CBN grinding wheel applications on Bearing Grinding

The inner surface of the bearing inner ring inner diameter grinding, and other outer ring raceway bearing production has been restricted procedure. Due to the size of the hole bound by grinding wheel size, extension bar, cooling conditions are limited, especially small ball bearing inner ring bore grinding, it is a difficulty bearing grinding, existing production means can not meet the needs of production. CBN grinding wheel with the use of high-power, high-rigidity spindle, greatly improving the cutting performance, reduces wheel wear, making the grinding surface quality, workpiece size, wheel accuracy greatly improved, but also reduces the dressing wheel, replace the wheel and other auxiliary time and improve grinding efficiency. However, when using CBN grinding wheel bearing bore of the bearing grinder and associated facilities proposed new requirements.

(1) Bearing grinder CBN grinder whole process more rigid structure, from the bed to the rigidity of the components are more common grinder demanding to meet the CBN grinding wheel creep feed large depth of cut requirements. Assume primary grinding wheel movement motor spindle requires ultra-high-power, high rigidity and long life, so that high speed can reliably cut metal margin, and to achieve the required precision. Since the CBN grinding wheel wear rate is very low, the desired amount of dressing is very small, generally bearing grinding trim amount only 3-4 microns, which requires machine feeding and finishing systems have minimal feed override resolution , usually 0.5 to 1 micrometer feed, compensate rail speed feed, without creeping phenomenon can not deform under stress. CBN Dresser use of a cup diamond dresser, also called wire-speed grinding wheel and the dresser there is a certain linear velocity ratio, which requires electric power inverter driven spindle able to adapt control.

(2) grinding CBN grinding wheel using cooling oil cooling better than water cooling, because water and CBN abrasive grinding adverse reactions occur affinity. Using high-pressure flow of oil cooling, supporting the need to suck the fog device.

(3) electrical control in electrical control, grinding parameters adjusted for grinding station manager is also very important. CBN grinding wheel after early repair, there is a period of instability, then the machine should be adjusted to reduce the feed rate, the control system requires the use of CNC controls and the ability to adapt to random control.

(4) wheel dressing CBN grinding wheel wear rate is much smaller than the corundum wheel class. CBN grinding wheel wear is generally considered the main form of chemical wear, abrasive wear and shedding phase transition caused by blockage or the like. Jing vitrified bonded CBN wheel commonly used stone dresser diamond wheel dresser (commonly used in the molding surface finishing), IF diamond disk drive cartridge dresser and so on. Wherein a simple single-point diamond dresser, inexpensive, but the diamond easy to wear, poor repair sharp results in severe crushing wheel; pneumatic cup-shaped diamond dresser, dressing, dressing the best, diamond wear uniform, but the speed of the dresser is not easy to align. Structure is slightly complicated; midrange driver diamond disc dresser dresser element adjustable speed, you can choose the most suitable dresser and wheel speed ratio. Trimming effect is quite satisfactory, diamond wear uniform, is more senior dresser, but its structure is more complex, driven by the need dresser power inverter. Other finishing methods include elastic bending trimming device, a wire brush in combination with the diamond grinding wheel dressing method, free abrasive grinding block auxiliary dressing method and electrolytic dressing online technology.

(5) the effect of the application of high-speed CBN grinding wheel bearing inner circle, the grinding ratio, dimensional accuracy and surface roughness geometric aluminum oxide grinding wheel has improved greatly. Reducing the auxiliary time, improve productivity, enabling unmanned production management. Plain bearing is a low-value-added products, in the promotion of the use of CBN grinding wheel, careful study of the use of rational grinding ratio, so as to solidly promotion and use of this advanced method of grinding.

Although the CBN wheel cost performance Not many bearing manufacturers accepted, plus the country is still Good for CBN grinding wheel excellent performance of the machine, but with the further decline further study of domestic CBN grinding wheel, and the cost of master special machine tools research and development and other related technologies, CBN grinding wheel bearing will be widely used in grinding.

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