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Maintenance of CNC machine tools

  • Categories:Industry news
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  • Time of issue:2020-02-13 10:11
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(Summary description)VarioustypesofCNCmachinetoolshavedifferentcharacteristicsduetotheirdifferentfunctions,structuresandsystems.Itsmaintenancecontentandrulesalsohavetheirowncharacteristics,andshouldbebasedonthetype,modelandactualuseofthemachinetool,andinaccordancewiththerequirementsofthemachinetoolmanual,formulateandestablishthenecessaryregular,gradedmaintenancesystem.Thefollowingaresomecommonandcommondailymaintenancepoints.SowhatarethemainmaintenancecontentsofCNCmachinetools? MaintenanceofCNCsystem: 1)Strictcompliancewithoperatingproceduresandroutinemaintenancesystems 2)ThedoorofCNCcabinetandstrongcurrentcabinetshouldbeopenedasfewaspossible Oilmist,dustandevenmetalpowderaregenerallyfoundintheairofmachiningworkshops.OncetheyfallonthecircuitboardsorelectronicdevicesintheCNCsystem,itiseasytocausetheinsulationresistancebetweencomponentstodrop,andevencausedamagetocomponentsandcircuitboards..Inthesummer,inordertomaketheCNCsystemworkoverloadforalongtime,itisnecessarytoopenthedooroftheCNCcabinettodissipateheat.Thisisahighlyundesirablemethod,whichwilleventuallycauseaccelerateddamagetotheCNCsystem. 3)RegularlycleanthecoolingandventilationsystemoftheCNCcabinet YoushouldcheckwhethereachcoolingfanontheCNCcabinetworksnormally.Checktheairductfilterforblockageeverysixmonthsorquarter.Iftoomuchdustaccumulatesonthefilternetanddoesnotcleanitintime,itwillcausethetemperatureintheCNCcabinettobetoohigh. 4)Periodicmaintenanceoftheinput/outputdeviceoftheCNCsystem MostoftheCNCmachinetoolsproducedbeforethe1980swereequippedwithaphotoelectricpapertapereader.Ifthetapereadingpartiscontaminated,itwillcauseerrorsinreadingtheinformation.Forthisreason,thephotoelectricreadermustbemaintainedinaccordancewithregulations.ContentsofmaintenanceofCNCmachinetools 5)PeriodicinspectionandreplacementofDCmotorbrushes ThetransientwearofDCmotorbrusheswillaffecttheperformanceofthemotorandevencausedamagetothemotor.Forthisreason,themotorbrushesshouldberegularlycheckedandreplaced.CNClathes,CNCmillingmachines,machiningcenters,etc.shouldbeinspectedannually. 6)Regularlychangethestoragebattery Ingeneralnumericalcontrolsystems,aCMOSRAMstoragedeviceisprovidedwitharechargeablebatterymaintenancecircuittoensurethatthecontentsofitsmemorycanbemaintainedduringperiodswhenthesystemisnotpowered.Ingeneral,evenifithasnotexpired,itshouldbereplacedonceayeartoensurethatthesystemworksproperly.ThebatteryshouldbereplacedunderthepowersupplyoftheCNCsystemtopreventtheinformationinRAMfrombeinglostduringthereplacement. 7)Maintenanceofsparecircuitboards Whenthespareprintedcircuitboardisnotusedforalongtime,itshouldbeinstalledintheCNCsystemforaperiodoftimetopreventdamage. Maintenanceofmechanicalparts: 1)Maintenanceofmaindrivechain Regularlyadjustthetightnessofthespindledrivebelttopreventslippagecausedbybeltslipping;checktheconstanttemperatureoiltankofthespindlelubrication,adjustthetemperaturerange,replenishtheamountofoilintime,andcleanthefilter;afterlong-termuseofthetoolclampingdeviceinthespindleTherewillbeagap,whichwillaffecttheclampingofthetool.Itisnecessarytoadjustthedisplacementofthepistonofthehydrauliccylinderintime. 2)Maintenanceofballscrewthreadpair Regularlycheckandadjusttheaxialclearanceofthescrewthreadpairtoensuretheaccuracyofreversetransmissionandaxialrigidity;regularlycheckwhethertheconnectionbetweenthescrewandthebedisloose;replacethescrewprotectiondeviceintimetopreventdustorChipsenter. 3)Maintenanceoftoolmagazineandtoolchangingrobot Itisstrictlyforbiddentoputoverweightandlongtoolsinthetoolmagazinetoavoidtherobotdroppingorthetoolcollidingwiththeworkpieceandfixturewhenchangingthetool;oftencheckwhetherthereturnpositionofthetoolmagazineiscorrectandthepositionofthetoolspindlereturnpointInplace,andadjustintime;whenthemachineisturnedon,thetoolmagazineandthemanipulatorshouldberundrytocheckwhethereachpartisworkingproperly,especiallywhetherthestrokeswitchandsolenoidvalvecanworknormally;Normally,itshouldbehandledintime. Maintenanceofhydraulicandpneumaticsystems: Regularlycleanorreplacethefiltersorsub-filtersofvariouslubrication,hydraulic,andpneumaticsystems;regularlyperformoilqualityinspectionandreplacementofhydraulicoilonthehydraulicsystem;andregularlydividetheairfilterintotheairfilteranddischargethewater; Maintenanceofmachinetoolaccuracy: Regularlycheckandcorrectmachinelevelandmechanicalaccuracy.Therearetwomethodsofcorrectingmechanicalaccuracy:hardandsoft.Itssoftmethodismainlycompensatedbysystemparameters,suchasscrewbacklashcompensation,fixed-pointcompensationforeachcoordinatepositioningaccuracy,andmachinetoolreferencepointpositioncorrection,etc.;hardmethodsaregenerallyperformedduringmachinetooloverhaul,suchasrailrepair,ballrollingPre-tighteningofthescrewnutpair,adjustmentofbacklash,etc.

Maintenance of CNC machine tools

(Summary description)VarioustypesofCNCmachinetoolshavedifferentcharacteristicsduetotheirdifferentfunctions,structuresandsystems.Itsmaintenancecontentandrulesalsohavetheirowncharacteristics,andshouldbebasedonthetype,modelandactualuseofthemachinetool,andinaccordancewiththerequirementsofthemachinetoolmanual,formulateandestablishthenecessaryregular,gradedmaintenancesystem.Thefollowingaresomecommonandcommondailymaintenancepoints.SowhatarethemainmaintenancecontentsofCNCmachinetools? MaintenanceofCNCsystem: 1)Strictcompliancewithoperatingproceduresandroutinemaintenancesystems 2)ThedoorofCNCcabinetandstrongcurrentcabinetshouldbeopenedasfewaspossible Oilmist,dustandevenmetalpowderaregenerallyfoundintheairofmachiningworkshops.OncetheyfallonthecircuitboardsorelectronicdevicesintheCNCsystem,itiseasytocausetheinsulationresistancebetweencomponentstodrop,andevencausedamagetocomponentsandcircuitboards..Inthesummer,inordertomaketheCNCsystemworkoverloadforalongtime,itisnecessarytoopenthedooroftheCNCcabinettodissipateheat.Thisisahighlyundesirablemethod,whichwilleventuallycauseaccelerateddamagetotheCNCsystem. 3)RegularlycleanthecoolingandventilationsystemoftheCNCcabinet YoushouldcheckwhethereachcoolingfanontheCNCcabinetworksnormally.Checktheairductfilterforblockageeverysixmonthsorquarter.Iftoomuchdustaccumulatesonthefilternetanddoesnotcleanitintime,itwillcausethetemperatureintheCNCcabinettobetoohigh. 4)Periodicmaintenanceoftheinput/outputdeviceoftheCNCsystem MostoftheCNCmachinetoolsproducedbeforethe1980swereequippedwithaphotoelectricpapertapereader.Ifthetapereadingpartiscontaminated,itwillcauseerrorsinreadingtheinformation.Forthisreason,thephotoelectricreadermustbemaintainedinaccordancewithregulations.ContentsofmaintenanceofCNCmachinetools 5)PeriodicinspectionandreplacementofDCmotorbrushes ThetransientwearofDCmotorbrusheswillaffecttheperformanceofthemotorandevencausedamagetothemotor.Forthisreason,themotorbrushesshouldberegularlycheckedandreplaced.CNClathes,CNCmillingmachines,machiningcenters,etc.shouldbeinspectedannually. 6)Regularlychangethestoragebattery Ingeneralnumericalcontrolsystems,aCMOSRAMstoragedeviceisprovidedwitharechargeablebatterymaintenancecircuittoensurethatthecontentsofitsmemorycanbemaintainedduringperiodswhenthesystemisnotpowered.Ingeneral,evenifithasnotexpired,itshouldbereplacedonceayeartoensurethatthesystemworksproperly.ThebatteryshouldbereplacedunderthepowersupplyoftheCNCsystemtopreventtheinformationinRAMfrombeinglostduringthereplacement. 7)Maintenanceofsparecircuitboards Whenthespareprintedcircuitboardisnotusedforalongtime,itshouldbeinstalledintheCNCsystemforaperiodoftimetopreventdamage. Maintenanceofmechanicalparts: 1)Maintenanceofmaindrivechain Regularlyadjustthetightnessofthespindledrivebelttopreventslippagecausedbybeltslipping;checktheconstanttemperatureoiltankofthespindlelubrication,adjustthetemperaturerange,replenishtheamountofoilintime,andcleanthefilter;afterlong-termuseofthetoolclampingdeviceinthespindleTherewillbeagap,whichwillaffecttheclampingofthetool.Itisnecessarytoadjustthedisplacementofthepistonofthehydrauliccylinderintime. 2)Maintenanceofballscrewthreadpair Regularlycheckandadjusttheaxialclearanceofthescrewthreadpairtoensuretheaccuracyofreversetransmissionandaxialrigidity;regularlycheckwhethertheconnectionbetweenthescrewandthebedisloose;replacethescrewprotectiondeviceintimetopreventdustorChipsenter. 3)Maintenanceoftoolmagazineandtoolchangingrobot Itisstrictlyforbiddentoputoverweightandlongtoolsinthetoolmagazinetoavoidtherobotdroppingorthetoolcollidingwiththeworkpieceandfixturewhenchangingthetool;oftencheckwhetherthereturnpositionofthetoolmagazineiscorrectandthepositionofthetoolspindlereturnpointInplace,andadjustintime;whenthemachineisturnedon,thetoolmagazineandthemanipulatorshouldberundrytocheckwhethereachpartisworkingproperly,especiallywhetherthestrokeswitchandsolenoidvalvecanworknormally;Normally,itshouldbehandledintime. Maintenanceofhydraulicandpneumaticsystems: Regularlycleanorreplacethefiltersorsub-filtersofvariouslubrication,hydraulic,andpneumaticsystems;regularlyperformoilqualityinspectionandreplacementofhydraulicoilonthehydraulicsystem;andregularlydividetheairfilterintotheairfilteranddischargethewater; Maintenanceofmachinetoolaccuracy: Regularlycheckandcorrectmachinelevelandmechanicalaccuracy.Therearetwomethodsofcorrectingmechanicalaccuracy:hardandsoft.Itssoftmethodismainlycompensatedbysystemparameters,suchasscrewbacklashcompensation,fixed-pointcompensationforeachcoordinatepositioningaccuracy,andmachinetoolreferencepointpositioncorrection,etc.;hardmethodsaregenerallyperformedduringmachinetooloverhaul,suchasrailrepair,ballrollingPre-tighteningofthescrewnutpair,adjustmentofbacklash,etc.

  • Categories:Industry news
  • Author:
  • Origin:
  • Time of issue:2020-02-13 10:11
  • Views:
Information
Various types of CNC machine tools have different characteristics due to their different functions, structures and systems. Its maintenance content and rules also have their own characteristics, and should be based on the type, model and actual use of the machine tool, and in accordance with the requirements of the machine tool manual, formulate and establish the necessary regular, graded maintenance system. The following are some common and common daily maintenance points. So what are the main maintenance contents of CNC machine tools?
 
Maintenance of CNC system:
 
1) Strict compliance with operating procedures and routine maintenance systems
 
2) The door of CNC cabinet and strong current cabinet should be opened as few as possible
 
Oil mist, dust and even metal powder are generally found in the air of machining workshops. Once they fall on the circuit boards or electronic devices in the CNC system, it is easy to cause the insulation resistance between components to drop, and even cause damage to components and circuit boards. . In the summer, in order to make the CNC system work overload for a long time, it is necessary to open the door of the CNC cabinet to dissipate heat. This is a highly undesirable method, which will eventually cause accelerated damage to the CNC system.
 
3) Regularly clean the cooling and ventilation system of the CNC cabinet
 
You should check whether each cooling fan on the CNC cabinet works normally. Check the air duct filter for blockage every six months or quarter. If too much dust accumulates on the filter net and does not clean it in time, it will cause the temperature in the CNC cabinet to be too high.
 
4) Periodic maintenance of the input / output device of the CNC system
 
Most of the CNC machine tools produced before the 1980s were equipped with a photoelectric paper tape reader. If the tape reading part is contaminated, it will cause errors in reading the information. For this reason, the photoelectric reader must be maintained in accordance with regulations. Contents of maintenance of CNC machine tools
 
5) Periodic inspection and replacement of DC motor brushes
 
The transient wear of DC motor brushes will affect the performance of the motor and even cause damage to the motor. For this reason, the motor brushes should be regularly checked and replaced. CNC lathes, CNC milling machines, machining centers, etc. should be inspected annually.
 
6) Regularly change the storage battery
 
In general numerical control systems, a CMOSRAM storage device is provided with a rechargeable battery maintenance circuit to ensure that the contents of its memory can be maintained during periods when the system is not powered. In general, even if it has not expired, it should be replaced once a year to ensure that the system works properly. The battery should be replaced under the power supply of the CNC system to prevent the information in RAM from being lost during the replacement.
 
7) Maintenance of spare circuit boards
 
When the spare printed circuit board is not used for a long time, it should be installed in the CNC system for a period of time to prevent damage.
 
Maintenance of mechanical parts:
 
1) Maintenance of main drive chain
 
Regularly adjust the tightness of the spindle drive belt to prevent slippage caused by belt slipping; check the constant temperature oil tank of the spindle lubrication, adjust the temperature range, replenish the amount of oil in time, and clean the filter; after long-term use of the tool clamping device in the spindle There will be a gap, which will affect the clamping of the tool. It is necessary to adjust the displacement of the piston of the hydraulic cylinder in time.
 
2) Maintenance of ball screw thread pair
 
Regularly check and adjust the axial clearance of the screw thread pair to ensure the accuracy of reverse transmission and axial rigidity; regularly check whether the connection between the screw and the bed is loose; replace the screw protection device in time to prevent dust or Chips enter.
 
3) Maintenance of tool magazine and tool changing robot
 
It is strictly forbidden to put overweight and long tools in the tool magazine to avoid the robot dropping or the tool colliding with the workpiece and fixture when changing the tool; often check whether the return position of the tool magazine is correct and the position of the tool spindle return point In place, and adjust in time; when the machine is turned on, the tool magazine and the manipulator should be run dry to check whether each part is working properly, especially whether the stroke switch and solenoid valve can work normally; Normally, it should be handled in time.
 
Maintenance of hydraulic and pneumatic systems:
 
Regularly clean or replace the filters or sub-filters of various lubrication, hydraulic, and pneumatic systems; regularly perform oil quality inspection and replacement of hydraulic oil on the hydraulic system; and regularly divide the air filter into the air filter and discharge the water;
 
Maintenance of machine tool accuracy:
 
Regularly check and correct machine level and mechanical accuracy. There are two methods of correcting mechanical accuracy: hard and soft. Its soft method is mainly compensated by system parameters, such as screw backlash compensation, fixed-point compensation for each coordinate positioning accuracy, and machine tool reference point position correction, etc .; hard methods are generally performed during machine tool overhaul, such as rail repair, ball rolling Pre-tightening of the screw nut pair, adjustment of backlash, etc.

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