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When the CNC machine tool carries out machining operations, the machining program must be written to control the CNC machine tool. The part processing program includes the relative motion path between the tool and the workpiece on the machine tool, process parameters (spindle feed speed, etc.), and auxiliary motion. The part processing program is stored in the program carrier in a certain format and code, such as a perforated paper tape, a cassette tape, a floppy disk, etc., with a certain format and code. The program information is input to the CNC unit through the input device of the CNC machine tool.
Numerical control is commonly used in machine tools. Numerical control is defined as a form of programmable automation in which the process is controlled by numbers, letters, and symbols. In the case of machine tools, this programmable automation is used for machine operation. Numerical control technology can be applied to a variety of operations, such as drawing, assembly, inspection, sheet metal processing, and so on. But it is more prominently used in various metal processing processes, such as turning, drilling, milling, forming, etc. In this paper, the composition of the CNC milling machine and CNC machining center will be briefly introduced.
CNC milling machines are divided into the general type and full function type according to their functions.
The spindle unit is installed in the spindle box and driven by the spindle motor through the drive belt. The spindle driver receives the control signal from the CNC system and drives the spindle motor to realize variable frequency speed regulation, start-stop and quasi-stop.
The fore-and-aft movement and spindle box x-axis, Y-axis, and z-axis ball screw servo motors realize the control signals of the left-right movement of the milling machine workbench and the up-down movement of the saddle; Receive servo drive CNC system and drive x-axis, Y-axis, and z-axis servo motors.
In addition to the basic auxiliary functions such as lubrication and cooling, the machining center also has two important auxiliary functions: one is the control of the tightening tool in the spindle; The other is the tool selection of tool inventory and tool mechanical tool change control.
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