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Machine tool shaft parts, especially the main shaft, generally and thrust ball bearing assemble into an organic whole, and rotate at high speed, can sometimes produce high heat. If not promptly eliminate, this phenomenon will cause the angular contact ball bearing overheating, and makes the corresponding parts temperature rise and thermal deformation will occur, serious when they make the main shaft and tail frame range is high, which not only affect the accuracy and machining accuracy of machine tool itself, but also the bearing burn out.
Rated fatigue life, it is to point to a set of the same type of bearing, operating in the same conditions, 90% of the angular contact ball bearing is not appear fatigue spalling caused by the total number of turns. In at constant speed, multi-purpose total run time rated fatigue life.
Thrust ball bearing life in research, not only consider the fatigue life, but also according to the performance of the bearing should have taken a few use limit to. For example, the grease lubrication grease bearing life. Life and wear life, noise, according to different purposes, using different limit benchmark, it is mostly chosen in advance experience.
Therefore, investigation of angular contact ball bearing damage, only the real cause of the damage is hard to come by. But, if you know the used machinery, working conditions of the thrust ball bearing, bearing the surrounding structure, to understand before and after the accident, combined with several damage status and causes of bearing, can prevent the similar accident happen again.
Angular contact ball bearing is available, mainly considering bearing damage degree, mechanical properties, importance, and operating conditions, to the next overhaul period. If there are the following defects can't use, must replace the new thrust ball bearing. Inner ring and outer ring, rolling element and cage on any one have crack or gap.
The wear failure is one of the common failure modes of all kinds of bearings, according to the wear and tear is usually divided into one of the most common form of abrasive wear and adhesive wear.
1. The oil film resistor diagnosis technology
Features: can use the same criteria for different working conditions. The surface spalling, indentation and crack the diagnosis of abnormal effect is poor.
Application range: applicable to the occasion of the axis of rotation exposed.
2. The vibration diagnosis technology
Features: vibration diagnosis technology widely used; It can realize on-line monitoring; Diagnosis, diagnosis theory has been mature.
Application: apply is especially suitable for angular contact ball bearing in the rotating machinery fault monitoring.
3. The ferrographic diagnosis technology
Features: the machine without disintegration; Low investment and good effect; Can be found early fatigue failure of oil-free bearings; Can do wear mechanism research.
Application range: applicable to oil lubrication of angular contact ball bearing fault diagnosis, with grease lubricated bearings is relatively difficult.
4. Temperature diagnosis technology
Features: simple diagnosis; Assessment of bearing burn effect is better.
Application range: applicable to the machine simple routine diagnosis of bearing.
5. Optical fiber monitoring and diagnosis technology
Features: high optical fiber displacement sensor sensitivity; To extract the signal directly from the oilless bearing surface, to improve the signal-to-noise ratio; Can directly reflect the manufacturing quality of angular contact ball bearing, the degree of surface wear, load, lubrication and clearance.
Application range: applicable to the sensor can be installed on the bearing inside the machine.
6. Acoustic emission diagnosis technology
Features: diagnosis of quick, easy; Can online monitoring.
Application: in recent years the development of new technology, less used in bearing condition monitoring.
Directly take oilless bearing, with the hand to wash hands sweat in full, and again after coated with high quality mineral oils, especially in the rainy season and summer to pay attention to rust. In some special operating conditions, angular contact ball bearing can be obtained more than the life of the traditional computing, especially in the case of light load. The operating conditions of these special is, when the rolling surface (orbit and rolling) is a lubricating oil film effectively separated and the surface of the limit of pollutants may cause damage. In fact, under ideal conditions, the so-called permanent bearing life is possible.
Do not allow the powerful punch, are not allowed to use hammer percussion bearing directly, don't allow through the transfer roller pressure.
Angular contact ball bearing a rotation, inner ring and outer ring raceway surface, with rolling body is rolling contact, thus path to the dark side, do not belong to the abnormal running track attached to the raceway surface, which can be learned that load conditions, so when removing oilless bearing, please keep close attention and observation on the surface of the raceway.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 4T-495A/493 NTN | 76.2 | 136.525 | 29.769 |
| 4T-5760/5735 NTN | 76.2 | 135.733 | 46.1 |