The most precise part of CNC machine tool is the spindle, and the abnormal sound and vibration of the spindle are probably caused by the deformation of the spindle.
What is the reason why the spindle of CNC machine tool does not turn? I met that one, too. The headstock is very hot. Just come on. If the motor is still rotating, check the belt and electrical appliances. I hope I can help you!
What is the reason for the noise of the ball screw pair of CNC machine tools? There are five reasons for the noise generated by the ball screw pair and the elimination methods:
(1) The ball of the ball screw pair is damaged. Elimination method: change a new ball.
(2) The lead screw is poorly lubricated. Elimination method: improve the lubrication conditions to make the amount of lubricating oil sufficient.
(3) The spiral support bearing may be damaged. Troubleshooting: Replace the damaged bearing.
(4) The motor and screw coupling are loose. Troubleshooting: Tighten the locking screw of the coupling.
(5) The gland of the spiral support bearing is not tightly pressed. Elimination method: adjust the bearing gland to press the outer raceway of the bearing end face.
What is the reason for the heating of the spindle of CNC machine tools? This is caused by bearing friction, hot weather and high speed, or it may be a hardware problem.
What is the reason why the spindle of CNC machine tool has no speed change? Cause of failure: whether the electric shift signal is output; Whether the pressure is enough; The shift hydraulic cylinder is damaged or stuck; The shift solenoid valve is stuck; The shift fork of the shift hydraulic cylinder falls off; Oil leakage or internal leakage of shift hydraulic cylinder; The shift compound switch is faulty.
Elimination method: maintenance personnel check and handle; Detect and adjust the working pressure; Trim burr and grinding damage, and reinstall after cleaning; Detect and clean the solenoid valve; Repair or replace sealing ring and switch.
There are several methods to change the spindle speed of CNC machine tools, such as stepless speed change, segmented stepless speed change and built-in motor speed change.
(1) The connection form of stepless speed change with constant transmission ratio.
On small CNC machine tools, the main motor and spindle are usually connected in the form of fixed transmission ratio or directly. In order to reduce noise and vibration, when using fixed transmission ratio, V-belt or synchronous belt transmission is usually adopted. The direct connection between the motor and the spindle can greatly simplify the structure of the spindle transmission system and effectively improve the stiffness and reliability of the spindle. However, the output torque, power and constant power range of the spindle depend on the main motor itself, and the heating of the main motor has a certain influence on the spindle accuracy.
1) adopts AC spindle drive system to realize continuously variable transmission. In the early CNC machine tools or large CNC machine tools (spindle power exceeds 100 kW), DC spindle drive system is also used.
2) On the economical and popular CNC machine tools, in order to reduce the cost, the inverter with variable frequency motor or ordinary AC motor can be used to realize stepless speed change.
3) In high-speed machining machine tools, motorized spindle, a new functional component integrating spindle and motor, has been widely used. The motor rotor of the motorized spindle is integrated with the spindle without any transmission parts, which can make the spindle rotate at tens of thousands or even hundreds of thousands of revolutions per minute.
In this transmission system, the spindle motor directly transmits the motion to the spindle through the V-belt or synchronous toothed belt, and the speed change of the spindle is realized through the speed change of the spindle motor. Mainly used in CNC machine tools and small machining centers. This transmission mode can avoid vibration and noise during gear transmission, with simple structure and convenient adjustment and maintenance, but the spindle characteristics are completely determined by the output characteristics of the spindle motor, which puts forward higher requirements for the spindle motor.
Spindle motors used in CNC machine tools include DC spindle servo motors and AC spindle servo motors. DC spindle servo motor is used earlier, and its driving technology is mature and widely used. However, the brush in its structure is easy to be burned by sparks generated during commutation, so it must be maintained regularly. The AC spindle motor is brushless, spark-free, long-lived and easy to maintain, and has become the main driving component of the transmission system of modern CNC machine tools. In addition, mechanical stepless speed change is also rare in the main drive of CNC machine tools. Mechanical stepless speed change devices mostly transmit torque by friction. By changing the transmission radius of driving part and driven part, the constant speed of input shaft is changed into stepless speed change of output shaft within a certain range. The obvious characteristics of mechanical stepless speed change are easy to heat and wear, low transmission efficiency, power below 20k W, and the speed change range is generally 3- 15 r/min. Therefore, it is necessary to add a step-by-step transmission mechanism to meet the use.
What are the possible causes of spindle fever of FAGOT, FADAL and JWK CNC machine tools? Possible reasons are: the spindle is adjusted too tightly, or the spindle bearing is damaged.
The spindle clearance must be adjusted by professionals, because the tightness of cold state and hot state is different.
Generally, the thermal state shall prevail.
If my answer is helpful to you, please adopt it as the best answer in time. Thank you!
What are the causes and elimination methods of noise generated by the spindle box of CNC machine tools? What is this? Check the lubrication, check whether the shaft is loose and whether the bearing is damaged.
Whether the clearance between gears is appropriate, whether the shaft is bent, whether the gears are damaged, etc.
What is the reason for the overload alarm of CNC machine tools? Cause of overload alarm: abnormal machine load leads to motor overload; The spindle rotates forward and backward frequently, the cooling system of the spindle motor is poor, the motor fan inside the spindle motor is damaged, and the spindle motor is disconnected or poorly contacted with the spindle drive device.
What is the reason why the handwheel of CNC machine tool is invalid? 1, MPG key on the machine tool operation panel is not pressed (such as Fanuc). 2. The system does not set the use of handwheels. (for example, a broad number). 3 Handwheel failure.
What is the reason why the spindle speed of CNC machine tools can't be converted? There are several possibilities:
1, itself is a numerical control machine tool, not stepless speed regulation.
2, it is stepless speed regulation. But the gear setting is not appropriate, such as M4 1, M42, M43, M44.
3. You can set the spindle magnification to increase or decrease it.