The Composition Of CNC Devices in CNC Machine Tools

Input device: Input CNC instructions to the CNC device, and there are different input devices according to the different program carriers. There are mainly keyboard input, disk input, direct communication input in CAD/CAM systems, and DNC (direct numerical control) input connected to higher-level computers. There are still many systems that retain the paper tape input form of photoelectric readers.
(1) Paper tape input method. The part program can be read into the paper tape photoelectric reader to directly control the movement of the machine tool, or the content of the paper tape can be read into the memory and the part program stored in the memory can be used to control the movement of the machine tool.
(2) MDI manual data input method. The operator can use the keyboard on the operation panel to input instructions for the machining program, which is suitable for shorter programs.
In the control device editing state (EDIT), software is used to input the machining program and store it in the memory of the control device. This input method can reuse the program. This method is commonly used for manual programming.
On a CNC device with session programming function, different menus can be selected according to the prompts on the display, and the machining program can be automatically generated by inputting relevant dimension numbers through human-machine dialogue.
(3) Adopting DNC direct CNC input method. Save the part program in the higher-level computer, and the CNC system receives subsequent program segments from the computer while processing. The DNC method is often used for complex workpieces designed using CAD/CAM software and directly generating part programs.