Deformation control measures of INA Bearing during heat treatment

Use reasonable cooling methods of INA Bearing during heat treatment

The influence of cooling process on deformation after metal quenching is also a very important deformation reason. The deformation of hot oil quenching is smaller than that of cold oil quenching, which is generally controlled at 100 ± 20 ℃. The cooling capacity of oil is also crucial to deformation. The stirring method and speed of quenching affect the deformation.
The faster the cooling speed of metal INA Bearing during heat treatment, the more uneven the cooling, the greater the stress generated, and the greater the deformation of the die. Pre cooling can be used as far as possible on the premise of ensuring the hardness requirements of the mold; Step cooling and quenching can significantly reduce the thermal stress and structural stress produced during metal quenching, and it is an effective method to reduce the deformation of some workpieces with complex shapes; For some workpieces with special complexity or high accuracy requirements, isothermal quenching can significantly reduce deformation.

On the premise of ensuring the same hardness requirements, try to use oily medium. Experiments and practice have proved that under the premise of no difference in other conditions, the cooling speed of oily medium is INA Bearing during heat treatment slow, while that of aqueous medium is relatively fast. Moreover, compared with oily medium, the change of water temperature has a greater impact on the cooling characteristics of aqueous medium.
Under the same INA Bearing during heat treatment conditions, the deformation of oily medium after quenching is relatively small compared with that of aqueous medium.

during the cooling process after INA Bearing during heat treatment, the thin part always cools fast, and the thick part cools slowly. Under the condition of meeting the actual production needs, the great difference between the thickness of the workpiece should be reduced as far as possible, and the section of the part should be as uniform as possible, so as to reduce the distortion and cracking tendency in the transition zone due to stress concentration.
The symmetry of structure and material composition and organization should be maintained as far as possible to reduce the distortion caused by uneven cooling.
The workpiece should avoid sharp edges, grooves, etc. as far as possible, and there should be fillet transition at the thickness junction and steps of the workpiece; Try to reduce the asymmetry of hole and groove reinforcement structure on the workpiece; The method of reserving processing quantity is adopted for parts with uneven thickness.

INA Bearing selection should take into account the price of INA Bearing during heat treatment, or use INA Bearing with higher load capacity but more expensive, or use ordinary INA Bearing and try to prolong its service life.
Ina bearings with high load capacity are used, such as cylindrical roller ina bearings with convexity, spherical roller ina bearings with symmetrical rollers, reinforced tapered roller ina bearings and ball ina bearings, ball ina bearings with modified ball groove bus, or 70000cd series ina bearings are used to replace deep groove (single row centripetal) ball ina bearings. These ina bearings with high load capacity or due to the improvement of stress distribution, Or there may be higher fatigue life due to the large number of rolling elements.

In order to choose the proper size of INA Bearing during heat treatment, the working load, rotating speed and operating temperature of INA Bearing must be accurately calculated or verified.
Load has a great impact on the service life of INA Bearing during heat treatment, so although it is difficult to measure the load, it should also be measured as accurately as possible. When it is difficult to measure the load, the actual power consumed by the motor can be measured, and the power loss along the drive path can be calculated INA Bearing during heat treatment and deducted until the ina bearing load that is closer to the actual load is calculated. If the calculated or measured load is too large, the expected fatigue life of INA Bearing will inevitably be reduced by a larger margin, which must be remedied.
If the installation position allows, the INA Bearing with a larger size can be selected; If the radial dimension is limited, a wider ina bearing should be selected when there is a wider ina bearing; If the wider INA Bearing cannot be used, the INA Bearing with higher load carrying capacity can be used.

The price of ina bearing material should also be taken into account. When vacuum smelting or electroslag remelting steel has to be used, it should be noted that the lubrication conditions must be improved in order to double the expected fatigue life of INA Bearing.
Of course, the cost of selecting ina bearings made of this kind of high-quality steel is much higher than that of selecting INA Bearing during heat treatment with high load capacity. However, for ina bearings that are difficult to access in machines and are extremely difficult to install and disassemble, or ina bearings used in mining and tunnel operation machinery, it is sometimes necessary to consider using them in situations where maintenance is extremely difficult.