CN1804743A - Control system and method for economical NC machine tool - Google Patents
Control system and method for economical NC machine tool Download PDFInfo
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- CN1804743A CN1804743A CN 200510022276 CN200510022276A CN1804743A CN 1804743 A CN1804743 A CN 1804743A CN 200510022276 CN200510022276 CN 200510022276 CN 200510022276 A CN200510022276 A CN 200510022276A CN 1804743 A CN1804743 A CN 1804743A
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Abstract
The invention relates to a control system and method of the digital control machine which is characterized in that it uses the contact screen to displace the CNC, wherein the contact screen comprises a data input module, a data storage module and a data processing compute module; it uses the communicating interface to communicate with the PLC to achieve the coordinate axis location control with the locating accuracy 0.002mm; the contact screen also comprises a switch module, a choosing module, a monitoring module and a data following display module.
Description
Technical field
The present invention relates to the control system and the method for a kind of control system of lathe, particularly a kind of economical NC machine tool.
Background technology
Numerically-controlled machine adopts the integrated technology of Control Software, and PLC is integrated in the CNC digital control system.PLC is as the logic control center of the every function of numerically-controlled machine, and it will carry out the logic ordering from various motions and the function command of CNC, make they can be exactly, the safe operation of harmonious orderly ground; To send CNC to from the various information and the duty of lathe simultaneously, make CNC can send further steering order timely and accurately, the speed command that servo-drive system acceptance provides respectively each coordinates of motion axle from CNC, regulate the rotation of output drive signal driving servomotor through speed and electric current (torque), realize the motion of machine coordinates axle, accept feedback speed signal simultaneously and implement speed closed loop control, communicate by letter with CNC, circulate a notice of current duty and accept the control of CNC by PLC.The integrated software interface of taking of PLC and CNC is realized, system specifies its fixing storage address respectively with the two various communication information, by system the information state of all addresses is monitored in real time, according to the present state of each interface signal analysis and judgement in addition, make further control command in view of the above, finish control motion or function.Because the Highgrade integration of digital technology, many system programs and user program all Be Controlled hardware manufacturing producer are solidificated in the system, sell with system hardware, have not only increased equipment cost, and limited subscriber oneself exploitation, reduced the ability of the system integration.The Highgrade integration of digital technology, software decision hardware has limited the user and has selected the ability of well-formedness price ratio digital control system for use according to the lathe characteristics, can not give full play to the advantage of each system hardware.
Economical NC machine tool has been owing to only be equipped with PLC, is difficult to realize the positioning control to coordinate axis, often needs to set up peripheral circuit, could realize the accurate control of coordinate axis kinematic parameter (apart from, speed).
In addition, the single-chip microcomputer of existing machine tool numerical control system system employing or computing machine (MMC) are realized control as host computer.Though solved real-time control like this to plant equipment, but the peripheral circuit complexity needs to rely on the interface of guidance panel as man-machine exchange, has hardware devices such as a large amount of action buttons, switch and pilot lamp usually, also need the operator to import the instruction of more complicated, it is cumbersome to operate, and the hardware device performance is not good, and failure rate is higher, the poor stability of system, maintenance workload is big, and the trouble spot is bad searches, and safeguards inconvenient.
To sum up said, modern numerically-controlled machine also need improve on some following: is improving under the prerequisite of numerically-controlled machine bearing accuracy (1), adopts software programming to replace hardware circuit, realizes hardware button-free operationalization, reduces peripheral complicated circuit, reduces failure rate.(2) make the program of designer, accelerate the ability of technical renovation, reduce cost performance, and do not rely on the hardware proportioning ability of digital control system itself according to the suitable body lathe of different lathe own characteristic exploitations.(3) do not rely on drawn game aspect the system integration and be limited to the restriction of software to machine tool development, the user can independent assortment hardware realizes the control to numerically-controlled machine.
Summary of the invention
Purpose of the present invention provides a kind of have accurate location and real-time monitoring and control, realizes the button-free operation on hardware, but aspect software a kind of economical CNC system of user's free development and utilization.For achieving the above object, the present invention adopts following technical solution:
A kind of control system of economical NC machine tool comprises lathe servo-drive system, lathe servomotor and the PLC that this servo-drive system is controlled; It is characterized in that also comprise the touch-screen by communication interface and plc communication, described touch-screen comprises:
-data input module is used to import, revise the parameter value and the operational order of controlled parameter, reads the operation interface of touch-screen;
-data memory module is used for storage input, output data;
-data processing computing module is used for input, output parameter data are handled, calculated; Comprise the coding computing of input signal; The decoding computing of output signal.
Described PLC comprises:
The data shift unit is used for respectively PLC inner high speed numeration pulse value, data memory module data value, control routine parameter value being displaced to the data block that the PLC programming distributes in real time according to operational order;
Data storage cell is used to store the data that the shift unit transmission comes;
The Data Detection unit is used for the current motion state parameters value of real-time detection coordinates axle, comprises distance, velocity amplitude, and the control mode parameter value;
The data comparing unit is used for the setting value of the current motion state parameters value of the detected coordinate axis of detecting unit, control mode parameter value and touch-screen memory module is compared;
The data computation unit is used for calculating according to comparative result the value of control signal, the quantitative value of the pulse that promptly counts;
The control mode determining unit is used for according to the detected control mode data in Data Detection unit, determines forward and backward operation and locator meams;
The control signal output unit is used to export the direction pulse of having determined control mode and the numeration pulse signal of velocity magnitude.
Described touch-screen also comprises:
-switch module is used for the circuit that the on coordinate axis is moved;
-select module, be used to select, the control mode of switching controls coordinate axis motion and the operation interface of touch-screen;
-monitor module is used for the duty of indicating circuit;
-data are followed display module, are used to monitor lathe actual motion situation, and show the actual operation parameters value.
The method of the above-mentioned control system control of a kind of usefulness coordinate axis movement position comprises step:
-signal input step: by the characteristic ginseng value and the operations of operators instruction of the input of the keyboard on touch-screen workpiece;
-input signal treatment step: the processing computing module by touch-screen is handled, is calculated input signal; Input signal is carried out the unit system convert and encode, convert digital signal corresponding to;
-the first storing step deposits digital signal in the memory module of touch-screen;
-shift step: the shift unit by PLC is displaced to PLC inner high speed numeration pulse value, data memory module data value, control routine parameter value in the data block of PLC programming distribution respectively in real time according to operational order;
-the second storing step, the data that the shift unit transmission is next deposit the storage unit of PLC in;
-detect step, by the current distance parameter value and the control mode parameter value of the real-time detection coordinates axle of PLC detecting unit;
-comparison step is compared the setting value in detected coordinate axis current distance parameter value and control mode parameter value and the touch-screen memory module by the PLC comparing unit;
-calculation procedure calculates the value of control signal, the quantitative value of the pulse that promptly counts according to comparative result;
-control mode determining step according to the detected control mode data in Data Detection unit, is determined forward and backward operation and locator meams;
-control signal output step is delivered to the direction pulse signal of control mode and the numeration pulse signal of velocity magnitude in the servo-drive system.
Technique effect:
One, owing to adopt touch-screen, played four aspect effects simultaneously:
1, replaced the CNC digital control system, the CPU of touch-screen with data or the signal instruction received decode, coding, computing, send the steering order of the movement instruction and the various lathe functions of various needs then in an orderly manner, realize accurately location, precision can reach 0.002mm, obtain the technique effect equal, reduced system cost significantly with CNC.
2, replaced the human-machine operation panel (MMC) in the numerically-controlled machine, the user can be according to the needs of lathe characteristics, the control picture that oneself completes and need.And GENERAL TYPE numerically-controlled machine human-machine operation picture is solidificated in the system by manufacturer, sells as entire system, has increased design cost like this, also is unfavorable for the secondary development of designer to operation screen.
3, have the formulation data card, can realize that data storage and transmission are had memory function to the lathe data locking, for PLC operation control program provides necessary condition.
4, realize hardware button-free operationalization on the mode of operation, lathe all operations device comprises that keyboard all is to simulate realization by the programming personnel in software, thereby thoroughly eliminated the hardware device in the secondary system circuit, reduced failure rate, strengthened the stability of system.
Two, owing to adopt the PLC that has the pulse that counts at a high speed, make it can move the following control program of numeration at a high speed that needs: the coordinate axis kinematic parameter detects in real time; Send speed and position command; Regulate the output control signal; Accept feedback speed signal and implement the data processing of speed closed loop control signal to servo-drive system; Thereby finally realize the accurate control of coordinate axis kinematic parameter.
Description of drawings
Fig. 1 is the structure and the process flow diagram of this control system
Embodiment
Referring to Fig. 1: the present invention includes touch-screen 10, PLC Programmable Logic Controller 20, lathe servo-drive system 30 three parts.
Touch-screen 10 is that the user carries out interactive window, and all operation interfaces all are that programming personnel oneself design is finished, and it has machine operation, and state shows that data are followed, functions such as data storage and calculating.Its concrete control section mainly comprises function selecting module 1, data input module 2 (keyboard), and data computation module 3 (CPU), data memory module 4, data are followed module 5, switch control module 6, state monitoring module 7; Wherein, except that data computation module 3 (CPU) and data memory module 4 are the hardware, all the other all are software.
The mode of programming configuration is at first made function selecting module 1, and the user can free blocked operation interface, satisfies out-of-alignment control.Make data input device, be used for the digital or alphabetical input and the supervisory keyboard of deletion.There has been data input device that the module 3 of pair data computation just must be arranged, data computation module is carried out mathematical computations to position command and the speed command that the operator sends, carry out machine code work, be encoded into the machine language code that PLC can discern, be sent to then in the next stage module; Also can carry out decoding work, send into data and follow module 5 and monitor in real time the actual range that the PLC control system feeds back to.Touch screen control system can carry out verification and be stored in data memory module 4 language of coding, data storage is a formulation data card functions peculiar, it can store a large amount of control datas and information, carry out data transmission and exchange, all data and the exchange of information are that the network service by touch-screen and PLC controller realizes.Switch control module 6 is used for the on/off circuit, the motion control of control coordinate axis.State monitoring module 7 is to the monitoring of PLC output state.
PLC controller 20 is nerve centers of control system, and it not only carries out logical process to external input signal, and internal data is stored, and detects, and relatively, calculates etc.Its major control partly comprises data shift unit 11, Data Detection unit 12, data comparing unit 13, data computation unit 14, data storage cell 15, Input Control Element 16, control mode unit 17, output control unit 18.In order to guarantee control accuracy, system adopts the PLC of the pulse that counts at a high speed, for example the PLC controller of the FP of Panasonic ∑ series.
Servo-drive system 30 is third parts of this control system, comprises servo drive system 31, motor 32, scrambler 33.
The principle of work of this control system is as follows:
When PLC with after touch-screen is communicated by letter fully, the data in the data shift unit 11 identification touch-screen formulation data cards of PLC program detect in real time according to the needs of program and to be sent in the data storage cell 15 of PLC, and by the machine code storage wherein.
The PLC program can be sent instruction and give Data Detection unit 12, the 12 meetings requirement different in Data Detection unit according to system, detect instructions such as speed that the operator need move, distance and mode of operation, and accept lathe actual range value of feedback, be stored in respectively in the different addresses.Speed value directly is sent to data computation unit 14, and the mode of operation command value is directly sent into control mode unit 17, and detected actual distance value feeds back in the data computation module 3 and decodes, and follows in the module 5 in data and to show.
Data comparing unit 13 finds 12 pairs of lathe actual ranges of detecting unit and setpoint distance data block storage addresses by addressing, begin to compare, when actual range than setpoint distance hour, data computation unit 14 is effective with control mode unit 17.When actual range is bigger than setpoint distance, data comparing unit 13 feeds back to detecting unit 12 again to the numerical value that detects, and then relatively, when satisfying condition, stopping comparison, selecting suitable comparison order in the data comparing unit 13 for use is the important assurance that improves machine tool accuracy.
Data computation unit 14, when the comparative result of data comparing unit 13 was judged as "Yes", data computation unit 14 began to accept the speed command that Data Detection unit 12 sends, and began to calculate PLC and need trigger how many pulse numbers.
Control mode unit 17, when the comparative result of data comparing unit 13 is judged as "Yes", control mode unit 17 begins to accept the control mode instruction that Data Detection unit 12 sends, when the logical order that detects switch control module 6 and Input Control Element 16 when system all satisfies service condition, activate control mode unit 17, the pulse of PLC outbound course.
Output control unit 18 is accepted the direction pulse that the data computation unit 14 speed command umber of pulse that produces and control mode unit 17 are produced, and drives the servo-drive system operation.
Servo-drive system 30 has play a part important aspect the location, digital pulse coding device 33 is as the position detection element, it is measured indirectly to machine tool position, measurement feedback is returned in the servo-drive system, this system feeds back in the DATA REASONING unit 12 again, and by revising servo driving parameter unit command pulse number, the speed of corresponding motor and displacement are realized accurately location.
Coordinate axis position control process comprises the steps:
1. enter the selected coordinate axis in touch screen operation interface,, set the distance and the initial velocity value of coordinate axis motion by data input module 2.
2. handle computing module 3 by touch screen data, initial velocity value and distance setting value to input are calculated and are encoded, be stored in the formulation data piece of memory module 4, actual distance value that the PLC system feedback is returned and the decoding of travelling speed value are imported data into and are followed in the module 5, show in real time and monitor them.
3.PLC data shift unit 11, timely and accurately various information and data in the formulation data piece of memory module 4 are sent to the storage unit 15 of PLC by addressing, realize the function of storage unit 15 storage data, data memory.Its data that pass comprise, speed data, position data, the pulse data that PLC inner high speed register is sent out, data such as direction control.
4. the actual range data-signal that feeds back to of 12 pairs of storage unit 15 of detecting unit data of being stored and servo-drive system 31 is handled and is detected classification, and they are sent in the different control data pieces.
5. the actual range of 13 pairs of detecting units of comparing unit, 12 distribution and the position of setpoint distance compare.When comparative result was judged as "Yes", speed calculation and direction calculating control were effective, and speed data piece and directional data block instruction can be imported into the control corresponding unit in system; Otherwise when comparative result was judged as "No", speed and direction control were invalid, and instruction can not imported the control corresponding unit into.
6. the speed command that detecting unit 12 provides distribution is accepted in data computation unit 14, real-time computing velocity changing value, the numeration pulse (YO) that produces corresponding frequencies.
7. control mode determining unit 17 is accepted the direction command pulse that detecting unit 12 provides distribution, produces corresponding direction gating pulse (YI) by gauge tap module 6.
8. output control unit 18 pulse (YO), direction pulse (YI) the input servo drive system 31 that will count is controlled it.
An outstanding feature of the present invention is to adopt touch-screen, and it plays four aspect effects simultaneously: 1, replaced the human-machine operation panel MMC in the numerically-controlled machine, the user can be according to the needs of lathe characteristics, the control picture that oneself completes and need.And GENERAL TYPE numerically-controlled machine human-machine operation picture is solidificated in the system by manufacturer, sells as entire system, has increased design cost like this, also is unfavorable for the secondary development of designer to operation screen.2, replace digital control system CNC with touch-screen, the CPU of touch-screen with data or the signal instruction received decode, coding, computing, send the steering order of the movement instruction and the various lathe functions of various needs then in an orderly manner, realize accurately location.3, have the formulation data card, can realize that data storage and transmission are had memory function to the lathe data locking.4, the device in the operating system secondary circuit all is to simulate realization by the programming personnel in software, thoroughly eliminates hardware device, reduces failure rate, enhanced system stability.
The PLC of function, effect and conventional numerically-controlled machine that another outstanding feature of the present invention is PLC is incomplete same.PLC of the present invention accepts the various information after touch-screen CPU handles, and in PLC, detect in real time, send speed and position command, regulate output drive signal and drive the servomotor rotation, realize the motion of machine coordinates axle, and accept feedback speed signal is implemented the speed closed loop control signal to servo-drive system deal with data.And conventional numerically-controlled machine (PLC+CNC), its PLC is as the logic control center of the every function of numerically-controlled machine, it will carry out the logic ordering from various motions and the function command of CNC, make they can be exactly, the safe operation of harmonious orderly ground; To send CNC to from the various information and the duty of lathe simultaneously, make CNC can send further steering order timely and accurately, the speed command that servo-drive system acceptance provides respectively each coordinates of motion axle from CNC, regulate the rotation of output drive signal driving servomotor through speed and electric current (torque), realize the motion of machine coordinates axle, accept feedback speed signal simultaneously and implement speed closed loop control, it is also communicated by letter with CNC by PLC, circulates a notice of current duty and accepts the control of CNC.
Claims (3)
1. the control system of an economical NC machine tool comprises lathe servo-drive system and the PLC that this servo-drive system is controlled; It is characterized in that also comprise the touch-screen by communication interface and plc communication, described touch-screen comprises:
-data input module is used to import, revise the parameter value and the operational order of controlled parameter, reads the operation interface of touch-screen;
-data memory module is used for storage input, output data;
-data processing computing module is used for input, output parameter data are handled, calculated; Comprise the coding computing of input signal; The decoding computing of output signal;
Described PLC comprises:
-data shift unit is used for respectively PLC inner high speed numeration pulse value, data memory module data value, control routine parameter value being displaced to the data block that the PLC programming distributes in real time according to operational order;
-data storage cell is used to store the data that the shift unit transmission comes;
-Data Detection unit is used for the current motion state parameters value of real-time detection coordinates axle, comprises distance, velocity amplitude, and the control mode parameter value;
-data comparing unit is used for the setting value of the current motion state parameters value of the detected coordinate axis of detecting unit, control mode parameter value and touch-screen memory module is compared;
-data computation unit is used for calculating according to comparative result the value of control signal, the quantitative value of the pulse that promptly counts;
-control mode determining unit is used for according to the detected control mode data in Data Detection unit, determines forward and backward operation and locator meams;
-control signal output unit is used to export the direction pulse of having determined control mode and the numeration pulse signal of velocity magnitude.
2. control system according to claim 1 is characterized in that, described touch-screen also comprises:
-switch module is used for the circuit that the on coordinate axis is moved;
-select module, be used to select, the control mode of switching controls coordinate axis motion and the operation interface of touch-screen;
-monitor module is used for the duty of indicating circuit;
-data are followed display module, are used to monitor lathe actual motion situation, and show the actual operation parameters value.
3. method with the described control system of claim 1 control coordinate axis movement position comprises step:
-signal input step: by the characteristic ginseng value and the operations of operators instruction of the input of the keyboard on touch-screen workpiece;
-input signal treatment step: the processing computing module by touch-screen is handled, is calculated input signal; Input signal is carried out the unit system convert and encode, convert digital signal corresponding to;
-the first storing step deposits digital signal in the memory module of touch-screen;
-shift step: the shift unit by PLC is displaced to PLC inner high speed numeration pulse value, data memory module data value, control routine parameter value in the data block of PLC programming distribution respectively in real time according to operational order;
-the second storing step, the data that the shift unit transmission is next deposit the storage unit of PLC in;
-detect step, by the current distance parameter value and the control mode parameter value of the real-time detection coordinates axle of PLC detecting unit;
-comparison step is compared the setting value in detected coordinate axis current distance parameter value and control mode parameter value and the touch-screen memory module by the PLC comparing unit;
-calculation procedure calculates the value of control signal, the quantitative value of the pulse that promptly counts according to comparative result;
-control mode determining step according to the detected control mode data in Data Detection unit, is determined forward and backward operation and locator meams;
-control signal output step is delivered to the direction pulse signal of control mode and the numeration pulse signal of velocity magnitude in the servo-drive system.
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| CN101488018B (en) * | 2008-01-18 | 2010-12-22 | 兄弟工业株式会社 | Numeric control apparatus |
| CN101364088B (en) * | 2008-09-12 | 2010-12-29 | 深圳市合信自动化技术有限公司 | Industrial human-machine interface variable accessing method and system |
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| CN102350632A (en) * | 2011-09-29 | 2012-02-15 | 惠州Tcl移动通信有限公司 | Screw locking machine |
| CN101339428B (en) * | 2007-07-02 | 2012-06-13 | 发那科株式会社 | Numerical controller controlling acceleration and deceleration of respective control axes up to command speeds |
| CN103186113A (en) * | 2011-12-28 | 2013-07-03 | 赐福科技股份有限公司 | Numerical control machine tool and control method thereof |
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| CN101488018B (en) * | 2008-01-18 | 2010-12-22 | 兄弟工业株式会社 | Numeric control apparatus |
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| CN103186113A (en) * | 2011-12-28 | 2013-07-03 | 赐福科技股份有限公司 | Numerical control machine tool and control method thereof |
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Application publication date: 20060719 Assignee: Dongfang (Guangzhou) Heavy Machinery Co., Ltd. Assignor: Dongfang Turbine Co., Ltd., Dongfang Electric Group Contract record no.: 2010440000162 Denomination of invention: Control system and method for economical NC machine tool Granted publication date: 20081105 License type: Exclusive License Record date: 20100210 |