Impact angular contact ball bearing grinding attention to several important points

Affect the main factor of angular contact ball bearing grinding metamorphic layer has two aspects, respectively is a function of TIMKEN bearing grinding forces and grinding heat. 1, the grinding force in grinding process, the workpiece surface layer will be grinding wheel cutting force, compression force and friction force. And, in particular, the role of the latter two, make the workpiece surface layer formed directional strong plastic deformation and strain hardening layer. The metamorphic layer is bound to affect the surface residual stress changes. ( 1) Cold plastic deformation layer in the process of grinding, every moment of abrasive is equivalent to a cutting edge. But in many cases, the rake Angle of cutting edge negative, in addition to abrasive cutting action, is to make the workpiece surface under compression ( The plough) That left obvious plastic deformation of workpiece surface layer. The deformation layer deformation degree as the degree of grinding wheel dull increases and grinding feed. ( 2) Thermoplastic deformation ( Or high temperature deformation) Layer of grinding heat in the transient temperature of the work surface formation, makes a certain depth of the workpiece surface layer elastic limit fell sharply, even to the point of elastic disappear. The work surface on the grinding force, especially under the action of compression force and friction force, caused by free stretch, subject to the conditions of the matrix metal, the surface is compressed ( More plough) , cause the plastic deformation in the surface layer. High temperature plastic deformation under the condition of the grinding process is constant, with the temperature increasing of workpiece surface. ( 3) Sometimes work hardening layer microhardness and metallographic method can be found that caused by the machining deformation of surface hardness. 2, grinding heat in the grinding, grinding wheel and workpiece contact zone, consume large amounts of energy, produced a large number of grinding heat, local transient high temperature caused by grinding area. On the basis of the theory of linear motion heat source heat transfer formula derivation, calculation or by the method of infrared ray and measured experiment under the condition of instantaneous temperature thermocouple method, can be found in 0. 1 to 0. The grinding area within 001 ms instantaneous temperature up to 1000 ~ 1500 ℃. The instantaneous high temperature, which would have made certain depth on the surface of the work surface to produce high temperature oxidation, amorphous group, high temperature tempering, secondary hardening, and even burn cracking and other changes. Proper material selection is still is angular contact ball bearing failure analysis factors must be considered. The main task of the bearing failure analysis, which is based on a lot of background material, analyze data and failure forms, find out the main factors of bearing failure, so that the improvement measures are put forward, prolonging bearing, avoid premature failure of the bearing of the sudden. Installation condition is one of the primary factor of use factor, bearing is often caused by improper installation and the force states of TIMKEN bearings between various parts of a complete set of changes, angular contact ball bearings in the abnormal state of operation and early failure. According to the bearing installation, use, maintenance, maintenance of technical requirements, the operation of the angular contact ball bearing on the load, speed, temperature, vibration, noise and lubrication condition monitoring and inspection, found that abnormal immediately to find the reason, adjustment, so that it is back to normal. Bearing cleaning: remove the bearing repair, record the appearance of the bearing, for the first time confirmed the amount of residual lubricant, sampling inspection after the use of lubricants, cleaning bearing. As a cleaning agent, general use gasoline, kerosene. Remove the bearing cleaning, washing and fine washing thick, be placed in a container, metal openings at the first, don't make direct contact with the bearing of the dirt of the container. Rough washing, if the bearing rotating dirt, damage the TIMKEN bearing rolling surface, it should be noted. In the crude oil washing, brush with the brush to remove grease, viscous material, generally clean, wash into the fine. Fine wash wash oil is in the side of the bearing rotation, while carefully cleaned. In addition, clean the oil must be kept clean bearing maintenance and judgment: to determine whether can be used to check after cleaning remove bearing angular contact ball bearing. Check the raceway, raceway, surface state, cage wear and bearing clearance and to increase the dimension precision, has not damage, abnormal. Non separation of small ball bearings, inner ring, with one hand support level, rotate the outer ring to confirm smoothly. TIMKEN bearing separation type bearing, rolling your body, outer ring raceway surface examined. Large bearings, because they can't rotate with the hand, pay attention to check the raceway of roller and cage, metope, such as the appearance, the higher the importance of bearing, check more carefully. When the detection of rivet head main observation is there a link between slanting, easing the welding position is not correct. The welding quality. Welding point is too small, do you have any welding or welding, solid ball card caused problems. Angular contact ball bearing test need to pay special attention to the process. There are also some problems needing attention. Here to share with you many years of experience, in the local bearing detection. Iron, Ken bearing on the environment of the first check should be in the light environment, it is the best astigmatism, in order to better TIMKEN bearings, was observed on the surface appearance and no crack and other anomalies. Such as cloud of mechanical wear and scratches, touch pressure in the process of bearing equipment can lead to shift, and result in poor equipment location, lead to the shape of the bearing flat load and stress concentration, reduce precision and service life. In addition to pay special attention to the work environment or the pollutants in the water, which is most likely to lead to bearing rust, rust is lead to bad TIMKEN bearing installation, early wear and tear, will lead to more serious waste is a direct relationship. Therefore, it is important to pay special attention to in water to moisten of course.