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Mill bearing equipment and protection
Source: China Bearing Network Time: 2014-10-05
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1. Preparation before the device. 1) The cooperation should be coordinated before the installation; the cooperation appearance including the roll neck, bearing housing, bearing ring and bearing box cover should be carefully checked; the dimensions and shape orientation accuracy and cooperation cover should be viewed. Can match the skill needs of the depiction.
.2) The appearance of the joint with the bearing; the edge of the roll neck, the bearing box hole and the oil hole and the burr must be removed by shovel; and the clean and smooth oil is removed.
2, four-row cylindrical roller bearing device. 1) device labyrinth ring (waterproof cover)
The cooperation between the labyrinth ring and the roll neck is usually a tight dynamic cooperation; the device needs to be slammed with a copper rod. The two sides of the labyrinth ring need to be parallel and closely fit with the shaft shoulder and the inner ring of the bearing.
.2) The cooperation between the inner ring and the roll neck of the four-row cylindrical Zizi bearing in the inner ring of the device is an interference cooperation; the inner ring should be heated to 90-100 ° C first. Do not exceed 120 ° C; to avoid the inner ring after cooling Retraction is not thorough. Heating method can be heated by oil tank or induction heating; surely stop heating with open flame.
The increase in the inner diameter when heating with the oil sump is calculated according to the following formula:
Δd=12. 5×10 -6 Δt. d
Where: â–³d--the inner ring inner diameter is increased after heating (mm)
△t--the difference between oil temperature and room temperature (°C); room temperature specification is 20 °C.
D--inner inner diameter (mm)
In the case of a double inner ring such as the FCD type; it is necessary to make the inner ring and the inner ring axially in the process of cooling the inner ring; the inner ring is attached to the end face of the labyrinth ring; and the feeler is checked with a feeler gauge.
.3) The outer ring of the four-row cylindrical roller bearing of the outer ring of the device is usually in transitional cooperation with the inner hole of the bearing housing; for the smaller bearing; the outer ring and the whole of the roller and the bracket are slammed with copper rods. Into the bearing housing. For larger bearings; use the outer ring or the lifting holes provided on the frame; lift the outer ring and outer ring assembly; straight down into the bearing box.
For FCDP type four-row cylindrical roller bearings with live ribs; side retaining ring, outer ring assembly, middle retaining ring; the same type of bearing should not be exchanged.
The I, II, III, and IV symbols on the end face of the outer ring are the marks of the load zone (see Figure 1). When the primary device is used, the direction of the rolling load should be aligned with the first symbol; Let the rolling load be sequentially aligned with other symbol marks; to extend the bearing life.
3, thrust thrust (positioning) bearing thrust bearing has four-point ball bearing, double row (single row) angle bracket ball bearing; two-way thrust cone and cylindrical roller bearing; è¿©æ¥ The company also developed the brake roller bearing direction Force bearing.
Four-point angle ball bearings and double (single) row angle touch ball bearings are used as thrust bearings;
Figure 1: The outer ring load partition symbol diagram is forbidden to receive the load in the radial direction; therefore, the inner hole of the bearing housing corresponds to the part of the bearing; the diameter must be larger than the outer diameter of the bearing by about 0.5 mm or the roller diameter is smaller than the bearing. The inner diameter is about 0. 5 mm.
For four-point ball bearings; do not exchange the same type of separation ring when the device is installed to avoid changing the axial clearance at the factory.
Two-way thrust tapered roller or two-way thrust cylindrical roller bearing spacer circle; the same type of bearing must not be exchanged; to avoid changing the axial clearance at the factory.
It is necessary to press the end device of the inner ring of the thrust bearing; and the axial direction should be locked to avoid its relative transformation on the roll neck; the wear and burn of the roll neck cooperation surface are formed.
When the brake roller axial force bearing is used, it is axially positioned through two bearing housings; and the axial clearance is adjusted. When the bearing housing is installed; the inner ring of the bearing should be tightly attached to the inner ring of the main bearing. When the two bearing housings are fixed axially in the frame; attention should be paid to eliminating the axial movement of the bearing housing to the axial end in the process of introducing the two bearing housings into the frame.
4, four-row tapered roller bearing device four-row tapered roller bearing inner ring and roll neck cooperation is usually with a gap; the device first put the bearing into the bearing box; then the bearing box into the journal.
The outer ring of the four-row tapered roller bearing and the bearing box hole are also selected for dynamic cooperation; firstly, the outer ring A is loaded into the bearing box (see Fig. 2). The outer ring, the inner ring and the inner and outer rings are printed with character symbols at the factory; When the device is installed, it is necessary to sequentially load the bearing housing according to the order of the character symbols. It is not easy to exchange; to avoid the change of the bearing clearance.
Figure 2: Four-row tapered roller bearing layout layout All parts are placed in the bearing housing; the inner ring and the inner spacer, the outer ring and the outer spacer axially close.
Measure the gap width between the outer ring end face and the bearing box cover; to determine the thickness of the corresponding gasket.
Second, the rolling mill bearing protection and monitoring of the bearing in the application process should be strengthened protection and monitoring; to extend its life.
1. Adhere to the smooth oil road Xiaochang; select the smoothing agent according to the rules; add a smoothing agent at regular timing. Ensure the rolling appearance of the roller and the sliding appearance of the roller and the rib; adhere to the outstanding smoothness of the oil wax.
2. Regularly check the sealing condition of the seal; replace the damaged seal in time to ensure the sealing function of the bearing; avoid the water and iron oxide skin from entering the bearing; avoid the leakage of the bearing smoothing agent.
3. Contact the company's practice; actively carry out monitoring of bearing operation.
Noise monitoring: Normal operation should be a smooth humming; regular monitoring and comparison with normal sound; timely detection of abnormal conditions.
Smoothing agent monitoring: Normal smoothing agent should be clear and clean; if the smoothing agent has become dirty, there will be worn particulate pollutants.
Temperature monitoring: When the temperature rises, the operation will be abnormal. The company has started temperature monitoring operations; it is more willing to serve customers.
Establish a record card; record the number of days of bearing online use, over-steel quantity and protection monitoring; strengthen the handling of bearing operation.
Third, the rolling mill bearing smooth 1, the importance of the smoothness of the bearing is the use of oil film to separate the relative movement of the tumbling appearance of each other; not due to rough touch caused by excessive wear and failure. Users can highly focus on bearing smooth skills; Ensure stable operation and rotation accuracy at a given number of hours of operation.
2, smooth grease varieties and functional rolling mill bearing smooth into fat smooth and oil smooth; grease smooth strength is simple equipment; smooth grease is not easy to leak; there are certain waterproof, gas and other impurities into the bearing's ability; therefore usually In the case of wide application of grease smooth. In heavy load, high speed, high temperature and other conditions with oil smooth.
Smooth grease is composed of base oil, thickener and filler. The viscosity of base oil plays an important role in the smooth function of smooth grease; the function of thickener to grease; especially temperature, water resistance and oil Etc. has important influence; the additive is mainly used to enhance the anti-gasification, anti-rust, extreme pressure and other functions of smooth grease.
Smooth grease is classified according to different varieties of thickeners; it is divided into lithium base, nano base, etc. Rolling mill bearings are commonly used for lithium-based smooth grease; lithium-based grease is characterized by better water resistance; The point is higher; it can be applied to the mechanical parts of the wet and touched water. The smooth grease is divided into several grades according to its fluidity, that is, the penetration degree. The greater the penetration degree, the softer the smooth fat.
Domestically produced roll bearing smooth grease; is a multi-component lithium complex grease compounded by high-grade fat acid-proofing and synergist; also suitable for the smoothness of rolling mill bearings.
3, smooth fat filling amount of smooth fat filling; to fill the bearing and bearing shell space of one-third and one-half is appropriate; if too much fat; because of mixing and heating; will make lipids worse Or Qinhua. When filling at high speed, it should only be filled to one-third or less. When the speed is very low; to avoid external physics entering the bearing; can fill the shell space.
4, the replacement of smooth grease the use of smooth fat life is limited; its smooth function gradually decline in the process of use; wear is gradually increasing; therefore, every distance must be necessary to make up for replacement.
The compensation cycle of smooth grease is related to the layout of the bearing, the speed, the temperature and the environment; it should be determined according to the detailed working conditions of the company. Pay attention to the smooth grease replacement; the smooth grease with different trademarks can not be mixed; The fat phase of the agent is mixed; it will damage the smooth layout and consistency; if it is necessary to replace the smooth grease with different trademarks; the original smooth grease in the bearing should be completely removed; add new smooth grease.
Fourth, the rolling mill bearing storage and storage bearings is a fine mechanical components; there are more stringent requirements for its storage and storage.
.1) Treasury temperature: The bearing is coated with anti-rust oil before leaving the factory; if the temperature is too low or too high, it will cause rust-proof oil to change; the room temperature should be controlled at 0-25 °C.
.2) Warehouse humidity: Excessive humidity will cause the bearing to rust; the relative humidity of the warehouse should be maintained at 45%-60%.
.3) Treasury environment: The bearing is the best to be stored alone; when it is necessary to register with other items; other items in the same place must not be acid, alkali, salt and other chemicals.
The bearing should be placed off the ground; away from the heating pipe.
.4) Timing view: According to the rule of anti-rust of bearing products; check every 10-12 months. If the oil seal package is found to have rusty appearance; oil seal packaging should be carried out from the beginning.
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