General steps for maintaining bearing roll neck bearings

1) Track the position of the bearing in the mill and record it. Timken can provide customers with a roll neck bearing maintenance service record card that can be used to record the housing number, roll number, rack number, bearing position on the mill, outer ring bearing area and rolled product tonnage and bearing working hours Number of data. The record card should be updated at any time and is convenient for maintenance personnel to check. The bearing blanks can record bearing measurement data and other test details.

2) Remove the bearing housing from the roll and remove the bearing from the bearing housing. Whether it is to remove the bearing from the bearing housing or to carry out bearing inspections, special lifting methods and tools are required. Timken can provide customers with lifting tools and special lifting methods.

3) Clean the bearings. All flaking, water, residual lubricant and any other contaminants that cause severe wear on the bearings should be removed during the cleaning of the bearings. The cleaning method and cleaning agent used to clean the bearings are determined according to the size of the bearing to be cleaned or the number of bearings. Small bearings or a small number of bearings can be used with kerosene, mineral oil or other commercial solvents. For large bearings or large numbers of bearings, use a neutral oil with a viscosity of 22 cSt (or 100 SUS at 100 °F) at 40 °C in a cleaning tank.

4) Check the bearings, including visual inspections and minor repairs. On the outer surface of the inner ring or the surface of the roller on which the roller can be removed, if a small peeling or skin crack is found, the metal is usually peeled off by a sander and the edge of the peeling surface is polished.

5) The degree of bearing wear should be checked regularly, and the bearing wear can be evaluated by measuring the bearing clearance;

6) Inspect and repair the bearing housing as needed;

7) Put the bearing back into the bearing housing;

8) Inspect and repair the roll neck as needed;

9) Mount the bearing housing with the bearing onto the roll.

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Analysis: bearing clearance rate and application of the matching instrument

First, we must attach great importance to the importance of improving the bearing clearance rate

One of the main quality indicators for bearing matching is radial clearance. Radial clearance refers to the total clearance of the inner and outer ring channels and the rolling elements in the diameter direction.

Therefore, the bearing clearance is not only a major parameter for the qualification of the finished bearing after the qualified finished parts are matched, but also an important factor for the normal operation of the bearing. The clearance value does not meet the technical standards, which will affect the reasonable distribution of the load between the rolling elements. The rotation accuracy, vibration value and life of the bearing will be affected. Therefore, it is undoubtedly important to improve and guarantee the clearance rate of the bearing.

Second, analyze the causal relationship of the radial pass rate

In the process of product quality, once the problem is discovered, it is necessary to find the cause immediately. Using the form of causal analysis, we will analyze the low rate of radial clearance.

There are five major factors affecting the quality of bearing clearance. If materials and environmental factors are not considered for the time being, the influence of the testing instruments, process methods and personnel quality on the quality of the bearing clearance can be mainly analyzed. In the past, the matching method of the inner and outer rings of the bearing and the steel ball is to connect the inner and outer ring channels. The diameter deviation is sorted by the instrument, and a certain inner ring channel diameter size value and an outer ring channel diameter size value are calculated according to the standard clearance, and then the corresponding size copper ball is selected, and after the assembly, the shaft is assembled. Test the upper and lower limit values ​​of the axial clearance to the clearance checker. If the technical requirements are not met, the three will be re-matched. As for the radial clearance value of the bearing, it is known by the axial clearance value, which is difficult to ensure accuracy. Because the measured axial clearance value is only the upper and lower limit values, and the upper and lower limit values ​​are different due to the curvature of the channel and the method of each person, the radial qualification rate of the bearing selected by this method is adopted. It is unstable. When the time is high and the time is low, the number of rework is frequent, and the quality of the product cannot be confirmed.

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