Lathe spindle maintenance, lathe spindle bearing adjustment method

Bearing wear causes clearance, and then produces runout and other phenomena, the traditional method of disassembling and repairing the brush plating or replacing the bearing, but the shortcomings are more obvious, the thermal stress of the repair welding, the pollution of the brush plating, and the energy and cost of disassembly and replacement. The more advanced and practical method is to apply polymer composite materials, which have a certain cushioning effect, which can well absorb the impact vibration of the equipment and avoid secondary wear. And there is no need to disassemble, it occupies a large proportion in contemporary maintenance, referring to the Fushi blue metal repair 2211F series, and the application effect is better.

Generally, there is a gap between the front and rear bearings of the spindle. Disassemble and replace the bearing.

The main thing is that the bearings are empty. Or maybe it's loose.

Spindle bearings are worn'Just replace the spindle bearing.

The error of the spindle runout is mainly caused by the wear of the axle shoulder and taper hole after the machine tool is used for a long time, and the noise is caused by the accuracy of the assembly and the accuracy of the gear transmission. The spindle itself is noise-free.

Summary. Pro, 1 Adjust the gasket method: fill a group of soft material (mild steel sheet or elastic paper) gasket between the bearing end cover and the end face of the bearing seat; When adjusting, first install the bearing end cover without putting the gasket, tighten the screws on the bearing end cover evenly on one side, and rotate the shaft by hand on the other side until the bearing rolling element is in contact with the outer ring and there is no clearance inside the shaft; At this time, the clearance between the bearing end cover and the end face of the bearing seat is measured, plus the axial clearance required by the bearing in normal operation; This is the total thickness of the gasket that needs to be placed, then the prepared spacer is placed between the bearing end cap and the housing end face, and finally the screw is tightened.

Pro, 1 Adjust the gasket method: fill a group of soft material (mild steel sheet or elastic paper) gasket between the bearing end cover and the end face of the bearing seat; When adjusting, first install the bearing end cover without putting the gasket, tighten the screws on the bearing end cover evenly on one side, and rotate the shaft by hand on the other side until the bearing rolling element is in contact with the outer ring and there is no clearance inside the shaft; At this time, the clearance between the bearing end cover and the end face of the bearing seat is measured, plus the axial clearance required by the bearing in normal operation; This is the total thickness of the gasket that needs to be placed, then the prepared spacer is placed between the bearing end cap and the housing end face, and finally the screw is tightened.

2. Adjustment bolt method: press the pressure ring on the outer ring of the bearing, and pressurize it with the adjustment bolt; Before pressurizing the adjustment, the pitch of the adjustment bolt should be measured first, and then the adjustment bolt should be slowly tightened until there is no clearance inside the bearing, and then the corresponding rotation angle of the adjustment bolt should be calculated. For example, the pitch is, the clearance required for the normal operation of the bearing, then the rotation angle required to adjust the bolt is 3600; At this time, the adjusting bolt is reversed 360, and the axial clearance obtained by the bearing is fixed, and then it can be fixed with a stop gasket.

1.Spindle heating: bearing damage or unclean, bearing grease exhaustion or excessive grease, bearing clearance is too small;

2.The belt of the motor and the spindle drive is too loose, there is oil on the surface of the belt, and the clutch is loose;

The spindle without frequency conversion does not rotate 1) Handling method caused by mechanical transmission failure: check the CNC lathe.

Whether the belt drive is broken or whether the machine tool is in neutral. 2) The three-phase power supply to the spindle is out of phase or reversed phase treatment method: check the power supply and replace any two power lines.

with a multimeter. If there is no spindle control signal output, the relevant IC components need to be replaced or sent to the factory for maintenance. 5) The system has the corresponding spindle signal output, but there is an open circuit or component damage in the power supply line and the control signal output line: check the power supply circuit between the system and the spindle motor with a multimeter, and whether there is an open circuit in the signal control loop; Whether the contacts of each connection are not in good contact; AC contactors.

The DC relay is not damaged; Check the thermal relays.

Whether it is overcurrent; Check if the insurance is burned out, etc. 2. The spindle with inverter does not rotate 1) The treatment method caused by the transmission of the machine chopping machine: check whether the belt drive is broken or whether the machine tool is in neutral gear.

2) The three-phase power supply to the spindle is out of phase treatment: check the power supply and replace the two power lines. 3) The control parameters of the inverter of the control system are not opened

Consult the data sheet to understand the frequency conversion parameters and change them. 4) How to deal with the error of the line connection between the system and the inverter: check the connection manual of the system and the inverter to ensure that the connection is correct.

5) Abnormal analog voltage output treatment method: check whether the analog voltage of the system is normal with the table, check whether the analog voltage signal line connection is correct or poor contact, and whether the analog voltage received by frequency conversion is matched. 6) Handling method of strong current control part open circuit or component damage:

Check whether the contact connection of the spindle power supply line is reliable, whether the line is broken, whether the DC relay is damaged, and whether the fuse is burned out.

The spindle of the machine tool spindle bearing is selected as the key component of the machine tool, and its performance will directly affect the parameters of the machine tool, such as rotation accuracy, speed, rigidity, temperature rise and noise, and then affect the processing quality of the workpiece. In order to maintain excellent machine tool processing capacity, it is necessary to use high-performance imported bearings. The reasonable selection of spindle bearings for the bearing accuracy on the spindle of machine tools should be ISOP5 or above (P5 or P4 is the accuracy level of ISO, usually P0, P6, P5, P4, P2 from low to high), and for the spindle support of high-speed and high-precision machine tools such as CNC machine tools and machining centers, ISOP4 or above accuracy level is required.

Spindle bearings include angular contact ball bearings, tapered roller bearings, and cylindrical roller bearings.

It is recommended that you go to a professional machine tool manufacturer to consult.