The invalidation of vibration and temperature on the straight and NTN bearing

In use process, NTN bearing vibration and temperature on the influence of the linear bearing is very big, let's look at some of the bearing vibration on the influence of the bearing. Vibration of the bearing damage is quite sensitive, peeling, indentation, rust, crack and wear will be reflected in the NTN bearing vibration measuring. So, through the use of special linear bearing vibration measuring device ( Frequency analyzer, etc. ) Can measure the size of the vibration, through frequency points cannot deduce the abnormal situation. Measured values of bearing or sensor installation position and different using conditions, thus requiring prior to each machine is analyzed by the measured value of the determined after judgment standard. In a FAG bearing grinding, grinding wheel and workpiece contact zone, consuming a small amount of energy, a small amount of grinding heat, forming part of the brake at low temperature in grinding. Application of linear stationary heat source heat transfer practice formula derivation, calculation, or red paint and thermocouple method measured experimental conditions of the brake temperature, can be invented in 0. 1 to 0. When grinding the brake temperature within 001 ms can be as high as 1000 ~ 1500 ℃. The brake at low temperature, enough to make sure depth task looks outside surface of low temperature oxidation, amorphous group and low temperature tempering, secondary hardening, and even burn cracking and other changes. ( 1) Appearance brake when low temperature oxide layer under the action of steel appearance and oxygen in the air, rises into extremely thin ( 20～30nm） The iron oxide thin layer. Notable is oxide layer thickness and appearance of grinding metamorphosis is the total thickness test results of corresponding relation. It explain the indirect coherent oxide layer thickness and grinding process, is an important mark of grinding quality. ( 2) Amorphous organization layer when the grinding zone, brake parts appearance to molten state at low temperature, molten metal molecular flow is evenly coated in task appearance, and the matrix metal cooling at breakneck speed, formed a very thin layer of amorphous tissue layers. It has high hardness and toughness, but it's only about 10 nm, very easily be removed in the fine grinding process. ( 3) Low temperature tempering layer when the grinding zone, brake temperature can make the appearance depth (certainly 10 ~ 100海里) Be heated to a temperature higher than the workpiece temperature tempering heat. In did not reach the austenitizing temperature conditions, with the progress of heated temperature, its appearance will be step by step and heating temperature should be absolutely to the organizational change, or cryogenic tempering tempering hardness also fall subsequently. The higher the heating temperature and hardness of the land is also increasingly fierce. With high temperature often said NTN bearing is in abnormal situation. High temperature is also harmful to linear bearing lubricant. Sometimes overheated bearings can be classified to the bearing lubricant. If the bearing temperature for a long time even the transfer of more than 125 ℃ lower bearing life. The causes of high temperature bearing include: lubrication inadequate or excessive lubrication, the lubricant. Contains impurities, heavy load, bearing damage, clearance, high friction and oil seal and so on. So the continuous monitoring NTN bearing temperature is necessary, whether measured linear bearing itself or other important parts. If it is on the basis of the operating conditions, the temperature change of any fault has occurred. NTN bearing temperature measured on a regular basis can use thermometer, digital thermometer, for example, can accurate bearing temperature measurement and display by ℃ or Fahrenheit units. The importance of the linear bearing, means that when the damage cause of equipment downtime, so this type of bearings shall be equipped with best temperature probe.