Long life INA process requirement of machine tool spindle bearing the attention of some knowledge

User when necessary to INA bearing manufacturing factory, process quality requirements for the extend bearing life, such as stress state and on the surface of the rolling processing metamorphic layer control requirements. Generally speaking, the rolling surface in the moderate compressive stress state is better, but also in combination with surface from grinding to superfinishing stress rate, to determine the most conducive to the process parameters of machine tool spindle bearing fatigue life, in this respect, should be obtained bearing the relevant professional staff to cooperate to solve them. 1. Bearing assembly method because of INA bearings are precision products, such as improper assembly channel, it is easy to damage to the machine tool spindle bearings, bearing damage. In the bearing assembly should have a special mould, can't play when axial pressure force is only a small circle, circle, only according to the stress cycle. Pneumatic or hydraulic assembly requirements, the use of pressure to the mold under the outside installed in a horizontal state, if inclined to bearing channel will lead to the damage caused by the power, and make the bearing produces sound. 2. The removal of bearing and install also carefully. Careful not to damage the INA bearing and various parts, especially interference fit the bearing down, and the operation is difficult. So, in the design stage to consider in advance to facilitate disassembly, designed and manufactured according to need remove the tools is also very important. When disassembling, according to the drawings the disassembly method, sequence, investigate the matching of the machine tool spindle bearing conditions, to ensure foolproof disassembly operations. 3. Imported bearing materials allows foreign hard particles in the lubricant pliers and prevent scratches or ( And) The ability of abrasive wear. For metallic materials with low hardness and elastic modulus, clamp in the sex is good, and the nonmetal material is not necessarily, carbon graphite, for example, low elastic modulus, but the clamp in the sex is bad. Bearing usually use soft material and hard material forming friction, usually made from soft material bearing shell. 4. Check the bearing vibration in the working situation from peeling, indentation, rust, crack and wear will reflect in the INA bearing vibration measurement, machine tool spindle bearing vibration is very sensitive for bearing damage, therefore, by adopting special bearing vibration measuring device ( Frequency analyzer, etc. ) Can measure the size of the vibration, through frequency points cannot deduce the abnormal situation. Metamorphic layer mainly refers to the oxide layer on the surface of the rolling and work hardening layer and distortion on the physical and chemical properties such as other surface layer with the substrate metal, they are often very poor strength and combined with matrix is not firm, fatigue life and wear life of the machine tool spindle bearings are extremely adverse, appropriate control. For high-precision bearings, as required by the rolling surface roughness is small, if inappropriate technological means, the high bright and clean surface is not formed by cutting, of crowded but grits, formed by the surface shall be formed by plastic flow metamorphic layer, actually for machine tool spindle bearing life is very bad, should also be controlled.