Teach you how to choose the lubrication method of NSK bearing

There are two ways to select NSK bearings for lubrication: oil lubrication and grease lubrication. There are advantages and disadvantages to each of these two lubrication methods.

Grease lubrication

Generally rolling NSK bearings are greased. Its main advantages are:

Design is very simple

Grease can seal a lot

Low maintenance costs and long service life

Under normal working and environmental conditions, it is possible for oils to achieve “lifetime lubrication”. If under high load conditions (speed, temperature, load), the grease must be replaced periodically. In order to replace the grease, it is necessary to set up pipes for supplying and removing grease and collecting used grease collectors. For short-term grease replacement, the necessary grease-injected pumps and valves should be provided.

Oil lubrication

NSK bearings should be oil lubricated when the mechanical parts near the NSK bearing have been lubricated with oil or need to be dissipated by lubricating oil. There may be heat dissipation requirements when the NSK bearing is under heavy load or high speed, or when external heat is introduced.

Micro-lubrication methods, such as drip lubrication, oil mist lubrication or oil-air lubrication, ensure that the oil loss and the NSK bearing friction are small.

When air is used as the carrier, the oil can be supplied directly and the gas flow helps to seal.

NSK bearings are extremely fast and require good cooling of the fruit, allowing a large amount of lubricant to be sprayed directly onto all contact surfaces.

1. It is very important to keep NSK imported bearings lubricated and clean.

Before we inspect the imported bearings, we should clean the surface of the NSK bearing, and then carefully check the oil seal of the NSK bearing and its surrounding parts. If it has been shown to be bad, be sure to replace it. Poor oil seal will cause damage. The NSK bearing cloud is abnormal and the equipment is shut down.

2. We also check the lubricant of NSK imported bearings

Lubrication is very important, not only for NSK bearings, but also for all imported bearings. However, please note that Japan NSK bearings should not add too much grease. Then it is to replace the lubricant of the NSK bearing. NSK bearings lubricated with oil should be refilled with fresh oil and allowed to rotate at low speed for a few minutes if the old oil is drained. As much as possible, allow the oil to collect the contaminants from the wreckage and then vent the oil. When using a grease-lubricated NSK bearing to replace grease, the cutter used should avoid any contact with cotton material in any part of the NSK bearing. Since these residual fibers may be wedged between the rolling elements and cause damage, especially the application of small bearings requires attention to this problem.

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The difference between SKF bearing vibration type and common type

The ferrule of the vibrating SKF bearing and the shaft or the seat hole require a certain transition fit or interference fit. When the interference size is SKF bearing under load, the mating surface of the SKF bearing ring on the shaft or the seat hole There is no "squirming" phenomenon on the principle.

First, let's talk about the SKF bearing vibration type. The inner and outer rings and rolling elements of the SKF bearing vibration type use vacuum degassing bearing steel, which has good fatigue resistance. Moreover, the cage is made of aluminum-iron-manganese bronze material, which has high strength, good elasticity and better wear resistance.

Second, let's look at the ordinary type of SKF bearings. SKF bearings are made of ordinary bearing steel for the inner and outer rings and rolling elements. There is also a cage made of zinc brass, which has low strength and poor elasticity.

So, how to choose SKF bearing vibration type or SKF bearing common type? The following three points are available for reference:

1 Fixed load, fixed load is characterized by a synthetic radial load vector and the ferrule is relatively stationary.

2 Rotating load, the characteristic of the rotating load is that the synthetic radial load vector rotates relative to the ferrule.

3 oscillating load and variable load, oscillating load is the load that is synthesized by rotating load much smaller than fixed load. The oscillating load means that the load applied to some ferrules may sometimes be a rotating load, sometimes a fixed load, and sometimes a oscillating load.

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Maintenance and overhaul of NA bearings

1. Eccentric INA bearing maintenance: In order to maintain the original performance of the INA bearing in a good state for as long as possible, maintenance, overhaul, and accident prevention are required to ensure the reliability of operation and improve productivity and economy.

Maintenance is best carried out on a regular basis in accordance with the operating standards for the mechanical operating conditions. The content includes monitoring of operating conditions, replenishment or replacement of lubricants, and periodic disassembly inspections.

As a maintenance item during operation, there are eccentric INA bearing rotation sound, vibration, temperature, lubricant status, and so on.

2. Overhaul of eccentric INA bearing: Cleaning of INA bearing: When disassembling the eccentric INA bearing for inspection, first record the appearance of the eccentric INA bearing, confirm the residual amount of lubricant, and after sampling the lubricant for inspection, wash the eccentric INA bearing. As a cleaning agent, gasoline and kerosene are commonly used.

The eccentric INA bearing removed is cleaned and divided into coarse and fine cleaning. They are placed in the container respectively. The metal mesh bottom is placed first so that the INA bearing does not directly touch the container. During rough cleaning, if the INA bearing is rotated with dirt, it will damage the rolling surface of the INA bearing and should be noted. In the rough cleaning oil, use a brush to remove the grease and the adhesive. After it is almost clean, it is transferred to the fine wash.

Fine washing is to carefully rotate the eccentric INA bearing while rotating in the cleaning oil. In addition, the cleaning oil should always be kept clean.

3. Inspection and judgment of eccentric INA bearing: In order to judge whether the disassembled INA bearing can be used, it should be checked after the INA bearing is cleaned. Check the raceway surface, the rolling surface, the state of the mating surface, the wear of the cage, the increase of the INA bearing clearance, and the damage and abnormality that have a drop in dimensional accuracy. For non-separable small ball INA bearings, use one hand to support the inner ring horizontally and rotate the outer ring to check if it is smooth.

Separate INA bearings such as tapered roller bearings can be inspected separately for the rolling surfaces of the rolling elements and the outer ring.

Large INA bearings cannot be rotated by hand. Pay attention to the appearance of rolling elements, raceways, cages, ribs, etc. The higher the importance of INA bearings, the more careful inspection is required.

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Rolling SKF bearing maintenance problems

Rolling bearings are a lot of mechanical parts produced, and the manufacturing precision is very strict, and the level of specialization of skills is very high. Therefore, for the types of SKF bearings that are easily bought, it is more cost-effective to purchase than to repair. Next, I thought about the repair problem of SKF bearings, namely:

(1) Many SKF bearings of the same type used in large-scale construction sites are mainly subjected to rolling wear, euphemism or fretting abrasion, especially for damaged parts, which are mostly brackets or rolling elements, while ferrules or washers are still Have repair value;

(2) Some types of SKF bearings that are difficult to purchase, have no spare parts after the failure, and have to be repaired, especially SKF bearings;

(3) SKF bearings have minor damage, such as the slight rust that occurs during the inventory period, and the slight fretting abrasions that occur during the transportation process.

(4) Large and extra large SKF bearings, which are not damaged or have been damaged, but the parts have not been seriously damaged, or valuable SKF bearings must try to extend their useful period of use;

In addition to economics, the repair of SKF bearings also has its skills, which requires repairers to fully investigate the technical requirements of SKF bearing response, and the structural, technical and data characteristics of SKF bearings and their parts, otherwise it is difficult The repair of the SKF bearing has the required results.

First, the economic benefits of SKF bearing repair:

In general, SKF bearings are small in number and large in number, and the price of a single SKF bearing is high, or the structure of the SKF bearing is simple. Large size, the lower the cost of repair, the higher the economic efficiency.

In addition, the operation status of SKF bearings is monitored, and there are plans to repair the SKF bearings in a fall, and you can get twice the result with half the effort. Compliance with sound processes, efficient repair equipment and things, and assistance from professional SKF bearing plants can help improve economic efficiency.

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