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| The classification of nc machine tools | Control system. Cutting tools can move. Application of this kind of control system with CNC lathe, CNC drilling and CNC milling machine, etc.
3, profile control system and control system of continuous contour cutting control system, called on the control system can coordinate of two or more continuous control simultaneously strictly. It can not only control moving parts from one point to another to move that turns a point, but also can control the whole process of speed and every bit of displacement, the contour machining into shape. Application of this kind of control system with CNC milling machine, CNC lathe, CNC machining center, gear cutting machine tools and etc.
Second, according to the classification of control mode
1, the open-loop control CNC machine
The characteristics of open loop control system is the system of inspection feedback device, no single instruction information transmission, and instruction issued direction, no feedback back and open loop control.
Step by step motor is working frequency and the accuracy and precision of the transmission mechanism, the open loop system speed and accuracy are relatively low. But because of open-loop control, simple in structure, convenient, easy to maintenance, low cost, is still widely used in economical nc machine tools.
2, half closed-loop control CNC machine
Half a closed-loop control CNC machine is not directly detection of displacement worktable, but using Angle measured displacement detection devices, servo motor or of a ball screw rotation, calculate the actual displacement worktable, feedback to computer in comparison with the position of value, compared to control. Due in no feedback loop and half contains workbench closed-loop control.
Half a closed-loop control precision, but more closed-loop control good stability, low cost, debugging is easier, give attention to two or morethings open-loop control and closed-loop control both characteristics, so the more common applications.
3, closed-loop control CNC machine
The closed-loop control system is installed on the bench, use the actual displacement worktable detection devices will amount to a computer, and the feedback of the required position, compared with instructions for control, the difference value until now. Eliminate Visible, closed-loop control system can eliminate the mechanical transmission parts of error and workpiece machining process of the interference of the influence, thus greatly improve the machining accuracy. Speed is the function test components will be practical speed servo motor speed control signal to transform into the feedback circuits, calibration, motor speed maintain constant. Common speed motor speed detection devices is.
Closed-loop control is characteristic of high machining accuracy and move speed. This kind of CNC machine adopts dc or ac servo motor servo motor driving components, motor as the control circuit is more complex and expensive test components. Thus commissioning and maintenance, high cost more complex.
Third, the technique USES classification
According to the technology USES classification, nc machine tools can be divided into the nc drill press, lathe, milling, boring, grinding machines and machine etc, and gear processing, punch, bender, edm machine, machine, etc.
Machining center is an automatic knife knife library and the change of the device, it can be in nc machine tools on various computer processing. Once the clamping workpiece, can complete various processing, save, and improve working auxiliary machining accuracy. Especially suitable for machining center and shell of processing. Machining center can complete all of axisymmetrical parts processing.
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