數(shù)控機床中英文翻譯資料-數(shù)控設(shè)計-展示頁
2025-05-27 01:25本頁面
【正文】 Parsons came up with the idea of using punched cards for the many calculations. The data could then be used to position the machine tool. Parsons submitted a proposal to the Air Force to develop a machine to produce these templates and received a development contract in 1948. His first attempts at automatic position control used punchcard tabulating machines to calculate the positions along the airfoil curve and an ordinary manual milling machine to position the tool to the tabulated positions. He had two operators, one to move each axis of the machine. This method produced airfoils tens of times more accurate than the preceding method, but was still a very timeconsuming process. In 1949,the Air Force awarded Parsons a contract 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 prod
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