Application of CNC system in modern manufacturing workshop (2)

It uses two Intel processors to communicate with each other via a PCI-PCI bridge. One processor is responsible for numerical control operations (NC computers) and the other is used as a human interface computer. An NCCPU card and an NC machine card are inserted in the NC computer. The NC machine card is connected to the CNC drive and communicates with the HMI computer via two bus cards with PCI bridges. The internal bus card of the HMI computer is connected to the control panel of the CNC system and the external interface. The CPU card of the HMI computer controls the touch LCD display as well as computer peripherals and network communications.

The traditional numerical control system converts the digital signal of the programming system into a voltage analog signal, and then controls the speed of the driving motor by the magnitude of the voltage. In fact, it is still analog control.

The biggest feature of the new generation CNC system is the serial real-time communication interface SERCOS and pico-level interpolation technology. It integrates position control, speed control, precision interpolation, and servo motor control in one integrated circuit. The digital servo drive technology connects the numerical control system and the servo controller with optical fibers by means of the SERCOS interface, which greatly improves the transmission rate and response speed of the system, and can reach nanoseconds.

The performance of CNC system and the improvement of machining accuracy and efficiency of CNC machine tools are inseparable from the accuracy of interpolation. After using SERCOS interface technology, Andron developed a pico-level interpolation technique to increase the interpolation accuracy from 1×10-7m to 0.6×10-12m.

The higher the interpolation accuracy, the higher the dimensional accuracy of the machined parts. The smaller the surface roughness, the smoother the machine tool movement and the smaller the tool wear, which further reduces the machining cost.

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