Bearing the crack damage is how cause? Cause after?

Cracks and defects when bearing parts of stress was beyond the limit stress fracture of the material, the surface or the inner fracture and local fracture occurs, this makes the material discontinuity or fracture phenomenon called crack. Under the material surface or surface layer have a seemingly small crack called hairline hair. When hair lines extended to a certain degree, and makes the material without the base parts of the phenomenon is called fracture. Crack generally is linear, the direction, with a certain length and depth ( Wide) Degrees, have roots and sharp edge. Crack has the branch of internal cracks and surface crack, also has a visible and invisible to the naked eye in two forms, for crack need to adopt the method of nondestructive testing is not visible to the naked eye. Hair lines generally are thin line, the direction along the direction of the discontinuous distribution of rolling steel, has a certain length and depth, sometimes a single or several. The causes of crack is relatively complex, many factors influence, such as raw material, forging, stamping, folding, heat treatment, grinding, such as local excessive stress. Hair grain steel is the cause of formation in the smelting process of bubbles or inclusions, after rolling deformation exists in the material surface. To crack need to adopt the method of nondestructive testing is not visible to the naked eye. Crack prevention measures are mainly in the manufacture of non-metallic inclusion, surface defects should be controlled raw materials such as slag, folding, microscopic porosity, shrinkage cavity, bubbles, etc. Control, the internal stress of stress such as heat treatment quenching processing ( The thermal stress and organization stress) Stamping, grinding stress, stress, etc. Note bearing installed in use in the process of abnormal knocking ( Bump) Strike and large local stress, which is usually caused by poor installation, etc. In addition, to ensure lubrication, enhance the sealing effect, control external impurities flow, avoid bearing contact with corrosive substances, etc. Bearing comprehensive repair? The comprehensive repair including of the bearing damage after cleaning, disassembly, inspection, bearing roller grinding or replace inside and outside the circle, the new rolling system build/original grinding roller, roller replacement, assembling, clearance adjustment and strict inspection packing and so on comprehensive repair procedures, to ensure that after repair of bearing can meet the performance requirements of the new bearing. What kind of bearings can be repaired? Bearing comprehensive repair mainly for the large size of rolling bearings (high relative product cost Such as transmission bearings, work roll bearings, bearing roller bearing and roller mill bearings, etc. ) 。 Of course, small aperture bearing is also can be repaired. Repair technical difficulties if bearing repair what exists in the technical difficulty. Basically can think, as long as it is rolling bearing can be repaired. In need of repair of bearing installation size we don't do change, because if you change its installation dimensions, the bearing cannot be installed properly. However, because of repair required some machining processing, bearing on the size of internal there must be a change, we can through the other way, the grinding quantity compensation. After repair of bearing can really be good as new? However, after the repair of bearing can really good, such as the new? Baosteel staff, we have our own a set of test methods. After repair of the bearing and the new bearing by test showed that no difference. At present, many industrial enterprises on the bearing repair has become an international ( Including steel, metallurgy, energy, paper making, cement, airlines and car racing, and many other industries) The important measures to reduce costs, and the bearing repair for their decreased production equipment running cost, save the production equipment bearing purchasing cost can reach 20% 90%. Cause bearing damage is not all of the bearing damage can be repaired, but for each of the damage of bearing before you consider to repair or replace new bearing, must be the reason and degree of damage assessment in order to avoid or reduce the damage once again. Bearing damage caused by many reasons, such as improper installation, filth from invading as well or water intrusion is a lot of bearing a common cause of early damage. Here are some of the large size bearing and the corresponding analysis of the causes of the common damage can extend the life of the bearing of preventive measures. 一个。 Improper operation, improper installation, operation, or remove the bracket will be may cause deformation or defect prevention measures: use the appropriate operation, installation and removal tools. B。 Insufficient lubrication, lubrication inadequate or inappropriate may result in components abrasion or serious bearing deformation preventive measures: improve the lubrication system, properly supplement or replace lubricant regularly. C。 Rust and corrosion: contact with water may cause corrosion damage of bearing elements and rust. After corrosion damage of bearing can lead to spalling preventive measures at work: regular inspection seal, ensure good sealing effect, correct storage bearing. D。 Current: bearing rotates the electricity may result in a groove or notch. Bearing static, electrical grounding improper operation will lead to a slight burn prevention measures: outside of bearing parts before welding current can be reduced or avoided through proper grounding connection by bearings. E. External material: wear particle pollution and debris intrusion can lead to bearing face precautions: wear, abrasion and sag into particles and debris, replacement of lubricants, check the sealing system. F。 Eccentric, eccentric, tilt, or excessive load may result in geometrical stress concentration or surface spalling preventive measures: precision machining housings and shoulder. S s s jiaxing seiko co. , LTD. ( Professional motor bearing application solutions provider) Focus on miniature high speed, low noise, long life motor bearing telephone: fax: an article on the sales @ : bearing ring processing technology analysis and solution for the next article: how to improve the effect of the bearing grease and life?