The following is for“bearingOverheating, abnormal noise, and abnormal vibration? The detailed content framework of the 5-minute quick diagnosis method for common faults in polishing machines, combined with fault symptoms, cause analysis, and quick troubleshooting steps, helps users efficiently locate problems:

1、 Overheating of bearings: the three main culprits behind high temperatures

Phenomenon: When the surface temperature of the bearing exceeds 70 ℃ (cannot be touched by hand for 3 seconds), it is accompanied by discoloration or melting of the lubricating grease.

Quick diagnostic steps:

Check the lubrication status

Observe whether the lubricating grease is dry, contaminated, or overfilled (exceeding 1/2 of the bearing chamber).

Solution: Clean the old grease and refill 2 # or 3 # lithium based grease to 1/3~1/2 volume.

Confirm installation gap

Measure the fit clearance between the bearing and the shaft/seat hole with a feeler gauge, and the standard value is usually 0.01~0.03mm.

Solution: If the clearance is too large, replace the bearing or repair the shaft/seat hole; If it is too small, it needs to be reinstalled or the mating surface needs to be polished.

Detect load and speed

Check if the grinding machine is operating at overload (such as grinding high hardness materials for a long time) or if the speed is too high.

Solution: Reduce the load or adjust the speed to the rated range (refer to the equipment manual).

2、 Abnormal noise: root cause analysis of piercing and buzzing sounds

Phenomenon: Periodic knocking sounds, sharp friction sounds, or low-frequency buzzing sounds occur during operation.

Quick diagnostic steps:

Identify sound types

Knocking sound: It may be damage to the bearing raceway or rollers (such as pitting or cracking).

Friction sound: Insufficient lubrication or seal friction on the shaft neck.

Buzzing sound: Loose bearing cage or excessive clearance.

visual inspection

Remove the bearing and observe whether there are pits, peeling or discoloration on the raceway and roller surface.

Solution: Minor damage can be cleaned and lubricated temporarily for use; Severe damage requires immediate replacement.

Check the seal

Confirm if the sealing ring is aging, deformed, or improperly installed, causing foreign objects to enter.

Solution: Replace the sealing ring and clean the inside of the bearing.

3、 Abnormal vibration: investigation from slight shaking to severe shaking

Phenomenon: Irregular vibrations occur during the operation of the polishing machine, affecting machining accuracy or accompanied by noise.

Quick diagnostic steps:

Basic Inspection

Confirm if the equipment is installed horizontally and if the anchor bolts are loose.

Solution: Adjust the levelness of the equipment and tighten the bolts.

Dynamic balance detection

Measure the vibration value of the bearing seat with a vibration meter (standard ≤ 3.5mm/s), and exceeding the standard may be due to rotor imbalance.

Solution: Perform dynamic balancing correction on the grinding disc (the rotor can be removed and sent to a professional balancing machine for processing).

Measurement of bearing clearance

Measure the radial clearance of the bearing with a dial gauge, and the standard value is usually 0.01~0.05mm.

Solution: If the clearance is too large, the bearing needs to be replaced; If it is too small, it needs to be reinstalled or the preload force adjusted.

4、 5-minute comprehensive diagnosis flowchart

Shutdown inspection: Immediately stop the polishing machine and disconnect the power supply.

Touch perception: Touch the bearing housing with your hand to determine temperature (protective gloves should be worn).

Ear listening judgment: Type of abnormal noise heard near the bearing (knocking/friction/buzzing).

Visual observation: Check the condition of the lubricating grease, the integrity of the seals, and the appearance of the bearings for damage.

Tool assistance: Use a feeler gauge, dial gauge, or vibration gauge to measure clearance/play/vibration values.

Decision processing: Select lubrication, adjustment, replacement, or repair based on the results.

5、 Preventive maintenance recommendations

Regular lubrication: Add lubricating grease every 50 hours of operation and replace thoroughly every 200 hours.

Clean environment: Avoid using in dusty and humid environments, install dust covers.

Standardized operation: Violent start stop is prohibited to avoid overloading or idling.

Spare parts management: Reserve commonly used types of bearings and seals to shorten downtime.

Content highlights:

Time oriented: Emphasize completing preliminary diagnosis within 5 minutes, suitable for rapid on-site response.

Tool universality: Recommend common tools such as feeler gauges and dial indicators to lower the operating threshold.

Combining graphics and text: can be equipped with bearing structure diagrams and comparison diagrams of fault phenomena to enhance intuitiveness.

Through the above steps, users can systematically investigate and troubleshootGrinding machine bearingsMalfunctions, reducing unplanned downtime, and improving equipment reliability.