A CNC double-grinding head grinder can not only grind the outer circle, but also can grind the inner circle and grind the end face. This requires that its supporting numerical control system can complete the work of two or more systems at the same time. Dasen21 is a 4-axis 4-channel nanoscale numerical control system newly developed by Omori Corporation. Each channel is completely independent or part of the channel is strictly synchronized and used to control the dual-channel CNC grinder developed by Wuxi Open Source Machine Tool.
Some of the system's main functions include nano-level high-precision control. The pulse equivalent of the system can be controlled by the actual resolution of the position feedback signal of the servo amplifier or servo motor to ensure high precision control. The minimum resolution is 1 nm. At present, the speed loop and position loop adjustment frequency is set to 1000 Hz, and the next target is 5000 Hz. The main problem that limits the nanoscale control of the system depends on the machine tool.
High frequency and high precision oscillation function. The system's oscillating axis adopts an independent channel, and its oscillation frequency and amplitude are set by parameters. The start and stop of the oscillation axis is controlled by the feed axis channel to ensure synchronization between the feed axis and the oscillation axis. The system has two oscillating axes and two feed axes that can control the simultaneous operation of two grinding heads.
High-speed input trigger function. When the system executes the G31 code, the maximum time from when the input signal is triggered to the system response to immediately execute the next command is 0.5 ms, which guarantees the accuracy of the grinder.
Servo axis dynamic test function. The system can set the acceleration and deceleration values ​​of each axis and the movement mode. It can also set the sampling frequency of the position sensor and illustrate the speed loop error value and the position loop error value in an oscilloscope manner. By optimizing the speed loop and position loop to minimize the error, the parameters can be adjusted to ensure machining accuracy.
Automatic high-density axis error compensation. Each axis of the system can be either a single axis of motion or a compound axis formed with similar inclined axes. Position offset compensation can be performed for each axis at any position. The more points of compensation, the higher the accuracy. In addition, there is no limit to the number of compensation points. The system automatically enters the laser measurement data into the CNC system to automatically form high-density and small-distance position deviation compensation, thereby greatly improving the accuracy of the machine tool.
High-precision full-closed loop feedback function. The system can accept the simulated encoder signal from the servo motor driver to form a semi-closed loop, or it can accept the position signal from the scale to form a full closed loop. It can also accept incremental signals and absolute signals. In addition, the resolution of the position signal can be set to 1 nm by any software.
Special graphics features. The system can both graphically zoom in on the trajectory and continuously zoom in on the screen. 1 mm represents 1 μm to enlarge the results of local processing.