CN208766517U - A kind of numerically-controlled machine tool heat error compensation control device - Google Patents
A kind of numerically-controlled machine tool heat error compensation control device Download PDFInfo
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- CN208766517U CN208766517U CN201820124043.4U CN201820124043U CN208766517U CN 208766517 U CN208766517 U CN 208766517U CN 201820124043 U CN201820124043 U CN 201820124043U CN 208766517 U CN208766517 U CN 208766517U
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Abstract
The utility model discloses a kind of numerically-controlled machine tool heat error compensation control devices, including embedded main control unit, heat error compensation computing unit, data acquisition process unit, temperature detecting unit, position detection unit and phototube coupling unit.The numerically-controlled machine tool is in heat error compensation control device, temperature detecting unit and position detection unit are all made of wireless transmission method and are connected with data acquisition process unit, so that it is few to be routed simple, easy to connect and occupancy interface between multiple temperature detecting units, multiple position detection units and data acquisition process unit；Compensation Thermal Error is by inputting numerical control device again after phototube coupling unit to complete the heat error compensation of lathe, it avoids due to embedded main control unit small volume and when machine tool mechanical bulky dimensions, so that vibration, noise and electromagnetic interference are generated in process, so that the safety and stability of thermal compensation device controller operation be effectively ensured.
Description
Technical field
The present invention relates to numerical control machine tool technique field more particularly to a kind of numerically-controlled machine tool heat error compensation control devices.
Background technique
Machine tool thermal error be due to the effect of external heat source in lathe and make lathe building block occur thermal deformation caused by,
More accurate, high speed, large-scale lathe, the ratio that Thermal Error accounts for overall error are bigger.Thermal Error not only makes under the dimensional accuracy of product
Drop, and because productivity of the size adjusting to product generates strong influence.Studies at home and abroad show that Thermal Error is numerically-controlled machine tool
One of maximum error source accounts for the 40%-70% of overall error.It can be seen that effectively controlling Thermal Error, the effective numerical control machine of exploitation
Bed thermal error compensating device has great significance to numerically-controlled machine tool machining accuracy is improved.
Currently, there are mainly two types of the modes of the Thermal Error of reduction numerical control processing apparatus: error prevents method and error compensation method.
Error prevents method to rely on the method for improving the improvement hardware such as numerical control processing apparatus structure design or is directly realized by the control to temperature
It makes to reduce Thermal Error, this method can reduce heat source temperature rise, balanced temperature rise to a certain extent and reduce numerical control processing dress
Thermal deformation is set, but will increase the cost that structure designs and manufactures.Error compensation method is exactly to obtain numerical control by analysis modeling to add
Then the error estimation that tooling is set utilizes different method compensation appropriate, eliminate or reduce the error of system, be it is a kind of both
The means of effective and economic raising numerical control processing apparatus machining accuracy.Currently, the method for heat error compensation has become both at home and abroad
The important research field of modern precision engineering.However, there are the following problems for existing Error Compensation Technology:
(1) it is arranged with position sensor using parallel form due to the temperature sensor of heat error compensation technology,
Thus, each temperature sensor and position sensor must be connect by individual line with acquisition controller, be caused multiple
Wiring after temperature sensor, multiple position sensors are connected with acquisition control unit is complicated.
(2) it since the temperature sensor of heat error compensation technology uses thermal resistance or thermocouple, exports as weak electric signal,
The anti-interference ability of thermal error compensating device is caused to decline, the robustness and versatility of error compensation model are not good enough.
(3) error compensation calculating is completed using single DSP or ARM chip due to heat error compensation technology to control with acquisition
System, chip power-consumption is big, response is slower, and the real-time of error compensation is bad.
(4) due to heat error compensation compensator obtains the feedback pulse signal of encoder when, the space calculated with compensator
Error pulse signal is mutually added and subtracted, and special electronic device is then used to be inserted into the thermal compensation signal as phase signal in servo loop.
It when the insertion is more complicated, is easy to appear between the feedback signal of thermal compensation signal and lathe itself and interferes, to influence
The stability of work of numerical control machine.
Summary of the invention
The present invention provides a kind of numerically-controlled machine tool heat error compensation control devices, so that heat error compensation control device cloth
Line is flexible, can effectively avoid generating vibration, noise and electromagnetic interference in process, guarantees the operation of thermal compensation device controller
Safety and stability.
To realize above-mentioned design, the invention adopts the following technical scheme:
A kind of numerically-controlled machine tool heat error compensation control device, including embedded main control unit, heat error compensation calculate list
Member, data acquisition process unit, temperature detecting unit, position detection unit and phototube coupling unit；
The data acquisition process unit acquires the number that the temperature detecting unit measures in real time by wireless transport module
The position for the numerically-controlled machine tool key position that temperature information and the position detection unit at control lathe temperature sensitivity measure in real time
Information；
The embedded main control unit obtains the temperature information of the data acquisition process unit acquisition by GPIO interface
And location information, and the data acquisition modes of the data acquisition process unit are set；
The heat error compensation computing unit receives the temperature information from the embedded main control unit by HPI interface
And location information, according to the temperature information and location information and the mathematical model computation model parameter pre-established, and will
The model parameter returns to the embedded main control unit；
The embedded main control unit calculates compensation Thermal Error according to the model parameter and the temperature information, will be described
Compensation Thermal Error inputs numerical control device by the phototube coupling unit to complete the heat error compensation of lathe.
Wherein, the mathematical model pre-established is multiple linear regression or neural network model.
It wherein, include end bearing block, lead screw shaft bearings, nut seat, main shaft before main shaft of numerical control machine tool at the temperature sensitivity
Case and lathe bed；The key position includes the X of main shaft of numerical control machine tool to, Y-direction and Z-direction.
Wherein, the data acquisition modes include acquisition channel and frequency acquisition.
Wherein, the data acquisition process unit uses fpga chip, is equipped with wireless transport module.
Wherein, the embedded main control unit uses ARM chip, is equipped with RJ45 communication interface.
Wherein, the heat error compensation computing unit uses dsp chip.
Wherein, the temperature detecting unit uses fiber grating temperature sensor, is equipped with wireless transport module.
Wherein, the position detection unit uses current vortex sensor, is equipped with wireless transport module.
The invention has the benefit that numerically-controlled machine tool of the invention heat error compensation control device, including embedded master
Control unit, heat error compensation computing unit, data acquisition process unit, temperature detecting unit, position detection unit and photoelectricity every
From unit；The data acquisition process unit acquires the numerical control that the temperature detecting unit measures in real time by wireless transport module
Believe the position for the numerically-controlled machine tool key position that temperature information and the position detection unit at lathe temperature sensitivity measure in real time
Breath；The embedded main control unit obtains temperature information and the position of the data acquisition process unit acquisition by GPIO interface
Information, and the data acquisition modes of the data acquisition process unit are set；The heat error compensation computing unit is connect by HPI
Mouthful receive the temperature information and location information from the embedded main control unit, according to the temperature information and location information with
And the mathematical model computation model parameter pre-established, and the model parameter is returned into the embedded main control unit；Institute
It states embedded main control unit and compensation Thermal Error is calculated according to the model parameter and the temperature information, by the compensation Thermal Error
Numerical control device is inputted by the phototube coupling unit to complete the heat error compensation of lathe.Numerically-controlled machine tool heat error compensation control
In device processed, temperature detecting unit and position detection unit are all made of wireless transmission method and are connected with data acquisition process unit
It connects, so that being routed simple, connection between multiple temperature detecting units and multiple position detection units and data acquisition process unit
Convenient and occupancy interface is few；Compensation Thermal Error is by inputting numerical control device again after phototube coupling unit to complete the Thermal Error of lathe
Compensation, avoids due to embedded main control unit small volume and when machine tool mechanical bulky dimensions, so that generating shake in process
Dynamic, noise and electromagnetic interference, so that the safety and stability of thermal compensation device controller operation be effectively ensured.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, institute in being described below to the embodiment of the present invention
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without creative efforts, can also implement according to the present invention
The content of example and these attached drawings obtain other attached drawings.
Fig. 1 is a kind of structure of the numerically-controlled machine tool heat error compensation control device provided in the specific embodiment of the invention
Block diagram.
Fig. 2 is a kind of insertion of the numerically-controlled machine tool heat error compensation control device provided in the specific embodiment of the invention
The structural block diagram of formula main control unit.
Fig. 3 is a kind of data of the numerically-controlled machine tool heat error compensation control device provided in the specific embodiment of the invention
The structural block diagram of acquisition process unit.
Fig. 4 is that a kind of heat of the numerically-controlled machine tool heat error compensation control device provided in the specific embodiment of the invention is missed
The structural block diagram of poor compensation calculation unit.
Fig. 5 is a kind of temperature of the numerically-controlled machine tool heat error compensation control device provided in the specific embodiment of the invention
The structural block diagram of detection unit.
Fig. 6 is a kind of position of the numerically-controlled machine tool heat error compensation control device provided in the specific embodiment of the invention
The structural block diagram of detection unit.
Fig. 7 is a kind of error of the numerically-controlled machine tool heat error compensation control device provided in the specific embodiment of the invention
The structural block diagram of compensation principle.
Specific embodiment
To keep the technical problems solved, the adopted technical scheme and the technical effect achieved by the invention clearer, below
It will the technical scheme of the embodiment of the invention will be described in further detail in conjunction with attached drawing, it is clear that described embodiment is only
It is a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those skilled in the art exist
Every other embodiment obtained under the premise of creative work is not made, shall fall within the protection scope of the present invention.
As shown in Figure 1, numerically-controlled machine tool of the invention heat error compensation control device, including embedded main control unit, heat
Error compensation computing unit, data acquisition process unit, temperature detecting unit, position detection unit and phototube coupling unit.Temperature
Degree detection unit is made of multiple temperature sensors being arranged on numerically-controlled machine tool ontology at temperature sensitivity, collects these temperature biography
The temperature information that sensor measures in real time；Position detection unit is passed by multiple displacements that key position on numerically-controlled machine tool ontology is arranged in
Sensor composition, collects the location information that these displacement sensors measure in real time；Temperature detecting unit, position detection unit are respectively provided with
There is wireless transport module, by wireless network connection between data acquisition process unit, and by temperature information, location information
Data acquisition process unit is transferred to by wireless transport module.Embedded main control unit passes through GPIO interface as host computer
Data are received from data acquisition process unit, and the data acquisition modes of data acquisition process unit are set.Heat error compensation meter
It calculates unit and temperature information and location information is received from embedded main control unit by HPI interface, according to the temperature information and position
Information and the mathematical model computation model parameter pre-established, and counted model parameter is returned into embedded master control list
Member.Embedded main control unit calculates compensation Thermal Error according to the model parameter and temperature information, and compensation Thermal Error is passed through light
It is electrically isolated unit and inputs numerical control device, the heat error compensation of numerically-controlled machine tool is then realized by the translation of control lathe coordinate system.
Wherein, the compensation Thermal Error is inputted into numerical control device by the phototube coupling unit to complete the heat of lathe accidentally
Difference compensation, specifically: by the compensation Thermal Error by entering institute by the GPIO mouth of numerical control device after the phototube coupling unit
Numerical control device is stated, according to the compensation Thermal Error by the reference origin of the PLC programming translation numerical control device, and by the benefit
Thermal Error is repaid to be added in the control signal of servo loop to realize the compensation to the margin of error of the numerical control device.
It optionally, include end bearing block, lead screw shaft bearings, nut seat, spindle box before main shaft of numerical control machine tool at temperature sensitivity
And lathe bed.Key position includes the X of main shaft of numerical control machine tool to, Y-direction and Z-direction.
Optionally, the mathematical model pre-established can be multiple linear regression or neural network model.
Optionally, data acquisition modes include acquisition channel and frequency acquisition.
Optionally, embedded main control unit uses ARM chip, is equipped with RJ45 communication interface.
As shown in Fig. 2, embedded main control unit uses ARM chip, there is the operating system based on μ CLinux, be that heat is missed
Host computer in difference compensating device.ARM chip is communicated by GPIO mouthfuls with FPGA (data acquisition process unit), is obtained from FPGA
The temperature information and location information measured in real time, and the data acquisition parameters of FPGA are set；ARM chip passes through GPIO mouthfuls and number
The CNC communication for controlling lathe, by the last GPIO mouth for calculating the compensation Thermal Error obtained and passing through phototube coupling unit and numerical control device
Input numerical control device；ARM chip is by HPI mouthfuls and the communication of DSP (heat error compensation computing unit), by temperature information and position
Information is transferred to DSP, and obtains model parameter from DSP；ARM chip realizes human-computer interaction energy by GPIO mouthfuls of connection touch screens
Power handles the return information task of man-machine interface；ARM chip passes through RJ45 communication interface and outer PC (Personal
Computer, personal computer) it is connected, to realize the remote access of data；ARM chip passes through SRAM mouthfuls of acquisition error compensations
Model brings model parameter and temperature information into the error compensation model, to calculate compensation Thermal Error；ARM chip passes through
JTAG mouthfuls are connected with detail programming module, debug to programs such as error compensation models in chip；ARM chip can also be real
Now to functions such as the predictions of real-time Thermal Error.
Embedded main control unit calculate compensate Thermal Error when, be not necessarily to acquisition position data, it is only necessary to according to pre-establishing
Mathematical model, DSP calculate model parameter and acquisition temperature data calculate compensation Thermal Error.Then by counted compensation heat
Error is converted to thermal compensation signal and is input in numerical control device by phototube coupling unit and GPIO mouthfuls of numerical control device, controls lathe
Coordinate system is translated to complete the heat error compensation of lathe.
Data acquisition process unit as shown in Figure 3, it uses fpga chip, is equipped with wireless transport module, biography that this is wireless
Defeated module is used to handle the real-time acquisition of multiple wireless high-speed data (temperature information and location information), and above-mentioned data are passed through
GPIO interface is sent to embedded main control unit (ARM chip).Meanwhile it also can be by the interface from embedded main control unit (ARM
Chip) obtain fpga chip (data acquisition process unit) data acquisition modes related parameter, such as acquisition channel, acquisition frequency
Rate etc..
Heat error compensation computing unit as shown in Figure 4, it is based on dsp chip progress heat error compensation model parameter
It calculates, the temperature and thermal error data of acquisition is obtained from the embedded main control unit based on ARM by HPI interface, according to building in advance
Vertical mathematical model calculates model parameter such as multiple linear regression, neural network model.Dsp chip (heat error compensation meter
Calculate unit) it can be according to the temperature information and location information of ARM chip transmitting, in conjunction with the mathematical model quick obtaining mould pre-established
Then the model parameter of calculating is returned to ARM chip by HPI interface by shape parameter.
The calculation amount of model parameter is very big, individually calculates the model parameter that compensation Thermal Error is used, meter using dsp chip
It calculates quickly, alleviates the calculation amount of embedded main control unit, improve the real-time effect of heat error compensation.And if by the calculating
Function is integrated on embedded main control unit, then can be too big due to the calculation amount of model parameter, leads to embedded main control unit
Chip (ARM chip) power consumption is too big, response is too slow, the final real-time for influencing compensation Thermal Error, so that the effect of heat error compensation
Fruit is poor.
Temperature detecting unit as shown in Figure 5 includes fiber grating temperature sensor, fiber Bragg grating (FBG) demodulator, is equipped with RJ45
The wireless communication module and power module of interface.Fiber grating temperature sensor is installed on numerically-controlled machine tool, the heat of numerically-controlled machine tool
Deformation can make grating fibers generate deformation, obtain between detecting slight change produced by internal optical wavelength by fiber Bragg grating (FBG) demodulator
Obtain numerically-controlled machine tool temperature information.Since fiber grating is transmitted using optical signalling, not by industrial environment electromagnetic interference
Influence, have very high stability.Fiber Bragg grating (FBG) demodulator transmits temperature data using Ethernet outward, using wireless communication
Wired Ethernet is converted to wireless communication by module, and temperature data is transferred to data acquisition process unit, greatly letter
Wiring is changed.Sensor arrangement at numerically-controlled machine tool temperature sensitivity, acquisition front-end of spindle bearing block, lead screw shaft bearings, nut seat,
Temperature information near spindle box, lathe bed and lathe etc..
Position detection unit as shown in FIG. 6 includes current vortex sensor, input conditioning circuit, equipped with A/D interface
PLC single-chip microcontroller, detail programming module, wireless communication module and power module, current vortex sensor are mounted on each kinematic axis, such as
Numerically-controlled machine tool X detects the accurate variation of kinematic axis at, Y-direction and Z-direction.The analog signal of current vortex sensor is improved through input
Digital signal is converted into using the PLC single-chip microcontroller for being equipped with A/D interface after circuit filtering and amplification.Module by wireless communication
The digital data transmission gives data acquisition process unit.
Working principle: referring to FIG. 7, embedded main control unit (ARM chip) host computer carries out data by GPIO port
The function definition of each port of detection unit and temperature and position data acquisition period.Data acquisition process unit passes through wireless
Transmission module sends the data acquisition command for having timestamp with the forms of broadcasting to temperature detecting unit, position detection unit；Temperature
After spending detection unit, position detection unit by data acquisition command, temperature sensor and position sensor detection are read respectively
Data, random delay sends what temperature sensor and position sensor detected to data acquisition process unit for a period of time respectively
Data and time stamp data.In work pieces process real-time compensation, heat error compensation computing unit passes through HPI interface from embedded master
It controls unit and receives temperature information and location information, and according to the temperature information and location information and the mathematical model pre-established
Computation model parameter, and counted model parameter is returned into embedded main control unit.Embedded main control unit ARM will compensate heat
Error is converted to error compensating signal, and by phototube coupling unit, the error compensating signal is sent to the GPIO interface of digital control system,
Then it is designed by PLC program and the value for compensating Thermal Error is read in into the address R of PLC and specified error information storage unit is written
In (address G), numerical control device deviates external lathe coordinate system further according to the error information control in the address G, and will compensate heat accidentally
In the control signal for the servo loop that the value of difference is added to servo-system, to realize the heat error compensation to numerically-controlled machine tool.
The present invention realizes the data exchange of thermal compensation device and numerical control device by the way of Phototube Coupling, be avoided that due to
Embedded main control unit small volume, and machine tool mechanical bulky dimensions, so that being also easy to produce vibration, noise and electromagnetism in process
The situation of interference, so that the safety and stability of heat error compensation control device operation be effectively ensured.
In conclusion numerically-controlled machine tool of the invention realizes heat with heat error compensation control device by the way of Phototube Coupling
The data exchange of compensation device and numerical control device is avoided that due to embedded main control unit small volume, and machine tool mechanical size
It is huge, so that the situation of vibration, noise and electromagnetic interference is also easy to produce in process, so that heat error compensation control be effectively ensured
The safety and stability of device operation.Using wireless transmission method by multiple temperature detecting units and multiple position detection units
It is connect with data acquisition process unit, has many advantages, such as that wiring is simple, easy to connect, it is few to occupy interface.Using fiber grating temperature
Sensor is spent, the anti-interference of system is substantially increased, is suitable for the scene temperature measurement of adverse circumstances.Using FPGA, ARM and
Tri- kinds of chips of DSP are respectively completed data acquisition process, embedded interaction control is calculated with error compensation model parameter, have response
The advantage that speed is fast, control function is powerful, man-machine interface is friendly.Error compensation is programmed by PLC and is realized, without special electronics
Phase signal is added in servo loop by device, will not interfere and shadow because of the feedback signal of thermal compensation signal and lathe itself
Ring the stability of work.
The technical principle of the invention is described above in combination with a specific embodiment.These descriptions are intended merely to explain of the invention
Principle, and shall not be construed in any way as a limitation of the scope of protection of the invention.Based on the explanation herein, the technology of this field
Personnel can associate with other specific embodiments of the invention without creative labor, these modes are fallen within
Within protection scope of the present invention.
Claims (9)
1. a kind of numerically-controlled machine tool heat error compensation control device, which is characterized in that mended including embedded main control unit, Thermal Error
Repay computing unit, data acquisition process unit, temperature detecting unit, position detection unit and phototube coupling unit；
The data acquisition process unit acquires the numerical control machine that the temperature detecting unit measures in real time by wireless transport module
The location information for the numerically-controlled machine tool key position that temperature information and the position detection unit at bed tempertaure sensitivity measure in real time；
The embedded main control unit obtains temperature information and the position of the data acquisition process unit acquisition by GPIO interface
Confidence breath, and the data acquisition modes of the data acquisition process unit are set；
The heat error compensation computing unit receives the temperature information and position from the embedded main control unit by HPI interface
Confidence breath, according to the temperature information and location information and the mathematical model computation model parameter pre-established, and will be described
Model parameter returns to the embedded main control unit；
The embedded main control unit calculates compensation Thermal Error according to the model parameter and the temperature information, by the compensation
Thermal Error inputs numerical control device by the phototube coupling unit to complete the heat error compensation of lathe.
2. a kind of numerically-controlled machine tool heat error compensation control device according to claim 1, which is characterized in that described preparatory
The mathematical model of foundation is multiple linear regression or neural network model.
3. a kind of numerically-controlled machine tool heat error compensation control device according to claim 1, which is characterized in that the temperature
Including end bearing block, lead screw shaft bearings, nut seat, spindle box and lathe bed before main shaft of numerical control machine tool at sensitivity；The key position
X including main shaft of numerical control machine tool is to, Y-direction and Z-direction.
4. a kind of numerically-controlled machine tool heat error compensation control device according to claim 1, which is characterized in that the data
Acquisition mode includes acquisition channel and frequency acquisition.
5. a kind of numerically-controlled machine tool heat error compensation control device according to claim 1-4, which is characterized in that
The data acquisition process unit uses fpga chip, is equipped with wireless transport module.
6. a kind of numerically-controlled machine tool heat error compensation control device according to claim 1-4, which is characterized in that
The embedded main control unit uses ARM chip, is equipped with RJ45 communication interface.
7. a kind of numerically-controlled machine tool heat error compensation control device according to claim 1-4, which is characterized in that
The heat error compensation computing unit uses dsp chip.
8. a kind of numerically-controlled machine tool heat error compensation control device according to claim 1-4, which is characterized in that
The temperature detecting unit uses fiber grating temperature sensor, is equipped with wireless transport module.
9. a kind of numerically-controlled machine tool heat error compensation control device according to claim 1-4, which is characterized in that
The position detection unit uses current vortex sensor, is equipped with wireless transport module.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108241338A (en) * | 2018-01-24 | 2018-07-03 | 广东机电职业技术学院 | A kind of numerically-controlled machine tool heat error compensation control device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108241338A (en) * | 2018-01-24 | 2018-07-03 | 广东机电职业技术学院 | A kind of numerically-controlled machine tool heat error compensation control device |
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