數(shù)控技術(shù)外文翻譯-數(shù)控設(shè)計-展示頁
2025-05-27 01:27本頁面
【正文】 umerical control consists of a sequence of directions that causes an NC machine to carry out a certain operation, machining being the most monly used process. Programming for NC may be done by an internal programming department, on the shop floor, or purchased from an outside source. Also, programming may be done manually or with puter assistance. The program contains instructions and mands. Geometric instructions pertain to relative movements between the tool and the workpiece. Processing instructions pertain to spindle speeds, feeds, tolls and so on. Travel instructions pertain to the type of instruction and slow or rapid movements of the toll or worktable. Switching mands pertain to on/off position for coolant supplies, spindle rotation, direction of spindle rotation, tool changes, workpiece feeding, clamping and so on. The first NC programming language was developed by MIT developmental work on NC programming systems in the late 1950s and called APT (Automatically Programmed Tools). DNC and CNC The development of numerical control was significant achievement in batch and job shop manufacturing, from both a technological and mercial viewpoint. There have been two enhancements and extensions of NC technology, include: (1) Direct numerical control. (2) Computer numerical control. Direct numerical control can be defined as a manufacturing system in which a number of machines are controlled by a puter through direct connection and in real time. The tape reader is omitted in DNC, thus relieving the system of its least reliable 黃石理工學(xué)院 畢業(yè)設(shè)計（論文）外文文獻翻譯 7 ponent. Instead of using the tape reader, the part program is transmitted to the machine tool directly from the puter memory. In principle, one puter can be used to control more than 100 separate machines. The DNC puter is designed to provide instructions to each machine tool on demand. When the machine needs control mands, they are municated to it immediately. Since the introduction of DNC there
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