KR101781332B1 - Laser Cladding Head - Google Patents

Laser Cladding Head Download PDF

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Publication number
KR101781332B1
KR101781332B1 KR1020160027587A KR20160027587A KR101781332B1 KR 101781332 B1 KR101781332 B1 KR 101781332B1 KR 1020160027587 A KR1020160027587 A KR 1020160027587A KR 20160027587 A KR20160027587 A KR 20160027587A KR 101781332 B1 KR101781332 B1 KR 101781332B1
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KR
South Korea
Prior art keywords
cooling
water
air
cylinder
housing
Prior art date
Application number
KR1020160027587A
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Korean (ko)
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KR20170104770A (en
Inventor
신인승
박형석
Original Assignee
에스아이에스 주식회사
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Priority to KR1020160027587A priority Critical patent/KR101781332B1/en
Publication of KR20170104770A publication Critical patent/KR20170104770A/en
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Publication of KR101781332B1 publication Critical patent/KR101781332B1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/02—Constructional details
    • H01S3/04—Arrangements for thermal management
    • H01S3/0407—Liquid cooling, e.g. by water
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/02—Constructional details
    • H01S3/04—Arrangements for thermal management
    • H01S3/0405—Conductive cooling, e.g. by heat sinks or thermo-electric elements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/20—Structure or shape of the semiconductor body to guide the optical wave ; Confining structures perpendicular to the optical axis, e.g. index or gain guiding, stripe geometry, broad area lasers, gain tailoring, transverse or lateral reflectors, special cladding structures, MQW barrier reflection layers

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Geometry (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Laser Beam Processing (AREA)

Abstract

The present invention relates to a laser cladding head detachably attached to a general laser welding head and capable of continuously irradiating a high output beam with a laser welding head and reducing work stoppage time due to overheating, A housing for accommodating therein a laser beam irradiated from a head; A water-cooling unit including a water-cooling cylinder circumscribing the housing and a water-cooling pin protruding from an outer circumferential surface of the water-cooling cylinder; Cooling cylinder having a length larger than that of the water-cooling cylinder so that an inflow / outflow space is formed at the upper and lower portions of the cavity, the air-cooling cylinder protruding from the outer circumferential surface of the air- An air inlet formed in the air-cooled cylinder so that cooling water flows into the air outlet, and an air outlet formed in the air-cooled cylinder to discharge the cooling water into the outlet space; And a nozzle unit for supplying powder metal and a protective gas in a state of surrounding a lower portion of the laser beam protruded from the housing, wherein the water-cooling fin has a plurality of heat-radiating fins radially protruding from the outer circumferential surface of the water- Each of the radiating fins is provided as a straight line, and the end of the radiating fin is in contact with the air-cooled portion.

Description

[Technical Field] The present invention relates to a laser cladding head,

The present invention relates to a laser cladding head, and more particularly, to a laser cladding head, which is detachably attached to a general laser welding head and which is capable of continuously irradiating a high output beam, To a laser cladding head.

3D printing technology is a technology to form a desired three-dimensional shape material by laminating liquid or powder type polymer or powder metal material according to design data, and is now forming a market and attracting attention as a next generation major manufacturing technology.

Almost all materials are used for polymers, but aluminum, titanium, and stainless steel are limited in the early stages of powder metal materials.

Generally, a laser beam is used for a three-dimensional printing technique using powder metal. The powder metal is fed, welded and sintered to the end of the laser beam focused by the laser welding head.

However, in a conventional laser welding head in which a water cooling means is provided inside due to the characteristics of a high-power laser beam to be irradiated for a long time, the cooling is insufficient and there is a limit to increase the laser output. In addition, There is a problem that the speed of molding work is lowered.

KR 10-2015-0139216 A 2015.12.11.

A problem to be solved by the present invention is to provide a laser cladding head which is attached to a general laser welding head to continuously irradiate a high output beam or shorten a work stoppage time for cooling.

According to an aspect of the present invention, there is provided a laser cladding head including: a housing accommodating therein a laser beam emitted from a laser welding head; A water-cooling unit including a water-cooling cylinder circumscribing the housing and a water-cooling pin protruding from an outer circumferential surface of the water-cooling cylinder; Cooling cylinder having a length larger than that of the water-cooling cylinder so that an inflow / outflow space is formed at the upper and lower portions of the cavity, the air-cooling cylinder protruding from the outer circumferential surface of the air- An air inlet formed in the air-cooled cylinder so that cooling water flows into the air outlet, and an air outlet formed in the air-cooled cylinder to discharge the cooling water into the outlet space; And a nozzle unit for supplying powder metal and a protective gas in a state of surrounding a lower portion of the laser beam protruded from the housing, wherein the water-cooling fin has a plurality of heat-radiating fins radially protruding from the outer circumferential surface of the water- Each of the radiating fins is provided as a straight line, and the end of the radiating fin is in contact with the air-cooled portion.

Further, the laser cladding head of the present invention further comprises a cooling cylinder splitting means which is installed in the inflow space and has a support cylinder whose inner circumferential surface is in contact with the welding head and a plurality of guide pins protruding from the outer circumferential surface of the support cylinder, The guide pins are disposed on the same line as the lower ends of the radiating fins and are symmetrical with respect to the inlet holes. The guide pins are increased in height as the distance from the inlet holes increases.

In addition, the laser cladding head of the present invention further includes a shielding film on the outside of the air-cooled portion, and air is passed between the shielding film and the air-cooling pin.

According to the laser cladding head of the present invention, the laser welding head can continuously irradiate the high-power beam through the structure in which the end portions of the linear heat radiating fins contact the air cooling portion, and the work stopping time can be shortened, .

Further, according to the laser cladding head of the present invention, the cooling water flows smoothly through the guide pins whose upper ends are arranged on the same line above and below the lower ends of the radiating fins, thereby improving water cooling efficiency.

1 is a perspective view explaining a laser welding head and a cladding head according to the present invention.
2 is a cross-sectional perspective view illustrating a laser cladding head according to the present invention.
3 is an exploded perspective view showing a laser cladding head according to the present invention.
4 is a rear perspective view of a laser cladding head according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a perspective view illustrating a laser welding head and a laser cladding head according to the present invention in an exploded state, FIG. 2 is a perspective view showing a laser cladding head according to the present invention, FIG. Fig. 1, 2, and 3, the laser cladding head 1 of the present invention is detachably attached to a laser welding head 2 and includes a housing 10, a water-cooling unit (not shown) provided on the outer circumferential surface of the housing 10 An air cooling unit 30 which is spaced apart from the water cooling unit 20 so as to form a cavity S on the inside of the air cooling unit 30 and a nozzle unit 40 provided below the air cooling unit 30 Cooling the housing 10 with water cooling so as to continuously irradiate the laser beam with high output and shorten the work stoppage time for cooling.

The housing 10 is irradiated from the laser welding head 2 and receives the laser beam in the focusing process A to be protected from the outside air. And is made of a special steel material having a generally cylindrical shape and excellent in heat resistance since it is overheated by the heat of the cladding work proceeding from the lower part.

The water-cooling unit 20 includes a water-cooling cylinder 21 that is in contact with the housing 10 and a water-cooling pin 23 that protrudes from the outer circumferential surface of the water- ).

The water-cooled cylinder 21 has a shape corresponding to the outer circumferential surface of the housing 10 such that the inner circumferential surface thereof is in close contact with the outer circumferential surface of the housing 10, and the upper and lower lengths thereof are made shorter than the housing 10, So that the inflow / outflow spaces Si and So are formed when the housing 10 is fixed. The inflow / outflow space (Si, So) is for smooth inflow / outflow of cooling water and will be described in detail later.

The water-cooling fin 23 is configured to increase the cooling efficiency of the housing 10 by widening the contact area with the cooling water passing through the cavity S, and as shown in FIG. 3, a plurality of heat-radiating fins 23a The cooling fins 23a are radially protruded from the outer circumferential surface of the water-cooled cylinder 21 and each of the heat dissipation fins 23a is linearly arranged and the end portion a of the heat dissipation fins 23a is in contact with the air cooling portion 30 Respectively. As a result, the cooling efficiency of the housing 10 is maximized, which will be described in detail later.

The heat conducted to the water-cooling cylinder 21 in the housing 10 is partially cooled by the cooling water flowing in contact with the outer peripheral surface of the water-cooling cylinder 21 and the other is conducted to the water-cooling pin 23, The conduction heat is again cooled by the cooling water flowing in contact with the heat dissipating surface (b) of the water cooling pin 23 and the rest is cooled through the air cooling portion 30 through the end portion (a) of the water cooling fin 23 And is conducted to the cylinder 31.

On the other hand, the water-cooling cylinder 21 and the water-cooling fin 23 are usually made in one body. It is preferable to use an aluminum material which is easy to produce a complicated shape and has a high thermal conductivity because the shape is complicated.

The air-cooling unit 30 is configured to air-cool the heat conducted from the water-cooling pin 23 and is extrinsic to the water-cooling unit 20 and has an inner peripheral surface in contact with an end a of the water- Cooling cylinder 31 protruding from the outer circumferential surface of the air-cooling cylinder 31 and an air-cooling cylinder 31 corresponding to the inflow / outflow spaces Si and So, And a water pipe (not shown) is connected to the inlet hole 35 and the discharge hole 37 so that cooling water flows from the outside into the cavity (not shown) S).

The air cooling pin 33 expands the contact area with the surrounding air so as to co-heat the heat conducted from the end portion (a) of the water cooling pin 23 together with the air cooling cylinder 31. According to the heat conduction law, As the temperature difference is increased, the thermal conductivity is increased. By increasing the temperature difference between the inner circumferential surface of the water-cooling cylinder 21 and the end portion (a) of the water-cooling pin 23, the heat conduction amount of the water- Function.

However, since the water-cooling fin 23 interferes with the flow of the cooling water according to the arrangement, the water-cooling efficiency can be lowered. As described above, the cooling fins 23a are linearly arranged in a longitudinal direction, .

The air-cooling cylinder 31 and the air-cooling fin 33 are integrally formed of an aluminum material for the same reasons as those of the water-cooling cylinder 21 and the water-cooling fin 23, are exposed to the outside air and air- When the air is forcedly cooled, a shielding film (not shown) is provided outside the air-cooling unit 30 to maximize the air-cooling efficiency, and air is passed between the shielding film and the air-

The nozzle unit 40 is configured to supply the powdered metal and the protective gas to the lower portion of the laser beam protruding from the housing 10, (41) is formed in a radial direction, and a nozzle hole is formed at a lower end thereof to expose the laser beam end portion through the nozzle hole to perform the cladding operation.

Meanwhile, the cavity S has an annular cylindrical structure, but a section excluding the inflow / outflow spaces Si and So includes a plurality of partition walls (not shown) separated from each other by a water-cooling pin 23 contacting the inner circumferential surface of the air- A part of the partition space Sf does not flow smoothly into the partition space Sf according to the positional relationship between the position of the inlet hole 35 and the partition space Sf, have.

In order to solve such a problem, it is possible to consider installing a plurality of inflow holes 35 on the outer circumferential surface of the air-cooling cylinder 31, but the installation thereof can be troublesome. As shown in FIGS. 3 and 4, (Si, So) located at the most distant position in the cavity (S), while the cooling water distributing means (50) and the discharge hole (37) ) Is further provided.

The cooling water dividing means 50 includes a support cylinder 51 installed in the inflow space Si and having an inner circumferential surface in contact with the housing 10 and a plurality of guide pins 53 projected radially from the outer circumferential surface of the support cylinder 51 ).

The upper end 53a of the guide pin 53 is arranged on the upper side and the lower side of the lower end 23c of the radiating fin 23a in a symmetrical manner with respect to the inflow hole 35, And the upper and lower lengths h thereof are increased to the lower side as the distance from the lower side increases.

Therefore, the cooling water flowing through the inlet hole 35 and having a horizontal flow collides with the guide pins 53, and flows to the upper part, so that the cooling water flows smoothly into the respective partition spaces Sf located above. In addition, the cooling water passing through the partition space Sf due to the collision with the guide pin 53 has a turbulent behavior, so that the frequency of contact of the cooling water on the heat dissipating surface b of the water cooling pin 23 is increased and the cooling efficiency is improved.

The cooling water dividing means 50 may be integrally formed with the lower end of the water-cooling unit 20 so that the upper end of the cooling water dividing unit 50 is connected to the lower end of the water-

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

10: Housing
20: water-cooled part
21: water-cooling cylinder 23: water-cooling pin
30: air cooling part
31: air cooling cylinder 33: air cooling pin
35: Inlet hole 37: Discharge hole
40:
41: pipe connector
50: cooling water classifying means
51: support cylinder 53: guide pin

Claims (3)

A housing 10 for accommodating therein a laser beam irradiated from the laser welding head 2;
A water-cooling unit 20 comprising a water-cooling cylinder 21 which is in contact with the housing 10 and a water-cooling pin 23 which is protruded from the outer circumferential surface of the water-cooling cylinder 21;
Cooling cylinder 21 so as to form an inflow / outflow space Si and So on the upper and lower sides of the cavity S so as to form a cavity S on the inside of the cavity S, A cooling air inlet port 35 formed in the air-cooling cylinder 31 so as to allow cooling water to flow into the inlet space Si, a long air-cooling cylinder 31, a cooling air pin 33 protruding from the outer circumferential surface of the air- And a discharge hole (37) formed in the air-cooling cylinder (31) so as to discharge the cooling water to the outflow space (So); And
A nozzle unit 40 for supplying a powdered metal and a protective gas in a state surrounding a lower portion of the laser beam protruding from the housing 10;
/ RTI >
The water-cooling fin 23 has a plurality of heat-radiating fins 23a radially protruding from the outer circumferential surface of the water-cooling cylinder 21, and the heat-radiating fins 23a are linearly arranged in a longitudinal direction, Is in contact with the air cooling portion 30,
Wherein a shielding film is further provided on the outer side of the air cooling part (30), and air is passed between the shielding film and the air cooling fin (33).
The method according to claim 1,
A cooling water separating means 50 (hereinafter, referred to as "cooling water separating means") 50 comprising a supporting cylinder 51 provided in the inflow space Si and having an inner peripheral surface in contact with the housing 10 and a plurality of guide pins 53 protruding from the outer circumferential surface of the supporting cylinder 51 Further,
The upper end 53a of the guide pin 53 is disposed on the same line as the lower end 23c of the radiating fin 23a and is symmetrical with respect to the inflow hole 35, And the upper and lower lengths (h) of the laser cladding are increased downward.
delete
KR1020160027587A 2016-03-08 2016-03-08 Laser Cladding Head KR101781332B1 (en)

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Application Number Priority Date Filing Date Title
KR1020160027587A KR101781332B1 (en) 2016-03-08 2016-03-08 Laser Cladding Head

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Application Number Priority Date Filing Date Title
KR1020160027587A KR101781332B1 (en) 2016-03-08 2016-03-08 Laser Cladding Head

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KR20170104770A KR20170104770A (en) 2017-09-18
KR101781332B1 true KR101781332B1 (en) 2017-09-25

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102228075B1 (en) 2020-12-16 2021-03-12 김유정 Laser processing head assembly

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112064016B (en) * 2020-09-22 2022-11-15 安徽中科春谷激光产业技术研究院有限公司 Laser cladding gas protection device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101643900A (en) * 2008-08-06 2010-02-10 沈阳新松机器人自动化股份有限公司 Air curtain type three-dimensional coaxial laser feeding head

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101643900A (en) * 2008-08-06 2010-02-10 沈阳新松机器人自动化股份有限公司 Air curtain type three-dimensional coaxial laser feeding head

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102228075B1 (en) 2020-12-16 2021-03-12 김유정 Laser processing head assembly

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