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Automobile Rear SKF Bearing is an important part of the drive wheel movement. SKF bearings work mainly exposed composite torsion torque withstand certain impact loads. Axle usually adjusted in the overall quality carbon steel induction hardening surface hardening, hardening layer depth 4-6mm, hardness 50 ~ 55HRC. SKF bearings found in production, often SKF bearings burned, seriously affecting the production and SKF Bearing induction hardened workpiece quality. Inspection found, SKF bearings burned area are located in the induction coil 225. Around the site, was extended to both sides of regularity failure characteristics.
     When heating the sensor axle, the heat generated by the induction heating of the workpiece in addition, the heat loss, there are three main ways.
     (1) to the surrounding radiation heat. Rehouse magnetic conductor, insulating paint and glass cloth, etc. on an induction loop. This form less heat loss and heat evenly, has little effect on the sensor burnout.
     (2) the cooling water heat. This part of the heat to cool the induction device, the induction heating safely. It was found that the intake between 0-180 degrees, the water temperature is low, indicating good heat exchange cooling water, the water smooth, the water temperature is not; over 180. Later, due to the length of the flow path, the larger the temperature increased, the temperature rise of the heat exchange variation, could easily lead to some parts of the sensor thereafter (eg, about 225. Zone) temperature rise, which is the main reason for the induction coil to burn out.
     (3) the induction coil to heat conduction plate pieces, parts of the current density plate, cut through a large area of ??water, so the water temperature in the region is low, so that the heat conduction to the plate at an induction loop. From 0 to 90 degrees and 270-360 degrees from the connecting plate portion near the induction coil, the thermal conductivity is good; 270 and induction coil 90 to the connecting plate portion distant from, poor thermal conductivity, so that the induction coil temperature greater area easy to appear in this section of the induction coil burnout phenomenon. Comparison of the heat flow to different parts of the induction coil. Induction loop region in the vicinity of 225 degrees of heat conduction savings large and poor, and therefore prone to the site of the induction coil burnout phenomenon.

NSK Bearings quality super good, so manufacturing is also very troublesome. NSK Bearings many manufacturers are not manufacturing, only to please professional manufacturing technicians will produce NSK Bearings craft.
    According to the different parts of NSK Bearings chemical composition, shape, dimensions and mechanical properties of the design requirements, using different quenching methods, each of which has its NSK Bearings steel fixed curve C, the cooling medium determines the microstructure after quenching microstructure and mechanical properties, and therefore must focus on specific analysis, in fact, for many parts of the heat treatment of NSK Bearings defect generation and cooling NSK Bearings media has a direct relationship, but also with the specific operation concerned.
    Heating the workpiece in the heat treatment furnace to fully austenitic, to obtain the desired microstructure and properties, the need for quenching. After cooling the workpiece to be martensite, the cooling rate must be greater than the critical cooling rate, but the cooling rate is too fast to make the workpiece volume shrinkage and dramatic changes in the organization, causing great stress. Therefore, the condition of martensite as the cooling rate should be low while the ideal cooling curve shown.
    Select the appropriate quenching medium significantly more important, it determines the microstructure and properties of NSK bearings imported parts after quenching, quenching medium usually have solid, liquid and gas in three, according to NSK Bearings quenching medium when the change of state is divided into fat bio state changes and not made changes in biological state class.