CN204926089U - Prediction control system of accurate fluid pressure guide rail - Google Patents
Prediction control system of accurate fluid pressure guide rail Download PDFInfo
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- CN204926089U CN204926089U CN201520641590.6U CN201520641590U CN204926089U CN 204926089 U CN204926089 U CN 204926089U CN 201520641590 U CN201520641590 U CN 201520641590U CN 204926089 U CN204926089 U CN 204926089U
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- slide carriage
- oil pocket
- hydrostatic slideway
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Abstract
The utility model discloses a prediction control system of accurate fluid pressure guide rail, this system includes: fluid pressure guide rail, a plurality of oil pocket, a plurality of electro -hydraulic proportional air -vent valve, displacement sensor, pressure transmitter, CAM CAM control system and prediction controlling means, the fluid pressure guide rail with the oil pocket is connected, the electro -hydraulic proportional air -vent valve displacement sensor pressure transmitter and CAM control system all with the prediction controlling means connect. Through adopting prediction controlling means to calculate the size and the situation of change of processing load in advance, the problem of response lag has been eliminated completely to preset oil pocket pressure, and the carriage apron that can effectively reduce under the developments processing loading is undulant for guide rail transmission precision is higher.
Description
Technical field
The utility model relates to lathe mechanical-electrical-hydraulic integration field, is specifically related to a kind of foresee controlling system of liquid precision hydrostatic slideway.
Background technology
Precision processing technology is the important support of manufacturing power, and ultra-precision machine tool, as precision machined support, is the focus of national medium-term and long-term scientific research planning research always.Hydrostatic slideway relies on high rigidity, low wearing and tearing, run the advantage such as accurate becomes rapidly the infrastructure component that Ultra-precision CNC Machine shares.But because in process, chip-load constantly changes, destroy hydrostatic slideway slide carriage stress balance, cause the relative position between slide carriage and guide rail slideway to fluctuate indefinite, change the workpiece of clamping on slide carriage and the ideal position relation between cutter, reduce machine finish.
Along with modern large-scale integrated manufacturing technology, nanometer technology, superelevation times astronomical sight technology, military most advanced and sophisticated radar, ultraprecise three-dimensional (3Dimensions, be called for short 3D) development such as printing technique, higher requirement is proposed to the accuracy of guide rail technology, reliability, high efficiency.Domestic and international experts and scholars have many achievements in research, for the technical progress of ultraprecise hydrostatic slideway plays an important role from aspects such as hydrostatic guide rail system Static and dynamic performance, guide rail structure or Flow Field Distribution, thermosetting couplings.However, at present how the slide carriage fluctuation problem because dynamic machining load brings is avoided to ultraprecise hydrostatic slideway, also do not find effective solution always, because processing load complicated and changeable being difficult to is controlled on the one hand, also be the control hysteresis being limited by the intrinsic damping characteristic of guide rail hydraulic system and bringing on the other hand, cause and regulate passive or respond the problems such as slow.
Utility model content
For processing in prior art, load is complicated and changeable to be difficult to control and the intrinsic damping characteristic of guide rail hydraulic system and the defect of control hysteresis brought, and the utility model provides a kind of foresee controlling system of liquid precision hydrostatic slideway.
The utility model proposes a kind of foresee controlling system of liquid precision hydrostatic slideway, comprise: hydrostatic slideway, several electric-hydraulic proportion pressure regulator valves, displacement transducer, pressure unit, computer-aided manufacturing (ComputerAidedManufacturing is called for short CAM) control system and foresee controlling device;
Wherein, described hydrostatic slideway comprises several oil pockets, described electric-hydraulic proportion pressure regulator valve, institute's displacement sensors, described pressure unit and described CAM control system are all connected with described foresee controlling device, described electric-hydraulic proportion pressure regulator valve is connected with described oil pocket by fluid pressure line, institute's displacement sensors is positioned at described slide carriage side, for measuring the undulate quantity of described slide carriage vertical direction, described pressure unit connects described fluid pressure line and between described electric-hydraulic proportion pressure regulator valve and described oil pocket.
Preferably, described hydrostatic slideway comprises base, described slide carriage, work stage, track, described fluid pressure line, valve block, pipe joint and oil film;
Described base is connected with described track;
Described slide carriage is sheathed on described track, and slides along described track;
Described work stage is connected with described slide carriage;
Described valve block is connected described oil pocket by described fluid pressure line with described pipe joint;
Described oil film is positioned on the surface of contact of described track and described slide carriage.
Preferably, described oil pocket is symmetrically distributed on upper and lower two surface of contact of described slide carriage and described track.
Preferably, each described oil pocket configures a described electric-hydraulic proportion pressure regulator valve.
Preferably, each described oil pocket configures a described pressure unit.
Preferably, testing result for detecting the oil pressure in described oil pocket, and is fed back to described foresee controlling device by described pressure unit.
Preferably, institute's displacement sensors for measuring the undulate quantity of described slide carriage vertical direction, and feeds back to described foresee controlling device.
As shown from the above technical solution, size and the situation of change of the utility model by adopting foresee controlling device to calculate processing load in advance, adjust oil pocket pressure in advance, completely eliminate the problem of response lag, and the slide carriage fluctuation that can effectively reduce under the effect of dynamic machining load, make guide rail transmission accuracy higher.Rationally can tackle the processing load change of cataclysm simultaneously, the effect that very high oil pressure just can play the fluctuation of opposing slide carriage need not be exported, control energy consumption lower, generate heat less.And by calculating the processing load change in working angles in advance, be convenient to realize process intelligentized control method.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these figure.
The structural representation of the foresee controlling system of a kind of liquid precision hydrostatic slideway that Fig. 1 provides for the utility model one embodiment;
The tomograph of a kind of liquid precision hydrostatic slideway that Fig. 2 provides for the utility model one embodiment.
Embodiment
Below in conjunction with accompanying drawing, the embodiment of utility model is further described.Following examples only for clearly the technical solution of the utility model being described, and can not limit protection domain of the present utility model with this.
Fig. 1 shows the structural representation of the foresee controlling system of a kind of liquid precision hydrostatic slideway that the utility model one embodiment provides, and comprising: hydrostatic slideway, several electric-hydraulic proportion pressure regulator valves 2, displacement transducer 3, pressure unit 4, CAM control system 5 and foresee controlling device 6; Wherein, described hydrostatic slideway comprises several oil pockets 1, described electric-hydraulic proportion pressure regulator valve 2, institute's displacement sensors 3, described pressure unit 4 and described CAM control system 5 are all connected with described foresee controlling device 6, described electric-hydraulic proportion pressure regulator valve 2 is connected with described oil pocket 1 by fluid pressure line, institute's displacement sensors 3 is positioned at described slide carriage 8 side, for measuring the undulate quantity of described slide carriage 8 vertical direction, described pressure unit 4 connects described fluid pressure line and between described electric-hydraulic proportion pressure regulator valve 2 and described oil pocket 1.
In configuration aspects, each oil pocket 1 of hydrostatic slideway is distributed in below worktable slide carriage 8 symmetrically, as shown in Figure 2.The in-line of each oil pocket 1 is equipped with electro-hydraulic proportional flow valve 2.The application point processing load in process constantly changes, and the separate loading that each oil pocket 1 bears also can change thereupon.Therefore the pressure of often pair of oil pocket 1 is applied to it in foresee controlling mode, the pressure being changed oil pocket 1 by electro-hydraulic proportional flow valve 2 maintains slide carriage 8 bearing up-down force balance, reduces slide carriage 8 and fluctuates, improve guide rail transmission accuracy.
The foresee controlling system that the present embodiment provides with slide carriage undulate quantity for echo signal R (k), with slide carriage side-play amount y (k) for controlled variable.System is by CNC milling machine computer-aided design (CAD) (ComputerAidedDesign, be called for short CAD)/CAM control system, the processing load Fz calculating gained is inputted in foresee controlling device as Future Information, corresponding sharing part of the load preview information is inputted to different oil pocket, so that regulable control signal u (k) in advance, thus ACTIVE CONTROL oil pocket pressure.Add the feedforward compensation link utilizing Future Information guide rail load d (k), can phase delay in reduction system as much as possible between desired value R (k) and controlled variable oil film undulate quantity y (k), make oil pocket pressure energy follow guide rail load change without delay.
Particularly, CAM system has first planned machining locus in advance according to processing request, and simulate the processing load situation of change of process middle guide slide carriage 8, future signal as foresee controlling is input in foresee controlling device 6 by this output quantity, take echo signal as index, calculate the electric signal acting on electric-hydraulic proportion pressure regulator valve 2, electric-hydraulic proportion pressure regulator valve 2 automatically can adjust the hydraulic oil liquid flow and pressure that export under the control of input electrical signal, thus the oil liquid pressure of adjustment guide rail oil pocket 1, ensure the steady state (SS) of the slide carriage 8 when processing load change.Meanwhile, have and to detect and feedback assembly detects the undulate quantity of slide carriage 8 in real time and feedback understands foresee controlling device 6, constantly to revise the control electric signal of electric-hydraulic proportion pressure regulator valve 2.
By the size and the situation of change that adopt foresee controlling device to calculate processing load in advance, adjust oil pocket pressure in advance, completely eliminate the problem of response lag, and the slide carriage fluctuation under the effect of dynamic machining load can be effectively reduced, make guide rail transmission accuracy higher.Rationally can tackle the processing load change of cataclysm simultaneously, the effect that very high oil pressure just can play the fluctuation of opposing slide carriage need not be exported, control energy consumption lower, generate heat less.And by calculating the processing load change in working angles in advance, be convenient to realize process intelligentized control method.
Fig. 2 shows the tomograph of the foresee controlling system of a kind of liquid precision hydrostatic slideway that the utility model one embodiment provides.Mainly comprise: base 9, guide rail slide carriage 8, work stage 10, track 11, fluid pressure line 12, valve block 14, pipe joint 13, and unillustrated oil pocket 1, oil film 9, electro-hydraulic proportional flow valve 2, CAM module 5, foresee controlling device 6, pressure unit 4, displacement transducer 3, safety valve, pump group and fuel tank; Described base 9 is connected with described track 11; Described slide carriage 8 is sheathed on described track 11, and slides along described track 11; Described work stage 10 is connected with described slide carriage 8; Described valve block 14 is connected described oil pocket 1 by described fluid pressure line 12 with described pipe joint 13; Described oil film 9 is positioned on the surface of contact of described track 11 and described slide carriage 8.
When adopting foresee controlling mode, do not need to set up other mechanisms in hydrostatic guide rail system, and only the throttling valve of original oil pocket in-line need be changed into electro-hydraulic proportional flow valve 2, then implement to control to electro-hydraulic proportional flow valve 2.Hydrostatic slideway in the course of the work, float downward in the support of track and oil pocket 1 and arise from oil film 9, driven the operation of slide carriage 8 direction along ng a path by linear electric motors by slide carriage 8.Because the work stage 10 above slide carriage 8 is constantly subject to the effect of dynamic machining load, produce the acceleration of vertical direction, cause the fluctuation up and down of slide carriage 8, this just needs electro-hydraulic proportional flow valve 2 to intervene the oil liquid pressure of oil pocket 1 in advance, resists slide carriage fluctuation by the adjustment power be applied on slide carriage 8.Be process load information the future by introducing CAM module 5 and calculate the pressure that oil pocket 1 needs to provide in advance with general control mode unlike, foresee controlling device 6, can realize when processing load and arriving resisting slide carriage 8 fluctuate without delayed.The oil pocket pressure changing information that detection feedback module collection pressure unit 4 records and the slide carriage vertical direction undulate quantity that displacement transducer 3 records, and feed back to foresee controlling device 6, constantly to make correction.
Foresee controlling device 6 comprises the sub-device of multiple foresee controlling, each electro-hydraulic proportional flow valve 2 is controlled by a sub-device of foresee controlling, the sub-device of foresee controlling accepts precalculated each oil pocket 1 by the separate loading that bears and variation tendency information thereof, and require that exporting the flow of control signal to electro-hydraulic proportional flow valve 2 controls according to these information and control objectives, and the flow equilibrium that oil pocket 1 is leaked by controlled input flow rate and oil clearance, change the oil pressure in oil pocket 1, the anchorage force change that oil pocket pressure is produced slide carriage 8 offsets the processing load predicted to the change of slide carriage acting force, the fluctuation of oil film thickness with load change can be reduced like this, improve machine tool guideway transmission accuracy.
As the preferred version of the present embodiment, on the basis of above-described embodiment, described oil pocket is symmetrically distributed on upper and lower two surface of contact of described slide carriage and described track; Each described oil pocket configures a described electric-hydraulic proportion pressure regulator valve; Each described oil pocket configures a described pressure unit; Testing result for detecting the oil pressure in described oil pocket, and is fed back to described foresee controlling device by described pressure unit; Institute's displacement sensors for measuring the undulate quantity of described slide carriage vertical direction, and feeds back to described foresee controlling device.
Know below and in detail the basic functional principle of the foresee controlling system of liquid precision hydrostatic slideway of the present utility model be described, specifically comprise the following steps:
S1: by the processing load information of CAM Control system simulation slide carriage, obtains the cutting force of each oil pocket according to described processing load information.
Under accurate digital control process technology background, according to the parameter and digital control (NumericalControl at the whole story of work piece, being called for short NC) program plans that the CAM control system in cutter track rail footpath is come out in advance, relation between tool feeding path and instantaneous cutting force is bright and clear, can predict the processing load change of guide track system.Thus can by the processing load information of CAM Control system simulation slide carriage, and the cutting force of each oil pocket is obtained according to described processing load information, carrying out pro-active intervention hydrostatic slideway oil pocket pressure by constantly following processing load change, fluctuating with real-Time Compensation oil film thickness.
S2: according to the cutting force of described each oil pocket, and the slide carriage undulate quantity preset, export control signal.
Theoretical according to foresee controlling, and with guide rail slide carriage undulate quantity be desired value, to process load for Future Information, research and analyse slide carriage vertical direction displacement fluctuation situation, object to eliminate in process dynamic machining load to the impact of hydrostatic slideway transmission accuracy.Future Information is utilized to improve the machining precision of system, realize the foresee controlling to oil film thickness, regulate flow and the pressure of oil pocket according to load information on the horizon in advance, eliminate the phenomenon of the passive deflection of guide rail slide carriage brought due to load in real time, improve machine finish further.
S3: according to described control signal, controls fluid flow by electric-hydraulic proportion pressure regulator valve, and then controls the oil pressure of described oil pocket, to offset the processing load of prediction to the acting force of described slide carriage, compensates the fluctuation of oil film thickness.
By the size and the situation of change that adopt foresee controlling device to calculate processing load in advance, adjust oil pocket pressure in advance, completely eliminate the problem of response lag, and the slide carriage fluctuation under the effect of dynamic machining load can be effectively reduced, make guide rail transmission accuracy higher.Rationally can tackle the processing load change of cataclysm simultaneously, the effect that very high oil pressure just can play the fluctuation of opposing slide carriage need not be exported, control energy consumption lower, generate heat less.And by calculating the processing load change in working angles in advance, be convenient to realize process intelligentized control method.
Further, available forecast control method optimization comprises that slide carriage swings, slide carriage run the lathes such as driving force other with processing load change affected index.And the electric-hydraulic proportion pressure regulator valve selected by the present embodiment also can replace with other pressure regulator valves.
Particularly, the step S1 in above-described embodiment comprises further:
S11: utilize instantaneous rigidity cutting mechanics model, calculates the cutting force of slide carriage, cutting force change and cutting force application point;
S12: according to the cutting force of described slide carriage, cutting force change and cutting force application point, utilize space mechanics principle, calculates cutting force and the cutting force change of each oil pocket.
In steering logic, first with existing instantaneous rigidity cutting mechanics model, calculate the slide carriage all directions processing size of load, direction situation of change and application point in advance, more based on this, calculate according to space mechanics principle the separate loading that each oil pocket bears.Under the separate loading born at oil pocket and all clear and definite prerequisite of variation tendency thereof, just can require that exporting the flow of control signal to electro-hydraulic proportional flow valve controls according to these information and control objectives, and the flow equilibrium that oil pocket is leaked by controlled input flow rate and oil clearance, change the oil pressure in oil pocket, make processing load that oil pocket pressure is predicted the anchorage force change counteracting that slide carriage produces to the change of slide carriage acting force.
Further, above embodiment is further comprising the steps of:
S4: by the change of slide carriage undulate quantity described in displacement sensor, upgrades current slide carriage undulate quantity according to the change of described slide carriage undulate quantity, and performs step S2;
S5: by the change of the oil pressure of oil pocket described in pressure transmitter measurement, and according to the change of described oil pressure, export new described control signal, and perform step S3.
Further, in detail the basic functional principle of the foresee controlling system of liquid precision hydrostatic slideway of the present utility model is further described in order to clear, introduces the structure of foresee controlling device below in detail, comprising:
Cutting force computing module, control signal output module and hydraulic control module; Wherein, cutting force computing module is used for the processing load information by CAM Control system simulation slide carriage, obtains the cutting force of each oil pocket according to described processing load information; Control signal output module is used for the cutting force according to described each oil pocket, and the slide carriage undulate quantity preset, and exports control signal; Hydraulic control module is used for according to described control signal, controls fluid flow, and then control the oil pressure of described oil pocket by electric-hydraulic proportion pressure regulator valve, to offset the processing load of prediction to the acting force of described slide carriage, compensates the fluctuation of oil film thickness.
Future signal as foresee controlling is input in foresee controlling device by the processing load situation of change of slide carriage, be that the dreamboat signal of zero is for index to fluctuate, calculate the electric signal acting on electric-hydraulic proportion pressure regulator valve, electric-hydraulic proportion pressure regulator valve automatically can adjust the hydraulic oil liquid flow and pressure that export under the control of input electrical signal, thus the oil liquid pressure of adjustment guide rail oil pocket.
Particularly, cutting force computing module comprises slide carriage cutting force computing unit and oil pocket cutting force computing unit further; Wherein, slide carriage cutting force computing unit is used for utilizing instantaneous rigidity cutting mechanics model, calculates the cutting force of slide carriage, cutting force change and cutting force application point; Oil pocket cutting force computing unit, for the cutting force according to described slide carriage, cutting force change and cutting force application point, utilizes space mechanics principle, calculates cutting force and the cutting force change of each oil pocket.
Also comprise with lower module: slide carriage undulate quantity detects feedback module and oil pressure detects feedback module; Wherein, slide carriage undulate quantity detects feedback module for the change by slide carriage undulate quantity described in displacement sensor, upgrades current slide carriage undulate quantity according to the change of described slide carriage undulate quantity; Oil pressure detects feedback module and is used for by the change of the oil pressure of oil pocket described in pressure transmitter measurement, and according to the change of described oil pressure, exports new described control signal.
Slide carriage undulate quantity detects feedback module and oil pressure detection feedback module can be referred to as detection feedback module, the oil pocket pressure changing information that detection feedback module primary responsibility collection pressure unit records and the slide carriage vertical direction undulate quantity that displacement transducer records, and feed back to foresee controlling device.
In instructions of the present utility model, describe a large amount of detail.But can understand, embodiment of the present utility model can be put into practice when not having these details.In some instances, be not shown specifically known method, structure and technology, so that not fuzzy understanding of this description.
Claims (7)
1. a foresee controlling system for liquid precision hydrostatic slideway, is characterized in that, comprising: hydrostatic slideway, several electric-hydraulic proportion pressure regulator valves, displacement transducer, pressure unit, computer auxiliaring manufacturing CAM control system and foresee controlling device;
Wherein, described hydrostatic slideway comprises several oil pockets, described electric-hydraulic proportion pressure regulator valve, institute's displacement sensors, described pressure unit and described CAM control system are all connected with described foresee controlling device, described electric-hydraulic proportion pressure regulator valve is connected with described oil pocket by fluid pressure line, institute's displacement sensors is positioned at slide carriage side, for measuring the undulate quantity of described slide carriage vertical direction, described pressure unit connects described fluid pressure line and between described electric-hydraulic proportion pressure regulator valve and described oil pocket.
2. the foresee controlling system of a kind of liquid precision hydrostatic slideway according to claim 1, is characterized in that, described hydrostatic slideway comprises base, described slide carriage, work stage, track, described fluid pressure line, valve block, pipe joint and oil film;
Described base is connected with described track;
Described slide carriage is sheathed on described track, and slides along described track;
Described work stage is connected with described slide carriage;
Described valve block is connected described oil pocket by described fluid pressure line with described pipe joint;
Described oil film is positioned on the surface of contact of described track and described slide carriage.
3. the foresee controlling system of a kind of liquid precision hydrostatic slideway according to claim 2, is characterized in that, described oil pocket is symmetrically distributed on upper and lower two surface of contact of described slide carriage and described track.
4. the foresee controlling system of a kind of liquid precision hydrostatic slideway according to claim 1, is characterized in that, each described oil pocket configures a described electric-hydraulic proportion pressure regulator valve.
5. the foresee controlling system of a kind of liquid precision hydrostatic slideway according to claim 1, is characterized in that, each described oil pocket configures a described pressure unit.
6. the foresee controlling system of a kind of liquid precision hydrostatic slideway according to claim 1, is characterized in that, testing result for detecting the oil pressure in described oil pocket, and is fed back to described foresee controlling device by described pressure unit.
7. the foresee controlling system of a kind of liquid precision hydrostatic slideway according to claim 1, is characterized in that, institute's displacement sensors for measuring the undulate quantity of described slide carriage vertical direction, and feeds back to described foresee controlling device.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520641590.6U CN204926089U (en) | 2015-08-24 | 2015-08-24 | Prediction control system of accurate fluid pressure guide rail |
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| CN201520641590.6U CN204926089U (en) | 2015-08-24 | 2015-08-24 | Prediction control system of accurate fluid pressure guide rail |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105773299A (en) * | 2016-04-21 | 2016-07-20 | 广东工业大学 | Oil seal device convenient to measure oil pressure of oil cavities of vertical ultraprecise static-pressure guide rail |
| CN110142647A (en) * | 2019-05-20 | 2019-08-20 | 华中科技大学 | A kind of hydrostatic slideway steady-state performance real-time measurement apparatus and method |
| CN112154089A (en) * | 2018-05-15 | 2020-12-29 | 西门子交通有限公司 | Device for positioning a transformer in a rail vehicle |
| WO2021082451A1 (en) * | 2019-11-02 | 2021-05-06 | 温岭市大众精密机械有限公司 | Dual-spindle machine tool |
| TWI813477B (en) * | 2022-10-19 | 2023-08-21 | 東佑達奈米系統股份有限公司 | Air floatation rail device |
-
2015
- 2015-08-24 CN CN201520641590.6U patent/CN204926089U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105773299A (en) * | 2016-04-21 | 2016-07-20 | 广东工业大学 | Oil seal device convenient to measure oil pressure of oil cavities of vertical ultraprecise static-pressure guide rail |
| CN105773299B (en) * | 2016-04-21 | 2018-03-09 | 广东工业大学 | A kind of close hydrostatic slideway oil pocket oil pressure of vertical superfinishing just surveys oil-sealing arrangement |
| CN112154089A (en) * | 2018-05-15 | 2020-12-29 | 西门子交通有限公司 | Device for positioning a transformer in a rail vehicle |
| CN112154089B (en) * | 2018-05-15 | 2023-09-22 | 西门子交通有限公司 | Device for positioning a transformer in a rail vehicle |
| US11981358B2 (en) | 2018-05-15 | 2024-05-14 | Siemens Mobility GmbH | Arrangement for positioning a transformer in a rail vehicle |
| CN110142647A (en) * | 2019-05-20 | 2019-08-20 | 华中科技大学 | A kind of hydrostatic slideway steady-state performance real-time measurement apparatus and method |
| CN110142647B (en) * | 2019-05-20 | 2023-09-29 | 华中科技大学 | Device and method for measuring steady-state performance of hydrostatic guideway in real time |
| WO2021082451A1 (en) * | 2019-11-02 | 2021-05-06 | 温岭市大众精密机械有限公司 | Dual-spindle machine tool |
| TWI813477B (en) * | 2022-10-19 | 2023-08-21 | 東佑達奈米系統股份有限公司 | Air floatation rail device |
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