Why does the cylindrical grinder grind the outer groove have chatter marks?

Chatter marks are caused by vibration during the grinding process, so it is necessary to study the relationship between vibration and chatter marks and the causes of vibration.

There are many reasons that affect waviness, mainly depending on the vibration during the grinding process, the greater the vibration force, the greater the amplitude generated. With the increase of amplitude, the waviness value of the waviness also increases, and the waviness value is proportional to the amplitude of the vibrating body.

In the grinding process, the grinding machine mainly produces forced vibration, self-excited vibration and free vibration. The forced vibration accounts for more than 60%, the self-excited vibration accounts for about 30%, and the rest is free vibration.

The solution to the problem of our grinding machine is to use Taiwan grinding wheel dynamic balancer PY2700G, the vibration after each dynamic balance is controlled, and the grinding wheel can be directly processed after sand repair.

The grinding wheel is not sharp, whether the top of the center frame is too loose, the speed of the grinding wheel and the workpiece is not coordinated, whether the vibration of the grinding head is too large or the clearance is too large, check whether the bearing in the grinding head is worn, whether the center of the grinding wheel and the center of the workpiece are the same height, and whether the center of the grinding head and the center of the tailstock (the problem of the same height is generally not easy to appear, if the machine tool takes a long time).

If the grinding wheel is not fast or the top of the workpiece is too loose, if it is not, it means that your grinding head is vibrating too much or the gap is too large.

There is also the grinding too fast;

The grinding machine often has chatter marks when processing, which is a problem that many masters often have, and once the precision grinder produces chatter marks, it will affect the accuracy of the workpiece, so how to solve the chatter marks in the grinder? Let me take you to find out.

1. The grinding wheel itself is unstable, which may be due to the incorrect clamping of the grinding wheel flange or the dynamic balance is not adjusted. This necessitates the installation of new grinding wheels and the balancing.

2. The bearing in the spindle is worn or the bearing is improperly adjusted, which drives the grinding wheel to vibrate. Bearing clearances should be readjusted or bearings replaced.

3. The vibration of other equipment is transmitted to the grinder to cause resonance, and it is necessary to stay away from other vibration sources or dig anti-vibration trenches.

4. Due to the increase of the center height of the skid-supported blade, the blade is not firm and vibrates when the workpiece passes. The screws that hold the blade in place need to be tightened.

5. The grinding wheel spindle is driven by the motor through the V-belt conveyor, and the length of the V-belt is not the same or there is wear, which causes the machine tool to vibrate. Need to check for replacement.

6. The center of the workpiece is too high, and the grinding wheel presses the workpiece to the blade plate through the grinding force, and the component of the guide wheel is reduced, causing uneven force on the workpiece and vibration. At this time, the center height of the blade should be lowered.

Summary. There are two main reasons for the vibration of the cylindrical grinder, or the vibration of the processed parts is relatively large, or the processed parts have vibration marks: 1. First of all, the vibration of the grinding wheel is too large when it rotates at high speed, and the grinding wheel will produce great vibration if it is not dynamically balanced, or it is statically balanced by the grinding wheel balance frame, which cannot meet the requirements of high speed.

2. On the other hand, the vibration of the motor chuck (pulley) is large, and the motor is not balanced or loose, which will also affect the accuracy of grinding wheel grinding.

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The vibration of the cylindrical grinder is relatively large, or the processed parts have vibration marks, and there are two main reasons for the vibration of the grinder: 1. First of all, the vibration of the grinding wheel is too large when it rotates at high speed, and the grinding wheel will produce great vibration if it is not balanced by dynamic grinding, or the bucket is statically balanced by the grinding wheel balance pin stool frame, which cannot meet the requirements of high speed. 2. On the other hand, the vibration of the motor chuck (pulley) is large, and the motor is not balanced or loose, which will also affect the accuracy of grinding wheel grinding.

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There are two main reasons for the vibration marks of the cylindrical grinder, one is that the grinding wheel needs to go through two static balances (preferably dynamic balance), and the other is that the rotor (vibration) of the grinding wheel frame needs to be replaced with a high shaft for dynamic balancing.

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