First, the composition of CNC machine tools. CNC machine tools are composed of programs, input and output devices, CNC units, servo systems, location feedback systems and body body. The following is briefly introduced.
1. CNC unit. The CNC unit is the core of the CNC machine tool, consisting of information input, processing and output.
The control unit receives digital information. After decoding, interpolation, and logical processing of the control software and logical circuits of the CNC device, they will output various instruction information to the servo system to drive the execution agency by the servo system. Others include transmission, reversing and start -stop signals of major motion components; the selection and exchange of knife instruction signals, the start and stop of cooling lubrication, the loosening of the workpiece and mechanical parts, the division of the division platform, and so on.
2. Servo system. It consists of a driver and a driver motor, and the machine tool component and mechanical transmission components are performed together to form a CNC machine tool to enter the system. Its role is to convert the pulse signal of the CNC device into the movement of machine tool motion components. For step motor, each pulse rotates a angle of the motor, and then the motor component of the motor machine is a short distance. Each part of the feed movement has a corresponding servo drive system. The performance of the whole machine depends mainly on the servo system.
3. Location feedback system. Server motor angle displacement feedback and CNC machine tool (workbench) displacement feedback. Including grating, rotating encoder, laser ranging meter, magnetic gag, etc. The feedback device converts the detection result into a electrical signal to the CNC device. By comparing the deviation of the actual position and the position of the instruction, the deviation instruction instruction controls the feed movement of the execution unit.
4. Machinery parts processing manufacturers make machine tool mechanical parts. For the CNC machine tools of the processing center, there are also knife libraries and knife -changing robots. The mechanical components of CNC machine tools are similar to ordinary machine tools, but the transmission structure is simpler, with higher accuracy, stiffness and earthquake resistance requirements. The transmission and transmission systems are more convenient to achieve automatic telescopic.
