Influence numerical control flies to those who cut motor-driven condition to cut precision all element experiment research

The athletic speed of the athletic rack that 1 shift cuts platform to cut process ⑴ rack to the trends of rack by shape the rate decision of labor situation. Shape labor situation by transducer drive. Its speed is one certain value. ⑵ floating platform by the drive of servo electric machinery of numerical control system. Mix of coder on floating platform strong cut a pattern. Undertake counting tine computation to the length of rack by coder. By strong cut a model to carry out trends to rush cut. ⑶ trends is strong cut ① to be when regular job, rack by shape labor situation drive moves with formulary speed. After rack enters floating platform, install the coder on floating platform to have count to the tine number of rack, arrive when computation signal " the computation that start is worth " when, numerical control system gives out servo electric machinery to actuating signal. ② floating platform is following to shift rack motion speed, arrive when computation signal " tine long computation is worth " when, right now floating platform rate has moved with rack speed is equal, the system is given out strong cut signal cut rack. ③ floating platform to stop, retrorse motion returns start. Wait to rush the next time cut a circulation. 1.

Of system of control of 2 floating platform form (1) control system advocate charge unit FX1S-20MR of 3 water chestnut. FX1S-20MR is in charge of receiving coder computation signal, issue floating platform actuating signal, strong cut signal, to break alarm, retrorse actuating signal. The servo electric machinery of ⑵ floating platform is the axis of a servo in numerical control system. Its Xiang Qi is moved / stop, start reversely / break alarm by advocate charge unit FX1S-20MR of 3 water chestnut is sent to numerical control system. ⑶ coder is homebred coder, every turn 32 pulse. Corresponding at rack it is every tine a pulse. Pulse signal receives FX1S-20MR. After the trends of 2 floating platform develops the relevant moving parameter of the PLC program that cuts mode analysis to finish floating platform in the work out and setting servo electric machinery, undertook trying cutting to rack. Experimented to run parameter each for a group with 5. Its are floating platform as a result moving metre accords with production to ask, but rack length accident is differ. Experimented all sorts of parameter still did not get satisfactory result. Must be opposite for this of floating platform strong cut means and influence to undertake careful analysis to each element that cuts precision, find out an influence to develop the main reason that cuts precision. 2.

The trends of 1 floating platform is strong cut mode to analyse a scheme the trends of 2 floating platform is strong if pursue,cut a course 2 show: (1) A-B phase: After rack enters floating platform, install the coder on floating platform to have count to the tine number of rack, arrive when computation signal " the computation that start is worth " when, numerical control system gives out servo electric machinery to actuating signal. Floating platform is started move quickly, when " rack journey " with " floating platform journey " poor = follows the journey, pursue namely the B dot of 2, the system gives out computation to finish signal (already up to mark cuts length) . (2) B-G phase: Floating platform continues to move quickly, rack also continues to move, speed of platform of shift of this one phase has not reach rack motion rate, both between have opposite shift. The opposite shift that this one phase produces namely " cut length error " Nextpage (3) B-C phase: Speed follows level. The purpose is to let floating platform speed achieve rack rate, make both speed completely equal. (4) C-D phase. In C the dot is given out strong cut actuating signal. Because the defer of electric machine makes an appointment with 200ms, the position is nodded actually to cut off rack in D. (5) D-E phase. To clear of positional coder computation is nodded in E. Because shake to what cut,can cause coder misoperation to give out pulse. To remove this effect, because this defer arrives,E dot just gives out to clear pulse. Nod from B so---The opposite motion that E nods rack of this one interval and floating platform (although very small) was not monitored by the computation of coder. (in practical test, in B the dot gives out to clear signal to cut length the most orderly be monitored namely because of rack motion whole journey. ) no matter shake pulse,be, negative be dropped by Qing Dynasty in E dot. But in E, F phase returns occurrence shake artery to rush, appear possibly two kinds of circumstances: ① pulse-------Appear short tine. ② loses pulse------Appear long tine. (6) E-F phase. Tally to clear---Floating platform to stop level. This one phase should make sure to clear is finished again to stop. Had appeared in this phase defer of to clear time arrives to it is normal to stop a dot to appear computation pulse is appeared thereby by to clear " long tine " phenomenon. 2.

Trends of 2 floating platform develops cut PLC program basis to develop the analysis that cuts pattern to floating platform trends, wove the PLC program of athletic section: The 0th pace is a setting " filter wave coefficient " , raise computation mouth X0 to receive the frequency of computation signal. The 6th pace receives mouth of coder computation signal to receive with X0. Tally C1 counts computation for rack length tine. C3 starts computation for floating platform. Tally of the 14th pace C3 reachs the designated position, send floating platform actuating signal (Y0) tally of the 35th pace C1 reachs the designated position, time of delay time T201 is late strong cut an instruction (Y5) tally of the 37th pace C1 reachs the designated position, time of delay time T202 is late instruction of tally to clear. 2.

The trends that 2 influences cut the element of length precision to be based on pair of floating platform is strong cut mode analysis, baconian the element that gives an influence to cut length precision is as follows; (1) coder pulse signal (2) synchronism is strong cut-----Rushing when cutting, if floating platform and rack have opposite campaign, strong cut length to cannot assure. Cut to realize synchronism to rush must adjust follow time, pursue namely the T201 in 2 medium C-D level and PLC program. (3) servo electric machinery quickens time 3 pairs of influences are strong cut precision the further analysis of all elements and optimize 3.

The signal of influence coder pulse of signal of 1 coder pulse-----Coder pulse signal is to control shift to platform moves and be given out develop the base that cuts signal. If interference signal change enters tally, strong cut length to shorten. If leakage dropped coder pulse signal, strong cut length to lengthen. When because this rushs in the analysis,cutting rack length, if rack is too long too short, be being judged above all is computation pulse abnormal. The coder that rack machine configures is homebred coder, specially is rack machine configuration. Every turn 32 pulse, correspondence ages for every 1 pulse. Rack pitch =6mm. When cent of rack speed =13000mm/ , its corresponding pulse frequency =36HZ, and the signal frequency =25HZ with PLC groovy acceptability interface, because this cannot use groovy interface directly. Nextpage (1) FX1SPLC of 3 water chestnut has tally of use high speed function of high speed tally. Use C235 of tally of single-phase high speed above all for this, but C235 of high speed tally suffers interference very easily, after coder signal receives high speed tally, monitor once coder rotates,observe on the picture in PLC, tally data instantly disorder. Although coder does not turn, tally numerical value also increases without the rule, it is to be disturbed apparently. (wiring is non-standard also meet aggravate interference, spot wiring once happened to did not use wiring terminal and the phenomenon that disturbs aggravate, convert after wiring terminal, interference decreases. ) use C251 of tally of double photograph high speed, the influence of interference decreases greatly. But not stable also. Sometime paragraph computation is stable. Sometime paragraph computation is not stable. Because PLC controller is mixed,numerical control servo and transducer are installed together within ark of a control. Numerical control servo and transducer are to have serious interference apparently to PLC. After the course experiments for many times, abandoned using program of high speed tally. (2) use common tally to use common tally to want to solve how to raise the question that receives signal frequency. One of its methods are to shorten the filter wave time that inputs signal. PLC of 3 water chestnut is had shorten the function of the filter wave time that inputs signal, its method is set a number to D8020. Program of the 3PLC that be like a graph the 0th pace. Pass law of this one party, can will accept signal frequency to raise 50HZ. The traversal speed of such OK and contented rack asks. But the filter wave time that inputs signal cannot have been installed quite small, the setting is too small ability of its interference rejection is reduced. Must fumble should optimal data. Its data D8020=3-5 made following step to the interference rejection of coder in the spot: Ground connection of line of ① coder screen. ② wears metallic canal alone. 3.

The acceleration that the 2 the most important level that quicken time trends to cut are floating platform follows level, pursue namely 2 medium A-G level. Must give out first before treating this one stage relevant athletic parameter. (1) length of rack of ① of relevant motion parameter------In order to age number shows. Be like 200 tine. ② pitch L-----------Unit Mm. ③ follows tine counts N (distance)-----A paragraph of journey of obligate, inside this journey, floating platform reachs rack traversal speed quickly. V of ④ rack traversal speed----Mm/ second ⑤ quickens time T-----The time that floating platform accelerates rack rate (2) " the journey is poor " and " quicken time " computation is quickening level: According to type 1 with the graph 2, quickened time T to decide the journey that quickens level is poor, from theoretic analysis, should adjust subtly only quicken time, can be in " = of travel path difference follows distance " same time place, the speed of speed = rack of dislodge platform. When be debugged actually, first according to type 2 follow certainly tine is counted (distance) ; Again according to type 3 adjust accurately quicken time. Its in principle is lengthened as far as possible inside limits of Cheng of floating platform head office quickly paragraph, its reason is to quicken time to grow more, jump over quickly smooth, avoid to quicken time too short the acceleration that cause oscillation, what affect synchronous rate thereby is smooth. 3.

Between clear zero hour of tally of time of 3 tally to clear----Rushing for many times in cutting a course, observe, rack overall length is spent often short 1-2 tine. Producing short a tooth-like part of anything is to the pulse with normal blame is entered necessarily. Is the pulse that this comes out more of generation of that one link? The course experiments and compare, discovery rushs in trends when cutting, strong cut the mechanical vibration with larger generation, and coder and strong cut a mould to be installed go up in floating platform, strong cut vibration to cause coder to shake can issue signal of a pulse sometimes. This pulse signal by plan be worth into normal computation, bring about rack length so short 1 tine. To remove this one effect. Must develop the arrangement of to clear dot of tally cut a time is extended again after finishing paragraph, pursue namely 2 medium " E " dot. Although have oscillatory pulse,enter tally so, also be in " E " the dot is kept clear of. From " E " the computation that the dot begins to undertake issueing one loop afresh. (from theoretic analysis, the to clear dot of tally should be arranged in " G " dot, namely current count value arrives, instantly to clear. The computation that enters below one loop) in PLC program, time of tally to clear is T202. Time of tally to clear must experiment repeatedly in order to obtain optimal value. 4 tests result and crucial factor 4.

1 prevent interference measure and experimental measure to disturb the influence of wave to eliminate electromagnetism, took following step: (1) move PLC controller a control ark, offer AC220V power source to PLC alone, PLC ground connection. Close PLC completely inside another metal ark. Make PLC part becomes independent completely. Exclude the effect of interference. Nextpage (2) parameter follows related the experiment of rice of =13 of rack traversal speed tine counts =10, impose decelerate pattern: Add decelerate point-blank. Increase slowdown time 360, 400ms, cut a result: Most length =1015-1022, slant long 4-10mm. Adjust servo electric machinery increases slowdown time, have the effect, but moving best condition also is to slant long 4-10mm. Below same group parameter, accident is differ. Although have,a few groups are cut length is euqally. Also be to slant long. (3) parameter follows related the experiment of rice of =8 of rack traversal speed tine counts =7, impose decelerate pattern: Add decelerate point-blank. Increase slowdown time 300- - 360ms cuts a result: Most length =1015-1022, slant long 4-10mm. One also have 1-2 root to slant in the group short 5mm. 4.

Analysis of result of 2 pairs of tests uses all sorts of parameter to rush to the trends of floating platform cut had a test, but strong cut the result very poor still. Below same group parameter, strong angrily length accident is differ. If experimental result expresses 1: Express 1 trends to be recorded to cogent check from the watch the experimental data of 1 looks, adjust quicken time to have the effect, when quickening time taper, cut rack length to approach standard length gradually, but cannot value of up to mark. And accident of a group of rack is differ. Those who cut precision rush in the influence in all elements, the effect that had excluded interference is mixed the influence of leakage plan pulse (reduced traversal speed) , and quicken time, synchronism follows time, to clear time has adjusted repeatedly and be in controlled condition. But strong cutting accident data result is so dispersive. So sure have one " not controlled element " or " random element " in effective. 5 search crucial factor 5.

The influence of 1 defer time is analysed again " the trends of floating platform is strong cut pattern " careful observation rushs actually cut a course, discover the defer of the existence that start of floating platform------Give out actuating signal to be started actually to floating platform from PLC namely, have the defer time that 120ms influences. The control system of rack machine by " PLC+NC " form, in PLC---Signal delivers process and time to be as follows between NC: ⑴ PLC is in charge of receiving computation signal, through floating platform actuating signal is being issued after operation, "The scanning of PLC is periodic + output defer " make an appointment with 20ms. ⑵ actuating signal is sent numerical control system and handle, this paragraph of time makes an appointment with 60ms. Controller of ⑶ numerical control gives out servo axis actuating signal sends through bus line " servo driver. " this paragraph of time makes an appointment with 40ms accordingly, total defer time makes an appointment with 100-120ms. This paragraph of time is by systematic hardware function place is decided, do not get control. And inside time of this paragraph of defer, (move with 13000mm/ cent speed when rack) rack had moved 29mm left and right sides. In the graph 2 shown trends rush in cutting pattern, 0-A phase is defer phase. And formula of computation of travel path difference must amend for: In system of rack engine control, because defer time is not a stable value, so its affected rack to rush greatly cut precision. 5.

2 rectify and reform measure and effect to reduce the effect of defer time, took following step: ⑴ changes system of floating platform drive, control this drive system directly by PLC. Reduce intermediate signal deliver link. ⑵ reduces rack traversal speed. After be being handled through above, the trends of floating platform cuts precision to get assuring. 6 last words: Trends is strong cut rush unlike the static state cut. The defer time that develops 100ms of hit the point in the static state won't cut precision to have any effects to rushing, and hit the point develops in trends, defer time becomes an influence to cut the main factor of precision. Maintaining the synchronism of floating platform and rack to move also is the base that trends cuts. CNC Milling CNC Machining