I. Overview
CNC engraving machines are now widely used in various industries, especially in advertising production, architectural decoration, and stone processing. Currently, most CNC engraving machine tools use continuously variable transmission (CVT) systems, which mainly include frequency converter spindle systems and servo spindle systems, generally using DC or AC spindle motors. The spindle is driven by a transmission belt, or by a transmission belt and reduction gears within the spindle box (to obtain greater torque). Because the spindle motor has a wide speed range and can be steplessly adjusted, the structure of the spindle box is greatly simplified. Currently, frequency converters are widely used in machine tools due to their high cost-effectiveness. Weichuang AC80C series frequency converters, with their unique performance and superior cost-effectiveness, are rapidly gaining popularity in CNC machine tool applications.
II. Technological Requirements for CNC Engraving Machines
Modern mainstream CNC engraving machines consist of three main parts: a computer, an engraving machine controller, and the engraving machine body. Their operation...
The principle is to design and layout the pattern using specialized engraving software configured within a computer, and then use the computer to process the design and layout.
The information is transmitted to the engraving machine controller, which then converts this information into pulses that can drive the stepper motor or servo motor.
The impulse signal controls the X, Y, and Z axes of the engraving machine for tool positioning. Simultaneously, the controller activates the frequency converter, driving...
The high-speed rotation of the engraving head by the spindle motor cuts and mills the material fixed on the main machine's worktable, thus creating the engraving.
It can carve various two-dimensional or three-dimensional relief graphics and text designed in the computer, realizing automated carving operations, according to different...
Depending on the material and process requirements, different specialized cutting tools can be used.
III. Weichuang Solutions
Using the Weichuang AC80C series frequency converter, the following methods are employed for control.
(1) The control mode is selected as V/F control.
(2) Terminal control is required as the command source. Two-wire terminal control: FWD is for forward rotation.
Run, REV reverses the run.
(3) The frequency source is set to analog (computer control board outputs 0-10VDC), only
Frequency commands need to be input from the VS port.
(4) The operating speed is generally between 0 and 24,000 r/min. Convert the operating frequency of the frequency converter.
The frequency range is 0-400Hz (two-stage high-speed motor).
(5) Acceleration and deceleration times are generally 3-5 seconds, depending on the customer's needs.
The speed of the line is relatively high, so a frequency converter with a braking unit is required.
(6) A fault output signal (OC output or relay output) and a fault reset signal (RST input) are required.
IV. Conclusion
The CNC engraving machine system powered by Weichuang frequency converters operates smoothly and reliably throughout its operation, bringing significant economic benefits to the company. Through actual production testing, the client is highly satisfied with Weichuang's overall solution. Its advantages are mainly reflected in the following aspects:
(1) Small speed fluctuations across the entire speed range.
(2) The torque is large at low speeds, which can ensure low-speed cutting.
(3) The acceleration and deceleration time can be very short.
(4) It ensures that the temperature rise of the motor is very low when it runs at high speed.
