【正文】 the end of the 7039。 Second is NC, the addend reveals the installment on the ordinary 南 京 理 工 大 學(xué) 課程設(shè)計(jì)說明 書（英文翻譯） 9 engine bed, or adds the numerical control system, transforms the NC engine bed, the CNC engine bed。 Moreover, because many years use, the operator already understood to the engine bed characteristic, uses and services the aspect to train the time in the operation short, effective is quick. The transformation engine bed as soon as installs, may realize the capacity load revolution. may fully use the existing condition May fully use the existing ground, does not need to like buys when the new equipment such to have reto construct the ground. may use the newest control technology enhances the production equipment the automated level and the efficiency, improves the equipment quality and the scale, alters to the old engine bed now the horizontal engine bed. Fourth, numerical control system choice When the numerical control system mainly has three kind of types, the transformation, should act according to the special details to carry on 南 京 理 工 大 學(xué) 課程設(shè)計(jì)說明 書（英文翻譯） 11 the choice. Stepbysteps the open system which the electrical machinery drives This system servo drive mainly is stepbysteps the electrical machinery, the power stepbysteps the electrical machinery, the battery solution pulse motor and so on. Entering sends out which by the numerical control system for instruction pulse, after the actuation electric circuit control and the power enlargement, causes to stepbystep the electrical machinery rotation, through gear vice and ball bearing guide screw vice actuation executive ponent. So long as the control mand pulse quantity, the frequency as well as the circular telegram order, then may control the executive ponent movement the displacement quantity, the speed and the heading. This kind of system does not need the physical location and the velocity feedback which obtains to the input end, therefore called it the open system, this system displacement precision mainly decided in stepbysteps the electrical machinery angular displacement precision, transmission part and so on gear guide screw pitches the precision, therefore the system displacement 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)說明 書（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。 The power is big。 New system functional scope, application method and with old system difference。 Retained the original main axle system and the cooling system。 The engine bed processing precision achieves 177。 Maximum speed X/The Z axis respectively is 。s another model。 Manual enters for speed X/Y/The Z axis respectively is billion mm/Min。 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。 Manual is fast is X/The Z axis respectively is 。 Retained the original main axle system and the cooling system。 Maximum speed X/Y/The Z axis respectively is 5000/1500/800 mm/Min。 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,