Anhui Jateke Heavy Bearing Co., Ltd. |
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JATEC 6221 Product introduction
6221
Description
Deep groove ball bearings are mainly used to bear pure radial load, but also can bear radial load and axial load. When it is subjected to pure radial load, the contact Angle is zero. When the deep groove ball bearing has large radial clearance, it has the performance of angular contact bearing and can withstand large axial load. The friction coefficient of deep groove ball bearing is very small, the limit speed is very high, especially in the high speed operation condition of great axial load, deep groove ball bearing is more superior than thrust ball bearing.
Points for attention when using deep groove ball bearings
Keep the bearing and its surrounding environment clean, even if the naked eye can not see the smile dust into the bearing, will increase bearing wear, vibration and noise. Copy like to share WeChat friends two, the use of installation to be careful, do not allow strong stamping, do not allow direct hit bearing with the hammer, do not allow the rollers to transfer pressure. Use appropriate and accurate installation tools, try to use special tools, and try to avoid using things like cloth and short fibers. To prevent bearing corrosion, directly with the hand to take the bearing, to fully wash the hands of sweat, and coated with high-quality mineral oil after operation, in the rainy season and summer should pay special attention to rust. However, under certain special operating conditions, bearings can achieve a longer life than conventional calculations, especially in the case of light loads. These special operating conditions are surface damage that can occur when the rolling surfaces (rails and rolling parts) are effectively separated by a lubricant film to limit contaminants. In fact, under ideal conditions, the so-called permanent bearing life is possible.
Structure
Compared with other types of deep groove ball bearings, the structure is simple and the manufacturing precision is high. Therefore, it is easy to mass produce, the manufacturing cost is also low, and the use is extremely common. In addition to the basic type of deep groove ball bearings, there are a variety of structural variations, such as deep groove ball bearings with dust cover, deep groove ball bearings with rubber sealing ring, deep groove ball bearings with stop groove, deep groove ball bearings with ball gap large load capacity, double row deep groove ball bearings.
Raw Material & Capacity
Part No. | Components | Raw Material | Dimension/mm | Rated Load/KN | Weight | |
Cor | Cr | |||||
6221 | Outer Ring | Gcr15/G20CrNi2MoA | 105x190x36 | 140 | 104 | 3.79kg |
Inner Ring | Gcr15/G20CrNi2MoA | |||||
Roller | Gcr15/G20CrNi2MoA | |||||
Cage | Steel/Brass/Polyamide | |||||
Retainer | Steel/Brass/Polyamide | |||||
Space Ring | Steel/Brass/Polyamide |
Advantages
1. Deep groove ball bearings are suitable for high speed or even extremely high speed operation, and very durable, without frequent maintenance.
2. Deep groove ball bearing this kind of bearing friction coefficient is small, high limit speed, simple structure, low manufacturing cost, easy to achieve high manufacturing accuracy.
3. The size range and form of deep groove ball bearings are varied. They are used in precision instruments, low noise motors, automobiles, motorcycles and general machinery industries, and are the most widely used bearings in the machinery industry.
4, deep groove ball bearings are mainly used to bear radial load, but when the radial clearance of the bearing is increased, it has a certain performance of angular contact ball bearings, which can bear diameter and axial combined load.
5. After the deep groove ball bearing is installed on the shaft, the axial displacement of the shaft or shell in two directions can be limited within the axial clearance range of the bearing, so the axial positioning can be made in both directions. In addition, this kind of bearing also has a certain aligning ability. When tilted 2 to 4 degrees relative to the shell hole, it can still work normally.
Clearance of Deep Groove Ball Bearing
Universal Failure Modes
1. Fatigue flaking
The inner and outer ring raceways and rolling surfaces of deep groove ball bearings should bear load and relative rolling. Due to the action of alternating load, cracks (maximum shear stress) are formed under a certain depth of the surface, and then extend to the contact surface, so that the surface surface spalling pit, and finally develop into a large area of spalling, this phenomenon is fatigue spalling. According to the test procedures, the area of the fatigue spalling pit on the raceway or roller is 0.5mm2, which is regarded as the end of the bearing life.
2. Wear
Due to the invasion of dust and foreign matters, the relative movement of raceway and roller will cause surface wear, and poor lubrication will aggravate wear. Wear causes the increase of bearing clearance and surface roughness, reduces the running accuracy of the bearing, thus reducing the motion accuracy of the machine tool, and increases vibration and noise. There are different types of deep groove ball bearings, which can be selected according to the product use scenario
3. Deformation
When the bearing is subjected to excessive impact load or static load, or the additional load caused by thermal deformation, or very hard foreign body intrusion will form a dent or scratch on the raceway surface. Once the indentation occurs, the impact load generated by the indentation will further lead to the spalling of the nearby surface.
4. Rust
Water or acid or alkaline substances can cause bearing corrosion. When the bearing stops working, the temperature of the bearing drops to the dew point, and the water in the air condenses into water droplets attached to the bearing surface, which will also cause corrosion. In addition, when a current passes through the bearing, the current may pass through the contact point on the raceway and the rolling body, and the extremely thin oil film causes electric spark and electric corrosion, forming a washboard shape with uneven surface.
5. Broken
Overload may cause rupture of bearing components. Improper grinding, heat treatment and assembly will cause residual stress, and excessive thermal stress will also lead to the fracture of bearing parts. In addition, improper assembly method and process may also cause the loss of block at the flange of bearing ring and roller chamfer.
6. Bonding
When bearing parts work under the condition of poor lubrication, high speed and heavy load, they can reach a very high temperature in a very short time due to friction and heating, causing surface burns and bonding. Bonding refers to the phenomenon of metal on the surface of one part sticking to the surface of another part.
7. The cage damage
Improper assembly or use may cause the cage deformation, increase the friction between it and the rolling body, and even make some rolling body stuck can not roll, may cause the cage and the inner and outer ring friction. This damage will further aggravate vibration, noise and heating, leading to bearing damage.
JATEC Internal control size chart
Items(Um) | Outer ring | Inner ring | Rollers |
Datum end face flatness Double-ended parallelism | ≤0.003 ≤0.003 | ≤0.002 ≤0.003 | ≤0.001 ≤0.001 |
Datum end face roughness | ≤0.32 | ≤0.32 | ≤0.32 |
Outer ovality/roundness | ≤0.003/≤0.003 | ≤0.003/≤0.002 | ≤0.002 |
Raceway ovality/roundness | ≤0.003/≤0.003 | ≤0.003/≤0.002 | |
Inner hole ovality/taper | ≤0.003/≤0.003 | ≤0.003/≤0.002 | |
Raceway milling/ super roughness | ≤0.32/0.08 | ≤0.32/0.032 | ≤0.025 |
Size scattering | ≤0.01 | ≤0.01 | ≤0.002 |
Tertiary/quadratic detection | ≤0.0001 | ≤0.0001 | ≤0.0001 |
Full inspection of surface quality | Eddy current flaw detection | Eddy current flaw detection | Eddy current flaw detection |
application scenarios
It can be used for: hydraulic beneficiation equipment, coating machine, high-frequency welding machine, textile supporting electrical instrument equipment, press, anechoic chamber, bevel gear reducer, industrial dryer, bellows equipment, bean processing equipment, reboiler, gantry crane, electric pump, force and deformation detector, coding machine, petroleum equipment, vertical dryer, flattening machine