Causes and cleaning methods of oil temperature due to excessive INA bearing temperature

INA bearings are often used, oil can reduce the service life of bearings, then how do we remove the oil on the INA bearings? The following teaches you how to easily remove the oil stain on the INA bearing.

Bearings hardened by soft dry oil or rust-proof paste should be immersed in hot oil of 100 ° C ~ 200 ° C, clamp the bearing with pliers, and brush the oil on the bearing with a brush. The soft dry oil or anti-rust paste is melted when heated to 100 ° C ~ 200 ° C, and is easily washed out from the gap of the bearing. Sometimes the bearing is shaken several times in the oil. Oil will also flow away from the gap.

When cleaning the radial spherical bearing of the INA bearing, the ball, the bead frame and the inner ring should be laterally turned out from the outer ring and then immersed in the hot oil. When the short cylindrical roller bearing is cleaned, the roller and the bead frame should also be cleaned. The inner ring and the outer ring are disengaged.

When hot oil is cleaned, the temperature of the oil should not exceed 20 °C.

The temperature of the INA bearing is generally estimated by the temperature outside the bearing. If the oil hole can directly measure the temperature of the outer ring of the INA bearing, it is more suitable.

Usually, the temperature of the INA bearing rises slowly as the bearing starts to run, and reaches a steady state after 1-2 hours. The normal temperature of the bearing varies with the heat capacity, heat dissipation, speed and load of the machine. If the lubrication and installation parts are suitable, the bearing temperature will rise sharply and abnormal temperature will occur. At this time, it is necessary to stop the operation and take necessary precautions.

The thermal sensor can be used to monitor the operating temperature of the INA bearing at any time, and automatically alarm or stop the occurrence of a burning shaft accident when the temperature exceeds the specified value.

The high temperature often indicates that the INA bearing is in an abnormal condition. High temperatures are also harmful to the lubricant of the bearing. Sometimes bearing overheating can be attributed to the lubricant of the bearing. Long-term continuous rotation of INA bearings at temperatures above 125 °C will reduce bearing life. Causes of high temperature INA bearings include: insufficient lubrication or excessive lubrication, lubricants. Contains impurities, excessive load, bearing damage, insufficient clearance, and high friction caused by oil seals.

Therefore, it is necessary to continuously monitor the INA bearing temperature. The INA bearing measures the bearing itself or other important parts. If the operating conditions are the same, any temperature change can indicate that a fault has occurred.

The INA bearing temperature can be measured periodically by means of a thermometer, such as a digital thermometer, which accurately measures the bearing temperature and displays it in °C or Fahrenheit. The importance of the bearing means that when it is damaged, it will cause the equipment to stop. Therefore, it is better to install a temperature detector for this type of bearing. Under normal conditions, the INA bearing will naturally rise in temperature after lubrication or relubrication for one to two days.

Generally, a bearing that is used at a working temperature of 150° or more is called a high-temperature bearing. Since the chrome-bearing steel is used at a temperature exceeding 150°, the hardness thereof is drastically lowered and the size is unstable, so that the bearing cannot operate normally. Therefore, for INA bearings operating at 150° to 350°, if the ferrule and rolling element are still made of ordinary high carbon chromium bearing steel, special tempering treatment must be applied to the INA bearing parts, which should generally be higher than Tempering is carried out at a working temperature of 50 °. The bearing steel that has been tempered according to the above requirements can be used normally at the working temperature. However, due to the decrease in hardness after tempering, the life of INA bearings has decreased.

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Maintenance and repair of NSK bearings and damage measures

At the time of inspection, it is mainly correct to observe whether the rivet head of the bearing is skewed or loosely welded. The welding of the cage is good or bad. Whether the solder joint is too small, there is a problem that the solder is not strong, or the ball is caused by excessive soldering. They are all special places to pay attention to when testing NSK bearings. There are still some issues to be aware of.

Let's share with you the test of the local part of the bearing in years of work experience. First of all, the inspection of the NSK bearing in the environment should be carried out in a light environment, preferably astigmatism, in order to better observe the outside of the NSK bearing and see that there are no cracks and other abnormalities on the surface. For example, wear, scratches and bumps in the mechanical cloud process can cause the NSK bearing device to shift, resulting in poor position of the device, causing flat load and stress concentration, and reducing the accuracy and service life of the molded NSK bearing.

1. Maintenance, overhaul, and abnormal handling of NSK bearings

In order to maintain the original performance of the bearing in a good condition for as long as possible, it is necessary to maintain, repair, and prevent accidents, ensure the reliability of operation, and improve productivity and economy. Maintenance is best carried out on a regular basis in accordance with the operating standards for the mechanical operating conditions. The contents include monitoring of operating conditions, replenishment or replacement of lubricants, and inspections for periodic disassembly.

As a maintenance item during operation, there are bearing rotation sound, vibration, temperature, lubricant state, and the like.

2. Damage and countermeasures of NSK bearing

In general, if the bearing is used correctly, it can be used until the fatigue life is reached. However, there will be accidents that are prematurely damaged and are not resistant to use. This early damage, as opposed to fatigue life, limits the quality of what is known as a fault or accident. Many of them are caused by inadvertent installation, use, and lubrication, and foreign objects intruding from the outside are insufficiently studied for the thermal effects of the shaft and the outer casing.

Regarding the damage state of the NSK bearing, for example, the jam of the ferrule of the roller bearing, as a cause, the lubricant is insufficient, unsuitable, the defect of the oil supply structure, the foreign matter intrusion, the bearing installation error, the shaft deflection If the song is too big, there will be coincidences of these reasons.

Therefore, it is difficult to know the true cause of the damage by only investigating NSK bearing damage. However, if you know the mechanical use of the bearing, the conditions of use, the structure around the bearing, and the situation before and after the accident, combined with the damage state of the bearing and several reasons, it can prevent similar accidents from happening again.

The precautions for the use of NSK bearings are as follows:

Keep NSK bearings and their turnaround clean

Even small dust that is invisible to the eyes can have a bad effect on NSK bearings. Therefore, keep the area clean so that the dust does not intrude into the NSK bearing.

Use with care

In the use of NSK bearing strong impact, it will produce scars and indentations, which is the cause of the accident. In severe cases, cracks and breaks occur, so care must be taken.

Use the right NSK operating tool

Avoid replacing with existing work bearings and use the right tools. We often emphasize the importance of tools because too many customers use the wrong tools in their installations to cause damage to NSK bearings.

Pay attention to the corrosion of NSK bearings

When operating NSK bearings, the sweat on your hands can cause rust. Be careful to use a clean hand, it is best to wear gloves as much as possible.

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