INA technical analysis of thin-walled bearing parts in the production process
INA bearings is superior even if the transfer forms will announce whining sound muffled noise percussion injuries also occur, this noise will follow the thin wall bearing speed bump and differences.
If there are intermittent noise, then thoroughly. If the announced sharp hissing sound, squeaky voice and other irregular sounds, often reveal poor performance bearing in turn connected to the case.
Under heavy load should be selected for the penetration of small high-pressure grease penetration in addition to a small, but also have a higher film strength and extreme pressure performance at work. According to environmental conditions to select grease, calcium grease easily soluble in water, less suitable for drying and moisture environment. INA bearings commonly used calcium-based grease grease grease sodium calcium and sodium base grease lithium base grease aluminum grease and molybdenum disulfide grease. Bearing grease filling quantity to overflowing bearing interior space 1/2-1/3 as appropriate. Should reduce speed to 1/3 of the excess grease will make the temperature increased.
Bearing temperature, generally bearing chamber outside temperature can be inferred that if the use of thin-walled hole can directly measure the bearing outer ring temperature, more suitable position. Typically, INA bearings bearing operating temperature began to rise slowly as 1-2 hours after reaching steady state. Normal temperature of the heat capacity of the bearing, heat capacity, speed and load of the machine to another. If lubrication, install the appropriate department, the bearing temperature will be rapid rise, there will be abnormally high, then you must stop running, take the necessary precautions.
Bearing is a precision mechanical bearing element, INA bearings mounted on the user sincerely hope that the host can not damage the bearings in a predetermined period of use and to maintain its dynamic performance, but the objective fact is sometimes not satisfactory, bearing failure burst accidents will give users significant loss. Through a lot of bearing failure analysis studies have shown that short-lived or premature loss of bearing accuracy, some due to manufacturing defects or improper material, but to a large extent due to not strictly in accordance with the requirements of bearings for installation, maintenance, or bearing selection or improper actual load exceeds the rated load bearing thin wall itself and other causes of non-normal damage to the bearings.
Bearing cracking spalling is due to appear in the role of INA Bearing load cycle, the contact surface is prone to fatigue damage caused, so in order to increase the service life of bearings, bearing steel must have a high contact fatigue strength.
Hardness is an important quality of the bearing quality of contact fatigue strength, wear resistance, elastic limit has a direct impact. The use of thin-walled bearing steel in general to reach a state of hardness HRC61 ~ 65, in order to make contact with the bearing to obtain a higher fatigue strength and wear resistance.
Manufacture of nylon 46 cage, reducing the ball and keep the sliding friction between the rack. Also, the rotational direction to eliminate the uneven shape, thereby reducing the agitation loss. Further, the shape of the stress can be used to slow the time of assembly to ensure the performance of the assembly. The loss of a single cage 30 to reduce the torque of 40%, the overall loss of the thin wall bearing torque reduction 50 to 65%. The company speculated that the Prius will be 10 models and 15 mode fuel efficiency from the previous 35.5km / L increased to 38.0km / L, improved fuel efficiency of about 1 to 2% is obtained through the use of such bearings.
INA bearing parts in the production process, to go through a lot of cold, hot working process, in order to meet the high-volume, high efficiency, high quality requirements, thin wall bearing steel should have good processing performance. For example, hot and cold formability, machinability, hardenability and so on.