There exists some dispersion in the operating reliability and life of angular contact ball bearing, even in good working condition. For critical equipment, especially in the harsh conditions, whether the angular contact ball bearings it equipped with is reliable or not, and whether it can continue to run long or not, become particularly issues concerned about the use of sector. At the same time,it is often directly related to obvious economic benefits, or a very serious accident loss. Therefore, the related department attaches great importance to the technology development of the use of diagnostic techniques. Through scanning parts of the fracture at high magnification electron microscope, the following characteristics are found: 1magnification observation shows that there were many fan-shaped pattern of micro-topography. 2arc is in the front of fatigue crack and there is a lot of corrosion pits. 3observeing by different angles, the morphologies of fan pattern are different. Fan pattern is formed by connecting a different plane crack. Crack was observed at high magnification area and the typical fatigue cracks were found; right crack at low magnification scanning source can be found around the crack pattern beaches source region which has a large crack corrosion pits source. A number of corrosion pits co 4 the point of withstanding the highest stress, is contact point of water jacket and cylinder heat tendon. The B is at less stress. TIMKEN bearings mainly receive three kinds of stress such as water jacket blasting work stress, assembly and thermal stresses. Water jacket maximum stress is hoop stress, and its value is about 128MPa which may occur oil angular contact ball ignition. Artifacts which appear abnormal defective ignition burns often seriously affect the workpiece surface quality and product performance, and even cause the workpiece scrapped. It is especially important for precision workpiece or workpiece surface which has particularly high requirements of quality. 5 observation found in the production, the induction heating, the workpiece and the occurrence of ignition sensors often is not the slightest touch. And angular contact ball bearings are very sensitive to the noise generated. So in order to keep the angular contact ball bearings running smoothly, generallly the high reliability of sintered bronze oil TIMKEN bearings can be adopted. Besides some measures also need to be taken, such as proper control of sintering conditions, making the organization of the alloy is a single phase, and taking anti-corrosion technology measures; another way is to place the workpiece outer stress, serving to offset the water jacket to withstand the tensile stress.
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Angular, contact, ball, bearing,
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