Change add decelerate structure to apply mediumly in system of open sex numerical control
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source:EAMOM CNC Machining
High speed, high accuracy is the objective that numerical control technology pursues from beginning to end. In high speed treatment, must ask each movement rod can be achieved inside cutty time given speed can be in high speed journey the instant stops definitely. If consider to had shortened only from time,cross a process, and of incorrect machine tool add decelerate trends process to have reasonable control, be sure to bring very big impact to machine tool structure. As technology of computer bus line more and more mature, numerical control system also opens sexual structure to have by development of fixed die type, can convenient user undertakes the guest is made change those who recombine is flexible mode. Integrate database principle, the influence the system crosses those who cross a process to add decelerate curve, use change the structure controls fashion, can raise the dynamic function of numerical control machine tool and stable state precision effectively. Change in adding decelerate structure to control system of principle tradition numerical control, come true directly by systematic program commonly onefold and specific impose decelerate control. It cannot assure to be opened in the machine tool stay frequent case, the smooth stability that stops to move with the machine tool since the instant that satisfies tall feed speed at the same time. To solve this problem, ask on one hand numerical control system can because of machine and different, come because of different of from time to time trends adds decelerate to control regular; certainly on the other hand, need to use special method to realize this kind to add decelerate curve in controlling a system. The article puts forward change add decelerate structure to control a method to use database principle, will add decelerate to control cent to be described to add decelerate with implement two parts, will add decelerate description and depart of systematic program photograph. Such, if want those who change a system to add decelerate to control the rule,need to be revised independently only add decelerate to describe data, and do not need to modify program of numerical control system, offer a kind of open change to add decelerate curve new method for the user thereby. Is its principle: ? Does children's hair cast of Xing of of Ran of twin of Ling of of Fen of aurelian limp of Dong Yun collect pledges crafty of Mei of of sauce Hui washs rice does of v/LIT all over the ground of ⒁ of of Qian ⒒ waiting till vast does Li of of Fen of aurelian limp of collect of closely question of small line of impossible of of banter of Pang of male Di asking sauce hut small? 8 plum of Piao Pi neon of ǖ of any of several hot spice plants enlighten place of? of Bin of heart the sliding weight of a steelyard is shown. Graph 1 change add decelerate structure to control principle block diagram to pursue 1 in, there are all sorts of example curves in adding decelerate curve library. When the system moves, the concerned control data that gives out according to data processing module above all and the machine tool that come from check measure feedback link run data actually to undertake decelerate is analysed adding. If need to impose decelerate control, inform a curve of the choice to module is singled out from inside adding decelerate curve library the most appropriate add decelerate curve, give out add decelerate to control an instruction to give add decelerate computation module, the adds decelerate curve computation to give current sampling cycle twinkling speed per hour that You Jigen occupies a make choice of is spent. Generate workbench motion contrail by module of interpolation contrail computation further, give out athletic statement to send toward actuating device, finally by actuating device with the hope add decelerate to control regular drive machine tool to move, the dynamic character that makes the machine tool moves thereby is achieved optimal. Composition of workbench of 3 axes motion and characteristic make a system in order to be based on " industrial PC + professional sport controls card " for core, use the number below the pine to communicate servo to make structure of hardware of an open mode. Provide content at the same time the athletic function library with rich, powerful function, use the process designing technology with object-oriented VC++ , implementation PC, motion controls the communication between card and servo driver, its structure is shown 2 times like the graph. Graph condition of setting of the input that system of campaign of 2 3 axes comprises block diagram PC to basically implement machine program, editor, parameter, movement shows and add decelerate to analyse the blame such as computation to be controlled in real time. Athletic control card finishs pulse of computation of contrail of interpolation of each movement rod, output / the on directional motion command signal and receiver bed a few I/O that concern with athletic control measure an input. Among them, pulse signal controls the pace number that electric machinery place takes, directional signal controls electric machinery positive and negative to turn, in order to realize the positional control of 3 axes. Origin of X axis, Y axis, Z axis, spacing detects is will come true through a group of mechanical switch, origin detects switch becomes an user with a future life coordinate of three-dimensional campaign system is origin, spacing detects switch ensures every axis works journey limit. Evacuation of circuit of segregation of n plastics circuit, photoelectricity enters logic of these condition signal classics in register of status of athletic control card, numerate at any time by CPU, achieve pair of I/O condition signal detect. On hardware, because used photoelectricity to keep apart measure, such, kept apart the peripheral interference to in-house number system already, prevent overvoltage effectively again, outside crossing electric current to wait, the bound breaks out incident to be opposite the attaint of all of computer science department, raised control precision of the system and dependability greatly. This system developed PC software adequately resourceful with the good point with computational sharp speed, absorb the characteristic of CAD/CAM, after using modelling software to generate part drawing, translate into of system of recycle numerical control processes G code, instruction G code and machine tool real position has analytic comparative producing instantaneous rate, explain its to for motion orbit controls function by board card next, move through calling finally the interpolation block inside function library, output pulse and directional signal, control servo of position of half closed circuit to drive workbench to run, the character of trends of dimensional contrail method that realizes a hope and stable state precision. Be based on driver of electric machinery of servo of the communication below the pine implementation of pilot of position of half closed circuit issues terminal of servo driver wiring in the pine, PULS1, SIGN1 parts to be linked together with the pulse signal of athletic controller and directional signal, PULS2, SIGN2 is received + 5V signal, the place that forms collector open a way transmits signal. COM+ , COM- is received respectively + 15V power source is losing end. SRV-ON and COM- are linked together. Such, what finished the position to control mode to fall is basic connect a line. Other can have even the line proper link according to systematic need. Parameter setting undertakes through feeling face plate, control means chooses buy to be positional control, torsion restricts buy to disable for the input, drive prohibits buy disables for the input, buy of choice of means of instruction pulse input is pulse / symbolic means, instruction pulse prohibits buy disables for the input. Every turn buy of output pulse number is 2500. Bikegen occupies electronic gear to need actually to undertake installing. Because servo electric machinery passes the guide screw rolling individual plant of shaft coupling and workbench to be linked together, mechanical tigidity is tall, when will automatic gain is adjusted, mechanical and rigid buy is 9, the high speed that assures whole transmission system answers a gender. Does gain parameter use self-correcting means: ? In-house set of? of collect Zhao ざ ) mode makes electric machinery is mixed quickly decelerate, need the inertia of torsion computation bear from place, next according to inertia, decide proper gain automatically. Other parameter presses the default setting when leaving factory. Because main transfer machinery used half closed circuit to communicate servo drive, control precision and traversal speed get huge rises, the sexual price that raised a product greatly is compared. In the position control means falls, the positional command signal that servo driver receives athletic controller to give out (pulse / directional) , send pulse row form, after classics electron gear assigns times frequency, deviation signal is formed after deviation is compared with feedback pulse signal in reversible tally. Feedback pulse is by photoelectricity coder is detected the actual pulse number that when electric machinery rotates, produces, via the generation after fourfold frequency. Of annulus of position of classics of positional deviation signal compound before after controller of make a present of adjusts, form speed command signal. Speed command signal and speed feedback signal (detect with the position plant is same) the integral of scale of annulus of speed of deviation signal classics after comparing generates voltaic command signal after controller adjustment, after alternating via vector in voltaic annulus, export torsion electricity by SPWM, control those who communicate servo electric machinery to move. The position controls precision by photoelectricity coder every change the line of production unripe pulse counts control. It divides coder of increment type photoelectricity and coder of very form photoelectricity. Increment type coder is tectonic and simple, master easily, mean life is long, resolution is high, actual application is more. What this system uses is coder of increment type photoelectricity. Coder of very form photoelectricity presses binary encode output, line is much, depend on as a result of precision digit, so high resolution gets not easily. But this kind of coder also can export absolutely angle information when immobilize namely, in basically be being used at tall progression of complete closed circuit to charge a machine tool. Block diagram of driver of electric machinery of servo of coder of photoelectricity of type of increment of the company below the pine shows 3 times like the graph: Graph epilogue of block diagram of control of driver of servo of the company below 3 pines is reasonable adding decelerate automatically to control is to make sure system of high speed campaign is dynamic the important segment of function and stable state precision. What be based on fixed curve traditionally is automatic add decelerate to because lack is flexible,be controlled, assure not easily to run smooth premise to fall in the machine tool, implementation spends Cheng time with transferring the shortest those who be a target is best add decelerate to control the rule, satisfy high speed to machine the requirement to precision hard. Use change add decelerate texture, use open sex of the system, will add decelerate description and depart of photograph of program of numerical control system, make when change system adds decelerate performance, need to be revised independently only add decelerate to describe data, it can come true conveniently with library of real time discrete data. Such, the system can rise by actual condition change fall fast control curve, assure the flowing sex that the machine tool runs, it is one kind agrees with what high speed machines is flexible and automatic add decelerate to control fashion. CNC MillingCNC Machining