【正文】 placement precision is low. This system structure simple, debugging service convenient, work reliable, cost low, is easy to reequip successfully. The asynchronous motor or the direct current machine drive, diffraction grating survey feedback closed loop numerical control system This system and the open system difference is: Physical location feedback signal which by position detector set and so on the diffraction grating, induction synchromesh obtains, carries on the parison as necessary with the given value, two interpolations enlargements and the transformation, the actuation implementing agency, by the speed which assigns turns towards the elimination deviation the direction movement, until assigns the position and the feedback physical location 南 京 理 工 大 學(xué) 課程設(shè)計(jì)說(shuō)明 書(shū)（英文翻譯） 12 interpolation is equal to the zero. The closed loop enters for the system Enters for the system plex in the structure pared to the splitring, the cost is also high, requests strictly to the environment room temperature. The design and the debugging is all more difficult than the open system. But may obtain pared to the splitring enters for a system higher precision, quicker speed, actuation power bigger characteristic target. May act according to the product specification, decided whether uses this kind of system. The direct current servo electrical machinery drives, encoder feedback semiclosure link numerical control system Half closedloop system examination part installs in among passes in the moving parts, indirectly surveys the executive ponent the position. It only can pensate a system ring circuit interior part of part the error, therefore, its precision pared to closedloop system precision low, but its structure and the debugging all pares the closedloop system to be simple. In makes the angular displacement examination part and the speed examination part and the servo electrical machinery time a whole then does not need to consider the position detector set installs the question. The current production numerical control system pany factory quite are many, overseas famous pany like German SIEMENS Corporation, Japanese FANUC Corporation。 New system functional scope, application method and with old system difference。 The engine bed processing precision achieves 177。s another model。 The transformation three axle has used the roller lead screw and the gear drive organization on the machinery. The entire transformation work including the machine design, the electrical design, the engine bed overhaul, finally is the entire machine installment and the debugging. After the milling machine transforms, processing effective stroke X/Y/The Z axis respectively is billion mm。 Retained the original main axle system and the cooling system。 Programming standard and automated programming and so on. The key point is makes, gets a good grasp of the operating manual and the programming instruction booklet. the numerical control transforms se Transforms the scope according to each equipment differently, must beforehand design the connection partial transformations, if transforms pletely, should design the electromechanical transformation connection, the operation kneading board control and the disposition, the interconnection partial contacts, the parameter measuring point, services the position and so on, the request operates and services conveniently, reasonable, the line moves towards, center the small junction smoothly few, the strong and the weak electrical noise is smallest, has the suitable allowance and so on. Partial transformation, but also needs to consider the new old system the performance match, the voltage polarity and the size transformation, install the position, the digitalanalog conversion and so on, when the necessity must manufacture the transformation connection voluntarily. 南 京 理 工 大 學(xué) 課程設(shè)計(jì)說(shuō)明 書(shū)（英文翻譯） 16 veral examples 1st, transforms the X53 milling machine with SIEMENS 810M In 1998, the pany invested 200,000 Yuan, with German Simens the 810M numerical control system, the 611A exchange servo drive system sds was the X53 milling machine carries on X, Y, the Z three axle numerical control transformation to a pany39。s request. Fifth in the numerical control transformation the main mechanical part reequips the discussion A new numerical control engine bed, must achieve in the design that, Has the high static dynamic rigidity。s started the largescale application numerical control engine bed. Its essence is, uses the information technology to the traditional industry (including the armed forces, airplane weapon industry) carries on the technological transformations. Except that uses outside the numerical control engine bed, FMC, FMS in the manufacture process, but also includes in the product development carries out CAD, CAE, CAM, the hypothesized manufacture as well as carries out MIS in the production management (management information system), CIMS and so on. As well as increases the information technology in its production product, including artificial intelligence and so on content. Because uses the information technology to the country foreign troops, the airplane weapon industry carries on the thorough transformation (to call it being an information based society), finally causes them the product in the international military goods and in the goods for civilian use market the petitive power greatly is the enhancement. But we in the information technology transformation tradition industry aspect pared to the developed country to fall behind approximately for 20 years. Like in our country engine bed capacity, numerical control engine bed proportion (numerical control rate) to 1995 only then %, but Japan has reached % in 1994, therefore every year has the massive mechanical