Engraving machine engraving and milling electromechanical spindle is a kind of high speed and high stiffness precision motor, which is supported by precision rolling bearing, grease lubrication, external circulation water cooling, engraving (milling) spindle is generally used vertically, the use of the correct method will directly affect the quality of engraving and engraving and milling, as well as the working life of the spindle.

1. Avoid collision

Strong impact, especially the spindle end and front end cover parts must not impact, otherwise it will damage the precision of precision bearing and spindle, resulting in the loss of spindle rotation precision.

2. Correct installation and clamping

Before installation, ensure that the spindle motor is in normal state, mainly refers to the appearance of no damage, and the spindle rotation is light and even.With shaking table to check the ground of the stator insulation resistance at 200 м Ω above.Spindle motor and clamping sleeve diameter seat fit tolerance between the holes must ensure that the sleeve of the spindle motor can smoothly into the hole, under no circumstances can use a hammer or other tools to make the spindle positioning, clamping force should not be too big, otherwise it will cause precision bearing steel ball rolling deformation, make the precision of the spindle and life be affected.After clamping, check the spindle front cone hole centering surface beating should not be greater than 0.003mm, spindle rotation light uniform.

3. Installation of cylinder clamps (ER type) pressure caps and cutting tools

The tool must be installed to ensure the accuracy of rotation, or it will produce violent vibration, affect the engraving (milling) quality and efficiency and bearing life.

Must be very careful to clean the cylinder clamps, pressure caps and tools as well as the spindle front taper hole, assembly and disassembly tools should avoid excessive force.

Checking cutting tool root jumping takes less than 0.01mm after assembly. If the deviation is less than 0.01MM, it should be corrected by repeatedly loosening, tightening and adjusting the contact surface of the tool handle. If it is not improved, check whether the contact surface is in normal state.

4. It must be started before

1) confirm the spindle sleeve of circulating cooling water has been required to the opening, the temperature of the cooling water generally not more than 35 ° c, but also shoulds not be too low, should not be directly or move the tap water, because of the water temperature is too low will cause the spindle motor internal hot air cools to form a condensate affect insulation and bearing rust, cooling water flow rate can be in commonly 3-6 l/MIN, cooling water should be clean without bits to prevent clogging the channel.The amount of water in the cooling tank is about 60l-100l. Ab-25 or ab-50 are recommended for the water pump.In and out of the nozzle can't apart too close, it is necessary to make the water in a cooling process in the oven, makes every effort to make the import and export water temperature can reach 2-3 ° c, to avoid the hot water circulation and cooling effect.

2) confirm that the matching relationship between power supply voltage and frequency and the spindle is correct. Set up the U/F curve of the converter according to the corresponding relationship between voltage and frequency provided in the data of the spindle brand or the product test report, ground the no. 4 core of the spindle plug socket, and connect the no. 3.2.1 core to the U V W of the converter.Start should be the first point to check the spindle direction.(from the shaft extension end, the spindle should rotate counterclockwise) if the reverse should be closed, cut off the power supply, any two of the three into the line can be adjusted.

For the newly enabled spindle motor, it is recommended to run at a low speed first. It is recommended to run at half speed for 0.5-2.0 hours before entering high speed.Generally, the spindle motor should be started by means of frequency modulation and voltage regulation.The startup time is about 10 seconds.

5, run,

According to the U/F curve, various speeds can be obtained by adjusting the frequency of the converter.At this point, the inverter voltage will automatically track the adjustment to the desired value.In low speed operation, the voltage can be slightly increased in order to increase the torque appropriately. Generally, it can be controlled that the working current value is close to the rated value (amperes) when the calibration value is about 20% higher.Engraving and milling motorized spindle is not allowed to exceed the speed limit.In a certain output frequency range, may encounter the load device (carving and milling spindle) mechanical common vibration point, resulting in increased noise and vibration, at this time should avoid the frequency of work, noise and vibration can be improved.

Normal operation should do a listen, two touch, three check, and try to avoid sudden brake, tool stuck to the car in time to close.

Listen to - listen to the spindle motor running sound of dry friction and strange sound, found abnormal to close the car in time to check.

Two touch - touch the front cover or sleeve heat and vibration is stable, if the heat and vibration intensified should be closed in time for inspection.(the temperature of the bearing can withstand the < < 140 ° 90 ° c, the stator winding c)

3 check -- check whether the quality of the parts processed is stable, such as the change should be closed in time for inspection.

At the end of each day, the power should be turned off until the spindle stops running, and then the water pump should be turned off to stop the water supply, and the spindle motor should be wiped clean.

6. Maintenance

In normal use, the general operation of about a year, the spindle motor should be disassembled and reassembled for use, so as to ensure the accuracy of the bearing and extend the service life.In order to ensure that the spindle motor can work normally and well, its disassembly and assembly must be carried out by experienced professional operators in a clean environment, as well as the use of appropriate tools, do not knock.Use compressed air to blow away the remaining water in the water chamber for the temporarily unused motorized spindle, and oil the sleeve and shaft head shaft holes to prevent rust and put them in a cool and dry place.