CN110952088A - Coaxial powder feeding device - Google Patents
Coaxial powder feeding device Download PDFInfo
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- CN110952088A CN110952088A CN201911329582.7A CN201911329582A CN110952088A CN 110952088 A CN110952088 A CN 110952088A CN 201911329582 A CN201911329582 A CN 201911329582A CN 110952088 A CN110952088 A CN 110952088A
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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
- C23C24/103—Coating with metallic material, i.e. metals or metal alloys, optionally comprising hard particles, e.g. oxides, carbides or nitrides
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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
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
- C23C4/123—Spraying molten metal
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Abstract
The invention discloses a coaxial powder feeding device, belonging to the technical field of laser additive manufacturing, wherein a laser beam cavity with an inverted cone structure is arranged on a device body, the powder feeding cavities are symmetrically distributed on two sides of the laser beam cavity and are in cylindrical structures, the convergence points of the section center lines of the powder feeding cavities and the section center line of the laser beam cavity are in the same plane, because the powder cake formed by the powder feeding cavity outlet has a certain diameter, the powder cake can be converged with the laser beam above the laser beam convergence point, so that most of the energy of the laser beam is used for heating, melting and accelerating the powder particles in flight, only a very small amount of the energy of the laser beam can heat the matrix, thereby avoiding the matrix from being overheated to greatly reduce the dilution rate, reducing the deformation and the dilution rate of the matrix, the powder utilization rate and the processing efficiency can be greatly improved, and the effective components of the coating are not influenced by the matrix material, so that the corrosion-resistant and wear-resistant effects of the coating are improved.
Description
Technical Field
The invention relates to the technical field of laser additive manufacturing, laser cladding and laser thermal spraying, in particular to a coaxial powder feeding device.
Background
Most of core key parts of modern high-end equipment are moving parts, and frequent damage and even failure of the core key parts are caused by abrasion, corrosion, fatigue and the like, so that the long-term reliable operation of equipment is threatened, and a large amount of expensive core key parts are scrapped, thereby causing huge economic loss, resource waste and energy waste.
On one hand, the traditional wear-resistant corrosion-resistant nickel-based alloy coating preparation equipment has the problems of poor powder particle melting in the coating preparation process due to the characteristics of large size, high hardness, high melting point and the like of the used nickel-based powder, so that the prepared coating has the defects of easiness in cracking, low density and the like and cannot meet the production requirement.
On the other hand, the traditional coating processing equipment has the problems of low heat input control accuracy, low processing efficiency, serious pollution and the like, so that the matrix is heated too much and deforms seriously, and the prepared nickel-based alloy coating has poor corrosion resistance and abrasion resistance due to serious cracking. Therefore, a new process for preparing a nickel-based material coating is needed to meet the actual production requirement and solve the problem that the nickel-based alloy coating cracks in the preparation process to a great extent so as to cause the deterioration of wear resistance and corrosion resistance.
However, the laser spraying equipment commonly used in the market at present is actually light external powder of powder-coated laser regardless of coaxial powder feeding or paraxial powder feeding. The problems of short action time of laser and powder caused by external powder feeding by light, low processing precision of a powder feeding nozzle, low utilization rate of powder and the like
Disclosure of Invention
The invention provides a coaxial powder feeding device, which realizes the convergence of powder at the central point of a light spot by optimizing the included angle between a powder feeding cavity and a light beam cavity, so that most of the energy of a laser beam is used for heating, melting and accelerating powder particles in flight, the phenomenon that a matrix is excessively heated to greatly reduce the dilution rate is avoided, the deformation and the dilution rate of the matrix are reduced, the powder utilization rate and the processing efficiency can be greatly improved, and the effective components of a coating are not influenced by the matrix material, so that the corrosion-resistant and wear-resistant effects of the coating are improved.
The specific technical scheme provided by the invention is as follows:
the invention provides a coaxial powder feeding device which comprises a device body and a connecting device fixed on the device body, wherein the connecting device is used for fixing the coaxial powder feeding device with other components, a laser beam cavity with an inverted conical structure and powder feeding cavities with cylindrical structures distributed on two sides of the laser beam cavity are arranged on the device body, and the convergence point of the section center line of the powder feeding cavity and the section center line of the laser beam cavity is in the same plane.
Optionally, the powder feeding cavity comprises a left powder feeding cavity and a right powder feeding cavity which are formed by a plurality of cylindrical powder feeding pipes, wherein the cylindrical powder feeding pipes of the left powder feeding cavity and the right powder feeding cavity are alternately and complementarily arranged relatively.
Optionally, the device body includes a device central body, and a left body and a right body symmetrically disposed on two sides of the device central body, wherein the left powder feeding cavity is disposed along a splicing surface between the left body and the device central body, and the right powder feeding cavity is disposed along a splicing surface between the right body and the device central body.
Optionally, the cylindrical powder feeding pipe is of a split structure, and comprises a left pipe body and a right pipe body which are matched with each other in a splicing manner, wherein the left pipe body of the cylindrical powder feeding pipe in the left powder feeding cavity is located on the side face, opposite to the central body, of the left body, and the right pipe body of the cylindrical powder feeding pipe in the right powder feeding cavity is located on the side face, opposite to the central body, of the right body.
Optionally, the number of the cylindrical powder feeding pipes in the left powder feeding cavity is 1 less or 1 more than that of the cylindrical powder feeding pipes in the right powder feeding cavity, and all converging points between the central axis of the cylindrical powder feeding pipes and the central axis of the laser beam cavity are on the same straight line.
Optionally, the laser beam cavity is of an inverted trapezoidal rectangular pyramid structure, the taper of the laser beam cavity is 1: 10-1: 5, and the cylindrical powder feeding pipe comprises a cylindrical narrow pipe, a cylindrical connecting pipe and a tapered transition pipe for connecting the cylindrical narrow pipe and the cylindrical connecting pipe.
Optionally, the left cooling cavity is arranged on the outer side of the left powder feeding cavity, the right cooling cavity is arranged on the outer side of the right powder feeding cavity, and the left cooling cavity and the right cooling cavity are symmetrically distributed on two sides of the laser beam cavity.
Optionally, the connecting device is arranged on the side surface of the device body, a dovetail groove is arranged on the connecting device, and a thread counter bore is arranged at the bottom of the dovetail groove.
Optionally, the connecting device is arranged at the upper end of the device body, a connecting flange is arranged on the connecting device, the connecting flange is used for being fixed with other components, and the laser beam cavity penetrates through the device body and the connecting device.
Optionally, the left cooling chamber and the right cooling chamber are rectangular inner chambers which are obliquely arranged, cooling liquid circulating pipe mounting holes are formed in the side walls of the rectangular inner chambers, and an included angle between the left cooling chamber and the right cooling chamber is 30-45 degrees.
The invention has the following beneficial effects:
the embodiment of the invention provides a coaxial powder feeding device which comprises a device body and a connecting device fixed on the device body, wherein a laser beam cavity with an inverted conical structure and powder feeding cavities with cylindrical structures distributed on two sides of the laser beam cavity are arranged on the device body, the convergence point of the section center line of the powder feeding cavity and the section center line of the laser beam cavity is in the same plane, namely the convergence point of the laser beam and the convergence point of the powder feeding cavity are distributed in the same horizontal plane, and a powder cake formed by the powder feeding cavity outlet has a certain diameter and can be converged with the laser beam above the convergence point of the laser beam, so that most of the energy of the laser beam is used for heating, melting and accelerating the flying powder particles, only a very small amount of beam energy can heat the substrate, and the phenomenon that the substrate is excessively heated to greatly reduce the dilution rate is avoided, the deformation and dilution rate of the matrix are reduced, the powder utilization rate and the processing efficiency can be greatly improved, and the effective components of the coating are not influenced by the matrix material, so that the corrosion-resistant and wear-resistant effects of the coating are improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is an isometric schematic view of a coaxial powder feeder according to an embodiment of the invention;
fig. 2 is another isometric view of a coaxial powder feeder according to an embodiment of the invention;
FIG. 3 is a schematic top view of a coaxial powder feeding device according to an embodiment of the present invention;
fig. 4 is a schematic rear view of a coaxial powder feeding device according to an embodiment of the present invention;
FIG. 5 is a schematic front view of a coaxial powder feeding device according to an embodiment of the present invention;
FIG. 6 is a schematic sectional view taken along line A-A in FIG. 3 according to an embodiment of the present invention;
FIG. 7 is a schematic cross-sectional view taken along line B-B in FIG. 3 according to an embodiment of the present invention;
FIG. 8 is a schematic cross-sectional view taken along line C-C of FIG. 4 in accordance with an embodiment of the present invention;
FIG. 9 is a schematic cross-sectional view taken along line D-D of FIG. 4 in accordance with an embodiment of the present invention;
FIG. 10 is a schematic cross-sectional view taken along line E-E of FIG. 5 in accordance with an embodiment of the present invention;
FIG. 11 is an isometric view of another coaxial powder feeder according to an embodiment of the invention;
FIG. 12 is a schematic front view of another coaxial powder feeding device according to an embodiment of the present invention;
FIG. 13 is a schematic side view of another coaxial powder feeding device according to an embodiment of the present invention;
FIG. 14 is a schematic bottom view of another coaxial powder feeding device according to an embodiment of the present invention;
FIG. 15 is a schematic top view of another coaxial powder feeding apparatus according to an embodiment of the present invention;
FIG. 16 is a schematic cross-sectional view of another coaxial powder feeding device according to the embodiment of the present invention;
FIG. 17 is a schematic cross-sectional view taken along line G-G of FIG. 15 in accordance with an embodiment of the present invention;
FIG. 18 is a schematic cross-sectional view taken along line H-H in FIG. 15 according to an embodiment of the present invention;
fig. 19 is a schematic front view of a device body according to an embodiment of the present invention;
FIG. 20 is a schematic top view of a device body according to an embodiment of the present invention;
FIG. 21 is a schematic cross-sectional view taken along line I-I of FIG. 19 according to an embodiment of the present invention;
FIG. 22 is a schematic cross-sectional view taken along the line J-J in FIG. 20, according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A coaxial powder feeding apparatus according to an embodiment of the present invention will be described in detail with reference to fig. 1 to 22.
Example one
Referring to fig. 1, 2 and 3, a coaxial powder feeding device according to an embodiment of the present invention includes a device body 1 and a connecting device 2 fixed to the device body 1, where the connecting device 2 is used to fix the coaxial powder feeding device according to the embodiment of the present invention to other components, and for example, the device body 1 of the coaxial powder feeding device according to the embodiment of the present invention is fixed to a laser cladding device or a laser spray melting apparatus through the connecting device 2.
Referring to fig. 1, 6 and 7, the device body 1 is provided with a laser beam cavity 3 having an inverted conical structure and powder feeding cavities 4 having a cylindrical structure and distributed on both sides of the laser beam cavity 3, and as shown in fig. 6, the convergence points of the cross-sectional center lines of the powder feeding cavity 4 and the cross-sectional center line of the laser beam cavity 3 are in the same plane. Referring to fig. 6 and 7, each powder feeding chamber 4 is composed of a plurality of powder feeding tubes, wherein each powder feeding tube is arranged obliquely in the vertical direction, the laser beam chamber is arranged vertically in the vertical direction, and the central axis of each powder feeding tube intersects with the central axis of the laser beam chamber, and the intersection points between the central axes of all the powder feeding tubes and the central axis of the laser beam chamber are all in the same horizontal plane, i.e. the intersection points between the central axes of all the powder feeding tubes and the central axis of the laser beam chamber form a cake-shaped structure in the same horizontal plane, so that cake coatings can be formed at the convergence points of the beams in the laser beam chamber, and the cake formed at the outlet of the powder feeding chamber has a certain diameter and can be converged with the laser beam above the convergence point of the laser beam, so that the laser beam contacts with the cake before reaching the surface of the substrate, the laser beam can be used for heating, melting and accelerating the flying powder particles, only a very small amount of light beam energy can heat the matrix, the dilution rate is prevented from being greatly reduced due to overheating of the matrix, the matrix deformation and dilution rate are reduced, the powder utilization rate and processing efficiency can be greatly improved, and the effective components of the coating are not influenced by the matrix material, so that the corrosion-resistant and wear-resistant effects of the coating are improved.
For example, referring to fig. 6, the cross section of the device body 1 is a fan-shaped structure, wherein a cross-sectional centerline of the powder feeding cavity 4 (i.e. a central axis of each powder feeding tube) and a cross-sectional centerline of the laser beam cavity 3 (i.e. an intersection line between a central axis surface in the width direction of the laser beam cavity and a central axis surface in the width direction of the laser beam cavity) are respectively overlapped with different radius lines of a circle where the fan-shaped structure is located, that is, the powder feeding cavity 4 and the laser beam cavity 3 are both arranged along the radius direction of the circle where the fan-shaped structure is located, so that no matter how the number of the powder feeding tubes distributed in the width direction of the laser beam cavity 3 in the powder feeding cavity 4 and the width of the laser beam cavity 3 are changed, it can be ensured that a converging point of the laser beam and a converging point of the powder feeding cavity are distributed in the same plane, but a powder cake formed at an outlet of the powder feeding cavity has a certain diameter and, the laser beam is contacted with the powder cake before reaching the surface of the matrix, so that most of the energy of the laser beam is used for heating, melting and accelerating the powder particles in flight, only a very small amount of the energy of the laser beam can heat the matrix, the phenomenon that the dilution rate is greatly reduced because the matrix is overheated is avoided, the deformation and the dilution rate of the matrix are reduced, the powder utilization rate and the processing efficiency can be greatly improved, and the effective components of the coating are not influenced by the matrix material, so that the corrosion-resistant and wear-resistant effects of the coating are improved.
Referring to fig. 1, 2, 3, 8 and 9, the powder feeding chamber 4 includes a left powder feeding chamber 402 and a right powder feeding chamber 403 composed of a plurality of cylindrical powder feeding pipes 401, wherein the cylindrical powder feeding pipes 401 of the left powder feeding chamber 402 and the right powder feeding chamber 403 are alternately and complementarily arranged with respect to each other. The main body of the cylindrical powder feeding pipe 401 may be a cylindrical powder feeding pipe or a prismatic powder feeding pipe, for example, the cylindrical powder feeding pipe 401 may have a triangular prism or a quadrangular prism structure, which is not limited in the embodiment of the present invention, however, the cross-sectional shape of the main body of the cylindrical powder feeding pipe 401 is the same, that is, the diameter of the cylindrical powder feeding pipe 401 in the length direction thereof needs to be ensured to be uniformly distributed, so as to ensure uniform circulation of the powder in the powder feeding pipe.
Referring to fig. 8 and 9, the cylindrical powder feeding pipes 401 of the left powder feeding cavity 402 and the right powder feeding cavity 403 are arranged in a staggered manner, that is, the projections of the center of the cylindrical powder feeding pipe 401 of the left powder feeding cavity 402 and the center of the cylindrical powder feeding pipe 401 of the right powder feeding cavity 403 in the length direction of the laser beam cavity 3 do not coincide with each other, and the projections of the center of the cylindrical powder feeding pipe 401 of the left powder feeding cavity 402 and the center of the cylindrical powder feeding pipe 401 of the right powder feeding cavity 403 in the length direction of the laser beam cavity 3 are distributed in a staggered and complementary manner, so that a powder cake gap can be prevented from being formed around the laser beam, and the projections of the center of the cylindrical powder feeding pipe 401 of the left powder feeding cavity 402 and the center of the cylindrical powder feeding pipe 401 of the right powder feeding cavity 403 in the length direction of the laser beam cavity 3 are distributed at symmetrical intervals, so that the uniformity of the powder cake formed around the.
Specifically, referring to fig. 10, 11 and 12, the number of the cylindrical powder feeding pipes 401 of the left powder feeding cavity 402 is 1 less or 1 more than the number of the cylindrical powder feeding pipes 401 of the right powder feeding cavity 403, that is, the number of the cylindrical powder feeding pipes 401 included in the left powder feeding cavity 402 and the right powder feeding cavity 403 is different, and the projection of the center of the cylindrical powder feeding pipe 401 of the left powder feeding cavity 402 and the projection of the center of the cylindrical powder feeding pipe 401 of the right powder feeding cavity 403 in the length direction of the laser beam cavity 3 are in staggered complementary distribution, so that the number of the cylindrical powder feeding pipes 401 of the left powder feeding cavity 402 is 1 less or 1 more than the number of the cylindrical powder feeding pipes 401 of the right powder feeding cavity 403, which can ensure the uniformity and integrity of the powder cake formed around the laser beam, and avoid the occurrence of blank gaps.
Referring to fig. 1, 2, 3, 8, 9 and 10, the powder feeding chamber 4 and the laser beam chamber 3 are both arranged in parallel in the thickness direction of the apparatus body 1, and the laser beam chamber 3 is vertically arranged in the middle of the apparatus body 1. That is, the coaxial powder feeding device of the embodiment of the invention adopts the optical internal powder feeding principle of designing the diameter of the powder cake according to the diameter of the light spot, increases the acting time between the laser beam and the powder cake in a mode of matching the diameter of the light spot with the diameter of the powder cake, and improves the utilization rate of the powder and the metallurgical bonding strength of the coating.
Referring to fig. 1, 2, 3, 8, 9 and 10, a laser beam cavity 3 according to an embodiment of the present invention is an inverted trapezoidal rectangular pyramid structure, and a powder feeding cavity 4 is a left powder feeding cavity and a right powder feeding cavity formed by two rows of cylindrical powder feeding tubes distributed in parallel along a long side of the laser beam cavity 3, that is, a rectangular light spot is adopted in the embodiment of the present invention to match with a circular powder cake, so as to further increase an acting time between the laser beam and the powder cake, and improve a utilization rate of powder and a metallurgical bonding strength of a coating. The taper of the laser beam cavity is 1: 10-1: 5, preferably 15:114, wherein the taper refers to the ratio of the difference value of the radius of the large end and the radius of the small end to the height. Under the taper, the action time between the laser beam and the powder cake is longest, the utilization rate of the powder is highest, the dilution rate of the matrix is lowest, and the metallurgical bonding strength of the coating is high.
Referring to fig. 6, a cylindrical powder feeding pipe 401 according to an embodiment of the present invention includes a cylindrical slit 4011, a cylindrical connection pipe 4012, and a tapered transition pipe 4013 for connecting the cylindrical slit 4011 and the cylindrical connection pipe 4012, wherein the cylindrical connection pipe 4012 is used for connecting an external powder feeding pipe, and illustratively, the cylindrical connection pipe 4012 is internally threaded and thus can be fixed to the external powder feeding pipe by a threaded connection.
Referring to fig. 1, 2, 3, 6, and 7, in the coaxial powder feeding device according to the embodiment of the present invention, cooling cavities 5 are disposed on two sides of a laser beam cavity 3, specifically, a left cooling cavity 501 is disposed on an outer side of a left powder feeding cavity 402, a right cooling cavity 502 is disposed on an outer side of a right powder feeding cavity 403, and the left cooling cavity 501 and the right cooling cavity 502 are symmetrically distributed on two sides of the laser beam cavity 3. Wherein, the left cooling cavity 501 and the right cooling cavity 502 are rectangular inner cavities which are obliquely arranged, the side wall of the rectangular inner cavity is provided with a cooling liquid circulating pipe mounting hole 503, and the included angle between the left cooling cavity 501 and the right cooling cavity 502 is 30-45 degrees. The cooling liquid circulating pipe mounting hole 503 is used for mounting a cooling liquid circulating pipe to realize rapid cooling of the coaxial powder feeding device according to the embodiment of the invention.
The first connection mode for fixing the coaxial powder feeding device on other parts provided by the embodiment of the invention is side installation and fixation. Referring to fig. 1, 2, 3 and 4, in the side-mounting fixing method, the connecting device 2 is fixed to the side surface of the device body 1, wherein the connecting device 2 and the device body 1 may be integrally formed or separately processed and then fixed by bolts or screws. Referring to fig. 1, 2, 3 and 4, a dovetail groove 201 is provided on the connecting device 2, and a thread counter bore 202 is provided at the bottom of the dovetail groove 201. The dovetail groove 201 is used for being matched with T-shaped sliders on other fixed components to achieve structural limiting of the coaxial powder feeding device in the embodiment of the invention, and further, a fastening bolt or a screw is installed in the threaded counter bore 202 to achieve reliable installation of the coaxial powder feeding device in the embodiment of the invention. The arrangement of the dovetail groove 201 can ensure the installation accuracy of the coaxial powder feeding device in the embodiment of the invention.
Referring to fig. 5, 8 and 9, 3 threaded counterbores 202 are arranged at the bottom of the dovetail groove 201, the 3 threaded counterbores 202 are arranged in a three-star structure, that is, the centers of the 3 threaded counterbores 202 are respectively located at three vertexes of an isosceles triangle, and the threaded counterbores 202 are used for installing a threaded fastening device. The threaded fastening means may be a screw or a bolt. The 3 threaded counter bores 202 arranged in a three-star pile structure are matched with each other, so that the installation precision of the coaxial powder feeding device in the embodiment of the invention can be further ensured.
Example two
Referring to fig. 11 to 22, on the basis of the first embodiment, the coaxial powder feeding device according to the second embodiment of the present invention adopts a split structure that is spliced and fixed to each other to reduce the processing difficulty of the device body. And the second embodiment provides a connection way for fixing the coaxial powder feeding device on other components, which is different from the first embodiment, on the basis of the first embodiment, but the second embodiment can also adopt the connection way for fixing the coaxial powder feeding device on other components, which is limited in the first embodiment; similarly, the connection method for fixing the coaxial powder feeding device to other components adopted in the second embodiment is also applicable to the first embodiment.
Referring to fig. 11, 13, 14, 16, 17, 18, 19, 20, 21 and 22, the device body 1 according to the second embodiment of the present invention includes a device central body 101, and a left body 102 and a right body 103 symmetrically disposed on both sides of the device central body 101, wherein the left powder feeding cavity 402 is disposed along a joint surface between the left body 102 and the device central body 101, and the right powder feeding cavity 403 is disposed along a joint surface between the right body 103 and the device central body 101.
As shown in fig. 19, 20, 21 and 22, the center body 101, the left body 102 and the right body 103 of the device according to the embodiment of the present invention may be separately machined and then fixed to each other by screws or bolts. Meanwhile, the device body 1 adopting the split structure is used for reducing the processing difficulty of the left powder feeding cavity and the right powder feeding cavity which are formed by the cylindrical powder feeding pipes 401. Referring to fig. 19, 20, 21 and 22, the cylindrical powder feeding tube 401 is a split structure, and the cylindrical powder feeding tube 401 includes a left tube 4011 and a right tube 4012 that are matched with each other in a split manner, wherein the left tube 4011 of the cylindrical powder feeding tube 401 of the left powder feeding chamber 402 is located on the side of the left body 102 opposite to the device central body 101, and the right tube 4012 of the cylindrical powder feeding tube 401 of the right powder feeding chamber 403 is located on the side of the right body 103 opposite to the device central body 101.
That is, referring to fig. 17, 18, 19, 20, 21 and 22, the cylindrical powder feeding tube 401 is divided into a left part and a right part which are spliced and matched with each other, wherein the left part and the right part are respectively arranged on the splicing surfaces of the left body 102 and the right body 103 and the device central body 101, that is, a half of the cylindrical powder feeding tube 401 can be processed on the splicing surface of the device central body 101, and the rest parts of the cylindrical powder feeding tube 401 are processed on the splicing surfaces of the left body 102 and the right body 103, so that a complete cylindrical powder feeding tube 401 can be formed after the two parts are spliced with each other. Because the cylindrical powder feeding pipe 401 is a thin pipe which is obliquely arranged, if a splicing structure is not adopted, the processing difficulty is extremely high, and even the qualified cylindrical powder feeding pipe cannot be processed, the split processing of the cylindrical powder feeding pipe is realized by adopting the cylindrical powder feeding pipe with the split structure, the processing difficulty of the cylindrical powder feeding pipe can be greatly reduced, and the processing precision of the cylindrical powder feeding pipe is improved.
Referring to fig. 11, 12, 13, 14 and 15, in the top mounting fixing mode, the connection device 2 is disposed at the upper end of the device body 1, that is, the connection device 2 is fixed at the upper part of the device body 1, wherein the connection device 2 may be integrally formed with or separately processed from the device central body 101, and the connection device 2 may be welded and fixed at the upper part of the device central body 101 or fixed at the device central body 101 by a screw connection or a bolt connection. Referring to fig. 11, 12, 17 and 18, the connecting device 2 is provided with a connecting flange 203, the connecting flange 203 is used for fixing with other parts, and the laser beam cavity 3 penetrates the device body 1 and the connecting device 2.
Referring to fig. 11, 17 and 18, a right cooling cavity 502 is disposed outside the right powder feeding cavity 403, and a left cooling cavity 501 and a right cooling cavity 502 are symmetrically distributed on two sides of the laser beam cavity 3. The left cooling cavity 501 and the right cooling cavity 502 are cooling liquid circulation spaces formed by splicing a left cooling cavity housing 504 and a right cooling cavity housing 505 with the device body 1, respectively, and as shown in fig. 11 and 17, the left cooling cavity housing 504 and the right cooling cavity housing 505 are fixed on two sides of the device body 1 by bolts or screws, respectively. Specifically, referring to fig. 17, a left cooling chamber housing 504 and a right cooling chamber housing 505 are respectively fixed to the outer sides of a left pipe body 4011 and a right pipe body 4012, wherein the left cooling chamber housing 504 and the left pipe body 4011 are spliced with each other to form a left cooling chamber 501, and the right cooling chamber housing 505 and the right pipe body 4012 are spliced with each other to form a right cooling chamber 502. The left cooling cavity 501 and the right cooling cavity 502 are formed by adopting a splicing structure, so that the processing difficulty of the cooling cavity can be reduced. Illustratively, the left cooling cavity 501 and the right cooling cavity 502 are both rectangular cavities.
Referring to fig. 11, 12, 13, 17 and 18, each of the cylindrical powder feeding pipes 401 included in the left powder feeding chamber 402 and the right powder feeding chamber 403 is connected to an external powder feeding head 404, and the external powder feeding head 404 and the cylindrical powder feeding pipes 401 may be connected by a screw. As described with reference to fig. 20 and 21, the two side cylindrical powder feeding pipes 401 included in the left powder feeding chamber 402 and the right powder feeding chamber 403 are obliquely arranged with respect to the central cylindrical powder feeding pipe 401 (the cylindrical powder feeding pipe located at the middle position of the apparatus body 1), that is, the powder discharging directions of the plurality of cylindrical powder feeding pipes 401 arranged in the left powder feeding chamber 402 and the right powder feeding chamber 403 converge toward the central position, so that the powder feeding effects of the left powder feeding chamber 402 and the right powder feeding chamber 403 can be ensured.
Referring to fig. 11, 12, 13, 17 and 18, the connecting device 2 is provided at the upper end of the device body 1, the connecting device 2 is provided with a connecting flange 203, the connecting flange 203 is used for fixing with other parts, and the laser beam cavity 3 penetrates through the device body 1 and the connecting device 2. Specifically, referring to fig. 11, 17 and 18, the connecting device 2 includes a fixing base 204, a connecting flange 203 fixed on the fixing base 204, and external powder feeding head mounting plates 205 respectively located at two sides of the fixing base 204, wherein the fixing base 204 and the connecting flange 203 are integrally formed, the fixing base 204 is fixed at the upper end of the device body 1 by bolts or screws, the external powder feeding head mounting plate 205 is fixed on the device body 1 by bolts or screws, the external powder feeding head mounting plate 205 is provided with external powder feeding head mounting holes 206, and the external powder feeding head 404 can be fixed in the external powder feeding head mounting holes 206 by screw connection. The lower surface of the external powder feeding head mounting plate 205 and the lower surface of the fixed base 204 are arranged in an obtuse-angle inclined mode.
The embodiment of the invention provides a coaxial powder feeding device which comprises a device body and a connecting device fixed on the device body, wherein a laser beam cavity with an inverted conical structure and powder feeding cavities with cylindrical structures distributed on two sides of the laser beam cavity are arranged on the device body, the convergence point of the section center line of the powder feeding cavity and the section center line of the laser beam cavity is in the same plane, namely the convergence point of the laser beam and the convergence point of the powder feeding cavity are distributed in the same horizontal plane, and a powder cake formed by the powder feeding cavity outlet has a certain diameter and can be converged with the laser beam above the convergence point of the laser beam, so that most of the energy of the laser beam is used for heating, melting and accelerating the powder particles in flight, only a very small amount of beam energy can heat the substrate, the substrate is prevented from being excessively heated to greatly reduce the dilution rate, and the deformation amount and the dilution rate of the substrate are reduced, the powder utilization rate and the processing efficiency can be greatly improved, and the effective components of the coating are not influenced by the matrix material, so that the corrosion-resistant and wear-resistant effects of the coating are improved.
It will be apparent to those skilled in the art that various modifications and variations can be made in the embodiments of the present invention without departing from the spirit or scope of the embodiments of the invention. Thus, if such modifications and variations of the embodiments of the present invention are within the scope of the claims of the present invention and their equivalents, the present invention is also intended to encompass such modifications and variations.
Claims (10)
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| CN201911329582.7A CN110952088B (en) | 2019-12-20 | 2019-12-20 | A coaxial powder feeding device |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2510502Y (en) * | 2001-10-18 | 2002-09-11 | 北京有色金属研究总院 | Laser coating coaxial powder-delivery nozzle |
| JP2005105414A (en) * | 2003-09-11 | 2005-04-21 | Shunji Murano | Linearly and uniformly discharging device, atomizing device, thin film deposition device, pattern forming device, three-dimensional forming device, and cleaning device |
| CN105522150A (en) * | 2015-12-30 | 2016-04-27 | 哈尔滨工业大学 | Uniform powder feeding head suitable for production or deposition of semiconductor laser enhanced material |
| CN211665177U (en) * | 2019-12-20 | 2020-10-13 | 西安交通大学 | A coaxial powder feeding device |
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2019
- 2019-12-20 CN CN201911329582.7A patent/CN110952088B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2510502Y (en) * | 2001-10-18 | 2002-09-11 | 北京有色金属研究总院 | Laser coating coaxial powder-delivery nozzle |
| JP2005105414A (en) * | 2003-09-11 | 2005-04-21 | Shunji Murano | Linearly and uniformly discharging device, atomizing device, thin film deposition device, pattern forming device, three-dimensional forming device, and cleaning device |
| CN105522150A (en) * | 2015-12-30 | 2016-04-27 | 哈尔滨工业大学 | Uniform powder feeding head suitable for production or deposition of semiconductor laser enhanced material |
| CN211665177U (en) * | 2019-12-20 | 2020-10-13 | 西安交通大学 | A coaxial powder feeding device |
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