CN103048968A - Network cluster-control-based numerical control machine tool error real-time compensation system and compensation method - Google Patents
Network cluster-control-based numerical control machine tool error real-time compensation system and compensation method Download PDFInfo
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Abstract
The invention discloses a network cluster-control-based numerical control machine tool error real-time compensation system and a network cluster-control-based numerical control machine tool error real-time compensation method. The compensation system comprises a hardware part and a software part built in hardware, wherein the hardware part comprises a master control center personal computer (PC), a router, a built-in Ethernet port or a personal computer memory card international association (PCMCIA) Ethernet card, a temperature sensor and a temperature data acquisition card; and the software part comprises a temperature acquisition module, an error modeling and calculating module, a cluster-control compensation module and a machine tool state network monitoring module. By the compensation system and the compensation method, error real-time compensation and working state information monitoring can be performed on a plurality of numerical control machine tools on a production line at the same time; the movement precision of the numerical control machine tools is improved in batches; and therefore, the compensation efficiency and the final machining precision are greatly improved.
Description
Technical field
The present invention relates to a kind of machine tool error compensation system and method, be specifically related to a kind of NC Machine Error real-time compensation system and compensation method of team control Network Based, belong to the numerically-controlled machine processing technique field.
Background technology
Modern Mechanical Manufacturing Technology is just towards high-level efficiency, high-quality, high precision, high integrated and high intelligent future development.Accurate and Ultraprecision Machining has become most important ingredient and developing direction in the modern mechanical manufacturing, along with the widespread use of precision processing technology, the requirement of Precision of NC Machine Tool is improved day by day.
Machine tool error refers to the initial position error and the kinematic error that are comprehensively caused by manufacturing, installation, motion control out of true and the other factorses such as cutter, lathe bed and thermal deformation in the machine tool motion space.Studies show that: the error that the geometric error of lathe (by the error that lathe itself is made, the assembling defective causes), hot error (causing the error that thermal deformation causes by the lathe temperature variation) cause accounts for 70% of lathe total error, so the Geometric error and thermal error to numerically-controlled machine compensates, it is the important channel of improving machine tool motion performance and machining precision.
200410093428.1), Chinese patent " digital control machine tool positioning error real-time compensation device " (number of patent application: 200710045903.1) and the article that is entitled as " Geometric Error for Computerized Numerical Control Milling Machine and hot error synthesis modeling and real-Time Compensation thereof " delivered at 2012 " mechanical engineering journal " such as Wang Wei through existing literature retrieval is found, mainly contain Chinese patent " based on the NC Machine Error compensator of lathe exterior coordinate system biasing " (number of patent application:.The machine tool error compensation system that above-mentioned document is mentioned consists of as main hardware with single-chip microcomputer substantially, by lathe I/O expansion module and PMC(Programmable MachineController) carry out communication.This class error compensation scheme need to for every lathe is equipped with separately error-compensating apparatus, not take full advantage of PMC internal storage space and data operation ability according to different machine tool structures and digital control system type, and hardware cost is larger.Moreover, the data-transmission mode between compensation system and the PMC adopts the parallel port data-transmission mode based on the I/O module, and hardware connects complicated.
Along with the development of machine building industry, people not only need a machine tool is carried out error compensation, also need many lathes on the production line are compensated simultaneously, to improve the machining precision of whole production line.If traditional error compensating method " is copied " on the production line in all lathes simply, will certainly bring larger hardware expenditure, nor meet the central controlled regulatory requirement of the means of production.
Summary of the invention
The present invention is directed to the prior art above shortcomings, propose a kind of NC Machine Error real-time compensation system and compensation method of team control Network Based, it has many number of units controlled machine on the production line is carried out high-precision error compensation function and good presence monitoring function simultaneously.
The present invention is achieved by the following technical solutions:
A kind of NC Machine Error real-time compensation system of team control Network Based is characterized in that: described bucking-out system comprises hardware components and the software section that is built in this hardware; Described hardware components comprises: Master Control Center PC, router, built-in ethernet port or PCMCIA Ethernet card, temperature sensor, the temperature data acquisition card, wherein, Master Control Center PC is connected with router, router is connected with the built-in ethernet port of each numerically-controlled machine, Master Control Center PC is by the IP address of each numerically-controlled machine in the identification team control network, realize carrying out data interaction from different numerically-controlled machines, temperature sensor is connected with the temperature data acquisition card and measures in real time the temperature data of the crucial measuring point of numerically-controlled machine, and the temperature acquisition cartoon crosses router and Master Control Center PC carries out bidirectional data interaction; Described software section comprises: temperature collect module, error modeling and computing module, team control compensating module and conditions of machine tool network monitoring module; Wherein, temperature collect module is preserved the temperature data of the crucial measuring point of lathe that Real-time Collection arrives; Error modeling and computing module are set up error model according to the temperature data of machine tool error measurement data and crucial measuring point, and calculate the error compensation value under the condition of different temperatures; The team control compensating module calculates under condition of different temperatures in the team control network error compensation value of each feed shaft in each numerically-controlled machine, generate and constantly update the error compensation value form of each numerically-controlled machine, and with it timesharing, sequentially be transported among each lathe PMC, the work state information of each numerically-controlled machine in the conditions of machine tool network monitoring module monitors team control network.
Described temperature collect module refers to: the program module that the temperature data to the temperature sensor that distributes on the crucial measuring point of each numerically-controlled machine in the team control network in the bucking-out system interactive software gathers, stores and shows.Can obtain the temperature data of the crucial measuring point of lathe by temperature sensor and temperature data acquisition card, temperature collect module is preserved temperature data, is used for error modeling, the calculating of error compensation value and the real-time demonstration of temperature curve of lathe.
Described error modeling and computing module refer to: according to the different motion topological structure of different numerically-controlled machines in the team control network, the machine tool error data that measure and the temperature data of crucial measuring point are carried out modeling, obtain in the team control network error model of each feed shaft in each numerically-controlled machine.In the error compensation process, this error modeling and computing module can be updated to the temperature data of the crucial measuring point that measures in real time in the error model again, thereby calculate the error compensation value of each feed shaft in each numerically-controlled machine under condition of different temperatures.
Described team control compensating module refers to: the temperature data of the crucial measuring point that arrives according to the error model of each numerically-controlled machine in the team control network with by the some cycles Real-time Collection, the error compensation value of each feed shaft in calculating each numerically-controlled machine under condition of different temperatures, generate and constantly update the error compensation value form of each lathe, and with its timesharing, sequentially import in the D address storaging unit of each lathe PMC; Each numerically-controlled machine PMC reads the coordinate position of each feed shaft in real time in the team control network by window function, and definite residing concrete coordinate position section of this coordinate position, from the D address storaging unit, call error compensation value corresponding to current coordinate position in the mode of tabling look-up, and import in the R address storaging unit of PMC; The EMZPS(ExternalMachine Zero Point Shift of each numerically-controlled machine, the skew of exterior mechanical initial point) the error compensation value in the funcall R address storaging unit, with its side-play amount as mechanical origin, finally realize the real-time error compensation of many lathes in the team control network.
Described conditions of machine tool network monitoring module refers to: Master Control Center PC carries out the program module of network monitoring simultaneously to the duty of the many number of units controlled machine in the team control network; Described work of numerical control machine status information comprises: the systematic parameter of lathe, compensating coefficient, load condition and warning message; Master Control Center PC calls FOCAS(Fanuc Open CNC APISpecifications) correlation function function in the Dynamic Link Libraries, by mating the IP address of each lathe, data-transmission mode with Ethernet obtains the work of numerical control machine status information from each numerically-controlled machine digital control system, realize the duty of the many number of units controlled machine in the team control network is carried out network monitoring simultaneously.
Another technical scheme of the present invention is:
The NC Machine Error real-time compensation method of the team control Network Based that a kind of said system realizes, it may further comprise the steps:
The first step, many number of units controlled machine to be compensated on the production line is set up the team control network;
Second step, with laser interferometer and temperature sensor the Geometric error and thermal error of each numerically-controlled machine in the team control network is measured, set up error model and be kept among the Master Control Center PC according to error features and Changing Pattern;
The 3rd step, when each numerically-controlled machine is implemented error compensation in to the team control network, the temperature data of each crucial measuring point of numerically-controlled machine of measuring in real time is updated in the error model of numerically-controlled machine, calculate the error compensation value under the condition of different temperatures, and generated error offset form;
The 4th goes on foot, calls the correlation function function in the FOCAS Dynamic Link Libraries, by the Ethernet data transmission mode, with the error compensation form timesharing of each feed shaft in each numerically-controlled machine, sequential delivery in the D address storaging unit among each numerically-controlled machine PMC in the team control network;
Each numerically-controlled machine PMC obtains the real-time coordinate position of each feed shaft of today's numerical control lathe in the 5th step, the team control network, and determine to be placed on the error compensation value corresponding with current coordinate position in the D address storaging unit by tabling look-up, and by the PLC program this offset is given in the R address corresponding with this feed shaft, then the offset in the EMZPS funcall R address is finally realized the team control compensate function as the side-play amount of mechanical origin;
The 6th step, gather the temperature variations of the crucial measuring point of each numerically-controlled machine according to the cycle of setting, re-started for the 3rd step to the 5th step, constantly each NC Machine Error under the Current Temperatures condition is compensated.
The described first step specifically refers to: each numerically-controlled machine to be compensated on the production line is connected with Master Control Center PC by router with built-in ethernet port or PCMCIA Ethernet card, the control network of complete, Master Control Center PC is by the IP address of the different numerically-controlled machines of identification, and whether test connects normal in order to carry out bidirectional data interaction.
Described the 3rd step specifically refers to:
3.1 establishing the travel range of numerically-controlled machine feed shaft is L, is divided into L/p coordinate position section as the interval take p, the interval p of coordinate position section determines according to the storage size of D address storaging unit among compensation precision requirement and the numerically-controlled machine PMC;
3.2 the temperature data in a certain moment is updated in the error model of this feed shaft of being set up by second step, calculate the error compensation value of node under this temperature conditions of each coordinate position section, take the offset of measuring starting point as 0, then with the error compensation value of the Nodes that the calculates offset as position in this coordinate position section, obtain the offset curve of step change type, in the error compensation value write error offset form with all Nodes, obtain the error compensation value form under this temperature conditions;
3.3 set up the error compensation value form of other all feed shafts of numerically-controlled machine in the team control network with the step identical with 3.1 and 3.2.
Described the 5th step specifically refers to:
5.1 the every number of units controlled machine in the team control network is write different PLC programs according to the system configuration of oneself, after Master Control Center PC imports to each numerically-controlled machine D address storaging unit with error compensation value form, call voluntarily error compensation value under the corresponding current coordinate position of each feed shaft of this numerically-controlled machine and the crucial measuring point temperature value by each numerically-controlled machine PMC in the scan period from the D address storaging unit at ladder diagram;
5.2 at ladder diagram in the scan period, obtain the current coordinate position of each feed shaft by the PMC window function, wherein, the PMC window function is the important way that numerically-controlled machine PMC and CNC system carry out data interaction, numerically-controlled machine PMC is according to the coordinate position of each feed shaft, determine the residing concrete coordinate position section of this coordinate position, numerically-controlled machine PMC obtains the corresponding error compensation value of current location by the mode of tabling look-up from the D address storaging unit, and it is flowed in the R address corresponding with this feed shaft, then the offset in the EMZPS funcall R address is finally realized compensate function as the side-play amount of mechanical origin.
Compare with existing Error Compensation Technology, the present invention takes full advantage of data storage and the computing power of lathe PMC, only need a PC of being furnished with the interactive software that VB writes can realize all lathes on the production line are carried out error compensation and condition monitoring as Master Control Center, realize centralized control, improve compensation efficiency, the economize on hardware cost.Error measure data and the error model of lathe all are kept in the database of Master Control Center PC, are convenient to management and the renewal of error information and error model; The division of labor of each module design task of bucking-out system is clear and definite, finishes under the prerequisite of task separately, carries out each other data interaction by the Ethernet form, has that data rate is fast, stability is high, and is easy to that module connects and the characteristics of expansion; Has simultaneously good online conditions of machine tool monitoring function.
Description of drawings
Fig. 1 is workflow synoptic diagram of the present invention.
Fig. 2 is the process of setting up of error compensation form under a certain temperature conditions.
Fig. 3 is positioning error curve comparison figure before and after the compensation of CK6430 numerically controlled lathe.
Fig. 4 is positioning error curve comparison figure before and after the compensation of CAK4085J numerically controlled lathe.
Fig. 5 is positioning error curve comparison figure before and after the compensation of VMC1000P three shaft vertical machining centers.
Fig. 6 is positioning error curve comparison figure before and after the compensation of VMC1300P three shaft vertical machining centers.
Fig. 7 is VMC22120U 5-axis machining center A shaft angle degree positioning error curve comparison figure.
Embodiment
Below in conjunction with accompanying drawing embodiments of the invention are elaborated, present embodiment has provided detailed embodiment and concrete operating process take technical solution of the present invention as prerequisite, but protection scope of the present invention is not limited to following embodiment.
The NC Machine Error real-time compensation system of team control Network Based of the present invention comprises hardware components and software section.See also Fig. 1, the hardware components of bucking-out system mainly comprises: the built-in ethernet port of Master Control Center PC, router, numerically-controlled machine, temperature sensor, temperature data acquisition card.Wherein, Master Control Center PC is connected with router, and the built-in ethernet port of router and each numerically-controlled machine is connected, and Master Control Center PC realizes carrying out data interaction from different numerically-controlled machines by the IP address of each numerically-controlled machine in the identification team control network; Temperature sensor is connected with the temperature data acquisition card and measures in real time the temperature data of the crucial measuring point of lathe; The temperature acquisition cartoon crosses router and Master Control Center PC carries out bidirectional data interaction.Software section is built in this hardware components, writes under the VB language environment and finishes, and mainly comprises: temperature collect module, error modeling and computing module, team control compensating module and conditions of machine tool network monitoring module.Wherein, temperature collect module is used for preserving the temperature data of the crucial measuring point of lathe that Real-time Collection arrives to be used for follow-up error modeling and displays temperature change curve; Error modeling and computing module are set up error model according to the temperature data of machine tool error measurement data and crucial measuring point, and calculate the error compensation value under the condition of different temperatures; The team control compensating module is responsible for calculating under condition of different temperatures in the team control network error compensation value of each feed shaft in each numerically-controlled machine, generate and constantly update the error compensation value form of each numerically-controlled machine, and with its timesharing, sequentially be transported among each numerically-controlled machine PMC; Conditions of machine tool network monitoring module mainly is responsible for the work state information of each numerically-controlled machine in the monitoring team control network.
Described Master Control Center PC refers to: a computing machine of being furnished with the interactive software of being write by VB, it is the core of whole bucking-out system, have larger storage space and higher arithmetic speed, can store error information, the error model of each numerically-controlled machine in the team control network, the temperature data of crucial measuring point, can calculate quickly the error compensation value under a certain temperature conditions of each lathe, and be transferred to numerically-controlled machine PMC by Ethernet.
Described router connects Master Control Center PC and each numerically-controlled machine in the team control network, automatically selects and the setting route according to the situation of channel, with optimal path, sends sequentially data.
Described built-in ethernet port refers to: the Ethernet interface equipment that digital control system is opened to the user, and directly link to each other with router, this built-in ethernet port can replace with the PCMCIA Ethernet card.Master Control Center PC is connected by the built-in ethernet port of router and lathe or PCMCIA Ethernet card, realizes that data double-way is mutual.Fanuc middle and high end digital control system is furnished with built-in ethernet port usually, and some economical CNC system (as: Fanuc0i mate D) then need to carry out data interaction by optional equipment PCMCIA Ethernet card.
Described temperature sensor refers to: platinum resistance thermometer sensor, PT100, be distributed on the crucial measuring point of numerically-controlled machine temperature, and measurement range is 0 ℃-100 ℃, Measurement Resolution can reach ± and 0.1 ℃.
Described temperature data acquisition card refers to: grind the Adam-6015 type data collecting card that magnificent company produces, have 7 road differential type temperature acquisition passages, effective resolution can reach 16, sampling rate reached as high as for 10 sampled point/seconds, support the connected mode of PT100 two-wire system or three-wire system, support the Ethernet data host-host protocol.
Described temperature collect module refers to: the program module that the temperature data to the temperature sensor that distributes on the crucial measuring point of each numerically-controlled machine in the team control network in the bucking-out system interactive software gathers, stores and shows.Can obtain the temperature data of the crucial measuring point of lathe by PT100 temperature sensor and Adam-6015 temperature data acquisition card, temperature collect module is preserved temperature data, is used for error modeling, the calculating of error compensation value and the real-time demonstration of temperature curve of lathe.
Described error modeling and computing module refer to: according to the different motion topological structure of different numerically-controlled machines in the team control network, the machine tool error data that measure and the temperature data of crucial measuring point are carried out modeling, obtain in the team control network error model of each feed shaft in each numerically-controlled machine.In the error compensation process, this error modeling and computing module can be updated to the temperature data of the crucial measuring point that measures in real time in the error model again, thereby calculate the error compensation value of each feed shaft in each numerically-controlled machine under condition of different temperatures.
Described team control compensating module refers to: the temperature data of the crucial measuring point that interactive software arrives according to the error model of each numerically-controlled machine in the team control network with by the some cycles Real-time Collection, error compensation value, the generation of each feed shaft and constantly update the error compensation value form of each numerically-controlled machine in calculating each numerically-controlled machine under condition of different temperatures, and with its timesharing, sequentially import in the D address storaging unit of each numerically-controlled machine PMC; In order to guarantee the real-time of team control compensation, each lathe PMC reads the coordinate position of each axle in real time in the team control network by window function, and definite residing concrete coordinate position section of this coordinate position, from the D address storaging unit, call error compensation value corresponding to current coordinate position in the mode of tabling look-up, and import in the R address storaging unit; Error compensation value in the EMZPS funcall R address storaging unit of each lathe with its side-play amount as mechanical origin, finally realizes the real-time error compensation of many number of units controlled machine in the team control network.
Described conditions of machine tool network monitoring module refers to: the program module that interactive software is monitored simultaneously to the duty of the many number of units controlled machine in the team control network.The work of numerical control machine status information of monitoring mainly comprises systematic parameter, compensating coefficient, load condition and the warning message etc. of lathe.Interactive software calls the correlation function function in the FOCAS Dynamic Link Libraries that Fanuc company provides, and by mating the IP address of each lathe, obtains the work state information of lathe from each numerically-controlled machine digital control system.
Present embodiment is tested at the team control network that a 5-axis machining center, two three shaft vertical machining centers, two two-axis numerical control lathes form.5-axis machining center adopts Fanuc31i type digital control system, and two three shaft vertical machining centers adopt Fanuc18i type digital control system, and they all have built-in ethernet port, can directly link to each other with router by netting twine; Two numerically controlled lathes adopt Fanuc0i mate TD type digital control system, need to be equipped with the PCMCIA Ethernet card and just can be connected with router.The correlation technique parameter of five lathes is as shown in the table:
The below is that present embodiment adopts described error compensation system to carry out the implementation step of NC Machine Error real-Time Compensation:
The first step, five lathes treating error compensation are set up the team control network.Specifically refer to:
1.1 a 5-axis machining center is connected with router with built-in ethernet port with two three shaft vertical machining centers, two two-axis numerical control lathes is connected with router by the PCMCIA Ethernet card.
1.2 the IP address of five lathes is set, as above shown in the table, because the IP address is the authentication sign of lathe in this team control network, so need to guarantee that the IP address of five lathes is different.
1.3 Master Control Center PC is by the IP address of each lathe of identification, test data connects, and reads the relevant essential information of each lathe, as: digital control system model and the number of axle etc., the team control network is set up and is finished.
Second step, with the surveying instrument such as laser interferometer and temperature sensor the Geometric error and thermal error of five lathes is measured, and set up error unit prime model according to error features and Changing Pattern.For example, wherein the geometric error model of a chassis bed X-axis is
Hot error model is E
T(T
x)=k
TX, n represent the exponent number of geometric error polynomial fitting; X represents X-axis coordinate position, k
TRepresent the coefficient relevant with crucial measuring point temperature.Therefore, under condition of different temperatures the positioning error of X-axis can be expressed as above-mentioned Geometric error and thermal error and, that is: δ
Xx(x, Tx)=E
G(x)+E
T(T
x).Profit uses the same method and can obtain the model tormulation formula of five all feed shaft positioning errors of lathe, and it is kept among the Master Control Center PC.
The temperature data of the 3rd each the crucial measuring point of lathe that goes on foot, will measure in real time is updated in the error model, calculates the error compensation value under condition of different temperatures, and generated error compensation form.The error compensation form that Figure 2 shows that CK6430 numerical controlled lathe Z shaft in the present embodiment is set up process, specifically refers to:
3.1 the travel range of numerical controlled lathe Z shaft is L, is divided into L/p coordinate position section as the interval take p, the travel range L=250mm of Z axis, take p=10mm be divided into as the interval L/p=25 coordinate position section (0-10mm, 10-20mm ..., 240-250mm).The interval p of coordinate position section can determine according to the storage size of D address storaging unit among compensation precision requirement and the lathe PMC.
3.2 the environment temperature in a certain moment and Z axis feed screw nut temperature are updated in the Z axis total error model of being set up by second step, calculate each coordinate position section node (0mm, 10mm ..., 250mm) the error compensation value under this temperature conditions.If measuring the offset of starting point (being the compensate for reference point) is 0, then with the error compensation value of the Nodes that the calculates offset as position in this coordinate position section, will obtain the offset curve of step change type this moment, in the error compensation value write error offset form with all Nodes, just obtained the error compensation value form under this temperature conditions.
3.3 the Model of locating error of other feed shaft is set up process and above-mentioned 3.1,3.2 steps are similar in the team control network, obtains the error model of all numerically-controlled machine feed shafts.
The 4th step, interactive software call the correlation function function in the FOCAS Dynamic Link Libraries, by the Ethernet data transmission mode, to in the D address storaging unit among each lathe PMC in the team control network, wherein each error compensation value accounts for the address of two bytes with the error compensation form timesharing of each feed shaft in each numerically-controlled machine, sequential delivery.
Each lathe PMC obtains the real-time coordinate position of current each feed shaft of lathe in the 5th step, the team control network, and determine to be placed on the error compensation value corresponding with current coordinate position in the D address storaging unit by look-up routine, and by the PLC program this offset is given in the R address corresponding with this feed shaft, then the offset in the EMZPS funcall R address is finally realized the team control compensate function as the side-play amount of mechanical origin.
5.1 the every number of units controlled machine in the team control network needs to write different PLC programs according to the system configuration (as: number of axle, travel range etc.) of oneself.After Master Control Center PC imports to each numerically-controlled machine D address storaging unit with error compensation value form, call voluntarily error compensation value under the corresponding current coordinate position of each feed shaft of this numerically-controlled machine and the crucial measuring point temperature value by each numerically-controlled machine PMC in scan period from the D address storaging unit at ladder diagram, guaranteed like this real-time of network group control.
5.2 in the scan period, obtain each feed shaft current coordinate position by the PMC window function at ladder diagram, wherein, the PMC window function is a kind of important way that lathe PMC and CNC system carry out data interaction.PMC is according to the coordinate position of each feed shaft, determine the residing concrete coordinate position section of this coordinate position, PMC obtains the corresponding error compensation value of current location by the mode of tabling look-up from the D address storaging unit, and it is given in the R address corresponding with this feed shaft, then the offset in the EMZPS funcall R address is finally realized compensate function as the side-play amount of mechanical origin.
The 6th step, rescan the temperature variations of the crucial measuring point of each numerically-controlled machine according to certain scan period, re-started for the 3rd step to the 5th step, constantly each NC Machine Error under the Current Temperatures condition is compensated.
Fig. 3-Figure 7 shows that error comparison diagram before and after five compensation of lathes under a certain temperature conditions in the team control network in the present embodiment.As can be seen from the figure, compensate by network group control, the A Shaft angle positioning error of the positioning error of all translation shaft of two three shaft vertical machining centers and two two-axis numerical control lathes and 5-axis machining center has obtained good compensation effect simultaneously, and the machine tool motion precision all is improved largely.
Claims (7)
1. the NC Machine Error real-time compensation system of a team control Network Based is characterized in that: described bucking-out system comprises hardware components and is built in software section in this hardware; Described hardware components comprises: Master Control Center PC, router, built-in ethernet port or PCMCIA Ethernet card, temperature sensor, the temperature data acquisition card, wherein, Master Control Center PC is connected with router, router is connected with the built-in ethernet port of each numerically-controlled machine, Master Control Center PC is by the IP address of each numerically-controlled machine in the identification team control network, realize carrying out data interaction from different numerically-controlled machines, temperature sensor is connected with the temperature data acquisition card and measures in real time the temperature data of the crucial measuring point of numerically-controlled machine, and the temperature acquisition cartoon crosses router and Master Control Center PC carries out bidirectional data interaction; Described software section comprises: temperature collect module, error modeling and computing module, team control compensating module and conditions of machine tool network monitoring module; Wherein, temperature collect module is preserved the temperature data of the crucial measuring point of lathe that Real-time Collection arrives; Error modeling and computing module are set up error model according to the temperature data of machine tool error measurement data and crucial measuring point, and calculate the error compensation value under the condition of different temperatures; The team control compensating module calculates under condition of different temperatures in the team control network error compensation value of each feed shaft in each numerically-controlled machine, generate and constantly update the error compensation value form of each numerically-controlled machine, and with it timesharing, sequentially be transported among each lathe PMC, the work state information of each numerically-controlled machine in the conditions of machine tool network monitoring module monitors team control network.
2. the NC Machine Error real-time compensation system of team control Network Based according to claim 1, it is characterized in that: described team control compensating module refers to: the temperature data of the crucial measuring point that arrives according to the error model of each numerically-controlled machine in the team control network with by the some cycles Real-time Collection, the error compensation value of each feed shaft in calculating each numerically-controlled machine under condition of different temperatures, generate and constantly update the error compensation value form of each lathe, and with its timesharing, sequentially import in the D address storaging unit of each lathe PMC; Each numerically-controlled machine PMC reads the coordinate position of each feed shaft in real time in the team control network by window function, and definite residing concrete coordinate position section of this coordinate position, from the D address storaging unit, call error compensation value corresponding to current coordinate position in the mode of tabling look-up, and import in the R address storaging unit of PMC; Error compensation value in the EMZPS funcall R address storaging unit of each numerically-controlled machine with its side-play amount as mechanical origin, finally realizes the real-time error compensation of many lathes in the team control network.
3. the NC Machine Error real-time compensation system of team control Network Based according to claim 1, it is characterized in that: described conditions of machine tool network monitoring module refers to: Master Control Center PC carries out the program module of network monitoring simultaneously to the duty of the many number of units controlled machine in the team control network; Described work of numerical control machine status information comprises: the systematic parameter of lathe, compensating coefficient, load condition and warning message; Master Control Center PC calls the correlation function function in the FOCAS Dynamic Link Libraries, by mating the IP address of each lathe, data-transmission mode with Ethernet obtains the work of numerical control machine status information from each numerically-controlled machine digital control system, realize the duty of the many number of units controlled machine in the team control network is carried out network monitoring simultaneously.
4. NC Machine Error real-time compensation method that adopts the team control Network Based that the described system of arbitrary claim in the claims 1 to 3 realizes is characterized in that: may further comprise the steps:
The first step, many number of units controlled machine to be compensated on the production line is set up the team control network;
Second step, with laser interferometer and temperature sensor the Geometric error and thermal error of each numerically-controlled machine in the team control network is measured, set up error model and be kept among the Master Control Center PC according to error features and Changing Pattern;
The 3rd step, when each numerically-controlled machine is implemented error compensation in to the team control network, the temperature data of each crucial measuring point of numerically-controlled machine of measuring in real time is updated in the error model of numerically-controlled machine, calculate the error compensation value under the condition of different temperatures, and generated error offset form;
The 4th goes on foot, calls the correlation function function in the FOCAS Dynamic Link Libraries, by the Ethernet data transmission mode, with the error compensation form timesharing of each feed shaft in each numerically-controlled machine, sequential delivery in the D address storaging unit among each numerically-controlled machine PMC in the team control network;
Each numerically-controlled machine PMC obtains the real-time coordinate position of each feed shaft of today's numerical control lathe in the 5th step, the team control network, and determine to be placed on the error compensation value corresponding with current coordinate position in the D address storaging unit by tabling look-up, and by the PLC program this offset is given in the R address corresponding with this feed shaft, then the offset in the EMZPS funcall R address is finally realized the team control compensate function as the side-play amount of mechanical origin;
The 6th step, gather the temperature variations of the crucial measuring point of each numerically-controlled machine according to the cycle of setting, re-started for the 3rd step to the 5th step, constantly each NC Machine Error under the Current Temperatures condition is compensated.
5. the NC Machine Error real-time compensation method of team control Network Based according to claim 4, it is characterized in that: the described first step specifically refers to: each numerically-controlled machine to be compensated on the production line is connected with Master Control Center PC by router with built-in ethernet port or PCMCIA Ethernet card, the control network of complete, Master Control Center PC is by the IP address of the different numerically-controlled machines of identification, and whether test connects normal in order to carry out bidirectional data interaction.
6. the NC Machine Error real-time compensation method of team control Network Based according to claim 4 is characterized in that: described the 3rd step specifically refers to:
3.1 establishing the travel range of numerically-controlled machine feed shaft is L, is divided into L/p coordinate position section as the interval take p, the interval p of coordinate position section determines according to the storage size of D address storaging unit among compensation precision requirement and the numerically-controlled machine PMC;
3.2 the temperature data in a certain moment is updated in the error model of this feed shaft of being set up by second step, calculate the error compensation value of node under this temperature conditions of each coordinate position section, take the offset of measuring starting point as 0, then with the error compensation value of the Nodes that the calculates offset as position in this coordinate position section, obtain the offset curve of step change type, in the error compensation value write error offset form with all Nodes, obtain the error compensation value form under this temperature conditions;
3.3 set up the error compensation value form of other all feed shafts of numerically-controlled machine in the team control network with the step identical with 3.1 and 3.2.
7. the NC Machine Error real-time compensation method of team control Network Based according to claim 4 is characterized in that: described the 5th step specifically refers to:
5.1 the every number of units controlled machine in the team control network is write different PLC programs according to the system configuration of oneself, after Master Control Center PC imports to each numerically-controlled machine D address storaging unit with error compensation value form, call voluntarily error compensation value under the corresponding current coordinate position of each feed shaft of this numerically-controlled machine and the crucial measuring point temperature value by each numerically-controlled machine PMC in the scan period from the D address storaging unit at ladder diagram;
5.2 at ladder diagram in the scan period, obtain the current coordinate position of each feed shaft by the PMC window function, wherein, the PMC window function is the important way that numerically-controlled machine PMC and CNC system carry out data interaction, numerically-controlled machine PMC is according to the coordinate position of each feed shaft, determine the residing concrete coordinate position section of this coordinate position, numerically-controlled machine PMC obtains the corresponding error compensation value of current location by the mode of tabling look-up from the D address storaging unit, and it is flowed in the R address corresponding with this feed shaft, then the offset in the EMZPS funcall R address is finally realized compensate function as the side-play amount of mechanical origin.
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