7.lm establishs what car numerical control reachs servo to transform

1m is large establish a car to use system of FANUC 3TC numerical control formerly, dominate dc timing device and dc electric machinery; Main shaft drive uses the system of drive of silicon controlled rectifier that Hubei assists 80 time produce Fan Shangshi record; Electric equipment is controlled by relay, contactor. Because move all the year round, yuan ageing of parts of an apparatus, dependability difference, fault rate is high, affected production severely. For this, the decision undertakes technical reformation, use system of FANUC OTC numerical control to dominate communication servo feed and communication servo electric machinery, deserve to have inside the logistic control of system of the outfit PMC numerical control that finish; Use direct current of revolving stage of drive of system of drive of main shaft of Xi Menzi 6RA70 machine; Use ohmic dragon C200HE PLC to control machine tool electrical appliance. One, of system of the numerical control after transforming form FANUC OTC system to add outfit C7 PMC I/0 interface board and module of two communication servo and apply the brake of specific power consumption, 2 α 150 model communication servo electric machinery and inside coder of pulse Tibetan type makes half closed-loop control. OTC system uses structure of much microprocessor module, microprocessor, memory, input output control parts with form of plug-in unit board, along with is corresponding modular software a compose is successful can module. 1. Module of CNC management interpolation manages and organize the function of process of work of whole CNC system, be like systematic initialization, suspend administration, bus line adjudication, the system makes mistake identify and handle, soft, hardware diagnoses the system etc. Work program undertakes in module displacement of compensation of radius of encode, cutting tool, coordinate measures the pretreatment before the interpolation such as computation and feed speed processing. Undertake interpolation is calculated next, offer positional set-point for each reference axis. 2. The coordinate position after the position controls module to compare interpolation gives the real value that detects with positional coder, undertake adding decelerate automatically, scale integral gain adjusts, give out speed set-point goes as the statement cost of servo amplifier drive servo electric machinery. 3. The signal that PC module comes to by the machine tool makes logistic processing in this module, processing of scanning of program of classics PMC software and NC interface signal exchange news position, realize each function and mode of operation between interlocking. 4. Indication module of data input output is operated and all sorts of data of control part program, parameter, operation jussive input the output, state that shows all sorts of interface circuit signal. 5. Program of memory module storage and data. There is space of 4KM byte storage in the system, the working parameter of entire part machine program and system is deposited in the CMOS RAM that has mothball battery. 2, it is OK on CRT that PMC controls software and design to debug a method trends shows PMC program and real time monitors moving condition. Choose one L of PMC, C7I/0 board, the Control Panel of machine tool of join of electric principle graph according to the design and signal of auxiliary work station, the I/0 the machine tool nods signal to send the I/0 of PMC interface board. Distribute watch of good I/0 address, PLC data list. The address that uses in the program has R (in-house relay) , T (timer) , C (tally) , F (CNC → PMC) , G (PMC → CNC) , X (PMC is inputted) , Y (PMC is outputted) . Establish the structural characteristic of car machinery, hydraulic pressure, electric, numerical control according to this, scale controls flow chart. Undertake process designing according to particular logistic concern, the program is controlled except logic of contented machine tool, outside protection of each other lock, with least pace the number, briefest order handles time and the logistic relation that understand easily process designing. Software of FAPT Madder PMC is installed on the computer, string together a join with RS232 interface and OTC. memory the ordinal program in the computer conveys to OTC RAM flashboard in, carry out next. Logic of each sequence control is checked below OTC PMC monitoring, so that discover an error. The program is modified on the Madder software of PC, convey next in RAM flashboard, till till all sorts of components are logistic the movement is right. Finally, use machine of FANUC process designing to will debug good program solidify to be in EPROM, insert EPROM again it is on memory board, arrive in to load of program of lieutenant general of systematic electrify process in RAM. 3, the feedback of the voltaic annulus in system of feed of servo of numerical control of FANUC OTC of closed-loop control of servo of digital type communication, speed annulus, position annulus controls all digitlization, the vector control model of servo and dynamic compensation all reach control software to undertake real time is handled by high speed microprocessor, sampling cycle has zero millisecond only. The PID that has a number by software controls processing calculating type, optimize adjust. Software servo is more agile than hardware servo, algorithmic structure and parameter all can be changed, it is better to because this can be obtained,compare hardware servo move, static function. OTC position servo used contemporary control theory, the make a present of before be being used in annulus of buy of v/arc be on the throne and the compound control that feedback combines, achieve high accuracy and high rate, the static position error that eliminates a system completely, speed and acceleration error are finished in theory, come true namely complete " adjust without difference " . OTC position servo has following special functions. 1. The oscillation when stopping compresses functional electric machinery not to turn when stopping, very small error disturbs can be magnified by the scale gain of speed annulus, the possibility arises little shift, by speed feedback effect produces a retrorse torsion, if it is more than the attrition moment of force of the machine tool, can make electric machinery keeps swinging back and forth. Swing to restrain this to plant, the speed feedback pulse that must deduct electric machinery to arise reversely from inside the scale heft of speed annulus, n pulse oscillation compressed a function to deduct the scale heft of torsion, eliminated electric machinery consequently swing. Set parameter: 8103 4=1, reduce N pulse vibration functional go into effect, 8174 set compress n. 2.

250tts quickens feedback function to quicken feedback function is to use the feedback signal of electric machinery speed to multiply with feedback gain, undertake differring is worth computation to speed and acceleration statement cost, amend torsion order, control the oscillation of speed annulus thereby. This function is swinging frequency is when 150Hz is the following particularly effective, but the gain that if quicken,feedbacks is too big, unusual noise and oscillation can appear during adding decelerate. To solve this problem, should reduce the absolute value of gain. Set parameter: 8106 4=1 accelerate feedback function go into effect, 8176 set quicken feedback value, parameter value is set to lose a value. 3. The speed feedback function of machine tool of function of mechanical speed feedback can increase the rate of machine tool itself in the speed control of closed circuit, make positional annulus stable thereby. This function is a Ka of gain of feedback of machine tool speed, use at this feedback corrective torsion command. When Ka=1, corrective to torsion jussive value is equal to machine tool speed the corrective value of electric machinery speed. Set parameter: 8112 1=1, function of mechanical speed feedback is valid, gain of 8188 set feedback is worth. 4. Observation implement the function is become observation implement when functional become effective, the rate that its estimate to speed dominates return circuit as speed feedbacks. Because disturb the high frequency heft in the rate of affect and causes actual electric machinery of torsion (150Hz above) may be magnified by speed annulus, make thereby whole system with high frequency and oscillation. With observation implement output serves as speed feedback to be able to eliminate the high frequency heft in speed of actual electric machinery. phasic lag little low frequency weight feedbacks, can reduce the high frequency vibration of speed annulus. Set parameter: 8103 1=1, make observation implement the function is valid, 8147, 8150, 8151 part set 3 observation implement coefficient. Nextpage 5. Function of compensation exceeding tone (next graphs) issue order of a pulse when NC system, because right now the position feedbacks,be with speed. , command pulse is multiplied be worth VCMD with speed arising to dictate after positional gain Kp, as a result of the influence of force of attrition of machine tool slideway, electric machinery does not turn instantly, integral is right VCMI, instruction accumulative total, when the attrition moment of force that overcomes a machine tool when the torsion enough that this value produces, the action that because the position feedbacks,electric machinery turns, when MCMD and positional feedback value are equal, make VCMD is 0. The torsion TCMD 1 when electric machinery begins shift is more than the static attrition torsion of the machine tool. Moved when electric machinery after the equivalent of a pulse, torsion command turns into TCMD2, if TCMD2 is little,at kinetic friction electromotor turns ought to stop after equivalent of a pulse; But when be like TCMD2 to be more than kinetic friction, electromotor won't stop and generation exceeds tone, compensation exceeding tone is to avoid to appear the function of afore-mentioned phenomena exceeding tone. Set parameter: 8103 6=1, make function of compensation exceeding tone valid, gain of integral of depart of annulus of 8145 set rate, 8177 set exceed tone to compensate computation to be worth. 6. Current make a present of measures function of control of make a present of before when increasing, can make follow by what servo arises the appearance error that error place causes is reduced. Because the torsion of electric machinery is finite, offers trends adds decelerate to spend be restricted certainly, the machine tool when α of parameter of make a present of increases before place is added, the concussion error of decelerate also increases. But if athletic jussive adds slowdown time constant to increase (greaten) if, can allow to increase A cost. Anyhow, make a present of controls a function to add decelerate to be able to reduce outline error further before interpolation before. Set parameter: 8105 1=1, make a present of controls a function before effective, coefficient of the make a present of before 8168 set, coefficient of the make a present of before annulus of 8169 set rate. The setting of servo parameter passes a test in debug or computation can be obtained, when machine tool load inertia is very big and ambiguous when, can set parameter IDINT = 0 to undertake optimizing to servo, make the machine tool moves in the stability inside speed limits. Use α 150 model the static torsion that communicates servo electric machinery is 150Nm, rated rotate speed is 2000r/min, when moving actually electric current is between 20 ～ 30A, what the specification chooses electric machinery and real laden phase to match, but still will need to be in henceforth actual in learn ceaselessly and accumulate debug experience, make of electric machinery move, static character tends optimal. 4, system of drive of main shaft of Xi Menzi SIMOREG 6RA70 7.

1m establishs a car advocate electric machinery is L00kW, 380V, 273A, 1000/1800r/min, if=6.

6A, uf = 220V, choose the SIMOREG6RA70 of device of commutate of silicon controlled rectifier of 400A. Circuit of main circuit, excitation all has the reactor that take a line and fast fuse. 6RA70 interface controls signal to have: Control makes can (38 terminal) , the ／ that start stops (37 terminal) , device breakdown (46 terminal) , device gets ready (48 terminal) , advocate loop electrify affirms (110 with 109 terminal) . Device of SIMOREG6 RA70 commutate is three-phase alternating current source the total number control equipment of direct power supply, the regulating system of double closed circuit of speed electric current that uses a convention and logic do not have circumfluent and reversible means. It is but the armature of timing dc electric machinery and excitation power supply, armature and excitation loop all adjustment and the program module that transmission controls a function to control software to be formed through parameter by two efficient microprocessor will come true. The adjustment in armature loop the function has: Rotate speed set-point, rotate speed is worth actually, brae function generator, contain get used to modulatory speed controller oneself, voltaic adjustment, move to hit hair circuit, torsion is restricted etc. Among them the control law of adjuster is PI character. Normally move photograph process is computation goes out move photo corner or correspondence move the defer time of photograph start, mix by timer again output implement form what photo corner can accuse to spark pulse, produce circuit to form by double pulse next spark the double pulse that place of silicon controlled rectifier asks, at the same time implementation does not have the pulse switch of circumfluent logic and block function. Excitation loop adjusts function: EMK adjuster, adjuster of excitation electric current. Of 6RA70 optimize a function to be able to adopt P51 parameter set oneself, undertake optimizing to voltaic adjuster, rotate speed adjuster, excitation adjuster respectively; Measure automatically take use at rotate speed adjuster beforehand the attrition of controller and inertial torsion compensation; Measure automatically take the weak magnetism pilot that concerns with EMK to magnetize a gender curve and right when weak magnetism works of EMK adjuster optimize automatically. Reach load through optimize and adjusting parameter to obtain device and electric machinery between relatively beautiful matchs. The monitoring of 6RA70 can revise all parameter through operating face plate with diagnostic function. Signal of control of ministry of inside and outside closes through photoelectricity disaster implement make sure with interface circuit report is kept apart, increase interference rejection capacity. Excitation loop uses the closed circuit regulator that electric current feedbacks, in order to make sure excitation electric current is stable, can undertake metrical to the excitation character of electric machinery at the same time, in order to come true optimal weak magnetism rises fast character. Through switch quantity input outputs signal and control system to undertake interlocking logic is controlled, debug the optimal control of timing of electric machinery of didymous main shaft through whole. 5, the plan of electric equipment principle that ohmic dragon C200HE PLC completes control of machine tool electric equipment to press a design, assembled 4 electric equipment to control ark. Ohm contains RS232 port on dragon C200HE PLC CPU, support the computer of software of CPT process designing and C200HE link with SYSMAC, undertake online debug. Orgnaization of main shaft shift gears controls 2 oil cylinder by 3 electromagnetism a powerful person, drive two gear group to move up and down respectively, every groups of gear have fluctuation two positions, 4 block rotate speed. How to block of 4 inside main shaft box affirm switch. Pressure relay detects pressure of shift gears hydraulic pressure. The control process of main shaft shift gears comes true in PLC. PLC accepts shift gears to command, check main shaft electric machinery to whether be in first suspend status, there is main shaft electric machinery to stop on system of drive of 6RA70 main shaft turn signal, stop in main shaft electric machinery only when, just allow main shaft to change block. To make main shaft normal shift gears, when the machine tool dominates systematic set up an electric circuit, PLC blocks a switch with respect to scanning main shaft, with intermediate mark record " block currently " . The shift gears that PLC accepts command hind and " block currently " signal is compared, if differ, the shift gears that start is effective signal, block according to the target, a powerful person of corresponding shift gears electromagnetism urges corresponding gear campaign. In the meantime, switch of the 6RA70 that start measures an input " change block get used to signal " , the setting swings frequency, the clench the teeth in making gear is swinging. PLC detects block a switch accordingly whether become effective, if become effective, explain clench the teeth of shift gears gear reachs the designated position, illume to block an indicator light accordingly at the same time, explain shift gears is finished. After shift gears is finished turn automatically to gear case to lubricate. Electric equipment of nearly 150 machine tools controls signal to join C200HE PLC inputs output unit, finish strong report logic to control by PLC program, new the 4 control ark that make up uses Xi Menzi electric equipment to control yuan of parts of an apparatus, raised machine tool electric equipment to control systematic dependability. Made afresh advocate work station and box of operation condole button. Machinery and hydraulic pressure system also undertook heavying repair. 6, electric drive system transforms tool carrier the function of numerical control machine tool depends on greatly the function of servo drive system, the top traversal speed that is like a machine tool, dog the main index such as precision, fixed position precision all depends on of servo drive system move, the static state is characteristic. This are large numerical control establishs a car to use system of drive of dc of vintage silicon controlled rectifier formerly, performance is poor and not stable, often give an issue. The dc drive system that uses Xi Menzi undertakes replacing transforming. With two SIMODRIVE6RA26 (V3) axis of feed of tool carrier of center of drive of system of feed servo drive, finish the interface of buy of this two suit to control by ohmic dragon C200HE PLC. V3 system is three-phase bridge-type does not have system of timing of dc of circumfluent silicon controlled rectifier. Limit the impact of armature electric current to make sure the timing precision of dc motive is mixed, use the current limliting control that concerns from comfortable speed control and rotate speed and torsion, photograph of curve of one torsion character matchs the rotate speed that makes its can be moved with dc, make sure the system has the time response that first-rate is quickened and stirs. Be started in electromotor or in process of apply the brake, electromotor torsion and center electric current increase quickly, when armature electric current achieves demarcate to be worth, make electromotor with the biggest turn quickly, rotate speed rises sharply. Arrived to exceed even when the turn up of electromotor when giving, speed feedback voltage is more than speed to give voltage, the output of speed adjuster will retreat saturation, from be restricted amplitude falls, the input set-point that it regards electric current as adjuster will make center electric current drops, subsequently the torsion of electromotor also will drop, begin decelerate; When dynamoelectric torsion is less than laden torsion, electromotor can be quickened again, until return speed to decide a value afresh. Control of V3 system speed adds program of current limliting pilot and commonly used in the past double control photograph to compare, because do not have the series connection control of voltaic annulus, reduced segment delay advocate the response that quickened a system speed. 7.

After 1m numerical control establishs trick-cycling art to transform, the machine tool runs stable and reliable, operation brief practical. Pass test specimen treatment, product quality accords with a requirement completely. CNC Milling CNC Machining