To prevent premature failure of INA stainless steel bearing should pay attention to the problem

Bearing in the process of use due to various reasons, can produce, solve the problem of the stainless steel bearing failure of what? We will classify the failure forms of rolling bearing. These forms are the most basic of rolling bearing failure three forms. Bearing failure for many reasons, all the influence factors of design and manufacturing process will be associated with the failure of INA bearings, analysis it is not easy to judge. In general, generally can be used from the two aspects of factors and internal factors considered and analyzed. Wear, poor lubrication, the invasion of the impurity and dust can cause wear and tear, rotating the INA bearing the loss of precision and failure, that is the situation, which we should pay attention to maintenance and cleaning. When bearing rotating speed is very low or intermittent oscillation, generally do not occur fatigue pitting, the bearings are often due to received a large static load or shock load and produce plastic deformation, make the stainless steel bearing failure. This is the problem of working strength, must pay and work intensity of the bearing, which is how much is your job requires speed, to choose and matching bearing ( 1) Surface under the action of transient high temperature oxide layer of the surface of the steel and the oxygen in the air, rises into extremely thin ( 20～30nm） The iron oxide thin layer. It is worth noting that the oxide layer thickness and surface grinding metamorphic layer is the total thickness test results in corresponding relation. This shows that the thickness of oxide layer, is directly related to the grinding process is an important symbol of grinding quality. ( 2) Amorphous layer organization grinding the instantaneous high temperature makes the workpiece surface reach a molten state, molten metal molecular flow is evenly coated to the work surface, and the matrix metal cooling at breakneck speed, formed a very thin layer of amorphous tissue layers. It has high hardness and toughness, but it is only about 10 nm, it is easy to be removed in the precision grinding processing. ( 3) High temperature tempering instantaneous high temperature can make the surface layer of grinding zone certain depth ( 10 ~ 100海里) Be heated to a temperature higher than the workpiece temperature tempering heat. In the absence of austenitizing temperature reached, with the improvement of heated temperature, the surface will produce one by one and heating temperature corresponding to the organization transformation, or high temperature tempering tempering hardness. The higher the heating temperature and hardness of the decline is more severe. ( 4) Transient high temperature quenching layer when the grinding area on the second floor heat the workpiece surface layer to the austenitizing temperature ( Ac1） Above, the layer of austenitizing group in the subsequent cooling process, the quenching into martensite structure anew. Where the secondary hardening burns of workpiece, the second time hardening layer must be under very low temperature tempering hardness layer. ( 5) Grinding crack two quenching burns will make workpiece surface layer stress changes. Secondary hardening zone is in compression state, the high temperature materials back to the fire area underneath there are the largest tensile stress, this is the place where the most likely to occur crack core. Crack is the most easily spread along the original austenite grain boundary. Serious burns can lead to crack of the grinding surface ( Formed a crack) Artifacts caused by scrapping. INA bearings at work, due to various complicated reasons, such as unreasonable structure, poor quality of materials, low performance, work on the surface of the defect, shock, vibration, improper installation and poor lubrication, etc. , all can cause premature failure of the stainless steel bearing. However, in some cases, some bearing was not put into use, Running) , the user is installed in the process of the integrity of the original face that have been damaged, lost its usability, cause premature bearing failure. We usually at the time of installation of stainless steel bearings, avoid the mistakes we will adopt coordinate adjustment method, in order to assure the raceway of bearing installed deformation is small, the interference fit interference quantity cannot too big, and under the high speed centrifugal force and high temperature thermal expansion, or on the surface of the offset with the normal pressure. Or make the fitting surface relaxation, thus interference quantity must under the premise of considering these two factors determine prudently, effectively under the constant velocity of the amount of interference for INA bearings may be invalid, if calculated results this contradiction is too big, Usually it happens only under ultra-high speed) 。