Introduction: Unlike cylindrical grinding machines, centerless grinding machines do not have a head frame and tailstock, but are supported by a bracket and guide wheel to support the workpiece. It is usually composed of three mechanisms: grinding wheel, guide wheel and bracket, the grinding wheel is used to grind the workpiece, the guide wheel is used to support and control the rotation of the workpiece, and the bracket is mainly used to support the workpiece. This article will introduce the relevant content with the jitter of the guide wheel of the centerless grinder.
The guide wheel of the centerless grinding machine does not play much role in grinding the workpiece, and can only be used to position the workpiece and guide the workpiece for rotational movement, and when grinding, it is also necessary to give the workpiece an axial movement. If the grinding of the grinding wheel on the workpiece does not achieve a good process effect, the shape of the guide wheel and the grinding angle have a certain relationship.
When using a centerless grinder to process the outer circle of the workpiece, the quality problem of the workpiece cylindrical abrasion usually occurs continuously, and when the workpiece cylindrical abrasion problem occurs, the operator can not only pay attention to the jitter of the grinding wheel and the adjustment of the grinding machine, but also need to pay attention to the jitter of the guide wheel, because the jitter of the guide wheel of the centerless grinder is also a cause that cannot be ignored in the external cylindrical abrasion of the workpiece.
The guide wheel of the centerless grinder shakes
The influence of the jitter of the guide wheel of the centerless grinder on the processing quality of the workpiece
When the workpiece enters the grinding area of the centerless grinding machine, the workpiece is on the one hand in automatic rotation, and along the X axis direction, if the guide wheel produces jitter at this time, the workpiece will be pushed to the grinding wheel at the moment of shaking, increasing the grinding depth, so that the outer circle of the workpiece has scars. In addition, because the support surface of the bracket is generally inclined, the jitter of the guide wheel in addition to causing the workpiece to move towards the grinding wheel in the Y axis direction will also make the workpiece move in the vertical direction, raise the center of gravity of the workpiece upwards, and increase the difficulty of processing the workpiece into a circle.
When processing bearing rings, the impact of the workpiece at the outlet and the impact of the guide wheel jitter at the inlet are basically the same, the difference is that when the workpiece is at the outlet, the workpiece at this time has not touched the grinding wheel, but the workpiece is still rotated under the action of the guide wheel, when the workpiece is separated from the guide wheel, the guide wheel just produces jitter, which may tilt the workpiece. At the rear bracket, if a certain point of the workpiece is under the force of the Y axis direction, another point will contact the grinding wheel, and the part of the wear is only at the contour line and chamfer where the outer diameter of the workpiece intersects with the chamfer, and the workpiece at this time continues to rotate and move in the direction of the X axis, and the wear generated by the grinding wheel will be linear, and the workpiece will continue to move away from the exit after the abrasion.
If the jitter of the guide wheel of the centerless grinding machine is greater, the larger the size of the workpiece moving to the grinding wheel, the deeper the abrasion will be generated. Therefore, the greater the jitter of the guide wheel, the more serious the external cylindrical abrasion of the workpiece.
Solution to the jitter of the guide wheel of the centerless grinder
If the centerless grinder is driven by the frequency converter, the output of the frequency converter is out of phase or the module is burned out, which will cause the phenomenon of guide wheel jitter, and we can let the electrician take the frequency converter down to repair or replace it to solve. If the worm gear is damaged and the guide wheel is shaken, it is recommended to replace it, and the coupling needs to be tightened.
If it is a centerless grinder of the transmission structure, the phenomenon of guide wheel jitter is caused by the damage to the contact surface of each structure, and we need to check it in turn and eliminate the problem place in turn. If the guide wheel spindle has a gap, we can tighten the guide wheel spindle, when tightening the guide wheel spindle, use a dial gauge to resist in the front of the spindle without damage and smoothness, the gap is as small as possible, and it is recommended to be about one micron when rotating.
If the sprocket bore and gear are damaged, it is recommended to replace it. However, the inner hole of the sprocket is damaged, and the inner hole of the sprocket can be thickened by using the argon arc welding method, and then grinded back to the original size sleeve. The sprocket of the spindle will also be damaged, which can be filled with laser welding, and then grinded back to its original size using an external cylindrical grinder. The key tips also need to be repaired and the chains need to be replaced with new ones. If the zipper gear is damaged, it also needs to be replaced, the four small bearings have clearances and need to be replaced, and the tension spring does not have elasticity and also needs to be replaced.
This article briefly introduces the solution of the guide wheel of the centerless grinding machine. In the processing of the centerless grinding machine, the quality problem of the external cylindrical wear of the workpiece usually occurs, in this case, we can not only pay attention to the jitter of the grinding wheel and the adjustment of the grinding machine, but also need to pay attention to the jitter of the guide wheel, because it will also bring greater inconvenience to the production and processing. Follow Jiezhong Robot to learn more about the knowledge and application of the guide wheel of the centerless grinding machine.
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