Bearing processing technology

Deep groove sealed ball bearings in China and the foreign advanced products internal structure parameters are almost the same, but the vibration and noise level of our country this kind of product is far with foreign products, the main reason is that in the manufacturing and working condition of factors. From the Angle of bearing industry, condition factors can put forward reasonable requirements of the host to solve, and how to reduce the vibration caused by manufacture factors and noise are bearing industry must solve the problem. At home and abroad a large number of experiments show that keep the frame, ring, steel ball processing quality of bearing vibration with different degree of influence, one of the steel ball processing quality had evident effects on bearing vibration, the second is the ring of the processing quality, is the most important factors affecting the steel ball and ring roundness, surface roughness and surface waviness and knocked wounded, etc. Steel ball products in China's most prominent problem is discrete vibration value is big, serious surface defect ( Single point, the group of points, pits, etc. ) , although the surface roughness, size, shape, error is not lower than outside, but after close set of bearing vibration value is high, and even produce different sound, the main problem is a striation no control ( Top, without proper test and analysis instrument) , at the same time that machine tool vibration resistance is poor, grinding wheel, grinding disc, cooling liquid, the process parameters all problems; On the other hand to improve the level of management, avoid knock against injury, scratches, burns over time such as the quality problem. For ring, affect the bearing vibration is the most severe channel on the surface roughness and waviness. For example, small and medium-sized deep groove ball bearings, both inside and outside channel roundness is greater than 2 microns, will significantly influence on bearing vibration, both inside and outside channel waviness is greater than zero. 7 microns, the bearing vibration value increase with the increase of waviness, rising vibration of the cutting channel serious injury can make more than 4 db, appear even different sounds. Steel ball and ring, waviness produced in grinding, ultra lapping although can improve the waviness and lower roughness, but the most fundamental measures is to reduce the waviness in the grinding process of superfinishing, avoid randomness knocked wounded, measures mainly has two aspects: one is to reduce the vibration of the rolling surface grinding superfinishing, and obtain a good surface processing precision and surface shape grain quality in order to reduce vibration, super grinding machine tools must have good vibration resistance, lathe bed and other important structures with vibration absorption, superfinishing machine oil stone oscillation system has good vibration resistance; Raising the speed of the grinding, grinding abroad 6202 outer raceway generally used 60000 motorized spindle, grinding speed of 60 m/s above, domestic generally much lower, mainly restricted by main shaft and main bearing performance. Small when high speed grinding, grinding force, grinding metamorphic layer thin, is not easy to burn, and can improve the machining accuracy and efficiency, a great influence on low noise bearings; The spindle static stiffness and speed characteristic of low noise ball bearing grinding vibration influence is very big, the higher the stiffness, the less sensitive to the change of grinding force in grinding speed and grinding system vibration is smaller; To improve the spindle bearing stiffness, the random dynamic balance technology, improve the grinding spindle vibration resistance. Foreign grinding head vibration velocity ( Such as Gamfior) About one over ten of the domestic general spindle; Improve the quality of grinding wheel abrasive cutting performance and dressing is very important. Grinding wheel sharpening stone in our country at present the main problem is the difference in organizational structure uniformity, serious