Grinding problems of Grinding Wheel
Grinding problems occur in two ways: the appearance of the workpiece and the cost or productivity issues. After confirming that the 10 grinding wheel is not faulty, turn your attention to the grinding wheel.
Appearance problems are classified into poor surface finish, tremor and charring. The cost and productivity problem is that the 10 grinding wheel has a short life, slow cutting and the inability of the wheel to cut.
- Exterior Problems
- Bad completion
Grinding is a multi-point cutting process, but at the micro level it is almost the same as a single point operation such as turning. In this way, it is easy to see the effect of the same factors on the surface finish: the more material removed per grinding point, the larger the individual chips and the rougher the surface.
The solution is:
Choose a finer granularity
Reduce the relative speed of the grinding wheel and the workpiece
In the case of wet grinding, it is also possible that the coolant does not remove chips from the workpiece/grinding wheel interface. The 3m grinding wheel may also be over-trimmed and the resulting grinding points are too prominent on the surface of the grinding wheel.
Chatter
It can be identified by a unique pattern on the workpiece and is usually audible and there are many reasons for the tremor. If it is caused by vibration in the machine (which may be some kind of resonance), then the solution is to change the grinding speed. Try to slow down by 10% to eliminate forced motivation.
When an incorrect Cutting wheel acts as an excitation source, chattering caused by the grinding wheel occurs. In this case, the wheel should be carefully corrected. Also check that it is not slipping on the mount. A detailed discussion of chattering can be found on the Abrasive Engineering Society website.
Burning
The term used by the mechanic to indicate thermal damage. The range may vary from appearance to change in hardness of the workpiece, and may even cause internal tensile stress caused by deformation. Burning is more common in dry grinding, but if there is not enough coolant to remove heat, wet grinding will still occur. The “Burn Awareness” in the “Cutting Tool Engineering”, originally published in December 2000, provides more information.
If the hub is glazed or loaded with glass, it may burn, so attempting to push the hub into the workpiece too quickly or using a hub that is too durable will create more friction and therefore greater friction.
The solution is:
Trimming the 10 grinding wheel with a trimming rod
Reduce the feed rate or the relative speed between the grinding wheel and the workpiece.
Cost and productivity issues：
Wheel life is too short
This may be due to:
- Insufficient coolant
- Dressing too often
- A grinding wheel that is too hard or too soft for the workpiece (hence, the wheel is loaded or worn too fast)
- Sending wheel speed is too low
Slow cut
Usually due to feed and / or grinding wheel speed is too low, the solution is to grind as fast as possible without burning.
The grinding disc is not cut
This happens when the wheel is glazed due to trimming. The solution is to gently dress 3m grinding wheel until the sand is open.
Logical thinking
Most grinding wheel related grinding problems can be solved by linking faults to the basic principles. The picture material is removed by each cut point and a solution usually occurs.