What are the causes of cracking of bearing rings?

1. Cracking of the outer ring of deep groove ball bearings and its causes.

If the outer ring of the bearing is fractured, the cross-section is basically perpendicular to the surface, and the cross-section starts from the lower surface of the outer inner diameter on the right side of the raceway in the figure, and rapidly expands to the outer surface and to the left side to the fracture. There is no obvious plastic deformation in the fracture of the outer ring of the bearing, and it is characterized by brittle fracture. After analysis, the protective atmosphere in the heat treatment furnace of the bearing ring is a mixture of a variety of gases, including oxidizing gas, neutral gas, reducing gas and carburizing gas.

When heated at high temperatures, its chemical reaction is very complex, whether it is a decarburization reaction or a carburization reaction, in addition to the participation of free oxygen atoms, it can reach equilibrium under certain conditions, and even carry out reversible reactions. Correct selection and design of heating parameters such as heating medium, heating speed, heating temperature and holding time; Strictly control the uniformity of furnace temperature, and do not fluctuate too much. By controlling the carbon potential in the furnace, the carbon concentration and concentration gradient of the bearing ring are strictly controlled, so as to ensure the heat treatment quality and service life of the ring.

2. Cracked bearing rings and causes.

If the bearing cracks during use, once the bearing ring is peeled off by contact fatigue, it will lead to its instability, coupled with the high hardness and brittleness of the material, a one-time brittle fracture begins to occur in the area of local spalling, that is, a straighter macroscopic crack, the microscopic fracture is straighter, and the rapid expansion area accounts for most of the area of the fracture section.

Factors that cause contact fatigue include the structure of the material, the surface strengthening process, the surface roughness of the workpiece, the lubricant and the stress.

3. Cracking of the surface of the groove of the outer ring of the bearing and its causes.

After acid leaching treatment of the outer ring of a fractured bearing, it can be seen that the surface of the groove shows severe black burn marks and horizontal cracks that are basically perpendicular to the grinding direction, and a crescent-shaped burn layer is presented on the fracture, and the fracture is fine porcelain-shaped, and the crack at the trench is rapidly advanced inward to complete fracture. The parallel cracks on the surface of the groove of the outer ring of the bearing are typical grinding cracks, which are mainly caused by factors such as excessive grinding amount and poor grinding process conditions. Secondly, the bearing outer ring is not tempered sufficiently, which also increases its susceptibility to grinding cracking. This phenomenon occurs even when the current intensity is relatively weak, and over time, the annular pit will develop into corrugated grooves.

These corrugated grooves can only be found on the contact surface of the roller and ferrule raceways, not on the steel balls, but only in a darkened color. These corrugated grooves are equidistant, and the bottom of the grooves on the raceway is darkened.

4. Cracking of the groove surface of the inner ring of the bearing and its causes.

After coarsely grinding the raceway surface of the inner ring, magnetic particle testing found that there were many small cracks on both sides of the raceway, especially near the oil groove, and there were many deep cracks and warping in individual rings perpendicular to the grinding direction of the grinding wheel. After warp cutting, the entire piece of material is also detached from the raceway surface. After hot pickling, it was found that there were cracks on the raceway surfaces on both sides of the inner ring of the bearing, and the shape of the cracks was mostly net-shaped, and there were also linear cracks perpendicular to the grinding direction.

In order to avoid the occurrence of grinding cracks, it is necessary to reduce the generation of grinding heat and accelerate the heat dissipation.

The reason for the round cracking of the bearing sleeve may first be the cracking caused by the material problem itself, and secondly, the cracking caused by the matching of the bearing and the bearing sleeve.

The reason for the cracking of the bearing ring may be that the bearing lubrication is not enough, or it may be caused by too high frequency and too heat!

Causes and countermeasures of bearing ring fracture Causes and countermeasures of bearing ring fracture Ring fracture is one of the problems that plague the quality of bearings, and defect fracture is the main form of ring fracture.

Generally speaking, it is affected by temperature, or if you use too much, there will be some wear. And he cracked naturally.

What causes cracking of bearing rings? I think it's possible that cracking like this is caused by too much internal pressure.

The reason for the total cracking of the bearing sleeve may be due to the low temperature.

A play with water is caused by the poor quality and unrefined production just now.

What is the cause of this group of check-in cracks, there are many reasons for this, how big your machine is, the lubricating oil may be better.

What are the causes of cracking of bearing rings? Log in to the official ** of the bearing ring to consult.

Hello, this friend may be caused by excessive air pressure, you can check it, whether the other is too big this friend, do you have any questions?

Most of the reasons for the cracking of bearing rings are poor rigidity and backward heat treatment technology.

There are many reasons for the cracking of bearing rings, and the main reasons are the following:

1.During installation, the unsuitable metal installation tool strikes on the end face or outer surface of the bearing ring, causing micro-cracks in the bearing ring, and cracking the ring with the load and temperature rise during use.

2.There are internal defects in the selected bearing materials, or defects in the heat treatment process, resulting in microcracks or stress or liquid concentration in the material. In the process of work, with the temperature rise and the action of the load, the micro-cracks are increased, resulting in the cracking of the ferrule.

3.The bearing selection is not suitable, or the equipment works abnormally, resulting in a large load on the bearing, exceeding the ultimate working load of the bearing, resulting in ring breakage.

Summary. The reasons for the cracking of the bearing: (1) the martensite arrangement must be small, because the brittleness of the coarse martensite is large, and there are even many microcracks, which are prone to grinding cracks; (2) Strictly control the carbide grade, because the carbide is a brittle phase, its cracking resistance is low, and the thermal conductivity is poor, and the carbide grade can greatly reduce the probability of grinding; (3) The remaining austenite is less, the thermal conductivity of the remaining austenite is only half of the martensite, the more the remaining austenite, the greater the thermal stress in the grinding process, and the grinding tendency is also increased.

The reasons for the cracking of the bearing: (1) the martensitic arrangement must be changed slightly, because the brittleness of the coarse martensite is large, and there are even many microcracks, which are prone to grinding cracks; (2) Strictly control the carbide grade, because the carbide is a brittle phase, its cracking resistance is low, and the thermal conductivity is poor, and the control of the carbide grade silver ridge can greatly reduce the probability of grinding; (3) The residual austenite front infiltration is less, the thermal conductivity of the remaining austenite is only half of the martensite, the more the remaining austenite, the greater the thermal stress in the grinding process, and the grinding tendency is also increased.

I consulted that after seven or eight years of use by the customer, the inner ring of the bearing cracked.

The rear test shaft is positive for 5s

1. The inner ring or outer ring of the bearing is too loose, and the inner ring or outer ring of the bearing has creep phenomenon during rotation, and the creep deformation will cause fatigue (accompanied by noise) along the cross-sectional direction of the bearing, and the fatigue will produce cracks for a certain period of time, which will eventually lead to the fracture of the limb. 2. The inner ring of the bearing is too tightly fitted, which leads to the cracking of the inner ring of the bearing.

6203 Axis Yong.

The inner ring of the bearing collapses and fits too tightly, resulting in excessive tensile stress along the circumferential direction of the inner ring of the bearing, and when the bearing rotates, it leads to the superposition of local stress concentrations under the action of external impact force (more or less inevitable). This causes cracks in the bearing group (accompanied by noise), which eventually leads to fracture after further propagation.

Is there a tolerance limit for the inner ring fit.

Therefore, the inner ring of my boring type of bearing has a deviation tolerance of 0 to several to ensure that the inner ring does not rotate, so the bearing generally chooses the transition fit, even if the transition fit can not exceed the 3 wires of the transport over the guess of the profit.

Summary. Hello dear, happy to answer for you.

The causes of ball rupture in the inner ring of SKF bearings are as follows.

1. The material is rolled, and the ball is cracked during use after being installed inside the bearing, and the cracking direction is the direction of material rolling.

2. There are obvious loose bands in the core of the ball, and the ribbon carbide exceeds the standard and contains abnormal elements such as oxygen, calcium, and magnesium on the surface. In addition, the depth of the strip is about that, it is determined that there is a residual shrinkage porosity in the core of the ball, which is a metallurgical defect, which is also the main cause of the cracking of the ball during use.

3. The quenching and tempering structure of the ball is overheated to increase its brittleness, reduce the compressive strength, and make the ball more prone to cracking.

Causes of inner ring roller rupture in SKF bearings.

Hello dear, I am glad to answer the reasons for the rupture of the inner ring of SKF bearings as follows: 1. The material is rolled, and the balls are cracked during the use of the bearing after being installed, and the cracking direction is the rolling direction of the cavernous material. 2. There are obvious loose bands in the core of the ball, and the ribbon carbide exceeds the standard and contains abnormal elements such as oxygen, calcium, and magnesium on the surface. In addition, the depth of the strip is about that, it is determined that there is a residual shrinkage porosity in the core of the ball, which is a metallurgical defect, which is also the main cause of the cracking of the ball during use.

3. The quenching and tempering structure of the ball is overheated to increase its brittleness, reduce the compressive strength, and make the ball more prone to cracking.

I hope mine can help you, and I wish you a happy life in solving problems, oh dear <>

Scratches during the processing of bearing ring grooves may be caused by the following reasons:1Excessive tool wear:

If the tool using the trouser is worn excessively, the cutting force will increase, resulting in scratches or scratches on the surface of the bearing ring during machining. 2.The surface hardness of the bearing ring is too high

If the surface hardness of the bearing ring is too high, the tool will not be able to cut, resulting in scratches or scratches. 3.Cutting data is not suitable:

If the selected cutting data is not suitable, such as too fast cutting speed, too large feed, etc., it will also cause scratches or scratches on the bearing ring surface. 4.Cutting nonsense dust liquid is not suitable:

If the cutting fluid used is not suitable, it may exacerbate scratches or scratches on the surface of the bearing ring. In order to avoid scratches during the machining of bearing ring grooves, it is necessary to choose the right cutting tool, select the right cutting data, and use the right cutting fluid. In addition, some surface treatment methods, such as polishing, can be used to improve the surface finish and hardness of the bearing ring.

Dear, hello, the reasons for scratches during the processing of bearing ring grooves may be as follows:1Tool wear:

Tool wear can lead to scratches on the machined surface, so the socks need to be checked and replaced frequently. 2.The hardness of the workpiece material is too high

If the hardness of the workpiece is too high, it is easy to produce scratches during machining, so it is necessary to choose the right tool and machining parameters. 3.Overheating during machining:

Overheated machining processes can lead to scratches on the surface of the workpiece, so it is necessary to control the processing temperature and cool it down in time. 4.Foreign matter on the surface of the workpiece:

Foreign matter on the surface of the workpiece can cause scratches on the machined surface, so it is necessary to ensure that the surface of the workpiece is clean. 5.Improper tool selection:

If the selected tool is not suitable for machining the workpiece, it will also lead to scratches on the surface of the machining cavity, so it is necessary to select or match the appropriate tool. In order to avoid scratches during the machining of the bearing ring groove, it is necessary to ensure the quality and wear of the tool, control the machining temperature, and keep the surface of the workpiece clean. In addition, it is necessary to select the appropriate machining parameters and tools according to the material and size of the workpiece.

Summary. 1.Use overload.

If the load on the bearing is too high, it may cause the inner ring to burst. 2.Poor processing.

Poor machining of the bearing can lead to excessive local stresses, which can cause the inner ring to burst. 3.Excessive use time.

If the bearing is used for too long, wear will increase, which can lead to the inner ring bursting. 4.Lack of regular maintenance.

Regular maintenance reduces bearing wear and tear, which reduces the likelihood of the inner ring bursting.

Excessive load. I'm sorry I don't understand, but can you elaborate on that?

1.Use overload. If the load on the bearing is too high, it may cause the inner ring to burst.

2.Poor processing. Poor machining of bearings can lead to excessive local stress, which can cause the inner ring to burst from the hidden brother.

3.Excessive use time. If the bearing is used for too long, wear will increase, which can lead to the inner ring bursting.

Stove Bridge Raid 4Lack of regular maintenance. Regular maintenance reduces bearing wear and tear, which reduces the likelihood of the inner ring bursting. Elimination.

1.First of all, the inner ring of the bearing should be subjected to a sufficient pressure, which can be increased to the maximum capacity of the inner ring of the bearing using a Gauches roller cylinder or a high-pressure pump. 2.

Secondly, the bearing can be placed in a high-temperature environment to change the elasticity of the inner ring of the bearing, so that the pressure forms a greater pressure on the inner ring of the bearing. 3.Finally, an external force can be applied to the inner ring of the shaft backbalance to put more pressure on the inner ring of the bearing, which will eventually cause it to burst.