Corrosion, black skin, and pitting, the latter two are defects that are easy to store moisture and dirt, and are most likely to develop into rust.Corrosion is a source of pollution that leads to poor installation, early wear and fatigue. Severe corrosion will make INA bearings scrapped.
The quality of the riveting or welding of the cage, mainly to observe whether the rivet head is misaligned, skewed,slack, lack of meat or "double eyelid", whether the welding position is correct, whether the welding point is too large or too small, whether the welding is not strong or excessive Causes the phenomenon of jamming the rolling body, whether the quality of the pressure slope, edge trimming, caulking and chiseling of certain cages is guaranteed, and whether the rolling bodies can fall out of the cage and can rotate freely. If these points are not satisfactory, the small As a result, the noise and rotation accuracy of the INA bearings are reduced, and the cage may fall apart, causing mechanical failure or accidents.
For the role of relative axial displacement between the fixed shaft and the bearing box, the other side is called the free side, which only bears radial load, and the axial direction can be relatively moved, so as to solve the problem of the shaft due to temperature changes The expansion and contraction problems and the spacing error of installing INA bearings.
For fixed-side INA bearings, you need to select the INA bearings that can use the rolling surface to move in the axial direction (such as cylindrical roller bearings) or move to the assembly surface (such as radial ball INA bearings). On relatively short shafts, when the fixed side is free from the free side, bearings that only move axially in one direction (such as centripetal thrust ball INA bearings) are used.
Install the INA bearing housing on the housing, if there is grease filling hole, it must be aligned with the position.Tighten the INA bearing housing with the tightening bolts coated with anti-loosening glue; tighten the eccentric block tightening bolts, turn the adjustable eccentric block to the angle position before removal and tighten the tightening bolts.After the above assembly is completed, the rotating shaft should have a certain axial series.
The maintenance of bearing disassembly needs to be performed better when it is cleaned. It also records the appearance and confirms the effect of the remaining amount of lubricant. It can be used as a cleaning agent for sampling and inspection. Gasoline and kerosene are generally used. The removed bearing is divided into coarse cleaning and fine cleaning, and placed in the container separately, first put the bottom of the metal mesh pad, so that the INA bearing does not directly contact the dirt of the container.During rough cleaning, if the bearing is rotated with dirt, it will damage the rolling surface of the bearing, so care should be taken.In the coarse cleaning oil, use a brush to remove grease and adhesions. After it is roughly clean, transfer to fine washing.Fine washing is to carefully clean the INA bearings while rotating in the cleaning oil.In addition, the cleaning oil should also be kept clean.
INA bearing cleaning method
There are two methods for cleaning INA bearings:
Soak the INA bearing in kerosene for 5-10 minutes, pinch the inner ring with one hand, and turn the outer ring with the other hand, the dry oil or anti-rust paste on the bearing will fall off.Then put the bearing in cleaner kerosene, wash it with a fine brush, wash the oil stains in the balls and gaps, and then wash it in gasoline once, take it out on clean paper.Radial spherical ball bearings and short cylindrical roller bearings should be cleaned by removing the balls, bead holder, inner ring and outer ring. INA KR40 -PPA bearings online , pls click here :
The cleaning of the INA bearing mounted on the shaft is mainly by the method of spraying oil or spraying with an oil gun. The oil stains that are easily cleaned are first used with kerosene and then gasoline; the oil stains that are difficult to clean are first sprayed with hot engine oil at 100-200 ℃ Wash or spray with an oil gun, and then clean with gasoline.Be careful not to scrape the bearing with sharp tools: hard grease or rust is formed to avoid damaging the smoothness of the bearing rolling elements and groove ring parts. The cleaned bearings are wiped dry with a clean cloth.
2.Hot oil cleaning method
Due to long-term use, bearings that are hardened with soft dry oil or anti-rust paste should be immersed in hot engine oil at 100-200°C, clamp the bearing with pliers, and clean the oil stain on the bearing with a brush.Soft dry oil or anti-rust paste is melted by heating to 100-200℃, and it is easy to wash out from the gap of the bearing.Sometimes as long as the bearing is shaken in the oil multiple times.Grease will also flow away from the gap.
When cleaning the radial spherical bearings of old motors or imported motors, the balls, bead holders and inner rings should be laterally turned out of the outer rings and then immersed in hot oil. The rollers should also be used when cleaning short cylindrical roller bearings , Bead stand, inner ring and outer ring are disengaged.
When cleaning with hot oil, the temperature of the oil should not exceed 20°C.If using an open flame for direct heating, care should be taken to prevent the oil from burning, the bearing should be hung in the oil pan, and the bottom will cause overheating and reduce the hardness.
The motor should be cleaned and refueled after 2000 hours of use.