Test the effect of KOYO bearing grease deterioration on temperature

     The grease used in KOYO bearings must have an anti-rust effect, and the anti-rust agent is preferably insoluble in water. The grease should have good adhesion and form an oil film on the surface of the steel. The grease will become soft during machining and cause leakage. In normal operation, grease will be trapped inside the bearing by the bearing housing. If the mechanical stability of the grease is not enough, during the operation, the structure of the soap of the grease will mechanically disintegrate, causing the grease to be destroyed, thereby losing the lubricating effect. If the grease is wrongly selected, all the measures for preventing the bearing are futile. It is important that the viscosity of the base oil at the working temperature provides sufficient lubrication. The viscosity is mainly affected by the temperature, it decreases as the temperature rises, and it rises when the temperature drops. Therefore, it is necessary to know the viscosity of the base oil at the operating temperature. Mechanical manufacturers often specify the use of certain greases, however most standard greases are available in a wide range of applications.

      Grease is very critical in the use of KOYO bearings. If a deteriorated grease is used, it will not only function as it should, but it will also damage the bearing.

1 Oil flow observation method

Take two measuring cups, one of which is filled with the lubricating oil to be inspected, the other is placed on the table, and the measuring cup filled with lubricating oil is lifted off the table 30-40 cm and tilted to allow the lubricating oil to slowly flow to the empty cup. In the middle, observe the flow, the quality of the lubricating oil flow should be slender, even, continuous, if the oil flow suddenly and slowly, and sometimes there is a large flow, then the lubricant has deteriorated.

2 manual method

The lubricant is rubbed repeatedly between the thumb and the index finger. The better lubricant feels lubricated, less wear debris, and no friction. If you feel a large friction between the fingers, it means lubricating oil. There are many impurities inside, can not be reused, should be replaced with new lubricants.

3 lighting method

On a clear day, use a screwdriver to pry the lubricant at a 45-degree angle to the horizontal. Observe the sunlight and observe the oil droplets. Under the light, it can be clearly seen that there is no wear debris in the lubricating oil, which can continue to work. If the grinding debris is too much, the lubricating oil should be replaced.

4 oil drop trace method

Take a clean white filter paper, drop a few drops of oil on the filter paper. After the oil leaks, if there is black powder on the surface, touch the hand with a feeling of resistance, it means that there are many impurities in the lubricant, good lubricant No powder, it is dry and smooth by hand, and it has yellow marks.

   The periodic measurement of the bearing temperature can be accurately measured by means of a thermometer, such as a digital thermometer, and can be measured 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 bearing will naturally rise in temperature after lubrication or relubrication and last 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 bearings with working temperature between 150° and 350°, if the ferrule and rolling element are still made of ordinary high carbon chromium bearing steel, the bearing parts must be specially tempered, generally higher than the working temperature. Tempering at 50°. The bearing steel that has been tempered according to the above requirements can be used normally at the working temperature. However, the bearing life has been reduced due to the decrease in hardness after tempering.

    (1) Cleaning and heat treatment Waste water, waste gas, waste salt, dust, noise and electromagnetic radiation formed by heat treatment will cause environmental pollution. To solve the environmental pollution problem of heat treatment, the implementation of clean heat treatment (or green heat treatment) is one of the development directions of heat treatment technology in developed countries. In order to reduce the emissions of SO2, CO, CO2, dust and cinder, coal has been basically eliminated as a fuel, and the use of heavy oil is also becoming less and less. Most of the light oil is used, and natural gas is still the most ideal fuel. The waste heat utilization of the combustion furnace has reached a high level. The optimization of the burner structure and the strict control of the air-fuel ratio ensure that NOX and CO are reduced to a minimum under the premise of reasonable combustion; gas carburizing and carbonitriding are used. And vacuum heat treatment technology instead of salt bath treatment to reduce the pollution of waste water and CN-toxic substances to the water source; water-soluble synthetic quenching oil instead of part of quenching oil, using biodegradable vegetable oil instead of part of mineral oil to reduce oil pollution.

    (2) Precision heat treatment Precision heat treatment has two meanings: on the one hand, according to the use requirements of the parts, materials, structural dimensions, using physical metallurgical knowledge and advanced computer simulation and detection technology to optimize the process parameters to achieve the required performance or Maximize the potential of the material; on the other hand, fully guarantee the stability of the optimized process, achieve a small dispersion of product quality (or zero) and heat treatment distortion to zero.

    (3) Energy-saving heat treatment Scientific production and energy management are the most promising factors for effective energy utilization. It is a scientific management choice to establish a professional heat treatment plant to ensure full-load production and full use of equipment capabilities. In the heat treatment energy structure, priority is given to primary energy; waste heat and waste heat are fully utilized; and processes with low energy consumption and short cycle are used to replace processes with long cycle and high energy consumption.

    (4) Less oxidation-free heat treatment is heated by a protective atmosphere heating instead of an oxidizing atmosphere to control the carbon potential and nitrogen potential in a controlled atmosphere. The properties of the parts after heat treatment are improved, and heat treatment defects such as decarburization and cracking are greatly reduced. The subsequent finishing allowance is reduced, which improves material utilization and machining efficiency. Vacuum heating, gas quenching, vacuum or low pressure carburizing, nitriding, nitrocarburizing and boronizing can significantly improve the quality, reduce distortion and improve life. The quality control of KOYO bearing parts is the most stringent in the entire machinery industry.

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Method of maintenance and overhaul of TIMKEN bearings

Bearing maintenance
In order to maintain the original performance of the TIMKEN 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 content includes monitoring of operating conditions, replenishment or replacement of lubricants, and periodic disassembly inspections. As a maintenance item during operation, there are bearing rotation sound, vibration, temperature, lubricant state, and the like.
Bearing overhaul
Cleaning of the bearing: When disassembling the TIMKEN bearing, first record the appearance of the bearing, confirm the residual amount of the lubricant, and then wash the bearing after sampling the lubricant for inspection. As a cleaning agent, gasoline and kerosene are commonly used. The cleaning of the removed bearings is divided into coarse cleaning and fine cleaning. They are placed in the container respectively, and the metal mesh bottom is placed first so that the bearing does not directly contact the container. In rough cleaning, if the bearing is rotated with dirt, it will damage the rolling surface of the bearing and should be noted. In the rough cleaning oil, use a brush to remove the grease and the adhesive. After it is almost clean, it is transferred to the fine wash. Fine washing is to carefully clean the bearing while rotating it in the cleaning oil. In addition, the cleaning oil should always be kept clean.
Inspection and judgment of TIMKEN bearings: In order to judge whether the removed bearings can be used, check the bearings after cleaning. Check the raceway surface, the rolling surface, the state of the mating surface, the wear of the cage, the increase of the bearing clearance, and the damage and abnormality that are irrelevant in dimensional accuracy. For non-separable miniature ball bearings, use one hand to support the inner ring horizontally and rotate the outer ring to check if it is smooth. Separate bearings such as tapered roller bearings can be inspected separately for the rolling surfaces of the rolling elements and the outer ring. Large bearings cannot be rotated by hand. Pay attention to the appearance of rolling elements, raceways, cages, and ribs. The higher the importance of bearings, the more careful inspection is required.
Lubricating oil: TIMKEN bearing high-performance grease protects the bearing and removes dirt and foreign matter inside the Palin.
Once the bearing has been dismantled, it will become easier to enter the sand than the original, the sand will stick to the lubricating oil, and it will be washed more often, so it is better not to wash it.
1. Remove the wheels first.
2. Remove the bearing. If the bearing is very tightly operated over a long period of time, use a hexagonal wrench to dig it down. Rest assured, the bearing is not easy to break!
3. Brush the dirty surface of the Palin with a toothbrush. Some bearings have detachable side covers, while others do not. First determine if you are detachable.
(Note) If there is a C-shaped ring at the edge of the bearing side cover, it is detachable, no, it is not removable, but there are exceptions!
4. If it is detachable, use a precision screwdriver with a word to pick up the C ring along the gap and then remove the side cover.
5. If it is unremovable, it is relatively troublesome. To use a precision screwdriver to extend into the side cover seam, force the side cover to pick up, just remove the side just fine, the two sides will be destroyed!
6. Remove all the side covers of the TIMKEN bearing and start washing. Pour the oil into the ceramic bowl and throw the bearing down and stir it.

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