The spindle is the power auxiliary device of CNC machining center. The spindle drives the workpiece to rotate, which is used to process the workpiece of revolving body. Spindle is an important guarantee for high-speed and high-precision machining of CNC machining center, so the maintenance methods and skills of spindle failure are the basic knowledge that operators and maintenance personnel of CNC machining center must master. When operating CNC machining center, the spindle will inevitably have some faults. What are the specific reasons?
Different types of CNC machining centers adopt different types of spindles. According to the different transmission systems, the spindle system can be divided into the main drive spindle with variable speed gear, the main transmission spindle through belt drive, the spindle driven by dual motors and the spindle integrated by motor and spindle. No matter what type of spindle application, the common faults in use are as follows:
1. Overload.
Fault causes: excessive cutting amount, frequent positive and negative rotation, spindle motor failure, spindle drive device failure.
2. The spindle does not rotate
Fault causes: spindle drive device failure, CNC device can not output speed signal, spindle motor fault, spindle drive device fault, drive belt fracture.
3. Spindle speed deviates from the command value
Fault causes: motor overload, problems with spindle speed command output from CNC system, fault of speed measuring device or disconnection of speed feedback signal.
4. Abnormal noise and vibration of spindle
CNC machining parts
Fault cause: it usually occurs in the process of deceleration, and the spindle drive device has problems, such as the regeneration circuit fault in AC drive.
CNC machining center spindle abnormal noise is the most operators will encounter things, to understand the cause of the failure, what measures should we take?
When the machining center is in use, customers often find that the main shaft is transmitted by belt. After a long time of use, there will be abnormal noise. When the forward transmission and reverse rotation are switched, there will be noise. According to years of assembly experience, most of the problems are belt, The belt tension at the connection between the servo motor and the spindle is too tight, which causes the belt to slip, and the spindle will make abnormal noise.
There is also a case that the tension of the belt connecting the servo motor is not enough, so the belt of the motor is too loose, which can be seen intuitively. When using the machining center to re chip, there will be slip and abnormal noise. The belt will be worn after the machining center is used for a long time, which is part of the cause of abnormal noise.
After CNC machining center spindle abnormal noise, some economical customers will choose to replace the transmission wallet. After the replacement, the belt drive gear does not match with the tooth type of the motor and the spindle, which can also make do with it. However, there will be a great abnormal noise during the use, which will seriously cause the wear and damage of the gear between the servo motor and the spindle. It is recommended to observe whether the model of the belt purchased and replaced is the same
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