KR20120025195A - Cutting apparatus with laser - Google Patents

Cutting apparatus with laser Download PDF

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Publication number
KR20120025195A
KR20120025195A KR1020100087425A KR20100087425A KR20120025195A KR 20120025195 A KR20120025195 A KR 20120025195A KR 1020100087425 A KR1020100087425 A KR 1020100087425A KR 20100087425 A KR20100087425 A KR 20100087425A KR 20120025195 A KR20120025195 A KR 20120025195A
Authority
KR
South Korea
Prior art keywords
laser
protective gas
nozzle
laser nozzle
cutting device
Prior art date
Application number
KR1020100087425A
Other languages
Korean (ko)
Inventor
이병국
Original Assignee
(주)로파
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by (주)로파 filed Critical (주)로파
Priority to KR1020100087425A priority Critical patent/KR20120025195A/en
Publication of KR20120025195A publication Critical patent/KR20120025195A/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/36—Removing material
    • B23K26/38—Removing material by boring or cutting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
    • B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
    • B23K26/064—Shaping the laser beam, e.g. by masks or multi-focusing by means of optical elements, e.g. lenses, mirrors or prisms
    • B23K26/0648—Shaping the laser beam, e.g. by masks or multi-focusing by means of optical elements, e.g. lenses, mirrors or prisms comprising lenses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/14—Working by laser beam, e.g. welding, cutting or boring using a fluid stream, e.g. a jet of gas, in conjunction with the laser beam; Nozzles therefor
    • B23K26/1462—Nozzles; Features related to nozzles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/70—Auxiliary operations or equipment
    • B23K26/702—Auxiliary equipment
    • B23K26/703—Cooling arrangements

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
  • Laser Beam Processing (AREA)

Abstract

PURPOSE: A laser cutting machine is provided to effectively discharge foreign materials entering through a beam hole of a laser nozzle by supplying inactive gas at a fixed pressure through a protective gas inlet. CONSTITUTION: A laser cutting machine comprises a beam generator(201), an optical part(210), and a laser nozzle(203). The beam generator emits a laser beam. The optical part changes the size and shape of the laser beam. The laser nozzle is arranged under the optical part and has a beam hole(203a) that allows the laser beam passing through the optical part to pass. A protective gas inlet(203b) is arranged on one side of the laser nozzle and supplies protective gas at a fixed pressure into the laser nozzle.

Description

Laser cutting device {Cutting apparatus with laser}

The present invention relates to a laser nozzle mounted on a laser cutting device, and more particularly, to a laser cutting device equipped with a laser nozzle for preventing foreign matter from penetrating into the laser nozzle and cooling the lens at the same time.

In general, in cutting brittle materials such as glass, wafers, and ceramics using a laser, the laser is the method of performing high quality clean processing while minimizing residual thermal stress caused by dust or thermal shock generated during laser processing. Laser thermocleaving is widely used.

The basic principle of the laser thermal cutting method is to cut the material without loss of material by maximizing the expansion / compression force inside the brittle material by heating and cooling the brittle material below the softening point. The cutting can be performed only by heating.

1 is a perspective view of a conventional laser cutting device. As shown in FIG. 1, the conventional laser cutting device includes a beam generator 101 for emitting a laser beam, a reflector 102 for changing the direction of the laser beam irradiated from the beam generator 101, and The laser beam passing through the optical unit 110 for transmitting the laser beam diverted by the reflector 102 to focus the laser beam passes through the working gas hole 113 in the lens holder 112 and nitrogen and The brittle material 104 is cut on the stage (not shown) and is moved at a constant speed, including a laser nozzle having a beam hole by supplying oxygen at a high pressure.

Here, the optical unit 110 for focusing the laser beam is installed to have the same axis as the traveling direction of the laser beam reflected and reflected downward by the reflector 102, the cylindrical is installed on the upper end of the cylindrical lens holder 112 The lens 111 is integrally installed

The beam was focused and irradiated to the workpiece together with the gas supplied through the working gas hole 113 to process the brittle material.

Cutting with a laser has been widely used in industry since the invention of the laser. In this method, the laser beam is focused in a circular shape to melt and vaporize the material to remove the material, and the cutting process is performed using the laser nozzle to protect the optical part and remove the molten material.

The new laser nozzle transforms the laser beam into an ellipse shape to heat the material. The elliptical beam has a short axis of several mm and a long axis of several tens of mm.

LCD glass is made of double glazed glass, and for mass production process, it is necessary to irradiate the laser beam from up and down, and also the liquid which can cool the laser beam is sprayed up and down, preventing damage to the optical part and concentrating to cool the heated lens. Invented the present laser nozzle.

In the process of cutting the brittle material using a conventional laser cutting device, the laser beam generated by the beam generating unit 101 is the beam hole 103a of the reflector 102, the optical unit 110 and the laser nozzle 103 ) Is finally irradiated onto the surface of the brittle material which is finally placed on the stage and moves at a constant speed to cut the brittle material. At this time, the dust or foreign matter of the brittle material is generated to generate the beam of the laser nozzle 103 There is a possibility that the foreign matter or the like is introduced into the laser nozzle 103 through the hole 103a.

When the foreign matter is introduced into the laser nozzle 103, problems such as the focal point of the laser beam having a circular cross section formed of the optical unit 111 may be blurred, and thus, the cutting of the brittle material cannot be secured.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a laser cutting device that can prevent foreign matter from penetrating into the laser nozzle and provides a function to cool the heated lens.

Laser cutting device according to the present invention for achieving the above object is a beam generating unit for emitting a laser beam; and, an optical unit that serves to modify the size and shape of the laser beam; and at the lower end of the optical unit And a laser nozzle having a beam hole through which a laser beam passing through the optical part passes, and a protective gas inlet port provided at one side of the laser nozzle to supply a protective gas having a predetermined pressure into the laser nozzle. Characterized in that made.

Preferably, the optical portion includes a cylindrical lens and a condenser lens as a means for forming an elliptical beam.

Preferably, the beam hole has a straight shape.

Preferably, the protective gas inlet of the laser nozzle is connected to the protective gas supply pipe, the protective gas supply pipe is connected to the protective gas supply pump.

The laser cutting device according to the present invention has the following effects.

As a protective gas inlet for supplying an inert gas such as nitrogen or clean air at a predetermined pressure is provided at one side of the laser nozzle, foreign substances penetrating through the beam hole of the laser nozzle through which the laser beam passing through the condenser lens of the optical unit passes. It is possible to effectively discharge the back.

In addition, the gas having a predetermined pressure supplied through the protective gas inlet is discharged toward the surface of the cutting material through the beam hole, thereby obtaining the effect of cooling the cutting material with the progress of the cutting process. This eliminates the need for a separate cooler as in the prior art.

1 is a perspective view of a laser cutting device according to the prior art.
2 is a perspective view of a laser cutting device according to the present invention.
3A to 3C are reference diagrams for explaining the geometric correlation in the laser cutting device according to the present invention.

According to a feature of the present invention, by providing a protective gas inlet for supplying an inert gas such as nitrogen or clean air at a predetermined pressure on one side of the laser nozzle, the laser nozzle passing through the condensing lens of the optical unit passes through It is possible to effectively discharge the foreign matter penetrated through the beam hole, and has a function of cooling the lens is heated the gas having a predetermined pressure supplied through the protective gas inlet.

Hereinafter, a laser cutting device according to the present invention will be described in detail with reference to the drawings. 2 is a perspective view of a laser cutting device according to the present invention, Figures 3a to 3c is a reference diagram for explaining the geometrical correlation in the laser cutting device according to the present invention.

First, as shown in FIG. 2, the laser cutting device according to the present invention is largely composed of a beam generator 201, an optical unit 210, and a laser nozzle 203. The beam generator 201 serves to generate a laser beam, and at least one reflector 202 may be provided between the beam generator 201 and the optical unit 210.

The optical unit 210 has body parts called lens holders 1 and 2 (212 and 214), and a cylindrical lens 211 and a condensing lens 213 in the lens holders 1 and 2 (212 and 214). It is equipped with a spherical lens. The laser beams coming out through the two lenses are irradiated with an elliptical shape. To cut brittle materials, the straight beam can be cut and the CYLINDRICAL LENS mounted on the lens holder 2 (214) can be rotated to match the cutting line. There is a rotation function.

Although the laser nozzle 203 serves as a primary foreign matter blocking role for preventing the foreign matter from penetrating into the optical unit 210, as described in the problems of the prior art, the laser nozzle ( A phenomenon that foreign matter penetrates into the laser nozzle 203 through the beam hole 203a provided at the bottom thereof is generated.

In the present invention, as a means for solving such a problem, a protective gas inlet 203b is provided at one side of the laser nozzle 203. The protective gas inlet 203b is connected to a predetermined protective gas supply pipe (not shown), and has a predetermined pressure, for example, nitrogen or air, into the laser nozzle 203 through the protective gas inlet 203b. Inert gases such as may be supplied. Here, the protective gas may be supplied from a protective gas supply pump (not shown) connected to the protective gas supply pipe.

As the inert gas having a predetermined pressure is supplied into the laser nozzle 203 through the protective gas inlet 203b, the foreign matter penetrated through the beam hole 203a is again flowed back by the inert gas and thus the beam hole 203a. ) It is discharged to the outside. That is, the beam hole 203a simultaneously plays a role of not only the passage of the laser beam but also the outlet of the foreign matter. In addition, as the gas of a predetermined pressure is supplied through the protective gas inlet 203b and the corresponding gas is discharged through the beam hole 203a, the cutting material 204 that is the lower portion of the beam hole 203a, that is, brittle material is removed. With the progress of the cutting process, the cooling effect can be obtained, so that a separate cooler does not need to be necessarily provided as in the related art.

The beam hole 203a is formed in a straight line to pass a laser beam having an elliptical cross section. The geometric size of the beam hole 203a is determined in consideration of the following correlation.

First, referring to FIG. 3A, the length A in the Y-axis direction of the beam hole 203a is related to the length D of the laser beam, and the length B in the X-axis direction of the beam hole 203a. ) Is related to the width C of the laser beam. Specifically, referring to FIG. 3B, the focal length F2 by the combination of the cylindrical lens 211 and the condenser lens 213 in the X-axis direction is calculated by the following formula for calculating the effective focal length of Equation 1 below. The calculated focal length F2 is used to determine the distance E between the laser nozzle 203 and the optical unit 210.

(Equation 1)

1 / f = 1 / f 1 + 1 / f 2 + ... + 1 / f n

In Equation 1, f is an effective focal length by a combination of thin lenses, and fn is a focal length of each lens.

Next, referring to FIG. 3C, the focal length F1 is determined by the condenser lens 213 in the Y-axis direction, and the length A-axis length A of the beam hole 203a is determined by the calculated focal length F1. Is determined.

As the flow rate of the gas increases in proportion to the area of the beam hole 203a and the pressure inside the laser nozzle 203 is inversely proportional, the gas supplied to the protective gas inlet 203b according to the geometric size of the beam hole 203a. Pressure is determined.

In consideration of such a determination condition of the size of the beam hole 203a, as an embodiment of the present invention, a laser cutting apparatus having the following specific values is presented.

An optical unit 210 composed of a cylindrical lens 211 having a focal length of 50 mm and a condensing lens 213 having a focal length of 190 mm is formed to pass through the condensing lens 213 and finally on the surface of the cutting material 204. The elliptical beam irradiated to the short axis (C) 2mm, the long axis (D) 50mm is formed.

In addition, the beam hole 203a of the laser nozzle 203 through which the laser beam transmitted through the condenser lens 213 passes is processed to have an X-axis length A of 2 mm and a Y-axis length B of 16 mm. In this state, the preferred pressure of the gas supplied to the protective gas inlet 203b of the laser nozzle 203 is about 4 bar.

201: beam generator 202: reflector
203: laser nozzle 203a: beam hole
203b: protective gas inlet 210: optical part
211: cylindrical lens 212: first lens holder
213: condenser lens 214: second lens holder

Claims (5)

A beam generator for emitting a laser beam;
An optical unit which serves to modify the size and shape of the laser beam;
A laser nozzle provided at a lower end of the optical part and having a beam hole through which a laser beam passing through the optical part passes;
And a protective gas inlet provided at one side of the laser nozzle to supply a protective gas having a predetermined pressure into the laser nozzle.
The method of claim 1,
And the optical unit comprises a cylindrical lens and a condenser lens as means for forming an elliptical beam.
The method of claim 1,
The beam hole is a laser cutting device, characterized in that having a straight shape.
The method of claim 1,
The laser gas cutting device, characterized in that the protective gas inlet is connected to the protective gas supply pipe, the protective gas supply pipe is connected to the protective gas supply pump.
The laser cutting device of claim 1, wherein the laser nozzle is rotatable.
KR1020100087425A 2010-09-07 2010-09-07 Cutting apparatus with laser KR20120025195A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020100087425A KR20120025195A (en) 2010-09-07 2010-09-07 Cutting apparatus with laser

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020100087425A KR20120025195A (en) 2010-09-07 2010-09-07 Cutting apparatus with laser

Publications (1)

Publication Number Publication Date
KR20120025195A true KR20120025195A (en) 2012-03-15

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KR1020100087425A KR20120025195A (en) 2010-09-07 2010-09-07 Cutting apparatus with laser

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110039176A (en) * 2019-05-08 2019-07-23 温岭市豪基机床附件有限公司 A kind of laser cutter residue cleaning plant

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110039176A (en) * 2019-05-08 2019-07-23 温岭市豪基机床附件有限公司 A kind of laser cutter residue cleaning plant
CN110039176B (en) * 2019-05-08 2020-10-16 温岭市豪基机床附件有限公司 Residue cleaning device for laser cutter

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