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Application of the NC machine tool

Digital control of machine tools, NC machine tool ( NC, NumericalControl ), thirty years of general application of mechanical, electrical, hydraulic, pneumatic electromechanical integration products, microelectronics and information technology as a whole, in the modern machine tool production, generally use more electric machine drive, the spindle and feed system respectively by the respective motor to drag. Because the machining range is wide, different parts, different processes, using different cutting tools, machine requirements implementation components with different speed, so the main machine can carry out stepless speed, spindle speed control system generally adopts AC spindle system, along with the development of inverter technology, CNC Machine Tool Spindle AC drag, also can be very good to meet the needs of. The main drive motor drives the main shaft to rotate through a belt drive, or through a belt and spindle box gear (to obtain greater torque to drive the rotation of the spindle ). Due to the spindle motor speed range is wide, and stepless speed regulation, which simplifies the structure of the main axle box teco electric motor ac.

Two requirements of CNC machine tool technology.

1, requirements for the motor

Usually require the use of variable frequency motor, or the general motor and fan motor in low frequency to meet the cooling requirements, and requirements for motor speed range teco dc motor speed control.

2, the frequency converter technology

Low frequency torque requirements

Low frequency ( 1~10Hz ) energy out of 150% rated torque.

Torque dynamic response speed, steady speed precision

Can realize the dynamic response to good effect, on the basis of the change of the load, the variation of the output torque fast response, so as to realize the stable rotating speed.

Stop speed

Usually numerical control machine tool acceleration and deceleration time is relatively short, acceleration time by transducer performance guarantee, deceleration time depends on external resistor braking or braking unit.

High reliability

Inverter fault rate is low, stable and reliable operation

3, the electromagnetic compatibility problem

CNC machine tool for the industrial application environment, requires not only the inverter's own strong anti-interference ability, and can not interfere with peripheral control equipment. The working principle of the inverter output frequency converter, harmonic components must, in use, if improper handling may cause interference with other equipment, equipment is most easily in NC machine tool interference is CNC controller. Once the CNC controller after disturbance, the system will not work properly. Especially the frequency instruction and operation instruction converter may also be affected by the interference, interference will cause serious frequency instability, inverter fault action. To solve this problem is formulated in frequency converter factory must undergo a rigorous test of the EMC, using EMC test qualified inverter products PC Remote Control.

Three. The system.

To configure.

Converter: a enlightenment GP400 series high performance vector -7.5KW

Braking resistor: 8– 0Ω /750W

7.5KW variable frequency adjustable speed motor
PR

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