Check bearing vibration, bearing failures is very sensitive, peeling, indentation cracks, wear, corrosion, and so reflected in bearing vibration measurement, so by using a special measuring bearing vibration (frequency Analyzer and other) measures the size of vibration, through frequency not infer exceptions to the specific situation. However measured values of each machine for bearing condition of use or sensor installation location is different and therefore require prior to each machine after the analysis and comparison of measurement values determine the criteria.
1, characteristics and formation conditions of vertical cracks-cracks often occur in parts, raw materials, Ribbon and tissue segregation in serious or not to include a vertical extension of, from the surface to crack, crack depth, long the hardenability.
Solution and prevention measures: Elimination of Ribbon and tissue, not more impurities in the raw materials of segregation, rational development of heat treatment parameters, as far as possible factors in the person's actions.
2, characteristics and formation condition of quenching crack of crack-: does not often happen in carburizing quenching parts or components, cracks in parts and gap thickness in the forefront.
Solutions and preventive measures: the key is to develop a proper heat treatment process parameters in order to improve the skills of operators, attempts to eliminate the human factor design best used for arc transition, avoiding sharp corners.
3 network of cracks (also called crack)-forming characteristics and condition of quenching crack: is very easily cause the grinding crack on the surface. Parts with high hardness, chemical treatment, high-frequency hardening tend to have this crack, cracks in the surface, depth of about 0.005-0.02 mm.
Solution and prevention measures: tempering heat treatment insufficient grinding of feed amount is smaller, reducing the heat generated when grinding.
4, strip-characteristics and forming conditions of crack: often seen in surface hardening heat treatment or chemical composition. Split transition area.
Solution and prevention measures: immediately after hardening tempering; a reasonable choice of parameters and the quenching medium.
5, micro-cracks-cracks in this cause is more complicated.
Characteristics and forming conditions of crack, often in high carbon steel, needles of martensite, austenite grain boundaries and crystal defects in memory of the organization.
Solutions and preventive measures, to ensure the chemical composition and structure of the material in the normal state; heat treatment process parameters must be strictly controlled to continuously upgrade their skills to compensate for some unforeseen factors, avoid the occurrence of cracks.
Bearing temperature of bearing outside of room temperature can be speculated that, because this is relatively simple, if you use oil hole can directly measure the bearing outer ring temperature, is more appropriate. Typically, bearing the temperatures slowly rise as the operation began, 1-2 hours to stabilize. Normal temperature of the bearing due to the heat capacity of the machine, heat, speed and load another. If lubricated, install suitable, the bearing temperature is rising quick, unusual high temperatures, in which case you must stop and take the necessary precautions. According to a large number of test data, because the temperature is lubrication, speed, load, environmental impact, so it should be using heat sensors can monitor bearing temperatures at any time, and alarm or stop automatically when the temperature exceeds the specified value prevents burning shaft accident.


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