1、相关专业英文翻译 Modern Computer-Aided Part Programming Modern development in the process of CNC programming In the past, programming was performed manually. The program was written in word address and was tailored to run on a particular controller. Trigonometry was a must for determining tool paths. The CN
2、C machine needed to be halted while the operator keyed the program into the machine control unit. The CNC machine was further tied up for program verification, which involved machining a test part and inspecting the results. The digital computer, however, has change the way programs are written, che
3、cked, and run. Some of the most dramatic improvements provided by the computer include off-line programming, the use of computer-aided programming language, and the application of CAD/CAM to programming. CNC machines operate at optimization when turning part programs and machining parts. This goal i
4、s achieved when new programs are written and tested at an off-line computer terminal. The program can be composed directly in word address (G codes and M codes) with the aid of text editing software. It can be tested and then stored on punched tapes, diskettes, Zip diskettes, or CD-ROM media. If the
5、 remote computer has a communication line to the CNC machine, the program can be downloaded directly to the machines controller. This technique is known as off-line programming. An Introduction to Computer-Aided Programming Language The controller of a CNC machine can only operate on word address (G
6、 codes and M codes). Furthermore, these codes must be entered according to a specific format acceptable to the particular controller. A computer-aided programming language is meant to address some of these problems. A computer-aided programming language allows the programmer to unite the program usi
7、ng English-like command, not G and M codes. Because the tool path is described in terms of these commands, trigonometric computations are not needed. All tool parameters such as tool diameter, tool speeds, and feeds are easily specific. Furthermore, the programmer neednt be concerned with tailoring
8、the program to a particular controller. A program known as a postprocessor can be used to automatically translate the program written in a computer aided programming language into a corresponding word address program. Special postprocessors have been written for each machine controller. This allows
9、a single program written in a computer-programming language to be applied to many different types of machine controllers. The most popular computer-aided programming language still in use is APT. APT is short for Automatically Programmed Tools. It was the first and still is the most powerful compute
10、r programming language. APT can be used to program the machining of complex surfaces on four-axis and five-axis machine centers. It was originally restricted to run on large mainframe computers. Advances in microprocessor technology have allowed it to be available on workstations and personal comput
11、ers. Introduction to CAD/CAM Technology CAD/CAM stands for Computer-Aided Design and Computer-Aided Manufacturing. Experienced programmers use this powerful tool to simplify the task of writing and testing part programs. In the right hand, CAD/CAM can dramatically boost the productivity of CNC shops
12、. The CAD/CAM approach is superior to the technique of using a computer-aided programming language to program part programs. Some of the advantages of using CAD/CAM are: The system can be used for off-line checking of the program. Resulting tool paths can be graphically displayed on the computer scr
13、een. The user can zoom in and view the tool paths at various orientations. The system can generate real time material removal displays and flag tool breakthrough or part violation problem: Time and cost of machining the part can be quickly determined The system can determine optimum tooling speeds and feeds for the material
