Machine spindle and bearing what are the characteristics. In these years, the function of the spindle of the machine tool is further carried out toward high speed, high precision and high rigidity. Satisfied with these needs, but also must be conducive to environmental protection and pay attention to environmental issues such as global warming.

Extraordinary planning, Mr. Luo: Jintai bearing self-lubricating plain bearing planning conflict science as the base, relying on the four base camp conflict science skills (analytical skills, assessment skills, smooth skills and data skills). This is especially true with the planning of machine tool spindle bearings, first and foremost, Jintai uses its skills to develop long-life, high-performance bearing information. Secondly, on the planning of roll body, we have developed ceramic materials with excellent performance in all aspects under high-speed and ultra-high-speed environment, effectively completed the ultra-high speed and ultra-high precision rotation demand that the metal roll body can not reach, Won the majority of users of praise. Do not special hydraulic bearings, Jintai developed a common configuration of the shape of the roll body bimetallic bushing-guided resin cage, with a short grease smooth running time, stable temperature rise, low conflict low noise, especially in the fat smooth Of the conditions to show better results, but with the fine cylindrical roller bearings, is ultra-high-performance PPS and PEEK resin information, has more superior speed and heat resistance.
Mr. Luo: Spindle bearings radial runout, face beating, rolling body diameter is inconsistent shape error will seriously affect the accuracy of the spindle system and its processing parts, and therefore for precision machine tool spindle bearing precision P5 and above, As for the CNC machine tools, machining bases and other high-speed, high-precision machine tool spindle support, you need to use P4 and above super-fine bearings.

The high speed spindle bearing is also extremely important, especially for the continuous improvement of processing speed demand, including the development of high-speed spindle and electrical spindle continuous improvement, the demand for high-speed spindle bearing is getting higher and higher. If the bearing high speed is not good, the temperature rise of the spindle system will be very serious, and even burn failure.

Mr. Zou: As a crucial foundation, the machine tool spindle bearing is the pillars to ensure the precision of machining. With modern machine tools to the high-precision, high-speed, high reliability direction, the spindle bearings put forward higher requirements. For example, in conventional machinery or ordinary machinery, the rotational speed mainly ranges from several hundreds to several thousands of revolutions per minute. However, in modern high-speed machining machines, the spindle speed needs to reach tens of thousands of revolutions per minute. In the bearing industry, the dmN value indicates a high-speed function, which is the product of diameter and speed. The target of a machine tool spindle is usually within 2 million and the highest is 4 million. The demand is very high. Therefore, the demand of the bearing planning is put forward. Taking the angular ball bearing as an example, the demand of the spindle is analyzed from the aspects of data selection, construction planning, guidance method, smooth method planning and groove curvature coefficient selection, Discussion.

Regarding data discussion, Mr. Zou: Due to the high precision, high speed and high reliability requirements of machine tool spindle bearings, there are some special requirements on the materials. The ferrule materials are mostly made of excellent refined steel and the foreign special special steel. Cage information is copper, plastic, dedicated self-smooth data. Rolling body with bearing steel, ceramic materials.

As a kind of information, ceramic materials in rolling bearings pioneered the world of bearing information. Ceramic materials break through the many limitations of traditional steel bearings, such as high speed, wear resistance, insulation, temperature resistance. Commonly used silicon nitride ceramic proportion is only steel more than 1/3, so at high speed caused by the rolling body of the ferrule greatly reduced, with the standard bearing speed limit substantially improved; silicon nitride ceramic hardness of 1500HV, is Double the bearing steel, high temperature up to 1200 ℃ is 6 times the bearing steel, which undoubtedly expanded the use of traditional steel bearings. Thus, it can be said that the ceramic material is an innovation of tumbling bearing information, and the ceramic material bearing is the most promising bearing for the 21st century. Mr. Chen Shuiwei: There is no special requirement for the information of the usual machine tool spindle and spindle bearing.

However, with the main axis of CNC machine tools to carry out high-speed, spindle bearings operating speed needs are getting higher and higher, and its data needs are getting higher and higher. Currently, ceramic materials (mainly Si3N4 engineering ceramics) have become the production of high-speed precision bearings aspiration. Compared with the bearing steel, ceramic materials have the following advantages: 1) low density. Bearings can be completed lightweight and speed. 2) high rigidity. After the elastic deformation of small, high relative stiffness of the load, the stiffness may be about 15% to 20%, and then reduce the machine vibration. 3) small thermal expansion coefficient. Ceramic bearings vary little in size with temperature and have a lower thermal preload and then avoid excessive heat buildup into exhausted fatigue failure. 4) The conflict coefficient is small. Heat generated during operation is small, greatly reducing the force of the material and the lubricant in the hybrid bearing.

Ceramic bearings have been more and more widely, but due to the difficult processing of ceramic materials, fine ceramic bearings are mostly rolling body is ceramic, inner and outer rings are still made of bearing steel hybrid ceramic ball bearings. Mr. Luo: With the main axis of CNC machine tools to carry out high-speed, the spindle bearings made of high-speed, high stiffness, low temperature rise, long-life needs. The ceramic material (mainly Si3N4 engineering ceramics) due to its low density, high modulus of elasticity, thermal expansion coefficient, wear resistance, high temperature resistance, corrosion resistance and other outstanding features, and then become the production of high-speed precision bearings ambition.