Engraving and milling machine CNC system system structure and some functions

When engraving and processing parts on a CNC engraving and milling machine, whether it is manual programming or automatic programming, the problem that Shouguang encounters is process processing. The part programs used by CNC engraving and milling machines are usually much more complicated than the part process rules used by ordinary machine tools. The process rules used by ordinary engraving and milling machines are actually just a process card. The tools used on the machine tool, cutting amount, cutting route, and working steps in the process are often selected by the operator. On the CNC engraving and milling machine.

These contents must become fixed purchase procedures. That is to say, it is the Dongqu that the operator can flexibly master, and it must be selected and arranged in advance, and written in the program. The part program must include the movement process of the machine tool, the selection of the tool, and the fixed tool The determination of the route, the choice of cutting amount, etc. This requires programmers to be highly qualified, familiar with the machine's performance, characteristics, cutting specifications and tool system, and the addition program must not make mistakes, otherwise accidents will occur.

CNC engraving and milling machine mainly adopts PC104 system technology. It is an industrial control bus specifically defined for embedded control. Its signal definition is basically the same as PC/AT, but the electrical and mechanical specifications are completely different. It is an optimization Compared with the ordinary PC and ISA bus control system, the embedded control system with a small, stacked structure has the following characteristics:

(1) Small size structure: The mechanical size of the standard module is 3.6×3.8 inches, which is 90×96mm.

(2) Stacked connection: The bus is stacked in the form of "pins" and "holes", that is, between the PC104 bus modules, the bus connection is bite and connected to each other through the upper needle and the lower hole. Good shock resistance.

(3) Easy bus drive: reduce the number of components and power consumption, 4mA bus drive can make the module work normally, and each module consumes 1~2W of energy. It is precisely because of the small size, low power consumption and reliable connection of PC104. Using PC104 as the host can greatly reduce the volume of the CNC controller and make the system more compact and reliable. Therefore, the PC104 industrial computer is used as the host computer to build a "position control card". +PC104" open form CNC system.