1. Edge quality issues
Broken edge/corner drop
Reason: Improper selection of particle size (e.g. coarse particle size for thin glass), uneven distribution of grinding amount (excessive grinding amount of grinding wheel No. 1), insufficient cooling leading to thermal stress cracks.
Solution:
Adapt particle size (100/140 mesh for 5-6mm glass, 80/140 mesh for 8-25mm);
Adjust the grinding amount ratio of No. 1/2 grinding wheel to ensure that the grinding marks of No. 1 wheel are completely covered by No. 2 wheel;
Cooling water pressure ≥0.6MPa, sufficient flow.
Grinding wheel mark/scratches
Reason: Residual burrs on the edge, grinding wheel blockage or mixing of coarse diamond particles.
Solution:
Add 20000 mesh fine polishing to remove burrs;
Clean the surface of the grinding wheel and replace the plating solution containing impurities.
Blade blunting (polishing effect)
Reason: Too low pressure, mismatched speed or too high carcass hardness.
Solution: Increase drilling pressure and reduce speed, or replace a soft carcass grinding wheel.
2. Abnormal grinding wheel shape
1, End face outward tilt (low outside and high inside); The workload on the outside of the front ring is too large, and the rear ring does not contact the workpiece; adjust the motor angle and lock it to balance the grinding amount of the front and rear rings.
2, End face inward tilt (high outside); The front ring is not working, and the inside of the rear ring is overloaded; Correct the motor level and redistribute the grinding amount; 3, Annular depression/base is shiny; Glass hits the outside of the grinding wheel or overloads the grinding; When replacing a new wheel, gradually follow up the grinding amount to avoid direct impact.
Life warning: When the depth of the full gear water outlet groove is 1.5mm, the working layer has been exhausted and needs to be replaced.
️ III. Equipment and cooling failure
Dynamic imbalance and vibration
Manifestations: abnormal noise, decreased processing accuracy.
Handling:
Recalibrate dynamic balance to G6.3 level (residual imbalance ≤ 0.5gmm/kg);
Check bearing lubrication and oil in time.
Cooling failure
Consequences: burnt edge, thermal cracking.
Investigation:
Clean blocked nozzles and inspect solenoid valves/water pumps;
Ensure sufficient water level in the water tank and change water regularly to prevent dust blockage.
IV. Risks of safe operation
Mechanical injury
High-risk operation:
Standing in front (fragments flying and easy to injure the face);
Use grinding wheel for side grinding (low axial strength and easy to break).
Specification: Side operation, wear anti-cut gloves + goggles. Parameters exceeded
Pressure overload: Pressure in the fine grinding stage > 2kg/cm² causes abrasive grains to fall off; Angle deviation: Edge angle error > 5° damages the substrate.
Summary: Key preventive measures
Grit size matching: Select the mesh size according to the glass thickness, and use fine grit (such as W40-W60) for thin glass; Dynamic balancing calibration: A balancing test must be performed after the new wheel is installed; Cooling monitoring: Check the water pressure flow in real time to prevent cooling interruption; Safety position: It is strictly forbidden to operate directly against the grinding wheel axis.
Note: The continuous working temperature of the resin bond grinding wheel must be <180℃, and the metal bond should avoid sudden changes in temperature.
