How to deal with TIMKEN rolling bearing heat treatment deformation damage

1. Reasonable use of cooling method: metal cooling process after quenching effect on the deformation is also important a reason. Hot oil quenching oil quenching than cold deformation is small, general control in the 100-20 ℃. Oil cooling ability of deformation is also very important. The mixing way and speed of the quenching influence the deformation. The faster the cooling rate of metal heat treatment, the uneven cooling, the stress, the greater the mold imported bearings of shape. Under the premise of can ensure that the mold hardness requirements, as far as possible use precooling; Using hierarchical cooling quenching can significantly reduce the metal thermal stress and organization stress formed during quenching, is the effective method to reduce some of the more complex shape workpiece deformation; For some special complex or higher accuracy of workpiece, using isothermal quenching can significantly reduce the deformation. 2. Use appropriate medium: on the premise of guarantee the same hardness requirements, as far as possible the oily medium, experiment and practice has proved that to other conditions under the premise of no difference, the slower cooling rate of oily medium, and the cooling speed of water medium is relatively fast. And, compared with those of oily medium temperature change on the influences of aqueous medium cooling characteristics, under the condition of the same heat treatment, relatively oily medium aqueous medium NSK bearings after quenching deformation is relatively small. 3. Parts structure to be reasonable: metal during cooling after heat treatment, is always the thin part soon cold, the thick part of the cold slowly. In meet the need of actual production situation, we should try to reduce the workpiece thickness disparity, parts of section to uniform, to reduce the transition region due to stress concentration produce distortion and cracking tendency; Artifacts should keep the structure and material composition and microstructure of symmetry, in order to reduce the distortion caused by uneven cooling. Artifacts should try to avoid sharp edges, grooves, etc. , in addition, the thickness of the workpiece on the border, the steps to place with rounded transition; As far as possible to reduce the workpiece hole and slot on the reinforcement structural asymmetry; Adopt the method of reserve was uneven thickness of parts. Reflected in TIMKEN bearing vibration measurement, bearing vibration of TIMKEN bearing damage is very fast, with is that after adopting extraordinary TIMKEN bearing vibration tester ( Frequency analyzer, etc. ) Can measure the size of the vibration, through frequency points not received measure of specific circumstances. Due to the measured values due to the use of the bearing condition or sensors installed position and differences, therefore necessary prior to each machine after analysis compared with the measured values must determine scale. Assuming operating oil hole can directly measure the bearing outer ring temperature, more accord with. Typically, bearing temperature, usually in accordance with the TIMKEN bearing of outdoor temperature can be measured in received. Assume that smooth, set to, the TIMKEN bearing temperature will rise sharply, will appear very high temperature, then must stop running, adopt necessary to guard against French. Usually, the bearing temperature followed the preliminary stage of operation of bearing slowly rise, 1 - Two hours later to difficult condition. Deformity of TIMKEN bearing temperature due to mechanical heat capacity TIMKEN bearing even if has the damage, such as the small strip will be a very and irregular, and therefore sentenced to staff, using sound device about adopt sound device, the size and quality of bearing move sound in operation for a raid, rise to prevent in advance). End is to raid TIMKEN bearing migration transformation temperature, avoid burning shaft transactions occur. TIMKEN bearing corrosion suggestion and methods to prevent TIMKEN bearing corrosion is caused by variety of connotation and meaning of the composition, sums up the primary are: 1. Metal appearance bright and clean degree, The oxygen concentration cell corrosion) 。 2. Chemical composition and structure of metal material itself. 3. With the solution composition and pH value of the metal structure appearance; 4. Temperature and humidity condition. 5. And in the various conditions of the constitutive medium metal in appearance. 6. The sweat of others is also a sign of TIMKEN bearing corrosion, its pH value of 5 - 6. To is to avoid hand sweat cause corrosion, set and make staff should wear gloves, don't literally hand TIMKEN bearing structure.