Sliding bearing,work under sliding friction bearings.Sliding bearing work steady, reliable, no noise.Under the condition of fluid lubrication, sliding surface is lubricating oil without direct contact, also can greatly reduce the friction loss and wear of surface oil film also has a certain vibration absorbing ability.But starting frictional resistance is bigger.The bearing parts of the shaft are called journal, and shaft neck matching parts called bush.In order to improve the bearing surface of the friction properties and in them on the surface of cast anti-friction material layer is called the bearing bush.Bearing and bearing liner material collectively known as the sliding bearing material.Sliding bearing applications generally under the condition of high speed light load condition.
The sliding bearing material with the commonly used bearing alloy (also called babbit or white metal),
Sliding bearing
Wear resistant cast iron, copper and aluminum alloy, powder metallurgy materials, plastics, rubber, hardwood and carbon - graphite, PTFE (teflon, PTFE), modified polyformaldehyde (POM), etc.
Sliding bearing to absorb and transfer the relative movement between the parts of force, keep the position of the two parts and positioning accuracy.In addition, but also converts directional movement to rotary motion (e.g., reciprocating piston engine).
The structure editorThe work of sliding bearing is sliding friction;The size of the sliding friction mainly depends on the accuracy of manufacture;And the size of the sliding bearing friction is mainly depends on the slip plane of the bearing material.Sliding bearing generally face all have self-lubricating function;Sliding bearing according to the material divided into sliding bearing and sliding bearing metal, not of metal.
Non-metallic sliding bearing mainly plastic bearings, plastic bearings are generally USES the engineering plastic with good performance comparison;More professional manufacturers generally have self-lubricating engineering plastics modification technology, through the fibers, special lubricants, glass beads and so on to self-lubrication engineering plastics modification to enhance performance, and then use modified plastics by injection molding processing into self-lubricating plastic bearings.
Metal sliding bearing in the 21st century is the most used three layer composite bearings, the bearings are generally based on carbon steel substrate, through sintering technology in steel plate on a layer of spherical copper powder sintered first, and then sintering layer on copper powder layer is about 0.03 mm PTFE lubricant;One intermediate layer spherical copper powder main effect is to enhance the bonding strength between the steel plate with PTFE, at work, of course, also have certain bearing and lubrication effect.
Editing of material manufacturing,1) metal materials, such as bearing alloy, bronze, aluminum alloy, zinc base alloy, etc
Bearing alloy, bearing alloy is also called the white metal, tin, lead, antimony and other metal alloy, because of its good wear resistant, high plasticity, running-in performance is good, good thermal conductivity and resistance to adhesive and good and good and oil adsorption, therefore applicable to the overloading, high-speed cases, the strength of the bearing alloy is small, the price is more expensive, must be cast in bronze, steel or cast iron shell, form a thin coating.
2) the porous metal material (powder metallurgy materials)
Porous metal materials, porous metal is a kind of powder material, it has porous organization, if the immersion in the lubricating oil, full of lubricating oil in the pores, into the oil bearing, has self lubricating performance.The toughness of the porous metal material is small, only suitable for smooth without impact load and medium and small speed.
3) the nonmetallic material
Commonly used bearing bearing plastic: plastic with phenolic plastics, nylon, ptfe and so on, plastic bearings have larger compressive strength and abrasion resistance, oil and water lubrication, also has the self-lubricating properties, but poor thermal conductivity.
Damage and prevent editordamage
Sliding bearing on the job as a result of the journal and bearing contact will produce friction, surface cause fever, even "killed", so in the design of the bearing, should choose sliding bearing materials with good sex of anti-friction bearings, suitable lubricant and appropriate supply method is adopted to improve the bearing structure for thick film lubrication, etc.
1, tile surface corrosion: spectrum analysis found that non-ferrous metal element concentration anomaly;Spectrum appeared a lot of non-ferrous metal components of sub-micron wear particles;Lubricating oil excess moisture, acid value exceeds bid.
2, shaft neck surface corrosion: spectrum analysis found that iron concentration is unusual, there are a lot of iron in iron spectrum of submicron particles, water or high acid value oil paint.
3, a shaft neck surface strain: iron spectrum have iron series cutting grinding grain or black oxide particles, metal surface heat tint.
4, tile back micro wear: spectrum analysis found that iron concentration is unusual, there are a lot of iron in iron spectrum wear submicron particles, lubricating oil moisture and acid value anomalies.
5, a bearing surface strain: iron spectrum found cutting abrasive, abrasive ingredients for non-ferrous metal.
6, tile surface spalling, finds many large size iron spectrum fatigue spalling alloy wear particles, the layered grits.
7, bearing tile burning: there are more iron spectrum by means of large size, alloy and black metal oxides.
8, bearing wear: as the axis of the metal properties (hardness, poor concessions) wait for a reason, easy to cause adhesion wear, abrasive wear, fatigue wear and fretting wear condition.
Paint rust rust prevention, the characteristic is in a sealed motor, the start motor sounds good, but in the warehouse for a period of time, motor become very abnormal sound, remove bearing serious rust.Many manufacturers will be deemed to be the front bearing, the main problem is that the insulating paint volatile acid under certain temperature and humidity of metal corrosion and protection, the formation of corrosive substances, channel sliding bearing corrosion damage.
Sliding bearing life is manufacturing, assembly, closely related to the use, must make every link, in order to make the country works the best bearing, so as to prolong the service life of bearing.
1, some enterprises in the process of production coating machine bearing no rust cleaning procedures and oil seal antirust packing in strict accordance with the requirements of the coating machine in the process of machining bearing parts and assembly after coating machine bearing products antirust processing.Such as ring in the process of turnover turnover time is too long, outer cylindrical contact corrosive liquids or gases, etc.
2, some enterprises in the production of antirust oil, cleaning products such as kerosene used quality can not reach the requirements of the technology.
3, due to a coating machine bearing steel price drop down again, resulting in coating machine bearing steel quality decline gradually.Such as non-metallic impurities content in steel on the high side, the increase of sulfur content in steel making material itself corrosion resistance drops), metallurgical structure deviation, etc.Is now used in the coating machine production enterprise source of bearing steel is miscellaneous, steel quality ichthyosaurs fraud.
4, part of the enterprise's poor environmental conditions, harmful content is high in the air, flow field is too small, it is difficult to effectively antirust processing.Coupled with the hot weather, the production workers in violation of the phenomenon such as antirust procedures were there.
5, some enterprises anti-rust paper, nylon paper (bag) and plastic tube coating machine, such as sliding bearing packing material is not accord with the requirement of roll coater bearing oil seal rustproof packaging is one of corrosion factors.
6, some enterprises coating machine sliding bearing ring turning small allowance and allowance of grinding, the oxide coating on the outer circle, failed to completely remove decarburization layer is also one of the reasons.