CN111618386B - Fixture for precisely machining working edge of valve pocket of servo valve - Google Patents
Fixture for precisely machining working edge of valve pocket of servo valve Download PDFInfo
- Publication number
- CN111618386B CN111618386B CN202010435007.1A CN202010435007A CN111618386B CN 111618386 B CN111618386 B CN 111618386B CN 202010435007 A CN202010435007 A CN 202010435007A CN 111618386 B CN111618386 B CN 111618386B
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- positioning
- valve sleeve
- fixture
- machining
- valve
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H11/00—Auxiliary apparatus or details, not otherwise provided for
- B23H11/003—Mounting of workpieces, e.g. working-tables
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
Abstract
The invention relates to a finish machining clamp in an electric machining process, in particular to a clamp for machining a valve sleeve of a servo valve. The fixture for precisely machining the working edge of the servo valve sleeve comprises a fixture seat, a positioning and locking device and a positioning mandrel. The fixture seat is fixed on a clamping platform of the electric machining equipment, a valve sleeve to be machined is sleeved between the positioning mandrels at two sides, the positioning locking device comprises a step-shaped bolt, one end of the step-shaped bolt is connected with a transition mandrel sleeved with a pre-compression spring, and the positioning locking device and the positioning mandrel are in a flexible point contact form by means of a steel ball. The invention ensures that the size and the form and position tolerance of the throttling edge of each square hole meet the technical requirements, has high qualification rate and high productivity and saves the production cost.
Description
Technical Field
The invention relates to two finish machining fixtures of electric sparks and slow-moving wires, in particular to a fixture for machining a square hole of a valve sleeve of a servo valve.
Background
The valve sleeve is a core piece of the servo valve, the requirements on size precision and working edge verticality are extremely high, particularly the requirement on four groups of working throttling edges coplanarity is only a few micrometers, and the quality of the valve sleeve is a key point for processing, and the quality of the valve sleeve directly influences the success or failure of axial pneumatic and hydraulic precise match grinding of a follow-up slide valve assembly. The slow wire cutting of the throttling side square hole needs to be finished by twice clamping, the repeated precision of the twice clamping and positioning is very important, the repeated precision and the force of the clamping are controlled only by experience, the coplanarity is extremely poor, and the rejection rate is extremely high.
Disclosure of Invention
The invention aims to reduce or eliminate the defects in the existing machining and provides a clamp for precisely machining the working edge of a valve sleeve of a servo valve. The invention ensures that the size and the form and position tolerance of the throttling edge of each square hole meet the technical requirements, has high qualification rate and high productivity and saves the production cost.
The invention is realized in this way, the servo valve pocket work edge precision finishing uses the clamp, it includes clamp seat, positions the locking device and positions the dabber, the said clamp seat is fixed on the clamping platform of the electric processing equipment, the valve pocket to be processed is fitted in the middle of locating the dabber of both sides, the said positioning the locking device includes a step-like bolt, its one end connects a transition dabber that is fitted with the spring of precompression quantity, position and lock the device and position the spindle and take the form of flexible point contact with the help of the steel ball. And the direction pin is used for assisting in positioning the machining direction of the valve sleeve.
And because the requirement of the electric machining on the clamping force is smaller, the clamping force is controlled by limiting the spring, and compared with other modes, the electric machining clamping device is more reliable and practical and is more convenient to operate. In the above positioning and locking device, the stiffness and the precompression of the compression spring (i.e. the axial relative assembly position between the step-shaped bolt and the transition mandrel) are the key points for the first two-stage adjustment to ensure the clamping tightness and the consistency of the clamping position of the valve sleeve to be processed. The axial clearance of the step surface of the step bolt in the positioning and locking device before the step bolt is locked with the pressure bearing surface of the clamp seat is a third-stage adjusting key point for ensuring the clamping tightness and the clamping position consistency of the valve sleeve to be processed. The positioning core shaft and the inner hole of the valve sleeve are in precise fit, so that the lateral inclination of the valve sleeve to be machined during clamping can be reduced.
In order to ensure the coplanarity of the working throttling edges of the valve sleeve, the two times of clamping need to be completely consistent as much as possible, and the repeatability precision is high. Therefore, the clamping force is consistent, the force is moderate, and the lateral inclination and the clamping deformation are avoided during clamping.
The clamp has high precision, can cut two pieces at a time, and improves the production efficiency. Meanwhile, the fixture is high in universality and interchangeability and can be used for machining valve sleeves of different specifications.
By utilizing the invention, the slow wire-moving process can effectively and simultaneously cut a plurality of groups of throttling edge square holes of two valve sleeves, and ensure that the size and form and position tolerance of the throttling edge of each square hole meet the technical requirements, the qualification rate is high, the productivity is high, and the production cost is saved.
Drawings
The invention is further described with reference to the accompanying drawings in which:
FIG. 1 is a side view of the present invention;
fig. 2 is a schematic cross-sectional view of M-M in fig. 1, i.e., a schematic internal cross-sectional view of the clamp.
Detailed Description
Referring to fig. 2, the clamp for precisely machining the working edge of the servo valve sleeve comprises a clamp seat 9, a positioning locking device and positioning mandrels 6 and 8, wherein the clamp seat is fixed on a clamping platform of an electric machining device, the valve sleeve 7 to be machined is sleeved between the positioning mandrels at two sides, the positioning locking device comprises a step-shaped bolt 2, one end of the step-shaped bolt is connected with a transition mandrel 4 sleeved with a pre-compression spring 3, and the positioning locking device and the positioning mandrel are in flexible point contact by virtue of a steel ball 5.
During processing, the fixture seat is installed firmly, and the positioning core shaft 6 is installed after careful correction. And then the positioning core shaft 8 is plugged into the inner hole of the valve sleeve, and the valve sleeve and the positioning core shaft are together arranged in the clamp seat and pushed to the installation position. Then the left positioning and locking device (in which the relative positions of the parts are adjusted and fixed) is installed into the fixture seat 9 together. The valve sleeve is rotated while the bolt is screwed lightly, the hand feeling is smooth without clamping stagnation, the circumferential pin 1 is laterally inserted, and the bolt is screwed (the step depth for positioning the bolt needs to be designed accurately, the operation is rechecked, and the clamping force of the valve sleeve is finally determined). And then, slowly moving the wire, loosening the bolt after cutting in one direction, pulling out the direction pin 1, rotating the valve sleeve by 90 degrees, inserting the direction pin, and screwing the bolt again. And after all the square holes are completely finished, the left positioning and locking device is dismounted, and the valve sleeve and the positioning mandrel are pushed out from the left side. When the valve sleeves of different specifications are machined, the positioning core shaft and the positioning core shaft can be replaced. The fixture can also be used for electric spark machining of valve sleeves with only one-sided square hole.
The fixture can also be used for electric spark machining of valve sleeves with only one-sided square hole.
Claims (4)
1. The fixture for precisely machining the working edge of the servo valve sleeve comprises a fixture seat, a positioning locking device and a positioning mandrel, wherein the fixture seat is fixed on a clamping platform of an electric machining device.
2. The fixture for precisely machining the working edge of the valve sleeve of the servo valve as recited in claim 1, wherein the rigidity and the compression amount of the spring, i.e., the axial relative assembly position between the stepped bolt and the transition mandrel, correspond to the length and the wall thickness of the valve sleeve to be machined.
3. The fixture for precisely machining the working edge of the valve sleeve of the servo valve as recited in claim 1, wherein the axial dimension of the step surface of the step bolt in the positioning and locking device corresponds to the length and the wall thickness of the valve sleeve to be machined.
4. The jig for precisely machining the working edge of the valve sleeve of the servo valve as recited in claim 1, wherein the positioning core shaft and the inner hole of the valve sleeve are in clearance fit, and the tolerance precision is on the order of μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010435007.1A CN111618386B (en) | 2020-05-21 | 2020-05-21 | Fixture for precisely machining working edge of valve pocket of servo valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010435007.1A CN111618386B (en) | 2020-05-21 | 2020-05-21 | Fixture for precisely machining working edge of valve pocket of servo valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111618386A CN111618386A (en) | 2020-09-04 |
| CN111618386B true CN111618386B (en) | 2023-02-03 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010435007.1A Active CN111618386B (en) | 2020-05-21 | 2020-05-21 | Fixture for precisely machining working edge of valve pocket of servo valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111618386B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20080072809A (en) * | 2008-07-19 | 2008-08-07 | 김원준 | A jig device for processing a body of safety lock valve |
| CN101293324A (en) * | 2007-04-29 | 2008-10-29 | 上海诺玛液压系统有限公司 | Spark-erosion machininging clamping apparatus square edged orifice of valve housing in electrohydraulic servo valve |
| CN101450407A (en) * | 2008-12-19 | 2009-06-10 | 上海诺玛液压系统有限公司 | Electro-hydraulic servo valve sleeve throttling square-hole processing tool |
| CN202129655U (en) * | 2011-06-08 | 2012-02-01 | 鑫耀机械制造（大连）有限公司 | Centering fixture of electromagnetic valve |
| CN202894781U (en) * | 2012-09-26 | 2013-04-24 | 溧阳市瑞丰金属制品有限公司 | Positioning clamp for processing excircle of valve core |
| CN106041233A (en) * | 2016-08-09 | 2016-10-26 | 上海脉迪机电技术有限公司 | Square throttling hole linear cutting positioning tool of ultrahigh-precision servo valve sleeve and method thereof |
| CN206010075U (en) * | 2016-09-10 | 2017-03-15 | 无锡微研精微机械技术有限公司 | A kind of control valve fuel feed hole spark machined frock clamp |
-
2020
- 2020-05-21 CN CN202010435007.1A patent/CN111618386B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101293324A (en) * | 2007-04-29 | 2008-10-29 | 上海诺玛液压系统有限公司 | Spark-erosion machininging clamping apparatus square edged orifice of valve housing in electrohydraulic servo valve |
| KR20080072809A (en) * | 2008-07-19 | 2008-08-07 | 김원준 | A jig device for processing a body of safety lock valve |
| CN101450407A (en) * | 2008-12-19 | 2009-06-10 | 上海诺玛液压系统有限公司 | Electro-hydraulic servo valve sleeve throttling square-hole processing tool |
| CN202129655U (en) * | 2011-06-08 | 2012-02-01 | 鑫耀机械制造（大连）有限公司 | Centering fixture of electromagnetic valve |
| CN202894781U (en) * | 2012-09-26 | 2013-04-24 | 溧阳市瑞丰金属制品有限公司 | Positioning clamp for processing excircle of valve core |
| CN106041233A (en) * | 2016-08-09 | 2016-10-26 | 上海脉迪机电技术有限公司 | Square throttling hole linear cutting positioning tool of ultrahigh-precision servo valve sleeve and method thereof |
| CN206010075U (en) * | 2016-09-10 | 2017-03-15 | 无锡微研精微机械技术有限公司 | A kind of control valve fuel feed hole spark machined frock clamp |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111618386A (en) | 2020-09-04 |
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