The best conditions for repairing and repairing rolling bearings

Core Tip: Rolling bearings are mass-produced mechanical parts, and the manufacturing precision is very strict, and the degree of specialization in technology is very high. Therefore, for most bearing types that are easy to buy,
Rolling bearings are mass-produced mechanical parts, and the manufacturing precision is very strict, and the degree of specialization in technology is very high. Therefore, for most of the easy-to-buy bearing types, it should be more cost-effective to buy than in the following cases. Only consider the bearing repair problem, namely:
(1) A large number of bearings of the same type used in large factories are mainly in the form of wear on the rolling surface, fatigue or fretting abrasion, especially the damaged parts are mostly cages or rolling elements, and the ferrules or gaskets are still repaired. value;
(2) Large and extra large bearings, which have no major damage to the parts due to failure or failure, or valuable bearings must be managed to extend their useful life;
(3) Some types of bearings that are really difficult to purchase, have no spare parts after failure and have to be repaired, especially imported bearings;
(4) The bearing has slight damage, such as slight rust generated during the inventory period, and slight fretting abrasion caused by transportation. It is a pity that such repair is easy and abandon.
In addition to economics, the repair of the bearing is also technical, which requires the repairer to fully understand the corresponding technical requirements of the bearing, and the structural, technical and material characteristics of the bearing and its parts, otherwise it is difficult to ensure that the bearing repair has The desired effect.
First, the economic benefits of bearing repair
In general, the number of bearings is small, the number is large, the price of a single bearing is high, or the structure of the bearing is simple. If the size is large, the cost of repair is relatively low, and the economic benefit is higher.
In addition, monitoring the operation of the bearing, and planning to repair the bearing before failure, can get twice the result with half the effort. Following a reasonable process, using efficient repair equipment and tools, and getting help from a professional bearing plant can help increase economic efficiency.
Second, the benefits of cooperation with professional bearing companies
In the business of repairing bearings, if the cooperation of professional bearing companies can be obtained, the following benefits may be obtained:
(1) The technical requirements of each process of repair can be clarified, and how to ensure the overall quality of the repaired bearings,
(2) It is possible to utilize many of the specialized experience of specialized bearing plants, which can reliably, efficiently and economically meet process requirements;
(3) It is possible to order a tool for a professional bearing company, which can be economical and saves a lot of trouble;
(4) Orders such as cages, rolling elements, rivets, etc. can be ordered from professional bearing companies, which may make the repair work simple, convenient and economical.

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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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