CN110788572A - Method for processing valve shell with deep-hole inner annular groove - Google Patents
Method for processing valve shell with deep-hole inner annular groove Download PDFInfo
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- CN110788572A CN110788572A CN201911049277.2A CN201911049277A CN110788572A CN 110788572 A CN110788572 A CN 110788572A CN 201911049277 A CN201911049277 A CN 201911049277A CN 110788572 A CN110788572 A CN 110788572A
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- valve shell
- annular groove
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- deep hole
- welding
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- 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
Abstract
The invention discloses a processing method of a valve shell with a deep hole inner annular groove, wherein the valve shell with the deep hole inner annular groove is used for automatic oil supplement of a floater oil tank, the requirements on the size of the annular groove and the precision of a sealing surface are strict, the processing method divides the valve shell into an upper part and a lower part from the annular groove, and then the upper part and the lower part are processed in a split mode and then are combined and processed, the step of processing the annular groove in the deep hole is avoided, the processing of the annular groove and the sealing surface is more convenient to implement, the processing precision is improved, the size of the valve shell and the precision of the sealing surface are ensured, a matched step seam allowance is arranged at the joint of a first valve shell and a second valve shell and is used for positioning during welding, and the excessive joint when the first valve shell and; the internal processing of the valve shell is completed in a split mode, and the valve shell is simple and convenient.
Description
Technical Field
The invention relates to the technical field of machining, in particular to a method for machining a valve shell with a deep-hole inner annular groove.
Background
In an aircraft engine test bed fuel oil system, a valve shell part is arranged in a float oil tank for automatically oiling, the valve shell part is a part with a deep hole internally provided with an annular groove and a sealing surface structure, the outer diameter of the annular groove in the deep hole is larger than the inner diameter of the deep hole, the drawing size cannot be machined due to the fact that a suitable cutter is not available in the previous deep hole internal annular groove machining, the sealing surface cannot meet the precision requirement, the automatic oil-replenishing flow of the float oil tank is small, the sealing is not tight, and the like, so that the test run of an engine is influenced.
Disclosure of Invention
The invention provides a method for processing a valve shell with a deep-hole inner annular groove, which aims to solve the technical problems that the drawing size cannot be processed and the sealing surface cannot meet the precision requirement due to lack of a suitable cutter in the deep-hole inner annular groove processing.
According to one aspect of the invention, a method for processing a valve shell with an annular groove in a deep hole is provided, a deep hole for accommodating a pressure rod is arranged at a first end of the valve shell, an annular groove is arranged at the bottom end of the deep hole, the diameter of the annular groove is larger than that of the deep hole, an oil inlet is arranged at a second end of the valve shell, the oil inlet is communicated with the annular groove, a sealing surface is arranged at a position where the annular groove is communicated with the oil inlet, and an oil outlet is arranged on the annular groove, the method for processing the valve shell comprises the following steps:
1) separating the valve shell from the middle of the annular groove to form a first valve shell and a second valve shell, and respectively processing the first valve shell and the second valve shell;
2) setting a connecting part of the first valve shell and the second valve shell as matched step rabbets for positioning when the first valve shell and the second valve shell are combined and welded;
3) processing the deep hole and the annular groove I of the first valve shell to the size, and reserving certain combination of the excircle of the first valve shell and then processing allowance; processing an oil inlet, an annular groove II and a sealing surface of a second valve shell to the size, and reserving certain combination of the excircle of the second valve shell and then processing allowance;
4) combining and welding the first valve shell and the second valve shell into a whole;
5) turning the outer circle of the valve shell welded into a whole to a required size;
6) and processing the oil outlet.
Furthermore, the spigot connection between the first valve shell and the second valve shell is in transition fit-0.01 to +0.01 mm.
Furthermore, a welding groove is formed in a step seam allowance of the first valve shell, and a welding groove is formed in a step seam allowance of the second valve shell.
Further, the welding bevel on the first valve shell is a 45-degree chamfer, and the welding bevel on the second valve shell is a 45-degree chamfer.
Further, in the step 4), during combined welding, a welding deformation restraining device is inserted into the deep hole to connect and fix the first valve shell and the second valve shell so as to reduce welding deformation.
Furthermore, the welding deformation restraint device comprises a bolt, a compression gasket and a compression nut, the bolt is inserted into the oil inlet of the first valve shell and the deep hole of the second valve shell, the compression gasket and the compression nut are adopted for fastening, and then welding is started.
Further, in the step 6), a notch is machined in the annular groove by adopting linear cutting and is used as an oil outlet.
Further, turning is adopted in the steps 3) and 5).
Further, after the step 6), a threaded hole is machined in the upper end of the first valve shell, and a key groove is milled in the lower end of the second valve shell.
The invention has the following beneficial effects:
according to the processing method of the valve shell, the valve shell is divided into an upper part and a lower part from the annular groove and then is processed in a split mode and then is processed in a combined mode, the step of processing the annular groove in a deep hole is avoided, the processing of the annular groove and the sealing surface is more convenient to implement, the processing precision is improved, the size of the valve shell and the precision of the sealing surface are guaranteed, a matched step spigot is arranged at the connecting position of the first valve shell and the second valve shell and used for positioning during welding, and the situation that the first valve shell and the second valve shell are excessively jointed to influence the size when being combined is avoided; the inner processing of the valve shell is finished in a split mode, the valve shell is simple and convenient to use, a certain margin is reserved on the outer circle, welding slag and other impurities are easy to remain on the surface after welding, and the outer circle after combined welding is turned, so that the appearance quality is better; when the valve shell is processed in a split mode, only deep holes, annular grooves and oil inlets are processed, the structures are concentric, other structures such as oil outlets are processed after combined welding, and when the valve shell I and the valve shell II are combined and butted, only step rabbets are matched with each other, radial alignment operation is not needed, and operation is very simple and convenient.
In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a front view of a shutter housing of the present invention having a deep-hole internal annular groove;
FIG. 2 is a left side view of the shutter housing of the present invention having a deep-hole internal annular groove;
FIG. 3 is a front view of a first shutter housing of the present invention;
FIG. 4 is a front view of a second shutter housing of the present invention;
fig. 5 is a structural schematic diagram of a combined welding and welding deformation restraining device of the first valve shell and the second valve shell.
Illustration of the drawings:
1. a shutter housing; 11. a first valve shell; 12. a second valve shell; 2. deep holes; 3. an annular groove; 31. a first annular groove; 32. a second annular groove; 4. an oil inlet; 5. a sealing surface; 6. a welding deformation restraint device; 61. a bolt; 62. compressing the gasket; 63. and (5) pressing the nut.
Detailed Description
The embodiments of the invention will be described in detail below with reference to the accompanying drawings, but the invention can be embodied in many different forms, which are defined and covered by the following description.
FIG. 1 is a front view of a shutter housing of the present invention having a deep-hole internal annular groove; FIG. 2 is a left side view of the shutter housing of the present invention having a deep-hole internal annular groove; FIG. 3 is a front view of a first shutter housing of the present invention; FIG. 4 is a front view of a second shutter housing of the present invention; fig. 5 is a structural schematic diagram of a combined welding and welding deformation restraining device of the first valve shell and the second valve shell.
As shown in fig. 1 to 5, in the method for processing the valve housing having the deep-hole inner annular groove of the present embodiment, a deep hole 2 for accommodating a pressure rod is arranged at a first end of the valve housing 1, an annular groove 3 is arranged at a bottom end of the deep hole 2, a diameter of the annular groove 3 is larger than that of the deep hole 2, an oil inlet 4 is arranged at a second end of the valve housing 1, the oil inlet 4 is communicated with the annular groove 3, a sealing surface 5 is arranged at a position where the annular groove 3 is communicated with the oil inlet 4, and an oil outlet is arranged on the annular groove 3:
1) separating the valve shell 1 from the middle position of the annular groove 3 to form a first valve shell 11 and a second valve shell 12, and respectively processing the first valve shell 11 and the second valve shell 12, wherein the first valve shell 11 is shown in figure 3, and the second valve shell 12 is shown in figure 4;
2) setting the joint of the first valve shell 11 and the second valve shell 12 as matched step rabbets for positioning when the first valve shell 11 and the second valve shell 12 are combined and welded;
3) processing the deep hole 2 and the annular groove 31 of the first valve shell 11 to the size, and reserving a certain combination of machining allowance for the outer circle of the first valve shell 11, wherein the machining allowance is 1-2 mm; processing the oil inlet 4, the annular groove II 32 and the sealing surface 5 of the second valve shell 12 to the size, and reserving a certain combination of machining allowance for the excircle of the second valve shell 12, wherein the machining allowance is 1-2 mm;
4) combining and welding the first valve shell 11 and the second valve shell 12 into a whole;
5) turning the outer circle of the valve shell welded into a whole to a required size;
6) and processing an oil outlet.
The deep hole of valve casing is about 120mm, and the diameter is about 25mm, and the major diameter of annular groove is about 40 mm. The valve shell is arranged in the oil tank, the pressure lever is arranged in the valve shell, the sealing gasket is arranged at the contact part of the lower end of the pressure lever and the valve shell, and the pressure lever is connected with the floating ball. When the oil level rises, the floating ball rises to press the pressure rod downwards until the sealing surface is tightly pressed, and oil is not fed any more. When the oil in the oil tank is consumed, the pressure rod is lifted upwards when the floating ball descends, and the oil is automatically replenished. If the sealing surface (narrower) of the valve shell is not processed well, even if the floating ball rises and the pressure rod presses the sealing surface, the oil cannot be sealed, and the oil can continuously enter the oil tank due to certain pressure of the entered oil, so that the oil can overflow the oil tank possibly; if the machining size of the annular groove is not enough, the oil in the oil tank is consumed too fast, and the test run of the engine can be influenced due to the fact that the flow of the automatic oil supplementing liquid is not enough.
The method for processing the valve shell of the embodiment divides the valve shell into an upper part and a lower part from the annular groove and then performs combined processing, avoids the step of processing the annular groove in a deep hole, enables the processing of the annular groove and the sealing surface to be more convenient to implement, improves the processing precision, ensures the size of the valve shell and the precision of the sealing surface, and avoids the influence on the internal size of the valve shell due to excessive joint when the first valve shell and the second valve shell are combined because the first valve shell and the second valve shell are provided with matched step rabbets for positioning during welding; the inner processing of the valve shell is finished in a split mode, the valve shell is simple and convenient to use, a certain margin is reserved on the outer circle, welding slag and other impurities are easy to remain on the surface after welding, and the outer circle after combined welding is turned, so that the appearance quality is better; when the valve shell is processed in a split mode, only deep holes, annular grooves and oil inlets are processed, the structures are concentric, other structures such as oil outlets are processed after combined welding, and when the valve shell I and the valve shell II are combined and butted, only step rabbets are matched with each other, radial alignment operation is not needed, and operation is very simple and convenient.
In this embodiment, the spigot connection between the first valve housing 11 and the second valve housing 12 is transition fit-0.01 to +0.01 mm. The transition fit can guarantee that the interior of the first valve shell and the interior of the second valve shell are concentric, and compared with the clearance fit, the transition fit guarantees that the concentric precision is higher.
In this embodiment, a welding groove is formed at the step seam allowance of the first valve housing 11, and a welding groove is formed at the step seam allowance of the second valve housing 12. The welding groove is filled with the welding flux during welding, and the purpose of the welding groove is to ensure the welding penetration of the part, so that the welding strength is ensured. In this embodiment, the welding grooves on the first valve housing 11 and the second valve housing 12 are both opened outwards and blocked by step rabbets, so as to prevent solder from entering the annular groove 3 through the connecting position to affect the internal structure and the precision of the annular groove 3. Preferably, the welding bevel on the first valve housing 11 is a chamfer of 45 degrees, and the welding bevel on the second valve housing 12 is a chamfer of 45 degrees. After the combined welding, the welding seam is 90 degrees. Preferably, in order to fill more space for the solder, the step seam allowance is set to be larger in step width close to the outer wall of the valve shell and smaller in step width close to the inner wall of the valve shell, so that most positions of the joint are welded, and the joint strength of the first valve shell and the second valve shell is improved.
In the embodiment, in the step 4), during the combined welding, the welding deformation restraining device 6 is inserted into the deep hole 2 to connect and fix the first valve housing 11 and the second valve housing 12, so as to reduce the welding deformation. The interior of the valve shell is hollow, deformation is easy to generate during welding, and therefore the valve shell is particularly provided with a welding deformation restraining device which is inserted into a deep hole of the valve shell and used for supporting the valve shell, and welding deformation is reduced. As shown in fig. 5, the welding deformation restraining device 6 includes a bolt 61, a pressing washer 62 and a pressing nut 63, and after the bolt 61 is inserted into the oil inlet 4 of the first valve housing 11 and the deep hole 2 of the second valve housing 12, the pressing washer 62 and the pressing nut 63 are used for fastening, and then welding is started. The bolt 61 is inserted into the hollow cavity of the valve shell to form support, the axial positions of the first valve shell 11 and the second valve shell 12 are fixed by the compression gasket 62 and the compression nut 63, the first valve shell 11 or the second valve shell 12 cannot deviate during welding, and the position degree and the precision of a joint are guaranteed.
In the embodiment, in the step 6), a notch is machined on the annular groove 3 by adopting linear cutting and is used as an oil outlet. Turning is adopted in both the step 3) and the step 5). And 6), machining a threaded hole at the upper end of the first valve shell 11, and milling a key groove at the lower end of the second valve shell 12. Oil-out, screw hole and keyway all process after the combination welding, and the structure that makes when the combination welding valve casing one and valve casing two is central symmetry on the one hand, during the combination butt joint, only need the step tang match each other can, and do not need radial alignment operation, on the other hand, valve casing one and two geometric dimensions of valve casing are equal symmetry, and it is more even to be heated during the welding, and welding deformation is little.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The processing method of the valve shell with the deep-hole inner annular groove is characterized in that a deep hole (2) used for accommodating a pressure rod is formed in the first end of the valve shell (1), an annular groove (3) is formed in the bottom end of the deep hole (2), the diameter of the annular groove (3) is larger than that of the deep hole (2), an oil inlet (4) is formed in the second end of the valve shell (1), the oil inlet (4) is communicated with the annular groove (3), a sealing surface (5) is arranged at the position where the annular groove (3) is communicated with the oil inlet (4), and an oil outlet is formed in the annular groove (3).
1) Separating the valve shell (1) from the middle position of the annular groove (3) to form a first valve shell (11) and a second valve shell (12) and processing the first valve shell and the second valve shell respectively;
2) setting the joint of the first valve shell (11) and the second valve shell (12) as a matched step spigot for positioning when the first valve shell (11) and the second valve shell (12) are welded in a combined manner;
3) processing a deep hole (2) and an annular groove (31) of a first valve shell (11) to reach the size, and reserving certain combination of the excircle of the first valve shell (11) and then processing allowance; processing an oil inlet (4), an annular groove II (32) and a sealing surface (5) of a second valve shell (12) to the size, and reserving certain combination of the excircle of the second valve shell (12) and then processing allowance;
4) combining and welding the first valve shell (11) and the second valve shell (12) into a whole;
5) turning the outer circle of the valve shell welded into a whole to a required size;
6) and processing the oil outlet.
2. The method for processing a shutter housing having an annular groove in a deep hole according to claim 1,
the spigot connection between the first valve shell (11) and the second valve shell (12) is in transition fit-0.01 to +0.01 mm.
3. The method for processing a shutter housing having an annular groove in a deep hole according to claim 2,
a welding groove is arranged at a step seam allowance of the first valve shell (11),
and a welding groove is arranged at a step seam allowance of the second valve shell (12).
4. The method for processing a shutter housing having an annular groove in a deep hole according to claim 3,
the welding bevel on the first valve shell (11) is a chamfer of 45 degrees,
and a welding bevel on the second valve shell (12) is a chamfer of 45 degrees.
5. The method for processing a shutter housing having an annular groove in a deep hole according to claim 1,
in the step 4), during combined welding, a welding deformation restraining device (6) is inserted into the deep hole (2) to connect and fix the first valve shell (11) and the second valve shell (12) so as to reduce welding deformation.
6. The method for processing a shutter housing having an annular groove in a deep hole according to claim 5,
the welding deformation restraint device (6) comprises a bolt (61), a compression gasket (62) and a compression nut (63), and after the bolt (61) is inserted into the oil inlet (4) of the first valve shell (11) and the deep hole (2) of the second valve shell (12), the compression gasket (62) and the compression nut (63) are adopted for fastening, and then welding is started.
7. The method for processing a shutter housing having an annular groove in a deep hole according to claim 1,
in the step 6), a notch is machined on the annular groove (3) by adopting linear cutting and is used as an oil outlet.
8. The method for processing a shutter housing having an annular groove in a deep hole according to claim 1,
turning is adopted in both the step 3) and the step 5).
9. The method for processing a shutter housing having an annular groove in a deep hole according to claim 1,
and 6), machining a threaded hole at the upper end of the first valve shell (11), and milling a key groove at the lower end of the second valve shell (12).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911049277.2A CN110788572B (en) | 2019-10-31 | 2019-10-31 | Method for processing valve shell with deep-hole inner annular groove |
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| CN201911049277.2A CN110788572B (en) | 2019-10-31 | 2019-10-31 | Method for processing valve shell with deep-hole inner annular groove |
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| CN110788572A true CN110788572A (en) | 2020-02-14 |
| CN110788572B CN110788572B (en) | 2021-10-12 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114654167A (en) * | 2022-02-15 | 2022-06-24 | 中国工程物理研究院激光聚变研究中心 | Manufacturing method of orthogonal ellipsoid gold black cavity |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2934185A1 (en) * | 2008-07-28 | 2010-01-29 | Adel | METHOD FOR PRODUCING A COMPRESSOR VIROLE |
| CN102501020A (en) * | 2011-11-10 | 2012-06-20 | 中机洛阳轴承科技有限公司 | Method for machining separated type outer ring of small and medium-sized thin-wall crossed cylindrical roller turntable bearing |
| CN202877797U (en) * | 2012-10-29 | 2013-04-17 | 上海东方泵业(集团)有限公司 | Welding device for submerged pump supporting tube |
| CN105921955A (en) * | 2016-06-22 | 2016-09-07 | 山西平阳重工机械有限责任公司 | Machining method of high-precision step deep hole part |
| CN106531259A (en) * | 2016-11-14 | 2017-03-22 | 上海第机床厂有限公司 | Claw shell assembly and machining method |
| CN108188661A (en) * | 2017-12-27 | 2018-06-22 | 哈尔滨汽轮机厂有限责任公司 | A kind of processing method for measuring the deep hole in body structure |
-
2019
- 2019-10-31 CN CN201911049277.2A patent/CN110788572B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2934185A1 (en) * | 2008-07-28 | 2010-01-29 | Adel | METHOD FOR PRODUCING A COMPRESSOR VIROLE |
| CN102501020A (en) * | 2011-11-10 | 2012-06-20 | 中机洛阳轴承科技有限公司 | Method for machining separated type outer ring of small and medium-sized thin-wall crossed cylindrical roller turntable bearing |
| CN202877797U (en) * | 2012-10-29 | 2013-04-17 | 上海东方泵业(集团)有限公司 | Welding device for submerged pump supporting tube |
| CN105921955A (en) * | 2016-06-22 | 2016-09-07 | 山西平阳重工机械有限责任公司 | Machining method of high-precision step deep hole part |
| CN106531259A (en) * | 2016-11-14 | 2017-03-22 | 上海第机床厂有限公司 | Claw shell assembly and machining method |
| CN108188661A (en) * | 2017-12-27 | 2018-06-22 | 哈尔滨汽轮机厂有限责任公司 | A kind of processing method for measuring the deep hole in body structure |
Non-Patent Citations (1)
| Title |
|---|
| 黄志坚: "《液压元件安装调试与故障维修：图解▪案例》", 31 October 2013 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114654167A (en) * | 2022-02-15 | 2022-06-24 | 中国工程物理研究院激光聚变研究中心 | Manufacturing method of orthogonal ellipsoid gold black cavity |
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