CN115722927A - Valve sealing surface surfacing method and tool and product thereof - Google Patents
Valve sealing surface surfacing method and tool and product thereof Download PDFInfo
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- CN115722927A CN115722927A CN202211162232.8A CN202211162232A CN115722927A CN 115722927 A CN115722927 A CN 115722927A CN 202211162232 A CN202211162232 A CN 202211162232A CN 115722927 A CN115722927 A CN 115722927A
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Abstract
The invention discloses a valve sealing surface surfacing method, a tool and a product thereof, and relates to the technical field of valves, wherein the method comprises the following specific steps: s1, turning a valve sealing surface to form a surfacing groove, and fixing the valve on a rotary worktable; s2, preparing alloy powder, wherein the alloy powder comprises the following raw materials in percentage by mass: 13-16% of chromium, 0-0.2% of iron, 1-2% of manganese, 14-17% of molybdenum, 0-0.01% of phosphorus, 0-0.01% of sulfur, 0.3-0.8% of silicon, 3-5% of tungsten, 0.5-1% of vanadium and the balance of nickel; and S3, melting alloy powder by using laser to clad the surfacing groove while rotating the valve through the rotary worktable, and finally forming an alloy layer by surfacing. The surfacing welding method meets the surfacing welding requirement of the irregular valve sealing surface of the valve body, simultaneously improves the hardness of the surfacing welding layer and the combination effect of the surfacing welding layer and the valve sealing surface made of stainless steel, improves the wear resistance, corrosion resistance and scouring resistance of the surfacing welding layer, and finally improves the surfacing welding effect.
Description
Technical Field
The invention relates to the technical field of valves, in particular to a valve sealing surface surfacing method, a tool and a product thereof.
Background
The bottom of a container such as a tank container for storing corrosive liquid chemicals is often provided with a valve for discharging; however, even if the components of the valve are made of austenitic stainless steel with certain corrosion resistance, and the sealing surface between the valve body and the valve plate is made of spherical surface (such as a cage-type foot valve) to ensure the sealing performance, after the valve is used for a long time, the sealing surface of the valve cannot ensure the sealing performance any more after the sealing surface is subjected to multiple scouring corrosion by liquid chemicals, and finally the liquid chemicals leak outwards. The conventional sealing surface strengthening method is to weld the hard alloy on the sealing surface of the valve in a surfacing mode, and the cobalt-based alloy is generally selected, but the cobalt metal extraction difficulty of the cobalt-based alloy is high, the recovery rate is low, and the cost investment is increased.
At present, a cobalt-free alloy is used for surfacing, and Chinese patent publication No. CN106956094A discloses a hard surfacing alloy material, and the mass percentages of the components of the alloy material are as follows: nb: 1.0-2.5 Wt%, ni:0 to 2.0Wt%, C:0.3 to 0.5Wt%, si: 0.2-0.5 Wt%, mn: 1.0-1.5 Wt%, cr:3.0 to 4.0Wt%, mo: 1.5-2.0 Wt%, W + V + Ti: 2.0-2.5 Wt%, and the balance of Fe, and the method for welding the alloy material comprises the step of melting the alloy material on the surface of a steel plate by using a tungsten electrode argon arc heat source. Although the cobalt-free alloy is used for surfacing in the prior art, the improvement of the hardness, the wear resistance and the corrosion resistance after surfacing in the prior art is limited, and the mode of melting and coating the alloy material by using the argon tungsten-arc heat source is not suitable for a thin-wall sealing surface and still faces the problems of large deformation after welding and the like.
Chinese patent publication No. CN108326428A discloses a method for preparing a nuclear-grade valve surfacing material and a surfacing method, and proposes "preparing an alloy powder containing Fe- (3-5) wt.% Ni- (23-27) wt.% Cr- (1-2) wt.% C by using a gas atomization process, selecting an alloy powder having a particle size of 30 to 80 μm, and mixing the alloy powder with BC powder having a particle size of 1 to 5 μm, V powder having a particle size of 5 to 10 μm, ti powder having a particle size of 5 to 10 μm, and Mo powder having a particle size of 5 to 10 μm to obtain a final surfacing powder, wherein the contents of the BC powder, V powder, ti powder, and Mo powder are 0.7 to 1% of the weight of the alloy powder, and when mixing the five powders, the five powders are mixed by using ball milling, and the ball-milled mixed powder is surfaced on the surface of the valve by using a laser cladding method". According to the prior art, a nickel-based alloy is overlaid on a valve sealing surface in a laser cladding mode, and overlaying requirements of a thin-wall sealing surface can be met, but the hardness, the wear resistance and the corrosion resistance of an overlaying layer formed in the prior art are still general, the medium applicable to the valve is limited, the combination effect of the overlaying layer and the valve sealing surface is also general, and finally the overlaying effect is influenced.
For this reason, a new technical solution is needed to solve the above technical problems.
Disclosure of Invention
The invention aims to provide a surfacing method and a tool for a valve sealing surface and a product thereof, and aims to solve the technical problems that in the prior surfacing method for the valve sealing surface, which is provided by the background art, after a surfacing alloy material is surfacing-welded on the valve sealing surface in a laser cladding mode to form a surfacing layer, the hardness, wear resistance and corrosion resistance of the surfacing layer are still common, the medium applicable to the valve is limited, the combination effect of the surfacing layer and the valve sealing surface is common, and the surfacing effect is influenced finally, and meanwhile, the surfacing method cannot be ensured to be suitable for surfacing of the irregular valve sealing surface of a valve body.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the invention provides a valve sealing surface surfacing method, which comprises the following specific steps:
s1, turning a valve sealing surface to form a surfacing groove, and fixing the valve on a rotary worktable;
s2, preparing alloy powder, wherein the alloy powder is prepared from the following raw materials in percentage by mass: 13-16% of chromium, 0-0.2% of iron, 1-2% of manganese, 14-17% of molybdenum, 0-0.01% of phosphorus, 0-0.01% of sulfur, 0.3-0.8% of silicon, 3-5% of tungsten, 0.5-1% of vanadium and the balance of nickel, wherein the granularity of the raw materials is 53-150 meshes;
s3, melting alloy powder by using laser to clad the surfacing groove while rotating the valve through the rotary workbench, wherein the cladding speed is 1.8-2.2mm/S, and finally forming an alloy layer by surfacing; specifically, firstly, after the alloy powder prepared in the step S2 is filled in a powder bin, the alloy powder in the powder bin is sent into a nozzle of a laser cladding welding gun by using inert gas; then, rotating the valve through a rotary workbench, simultaneously operating the laser cladding welding gun to move through a joint robot, synchronously spraying alloy powder and laser beams from a nozzle, and dripping the alloy powder on a surfacing groove after the alloy powder is molten to be in a liquid state to form an alloy layer; and finally, machining the alloy layer to form a surfacing layer.
Further, the inert gas is compressed inert gas, the laser beam is 20-24KW, the thickness of the alloy layer is 1.8-2.2mm, and the thickness of the surfacing layer is 0.8-1.2mm.
In a second aspect, the invention provides a surfacing tool of the surfacing method for the sealing surface of the valve, which comprises a laser cladding welding gun, a powder bin, a joint robot and a rotary worktable for driving the valve to rotate, wherein the powder bin is connected with a nozzle of the laser cladding welding gun, the laser cladding welding gun is arranged at the end part of the joint robot, and the powder bin is also connected with an inert gas conveying pipe, wherein the diameter of the nozzle is 5.8-6.2mm.
In a third aspect, the invention also provides a valve, which is obtained by adopting the surfacing method for the sealing surface of the valve and the surfacing tool.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, firstly, a surfacing groove is formed by turning on a sealing surface of the valve, then, the valve is rotated by a rotary worktable, and meanwhile, laser is utilized to melt alloy powder to clad the surfacing groove, so that surfacing is completed, in the whole process, a welding path is realized by the rotation matching of the valve, so that the surfacing requirement of the irregular sealing surface of the valve is met, the adaptability of the surfacing method is greatly improved, and meanwhile, the alloy powder is composed of the following raw materials in percentage by mass: 13-16% of chromium, 0-0.2% of iron, 1-2% of manganese, 14-17% of molybdenum, 0-0.01% of phosphorus, 0-0.01% of sulfur, 0.3-0.8% of silicon, 3-5% of tungsten, 0.5-1% of vanadium and the balance of nickel, so that the alloy of the finally formed overlaying layer is a nickel-based alloy, the proportion of the element nickel in the alloy is more than half to form a stable austenite structure and dissolve more alloy elements, chromium, nickel and molybdenum are used as main elements of the alloy, and the synergistic effect of the element iron, manganese, phosphorus, sulfur, silicon, tungsten and vanadium and the elements of chromium, nickel and molybdenum is utilized to improve the hardness of the overlaying layer and the combination effect of the overlaying layer and a valve sealing surface made of a stainless steel material, improve the wear resistance, corrosion resistance and scouring resistance of the overlaying layer, effectively improve the overlaying effect and enable the valve after overlaying to greatly meet the sealing requirements of various media;
2. according to the invention, while the alloy powder is melted by laser to clad the surfacing groove, the uniformity of the components and the structure of the formed surfacing layer is effectively ensured by the operation mode of rotating the valve by the rotary worktable, so that the surfacing effect is improved;
3. the surfacing tool comprises a laser cladding welding gun, a powder bin, a joint robot and a rotary workbench, wherein the laser cladding welding gun is arranged at the end part of the joint robot, and the powder bin and a nozzle of the laser cladding welding gun are cooperatively arranged to be matched with the conventional control mechanism, so that the smooth realization of a welding path is ensured under the rotary operation state of the valve, and the surfacing applicability of the irregular valve sealing surface corresponding to the valve body and the uniformity of the tissue of a surfacing layer are further ensured;
4. the inert gas conveying pipe is arranged, so that the alloy powder in the powder bin is conveyed into a nozzle of a laser cladding welding gun, and meanwhile, the oxidation of the alloy powder is effectively avoided, and the surfacing effect is further ensured.
Drawings
FIG. 1 is a schematic diagram of the working principle of the present invention;
FIG. 2 is an enlarged view of a portion A of FIG. 1;
FIG. 3 is a valve with the tack-welding groove formed by the pin (the valve plate is omitted);
FIG. 4 is a schematic view of a valve sealing surface weld deposit state according to the present invention;
in the figure: 1. the device comprises a powder bin 2, an inert gas conveying pipe 3, a joint robot 4, a rotary workbench 5, a laser cladding welding gun 51, a nozzle 6 and a surfacing groove.
Detailed Description
The following examples are intended to further illustrate the invention and are not intended to limit the application of the invention.
Example 1
Surfacing of the sealing surface of the valve:
as shown in fig. 1-4, firstly, a build-up welding groove 6 is formed on the sealing surface of the valve (valve body), and then the valve is fixed on the rotary worktable 4 (the basic structures of the clamping mechanism, the rotating mechanism and the like on the existing rotary worktable are not specifically described herein, but the function implementation thereof should not be limited thereby);
then, first, a laser cladding welding gun 5 (the function and structure of the laser cladding welding gun are well known in the art, and the connection setting is also common knowledge and therefore not described herein, and not shown in detail in the drawings) is installed at the end of the articulated robot 3 (the basic structures of the control mechanism, the drive mechanism, and the like of a normal articulated robot are not specifically described herein, but the function implementation thereof should not be limited thereto), then the powder bin 1 is connected to the inert gas delivery pipe 2 and the nozzle 51 of the laser cladding welding gun 5 (the diameter is 5.8 to 6.2mm, and the basic structures of the powder nozzle, the laser nozzle, and the like of the nozzle of the normal laser cladding welding gun are not specifically described herein, but the function implementation thereof should not be limited thereto), and after the alloy powder is loaded in the powder bin 1, the alloy powder in the powder bin 1 is delivered to the nozzle 51 of the laser cladding welding gun 5 by using the inert gas delivery pipe 2;
then, rotating a valve through a rotating workbench 4, operating a laser cladding welding gun 5 to move through a joint robot 3, synchronously spraying alloy powder and 20-24KW laser beams from a nozzle 51 of the laser cladding welding gun 5, so that the alloy powder is molten to be liquid and then drops on a surfacing welding groove, and the liquid alloy powder is combined with the surface of the surfacing welding groove 6 at a high temperature to form an alloy layer with the thickness of 1.8-2.2mm (the speed is 1.8-2.2 mm/s);
and finally, machining the alloy layer to form a surfacing layer with the thickness of 0.8-1.2mm.
In addition, the raw material composition (by mass percent) used by the alloy powder is as follows: 14.5 percent of chromium powder, 0.1 percent of iron powder, 1.5 percent of manganese powder, 15.5 percent of molybdenum powder, 0.005 percent of phosphorus powder, 0.005 percent of sulfur powder, 0.55 percent of silicon powder, 4 percent of tungsten powder, 0.75 percent of vanadium powder and 63.09 percent of nickel powder, and the granularity of each raw material is 53-150 meshes.
Example 2
Surfacing of a valve sealing surface:
the alloy powder in the embodiment comprises the following raw materials (by mass percent): 13% of chromium powder, 1% of manganese powder, 14% of molybdenum powder, 0.3% of silicon powder, 3% of tungsten powder, 0.5% of vanadium powder and 68.2% of nickel powder.
The rest of the build-up welding method was the same as in example 1.
Example 3
Surfacing of a valve sealing surface:
the alloy powder in the embodiment comprises the following raw materials (by mass percent): 16% of chromium powder, 0.2% of iron powder, 2% of manganese powder, 17% of molybdenum powder, 0.01% of phosphorus powder, 0.01% of sulfur powder, 0.8% of silicon powder, 5% of tungsten powder, 1% of vanadium powder and 57.98% of nickel powder.
The rest of the build-up welding method was the same as in example 1.
The hardness of the weld overlays of the valves prepared in examples 1-3 was measured by a Rockwell hardness tester, and the measured hardness of the weld overlays was HRC 180-198.
Claims (9)
1. A valve sealing surface surfacing method is characterized by comprising the following specific steps:
s1, turning a valve sealing surface to form a surfacing groove, and fixing the valve on a rotary worktable;
s2, preparing alloy powder, wherein the alloy powder is prepared from the following raw materials in percentage by mass: 13-16% of chromium, 0-0.2% of iron, 1-2% of manganese, 14-17% of molybdenum, 0-0.01% of phosphorus, 0-0.01% of sulfur, 0.3-0.8% of silicon, 3-5% of tungsten, 0.5-1% of vanadium and the balance of nickel;
and S3, melting alloy powder by using laser to clad the surfacing groove while rotating the valve through the rotary worktable, and finally forming an alloy layer by surfacing.
2. The valve sealing surface overlaying method according to claim 1, wherein in said step S2, the particle sizes of the raw materials are all 53-150 mesh.
3. The valve sealing surface overlaying method according to claim 1, wherein in said step S3, the speed of cladding is 1.8-2.2mm/S.
4. The valve sealing surface overlaying method according to claim 1, wherein the specific operation flow of the step S3 is as follows:
firstly, after the alloy powder prepared in the step S2 is filled in a powder bin, the alloy powder in the powder bin is sent into a nozzle of a laser cladding welding gun by using inert gas; then, rotating the valve through a rotary workbench, simultaneously operating the laser cladding welding gun to move through a joint robot, synchronously spraying alloy powder and laser beams from a nozzle, and dripping the alloy powder on a surfacing groove after the alloy powder is molten to be in a liquid state to form an alloy layer; and finally, machining the alloy layer to form a surfacing layer.
5. The valve sealing face overlaying method according to claim 4, wherein said inert gas is a compressed inert gas and said laser beam is a 20-24KW laser beam.
6. A valve sealing face overlaying method according to claim 4, wherein said alloy layer has a thickness of 1.8-2.2mm and said overlaying layer has a thickness of 0.8-1.2mm.
7. The utility model provides a valve sealing face build-up welding frock, includes laser cladding welder and powder storehouse, the powder storehouse is connected with laser cladding welder's nozzle, its characterized in that still includes joint robot and is used for driving the rotatory rotary worktable of valve, laser cladding welder sets up the tip at joint robot, the powder storehouse still is connected with the inert gas conveyer pipe.
8. The valve sealing surface overlaying tool according to claim 7, wherein the diameter of said nozzle is 5.8-6.2mm.
9. A valve is characterized by being obtained by surfacing by using the surfacing method for the sealing surface of the valve and the surfacing tool according to any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211162232.8A CN115722927A (en) | 2022-09-23 | 2022-09-23 | Valve sealing surface surfacing method and tool and product thereof |
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| CN202211162232.8A CN115722927A (en) | 2022-09-23 | 2022-09-23 | Valve sealing surface surfacing method and tool and product thereof |
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| CN115722927A true CN115722927A (en) | 2023-03-03 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116329756A (en) * | 2023-05-23 | 2023-06-27 | 陕西华秦新能源科技有限责任公司 | 3D printing construction method of corrosion-resistant weld joint structure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116329756A (en) * | 2023-05-23 | 2023-06-27 | 陕西华秦新能源科技有限责任公司 | 3D printing construction method of corrosion-resistant weld joint structure |
| CN116329756B (en) * | 2023-05-23 | 2023-08-11 | 陕西华秦新能源科技有限责任公司 | 3D printing construction method of corrosion-resistant weld joint structure |
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