We can say in the process of using NTN Bearing vibration and temperature on the linear bearings is very large, we first look at the bearing vibration on the bearings.

Vibration damage to the bearings can be said is quite sensitive, peeling, creasing, rust, cracks, wear and will be reflected in the NTN Bearing vibration measurements. Therefore, through the use of special linear bearing vibration measurements (frequency analyzer) to measure the size of the vibration frequency points can not infer the exception of the specific situation. The measured values ??due to different conditions of use of the bearing or sensor installation location, determine the criteria for judging prior to the measured value of each machine.

FAG bearings in grinding, the grinding wheel and workpiece contact area, consumption of small amounts of energy, a small amount of grinding heat occurs, forming part of the grinding zone lost low temperature.
 
Application of linear stationary heat source heat transfer practical formula derivation, contemplating or applications of red inside and thermocouple method under the actual experimental conditions the instant the temperature, can be invented in the 0.1 to 0.001ms within the grinding zone instant the temperature up to 1000 ~~ 1500 ℃. This instant the low temperature, enough to make the task of appearance certainly the depth of the outer surface of the low temperature oxide, amorphous organization, tempering and secondary quenching, and even burn cracking and other change.

(1) the appearance of oxide

Shashi steel under low temperatures, appearance and the role of oxygen in the air or into a thin layer of very thin (20 ~ 30nm) of iron oxide. The focus is to test the consequences of the transformation layer thickness of the oxide thickness and the appearance of grinding was correspondence between. This explains the indirect coherent oxide thickness and grinding process, grinding quality mark.

(2) amorphous tissue layer

Instant the low temperature of the grinding zone to reach the melting status of the workpiece appearance of molten metal molecular flow is evenly coated on the exterior of the task, and the base metal to be cooled extremely rapidly, forming a very thin layer of amorphous Structure layer. It has high hardness and toughness, but it is about 10nm, it is easily in the fine grinding was removed.

(3) layer of low-temperature tempering

The instant the low temperature of the grinding zone to make the appearance is certainly depth (10 to 100nm) is heated to above the workpiece tempering heating temperature. Did not reach the austenitizing temperature conditions, with the progress of the heating temperature, its surface layer is absolutely appropriate to return fire or low-temperature tempering of organizational change with heating temperature, the hardness of landing. The higher the heating temperature, the hardness of landing the more ferocious.

High temperature is often said that NTN Bearing in unusual circumstances. The high temperature also harmful to the linear bearing lubricant. Sometimes bearing overheating can be attributed to the lubricant in the bearing. Bearing more than 125 ℃ temperature long-term even transfer to reduce bearing life. Caused by high temperature bearing the reasons include: lack of lubrication or excessive lubrication, lubricants. Containing impurities, the load is too large, bearing loss of the ring, lack of space, and oil seals produce high friction.

Continuous monitoring of NTN Bearing temperature is necessary, whether it is to measure linear bearing itself or other important parts. If you are under the same operating conditions, any temperature change has failed.

NTN Bearing temperature regular measurements by means of a thermometer, such as digital thermometers, accurate measure bearing temperature and in accordance with the given unit of ℃ or Fahrenheit display. The importance of linear bearings, which means that when it is damaged, can cause equipment downtime, so this type of bearing is best installation of temperature detectors.



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