CN112553620B - Gas protection cover device for laser cladding coaxial powder feeding gun - Google Patents
Gas protection cover device for laser cladding coaxial powder feeding gun Download PDFInfo
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- CN112553620B CN112553620B CN202011441589.0A CN202011441589A CN112553620B CN 112553620 B CN112553620 B CN 112553620B CN 202011441589 A CN202011441589 A CN 202011441589A CN 112553620 B CN112553620 B CN 112553620B
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- porous copper
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- protection cover
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C24/00—Coating starting from inorganic powder
- C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
- C23C24/10—Coating starting from inorganic powder by application of heat or pressure and heat with intermediate formation of a liquid phase in the layer
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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Abstract
The invention discloses a gas protection cover device for a laser cladding coaxial powder feeding gun, which relates to the technical field of laser material processing and comprises a protection cover shell, a protection cover inner core and a porous copper strip, wherein the protection cover shell is sleeved on the outer side of the protection cover inner core, and the porous copper strip is arranged at the lower end of the protection cover shell; a first cavity chamber is formed by the inner side surface of the protective cover shell, the outer side surface of the protective cover inner core and the upper surface of the porous copper plate strip; one end of the first cavity chamber is communicated with the outer side face of the protective cover shell through a first through hole, and the other end of the first cavity chamber is communicated with the lower surface of the porous copper plate strip through the porous copper plate strip; the porous copper strip is configured to slow the flow rate of a gas stream penetrating the porous copper strip. By implementing the method, the solidified cladding layer can be protected from being oxidized, the airflow of the protective gas layer can be optimized, the oxygen brought by the gas turbulence is reduced, and the oxidation of the coating is avoided.
Description
Technical Field
The invention relates to the technical field of laser material processing, in particular to a gas protection cover device for a laser cladding coaxial powder feeding gun.
Background
The laser cladding is a surface modification technology, and is a technological method which is characterized in that an external material is added into a molten pool formed by a substrate after laser irradiation in a synchronous or material presetting mode, and the external material and the molten pool are solidified together to form a surface coating which has extremely low dilution and is metallurgically combined with the substrate material, so that the wear resistance, corrosion resistance, heat resistance, oxidation resistance, electrical appliance characteristics and the like of the surface of the substrate material are obviously improved; in order to avoid or reduce the oxidation of the coating in the laser cladding process, the main method is to blow inert gas into a laser molten pool so that the molten metal is separated from contact with oxygen in the air, thereby protecting the molten metal from oxidation.
In the prior art, the coaxial powder feeding gun device for laser cladding has the common characteristic that inert gas with air pressure is adopted to convey alloy powder through a conical powder feeding channel and then gather the alloy powder at a point in front of a nozzle, and the protective gas mostly adopts protective gas for conveying the alloy powder or outer protective gas surrounding the alloy powder to protect the alloy powder from being oxidized. Since a long period of time is required from solidification to cooling to 500 ℃ for laser cladding of an alloy layer, particularly an easily-oxidized coating material such as iron-based, titanium-based, aluminum-based and the like, and the cladding coating is oxidized in the long period of time, the coaxial powder feeding gun and the outer layer protective gas thereof described in the prior art can protect the alloy melt in a laser molten pool, but cannot ensure that the solidified cladding layer is not oxidized. In addition, the shielding gas delivery device in the prior art has large flow velocity of the shielding gas, and forms turbulence in the laser molten pool to cause air entrainment, so that an inert shielding gas layer containing oxygen is formed, and even if the flow rate of the shielding gas is increased, the problem of oxidation of the coating is still difficult to avoid.
Therefore, those skilled in the art are dedicated to develop a gas protection cover device for a laser cladding coaxial powder feeding gun, which not only can protect the solidified cladding layer from oxidation, but also can optimize the gas flow of the inert protection gas layer, reduce the oxygen brought by the gas turbulence, and avoid the oxidation of the coating layer.
Disclosure of Invention
In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is that the prior art cannot avoid the oxidation of the solidified cladding layer and the air entrainment during the formation of the inert shielding gas layer, which causes the oxidation of the coating layer.
In order to achieve the purpose, the invention provides a gas protection cover device for a laser cladding coaxial powder feeding gun, which comprises a protection cover shell, a protection cover inner core and a porous copper strip, wherein the protection cover shell is sleeved outside the protection cover inner core, the porous copper strip is arranged at the lower end of the protection cover shell, and a first through hole is formed in the protection cover shell;
a first cavity chamber is formed by the inner side surface of the protective cover shell, the outer side surface of the protective cover inner core and the upper surface of the porous copper plate strip; one end of the first cavity chamber is communicated with the outer side face of the protective cover shell through the first through hole, and the other end of the first cavity chamber is communicated with the lower surface of the porous copper plate strip through the porous copper plate strip; the porous copper strip is configured to slow the flow rate of a gas stream penetrating the porous copper strip.
Furthermore, a plurality of second through holes are formed in the porous copper strip and are communicated with the upper surface of the porous copper strip and the lower surface of the porous copper strip.
Further, a plurality of the second through holes are uniformly distributed on the porous copper lath.
Furthermore, the drift diameters of a plurality of second through holes are the same.
Furthermore, the cross section of the porous copper plate strip is T-shaped, and the central line of the porous copper plate strip is intersected with the central axis of the inner core of the protective cover.
Further, the protective cover shell further comprises a cooling hole and a third through hole, the cooling hole is formed in the protective cover shell, and the cooling hole is communicated with the outer side face of the protective cover shell through the third through hole.
Further, the cooling holes are arranged along the circumferential direction of the shield case.
Further, the number of third through holes is 2, two the third through holes set up in safety cover casing both sides.
Further, the safety cover inner core still includes the fourth through-hole, the central axis of fourth through-hole with the coincidence of the central axis of safety cover inner core, the fourth through-hole still includes first conical surface, first conical surface set up in fourth through-hole upper portion, first conical surface is configured to can with the laminating of the outer circular conical surface of coaxial powder feeding gun nozzle.
Further, the protective cover inner core further comprises a second conical surface, and the second conical surface is arranged on the lower portion of the outer side face of the protective cover inner core.
Further, the device also comprises a first pipe joint and a second pipe joint, wherein the first pipe joint is in threaded sealing connection with the first through hole, and the second pipe joint is in threaded sealing connection with the third through hole.
The thread sealing connection in the invention means that the connection is tight and mutually sealed in a thread mode.
Compared with the prior art, the implementation of the invention has at least the following beneficial technical effects:
(1) according to the technical scheme disclosed by the invention, a gentle and stable protective gas layer can be formed on the surface of the cladding coating, so that the cladding coating can be effectively protected, the oxidation of the cladding layer can be effectively avoided, and the oxidation of the solidified coating can also be avoided.
(2) The technical scheme disclosed by the invention can realize large-area and high-quality laser cladding of the titanium, aluminum and magnesium alloy which is easy to oxidize.
(3) The technical scheme disclosed by the invention has the advantages of simple structure, convenience in assembly and disassembly and easiness in popularization.
The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, the features and the effects of the present invention.
Drawings
FIG. 1 is a schematic structural view of a gas shield apparatus for a laser cladding coaxial powder feeding gun according to a preferred embodiment of the present invention;
FIG. 2 is a schematic view of the embodiment of FIG. 1 in view A;
FIG. 3 is a schematic left side view of the embodiment of FIG. 1;
FIG. 4 is a schematic diagram of a laser cladding process of a coaxial powder feeding gun used in the prior art;
FIG. 5 is a graph of the results of laser cladding TC4 titanium alloy using the apparatus shown in FIG. 4;
FIG. 6 is a schematic view of the embodiment of FIG. 1 mounted on a coaxial powder delivery gun;
fig. 7 is a graph of the results of laser cladding TC4 titanium alloy using the apparatus shown in fig. 6.
The method comprises the following steps of 1-laser beam, 2-coaxial powder feeding gun for laser cladding, 3-coaxial powder feeding gun nozzle external conical surface, 4-laser cladding powder, 5-laser cladding coating, 6-gas protective cover device, 61-protective cover shell, 62-protective cover inner core, 63-first pipe joint, 64-second pipe joint, 65-cooling hole, 66-porous copper strip, 67-first cavity chamber, 7-inert protective gas, 8-laser cladding substrate, 91-laser cladding direction, 92-laser melting pool, 93-coating high temperature section and 94-coating low temperature section.
Detailed Description
The technical contents of the preferred embodiments of the present invention will be more clearly and easily understood by referring to the drawings attached to the specification. The present invention may be embodied in many different forms of embodiments and the scope of the invention is not limited to the embodiments set forth herein.
In the drawings, structurally identical elements are represented by like reference numerals, and structurally or functionally similar elements are represented by like reference numerals throughout the several views. The size and thickness of each component shown in the drawings are arbitrarily illustrated, and the present invention is not limited to the size and thickness of each component. The thickness of the components may be exaggerated where appropriate in the figures to improve clarity.
In the description of the embodiments of the present application, it should be clear that the terms "center", "upper", "lower", "left", "right", "inner", "outer", "top", "bottom", "side", "vertical", "horizontal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the embodiments of the present application and for simplifying the description, but do not indicate or imply that the described devices or elements must have specific orientations or positional relationships, i.e., cannot be construed as limitations on the embodiments of the present application; furthermore, the terms "first," "second," "third," "fourth," and the like are used merely to facilitate description or to simplify description, and do not indicate or imply importance.
As shown in fig. 1, the present embodiment provides a gas protection cover device 6 for a laser cladding coaxial powder feeding gun, which includes a protection cover housing 61, a protection cover inner core 62, a porous copper plate strip 66, a first pipe joint 63, and a second pipe joint 64, where the protection cover housing 61 is sleeved on the outer side of the protection cover inner core 62, the porous copper plate strip 66 is disposed at the lower end of the protection cover housing 61, the protection cover housing 61 is provided with a first through hole, and in the present embodiment, it is preferable that two sides of the protection cover housing 61 are respectively provided with a first through hole; a first cavity chamber 67 is formed by the inner side surface of the protective cover shell 61, the outer side surface of the protective cover inner core 62 and the upper surface of the porous copper plate strip 66; the upper end of the first cavity chamber 67 is communicated with the outer side surface of the protective cover shell 61 through a first through hole, one end of a first pipe joint 63 is in threaded sealing connection with the first through hole, and the other end of the first pipe joint 63 is connected with a hose; the lower end of the first cavity chamber 67 is communicated with the lower surface of the porous copper plate strip 66 through the porous copper plate strip 66; the porous copper plate strip 66 is configured to slow down the flow rate of the air flow penetrating the porous copper plate strip 66, and the first hollow chamber 67 is preferably in communication with the outside only through the first through hole and the porous copper plate strip 66.
In this embodiment, the protective gas is introduced through the hose connected to the first through hole, the protective gas enters the first hollow chamber 67 through the first through hole, and gradually passes through the first hollow chamber 67, after the protective gas enters the first hollow chamber 67, the speed becomes gentle, and as the pressure of the protective gas in the first hollow chamber 67 gradually increases, the protective gas in the first hollow chamber 67 gradually permeates out of the first hollow chamber 67 through the porous copper strip 66, and the shape and the setting range of the porous copper strip can be reasonably set according to the shape of the laser cladding working area, so that a gentle and stable protective gas layer is formed on the surface of the laser cladding coating 5; in this embodiment, the shielding gas is an inert gas, preferably argon.
In this embodiment, the porous copper plate strip 66 is provided with a plurality of second through holes, the second through holes communicate the upper surface of the porous copper plate strip 66 with the lower surface of the porous copper plate strip 66, and the plurality of second through holes are uniformly distributed on the porous copper plate strip 66.
In one embodiment of the invention, the diameters of the second through holes are the same, and the cross-sectional shapes of the second through holes are circular, polygonal, oval or oblong holes.
In the embodiment, the cross section of the porous copper plate strip 66 is in a T shape, a T-shaped groove is formed at the lower end of the protective cover shell 61, and the porous copper plate strip 66 is fixedly arranged in the T-shaped groove at the lower end of the protective cover shell 61; the center line of the porous copper strip 66 intersects the center axis of the shield core 62 as shown in fig. 2.
The protective cover shell 61 further comprises a cooling hole 65 and a third through hole, the cooling hole 65 is arranged inside the protective cover shell 61, the number of the third through holes is 2, the two third through holes are arranged on two sides of the protective cover shell 61, the cooling hole 65 is communicated with the outer side face of the protective cover shell 61 through the third through hole, and the cooling hole 65 is circumferentially arranged along the protective cover shell 61.
As shown in fig. 2, the cooling hole 65 is a circular hole for cooling the protective cover casing 61, one end of the second pipe joint 64 is connected with the third through hole in a threaded sealing manner, and the other end of the second pipe joint 64 is connected with the cooling hose; as shown in fig. 3, the second pipe joint 64 is disposed directly below the first pipe joint 63, and the porous copper strip 66 is disposed below the second pipe joint 64.
In this embodiment, a cooling medium is introduced through a hose connected to the third through hole, the cooling medium enters the cooling hole 65 through the third through hole on one side, the cooling medium in the cooling hole 65 flows out through the third through hole on the other side, and flows through the inside of the protective cover shell 61 through the cooling medium, so as to cool the protective cover shell 61 or adjust the temperature of the protective cover shell 61, thereby achieving heat dissipation of the protective cover shell 61 and the porous copper plate strips 66, and enabling the gas protective cover device 6 to work for a long time; the cooling medium in this embodiment is preferably water, more preferably soft water. In the embodiment, the soft water refers to water containing no or less soluble calcium and magnesium compounds, and the content of calcium salt and magnesium salt in the soft water is 1.0-50 mg/L.
As shown in fig. 1, the protecting cover inner core 62 further includes a fourth through hole, a central axis of the fourth through hole coincides with a central axis of the protecting cover inner core 62, the fourth through hole further includes a first conical surface, the first conical surface is arranged at the upper portion of the fourth through hole, and the first conical surface is configured to be capable of being attached to the outer conical surface 3 of the nozzle of the coaxial powder feeding gun; the protective cover inner core 62 further comprises a second conical surface, the second conical surface is arranged on the lower portion of the outer side face of the protective cover inner core 62, and the first cavity chamber 67 is close to the central axis of the fourth through hole as far as possible by the second conical surface.
As shown in fig. 4, a laser beam 1 passes through a coaxial powder feeding gun 2 for laser cladding, melts laser cladding powder 4, and forms a laser cladding coating 5 on a laser cladding substrate 8; wherein, the laser cladding coating 5 has 3 sections of temperature which are respectively a laser melting pool 92, a coating high temperature section 93 and a coating low temperature section 94, the temperature of the laser melting pool 92 is more than or equal to 1500 ℃, the temperature of the coating high temperature section 93 is 500 ℃ to 1500 ℃, and the temperature of the coating low temperature section 94 is room temperature to 500 ℃; as shown in fig. 5, the TC4 titanium alloy is actually laser-clad, the gas shield device 6 is not installed in the coaxial powder feeding gun 2 for laser cladding, the TC4 titanium alloy coating high-temperature section 93 cannot be effectively protected by the shield gas and is oxidized, and the coating of the coating high-temperature section 93 presents a blue oxidation color.
As shown in fig. 6, the gas shield apparatus 6 is attached to the coaxial powder feeding gun 2 for laser cladding, and the first conical surface of the shield core 62 is bonded to the outer conical surface 3 of the nozzle of the coaxial powder feeding gun. A laser beam 1 passes through a coaxial powder feeding gun 2 for laser cladding, laser cladding powder 4 is melted, and a laser cladding coating 5 is formed on a laser cladding substrate 8; inert shielding gas argon is introduced through the first pipe joint 63, the argon enters the first cavity chamber 67 through the shielding gas channel, and continuously penetrates through the porous copper strip 66 after the first cavity chamber 67 is calmed, and inert shielding gas 7 of gentle and stable argon is formed on the surface of the laser cladding coating 5, so that the laser cladding coating 5 can be effectively protected, and the solidified coating high-temperature section 93 is prevented from being oxidized. As shown in fig. 7, the TC4 titanium alloy is actually laser-clad, the gas shield device 6 is installed in the coaxial powder feeding gun 2 for laser cladding, the TC4 titanium alloy coating high-temperature section 93 is effectively protected by the shielding gas, and the coating of the coating high-temperature section 93 presents silvery white.
By adopting the coaxial powder feeding gun 2 for laser cladding of the gas protection cover device 6 disclosed by the embodiment, a uniform laser cladding layer can be obtained on the metal surface after laser irradiation, the laser cladding efficiency is greatly improved, the defects of oxidation and the like of the cladding layer are less, and the coaxial powder feeding gun is suitable for large-area laser cladding treatment of titanium, aluminum, magnesium-based and other easily oxidized alloys. The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (5)
1. A gas protection cover device for a laser cladding coaxial powder feeding gun is characterized by comprising a protection cover shell, a protection cover inner core and a porous copper strip, wherein the protection cover shell is sleeved on the outer side of the protection cover inner core, the porous copper strip is arranged at the lower end of the protection cover shell, and a first through hole is formed in the protection cover shell;
a first cavity chamber is formed by the inner side surface of the protective cover shell, the outer side surface of the protective cover inner core and the upper surface of the porous copper plate strip; one end of the first cavity chamber is communicated with the outer side face of the protective cover shell through the first through hole, and the other end of the first cavity chamber is communicated with the lower surface of the porous copper plate strip through the porous copper plate strip; the porous copper strip is configured to slow the flow rate of a gas stream penetrating the porous copper strip;
a plurality of second through holes are formed in the porous copper strip and are communicated with the upper surface of the porous copper strip and the lower surface of the porous copper strip;
the second through holes are uniformly distributed on the porous copper lath;
the protective cover shell further comprises a cooling hole and a third through hole, the cooling hole is arranged in the protective cover shell, and the cooling hole is communicated with the outer side face of the protective cover shell through the third through hole;
the protective cover inner core further comprises a fourth through hole, the central axis of the fourth through hole is overlapped with the central axis of the protective cover inner core, the fourth through hole further comprises a first conical surface, the first conical surface is arranged at the upper part of the fourth through hole, and the first conical surface is configured to be capable of being attached to an outer conical surface of a nozzle of a coaxial powder feeding gun;
the protective cover inner core further comprises a second conical surface, and the second conical surface is arranged on the lower portion of the outer side face of the protective cover inner core.
2. The gas shield apparatus of claim 1 wherein said porous copper plate strip is T-shaped in cross-sectional shape with a centerline of said porous copper plate strip intersecting a central axis of said shield core.
3. The gas shield apparatus of claim 1 wherein said cooling holes are circumferentially disposed along said shield shell.
4. The gas shield apparatus of claim 1 wherein said number of third through holes is 2, two of said third through holes being disposed on either side of said shield case.
5. The gas shield apparatus of claim 1, further comprising a first nipple threadably sealingly connected to said first throughbore, a second nipple threadably connected sealingly to said third throughbore.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011441589.0A CN112553620B (en) | 2020-12-08 | 2020-12-08 | Gas protection cover device for laser cladding coaxial powder feeding gun |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011441589.0A CN112553620B (en) | 2020-12-08 | 2020-12-08 | Gas protection cover device for laser cladding coaxial powder feeding gun |
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| CN112553620A CN112553620A (en) | 2021-03-26 |
| CN112553620B true CN112553620B (en) | 2022-05-17 |
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| CN114836749A (en) * | 2022-04-26 | 2022-08-02 | 安徽中科春谷激光产业技术研究院有限公司 | Laser cladding powder feeding gas protection device |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1112276C (en) * | 2000-01-07 | 2003-06-25 | 清华大学 | Split-type coaxial powder-feeding nozzle for laser fusion and coating |
| CN2510502Y (en) * | 2001-10-18 | 2002-09-11 | 北京有色金属研究总院 | Laser coating coaxial powder-delivery nozzle |
| US20050056628A1 (en) * | 2003-09-16 | 2005-03-17 | Yiping Hu | Coaxial nozzle design for laser cladding/welding process |
| CN201823642U (en) * | 2010-08-17 | 2011-05-11 | 华东理工大学 | Laser cladding coaxial powder delivery nozzle comprising guide protective air flow |
| CN104109858B (en) * | 2014-07-23 | 2016-08-24 | 中国人民解放军第五七一九工厂 | The profiling restorative procedure of compressor rotor blade blade tip abrasion |
| CN105821408B (en) * | 2016-05-03 | 2018-06-05 | 中国航空工业集团公司北京航空材料研究院 | The process of TC4-DT titanium alloys is repaired using laser melting coating |
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