Encircling light wire coaxial spraying material increasing device

Abstract

The utility model discloses a surrounding light wire coaxial spraying material increasing device which comprises a shell, and an opening is formed in the end of the shell; the wire protection pipe is arranged in the shell, and a channel is formed between the outer side of the wire protection pipe and the shell; the laser transmitter is used for transmitting an annular light beam to the channel; the focusing lens is installed in the channel and used for focusing the annular light beam on the wire exposed out of the wire protection tube; and the gas spraying piece is mounted on the inner wall of the shell and used for spraying gas so as to spray the wires melted by the laser out of the opening. Wherein the laser emitter emits an annular light beam, the wire protection tube is arranged in the middle of the annular light beam to protect a wire, the focusing lens can focus the annular light beam to the wire, so that the wire is melted, and finally the wire is driven by the air injection piece to be sprayed out. Compared with a traditional light inner side wire feeding structure with multiple light sources, the device has the advantages that the number of the light sources is reduced, the structure is simplified on the premise that the wires are uniformly heated, and the production cost and the subsequent maintenance cost of the device are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of additive manufacturing, and particularly to an additive device for surrounding optical fiber coaxial spraying. Background Art

[0002] The wire feeding laser spraying method has the advantages of high material utilization rate, low environmental pollution, low material cost, and little influence by the space environment, and has broad development prospects. It is widely used in the fields of surface treatment, additive manufacturing, etc. The wire feeding laser spraying method mainly uses a laser to melt the wire, and then sprays the molten wire onto the surface of the substrate by ejecting high-pressure gas. For the setting method of the wire and the optical path, currently, there are two main architectures: the wire feeding structure outside the optical path and the wire feeding structure inside the optical path.

[0003] The wire feeding structure outside the optical path refers to the structure in which the wire is transported outside the optical path. Its processing platform is easy to build. However, due to the directionality of wire feeding, the wire is unevenly heated, making it difficult to meet the consistency of spraying effects and performance in all directions. Therefore, the wire feeding structure inside the optical path is more favored on the market currently. The wire feeding structure inside the optical path generally consists of multiple laser light sources. The wire is arranged between each optical path and is jointly heated by each optical path, so the heating is more uniform. However, the increase in the number of light sources makes the volume of the optical fiber coaxial head larger and the optical path not easy to adjust. Moreover, due to the certain bending arc of the wire tube for wire feeding, it is easy to cause that each laser light source does not focus on the wire. At the same time, there are also problems such as high usage cost and maintenance cost.

[0004] Therefore, a new type of wire feeding structure inside the optical path is needed, which can simplify the structure, reduce the number of light sources, and thus reduce the production cost of the equipment and the subsequent maintenance cost. Summary of the Invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. For this purpose, the present invention provides an additive device for surrounding optical fiber coaxial spraying, which can simplify the structure, reduce the number of light sources, and thus reduce the production cost of the equipment and the subsequent maintenance cost.

[0006] According to an embodiment of the present invention, the additive device for surrounding optical fiber coaxial spraying includes:

[0007] A housing, an opening is provided at the end of the housing;

[0008] A wire protection tube, the wire protection tube is arranged inside the housing. The inner side of the wire protection tube is used for placing the wire, and a channel is formed between the outer side of the wire protection tube and the housing;

[0009] A laser emitter, the laser emitter emits a ring-shaped light beam into the channel;

[0010] A focusing lens, which is installed in the channel and is used to focus the annular light beam on the wire exposed from the wire protection tube;

[0011] An air jet member, which is installed on the inner wall of the housing. An air jet opening is formed on the air jet member, and the air jet opening is used to eject gas to eject the wire melted by the laser from the opening.

[0012] The circumferential light wire coaxial spraying additive manufacturing device according to the embodiment of the present invention has at least the following beneficial effects: The laser emitter emits an annular light beam, the wire protection tube is arranged in the middle of the annular light beam to protect the wire, and the focusing lens can focus the annular light beam on the wire exposed from the end of the wire protection tube, so as to complete the melting of the wire. Finally, the molten wire is ejected by the air jet member. Compared with the traditional light inner wire feeding structure with multiple light sources arranged, this device reduces the number of light sources, simplifies the structure on the premise of ensuring uniform heating of the wire, and reduces the production cost and subsequent maintenance cost of the device.

[0013] According to some embodiments of the present invention, the circumferential light wire coaxial spraying additive manufacturing device further includes a reflection assembly, and the light beam emitted by the laser emitter enters the channel after being reflected by the reflection assembly.

[0014] According to some embodiments of the present invention, the reflection assembly includes a first reflector and a second reflector, and the light beam emitted by the laser emitter is sequentially reflected by the first reflector and the second reflector and enters the channel.

[0015] According to some embodiments of the present invention, the surface of the second reflector in contact with the annular light beam is a reflection surface. The second reflector is provided with a first through hole penetrating to the reflection surface, and the wire protection tube passes through the first through hole. The first through hole is located at the center of the projection of the annular light beam on the reflection surface.

[0016] According to some embodiments of the present invention, one end of the wire protection tube close to the opening is the wire feeding end, and the outer diameter of the wire feeding end gradually decreases along the optical path propagation direction.

[0017] According to some embodiments of the present invention, the part of the housing from the focusing lens to the opening is the emitting part, and the inner diameter of the emitting part gradually decreases along the optical path propagation direction.

[0018] According to some embodiments of the present invention, a second through hole through which the wire protection tube can pass is formed in the middle of the focusing lens.

[0019] According to some embodiments of the present invention, the focusing lens is provided with a plurality of steps, and the refractive indices of the respective steps are different.

[0020] According to some embodiments of the present invention, there are a plurality of air jet openings on the air jet member, and each of the air jet openings is distributed in a circumferential array around the central axis of the wire protection tube.

[0021] According to some embodiments of the present invention, the coaxial spraying additive manufacturing device for surrounding optical filaments further includes a protective gas supply device, and the protective gas supply device is connected to the wire protection tube to supply protective gas into the wire protection tube.

[0022] Additional aspects and advantages of the present invention will be given in part in the following description, will become apparent in part from the following description, or will be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described below in conjunction with the drawings and embodiments, where:

[0024] Figure 1 is a cross-sectional view of the coaxial spraying additive manufacturing device for surrounding optical filaments according to an embodiment of the present invention;

[0025] Figure 2 is a three-dimensional view of the second reflector 620 in the coaxial spraying additive manufacturing device for surrounding optical filaments according to an embodiment of the present invention;

[0026] Figure 3 is a three-dimensional cross-sectional view of the focusing lens 400 in the coaxial spraying additive manufacturing device for surrounding optical filaments according to an embodiment of the present invention.

[0027] Reference numerals: 100 - housing, 110 - opening, 200 - wire protection tube, 210 - wire, 300 - laser emitter, 400 - focusing lens, 410 - second through hole, 420 - step, 500 - air jet member, 610 - first reflector, 620 - second reflector, 621 - first through hole. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0029] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as up, down, front, back, left, right, etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

[0030] In the description of the present invention, "several" means more than one, "multiple" means more than two, and understandings such as "greater than", "less than", "exceeding", etc. do not include the present number, while understandings such as "above", "below", "within", etc. include the present number. If there is a description of "first" and "second", it is only for the purpose of distinguishing technical features and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0031] In the description of the present invention, unless otherwise clearly defined, terms such as "set", "installed", "connected", etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific content of the technical solution.

[0032] In the description of the present invention, the description with reference to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0033] The wire-feeding laser spraying method has the advantages of high material utilization rate, low environmental pollution, low material cost, and little influence by the space environment, and has broad development prospects. It is widely used in the fields of surface treatment, additive manufacturing, etc. The wire-feeding laser spraying method mainly uses a laser to melt the wire, and then sprays the molten wire onto the surface of the substrate by means of ejecting high-pressure gas. For the setting method of the wire and the optical path, currently the mainstream has two architectures: the outer-side-of-light wire-feeding structure and the inner-side-of-light wire-feeding structure.

[0034] The outer-side-of-light wire-feeding structure refers to a structure in which the wire is conveyed outside the optical path. Its processing platform is easy to build, but due to the directivity of wire feeding, the wire is unevenly heated, and it is difficult to meet the consistency of spraying effects and performance in all directions. Therefore, the inner-side-of-light wire-feeding structure is more favored in the current market. The inner-side-of-light wire-feeding structure generally consists of multiple laser light sources, and the wire is arranged between each optical path and is jointly heated by each optical path, so the heating is more uniform. However, the increase in the number of light sources makes the volume of the light-wire coaxial head larger, and the optical path is not easy to adjust; moreover, due to the certain bending arc of the wire tube for wire feeding, it is easy to cause that each laser light source does not focus on the wire; at the same time, there are also problems such as high use cost and high maintenance cost.

[0035] Therefore, a new type of inner-side-of-light wire-feeding structure is needed, which can simplify the structure, reduce the number of light sources, and thus reduce the production cost of the equipment and the subsequent maintenance cost.

[0036] In response to this, the present application proposes a circumferential optical fiber coaxial spraying additive manufacturing device. A ring-shaped light beam is emitted by a laser emitter 300, and a wire protection tube 200 is arranged in the middle of the ring-shaped light beam to protect the wire. A focusing lens 400 can focus the ring-shaped light beam onto the wire exposed from the end of the wire protection tube 200, thereby completing the melting of the wire. Finally, the molten wire is ejected by a jetting member 500. Compared with the traditional inner-light wire feeding structure with multiple light sources arranged, this device reduces the number of light sources, simplifies the structure on the premise of ensuring uniform heating of the wire, and reduces the production cost and subsequent maintenance cost of the device.

[0037] Referring to Figure 1 , the circumferential optical fiber coaxial spraying additive manufacturing device in the embodiment of the present application includes a housing 100, a wire protection tube 200, a laser emitter 300, a focusing lens 400, and a jetting member 500. Among them, the housing 100 is the main structure of this circumferential optical fiber coaxial spraying additive manufacturing device, which is used to load other components and protect the components. A space for the wire 210 to pass through is provided inside the wire protection tube 200, and a gap is left between its outside and the inner wall of the housing 100 to form a channel for the laser to pass through. Thus, the wire protection tube 200 isolates the wire 210 from the laser, playing a role in heat insulation to prevent the wire from melting during transportation. The laser emitter 300 is used to emit a ring-shaped light beam around the outside of the wire protection tube 200, and the focusing lens 400 is used to focus the ring-shaped light beam to melt the wire exposed from the end of the wire protection tube 200. The jetting member 500 is used to eject gas to eject the molten wire.

[0038] Specifically, an opening 110 is provided at the end of the housing 100, and the molten wire is ejected from the opening 110 onto the surface of the substrate to be processed. The wire protection tube 200 is arranged inside the housing 100. The inside of the wire protection tube 200 is used to place the wire 210, and a channel is formed between the outside of the wire protection tube 200 and the housing 100. The laser emitter 300 emits a ring-shaped light beam into the channel; the focusing lens 400 is installed in the channel and is used to focus the ring-shaped light beam on the wire exposed from the wire protection tube 200. The jetting member 500 is installed on the inner wall of the housing 100, and a jetting port is provided on the jetting member 500. The jetting port is used to eject gas to eject the wire 210 melted by the laser from the opening 110.

[0039] Optionally, this circumferential optical fiber coaxial spraying additive manufacturing device further includes a reflection assembly. The light beam emitted by the laser emitter 300 enters the channel after being reflected by the reflection assembly. Thus, the installation position of the laser emitter 300 can be adjusted by using the reflection of the reflection assembly to avoid the installation of the wire protection tube 200.

[0040] Specifically, the reflection component includes a first reflector 610 and a second reflector 620. The light beam emitted by the laser emitter 100 is reflected by the first reflector 610 and the second reflector 620 in sequence and enters the channel. Reflection surfaces that are in contact with the annular light beam and are used for reflecting the light beam are provided on both the first reflector 610 and the second reflector 620. It should be noted that, referring to Figure 2 , the second reflector 620 is provided with a first through hole 621 that penetrates through to the reflection surface. The wire protection tube 200 passes through the first through hole 621. The first through hole 621 is located at the center of the projection of the annular light beam on the reflection surface, so that the annular light beam will not enter the first through hole 621.

[0041] Furthermore, one end of the wire protection tube 200 close to the opening 110 is the wire feeding end. The outer diameter of the wire feeding end gradually decreases along the optical path propagation direction, so as to avoid interference between the optical path after passing through the focusing lens 400 and converging and the outer wall of the wire protection tube 200, resulting in the laser not contacting the wire 210.

[0042] Furthermore, the part of the housing 100 from the focusing lens 400 to the opening 110 is the exit part. The inner diameter of the exit part gradually decreases along the optical path propagation direction, so as to adapt to the narrowed optical path refracted by the focusing lens 400, reduce the volume of the housing 100 to reduce its own weight, and also save production materials.

[0043] Furthermore, referring to Figure 3 , the middle part of the focusing lens 400 is provided with a second through hole 410 through which the wire protection tube 200 can pass, so as to be able to avoid the wire protection tube 200.

[0044] Optionally, in some embodiments, the focusing lens 400 is specifically a convex mirror with a hole in the middle. It is a transparent component. When the annular light beam passes through the focusing lens 400, the focusing lens 400 can refract the light and make the optical path of the annular light beam converge towards the middle, and finally focus on the wire extending from the wire protection tube 200. In this embodiment, the focusing lens 400 is provided with a plurality of steps 420. The surfaces of each step 420 are all curved surfaces, and the curvature of the curved surfaces of each step 420 is different, so that the refractive index of each step 420 is different. The purpose of this design is to make the optical path located on the outside pass through the step 420 with a higher refractive index, and the optical path located on the inside pass through the step 420 with a lower refractive index, and finally make the optical paths located at different positions converge at one point, which is beneficial to the precise focusing of the optical paths at each position. As for the specific refractive index of each step 420, it can be adjusted according to the actual situation to adapt to different focusing situations.

[0045] Furthermore, there are multiple jet orifices on the jetting member 500, and each jet orifice is distributed in a circumferential array around the central axis of the wire protection tube 200, and each jet orifice is oriented towards the opening 110 of the housing 100. Thus, the jet orifices distributed in a circumferential array can eject gas uniformly, so as to apply a uniform force to the molten wire 210, avoiding the deviation of the ejection direction of the wire 210 due to uneven force, which affects the subsequent spraying quality and accuracy.

[0046] Furthermore, the present circumferential light wire coaxial spraying additive manufacturing device further includes a protective gas supply device, which is connected to the wire protection tube 200 to supply protective gas into the wire protection tube 200, playing a more sufficient protective role for the wire 210. The protective gas mentioned in this application is specifically an inert gas, including but not limited to argon and helium, which is used to prevent the air in the wire protection tube 200 from exploding and burning under the high temperature of laser irradiation.

[0047] The embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the above embodiments, and various changes can be made without departing from the gist of the present invention within the knowledge scope of those of ordinary skill in the art. In addition, the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

Claims

1. A coaxial spraying additive manufacturing device around a light filament, characterized in that, Comprising: A housing having an opening at its end; A wire protection tube disposed inside the housing, with the inner side of the wire protection tube for placing a wire, and a channel formed between the outer side of the wire protection tube and the housing; A laser emitter that emits an annular beam into the channel; A focusing lens installed in the channel for focusing the annular beam on the wire exposed from the wire protection tube; An air jet member installed on the inner wall of the housing, with an air jet opening formed on the air jet member, and the air jet opening for jetting gas to jet out the wire melted by the laser from the opening.

2. The coaxial spraying additive manufacturing device with surrounding optical filaments according to claim 1, characterized in that: The circumferential light wire coaxial spraying additive manufacturing device further includes a reflection assembly, and the beam emitted by the laser emitter enters the channel after being reflected by the reflection assembly.

3. The circumferential light filament coaxial spraying additive manufacturing device according to claim 2, characterized in that: The reflection assembly includes a first reflector and a second reflector, and the beam emitted by the laser emitter is successively reflected by the first reflector and the second reflector and enters the channel.

4. The circumferential light filament coaxial spraying additive manufacturing device according to claim 3, wherein: The surface of the second reflector in contact with the annular beam is a reflection surface, the second reflector is provided with a first through hole penetrating to the reflection surface, the wire protection tube passes through the first through hole, and the first through hole is located at the center of the projection of the annular beam on the reflection surface.

5. The circumferential light filament coaxial spraying additive manufacturing device according to claim 1, wherein: One end of the wire protection tube close to the opening is a wire feeding end, and the outer diameter of the wire feeding end gradually decreases along the optical path propagation direction.

6. The circumferential light filament coaxial spraying additive manufacturing device according to claim 5, wherein: The part of the housing from the focusing lens to the opening is an exit part, and the inner diameter of the exit part gradually decreases along the optical path propagation direction.

7. The circumferential light filament coaxial spraying additive manufacturing device according to claim 1, characterized in that: A second through hole through which the wire protection tube can pass is formed in the middle of the focusing lens.

8. The circumferential light filament coaxial spraying additive manufacturing device according to claim 1, wherein: The focusing lens is provided with a plurality of steps, and the refractive indices of the respective steps are different.

9. The circumferential light filament coaxial spraying additive manufacturing device according to claim 1, wherein: The air jet member has a plurality of air jet openings, and the respective air jet openings are distributed in a circumferential array around the central axis of the wire protection tube.

10. The circumferential light filament coaxial spraying additive manufacturing device according to any one of claims 1 to 9, characterized in that: The circumferential light wire coaxial spraying additive manufacturing device further includes a protective gas supply device, and the protective gas supply device is connected to the wire protection tube to supply protective gas into the wire protection tube.

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