CN102494170A - Surfacing method of sealing surface of valve - Google Patents
Surfacing method of sealing surface of valve Download PDFInfo
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- CN102494170A CN102494170A CN2011103805494A CN201110380549A CN102494170A CN 102494170 A CN102494170 A CN 102494170A CN 2011103805494 A CN2011103805494 A CN 2011103805494A CN 201110380549 A CN201110380549 A CN 201110380549A CN 102494170 A CN102494170 A CN 102494170A
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- valve body
- valve
- hole
- surfacing
- welding
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Abstract
The invention relates to a surfacing method of a sealing surface of a valve. The innovation points are as follows: the method comprises the following steps of: firstly, processing a center hole of a valve body on a blank of the valve body; then, drilling a small hole in the bottom of the center hole of the valve body, wherein the small hole is concentric with the center hole and has a smaller diameter than the center hole; and surfacing hard alloy on a shaft shoulder surface between the small hole and the center hole of the valve body. The small hole which is smaller than a hole of a valve seat is drilled in the bottom of the center hole of the valve body; and surfacing is carried out on the annular shaft shoulder surface between the small hole and the center hole of the valve body, so that the internal stress of a surfacing layer can be released to avoid generating cracks. In addition, the inner wall of the surfacing layer is not in contact with base metal, therefore, no fusing phenomenon exists, the hardness of the surfacing layer is ensured, and the sealing performance is ensured. Moreover, a surfacing material for the position of the hole of the valve seat is omitted.
Description
Technical field
The present invention relates to a kind of valve sealing surface build-up welding method, particularly a kind of valve sealing surface build-up welding method that is not prone to crackle and economical with materials.
Background technique
Stop valve is to use the most a kind of valve, is used to switch on or off the pipeline medium.Its valve body has annular sealing surface one, and this annular sealing surface can cooperate cut-out or the conducting that realizes pipeline medium with valve core sealed cover.When stop valve used in the HTHP system, that valve sealing face needs was high temperature resistant, erosion resistance, antifraying property are good, also will have requirements such as certain rigidity, good processability, and common way is a pile-up welding hard alloy on sealing surface.Because serviceability temperature, pressure, the medium of valve have nothing in common with each other, the material of valve body is also different, and the surfacing electrode of use and welding procedure are also different.Be limited to present manufacturing technology level, valve body deep hole pile-up welding hard alloy is main with manual electric arc pile up welding still.
Common valve body material as 25,12Cr1MoV etc. is because welding performance is better, is difficult for producing defective after the built-up welding.But materials such as the valve body material of, ultra supercritical system overcritical for being used for such as F91, F92 adopt that common overlaying method almost absolutely cracks etc. weld defects.
When carrying out the sealing surface hard alloy overlay welding of inside nominal diameter DN32-65mm valve body; Common way is as shown in Figure 1; At first on valve body blank 1, process valve body mesopore 2; Adopt special-purpose cutting tool to cut the annular stack weld groove in valve body mesopore 2 bottoms, pile-up welding hard alloy 3 in the built-up welding groove, again overlay cladding carried out machining after the heat treatment.The shortcoming of this method is: during owing to built-up welding; Inevitably can produce shrinking stress during the molten metal cooling; If the stress that produces when overlay cladding shrinks surpasses the tensile strength of mother metal itself, defectives such as the cemented carbide of built-up welding very easily cracks, pore, slag inclusion.And the probability that when being used for F91, the built-up welding of F92 material, produces defective significantly increases; In addition, because there are certain fusion in overlay cladding and valve body mother metal during built-up welding, and other factors such as welding current, cause surfacing hardness not reach requirement.In case find after the machining that there is defective in sealing surface, just need car to remove overlay cladding, carry out built-up welding again, so just make that the size of built-up welding groove is increasing, the difficulty of built-up welding also just further strengthens, and design size originally also more cannot say for sure to demonstrate,prove.
When carrying out the sealing surface hard alloy overlay welding of the following valve body of inside nominal diameter DN32mm, as shown in Figure 2, because diameter is less; Can't adopt suitable profile cutter to process the built-up welding groove, therefore, after valve body blank 1 processes valve body mesopore 2; Direct whole built-up welding one deck cemented carbide 3 in valve body mesopore 2 bottoms, built-up welding goes out cemented carbide, and after heat treatment the overlay cladding of intermediate portion is removed in machining again; Cause the waste of cemented carbide, increase welding cost.
Summary of the invention
The technical problem that the present invention will solve provides a kind of valve sealing surface build-up welding method that is not prone to crackle and economical with materials.
For solving the problems of the technologies described above; Technological scheme of the present invention is: a kind of valve sealing surface build-up welding method; Its innovative point is that said method step is: at first on the valve body blank, process the valve body mesopore; Bore concentric technology aperture in valve body mesopore bottom then, the shaft shoulder face place between technology aperture and valve body mesopore carries out the built-up welding of cemented carbide.
The invention has the advantages that: bore valve seat orifice in valve body mesopore bottom, the annular shaft shoulder face between valve seat orifice and the valve body mesopore is carried out built-up welding, make the overlay cladding internal stress can access release, avoid the generation of crackle.And from the second layer, the inwall of overlay cladding does not just exist and mother metal fusion phenomenon, has guaranteed the quality of overlay cladding, and has saved the resurfacing welding material of valve seat orifice position.
Description of drawings
Fig. 1 is the valve seal surface build-up welding schematic representation of traditional inside nominal diameter DN32-65mm.
Fig. 2 is the valve seal surface build-up welding schematic representation below traditional inside nominal diameter DN32mm.
Fig. 3 is valve body sealing surface schematic representation among the present invention.
Fig. 4 is valve seal surface build-up welding schematic representation among the present invention.
Embodiment
Like Fig. 3, shown in 4, processing valve body mesopore 2 on valve body blank 1 at first, at the valve body mesopore 2 bottom drillers aperture 4 of planting, this technology aperture 4 is concentric with valve body mesopore 2.The size of technology aperture 4 guarantees enough machining allowance according to designing requirement, so that following process goes out valve seat orifice here.Shaft shoulder face place between technology aperture 4 and valve body mesopore 2 carries out the built-up welding of cemented carbide 3.
Claims (1)
1. valve sealing surface build-up welding method; It is characterized in that said method step is: at first on the valve body blank, process the valve body mesopore; Bore concentric technology aperture in valve body mesopore bottom then, the shaft shoulder face place between technology aperture and valve body mesopore carries out the built-up welding of cemented carbide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103805494A CN102494170A (en) | 2011-11-25 | 2011-11-25 | Surfacing method of sealing surface of valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103805494A CN102494170A (en) | 2011-11-25 | 2011-11-25 | Surfacing method of sealing surface of valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102494170A true CN102494170A (en) | 2012-06-13 |
Family
ID=46186017
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011103805494A Pending CN102494170A (en) | 2011-11-25 | 2011-11-25 | Surfacing method of sealing surface of valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102494170A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102785065A (en) * | 2012-08-31 | 2012-11-21 | 南通市电站阀门有限公司 | Process method of solving easily produced cracks in surfacing hard alloy on valve sealing surface |
| CN115008138A (en) * | 2022-06-28 | 2022-09-06 | 江苏华之益机械有限公司 | Surfacing machining process for valve component |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02296081A (en) * | 1989-05-09 | 1990-12-06 | Toshiba Corp | Manufacture of valve |
| CN1075671A (en) * | 1992-12-23 | 1993-09-01 | 中国华北电力联合公司北京电力设备总厂 | The laser melting and coating process of sealing surface of small calibre valve |
| US5826336A (en) * | 1994-08-23 | 1998-10-27 | Johnson Service Company | Process for the production of series-produced valves used in heating, ventilating and air-conditioning systems |
| CN102145423A (en) * | 2011-04-11 | 2011-08-10 | 大连大高阀门有限公司 | Argon arc welding surfacing process for cobalt-free material ERFeCr-A5 |
-
2011
- 2011-11-25 CN CN2011103805494A patent/CN102494170A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02296081A (en) * | 1989-05-09 | 1990-12-06 | Toshiba Corp | Manufacture of valve |
| CN1075671A (en) * | 1992-12-23 | 1993-09-01 | 中国华北电力联合公司北京电力设备总厂 | The laser melting and coating process of sealing surface of small calibre valve |
| US5826336A (en) * | 1994-08-23 | 1998-10-27 | Johnson Service Company | Process for the production of series-produced valves used in heating, ventilating and air-conditioning systems |
| CN102145423A (en) * | 2011-04-11 | 2011-08-10 | 大连大高阀门有限公司 | Argon arc welding surfacing process for cobalt-free material ERFeCr-A5 |
Non-Patent Citations (2)
| Title |
|---|
| 宁波: "波纹管截止阀阀体密封面堆焊的工艺研究", 《阀门》 * |
| 韩俊，肖箭，梁健: "锻钢截止阀阀体斜孔的加工", 《阀门》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102785065A (en) * | 2012-08-31 | 2012-11-21 | 南通市电站阀门有限公司 | Process method of solving easily produced cracks in surfacing hard alloy on valve sealing surface |
| CN102785065B (en) * | 2012-08-31 | 2015-01-14 | 南通市电站阀门有限公司 | Process method of solving easily produced cracks in surfacing hard alloy on valve sealing surface |
| CN115008138A (en) * | 2022-06-28 | 2022-09-06 | 江苏华之益机械有限公司 | Surfacing machining process for valve component |
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Application publication date: 20120613 |