CN105137857A - Geometric precision measurement controller - Google Patents
Geometric precision measurement controller Download PDFInfo
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- CN105137857A CN105137857A CN201510458218.6A CN201510458218A CN105137857A CN 105137857 A CN105137857 A CN 105137857A CN 201510458218 A CN201510458218 A CN 201510458218A CN 105137857 A CN105137857 A CN 105137857A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/25—Pc structure of the system
- G05B2219/25257—Microcontroller
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- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Length Measuring Devices With Unspecified Measuring Means (AREA)
Abstract
The invention discloses a geometric precision measurement controller, which comprises a coordinate measuring machine control system. A detection system module and a mechanical system are in communication connection onto the coordinate measuring machine control system; the coordinate measuring machine control system comprises a DSP digital control system and a duel-FPGA parallel logic system; the detection system module comprises a measuring head and a measuring head controller for controlling the measuring head; the coordinate measuring machine control system reads a spatial coordinate value for controlling the detection system module to carry out real-time response and treatment on a measuring head signal, controlling the mechanical system to realize a motion needed by measurement, monitoring the state of a coordinate measuring machine in real time to ensure safety and reliability of the overall system and carrying out geometric error compensation and temperature error compensation on the coordinate measuring machine to improve the measuring precision of the coordinate measuring machine. The geometric precision measurement controller has the advantages of strong information treatment ability, high open degree, convenient motion control and good universality.
Description
Technical field
The present invention relates to a kind of Mersure Controler, specifically a kind of geometry precision measurement controller.
Background technology
In the past few decades, the mankind obtain major scientific and technological achievement, nearly all closely related with precision processing technology.In a sense, conclusive effect is played in the development of precision processing technology to science and technology.Due to Precision Machining require machining precision and surface quality all very high, corresponding detection means must be had, could verify and whether reach technical requirement.And this measuring accuracy is required very strict, require a measuring accuracy magnitude at least higher than machining precision, this will ask the development of Technology of Precision Measurement to have precedence over precision processing technology.Therefore Technology of Precision Measurement is one of key of sophisticated manufacturing development, and major industry developed country all pays much attention to and develop actively Technology of Precision Measurement.
In field of precision measurement, three coordinate measuring machine (CoordinateMeasuringMachine, CMM) is a kind of high efficiency three-dimensional measurement instrument that grows up for nearly 50 years.Three coordinate measuring machine is integrated with the technology such as machinery, electronics, computing machine, software, control, optics, is the instrument of reflection world today field of precision measurement highest level.Its fundamental measurement principle is the measurement measurement of various geometric model be converted into point set coordinate position on model, by software, the coordinate position obtained is calculated the size, shape, relative position etc. of geometric model by certain algorithm.Three coordinate measuring machine can realize on-line checkingi, automatically measure, and online with machining center, realizes reverse-engineering, can realize four axles and measure after adding precise rotating platform.Because its measurement range is large, precision is high, efficiency is high, performance is good, can be connected with flexible manufacturing system, therefore have the title of " measuring center ".Three coordinate measuring machine, as modern large-scale precision instrument, has more and more demonstrated its importance and vast potential for future development.It can carry out the measurement of space three-dimensional size easily.
The core component of three coordinate measuring machine is three coordinate measuring machine control device, it be realize at a high speed, one of the key of high precision Measurement accuracy, decisive role is played to key indexs such as overall measurement precision, kinetic stability.Its ultimate principle is: measuring machine control device is according to predetermined scheme, and the decision-making command driven servomotor made according to upper-level control system arrives certain locus expected with the displacement determined, speed, acceleration and specific forms of motion control and measure device and measures.
There are following two kinds of control devices at present:
1, the measuring machine controller using single-chip microcomputer as core.The major advantage of this quasi-controller is low price, and structure is simple, and the construction cycle is short.Its shortcoming is that single-chip microcomputer motion controller speed is slow, and precision is low.It is large that rack accounts for volume, and every axle needs one piece of control panel, cannot realize multi-axis synchronized control, and almost without control algolithm and feedback mechanism, therefore it is only applicable to some low speed point position motion controls and controls occasion to the less demanding contour motion of track.
2, using special sport control chip PLC as the motion controller of core.This kind of motion controller completes the corresponding function such as process of rate curve planning, servo control algorithm, code device signal by special controlled motion chip.Have fast response time, level of integrated system high, use the advantages such as components and parts are few, good reliability.Its shortcoming be special motion controller owing to being limited by the function of chip, developer cannot introduce complicated control algolithm, and the dirigibility of system development is less, and the price of this type of motion control chip is very high.
Summary of the invention
For solving the problems of the technologies described above, a main aspect of the present invention provides a kind of geometry precision measurement controller, and comprise control system for coordinate measuring machine, on control system for coordinate measuring machine, communication link is connected to detection system module and mechanical system; Described control system for coordinate measuring machine comprises DSP digital control system and double FPGA parallel logic system; Described detection system module comprises gauge head and controls the gauge head controller of gauge head; Control system for coordinate measuring machine reads spatial value, control detection system module and real-time response and process are carried out to gauge head signal, control mechanical system to realize measuring necessary motion, the state of real-time monitoring coordinate measuring machine, to ensure the safety and reliability of whole system, carries out geometric error and temperature error compensation to improve the measuring accuracy of coordinate measuring machine to coordinate measuring machine.
The FPGA that described control system for coordinate measuring machine comprises DSP, communicate to connect with DSP and the 2nd FPGA and the SRAM communicated to connect respectively at DSP and the 2nd FPGA, gauge head trigger pip is passed to the 2nd FPGA by a described FPGA; A described FPGA comprises dual port RAM, gauge head signal processing module, DA translation interface, I/O interface and communication interface; Described 2nd FPGA comprises decoding module, fine interpolator, tachometer signal processing module and grating scale signal processing module.
On described gauge head signal processing module, communication is connected with differential received module, and on described I/O interface, communication link is connected to light-coupled isolation module, and described communication interface is connected to operating grip.
Described dual port RAM is connected with PC by bus interface.
On described fine interpolator, communication is connected to DA conversion and power amplifier module, and described tachometer signal processing module and grating scale signal processing module are all connected to difference channel.
Described mechanical system comprises X, Y, Z tri-axles, each axle is equipped with grating, temperature sensor, limit switch, motor and code-disc.
Described mechanical system also comprises four axle-revolving shaft C axle, realizes four axle UNICOMs and controls.
Described DSP digital signal processing completes following data operation and Real Time Control Function:
Motion control function: Comlex-locus planning completes measurement Error Compensation with multiaxis cooperation control, position control, real-time interpolation computing, servocontrol filtering;
Trigger measuring-signal processing capacity: when gauge head is triggered, receive FPGA latch three axle grating readings this moment, and carry out error compensation calculating;
Scanning survey controlling functions: the data that process scanning feeler gathers, and control survey machine is according to piece surface shape, keeps the mode of scanning contact to move;
Communication function: realized and the data real-time exchange of host computer and communication, the transmission of steering order and the feedback of machining state by the both-end RAM of FPGA inside;
Speed controlling function: utilize acceleration and deceleration algorithm, realizes the easy motion of system;
Parameter setting function: allow each kinematic parameter of user to control system to carry out adjustment in real time and amendment;
Subsidiary function: the general purpose I/O discrete magnitude signal receiving FPGA;
Described FPGA realizes multiple signals parallel processing:
The interpolation signal that DSP sends after treatment output motor driver produces each spindle motor of pulse drive signal; The tachometer signal receiving the differential feedback that motor produces processes, and sends to DSP to form closed-loop control; Receive grating displacement sensor signal and record real time position, having during trigger pip and carry out raster data latch; Receive gauge head signal and process in real time, when reaching trigger condition, send to DSP to carry out measurement of correlation operation; Receive operating grip signal carry out processing and send to DSP to carry out Non-follow control measurement; The real-time communication of DSP digital signal processing module and host computer is realized by two-port RAM; The discrete I/O signal received through light-coupled isolation outputs to DSP process.
Technical scheme of the present invention overcomes shortcoming of the prior art, also has that the synchronous easy motion of three axles, anti-external electromagnetic interference, signal to noise ratio (S/N ratio) are high, measuring accuracy high simultaneously.
Accompanying drawing explanation
Fig. 1 is that structure of the present invention shows block diagram;
Fig. 2 is control system for coordinate measuring machine structured flowchart.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further described.It is pointed out that these illustrate just exemplary, the present invention is not construed as limiting.
As illustrated in fig. 1 and 2, a kind of geometry precision measurement controller, comprise control system for coordinate measuring machine, on control system for coordinate measuring machine, communication link is connected to detection system module and mechanical system, mechanical system comprises X, Y, Z tri-axles, each axle is equipped with grating, temperature sensor, limit switch, motor and code-disc, also can mix the 4th axle, i.e. revolving shaft C axle, realizes four axle UNICOMs and controls; Control system for coordinate measuring machine comprises DSP digital control system and double FPGA parallel logic system; Detection system module comprises gauge head and controls the gauge head controller of gauge head.
The FPGA that control system for coordinate measuring machine comprises DSP, communicate to connect with DSP and the 2nd FPGA and the SRAM communicated to connect respectively at DSP and the 2nd FPGA, gauge head trigger pip is passed to the 2nd FPGA by a FPGA.FPGA programmable gate array realizes three synchronous spindle motor controls, encoder feedback, measuring-signal process, makes that three axles are synchronously stable to move by intended trajectory.
One FPGA comprises dual port RAM, gauge head signal processing module, DA translation interface, I/O interface and communication interface; On gauge head signal processing module, communication is connected with differential received module, and on I/O interface, communication link is connected to light-coupled isolation module, and communication interface is connected to operating grip, and dual port RAM is connected with PC by bus interface.Two-port RAM achieves the real-time communication of DSP digital signal processing module and upper PC, improves DSP resource utilization.Light-coupled isolation module suppresses spike pulse and various noise jamming effectively, thus the signal to noise ratio (S/N ratio) on process channel is greatly improved.
2nd FPGA comprises decoding module, fine interpolator, tachometer signal processing module and grating scale signal processing module.On fine interpolator, communication is connected to DA conversion and power amplifier module, and tachometer signal processing module and grating scale signal processing module are all connected to difference channel.Difference signal pair external electromagnetic interference is hyperimmunization, especially has good suppression to common mode interference.
DSP digital signal processing completes following data operation and Real Time Control Function:
Motion control function: Comlex-locus planning completes measurement Error Compensation with multiaxis cooperation control, position control, real-time interpolation computing, servocontrol filtering;
Trigger measuring-signal processing capacity: when gauge head is triggered, receive FPGA latch three axle grating readings this moment, and carry out error compensation calculating;
Scanning survey controlling functions: the data that process scanning feeler gathers, and control survey machine is according to piece surface shape, keeps the mode of scanning contact to move;
Communication function: realized and the data real-time exchange of host computer and communication, the transmission of steering order and the feedback of machining state by the both-end RAM of FPGA inside;
Speed controlling function: utilize acceleration and deceleration algorithm, realizes the easy motion of system;
Parameter setting function: allow each kinematic parameter of user to control system to carry out adjustment in real time and amendment;
Subsidiary function: the general purpose I/O discrete magnitude signal receiving FPGA;
FPGA realizes multiple signals parallel processing:
The interpolation signal that DSP sends after treatment output motor driver produces each spindle motor of pulse drive signal; The tachometer signal receiving the differential feedback that motor produces processes, and sends to DSP to form closed-loop control; Receive grating displacement sensor signal and record real time position, having during trigger pip and carry out raster data latch; Receive gauge head signal and process in real time, when reaching trigger condition, send to DSP to carry out measurement of correlation operation; Receive operating grip signal carry out processing and send to DSP to carry out Non-follow control measurement; The real-time communication of DSP digital signal processing module and host computer is realized by two-port RAM; The discrete I/O signal received through light-coupled isolation outputs to DSP process.
Control system for coordinate measuring machine controls to form primarily of DSP digital signal processing and FPGA parallel logic, realize the multi-shaft interlocked control of high precision, gauge head generating date, measuring machine status real time monitor control (limit travel, move chain, air pressure monitor, Z axis balance, probe are changed, probe application), trigger pip image data and gauge head protection, with the control of the aspect such as host computer real-time communication and safety control function; It has each shifting axle system single shaft and multi-shaft interlocked high-precision servo controls, and the three-dimensional mainly comprising control device only has X, and Y, Z tri-axles, can also join the 4th axle, i.e. revolving shaft C axle, realize 4 axle coordinated signals.
Detection system module generally becomes an independently system together with gauge head system, primarily of survey seat, gauge head body and point gauge module and some annexes composition.Its major function is that measurement triggering controls, and comprises dynamometry control, measurement triggering, detection micro-displacement sensing, temperature sensing and correction-compensation, scanning process control etc.The function, work efficiency, precision etc. of its performance and three coordinate measuring machine are closely related.
Along with the development of DSP (digital signal processing) and FPGA (field programmable gate array) technology, the digital control system adopting DSP to add FPGA structure demonstrates its superiority gradually: can play DSP fast operation, addressing mode is flexible, communication mechanism is powerful advantage on the one hand, FPGA can be utilized on the other hand to realize various logic in hardware control, be conducive to system integration and stability, and there is flexible structure, be easy to safeguard and be convenient to the features such as expansion.Therefore target of the present invention designs and develops a measuring machine control system based on DSP and FPGA, and the data adopting data bus to realize PC and DSP are transmitted, and to improve message transmission rate, ensures the real-time of digital control system.Information processing capability powerful for PC and open feature combine with the motion control capabilities of motion control card by it, have the advantages that information processing capability is strong, degree of opening is high, convenient control of motion, versatility are good.
The above is only the preferred embodiment of the present invention; be noted that for those skilled in the art; under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (9)
1. a geometry precision measurement controller, is characterized in that: comprise control system for coordinate measuring machine, communication link is connected to detection system module and mechanical system on control system for coordinate measuring machine; Described control system for coordinate measuring machine comprises DSP digital control system and double FPGA parallel logic system; Described detection system module comprises gauge head and controls the gauge head controller of gauge head; Control system for coordinate measuring machine reads spatial value, control detection system module and real-time response and process are carried out to gauge head signal, control mechanical system to realize measuring necessary motion, the state of real-time monitoring coordinate measuring machine, to ensure the safety and reliability of whole system, carries out geometric error and temperature error compensation to improve the measuring accuracy of coordinate measuring machine to coordinate measuring machine.
2. a kind of geometry precision measurement controller according to claim 1, it is characterized in that: described control system for coordinate measuring machine comprises DSP, the FPGA that communicates to connect with DSP and the 2nd FPGA and the SRAM that communicates to connect respectively at DSP and the 2nd FPGA, and gauge head trigger pip is passed to the 2nd FPGA by a described FPGA; A described FPGA comprises dual port RAM, gauge head signal processing module, DA translation interface, I/O interface and communication interface; Described 2nd FPGA comprises decoding module, fine interpolator, tachometer signal processing module and grating scale signal processing module.
3. a kind of geometry precision measurement controller according to claim 2, it is characterized in that: on described gauge head signal processing module, communication is connected with differential received module, on described I/O interface, communication link is connected to light-coupled isolation module, and described communication interface is connected to operating grip.
4. a kind of geometry precision measurement controller according to claim 2, is characterized in that: described dual port RAM is connected with PC by bus interface.
5. a kind of geometry precision measurement controller according to claim 2, is characterized in that: on described fine interpolator, communication is connected to DA conversion and power amplifier module, and described tachometer signal processing module and grating scale signal processing module are all connected to difference channel.
6. a kind of geometry precision measurement controller according to claim 1, is characterized in that: described mechanical system comprises X, Y, Z tri-axles, each axle is equipped with grating, temperature sensor, limit switch, motor and code-disc.
7. a kind of geometry precision measurement controller according to claim 1, is characterized in that: described mechanical system also comprises four axle-revolving shaft C axle, realizes four axle UNICOMs and controls.
8. a kind of geometry precision measurement controller according to claim 2, is characterized in that: described DSP digital signal processing completes following data operation and Real Time Control Function:
Motion control function: Comlex-locus planning completes measurement Error Compensation with multiaxis cooperation control, position control, real-time interpolation computing, servocontrol filtering;
Trigger measuring-signal processing capacity: when gauge head is triggered, receive FPGA latch three axle grating readings this moment, and carry out error compensation calculating;
Scanning survey controlling functions: the data that process scanning feeler gathers, and control survey machine is according to piece surface shape, keeps the mode of scanning contact to move;
Communication function: realized and the data real-time exchange of host computer and communication, the transmission of steering order and the feedback of machining state by the both-end RAM of FPGA inside;
Speed controlling function: utilize acceleration and deceleration algorithm, realizes the easy motion of system;
Parameter setting function: allow each kinematic parameter of user to control system to carry out adjustment in real time and amendment;
Subsidiary function: the general purpose I/O discrete magnitude signal receiving FPGA.
9. a kind of geometry precision measurement controller according to claim 2, is characterized in that: described FPGA realizes multiple signals parallel processing:
The interpolation signal that DSP sends after treatment output motor driver produces each spindle motor of pulse drive signal; The tachometer signal receiving the differential feedback that motor produces processes, and sends to DSP to form closed-loop control; Receive grating displacement sensor signal and record real time position, having during trigger pip and carry out raster data latch; Receive gauge head signal and process in real time, when reaching trigger condition, send to DSP to carry out measurement of correlation operation; Receive operating grip signal carry out processing and send to DSP to carry out Non-follow control measurement; The real-time communication of DSP digital signal processing module and host computer is realized by two-port RAM; The discrete I/O signal received through light-coupled isolation outputs to DSP process.
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Cited By (1)
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CN110553604A (en) * | 2019-10-16 | 2019-12-10 | 合肥学院 | water turbine blade blank profile measuring and machining allowance analyzing method |
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Application publication date: 20151209 |