CN104481950A - Servo valve sleeve and machining method thereof - Google Patents
Servo valve sleeve and machining method thereof Download PDFInfo
- Publication number
- CN104481950A CN104481950A CN201410715773.8A CN201410715773A CN104481950A CN 104481950 A CN104481950 A CN 104481950A CN 201410715773 A CN201410715773 A CN 201410715773A CN 104481950 A CN104481950 A CN 104481950A
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- CN
- China
- Prior art keywords
- valve pocket
- servo
- oil duct
- servo valve
- servocontrol
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
- B23P15/001—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass valves or valve housings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K27/00—Construction of housing; Use of materials therefor
Abstract
A servo valve sleeve comprises a servo valve sleeve base. A servo feedback hole is formed in one end of the servo valve sleeve base, a valve sleeve matching inner hole is formed in the other end of the servo valve sleeve base, a mounting technology notch is formed in one side of the servo feedback hole, a pressure balancing oil channel is formed in one side of the valve sleeve matching inner hole, a left oil passage, a right oil passage, an upper servo control oil channel and a lower servo control oil channel are symmetrically formed about a rotation center of the servo valve sleeve base, so that the oil return load of a servo system can be reduced, oil channels of a valve spool are staggered, oil flow is closed, so that a servo valve cannot be controlled by the servo system and stops running at fixed time, servo valve sleeve base parts are assembled according to established assembly gaps and sizes, noise is reduced, and transmission performances of the parts can be ensured.
Description
Technical field
The present invention relates to servo-control system technical field, particularly relate to a kind of servo valve pocket and processing method thereof.
Background technique
Servovalve is as the core conversion element of servo-control system, its performance directly affects the precision and stability of whole control system, and the feedback control valve pocket of servovalve is installed in servo valve body, and be set on servo spool, when servo feedback is to valve pocket, valve pocket under the effect of feedback rod around Spool rotating.But the valve pocket control port used at present and spool oil duct are positioned at same position, when closing valve pocket control port, the oil duct of spool also will be closed, be equal to servo-system performs components and parts manipulation to servo, when needs fixed point run-stopping status, can not fix a point in time to stop, easily causing servo-system output quantity inaccurate; The unidirectional turnover of pressure oil, causes the oil return load of servo-system large simultaneously; In addition, oil-feed and the fixed point at servo variable displacement cylinder two ends are wayward, in valve pocket assembly process, fit up gap between each assembly and size are also equal important, fit up gap is excessive, the noise produced during operation is large, not only causes environmental pollution, and affects the transmission performance between each assembly; Equipment gap is too small, directly causes valve pocket internal component to damage, easily breaks down.
Summary of the invention
Technical problem solved by the invention is to provide a kind of servo valve pocket and processing method thereof, to solve the shortcoming in above-mentioned background technology.
Technical problem solved by the invention realizes by the following technical solutions:
Servo valve pocket, comprise servo valve pocket matrix, wherein, servo valve pocket matrix one end is provided with the servo feedback hole of inserting for system feedback bar bulb, whole servovalve is enclosed within around Spool rotating under the effect of feedback rod, and the other end is provided with for coordinating the valve pocket installed to coordinate endoporus with servo spool; Side, servo feedback hole has mounting process breach, spool is acted on through valve pocket for external reset valve seat, impel valve core reset, valve pocket cooperation endoporus side is provided with the balance pressure oil duct for connecting chamber portion, valve pocket upper-end surface and servo valve pocket miscellaneous part, to balance the pressure of each parts of servo valve pocket, valve pocket is made to be in relative balance state in valve body; And being symmetrically arranged with left oil canal and right oil canal at the gyration center about servo valve pocket matrix, right oil canal is used for entering of servocontrol pressure oil, and left oil canal is used for the off-load oil return of servo-system; In addition, the gyration center symmetry about servo valve pocket matrix be also provided with lower servocontrol oil duct and on servocontrol oil duct, and upper servocontrol oil duct aperture is less than lower servocontrol oil duct aperture, lower servocontrol oil duct and upper servocontrol oil duct are respectively used to oil-feed to servo variable displacement cylinder two ends and position control.
In the present invention, servo valve pocket matrix upper end is provided with valve pocket cooperation cylindrical, for coordinating with the installation of servo valve body.
In the present invention, servo valve pocket matrix is provided with upper valve sleeve step cylindrical and lower valve sleeve step cylindrical, coordinates contact for reducing, effectively reducing the resistance feeding back and stir, and valve pocket coordinates cylindrical to be separated by lower valve sleeve step cylindrical, plays the effect of two end supports.
In the present invention, periphery, servo feedback hole is provided with valve pocket inner bore of step, coordinating contact, effectively reducing the resistance feeding back and stir for reducing.
In the present invention, servo valve pocket matrix side is provided with valve pocket and supports end face, and after loading valve body, valve pocket support end face contacts with valve body bottom surface and holds up whole servo valve pocket matrix.
In the present invention, valve pocket supports end face both sides and is respectively arranged with bottom support chamfering, and bottom support chamfering is convenient to overall loading valve body, and larger chamfering arranges the surface of contact that effective minimizing valve pocket supports end face and valve body, to reduce resistance, prevent servo valve pocket matrix from damaging in assembly process.
In the present invention, bottom support chamfer angle is 30 ° ~ 60 °.
In the present invention, left oil canal, right oil canal, lower servocontrol oil duct and upper servocontrol oil duct coordinate endoporus circumferentially around valve pocket, with the oil duct of the spool that staggers, close logical oil, and then block servo-system to the manipulation of servovalve, achieve fixed point out of service.
Servo valve pocket processing method, concrete steps are as follows:
1) body material is chosen, modified polishing bar selected by body material, double dynamical main shaft automatic lathe is adopted to process, and lower servocontrol oil duct and upper servocontrol oil duct adopt and same reamer run through processing simultaneously, ensure the coaxality of time servocontrol oil duct and upper servocontrol oil duct, obtain valve pocket base substrate, and Production development sampling observation detector is installed in double dynamical main shaft automatic lathe, detect critical size, to ensure the machining accuracy produced in batches, effectively control scrappage;
2) to step 1) in obtain valve pocket billet surface carry out gas nitriding process, grinding front surface hardness is not less than 850HV0.2, depth of penetration 0.35 ~ 0.5mm;
3) to step 2) in carry out the valve pocket base substrate that gas nitriding is disposed and carry out fine finishing, honing valve pocket coordinates endoporus, and after honing, hardness is not less than 700HV0.2, and depth of penetration is not less than 0.2mm;
4) with step 3) in the valve pocket of honing coordinate endoporus to be positioning datum, adopt plug to insert valve pocket and coordinate peripheral milling valve pocket after endoporus to coordinate cylindrical, after peripheral milling, hardness is not less than 700HV0.2, and depth of penetration is not less than 0.2mm;
5) at valve pocket base substrate upthrow top gem of a girdle-pendant servo feedback hole, lower servocontrol oil duct and upper servocontrol oil duct;
6) to step 5) in throw the complete valve pocket base substrate of the top gem of a girdle-pendant and adopt heat energy mode to remove burr;
7) to step 6) in remove the complete valve pocket base substrate of burr and carry out sampling Detection, sampling observation rate is not less than 5%, and sample detection be entirely examine;
8) to step 7) in detect qualified valve pocket base substrate carry out cleaning corrosion protection degaussing process, obtain servo valve pocket;
9) to step 9) in carry out cleaning servo valve pocket outward appearance that corrosion protection degaussing is disposed detect qualified after, encapsulation warehouse-in.
In the present invention, servo valve pocket need possess the characteristics such as wear-resisting, corrosion-resistant and shock-resistant, and according to actual needs, part-structure needs higher machining accuracy, and valve pocket coordinates hole size precision to be+0.015mm ~+0.02mm, and accuracy to shape is 0.0025mm; Valve pocket coordinates the dimensional accuracy of cylindrical to be-0.01mm ~-0.015mm, and accuracy to shape is 0.0025mm; Valve pocket coordinates endoporus and valve pocket to coordinate the surface roughness of cylindrical to be 0.2 μm, and the dimensional accuracy in servo feedback hole is+0.005mm ~+0.01mm, and accuracy to shape is 0.0025mm; Lower servocontrol oil duct is 0.01mm relative to the coaxality of upper servocontrol oil duct; Servo feedback hole is 0.035mm relative to the position degree of lower servocontrol oil duct and upper servocontrol oil duct; All the other body structure surfaces are the requirement of machining requirements IT6 class precision.
Beneficial effect: in the present invention, left oil canal, right oil canal, lower servocontrol oil duct and upper servocontrol oil duct are symmetrical arranged about the gyration center of servo valve pocket matrix, with the oil duct of the spool that staggers, close logical oil, and then block servo-system to the manipulation of servovalve, achieve fixed point out of service, to improve the degree of accuracy of servo-system output quantity; Pressure oil one end is entered simultaneously, and another brings out, and can reduce the oil return load of servo-system; Assemble according to set fit up gap and size between servo valve pocket matrix part, not only effectively reduce the noise produced when running, and the transmission performance of each assembly can be ensured, effectively extend the working life of servo valve pocket matrix.
Accompanying drawing explanation
Fig. 1 is the plan view of preferred embodiment of the present invention.
Fig. 2 is A-A place sectional view in Fig. 1.
Fig. 3 is B-B place sectional view in Fig. 1.
Fig. 4 is C-C place sectional view in Fig. 1.
Embodiment
The technological means realized to make the present invention, creation characteristic, reaching object and effect is easy to understand, below in conjunction with concrete diagram, setting forth the present invention further.
See the servo valve pocket of Fig. 1 ~ Fig. 4, comprise valve pocket and coordinate cylindrical 1, upper valve sleeve step cylindrical 2, bottom support chamfering 3, valve pocket inner bore of step 4, servo feedback hole 5, servo valve pocket matrix 6, mounting process breach 7, lower valve sleeve step cylindrical 8, left oil canal 9, upper servocontrol oil duct 10, valve pocket to coordinate endoporus 11, right oil canal 12, balance pressure oil duct 13, lower servocontrol oil duct 14, valve pocket to support end face 15 and valve pocket upper-end surface 16.
In the present embodiment, valve pocket coordinates cylindrical 1 for coordinating with the installation of servo valve body, valve pocket coordinates endoporus 11 for coordinating with the installation of servo spool, upper valve sleeve step cylindrical 2, valve pocket inner bore of step 4, lower valve sleeve step cylindrical 8 are to reduce the step coordinating contact and setting, effectively reduce the resistance feeding back and stir; Valve pocket coordinates cylindrical 1 to be separated by middle lower valve sleeve step cylindrical 8, plays the effect of two end supports; The side of servo valve pocket matrix 6 has mounting process breach 7, acts on spool, impel valve core reset for external reset valve seat through valve pocket; After loading valve body, valve pocket support end face 15 contacts with valve body bottom surface and holds up whole servo valve pocket matrix 6; The bottom support chamfering 3 that servo valve pocket matrix 6 is arranged is convenient to entirety and is loaded valve body, and larger chamfering arranges the surface of contact that effective minimizing valve pocket supports end face 15 and valve body, reduces resistance; The servo feedback hole 5 that servo valve pocket matrix 6 is arranged is for the insertion of system feedback bar bulb, and whole servovalve is enclosed within the effect of feedback rod around Spool rotating; Gyration center about servo valve pocket matrix 6 is symmetrically arranged with left oil canal 9 and right oil canal 12, right oil canal 12 entering for servocontrol pressure oil, and left oil canal 9 is for the off-load oil return of servo-system; Gyration center simultaneously about servo valve pocket matrix 6 is symmetrically arranged with upper servocontrol oil duct 10 and lower servocontrol oil duct 14, is respectively used to the oil-feed to servo variable displacement cylinder two ends and position control; Axial eccentric opening 13, for connecting end chamber portion, valve pocket upper-end surface 16 and other parts of servo valve pocket, ensures the pressure of servo valve pocket each several part, makes valve pocket be in relative balance state in valve body.
In the present embodiment, bottom support chamfering 3 is 30 ° or 60 °.
In the present embodiment, this servo valve pocket need possess the characteristics such as wear-resisting, corrosion-resistant and shock-resistant, and according to actual needs, part-structure needs higher machining accuracy, valve pocket coordinates the dimension precision requirement of endoporus 11 to be+0.015mm ~+0.02mm, and accuracy to shape is 0.0025mm; Valve pocket coordinates the dimensional accuracy of cylindrical 1 to be-0.01mm ~-0.015mm, and accuracy to shape is 0.0025mm; Valve pocket coordinates endoporus 11 and valve pocket to coordinate the surface roughness of cylindrical 1 to be 0.2 μm, and the dimensional accuracy in servo feedback hole 5 is+0.005mm ~+0.01mm, and accuracy to shape is 0.0025mm; Lower servocontrol oil duct 9 is 0.01mm relative to the coaxality of upper servocontrol oil duct 12; Servo feedback hole 5 is 0.035mm relative to the position degree of lower servocontrol oil duct 9 and upper servocontrol oil duct 12; All the other body structure surfaces are the requirement of machining requirements IT6 class precision.
In the present embodiment, servo valve pocket processing method, concrete steps are as follows:
1) body material is chosen, modified polishing bar selected by body material, double dynamical main shaft automatic lathe is adopted to process, and lower servocontrol oil duct 9 and upper servocontrol oil duct 12 adopt and same reamer run through processing simultaneously, ensure the coaxality of lower servocontrol oil duct 9 and upper servocontrol oil duct 12, obtain valve pocket base substrate, and Production development sampling observation detector is installed in double dynamical main shaft automatic lathe, detect critical size, to ensure the machining accuracy produced in batches, effectively control scrappage;
2) to step 1) in obtain valve pocket billet surface carry out gas nitriding process, grinding front surface hardness is not less than 850HV0.2, depth of penetration 0.4 ~ 0.5mm;
3) to step 2) in carry out the valve pocket base substrate that gas nitriding is disposed and carry out fine finishing, honing valve pocket coordinates endoporus 11, and after honing, hardness is not less than 700HV0.2, and depth of penetration is not less than 0.2mm;
4) with step 3) in the valve pocket of honing coordinate endoporus 11 be positioning datum, adopt plug to insert valve pocket and coordinate peripheral milling valve pocket cooperation cylindrical 1 after endoporus 11, after peripheral milling, hardness is not less than 700HV0.2, and depth of penetration is not less than 0.2mm;
5) at valve pocket base substrate upthrow top gem of a girdle-pendant servo feedback hole 5, lower servocontrol oil duct 9 and upper servocontrol oil duct 12;
6) to step 5) in throw the complete valve pocket base substrate of the top gem of a girdle-pendant and adopt heat energy mode to remove burr;
7) to step 6) in remove the complete valve pocket base substrate of burr and carry out sampling Detection, sampling observation rate is not less than 5%, and sample detection be entirely examine;
8) to step 7) in detect qualified valve pocket base substrate carry out cleaning corrosion protection degaussing process, obtain servo valve pocket;
9) to step 8) in carry out cleaning servo valve pocket outward appearance that corrosion protection degaussing is disposed detect qualified after, encapsulation warehouse-in.
More than show and describe basic principle of the present invention and major character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and specification just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.Application claims protection domain is defined by appending claims and equivalent thereof.
Claims (10)
1. servo valve pocket, comprises servo valve pocket matrix, it is characterized in that, servo valve pocket matrix one end is provided with the servo feedback hole of inserting for system feedback bar bulb, and the other end is provided with for coordinating the valve pocket installed to coordinate endoporus with servo spool; Side, servo feedback hole has mounting process breach, and valve pocket cooperation endoporus side is provided with the balance pressure oil duct for connecting chamber portion, valve pocket upper-end surface and servo valve pocket miscellaneous part; And be symmetrically arranged with left oil canal and right oil canal at the gyration center about servo valve pocket matrix; In addition, the gyration center symmetry about servo valve pocket matrix be also provided with lower servocontrol oil duct and on servocontrol oil duct, and upper servocontrol oil duct aperture is less than lower servocontrol oil duct aperture, lower servocontrol oil duct is 0.01mm relative to the coaxality of upper servocontrol oil duct; Servo feedback hole is 0.035mm relative to the position degree of lower servocontrol oil duct and upper servocontrol oil duct.
2. servo valve pocket according to claim 1, is characterized in that, servo valve pocket matrix upper end is provided with valve pocket and coordinates cylindrical.
3. servo valve pocket according to claim 1, is characterized in that, servo valve pocket matrix is provided with upper valve sleeve step cylindrical and lower valve sleeve step cylindrical.
4. servo valve pocket according to claim 1, is characterized in that, periphery, servo feedback hole is provided with valve pocket inner bore of step.
5. servo valve pocket according to claim 1, is characterized in that, servo valve pocket matrix side is provided with valve pocket and supports end face.
6. servo valve pocket according to claim 5, is characterized in that, valve pocket supports end face both sides and is respectively arranged with bottom support chamfering.
7. servo valve pocket according to claim 6, is characterized in that, bottom support chamfer angle is 30 ° ~ 60 °.
8. servo valve pocket according to claim 1, is characterized in that, left oil canal, right oil canal, lower servocontrol oil duct and upper servocontrol oil duct coordinate endoporus circumferentially around valve pocket.
9. servo valve pocket processing method, is characterized in that, concrete steps are as follows:
1) body material is chosen, modified polishing bar selected by body material, double dynamical main shaft automatic lathe is adopted to process, and lower servocontrol oil duct and upper servocontrol oil duct adopt and same reamer are run through processing simultaneously, obtain valve pocket base substrate, and Production development sampling observation detector is installed in double dynamical main shaft automatic lathe;
2) to step 1) in obtain valve pocket billet surface carry out gas nitriding process, grinding front surface hardness is not less than 850HV0.2, depth of penetration 0.35 ~ 0.5mm;
3) to step 2) in carry out the valve pocket base substrate that gas nitriding is disposed and carry out fine finishing, honing valve pocket coordinates endoporus, and after honing, hardness is not less than 700HV0.2, and depth of penetration is not less than 0.2mm;
4) with step 3) in the valve pocket of honing coordinate endoporus to be positioning datum, adopt plug to insert valve pocket and coordinate peripheral milling valve pocket after endoporus to coordinate cylindrical, after peripheral milling, hardness is not less than 700HV0.2, and depth of penetration is not less than 0.2mm;
5) at valve pocket base substrate upthrow top gem of a girdle-pendant servo feedback hole, lower servocontrol oil duct and upper servocontrol oil duct;
6) to step 5) in throw the complete valve pocket base substrate of the top gem of a girdle-pendant and adopt heat energy mode to remove burr;
7) to step 6) in remove the complete valve pocket base substrate of burr and carry out sampling Detection, sampling observation rate is not less than 5%, and sample detection be entirely examine;
8) to step 7) in detect qualified valve pocket base substrate carry out cleaning corrosion protection degaussing process, obtain servo valve pocket.
10. servo valve pocket processing method according to claim 9, is characterized in that, step 3) in valve pocket coordinate hole size precision to be+0.015mm ~+0.02mm, accuracy to shape is 0.0025mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410715773.8A CN104481950B (en) | 2014-11-29 | 2014-11-29 | Servo valve sleeve and machining method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410715773.8A CN104481950B (en) | 2014-11-29 | 2014-11-29 | Servo valve sleeve and machining method thereof |
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| CN104481950A true CN104481950A (en) | 2015-04-01 |
| CN104481950B CN104481950B (en) | 2017-03-22 |
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| CN201410715773.8A Active CN104481950B (en) | 2014-11-29 | 2014-11-29 | Servo valve sleeve and machining method thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105179352A (en) * | 2015-10-13 | 2015-12-23 | 无锡鹰贝精密轴承有限公司 | Precise valve sleeve |
| CN105643206A (en) * | 2015-12-11 | 2016-06-08 | 长春航空液压控制有限公司 | Processing method for inner hole of ultra-precise valve sleeve |
| CN106625146A (en) * | 2015-10-29 | 2017-05-10 | 中国航空工业第六八研究所 | High-precision rapid match-grinding method for overlap amount of hydraulic matching parts for excavator |
| CN109306979A (en) * | 2018-10-29 | 2019-02-05 | 北京航天发射技术研究所 | A kind of machine liquid throttling control valve design method based on mechanism displacement speed planning |
| CN110076529A (en) * | 2019-05-15 | 2019-08-02 | 山西航天清华装备有限责任公司 | A kind of weak rigid radial porous system precision valve pocket stable state processing method |
| CN110425188A (en) * | 2019-07-16 | 2019-11-08 | 北京实验工厂有限责任公司 | A kind of stainless steel material Servo Valve's Slide Valve pair couple surface treatment method |
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| CN201636102U (en) * | 2010-03-29 | 2010-11-17 | 上海立新液压有限公司 | Screw-in cartridge electromagnetic seat valve |
| CN201794767U (en) * | 2010-07-29 | 2011-04-13 | 杭州力龙液压有限公司 | Control valve with constant power |
| CN204327623U (en) * | 2014-11-29 | 2015-05-13 | 南京萨伯工业设计研究院有限公司 | Servo valve pocket |
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| WO1995004887A1 (en) * | 1993-08-11 | 1995-02-16 | Mannesmann Rexroth Gmbh | Valve, in particular distributing valve |
| CN201636102U (en) * | 2010-03-29 | 2010-11-17 | 上海立新液压有限公司 | Screw-in cartridge electromagnetic seat valve |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105179352A (en) * | 2015-10-13 | 2015-12-23 | 无锡鹰贝精密轴承有限公司 | Precise valve sleeve |
| CN106625146A (en) * | 2015-10-29 | 2017-05-10 | 中国航空工业第六八研究所 | High-precision rapid match-grinding method for overlap amount of hydraulic matching parts for excavator |
| CN106625146B (en) * | 2015-10-29 | 2019-03-19 | 中国航空工业第六一八研究所 | A kind of excavator quick match grinding method of high-precision hydraulic couple lap |
| CN105643206A (en) * | 2015-12-11 | 2016-06-08 | 长春航空液压控制有限公司 | Processing method for inner hole of ultra-precise valve sleeve |
| CN109306979A (en) * | 2018-10-29 | 2019-02-05 | 北京航天发射技术研究所 | A kind of machine liquid throttling control valve design method based on mechanism displacement speed planning |
| CN109306979B (en) * | 2018-10-29 | 2020-05-08 | 北京航天发射技术研究所 | Mechanical hydraulic throttling control valve design method based on mechanism displacement speed planning |
| CN110076529A (en) * | 2019-05-15 | 2019-08-02 | 山西航天清华装备有限责任公司 | A kind of weak rigid radial porous system precision valve pocket stable state processing method |
| CN110425188A (en) * | 2019-07-16 | 2019-11-08 | 北京实验工厂有限责任公司 | A kind of stainless steel material Servo Valve's Slide Valve pair couple surface treatment method |
| CN110425188B (en) * | 2019-07-16 | 2020-10-23 | 北京实验工厂有限责任公司 | Surface treatment method for sliding valve auxiliary part of stainless steel servo valve |
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| CN104481950B (en) | 2017-03-22 |
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