Daily judgment of rolling hardware bearings

It is understood that knowing it can be used, to understand the functionality of hardware tools, in order to use it. Bearings, you can look at its finish (or roughness) first, the quality is good, you don't have to talk about it. Looking further, you can hold the bearing in your hand and turn it hard to see if it rotates very smoothly and naturally, without noise.

 The general 6xXXX series bearings used by nsk are really easy to use, that is, the price is more than double that of domestic ones. But its life is high, compared to most domestic bearings, one can be used for the top two. So the price is still cost-effective.

 There aren't many shops selling professional bearings. You can go to the hardware store to buy them. (There are some places where you can sell auto parts, motorcycle parts, and belts.) You don't have to go to a small shop. Generally, fixed stores with such bearings will make a very eye-catching brand. When you buy, you ask them to invoice, generally do not give fakes.

 I have used Harbin in domestic bearings, and it is more affordable to buy. The quality is also good. But after a long time, the noise is a little loud and needs lubrication, otherwise it should be rusted.

 Singapore's bearings are of quality between nsk and domestic.

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Causes of damage to the clutch release bearing

      Causes of damage to the clutch release bearing
1. Working conditions and stress of clutch release bearing
The separation bearing is subjected to axial load, impact load, and radial centrifugal force during high-speed rotation during use. Further, since the fork thrust and the reaction force of the separation lever are not in the same straight line, a torsional moment is also formed. Clutch release bearings have poor operating conditions, intermittent high-speed rotation and high-speed friction, high temperature, poor lubrication conditions, and no cooling conditions.
2. Reasons for damage to the clutch release bearing
The damage of the clutch release bearing has a lot to do with the driver's operation, maintenance and adjustment. The causes of the damage are as follows:
1) The operating temperature is too high to cause overheating
Many drivers often turn the clutch halfway when turning or decelerating, and some of the gears are placed on the clutch pedal. Some vehicles have too large free travel adjustment, which makes the clutch separation incomplete, in a semi-engaged and semi-detached state. The dry friction causes a large amount of heat transfer to the separation bearing. The bearing is heated to a certain temperature, and the butter melts or dilutes the flow, so that the temperature of the separation bearing is further increased, and when the temperature reaches a certain level, it burns out.
2) wear and tear without lubrication
The clutch release bearing is lubricated with butter. There are two ways to add the butter. For the 360111 release bearing, the rear cover of the bearing should be opened to fill the grease during maintenance or when the transmission is removed, and then the rear cover should be reinstalled. For the 788611K release bearing, it can be removed and placed in molten grease for digesting, and then taken out after cooling to achieve the purpose of lubrication. In actual work, the driver easily overlooks this, resulting in a lack of oil in the clutch release bearing. The amount of wear of the separated bearing in the case of no lubrication or less lubrication is often several to several tens of times the amount of wear after lubrication. As the wear increases, the temperature will also increase greatly, which makes it more vulnerable.
3) Free travel is too small or too many loads
According to the requirements, the clearance between the general clutch release bearing and the separating lever is 2.5mm, which is reflected in the free travel of the clutch pedal is 30-40mm, the free travel is too small or there is no free travel at all, which will make the separation lever and The release bearing is in a normally engaged state. According to the principle of fatigue failure, the longer the bearing working time, the more serious the damage; the more the number of loads, the more likely the separation bearing is to cause fatigue damage. Moreover, the longer the working time, the higher the temperature of the bearing, and the easier it is to burn, reducing the service life of the separation bearing.
4) In addition to the above three reasons, whether the separation lever is adjusted flat, whether the separation bearing return spring is good or not, has a great influence on the damage of the separation bearing.

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Bearing housing and shaft and bearing clearance

Core Tip: Mounting of the bearing housing. Standard type Several methods of mounting the bearing housing with the snap ring and the retaining plate. Mounting the bearing with the set screw will cause the bearing casing to deform and should be avoided as much as possible.
Bearing housing installation
Standard type
Several methods of mounting the bearing housing with snap rings and retaining plates.
Mounting the bearing with the set screw will cause the bearing casing to deform and should be avoided as much as possible.
Flange type
When installing a flange type linear bearing, the precision of the surface of the bearing housing must be accurate.
Adjustable type (small opening type)
The bearing is perpendicular to the opening in the bearing housing to obtain a uniform preload in the circumferential direction.
Large open type
If used in conjunction with a suitable housing, large-open bearings can also be adjusted for clearance, even with light preload.
.Precautions during installation
When the linear bearing is installed in the bearing housing, auxiliary work should be used to avoid direct tapping of the end face or the sealing ring. The bearing should be evenly introduced, and the buffer plate should be used to load it with a gentle tap.
To thread the optical axis into the linear bearing, the shaft and the centerline of the bearing must be aligned. If the shaft is inserted obliquely, the balls may fall off or cause the cage to be deformed and damage the linear bearings.
The applied load should be evenly distributed over the entire bearing, especially when subjected to transient loads. Two or more bearings should be used. Linear bearings are not subject to rotating loads, which can cause accidents.

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High-speed wire rod mill bearing and its application

Core Tip: In order to meet the increasing demand for steel for construction, China's metallurgical industry has introduced dozens of high-speed wire production lines from abroad in recent years. The speed of the discharge port ranges from 63 to 100 m/s.
In order to meet the increasing demand for steel for construction, China's metallurgical industry has introduced dozens of high-speed wire production lines from abroad in recent years. The speed of the discharge port ranges from 63 to 100m/s, and the annual output is mostly 60×104～100×. Between 104t. Due to the particularity of the work of the high-speed rolling mill, more stringent requirements are imposed on the bearings used. This paper briefly introduces the working characteristics, structural form, design points and manufacturing key of high-speed wire rod mill bearings (hereinafter referred to as high-speed rolling mill bearings).
1 Performance requirements
1.1 High reliability
The most notable feature of the high-speed wire production line is the high reliability of the continuous operation of the rolling mill. Due to the high unit output of the high-speed wire production line, it is required that the bearing which is a key component of the rolling mill has higher reliability than the general rolling mill bearing in the prescribed inspection cycle. If the failure of the bearing will cause the entire production line to stop production, this is not tolerated by the manufacturer. Therefore, when designing and manufacturing high-speed rolling mill bearings, the reliability of continuous operation under high-speed operating conditions should be guaranteed.
1.2 wear resistance
High-speed rolling mill bearings have strong wear resistance and can adapt to high-speed rotating work. Example: A high-speed wire production line with an exit line speed of 63m/s and an outlet mill roll with a working diameter of 330mm, the bearing's working speed is 3650r/min, long-term operation under high speed and heavy load, and wear resistance to the bearing. It is a severe test. This requires that the bearings supplied must have wear resistance requirements.
1.3 Long fatigue life
High-speed rolling mill bearings have a long fatigue life. Under normal circumstances, the high-speed rolling mill bearings provided abroad are used for three years (because half of the time, the roller components are to be unloaded for maintenance and repair, and the actual working time is one and a half years), so the user requires domestic bearings to be used for at least two years.
1.4 Impact toughness is better
The impact toughness of the high-speed rolling mill bearing is better, especially for the bearing used in the rough rolling mill. The impact load is large during the rolling of the continuous casting billet into a bar stock. Therefore, high-speed rolling mill bearings should not crack when working under high speed and high impact.
In summary, the working characteristics of the high-speed rolling mill bearing is that it can work stably and reliably under high-speed and high-impact conditions, and has a long fatigue life.

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