KR101058382B1 - Nozzle for laser metal coating apparatus - Google Patents

Abstract

PURPOSE: A nozzle for a laser metal coating device is provided to ensure good quality of coating or alloy through stable and uniform supply of metal powder. CONSTITUTION: A nozzle for a laser metal coating device comprises a first nozzle member(11), a second nozzle member(13), a body(15), a bracket(17), and a third nozzle member. The second nozzle member is inserted inside the first nozzle member with a gap and has a laser beam emission hole in the center. The body is coupled with the second nozzle member to form a laser beam emission route. The bracket comprises a laser generator(5). The third nozzle member guides the air provided from outside to a gap between the first nozzle member and the third nozzle member, thereby forming an air curtain hole around injected powder.

Description

Nozzle For Laser Metal Coating Apparatus

The present invention relates to a nozzle for a laser metal coating apparatus for coating by supplying a laser beam and a metal powder of a metal powder to the surface of the metal product, and more particularly to improve the structure of the nozzle to supply a fixed amount of metal powder The present invention relates to a nozzle for a laser coating apparatus that can guarantee good coating performance and can reduce work time and induce strain of a base metal through a precise and optimal amount of coating process by a laser beam.

In general, products requiring high strength, elongation, heat resistance and good surface quality require local reinforcement.

Conventionally, a dipping process of repeatedly immersing a base material in a solution such as a zirconia sol, but when the shape of the coating target product is not flat, a deviation occurs in the thickness of the coating layer. Causes a problem that the stress is concentrated to a relatively thin place. In order to solve this problem, there is also a method of performing zirconia sol by spray coating, but this also has a problem in that the formation time of the coating layer is long and the process is complicated, and the formation of a simple film on the surface of the product is not only simple.

In order to solve this problem, recently, a laser coating device for welding or alloying a surface of a metal product by simultaneous cooperative operation of a laser beam and an metal powder stream has been developed. And a power supply provided as part of the regulating device and the integral package.

The laser beam melts a relatively small area of the product surface, and a controlled volume of alloying particles is transported into the melt pool by a powder flow stream. In laser welding, an article of metal or other material may have an alloyed or otherwise treated surface by simultaneous cooperative operation of the laser beam and the alloy powder.

Laser-based metal coatings use a variety of metal powders and are most commonly used for mechanical parts that require abrasion and corrosion resistance. It can also be used to rebuild worn parts and tools.

 Typically, the laser beam melts a portion of the outer surface of the relatively small volume of the article and the powder system delivers a controlled volume of alloying powder to the melt. The alloying powder is dispersed through this melt to alter, replenish or add the composition of the skin in a controllable manner.

For example, Korean Patent Laid-Open Publication No. 10-2005-0037497 discloses a method for manufacturing a valve seat of a vehicle, and the valve seat is made of a mixture or alloy with an aluminum-iron alloy and one or more additional components. The aluminum-iron alloy is disclosed to be fused to the valve seat by a laser beam.

However, the conventional laser coating apparatus nozzle has a disadvantage in that it is difficult to constantly control the supply amount in the process of supplying the metal powder, and as a result, there is a disadvantage in that the coating or alloy quality is not uniform, and the pipe for supplying the metal powder is easily blocked. There was a problem that the phenomenon occurs frequently.

The present invention was created to solve the problems of the prior art as described above, an object of the present invention is to enable a stable and uniform supply of metal powder to maintain a good quality of the coating or alloy coating or alloy It is to provide a nozzle for a laser coating device that can improve the quality of the target product.

Another object of the present invention to provide a nozzle for a laser metal coating apparatus that can eliminate the closed end due to powder scattering to suppress the phenomenon that the powder is scattered to the outside by the purging gas.

Another object of the present invention is to adjust the size of the passage by moving one of the elements forming the passage through which the powder is supplied in the vertical direction, and as a result, the amount of powder ejected according to the base material by controlling the flow rate of the powder It is to provide a nozzle for a laser metal coating apparatus that can be adjusted.

A nozzle for a laser coating apparatus according to an embodiment of the present invention for realizing the above object, the body is formed with a laser beam exit hole for the laser beam is emitted to the center; A powder supply line connected to one side of the body to supply a mixture of the carrier gas and the metal powder, and a purging gas supply line connected to a position not interfering with the powder supply line to supply a purging gas; It is formed in the body is connected to the powder supply line is supplied to the carrier gas and metal powder is supplied to the powder flow passage and the purging gas supply line is connected to the powder flow passage and the purging gas supply line to eject to one side of the laser beam exit hole is supplied with It is ejected through a laser beam exit hole, the first and second cooling channels configured to surround the outer surface of one side of the body and the cooling water is circulated and supplied from the outside, and the first nozzle portion of the conical shape is inserted at intervals therein And a third nozzle portion configured to receive air from the outside and flow air between the first nozzle portion and to form an air curtain hole around the ejected powder.

As a preferred feature of the invention, the first nozzle portion is provided with one end of the powder supply line is connected to the inside, one end of the purging gas supply line for supplying the purging gas to one side of the body is connected to the inside It is to be provided.

In another preferred embodiment of the present invention, the first cooling channel is provided to surround one side of the body proximate to the exit from which the laser beam is emitted, and the second cooling channel surrounds one side of the body proximate to the laser oscillator. It is to be provided.

In another preferred embodiment of the present invention, the body is provided with a connection ring having a threaded line formed on an inner circumferential surface at one end thereof, and the second nozzle portion is screwed to the fastening ring to enable position movement in a vertical direction. 1 is provided with a screw portion to adjust the flow amount of the powder by adjusting the distance to the nozzle portion.

As another preferred feature of the present invention, a 'C' shaped air curtain hole is formed to form a 'C' shaped air curtain so that residual powder and carrier gas are discharged to the rear end side with respect to the welding progress direction of the third nozzle portion. Is in.

In the nozzle for a laser coating apparatus according to the present invention, a laser beam is emitted to a center thereof, and an appropriate amount of metal powder is supplied through the gate of the nozzle by a carrier gas, and a simple surface treatment is performed by spraying a purging gas. One structure enables precise and optimized coating or alloying of coatings or alloying objects, and the use of a laser beam can significantly reduce the time required for work and reduce strain on the substrate. There is this.

Therefore, since it can be applied to products requiring high strength, elongation and heat resistance, and good surface quality, including worn or damaged metal parts, there is an advantage that industrial useful effects are expected.

In addition, in the present invention, the powder ejected to the surface of the base material is scattered to the outside by the purging gas ejected to the inside, but the air ejected from the outside of the ejected powder forms an air curtain, resulting in the By suppressing the scattering as much as possible can improve the coating or alloy quality and has the advantage of minimizing the waste of powder.

In addition, the present invention is to supply the optimum amount of powder according to the type of the base material, coating or alloy through the control of the amount of powder by controlling the interval between the first nozzle portion and the second nozzle portion forming the passage through which the powder is supplied There is an advantage to enable this.

The features and advantages of the present invention will become more apparent from the following detailed description based on the accompanying drawings. Prior to this, the terms or words used in this specification and claims are not to be interpreted in a conventional and dictionary sense, and the inventors may appropriately define the concept of terms in order to best explain their invention in the best way possible. It should be interpreted as meaning and concept corresponding to the technical idea of the present invention based on the principle that the present invention.

1 is a perspective view showing a nozzle for a laser coating apparatus according to a first embodiment of the present invention;
Figure 2 is an exploded perspective view for explaining the configuration of a nozzle for a laser coating apparatus according to a first embodiment of the present invention,
3 to 4 are cross-sectional views for explaining the internal configuration in the combined state of the nozzle for the laser coating apparatus according to the first embodiment of the present invention,
5 is a perspective view showing a nozzle for a laser metal coating apparatus according to a second embodiment of the present invention;
6 is an exploded perspective view for explaining the configuration of FIG.
7 and 8 are cross-sectional views for explaining the internal configuration of FIG.
FIG. 9 is a cross-sectional view taken along a line 'AA' of FIG. 8;
10 is a view for explaining the operation of the nozzle for the laser metal coating apparatus of FIG.
11 is a view for explaining the adjustment operation of the powder flow passage of FIG.

Hereinafter, a nozzle for a laser coating apparatus according to the present invention will be described with reference to the accompanying drawings.

First, it should be noted that the same components or parts among the drawings are denoted by the same reference numerals as possible. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

1 is a perspective view showing a nozzle for a laser coating apparatus according to the present invention, Figure 2 is an exploded perspective view for explaining the configuration of a nozzle for a laser coating apparatus according to the present invention.

3 to 4 are cross-sectional views for explaining an internal configuration in a coupled state of the nozzle for the laser coating apparatus according to the present invention.

As shown in the drawing, the nozzle for laser coating apparatus 1 of the present invention is a powder supply line 20 for supplying a metal powder and a carrier gas, and a purging gas supply line 50 for supplying a purging gas. It is connected to each one side of the 10 and the body 10, and is configured to guide and emit a laser beam to the center.

The nozzle 1 for a laser coating apparatus of the present invention includes a body 10 forming an outer cylinder 26, a powder supply line 20 connected to the body 10 to supply a carrier gas and metal powder, respectively; The first and second cooling channels 30 and 40 are configured to surround one side of the body 10 to cool the supply water, and purging gas, which is an inert gas, is injected into the body 10. Composed of purging gas supply line 50 to supply

The body 10 has a configuration in which a laser beam exit hole 16 through which a laser beam is emitted is formed at the center, and the body 10 is connected to a powder supply line 20 to be described later to receive a carrier gas and a metal powder. A powder flow passage 25 is formed in which a conduit is formed so as to eject to one side of the laser beam exit hole 16. Here, the powder flow passage 25 is formed to have an inclination angle with respect to the laser beam exit hole 11 from which the laser beam is emitted.

On the other hand, the purging gas supply line 50 is connected to one end of the body 15 is ejected to the outside through the laser beam exit hole 16.

Looking at the configuration of such a body 10 in detail with reference to Figures 3 to 4 as follows.

The body 10 is provided in a conical shape in which the diameter is reduced while proceeding in the direction in which the laser beam is emitted, the first nozzle portion 11 having a space therein; The second nozzle part which is provided at intervals in the interior of the first nozzle part 11 and has a laser beam exit hole 11 formed at the center thereof is provided in a conical shape similarly to the first nozzle part 11. 13 and a bracket which is coupled to one end of the second nozzle part 13 to form a body 15 for forming a path from which the laser beam is emitted and a laser oscillator 5 connected to the body 15. It consists of (17).

Here, one end of the powder supply line 20 is connected to one side of the first nozzle unit 11 constituting the body 10, and the body 15 is oscillated by the laser oscillator 5. An optical module for optically processing a laser beam may be positioned, and one end of the purging gas supply line 50 is connected to the lower side based on the drawing.

Meanwhile, the purging gas supplied through the purging gas supply line is ejected through the laser beam exit hole 16 through which the laser beam is irradiated. Is shielded and flows only to the lower side

The purging gas serves to prevent gas and fume generated during processing from flowing into the nozzle, that is, into the laser beam exit hole 16. In addition, there is an effect of suppressing the generation of the fume by using an inert gas, and suppressing the oxidation of the coating portion. In particular, it is possible to reduce the laser beam blocking effect by the fume.

On the other hand, the body 10 is formed by the first nozzle portion 11 and the second nozzle portion 13 with a gap therebetween, the powder flow passage 25 is formed by this gap.

Reference numerals 18 and 19 denote the spacer members.

The powder supply line 20 is a type of pipe member connected to one side of the body 10 to receive a carrier gas and a metal powder and to supply the powder flow passage 25 formed in the body 10.

Here, the carrier gas is a carrier gas that allows the metal powder to be moved in a constant amount, and any one or more than one of argon and nitrogen may be used.

The gas used in the powder supply line 20 is an inert gas, for example, a mixture of at least one or one or more of nitrogen and argon may be used.

As shown in the drawing, the first cooling channel 30 is configured to surround an upper outer circumferential surface of the second nozzle part 13 constituting the body 10 near the body 15 to supply cooling water from the outside. The circulation line 31 is formed to circulate to suppress the temperature rise of the first nozzle part 11 and the second nozzle part 13 by the laser beam. Reference numeral 35 is a cooling water circulation pipe for supplying and circulating the cooling water to the first cooling channel (30).

Since the first cooling channel 30 may be implemented by a known technique, a detailed description thereof will be omitted.

The second cooling channel 40 is configured to surround the outside of the body 15 constituting the body 10 to form a circulation line for receiving and circulating the cooling water from the outside. Reference numeral 45 denotes a cooling water circulation pipe for supplying cooling water to the second cooling channel 40.

Since the second cooling channel 40 may be implemented by a known technique, a detailed description thereof will be omitted.

Referring to the operation of the nozzle for a laser coating apparatus according to the present invention configured as described above are as follows.

First, the laser beam generated by the laser oscillator 5 is emitted to the outside through the laser beam exit hole 11 formed in the center of the body 10, and at the same time a powder supply line (1) connected to one side of the body 10 Metal powder is supplied together with the carrier gas through 20, and an inert gas of nitrogen or argon is supplied through the purging gas supply line 50 connected to one side of the body 15.

Here, the metal powder supplied with the carrier gas is discharged to the outside around the laser beam exit hole 11 through the powder flow passage 25 formed in the body 10 through the powder supply line 20. Likewise, the purging gas is discharged together with the laser beam through the laser beam exit hole through which the laser beam is emitted through the inside of the body 15 through the purging gas supply line 50.

According to the present invention having the above-described configuration, the powder, which is a metal powder, is flowed together with the carrier gas, so that an appropriate amount can be flowed. It prevents reverse ingress and suppresses fume generation and oxidation of the coating to increase the efficiency of surface treatment.

Meanwhile, while the laser oscillator 5 is operating, the body 15 of the body 10 to which the first cooling channel 30 surrounding the outside of the second nozzle unit 13 and the laser oscillator 5 are connected. Cooling water is circulated and supplied to the second cooling channel 40 surrounding the outside, thereby preventing the body 10 from being rapidly heated.

Hereinafter, a second embodiment of the present invention will be described with reference to FIGS. 5 through 11, and the same components as those of the above-described first embodiment will be denoted by the same reference numerals and detailed description thereof will be omitted.

5 is a perspective view showing a nozzle for a laser metal coating apparatus according to a second embodiment of the present invention, FIG. 6 is an exploded perspective view for explaining the components, and FIGS. 7 and 8 are cross-sectional views.

9 is a cross-sectional view taken along line AA of FIG. 8, and FIG. 10 is a view for explaining the operation of the nozzle for the laser metal coating apparatus of the present embodiment, and FIG. 11 is a view illustrating the powder flow path in the present embodiment. It is a figure for demonstrating an adjustment operation.

The nozzle 1 for the laser metal coating apparatus according to the present embodiment is connected to the body 10 and the body 10 to form the outer cylinder 26 as in the first embodiment described above, respectively, and the carrier gas and the metal A powder supply line 20 for supplying powder, a first and second cooling channels 30 and 40 configured to surround one side of the body 10 and cooling by supplying circulation of cooling water, and the body ( It consists of a purging gas supply line 50 for supplying a purging gas which is an inert gas into the interior of 10).

In the present embodiment, in the construction of the body 10, the powder ejected through the powder flow passage 25 is blocked by air from the outside to suppress the scattering of the powder ejected to the surface of the base material so that a stable coating or alloying operation can be performed. A third nozzle portion 14 forming a wall is further configured, and the size of the powder flow passage 25 is adjusted to add a configuration that enables the flow amount control of the powder.

First, the configuration of the third nozzle unit 14 for forming the air curtain will be described.

The third nozzle part 14 is a member provided in a conical shape that can accommodate the first nozzle part 11 in the first embodiment described above, and is spaced apart from the outer surface of the first nozzle part 11. Equipped with.

That is, the third nozzle unit 14 of the present invention has a configuration in which the air supply line 60 is connected to one side to receive air from the outside, and its upper inner circumferential surface is airtight on the upper outer circumferential surface of the first nozzle unit 11. This is a configuration that is held together.

In addition, a gap is formed between an inner surface of the third nozzle unit 14 and an outer surface of the first nozzle unit 11, and the gap is filled with air introduced through the air supply line 60. It is an air curtain hole 65 which blows toward the surface side and forms an air curtain.

On the other hand, the air curtain hole 65 is preferably provided to form a 'C' shaped air curtain, as shown in Figure 10, which is not all of the powder is ejected to the surface of the base material Since only a part is consumed, the remaining powder is taken out of the body 10. In addition, like the air curtain hole 65, the powder flow passage 25 may be formed to eject the powder in the 'C' shape. Reference numeral wl denotes a welding line.

The third nozzle unit 14 having such a configuration receives air from the outside through the air supply line 60 and blows out the air through the air curtain hole 65. The air thus blown out blocks the air around the powder. By forming the air curtain which is a wall, it becomes possible to suppress that the powder is scattered to the outside by the purging gas inside.

Second, the configuration of the fastening ring 70 for controlling the ejection amount of the powder will be described.

The body 10 of the present invention is provided in a conical shape in which the diameter decreases while advancing in the direction in which the laser beam is emitted, and a third nozzle part 14 having a space formed therein, and the third nozzle part 14. The first nozzle portion 11 is inserted and accommodated at intervals in the interior of the second nozzle, and the second nozzle is provided at intervals in the interior of the first nozzle portion 11, the center of the laser beam exit hole 16 is formed It is provided with a nozzle unit 13, is coupled to one end of the second nozzle unit 13 is connected to the body 15 and the body 15 to form a path for the laser beam is emitted laser oscillator 5 ) Is configured to include a bracket 17 is provided.

Here, the body 15 is provided with a coupling ring 70 having a ring shape having a threaded line formed on an inner circumferential surface at one end thereof, and the second nozzle portion 13 in the present embodiment is the coupling ring 70. A screw portion 13a having a screw line formed on an upper outer surface of the upper surface of the drawing is provided so as to be screwed in to move in a vertical direction.

In this configuration, when the second nozzle part 13 is rotated clockwise or counterclockwise, the screwing structure with the fastening ring 70 is used to move up or down based on the drawing. As a result, the distance from the first nozzle part 11 is adjusted.

That is, when the second nozzle part 13 is rotated in one direction and moved upward with respect to the coupling ring 70, the first nozzle part 11 facing the second nozzle part 13 is formed as shown in FIG. 11. As the size of the powder flow passage 25, which is an interval between the two, increases, the flow amount of the powder increases.

In summary, the second nozzle unit 13 is rotated in a clockwise or counterclockwise direction so that the fastening ring 70 can be lifted and lowered, and the first nozzle is moved by the lifting operation of the second nozzle unit 13. Since the distance from the part 11 becomes larger or smaller, it is possible to control the flow amount of the powder as a result, it is possible to control the supply of the powder in accordance with the material of the base material or coating or alloy conditions.

On the other hand, the action of the nozzle for the laser coating apparatus according to the present embodiment configured as described above for adjusting the size of the third nozzle portion 14 and the powder flow passage 25 for forming the air curtain hole (65) Except for the structure of the fastening ring 70 and the threaded portion (13a), the detailed description will be omitted because it is almost the same as the temporary example described above.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but that various changes and modifications may be made therein without departing from the spirit and scope of the invention. It is obvious to those who have knowledge. It is therefore intended that such variations and modifications fall within the scope of the appended claims.

1 nozzle for laser coating device 10 body
11: first nozzle part 13: second nozzle part
14: third nozzle unit 15: the body
16 laser beam exit hole 17 bracket
20: powder supply line 25: powder flow passage
30, 40: first and second cooling channel 50: purging gas supply line
60: air supply line 65: air curtain hole

Claims (5)

A body 10 having a laser beam exit hole 16 formed at a center thereof; A powder supply line 20 connected to one side of the body 10 to supply a mixture of carrier gas and metal powder and a purge gas supply connected to a position not interfering with the powder supply line 20 to supply a purging gas. Line 50; A powder flow passage 25 formed in the body 10 so as to be connected to the powder supply line 20 to receive a carrier gas and metal powder and to eject to one side of the laser beam exit hole 16; The first is connected to the purging gas supply line 50 is supplied through the purging gas is ejected through the laser beam exit hole 16, surrounding the outer surface of one side of the body 10, the cooling water is circulated supply from the outside In the nozzle for a laser metal coating apparatus composed of two cooling channels (30, 40),
The body 10 is provided in a conical shape in which the diameter is reduced while proceeding in the direction in which the laser beam is emitted, the first nozzle portion 11 having a space therein;
A second nozzle part 13 which is provided at intervals inside the first nozzle part 11 and has a laser beam exit hole 11 formed at a center thereof;
A bracket 17 coupled to the second nozzle unit 13 to form a body 15 through which a laser beam is emitted and a laser oscillator 5 connected thereto;
The first nozzle unit 11 receives air from the outside by a conical member that is inserted and received at intervals therein, and flows air between the first nozzle unit 11 and the air curtain around the ejected powder. A third nozzle portion 14 forming a hole 65,
The body 15 is provided with a coupling ring 70 having a screw line formed at an inner circumferential surface at one end thereof, and the second nozzle portion 13 is screwed to the coupling ring 70 to move a position in a vertical direction. The nozzle for laser metal coating apparatus further comprises a screw portion (13a) is provided to adjust the flow rate of the powder by adjusting the interval with the first nozzle portion (11).
The purge gas of claim 1, wherein the first nozzle part 11 is provided at one side thereof so that one end of the powder supply line 20 is connected therein, and the purge gas is supplied to one side of the body 15. One end of the supply line 50 is provided with a nozzle for a laser coating apparatus, characterized in that it is provided to be connected to the inside.
The method of claim 1, wherein the first cooling channel 30 is provided to surround one side of the body close to the exit from which the laser beam is emitted, the second cooling channel 40 is adjacent to the laser oscillator (5) Nozzle for laser coating device, characterized in that provided to surround one side of the body.
delete The 'C' shaped air curtain hole (65) according to claim 1, wherein the 'C' shaped air curtain (65) forms an 'C' shaped air curtain so that residual powder and carrier gas are discharged to the rear end side with respect to the welding progress direction of the third nozzle portion (14). A nozzle for laser metal coating apparatus, characterized in that is formed.

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