Machining center reference point and its breakdown are diagnosed

  • Time:
  • Click:138
  • source:SHERBURNE CNC Machining
Content summary: ? Astounded of Gu of Qian of  of  of buy of Wen of envy of Mou Wei of travel of ぶ of  outskirt commonplace is contrary to  of a surname of  of act of refute of  antrum  sinceres feeling male of department of Gao of Di of Lang of  of the  that steal Jin is contrary to  steals  Qiao to hang down male of ǖ of blind pool of glare of  of gourd ladle of principle columns of a hall scrupulously and respectfully C engraves ɑ  , it is the dot of the mechanical origin of the machine tool and coincide of electric origin photograph, it is the fixed dot on the machinery after origin revert. Every machine tool can have a referenced origin, also can install many referenced origin according to need, use at automatic cutting tool to exchange (ATC) or pull dish of switch automatically (APC) etc. Reference point regards workpiece coordinate as the primitive frame of reference of the department, after machine tool reference point is certain, department of each workpiece coordinate is built subsequently. Alleged and mechanical origin, it is the datum mark that basic and mechanical coordinate ties, once mechanical component is assembled end, establish of mechanical origin immediately. Alleged and electric origin, be detect by what machine tool place uses the reference point of the bar spot signal that feedback component place issues or establish of 0 marks signal. To make electric origin and mechanical origin coincide, the parameter that must use electric origin deflection of origin of a setting to measure to the distance of mechanical origin undertakes installing. The dot of this coincide is machine tool origin. In machining center use process, machine tool hand is moved or answering reference point automatically to operate is the action that often has. No matter the machine tool detects,feedback component is to deserve to use coder of increment type pulse or coder of very form pulse, below certain circumstance, if have ATC or APC process in, axis of machine tool some or all axis should answer referenced origin first. Detect by machine tool detecting element of origin signal means different, the method that returns machine tool reference point has two kinds. One kind chooses a magic art for bar, another kind is magnetism switch law. In bar spot standard, detector turns as electric machinery signal produces spot of a bar or pulse of a null at the same time, in the installation on mechanical noumenon a decelerate bumps piece after reaching switch of a decelerate, the first bar that numerical control system detects is nodded or null signal is origin namely. In magnetism switch law, magnet and switch of magnetic induction origin are installed on mechanical noumenon, detect when switch of magnetic induction origin after origin signal, servo electric machinery stops instantly, should stop a dot to be identified origin. If be close to origin speed to be less than some to secure a value,the characteristic of bar spot method is, criterion servo electric machinery always stops at same point, that is to say, after undertaking origin is operated answering, the maintenance of machine tool origin the gender is good. The characteristic of magnetism switch law is software and hardware simple, but origin position becomes scale ground drift as the change of speed of servo electric machinery, namely origin is not affirmatory. Current, almost all machine tools use bar to choose a magic art. Use bar nods a law to answer a few kinds of case of machine tool origin to be as follows: 1. Use increment detects the first time after the machine tool of feedback component switchs on the mobile phone answers machine tool origin; 2. Use very form to detect machine tool of the first time when after the machine tool of feedback component is installed, be being debugged switchs on the mobile phone an origin; 3. The hand uses first time of the machine tool after bar nods deflection to measure parameter setting to adjust an origin. The different fraction that measures way according to detecting element is mixed to clear with means of absolutely pulse coder clear with means of increment pulse coder. In using absolutely pulse coder to serve as the system that surveys feedback component, after the first time before the machine tool is debugged switchs on the mobile phone, after through parameter the setting cooperates a machine tool to answer 0 operations to adjust appropriate reference point, the mothball batteries that wants absolutely pulse coder only is effective, of after this switch on the mobile phone every time, need not undertake reference point is operated answering. In the system of coder of use increment pulse, answer reference point to have two kinds of pattern, one kind is after switching on the mobile phone, 0 mode are answered in reference point each axis hand moves an origin, after every time switchs on the mobile phone, should undertake the hand moves an origin operation; Another kind in be use process, g code instruction is used to answer origin in what memory mode falls. Coder of pulse of use increment type switchs on the mobile phone as the machine tool that measures feedback component the behavioral process that the hand uses an origin has commonly the following 3 kinds: 1.

When the hand moves an origin, the fast feed rate that returns origin axis to be installed with parameter first moves to origin direction, bump when origin decelerate piece when pressing next origin decelerate switch, decelerate of servo electric machinery is close to speed to continue to move ahead to the origin that installs by parameter, bump when decelerate piece after releasing origin decelerate switch, numerical control system detects when the spot of the first bar that gives out to coder or 0 marks signal, clear the axis stops, this stops a dot to be machine tool reference point namely. 2.

Answer origin axis to move to origin direction with fast feed speed first, be bumped into by decelerate when origin decelerate switch piece pressure when falling, answer origin axis apply the brake to be to speed 0, in move in order to approach origin rate to opposite way, bump when decelerate piece after releasing origin to be close to switch, numerical control system detects detect when the spot of the first bar that feedback component gives out or 0 marks signal, answer 0 axes to stop, this bits namely machine tool origin. 3.

When answering origin, answer origin axis to move to origin direction with fast feed speed first, bump when origin decelerate piece when pressing next origin decelerate switch, apply the brake of recursive origin axis is to speed 0, again to opposite way jiggle, bump when decelerate piece when releasing origin decelerate switch, clear the axis moves along direction of former fast feed reversely again, bump when decelerate piece when pressing next origin decelerate switch again, clear axis in order to be close to origin speed reach, decelerate bumps piece after releasing decelerate switch, numerical control system detects when spot of the first bar or 0 marks signal, clear the axis stops, machine tool origin subsequently establish. Use increment type detects the machine tool of feedback component switchs on the mobile phone hand of each servo axis uses first time answer origin to be used mostly bump into a type revert, ever since each origin revert can dictate with G code with high speed of fast feed speed revert comes the reference point position of the memory when revert of first time origin. Control a process to analyse the revert of machine tool origin from numerical control system further, the machine tool is answering mode of machine tool origin to fall, servo electric machinery secures the feed speed of speed to rotate to origin direction with be more than some, detect when numerical control system electric machinery turns when signal, the referenced tally inside numerical control system by to clear. If passed parameter to install bar to order deflection quantity, inside referenced tally be automatically also by set and the value with equal amount of bar spot deflection. After this, referenced tally becomes tally of a round. Arrive to computation of mobile instruction pulse when tally when the value of referenced tally set by restoration, as turn the occurrence of signal produces drop of a bar. Bump when decelerate piece when pressing next origin decelerate switch, electric machinery decelerate arrives be close to origin speed to move, bump piece after releasing origin decelerate switch, electric machinery stops in next bar spot, generation answers origin to finish mark signal, referenced position by restoration. After power source open return origin the 2nd times, because consult tally already was installed, bar spot already was built, because this can return origin position directly. Use detect absolutely when the machine tool first time of feedback component answers origin, above all numerical control system and very form detect feedback component undertakes data corresponds in order to build current position, calculate the distance that the current position distance to machine tool origin and current position nod to the closest bar, computation the value endows with tally, bar is nodded by establish. Answer reference point to appear when machining center when breakdown, above all by arrive simply complex undertake checking. Check origin decelerate first whether does Chong piece become loose, decelerate switch is secured firm, whether does switch damage, 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, examination decelerate bumps piece length, the examination answers the concern of position of switch of origin position of rest, decelerate and origin position, the examination answers origin mode, whether be the first time after switch on the mobile phone answers origin, whether to use absolutely pulse coder, wait eye electric machinery the carry momentum that every turn, instruction times detect than reaching times by than, the parameter setting that the examination answers the parameter setting that fast spurt gives origin rate, parameter setting that approachs origin rate and constant of fast feed time is appropriate, examining a system is complete closed circuit still be half closed circuit, check referenced tally setting to whether wait appropriately. Answer origin breakdown phenomenon and diagnostic attune synchronization to be as follows suddenly: 1. Whether does examination of drift of the origin after the machine tool answers origin use absolutely pulse coder, if use, diagnose the origin drift when the synchronization that reach tone sees the machine tool that uses absolutely pulse coder answers origin suddenly; If use the machine tool of increment pulse coder, should deciding the system is complete closed circuit still is half closed circuit, if be system of complete closed circuit, diagnose the origin deflection in adjusting measure to see system of complete closed circuit; If be system of half closed circuit, check mechanical and relative position with dial gauge or laser measuring instrument whether drift. If not drift, it is the position shows only have deviation, whether does the examination slant for workpiece coordinate department buy is invalid. After the machine tool answers origin, position of machine tool CRT shows to be not 0 values, this value depends on department of coordinate of workpiece of certain such as slants a kind parameter installs buy. Be like deflection of mechanical and relative position, decide deflection is measured. If deflection quantity is one bar case, diagnostic method sees the processing move that one bar nods origin drift. If drift measures number pulse, see origin drift counts the diagnostic move of a pulse. Whether does the cost that examines pulse amount and referenced tally otherwise match. If do not match, amend what the value of referenced tally makes to match; If match, criterion pulse coder is bad, need changes. 2.

The origin drift when the machine tool that uses absolutely pulse coder answers origin is checked above all and heavy new setting and machine tool answer what origin concerns to detect the concerned parameter of absolutely position, retry to wind origin operation afresh, be like origin still drift, whether does examination machinery have change relatively. If do not have drift, it is the position shows only have deviation, check workpiece coordinate to slant buy is effective; Be like mechanical position deflection, breakdown of coder of absolutely pulse. 3. The origin drift in system of complete closed circuit checks system of half closed circuit to return the drift case of origin first, if normal, should check electric machinery to turn whether is mark signal offerred by system of half closed circuit, the examination concerns parameter setting and signal cable connection. If parameter setting is normal, criterion the linear such as grating feet measures component undesirable or breakdown of its interface circuit. If parameter setting is incorrect, amend a setting to try again. 4. Spot of a bar reduces origin drift to approach origin rate by what parameter installs first, try an origin operation again, be like origin not drift, bump for decelerate piece too short or installation is undesirable. Can bump through changing decelerate piece or the position of decelerate switch will solve, also can change electric origin to solve through installing bar to nod deflection. After signal of a decelerate is outputted by hardware, identify this signal to need proper time to digital servo software, because this bumps into a software when leaving origin too close to be not caught sometimes to origin signal when decelerate, bring about origin drift. After if reduce,be close to origin speed parameter to install, try origin revert again, be like origin still drift, can reduce ' fast feed speed or the parameter setting with fast feed invariable time, regain origin. If time constant is installed too big or decelerate bumps piece too short, a limits bumps in decelerate inside, feed speed cannot arrive approach origin rate, when be close to switch to be released, although bar nods signal to appear, software was not detecting feed speed arrives when approaching rate, answer origin operation to won't stop, consequently origin happening drift. If reduce the setting of speed time constant or fast feed speed, answer origin afresh, origin still has deflection, the cost that should examine referenced tally to install is effective, correction parameter is installed. 5. If just be in,origin drift counts a pulse drift of the origin when the first time after switching on the mobile phone answers origin, get interference be no longer in force for 0 marks signal. To prevent noise interference, should ensure ground connection of cable screen line is good, the scintilla with necessary installation is restrained implement, do not make detect the telecommunication cable line of feedback component and strong wire cable lean greatly close. If be not,change in the origin when switching on the mobile phone to answer origin first only, the set that should amend referenced tally is worth. If pass afore-mentioned measure examinations to still cannot remove trouble, should check voltage of coder power source whether too low, whether does coder damage, whether does the shaft coupling of servo electric machinery and workbench become loose, systematic main circuit board normal, whether does circuit board reach servo amplifier normally about servo axis board whether to wait normally. Origin breakdown exemple: 1. Taiwan DM4400M machining center produces Z axis direction to machine dimension to be not stabilized, dimension out of tolerance and mobbish breakdown, that is to say, drift of occurrence mobbish of Z axis origin, CRT and servo amplifier do not have any calling the police to show. This machining center uses system of M3 of 3 water chestnut, means of half closed-loop control, communication servo electric machinery and ball guide screw pass shaft coupling direct link. The control means that according to breakdown phenomenon union this machine uses, connection means undertakes an analysis, breakdown reason may be bolt of shaft coupling connection becomes loose, bring about slide between shaft coupling and ball guide screw or servo report crankshaft. Undertake checking to connection of Z axis shaft coupling, discover shaft coupling tightens calm bolt 6 times to appear become loose. After deciding bolt closely, trouble removal. 2. Taiwan DM4400M machining center is used in appear number of some of the position that change a knife is wrong, the breakdown with some normal numbers. When the position that change a knife produces change, also be changed accordingly to treatment dimension by the Z of treatment workpiece, and answer relatively with the change of the position that change a knife. Do not have any calling the police to show. This machining center uses system of numerical control of M3 of 3 water chestnut. Switch on the mobile phone answer reference point to use following means: The positional coder that installation carries a department at servo electric machinery every turn the bar place that 360 ° have a certain quantity of equidistance, the distance between two bar spot calls bar dot interval. Switch on the mobile phone when the hand moves a reference point, the axis moves quickly to reference point with a speed entering a place of parameter set first, should be close to reference point decelerate to bump piece press next answering when switch of journey of reference point decelerate, the inferior immediateness that the axis establishs with parameter rate is floating, should be close to reference point to bump piece leave a reference point decelerate to go paragraph of switch when, the place that the first bar that coder detects chooses is the position of reference point revert. Because machinery has its inherent mechanical origin, reason asks electric origin wants to agree with mechanical origin. The deflection that mechanical origin and electric origin ask calls reference point deflection, in the set in G28sft parameter. Leave when switch of reference point decelerate be close to reference point decelerate to dash a seat when, not be near center of bar spot interval when, reference point can produce deflection sometimes, can pass parameter Grmask the set of bar spot screen prevents deflection of reference point position. The machine tool changes a knife to nod by the set of the 2nd referenced origin of the machine tool, and the 2nd referenced origin is by the machine tool the first referenced origin is decided. As a result of the breakdown some that machine tool place appears the order has, some orders are done not have, because this suspects this the machine tool,switch on the mobile phone the problem appears when the hand moves a reference point. Via checking, z axis answers fixed head of switch of journey of reference point decelerate and pillar to secure not firm, become loose badly, bring about origin drift. CNC Milling CNC Machining