Concerned about surprises Label: Machine spindle bearing selection criteria and bearing oil performance requirements Previous: How 3D printing is applied in the field of machine tool holders Next: Four measures for anti-corrosion of centrifuges
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Selection of standard spindle speed and temperature rise of machine tool spindle bearings With the development of science and technology, the spindle speed of machine tool is getting higher and higher, and the shift range is getting larger and larger. Therefore, the requirements for high-speed running stability of bearings are getting higher and higher. The temperature rise of the machine spindle bearing is an important factor limiting the speed of the bearing. Under normal circumstances, the correct choice of bearing type, tolerance class, configuration, clearance (preload) size, lubricant and lubrication methods can improve the high-speed performance of rolling bearings to a certain extent.
Life and load capacity For a general machine tool, the life of the spindle assembly mainly refers to the service life of the spindle. Therefore, the accuracy of the bearing is required to maintain the performance of the spindle assembly. For heavy-duty or powerful cutting machines, the bearing capacity of the bearing should be considered first.
Stiffness and vibration resistance To ensure the machining quality of the machine tool, the spindle system must have sufficient rigidity, otherwise it will generate large re-emulation errors and even flutter. Vibration resistance refers to the ability to resist forced vibration and self-excited vibration. The vibration resistance of the spindle assembly depends on the stiffness and damping of the spindle and bearing. The use of preloaded rolling bearings can effectively increase the rigidity of the spindle system.
Noise In high-speed grinding machines, the noise of the grinding head bearing is the main component of the noise of the whole machine, and low-noise rolling bearings should be used.
Performance requirements of machine tool spindle bearing oil The machine tool spindle bearing oil is a special lubricant for precision machine tools and similar equipment spindle bearings. It plays an important role in ensuring the working precision and performance of the spindle and prolonging its service life. It is also called bearing oil. . Its main performance requirements include:
Appropriate viscosity and good viscosity-temperature characteristics are used to make the machine tool spindle bearing temperature not too high, so that the machine tool is thermally deformed, affecting the machining accuracy or making the bearing poorly lubricated. The lubrication should be selected according to the spindle bearing structure, the rotational speed and the bearing clearance. The oil is required to have good viscosity-temperature characteristics to prevent the viscosity from changing too much when the spindle operating temperature and the ambient temperature change greatly, thereby affecting the lubricating performance.
Good lubricity is to maintain a uniform oil film between the main shaft and the bearing contact surface, and the oil film is not damaged when the main shaft starts or stops moving to generate an impact load. Maintaining good lubrication performance reduces friction and friction heat and reduces the main shaft. Temperature rise and guarantee of processing accuracy require good lubrication performance.
Good oxidation resistance When the machine tool spindle adopts the circulating lubrication method, the spindle bearing oil is required to be used for a long time without deterioration, so it is required to have good oxidation resistance.
Good rust resistance Because the oil will inevitably mix into the condensed water in the air or the machine coolant during the operation of the spindle lubrication system, the oil is required to have good rust resistance. 
The development of the machine tool industry in heavy industry is extremely rapid, invisibly driving the development of the chain industry. Machine tool spindle bearings are one of the most important components, and the selection criteria must refer to a number of factors. In order to ensure trouble-free application of the bearing, attention to the bearing oil used is essential.