Import system of numerical control of CINCINNATI L 0HC of horizontal machining center transform

CINCINNATI L 0HC is lab of academy of project of my school machinery the horizontal machining center that 80 time end imports, first wife system of numerical control of this company ACRAMATIC 900MC, shed servo drive continuously; 800mm of axis of 1000mm of axis of X of its size range of pipe bent, Y axis 1000mm, Z, contain workbench of ￠ 800mm graduation, the capacity of library of rotary table knife is 3 knives, belong to large and medium-sized machining center. Because entrance time is earlier, electric control is unit and compositive degree low, in last few years the system often appears breakdown, spare parts finally as a result of lack, bring about a machine tool to cannot be used. Had full-scale test to the machine tool above all, system of the servo that discovers a machine tool, hydraulic pressure is passable use, mechanical component still maintains taller precision, but computer control system and partial interface unit had damaged. In the consideration the price and extensive recover from an illness below all sorts of controls a function premise of organic bed, decision choosing matchs system of Xi Menzi 810M to realize four-axle to dominate 3 axes linkage, withhold system of original machine, hydraulic pressure and servo actuating device, use increment type coder to replace original sharp reaction synchronized to regard the position as feedback component, use PLC of the outfit inside Xi Menzi to control the I ／ O of the machine tool to nod, raise the dependability of interface. Primary machine tool uses inductive synchronized to undertake as positional feedback component closed circuit feedbacks, and the feedback signal that 810M system configures Xi Menzi basically to be able to handle coder only, need to increase changeover module ability to process the output signal of inductive synchronized. Consider changeover module price is higher, and the precision of primary machine tool is not quite tall (fixed position precision is 0. 02mm) , numerical control system compensates unit to have 1000, because this is affirmatory, increase pulse coder and servo electromotor axial end connects directly, realize control of feedback of half closed circuit. It is easy to also can make whole system is adjusted so, move more stable. Shuang Zhouduan is chosen here coder implementation and dynamoelectric crankshaft and measure fast dynamo photograph connection, form speed and positional feedback respectively. And, the numerous compensation that uses numerical control system to offer is unit, undertake, compensation of pitch of retrorse guide screw and clearance compensation, achieve original machine tool precision. Use PLC of the outfit inside Xi Menzi to finish system of switch of pair of machine tool spacing, hydraulic pressure, cooling system, main shaft to change knife, knife the control operation such as library management, main shaft and feed fold and operation face plate. The PLC job voltage of primary system is communication 110V, and voltage of job of Xi Menzi PLC is dc 24V, so need configures dc relay module, below the case that makes dc segregation, realize Xi Menzi PLC and machine tool to lose the link that person, output nods formerly. Main shaft part: Drive of machine tool main shaft is unit of a speed only, open loop control; Of main shaft stop to be controlled by machine and PLC definitely. Control process is: Cancel main shaft to make can, hang decelerate of neutral, main shaft to 20r ／ Min the following, insert fixed position to sell make main shaft locates, issue the signal that finish. Process of main shaft put into gear is: Get signal of put into gear, cancel to make can, delay time affirms main shaft stops, gear sways put into gear, issue the signal that finish. Knife library manages: Basically finish knife library 40, the hand is moved, the automatic memory, movement way that reachs its to press the shortest way to decide cutting tool and athletic pace count number of automata, blade holder. Change a knife automatically: When the system issues the statement that change a knife, z axis fall back on changes knife position, at the same time main shaft starts fixed position program, knife library starts the program that pick a knife, change a knife automatically through manipulator, z axis regain machines the position and start main shaft. DNC interface program: The memory of numerical control system is lesser, to the CNC Machining of complex curved surface the program can use an edge to machine an edge to send the means of the program only. Method of this kind of communication uses circular amortize register, come true by PLC process designing. The machine tool calls the police of text build: Oil of the pressure of loop of the voltage to the machine tool, electric current, hydraulic pressure, hydraulic pressure is face height, lubricant the sensor such as condition undertakes detecting, build unusual case call the police text, show in monitor, provide overhaul basis for handlers. After the interferometer of laser of machine tool classics after transforming checks compensation, the fixed position precision of the machine tool, precision that repeats fixed position precision to achieve original machine tool; Try cut standard test specimen to be measured via 3 coordinate machine measure, the fixed position precision of its linearity, circularity, aperture all achieves the treatment precision of test specimen of primary machine tool. Make clear transform plan economy feasible, 2 million yuan equipment throws value afresh again use. At present this machine tool is mixed in undergraduate students education main effect is produced in lab production. CNC Milling