The grinding machine which uses centerless grinding method to grind the rotating surface of workpiece is usually referred to as centerless cylindrical grinder. In centerless cylindrical grinder, the workpiece is not centered and supported by the center, but placed between the grinding wheel and the guide wheel, supported by the supporting plate and guide wheel. Generally, the grinding wheel is installed at the end of the spindle, and the grinding wheel with width greater than 250 mm is installed in the middle of the spindle, and the maximum width of the grinding wheel can reach 900 mm. The grinding wheel rotates at a high speed, and the guide wheel rotates in the same direction at a slow speed to drive the workpiece to rotate for circular feed.
In the process of through grinding, the axial feed is realized by adjusting the small inclined angle of the guide wheel axis, which is suitable for grinding slender cylindrical workpiece, short shaft without central hole and sleeve type workpiece. In cut in grinding, radial feed is realized by the movement of guide wheel frame or grinding wheel carrier. It is suitable for grinding workpieces with shoulder or boss, as well as workpieces with cone, sphere or other lines being curved. The productivity of centerless grinder is high, and it is easy to realize automation after various loading and unloading devices. Most of them are used in mass production and can be operated by unskilled workers. The grinding accuracy of centerless grinder is generally 2 μ m in roundness and 4 μ m in size. High precision centerless grinder can reach 0.5 μ m and 2 μ m respectively. In addition, there are centerless internal grinder and centerless thread grinder.
The centerless grinder can repair and compensate automatically. The guide wheel feed guide rail is double V-shaped needle roller guide wheel, which is fed by servo motor and can compensate each other with grinding wheel dressing. The machine tool is equipped with automatic loading and unloading mechanism, which can carry out automatic cycle grinding.
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