing instruments are accurate;

3. Purchase the best bearing materials made in China at fixed points, and strengthen the communication, cooperation and monitoring of upstream suppliers;

4. Operate in strict accordance with the "Four Determinations" of heat treatment quality assurance;

5 Heat treatment production site shall implement 6S management;

6 In short, there are many ways to improve the heat treatment quality of bearing ring parts, which is a complex system engineering. At present, according to the specific situation of the company, centering on the law of "quality, cost, cycle=golden triangle of process improvement", we should focus on the process quality control of heat treatment from the five aspects of "people, machine, material, method and ring" in terms of reducing the deformation of bearing ring parts and improving the service life. Among them, it is very important for operators to work with certificates, regularly check and test furnace temperature, bath solution and detection instruments to ensure accurate and even furnace temperature, accurate heating time, qualified bath solution and accurate detection instruments in the heat treatment process.