Analysis of common faults of high temperature greases and standard of rational selection of greases

February 14, 2024

Analysis of common faults of high temperature greases and standard of rational selection of greases

Bearing in the operation process often appear the loss of grease, abnormal temperature rise, abnormal noise, vibration, wear and other phenomena, from the lubrication point of view of this phenomenon is analyzed as follows:

Failure 1: loss (at high temperature, the structure of the oil changes, the viscosity and consistency become smaller, the adhesion is poor, and the oil becomes soft)

Fault 2: dry (under high temperature environment, except for the grease of fluorine oil as the Base Oil, the remaining base oil evaporation loss is large)

Fault 3: Bearing wear

Fault 4: the bearing is burned out

Fault 5: No long-term lubrication

The temperature of the friction part is too high, the grease is oxidized and oxidized in contact with the air, resulting in fat loss. The bearing temperature rises too high and is abnormal, which exceeds the temperature resistance of the grease, and the grease becomes thin, leading to the failure of the grease. It is necessary to look for grease with good oxidation resistance and temperature resistance. Select and replace the high temperature bearing grease in line with the working condition can be solved. Grease loss, failure, entry impurities, poor extrusion lubricity, etc., will lead to poor bearing lubrication, abnormal noise, abnormal wear, abnormal temperature rise and other vicious circle, in serious cases will appear bearing sintering situation. On the basis of selecting reasonable high temperature resistance and oxidation resistance, it is also necessary to pay attention to the extreme pressure lubricity of the grease and pay attention to daily maintenance.

In order to avoid such problems, the following summarizes some basic principles and precautions for the selection of high temperature greases

1. Determine the appropriate grease product according to the different role of the grease

a. Anti-friction grease, mainly considering the range of high and low temperature resistance, load, speed, etc

b. Protective grease. Emphasis is placed on the protection and stability of metals and non-metals

c. Sealing grease, considering the contact seal material and medium, according to the compatibility of grease and material (such as: rubber)

2. Precautions for high temperature grease

a. Temperature: The working temperature of the lubrication point is crucial to the choice of grease, so the working temperature of the part is required.

b. Speed: The running speed of the lubricating parts determines the adhesion and use effect of the selected grease

c. Load: Different loads will affect the viscosity and performance of the selected grease

3. Consider environmental conditions comprehensively

(such as: whether it is in contact with water, strong chemical media, harsh conditions, etc.), whether it is extreme pressure, economic and practical. In addition, how to lubricated, cost control, the level of equipment, the first use or previous problems to implement their own circumstances. Both the equipment and the time limit are important for the problem.

4. Choice of provider

Whether it is the first use or oil change, it is best to require suppliers to provide samples for application. If the amount is too large, it is best to contact and communicate with the head of the technical department of the seller to provide the most accurate and economical high temperature synthetic grease recommendation. Suppliers provide information such as formal invoices and qualifications to ensure reliability.

5. Cost control

Under the premise of calculating the comprehensive cost, the oil varieties should be simplified as far as possible by adopting the principle of high generation and low, common in winter and summer, reducing inventory, and avoiding the chance of oil misuse. However, under the special needs of the equipment, the choice of different targeted greases can better maintain the equipment, reduce failures and maintenance, and do not cause greater costs in the later period because of temporary negligence.

6. Oil compatibility

Mainly for equipment oil change, it is best for different oils and fats specific to the supplier. Under normal circumstances, cleaning is no problem. According to statistics, in the lubrication management, poor lubrication will consume at least 50% more resources, lose 25% of the production capacity, at the same time, 50% of the equipment failure problem from the incorrect lubrication that is not selected suitable for the equipment lubrication products.

Author:

Mr. James

E-mail:

sales@cn-lubricantadditive.com

Phone/WhatsApp:

+86 13783582233