數(shù)控機(jī)床中英文翻譯資料-數(shù)控設(shè)計(jì)-全文預(yù)覽
【正文】 act to produce a control system that could move the axis of a machine to calculated points automatically. The Massachusetts Institute of Technology (MIT) was subcontracted by Parsons to develop a motor that could control the axis of the machines. The servo motor was born. Parsons envisioned the following system. A puter would calculate the path that the tool should follow and store that information on punched cards. A reader at the machine would then read the cards. The machine control would take the data from the reader and control the motors attached to each axis. In 1951 MIT was awarded the prime contract to develop the machine control. The first machine produced by Parsons and MIT was demonstrated in 1952. Called a Cincinnati Hydrotel, it was a threeaxis vertical spindle milling machine. The machine control used vacuum tubes. One of the first attempts at making programming easier for people was called APT (Automatically Programmed Tool) Symbolic Language. APT, invented in 1954, used Englishlike symbolic language to produce a program that the machine tool could understand. Remember, a machine needs the geometry of the part and machining instructions such as speeds, feeds, and coolant to operate. APT made it easier for people to write these programs, which were then translated to a program that the machine could understand. In 1955 the Air Force awarded $35million in contracts to manufacture numerical control machines. The first numerically controlled machine tools were very bulky. The machine control was vacuumtube operated and needed a separate puter to generate its binary tape codes. (Binary coding systems use 1s and 0s). Programming plex parts took highly specialized people. Developments and refinements continued, and by the early 1960snu
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