英語翻譯
The various computerized functions under CAD/CAM fall into three general areas:
1.Design/drafting,or computer-aided engineering.
2.Planning/scheduling,or management information systems.
3.Fabrication,or manufacturing automation.
A conceptualized or idealized CAD/CAM system is shown in Fig.This shows how the
user interacts with the computer via a graphics terminal,designing and controlling the manu-
facturing process from start to finish with information stored in a shared data base.With the
advent of interactive graphics,the problem of the user entering data and instructions into the
computer with stacks of coded punched cards or reels of taps went away.No longer was
the user required to be experienced in computer programming and operation to use the ma-
chine.With interactive graphics,the user communicates with the computer in display-screen
pictures.No knowledge of computers is required to operate these systems,and the communi-
cation is in real time,which means that the computer's response to the user's instructions is
almost instantaneous.In CAD/CAM,the requirement is for the solution of three-dimension-
al mechanical design and manufacturing problems.Interacting with the computer via key-
board and lightpen or other pencil like devices,the designer specifics points and lines on the
display screen to quickly construct a display-screen drawing or model.This is in reality the
representation of the diagram stored in the computer data base.