The reason for the shaking of the guide wheel

The guide wheel of the centerless grinder does not have a grinding effect, but only provides positioning and grinding rotation motion for the workpiece. Through grinding, an axial motion must also be given to the workpiece. If the workpiece is not ground well, the shape of the guide wheel has a certain relationship. During operation, we may find that the guide wheel shakes severely. This situation is generally caused by the following reasons.

It is a centerless grinder with a frequency converter drive structure. In terms of operation, this structure may cause the guide wheel to shake when the frequency converter is out of phase or the frequency converter module is burnt out. This kind of shaking is usually displayed under stress, and sometimes a knocking sound is emitted at the worm gear, which can easily be mistaken as a problem with the worm gear. The structure of the gearbox's centerless grinder is relatively complex, and the centerless grinder is mainly caused by the wear and clearance of the main shaft, sprocket, chain, strut, gearbox bearings, and various transmission mechanism components, as well as the adjustment of the bearing clearance when the clearance is too tight. It also displays more clearly at low speeds and under stress. Bringing great inconvenience and quality decline to production.

When the guide wheel of the centerless grinder shakes, check these aspects. If it is not a problem, you can consult an experienced master for handling.

Precautions for installation of centerless grinding wheel

After using the centerless grinder for a period of time, if the grinding wheel wears out and cannot be repaired, a new grinding wheel needs to be replaced, otherwise it will affect the machining quality of the workpiece. The centerless grinder grinding wheel is fixed by a grinding wheel chuck, relying on a cone sleeve and a chuck cover to clamp the grinding wheel in the middle. A layer of paper pad or oil resistant rubber of more than 1 millimeter must be placed between the grinding wheel and the chuck end face. Make the pressure evenly distributed, and the tightening force of the hexagon socket screw should not be too large, otherwise the grinding wheel is prone to breakage.

Due to the heavy weight of the grinding wheel in the centerless grinder, two static or dynamic balance tests must be conducted to adjust the new grinding wheel after installation. If it is unbalanced, the grinding wheel will produce vibration during high-speed operation, which will affect the machining accuracy. Dynamic balancing requires the use of a dynamic balancing instrument, while static balancing requires the use of a balancing frame and balancing spindle.

Dynamic balancing is measured using instruments, which I won't introduce here. Generally, for static balancing, newly purchased machine tools come with a set. The balancing spindle is placed in the conical sleeve of the newly installed grinding wheel's chuck, fixed with a nut, and then placed together on a flat frame. Several balancing blocks are installed in the annular groove of the grinding wheel chuck, and the center of gravity of the grinding wheel is aligned with its axis of rotation by adjusting the position of the balancing blocks. Then install the centerless grinder onto the machine tool, use a grinding wheel dresser to round the grinding wheel, and place the grinding wheel back on the balance frame. Balance again according to the above method. Finally, it was installed back onto the machine tool, which is considered complete. Attention when doing cutting and grinding, make sure that the outer end face of the grinding wheel is flush with the outer end face of the guide wheel. If it doesn't work, you need to adjust the gasket to make its end face flush.