Precautions for running bearing inspection

Core Tip: It is increasingly important to check the status of the running machine and pre-complete the entire inspection plan. Among them, the bearing is the focus of attention, because it is the most important rotating zero of all the turning machines.
It is increasingly important to check the condition of the running transfer and to have a thorough inspection plan in advance. Among them, the bearing is the focus of attention, because it is the most important rotating part of all the turning, condition monitoring is an important part of preventive maintenance. Bearing damage was detected early to avoid unplanned equipment downtime due to bearing damage.

Especially in important machines or in harsh environments, bearings should be inspected frequently. There are quite a few systems and instruments on the market to monitor bearings. Most of these instruments are based on vibration measurements.

However, not all instruments are equipped with these advanced instruments. In this case, the operator or maintenance engineer of the transfer must be highly alert to the "fault signal" of the bearing, such as noise, temperature and vibration. “Listening,” “touching,” and “observing” are three important methods. The following comments can be used as a reference.

1. Listening

Using auditory to identify irregular movements is a very common approach. For example, the use of an electronic stethoscope or a mechanical listening needle to detect abnormal noise of a part is often a method used by experienced workers. If the bearing is in good operating condition, it will make a low hum. If it is a sharp hum, arpeggio and other irregular sounds, it usually indicates that the bearing is in poor working condition.

Sharp humming noise can be caused by improper lubrication, and improper bearing clearance can cause metallic sound. The indentations on the outer ring of the bearing cause vibration and result in a smooth and crisp sound. If the knocking flaw caused by the installation also produces noise, the noise will vary with the speed of the bearing. If there is intermittent noise, it means that the rolling parts may be damaged. This sound occurs when the damaged surface is crushed. If there are pollutants in the bearing, it will often cause a noise. Severe bearing damage can result in irregular and large noise.

Bearing damage can be detected by hearing, but usually it has reached the stage where the bearing must be replaced immediately. Therefore, a better method is to use an electronic condition monitoring instrument to pre-diagnose the operation of the bearing.

Compared to the old method (using a wooden stick or screwdriver to the bearing housing and the other end to the ear), advanced equipment can be used to accurately predict the bearing condition.

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Causes and solutions for rolling bearing heating

Core Tip: The shaft parts of the machine tool, especially the main shaft, are generally assembled with rolling or plain bearings and rotate at very high speeds, sometimes producing high heat. This kind of present
The shaft parts of the machine tool, especially the main shaft, are generally assembled with rolling or plain bearings and rotate at a high speed, sometimes generating high heat. If this phenomenon is not eliminated in time, it will cause the bearing to overheat and cause the temperature of the corresponding part of the machine tool to rise and cause thermal deformation. In severe cases, the spindle and the tailstock will not be equal, which will not only affect the precision and machining accuracy of the machine itself, but also Burn the bearing. The causes of the spindle bearing heating and its troubleshooting methods are shown in Table 1.

Causes of rolling bearing heating and its elimination

(1) Reason: Low bearing accuracy Method: Select the bearing with the specified accuracy grade

(2) Reason: The spindle is bent or the hole of the box is not in the same way: repair the spindle or the box

(3) Reason: The belt is too tight: adjust the belt to make the tension appropriate

(4) Reason: Poor lubrication method: Select the lubricating material of the specified grade and clean it properly.

(5) Reason: Low assembly quality Method: Improve assembly quality

(6) Reason: The inner casing of the bearing runs the ring method: replace the bearing and related wear parts

(7) The axial force is too large. Method: cleaning and adjusting the gap of the sealing ring is required to be between 0.2 and 0.3 mm, correcting the balance hole diameter of the impeller and verifying the static balance value.

(8) Bearing damage method: Replace the bearing.

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