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How a centerless grinder works

2018-08-07 03:03:27 PM

Centerless grinding machines Grinding machines that use the centerless grinding method to grind the rotating surface of a workpiece are usually referred to as centerless cylindrical grinding machines. On a centerless cylindrical grinder (see picture), the workpiece is not centered and supported, but is placed between the grinding wheel and the guide wheel, and is supported by the pallet and the guide wheel.

Grinding wheels are generally installed at the end of the main shaft, and wheels with a width greater than 250 mm are installed in the middle of the main shaft. The width of the grinding wheel can reach 900 mm.

The grinding wheel rotates at a high speed for grinding, and the guide wheel rotates in the same direction at a slower speed, which drives the workpiece to rotate for circumferential feed. During through-grinding, the axial feed is realized by adjusting the slight tilt angle of the guide wheel axis, which is suitable for grinding slender cylindrical workpieces, non-porous short shafts and sleeve-type workpieces.

During plunge grinding, radial feed is achieved by the movement of the guide wheel or the wheel carrier, which is suitable for grinding workpieces with shoulders or bosses, and cones, spheres, or other workpieces whose curves are curved.
Centerless grinders have high productivity and are easy to automate after adding various loading and unloading devices. They are mostly used for mass production and can be operated by less skilled workers.

The grinding accuracy of centerless grinders is generally: roundness of 2 microns, dimensional accuracy of 4 microns, and high-precision centerless grinders can reach 0.5 microns and 2 microns, respectively.

There are also centerless internal grinders and centerless thread grinders. Centerless grinders can be automatically trimmed and compensated. The guide wheel feed guide is a double V-shaped needle guide wheel, which is fed by a servo motor, which can compensate each other for the grinding wheel dressing. The machine is equipped with an automatic loading and unloading mechanism, which can perform automatic cycle grinding.