The breakdown that numerical control machine tool winds reference point and eliminate

Time:2023-06-20 14:14:36
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source:ASEM CNC Machining

Summary: When numerical control machine tool is working normally, must to the machine tool axis of each numerical control builds the machine tool coordinate with a changeless origin is, the operation that makes the machine tool returns this to secure a place says to wind reference point operation, and the breakdown that winds reference point is one of commonner breakdown in numerical control machine tool, whether the treatment quality that returns reference point correctly to will affect a part. Mastered the breakdown form with a common reference point to reach only remove measure, ability produces the effect of numerical control machine tool better. Keyword: Numerical control machine tool; Wind reference point; When machine tool of trouble removal numerical control is working normally, must to the machine tool axis of each numerical control builds the machine tool coordinate with a changeless origin is, the grating feet of the photoelectricity coder that shows machine tool of acting numerical control to use increment formula commonly and increment type detects as the position feedback component, lost the memory to each coordinate position after the machine tool cuts off the power, because this must let each reference axis return a machine tool above all after switching on the mobile phone every time,one secures a place, build machine tool coordinate to fasten afresh, the origin that this secures a place is department of machine tool coordinate or at 0 o'clock, also call a machine tool reference point. The operation that makes the machine tool returns this to secure a place says to wind reference point operation. Whether the treatment quality that returns reference point correctly to will affect a part. Try to elaborate to answering reference point means and common breakdown below. 1 times machine tool of numerical control of reference point means winds the way of reference point, factor charges systematic type and machine tool manufacturer and different. machine tool of ordinary numerical control, answer reference point means to basically have use pulse coder (or grating feet) the magnetism switch law of bar case law and switch of use magnetic induction two kinds. Magnetism switch law applies lesser because of having fixed position drift, commonly used is bar case law. When using bar case method, pulse coder (or grating feet) turn together along with servo electric machinery, servo electric machinery every had turned proper point of view is L week normally) , pulse coder generates signal of a 0 marks, namely reference axis of corresponding machine tool is mobile between signal of every 2 0 marks distance of a make choice of, count this distance divide into equal parts by fair share, criterion each divide into equal parts is bar case span. When using bar case means, can come through mobile bar case position of wither full reference point. The position detects device rotates along with servo electric machinery generation bar is nodded or 0 marks signal, in the installation on machine tool noumenon a decelerate bumps piece (on athletic component) reach switch of a decelerate (on fixed component) . After reference point of the machine tool that start is searched, axis of corresponding numerical control can search direction and rapidder rate movement with the reference point of the setting, bump when decelerate piece when pressing next decelerate switch, decelerate of servo electric machinery continues to move to reference point. Bump when decelerate piece after leaving decelerate switch, decelerate switch is released, the first bar that numerical control system detects is nodded or 0 marks when signal, reference axis apply the brake is 0, next again deflection of reach reference point is measured (set of machine tool parameter) and stop, what stop the position to be machine tool reference point namely, right now servo electric machinery stops turn, reference axis fixed position, the on corresponding reference axis reading on machine tool screen is 0. When numerical control machine tool is made, after machine tool reference point decides through debugging, for convenient user observation, go up relative to athletic component in each reference axis by manufacturer commonly two when firm hits correspondence marked red arrowhead, the validity that reference point operates is answered after so that the user affirms,switching on the mobile phone every time. 2 times the breakdown analysis of reference point moves a reference point to operate with diagnostic hand is the premise that builds department of machine tool coordinate, the first movement after machine tool of great majority numerical control switchs on the mobile phone is the hand moves an operation to wind reference point commonly. If answer reference to nod occurrence breakdown to will not undertake the program is machined, the position that winds reference point forbids to will affect treatment precision truly, appear even accident hitting a car. Analysis and the issue that eliminate to answer reference point breakdown are very necessary. The machine tool answers reference point breakdown to have the following kinds of cases generally speaking: 2.

The 1 machine tool when returning reference point quits the position and reference point position abhorrent 2.

1 stop positional deviate reference point sufficient II of circumstance of majority of span of case of a bar | Decelerate bumps into an installation malposition truly or decelerate bumps into a too short be caused by. Law of check proved recipe is: Reduce the rate that approachs reference point by what parameter installs first, it is normal to if weigh,try a result, dash a position or decelerate switch seat through readjust, or increase appropriately bump into a length to be able to resolve this trouble. The method that also can choose deflection quantity to change electric origin through installing bar will solve. Because be outputted by hardware when signal of a decelerate,this is hind, ask when it is certain that digital servo software identifies this signal to need. Because this bumps when decelerate piece when leaving reference point too close, software does not take reference point signal sometimes, bring about reference point deviate. If weigh fruit trying order in sequence or arrangement to remain the same deviate, the parameter that can reduce fast feed speed or constant of fast feed time is installed, regain reference point. Because time constant is installed,this is too big or decelerate bumps piece too short, a limits bumps in decelerate inside, feed speed cannot be achieved approach reference point rate. When switch is released, although bar case signal appears, software detects speed did not achieve a feed approach reference point rate, answer reference point operation to also won't stop, produce reference point deviate consequently. There still is deviate after been use like afore-mentioned method, should check referenced juice to count implement the cost of the setting is effective, correction parameter is installed. This kind of breakdown often happens in change servo electric machinery or when shaking those who had adjusted the shaft coupling that electromotor and guide screw of ball of numerical control axis are linked together to repair or when processing work, always produce stable displacement error, and the pitch that as it happens is equal to guide screw. 2.

2 stop the position to produce random deviation, the main reason that causes this kind of trouble without regularity is outside interference, if screen ground connection is bad, detect whether do the telecommunication cable of feedback component and power source cable lean too nearly; Whether does the power source voltage of pulse coder pass low; Whether does pulse coder damage; Of numerical control system advocate printed circuit board undesirable; Whether do servo electric machinery and join of workbench shaft coupling become loose; Servo axis circuit board or servo amplifier board undesirable wait. When removing this kind of trouble, due and open train of thought and enough patience, reason of one by one undertakes checking, eliminate, until remove trouble. 2.

3 stop the position to produce reason of breakdown of small error majority to be cable or connector contact undesirable, or because of advocate printed circuit board reach speed to dominate unit character of service undesirable, cause the position to slant the amount is too large. Right now, need has examination of specific aim ground. 2.

2 machine tools cannot return reference point normally and have call the police can be aimed at call the police information, examine machine tool manual. Its are main the consideration is full the signal that answers generation of switch of reference point decelerate or 0 marks pulse signal invalidation (include signal to did not arise or lose in transmission processing) . If use pulse coder to make the place,detect device, behave those who be pulse coder the base mark signal that every turn (0 marks signal) did not input CNC, its reason often breaks a string because of pulse coder or the join cable take a percentage of a deal of pulse coder breaks a string. Additional, when returning reference point, the machine tool begins floating point to be apart from reference point to also can produce this kind to call the police nearly too breakdown. Accordingly, before the proposal is carrying out a reference point every time, use rod of each numerical control mobile key to move to suffer the stroke to this axis with electronic handwheel or hand first inside, execute a reference point operation again. Eliminate a method to be able to be used first outside Houneihexin date dogs law. So called outside, it is to point to install what go up in the machine tool to bump piece with reference point switch, the I/O position that can use interface of CNC system PLC indicates what observe signal directly to have without; So called inside, it is the 0 marks in pointing to pulse coder or the 0 marks on grating feet, can use oscillograph to detect 0 marks pulse signal. 2.

3 machine tools appear in system of the numerical control in returning reference point process " NOT READY " (did not get ready) condition and without call the police to check exterior condition to whether satisfy a requirement above all, wait like pressure and temperature; Whether does examination servo have frit silk to be burned with breaker tripping operation; The hot switch that checks electromotor whether start aside; It is normal that the examination controls systematic place to need each power supply; But the decelerate switch that majority of this kind of breakdown uses to return reference point is out of order, after touching head pressing to fall cannot restoration causes. Because this eliminates simpler also, need to check decelerate switch to whether return spring damages or change directly only decelerate switch can. 2.

4 appear when numerical control machine tool when answering reference point breakdown, should inspect following items mainly 2.

1 examination decelerate hits a state with decelerate switch, whether firm, have nondestructive bad; If do not have a problem, the drift that should check mechanical and relative position with dial gauge or laser measuring instrument further is measured; Decelerate bumps piece length is appropriate; The opposite relationship of position of switch of the position of rest that mobile component winds reference point, decelerate and reference point position is proper. 2.

Whether is the mode that 2 examinations wind reference point the first time that switch on the mobile phone winds reference point, the position that whether uses absolutely formula detects device. 2.

The motion that every turn measures electric machinery of 3 examinations servo; The examination winds reference point the setting of the parameter setting of constant of time of the parameter setting of fast feed speed, parameter setting that approachs reference point rate, fast feed and referenced tally is appropriate etc. The breakdown that machine tool of numerical control of 3 brief summary winds reference point is one of commonner breakdown in numerical control machine tool. And this kind of breakdown is commonly by bump piece become loose, the element such as the malfunction of decelerate switch causes. Of course, the 0 marks of the attaint of coder or grating feet and coder or grating feet appear the problem also can cause a reference point trouble, just coder and grating feet are opposite for reliability is higher, the probability of occurrence breakdown is lower just. Wanted us to master numerical control machine tool to wind the working principle of reference point and way only, understand order of its operation method, movement to make sufficient investigation and analysis to breakdown phenomenon, with respect to the reason that can find fault certainly, remove trouble finally, make the machine tool returns to normal. CNC Milling