Extend the maintenance and maintenance of TIMKEN angular contact ball bearings

In order for TIMKEN bearings to be fully utilized and to maintain their proper performance for a long time, regular maintenance (regular inspection) must be performed.

Through proper periodic inspections, early detection of failures and prevention of accidents are important to improve productivity and economy.

1, cleaning

When the angular contact ball bearing is removed for inspection, the appearance record is first recorded by photography. Also, verify the amount of lubricant remaining and sample the lubricant before cleaning the bearings.

a. The cleaning of the bearing is carried out by rough washing and fine washing, and a metal mesh frame can be placed on the bottom of the used container.

b. When rough washing, remove the grease or adhesive with a brush or the like in the oil. At this time, if the TIMKEN bearing is rotated in the oil, be careful that the rolling surface will be damaged by foreign matter or the like.

c. When washing finely, slowly rotate the bearing in the oil and carry out it carefully.

The cleaning agent generally used is a neutral non-aqueous diesel oil or kerosene, and a warm alkali liquid or the like is sometimes used as needed. Regardless of which cleaning agent is used, it is often filtered and kept clean.

Immediately after cleaning, apply anti-rust oil or anti-rust grease to TIMKEN bearings.

2, inspection and judgment

In order to judge whether the removed angular contact ball bearings can be reused, it is important to check the dimensional accuracy, rotation accuracy, internal clearance, mating surfaces, raceway surfaces, cages and seals.

Regarding the inspection result, it can be judged by a person who is using a conventional bearing or a proficient bearing.

The criteria for judgment vary depending on mechanical properties and importance, inspection period, and the like. Bearings must not be reused if they are damaged and must be replaced.

1) Breakage and defects of bearing components.

2) Peeling of the rolling surface of the raceway surface.

After the bearings have been installed, alignment may result in additional loads, friction and vibration of the angular contact ball bearings if not carefully aligned. These can accelerate fatigue and reduce bearing life and can damage the life of other machine parts. In addition, increased vibration and friction can greatly increase energy consumption and risk of premature failure.

3. Basic condition monitoring

During use, the basic external conditions of TIMKEN bearing operation, such as temperature, vibration and noise measurements, are often monitored. These regular inspections will identify potential problems early and will prevent unexpected machine stops, enabling production plans, increased plant productivity and efficiency.https://www.supplyforever.com/

45 steel heat treatment

       Quenching and tempering has a range of hardness, generally between 225-297HB. 45# steel is quenched and tempered, that is, quenching + high temperature tempering, the hardness should be at 297HB, that is, 31 ~ 32HRC! This is the most ideal state. This value may not be reached in general.

       45 steel quenching, if water quenching can generally reach 40----60HRC (according to water temperature and material size), quenching with oil is generally between 30----55HRC (depending on the thickness of the material and the type of quenching oil) ).
       There is no relationship between cracking and cracking and how much hardness is reached during the heat treatment, which is related to the shape of the workpiece and the heat treatment method.

       Medium and low carbon steels generally use normalizing. After the normalizing, the pearlite structure is obtained, which is convenient for cutting. High carbon steel, alloy steel is annealed (normal, spheroidized, isothermal.)

       Quenching and tempering is a double heat treatment of quenching and high temperature tempering, the purpose of which is to make the workpiece have good comprehensive mechanical properties.

       Quenched and tempered steel has two types of carbon quenched and tempered steel and alloy quenched and tempered steel. Whether it is carbon steel or alloy steel, its carbon content control is strict. If the carbon content is too high, the strength of the workpiece after quenching and tempering is high, but the toughness is not enough. If the carbon content is too low, the toughness is increased and the strength is insufficient. In order to obtain good overall performance of the tempering parts, the carbon content is generally controlled at 0.30~0.50%.

       During quenching and quenching, the entire section of the workpiece is required to be hardened, so that the workpiece is obtained by fine-stacked quenched martensite. By tempering at a high temperature, a microstructure mainly composed of uniform tempered sorbite is obtained. It is impossible for a small factory to conduct metallographic analysis for each furnace. Generally, it is only used for hardness testing. That is to say, the hardness after quenching must reach the quenching hardness of the material, and the hardness after tempering is checked according to the requirements of the drawing.
The operation of the workpiece quenching and tempering must be carried out strictly according to the process documentation. We only give some thoughts on how to implement the process during the operation.https://www.supplyforever.com/