The application of Tenglong converter in CNC machine tools
Due to the complex production process of modern CNC machine tools, different processes and cutting speeds, traditional driving methods cannot meet current processing requirements. The application of frequency converters has made it possible to achieve a wide range of speed control, which can not only provide stepless speed regulation, but also simplify the structure of the headstock and reduce the use of space. In addition, it can achieve high-efficiency, energy-saving and environmental-friendly effects, increase production and economic benefits.
Requirements of Application Technology for CNC Machine Tools
1, the motor requirements:
Usually requires the use of variable frequency motor, or ordinary motor plus fan to meet the motor cooling requirements at low frequencies, and requires a wide range of motor speed.
2nd, frequency changer technical requirement:
1) It is required that the low-frequency torque is large and the vector inverter is used. At low frequency (1 to 10 Hz), 150% of rated torque can be output.
2) Vector converter's torque dynamic response speed, steady speed and high accuracy. When the load is changed, a quick response is made by the change in the output torque so that the speed of the shaft is stabilized.
3) The deceleration and stop speed is fast. Generally, the acceleration and deceleration time of the CNC machine tool is relatively short. The acceleration time depends on the performance of the inverter, and the deceleration time depends on the external braking resistor or braking unit.
4) The use of Tenglong VG3000 series vector inverters, in order to achieve good control performance, usually requires self-learning of the motor parameters, its purpose is to obtain accurate motor internal parameters for vector control calculations. The motor nameplate parameters required for parameter self-learning are: motor rated power, motor rated frequency, motor rated speed, rated motor voltage, rated motor current. When performing parameter self-learning, be sure to do it when no load (load on the motor shaft is not connected). The accuracy of self-learned motor parameters can only be guaranteed when unloaded.
5) Frequency command and operation command. The frequency command and the operation command of the frequency converter used on the CNC machine tool are all from the CNC system. Generally given is the analog input or multi-speed reference, or both. Multi-speed priority. The analog input is mainly voltage analog and current type. The frequency converter can collect these two types of analog quantities.
3, anti-jamming problem:
Tenglong inverter has made a good anti-jamming test before leaving the factory. It has strong anti-jamming capability, but the inverter is also a source of interference. The most easily disturbed equipment on CNC machine tools is the CNC system. Once the CNC system is disturbed, it will not work properly. In particular, the inverter frequency command and operation instruction may also be affected. Severe disturbances may cause frequency command instability and inverter malfunction. The solution to this problem is to add a magnetic ring to the output line of the inverter to reduce high-frequency radiation or ground.
The following is an example of the application of the Tenglong VG3000 series of high-performance vector inverters in CNC machine tools:
5.5kW CNC Lathe Motor Parameters: 5.5kw Variable Frequency Motor
Rated power: 5.5kW Rated frequency: 50Hz
Rated voltage: 380V Rated current: 11A
Rated speed: 1440r/min Mechanical transmission ratio: 2:1
Braking resistor: 120Ω/700W
Workpiece diameter: Φ80mm
Processing Material: 45# Steel
Actual test results: feed performance and speed performance
1, spindle speed: 60r/min (frequency converter operating frequency 4Hz)
2, cutting depth (unilateral cutting): 4.5mm
3, feed rate: 12.6
4, up / down time: 2.5 seconds (0 ~ 153.5Hz)
Tamron VG3000 series inverter features:
Tenglong VG3000 series high-performance vector inverter adopts advanced vector control technology. The motor has large torque at low speed, high speed accuracy, reasonable price and complete functions. It has the function of instantaneous power failure and speed tracking and restart to ensure the system to achieve continuous operation mechanism. In order to ensure that the motor operates in the highest efficiency state, therefore, the Tenglong VG3000 series high-performance vector inverter replaces the spindle AC servo system, which is the best choice for the machine tool industry.
Tamron VG3000 series inverter has the following features:
1) The use of advanced vector control algorithms to achieve a true sensorless vector control, in the control performance than the traditional V / F control mode has greatly improved;
2) Large starting torque, 0.5Hz/150%,
3) Carrier frequency range 0 ~ 15KHz; adaptive adjustment according to temperature and load characteristics;
4) Provides a standard 0 to 10V analog interface that is compatible with most CNC system interfaces and has high versatility;
5) Strong overload capacity, 150% of rated output current for one minute;
6) Provide multi-functional output terminal signals, such as fault output signal, running signal, speed arrival and other output signals, which can well meet the system's monitoring of the spindle speed status;
It turns out that using the Dragon VG3000 series of high-performance vector inverters can fully meet the requirements of the spindle control of the machine tool. Even under low-speed (low-frequency) operation, it can smoothly output 150% of the torque to meet the processing needs of different parts (rough processing, Finishing) to achieve different speeds, but also improve the accuracy and efficiency of automated processing and extend the life of the tool. Tenglong VG3000 series inverters are characterized by their unique features (small starting current, smooth speed regulation, large speed range, energy saving and environmental protection, stable operation, high precision, low-frequency torque, complete protection functions, high reliability, easy operation and maintenance, etc. ) And superior cost-performance, in the application of CNC machine tools to be recognized.
