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Bearing Improve The Quality Of Heat Treatment
Jul 14, 2017

Bearing the operation of the inspection items are bearing the rolling sound, vibration, temperature, lubrication status, the specific situation is as follows:

First, the rolling bearing sound

The use of sound on the bearing in the operation of the rolling sound of the size and sound quality to check, even if the bearing is slightly stripped and other damage, will be issued an abnormal sound and irregular sound, with the sounder to distinguish.

Second, the bearing vibration

Bearing vibration is sensitive to bearing damage, such as peeling, indentation, corrosion, cracks, wear, etc. will be reflected in the bearing vibration measurement, so by using a special bearing vibration measuring device (frequency analyzer, etc.) can measure the vibration The size of the frequency can not be inferred by the exception of the specific circumstances. The measured values are different depending on the conditions of use of the bearings or the location of the sensor installation. Therefore, it is necessary to determine the judgment criteria after analyzing and comparing the measured values of each machine in advance.

Third, the bearing temperature

Bearing the temperature, generally have the bearing room outside the temperature can be speculated, if the use of oil hole can directly measure the bearing outer ring temperature, the more appropriate. Normally, the temperature of the bearing rises slowly as the operation begins, reaching 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, the installation of the appropriate, the bearing temperature will rise rapidly, there will be abnormal high temperature, then must stop running, take the necessary precautions. According to a large number of test data, Table 4-1 lists the average value of the outer ring temperature for bearing operation in various machines for reference. As the temperature is subject to lubrication, speed, load, the impact of the environment, the table only shows the approximate temperature range.

The lubrication method of the bearing is roughly divided into grease lubrication and oil lubrication. In order to give full play to the function of the bearing, it is important to use the lubrication method according to the use of the reduction and the purpose of use. Table 4-2 shows the advantages and disadvantages of grease lubrication and oil lubrication.

For lubricated bearings, there is a fixed concept of prevention, that is, the bearing is not dry and crash and stop running under the conditions to maintain the proper operation of the equipment. But we have to do that must maintain a balance between lubrication and hunger and excessive lubrication. If the oil change too little, the bearings will be scrapped in advance; if the oil change too much, the bearings will be in trouble or long-term damage to power coil and coil.

The bearing is an important mechanical foundation connection, widely used in the mechanical industry. It can be said that there is rotation where there is bearing. Automobile as a modern society people's main means of transport, the automobile industry has become China's main pillar industry, which also plays an important role in the bearing. Many of the car security parts, such as steering gear, engine and gearbox, etc., can see the bearing figure. Automotive bearings as a branch of the bearing, bearing, impact and high-speed rotation and other special properties, its performance on the passengers, drivers and the safety of the vehicle itself has an important impact.

Bearing parts heat treatment quality is an important factor in determining bearing life. At present, the main automobile bearing production enterprises in China can basically guarantee the quality of heat treatment of parts, but the precise control of the parameters of the heat treatment process, the use of quenching medium and the capacity of heat treatment equipment are not enough, so that the quality stability of the heat treatment of bearing parts is Big gap. Foreign advanced enterprises have been widely implemented CQI-9 quality standards in the country is limited to individual enterprises of the selective trial, which also doping to foreign enterprises to review the factors. Therefore, a comprehensive and conscious implementation and promotion of CQI-9 quality standards, should be the domestic bearing manufacturers to improve the quality of heat treatment, to achieve or exceed the advanced level of foreign only way out.