JPWO2010123068A1 - Laser processing apparatus and laser processing method - Google Patents

Abstract

Ensure the quality of the workpiece after processing. The laser processing device (10) divides the laser beam (L1) into a first laser beam (L1) and a second laser beam (L2). A beam splitter (20), and a first lens (22) for emitting a first laser beam (L1) toward a part of the processing object (30) so that the processing object (30) is cut. The second laser beam (L2) is burred so that the burrs (32, 34) formed on the workpiece (30) are smoothed as the workpiece (30) is cut. 32, 34) and a total reflection mirror (24), a second lens (26), and a galvanometer mirror (28). Even if burrs (32, 34) are formed on the processing object (30) as the processing object (30) is cut, the burrs (32, 34) are formed by the second laser beam (L2). Since it can be made smooth, the quality after a process of a process target object (30) can be ensured.

Description

  The present invention relates to a laser processing apparatus and a laser processing method.

  Conventionally, there are the following laser processing apparatuses and laser processing methods (for example, see Non-Patent Documents 1 to 3). That is, Non-Patent Documents 1 to 3 disclose examples in which a laser beam is irradiated on a workpiece and the workpiece is cut.

Patent Document 4 discloses a laser processing apparatus that processes a workpiece with two laser beams.
International Congress on Applications of Lasers & Electro-Optics (ICALEO), 2008, Congress Proceedings, Laser Microprocessing Conference Page 320 of 430, LASER CUTTING FOR MEDICAL DEVICE (STENT)-YESTERDAY, TODAY AND TOMORROW International Congress on Applications of Lasers & Electro-Optics (ICALEO), 2008, Congress Proceedings, Laser Materials Processing Conference Page 582 of 909, FLEXIBLE 3-D-LASER CUTTING AND WELDING WITH THE COMBI-HEAD International Congress on Applications of Lasers & Electro-Optics (ICALEO), 2008, Congress Proceedings, Laser Materials Processing Conference Page 695 of 909, REMOTE-CUTTING-A SMART SOLUTION USING THE ADVANTAGES OF HIGH BRIGHTNESS LASERS JP 2008-114276 A JP 2008-114458 A JP-A-2005-231172 Japanese Patent No. 2604395 JP 2008-114276 A JP 2006-297464 A

  In the laser processing apparatus and the laser processing method described above, there is a problem that burrs are formed on the processing target as the processing target is cut and the quality of the processing target after processing is reduced.

  This invention is made | formed in view of the said subject, Comprising: It aims at providing the laser processing apparatus and laser processing method which can ensure the quality after the process of a workpiece.

  Moreover, when a thin plate material is cut using the above-described laser processing apparatus, it is desired that the surface roughness after processing is small.

  This invention is made | formed in view of the said subject, Comprising: It aims at providing the laser processing apparatus which can make the surface roughness after a process small.

  In order to solve the above problem, a laser processing apparatus according to claim 1, a laser oscillation unit that oscillates laser light, a laser beam oscillated from the laser oscillation unit, a first laser beam, and a second laser beam. A first splitting unit that splits the laser beam into a part of the workpiece, and a first emitting unit that emits the first laser beam toward a part of the workpiece, A second emitting unit that emits the second laser light toward the burr so that the burr formed on the workpiece is melted as part of the workpiece is removed; It has.

  In this laser processing apparatus, when a laser beam is oscillated from the laser oscillation unit, the laser beam is divided into a first laser beam and a second laser beam by the spectroscopic unit. Then, a part of the processing object is removed by irradiating a part of the processing object with the first laser light emitted from the first emitting part.

  Here, when a part of the workpiece is removed as described above, a burr is formed on the workpiece.

  However, in this laser processing apparatus, the burr is melted by irradiating the burr with the second laser light emitted from the second emission part.

  Thus, according to this laser processing apparatus, even if burrs are formed on the workpiece as part of the workpiece is removed, the burrs can be melted by the second laser beam. Therefore, the quality of the processed object after processing can be ensured.

  The laser processing apparatus according to claim 2 is the laser processing apparatus according to claim 1, wherein the spectroscopic unit is configured so that the first laser beam has a larger amount of light than the second laser beam. The laser light is divided.

  In order to remove a part of the processing object, a large amount of the first laser light is necessary. On the other hand, a small amount of the second laser light is sufficient to melt the burr.

  In this regard, according to this laser processing apparatus, the first laser beam has a larger amount of light than the second laser beam, and thus the first laser beam is formed on the workpiece while removing a part of the workpiece. The burr can be melted (a part of the workpiece can be removed and the burr can be melted).

  The laser processing apparatus according to claim 3 is the laser processing apparatus according to claim 1 or 2, wherein the second emitting portion is directed toward the burr formed on the front side and the back side of the workpiece. The same second laser beam is emitted.

  According to this laser processing apparatus, even when burrs are formed on the front side and the back side of the workpiece, these burrs are melted by irradiating these burrs with the same second laser light. Can do. Therefore, for example, the configuration of the apparatus can be simplified as compared with a configuration in which the second laser light is divided into a plurality of parts and each burr is irradiated with each different second laser light.

  The laser processing apparatus according to claim 4 is the laser processing apparatus according to claim 1 or 2, wherein the second emission unit divides the second laser light into a plurality of parts and the front side of the object to be processed. And the second laser light different from each other toward the burr formed on the back side.

  According to this laser processing apparatus, even when burrs are respectively formed on the front side and the back side of the workpiece, the second laser light is divided into a plurality of parts, and the different second laser lights are respectively applied to the burrs. By irradiating, each burr can be melted. Therefore, for example, each burr can be melted more effectively as compared with a configuration in which the same second laser light is irradiated to each burr without dividing the second laser light into a plurality of parts.

  In order to solve the above problem, the laser processing method according to claim 5, wherein the laser beam oscillated from a laser oscillator is divided into a first laser beam and a second laser beam, and A part of the processing object is removed by irradiating a part of the processing object with the first laser beam, and formed on the processing object as a part of the processing object is removed. In this method, the burrs are melted by irradiating the burrs with the second laser beam.

  According to this laser processing method, even if burrs are formed on the workpiece due to the removal of a part of the workpiece, the burrs are melted by the second laser beam. Quality after processing can be ensured.

  The laser processing method according to claim 6 is the laser processing method according to claim 5, wherein the first laser beam is divided so that the amount of light is larger than that of the first laser beam. It is a method to do.

  In order to remove a part of the processing object, a large amount of the first laser light is necessary. On the other hand, a small amount of the second laser light is sufficient to melt the burr.

  In this regard, according to this laser processing method, the first laser beam has a larger amount of light than the second laser beam, so that a part of the processing object is removed and formed on the processing object. The burr can be melted (a part of the workpiece can be removed and the burr can be melted).

  The laser processing method according to claim 7 is the laser processing method according to claim 5 or 6, wherein the second laser beam is the same as the burr formed on the front side and the back side of the workpiece. Is used to melt the burrs.

  According to this laser processing method, even when burrs are formed on the front side and the back side of the workpiece, these burrs are melted by irradiating these burrs with the same second laser light. Therefore, for example, the configuration of the laser processing apparatus used in this method is compared with, for example, the case where the second laser light is divided into a plurality of parts and each second burr is irradiated with each different burr. It can be simplified.

  The laser processing method according to claim 8 is the laser processing method according to claim 5 or 6, wherein the second laser light is divided into a plurality of parts and formed on the front side and the back side of the workpiece. In this method, the burrs are melted by irradiating the second burrs with different second laser beams.

  According to this laser processing method, even when burrs are formed on the front side and the back side of the workpiece, the second laser beam is divided into a plurality of parts, and the different second laser beams are applied to the respective burrs. By irradiation, each burr is melted. Therefore, for example, each burr can be melted more effectively than when the same second laser light is irradiated to each burr without dividing the second laser light into a plurality of parts.

  In order to solve the above problem, the laser processing apparatus according to claim 9 is a laser processing apparatus for cutting a thin plate material having a thickness of 100 μm or less, wherein the first laser is applied to the thin plate material. A laser irradiation unit that irradiates light and irradiates the thin plate member with a second laser beam having a spot size larger than the first laser beam following the first laser beam. It has.

  According to this laser processing apparatus, since the thin plate material is irradiated with the second laser light having a spot size larger than the first laser light following the first laser light, the first laser light is applied to the thin plate material. The burrs formed on the thin plate material by irradiation can be melted by the second laser beam. Thereby, the surface roughness after a process can be made small.

  The laser processing apparatus according to claim 10 is the laser processing apparatus according to claim 9, wherein the laser irradiation unit applies the first laser beam and the second laser beam having different wavelengths to the thin plate material. It is set as the structure which irradiates.

  According to this laser processing apparatus, by irradiating the thin plate material with the first laser beam and the second laser beam having different wavelengths, the first laser beam forms an oxidation reforming portion on the thin plate material, The thin plate material can be cut while removing the oxidation modified portion by the second laser beam. Thereby, the surface roughness after a process can be made still smaller.

  The laser processing apparatus according to claim 11 is the laser processing apparatus according to claim 9 or 10, wherein the laser irradiation unit includes the first laser beam and the second laser of a pulse wave or a continuous wave. A single light source that oscillates light, a first emission part that emits the first laser light oscillated from the light source toward the thin plate member, and the second laser light oscillated from the light source. And a second emitting portion that emits toward the thin plate material.

  According to this laser processing apparatus, since a single light source that oscillates the first laser light and the second laser light is used, the cost of the apparatus can be reduced.

  Further, when the light source oscillates the first laser beam and the second laser beam in the pulse wave, the pulse interval between the first laser beam and the second laser beam can be adjusted optimally. The surface roughness can be obtained.

  On the other hand, when the light source oscillates the first laser beam and the second laser beam of continuous waves, a desired surface roughness can be obtained continuously.

  The laser processing apparatus according to claim 12 is the laser processing apparatus according to any one of claims 9 to 11, wherein the laser irradiation unit irradiates the first plate with the first laser beam. Thus, the second laser beam is irradiated to the burr so that the burr formed on the thin plate material is melted.

  According to this laser processing apparatus, the first laser beam is irradiated onto the thin plate material, whereby the burr formed on the thin plate material can be melted by the second laser beam.

  In order to solve the above problem, the laser processing apparatus according to claim 13 includes at least one laser oscillating unit that oscillates laser light and at least two lasers oscillated from the laser oscillating unit. A laser processing apparatus including a laser irradiation unit configured to irradiate light following a workpiece, and the laser irradiation unit oxidizes and reforms the workpiece by a first laser beam irradiated first. The processing object is cut by forming a portion and removing the oxidation reforming portion.

  According to this laser processing apparatus, by irradiating the thin plate material with the first laser beam and the second laser beam having different wavelengths, the first laser beam forms an oxidation reforming portion on the thin plate material, The thin plate material can be cut while removing the oxidation modified portion by the second laser beam.

  The laser processing device according to claim 14 is the laser processing device according to claim 13, wherein the laser irradiation unit has a wavelength of the first laser beam irradiated first and a laser beam irradiated second and later. The wavelength is different.

  The laser processing apparatus according to claim 15 is the laser processing apparatus according to claim 14, wherein the laser irradiation unit has a higher heat absorption rate with respect to the thin plate material than the second laser light. It is set as the structure which irradiates the said laser beam to the said thin-plate material.

  According to this laser processing apparatus, the oxidation modified portion can be formed on the thin plate material by the first laser beam.

  A laser processing apparatus according to a sixteenth aspect is the laser processing apparatus according to the thirteenth aspect, wherein the number of the laser oscillation units is the same as the number of types of wavelengths of the laser light to be irradiated.

  A laser processing apparatus according to a seventeenth aspect is the laser processing apparatus according to the thirteenth aspect, wherein the object to be processed is temperature-controlled in order to increase the absorption rate of the irradiated laser beam. .

  The laser processing apparatus according to claim 18 is the laser processing apparatus according to claim 17, wherein the object to be processed has a temperature controlled by its material.

  A laser processing apparatus according to a nineteenth aspect is the laser processing apparatus according to the thirteenth aspect, further comprising a spectroscopic unit that divides the laser beam oscillated from the laser oscillation unit into a plurality of laser beams.

  As described above in detail, according to the present invention, even if a burr is formed on the workpiece by removing a part of the workpiece, the burr is melted by the second laser beam. The quality of the processed object after processing can be ensured.

  Moreover, as detailed above, according to the present invention, the surface roughness after processing can be reduced.

It is a figure which shows the structure of the laser processing apparatus which concerns on 1st embodiment of this invention. It is a perspective view which shows the relative position of the 1st laser beam shown by FIG. 1, a 2nd laser beam, and a process target object. It is a figure which shows the structure of the laser processing apparatus which concerns on 2nd embodiment of this invention. It is a perspective view which shows the relative position of the 1st laser beam shown by FIG. 3, a 2nd laser beam, and a process target object. It is a figure which shows the whole structure of the laser processing apparatus which concerns on 3rd embodiment of this invention. It is a figure which compares the shape and spot size of the 1st laser beam and the 2nd laser beam which were irradiated on the surface of the thin board | plate material shown by FIG. FIG. 6 is a cross-sectional view of the thin plate material shown in FIG. 5, showing an oxidation reforming portion formed on the thin plate material. It is the figure which showed the relationship between a heat absorption rate and the wavelength of light for every material of a thin-plate material. It is a figure regarding 3rd embodiment of this invention. It is a figure regarding 3rd embodiment of this invention. It is a figure regarding 3rd embodiment of this invention. It is a figure regarding 3rd embodiment of this invention. It is a figure which shows the modification of 3rd embodiment of this invention.

[First embodiment]
First, a first embodiment of the present invention will be described with reference to FIGS.

  A laser processing apparatus 10 according to the first embodiment of the present invention shown in FIG. 1 is for cutting a thin plate-shaped workpiece 30 made of metal or plastic, and includes a slide portion 12, a gas jet A part 14 and a machining head part 16 are provided.

  The slide unit 12 has a slide table (not shown) for placing the processing object 30 thereon. The slide table 12 is moved together with the slide table in the plane direction of the processing object 30 (in the front and back direction in FIG. 1). Therefore, it is configured to slide along the direction indicated by the arrow H in FIG.

  The gas injection unit 14 is configured to inject a high-pressure gas G such as nitrogen, oxygen, helium, argon, air, or the like toward a part of the workpiece 30 (a portion irradiated with a first laser beam L1 described later). Has been.

  The processing head unit 16 includes a laser oscillator 18 as a laser oscillation unit, a beam splitter 20 as a spectroscopic unit, a first lens 22 as a first emission unit, a total reflection mirror 24 as a second emission unit, a second The lens 26 and the galvanometer mirror 28 are provided.

  The laser oscillator 18 is configured to oscillate laser light L. The laser light L is, for example, a pulse having a wavelength of 266 to 1064 nm, an average output of 40 W, and a pulse width of 10 nsec or less, or a wavelength of 266 to 1064 nm and an average output of 1 kW.

  The beam splitter 20 is configured to split the laser light L oscillated from the laser oscillator 18 into a first laser light L1 and a second laser light L2. Further, the beam splitter 20 is configured to divide the laser light L so that the first laser light L1 has a larger light quantity than the second laser light L2.

  The first lens 22 is, for example, a condensing lens, and is configured to emit the first laser light L <b> 1 toward a part of the workpiece 30. In the laser processing apparatus 10, the focal position of the first lens 22 is set so that a part of the processing target 30 is melted by the first laser light L <b> 1 emitted from the first lens 22. Yes. Note that the condensing diameter of the first laser beam L1 is set to, for example, φ50 μm or less.

  The total reflection mirror 24 is disposed so as to reflect the second laser light L2 toward the second lens 26. The second lens 26 is, for example, a condensing lens, and is disposed so as to emit the second laser light L <b> 2 reflected by the total reflection mirror 24 toward the galvanometer mirror 28. The galvanometer mirror 28 is disposed so as to reflect the second laser light L2 emitted from the second lens 26 toward burrs 32 and 34 described later.

  Further, in the laser processing apparatus 10, the second laser light L 2 reflected by the galvano mirror 28 is collectively irradiated to the burrs 32 and 34 formed on the front side and the back side of the processing target 30, respectively. The focal position of the second lens 26, the reflection angle of the galvanometer mirror 28, and the like are set.

  Furthermore, in this laser processing apparatus 10, as shown in FIG. 2, the irradiation position of the first laser beam L1 onto the workpiece 30 is the irradiation position of the second laser beam L2 onto the workpiece 30. In addition, the positions, reflection angles, and the like of the beam splitter 20, the total reflection mirror 24, and the galvano mirror 28 are set so as to be positioned closer to the front side in the moving direction (arrow H direction) of the workpiece 30.

  Next, the operation and effect of the first embodiment of the present invention will be described together with the laser processing method using the laser processing apparatus 10 having the above configuration.

  In the laser processing apparatus 10, when the laser beam L is oscillated from the laser oscillator 18, the laser beam L is split into the first laser beam L 1 and the second laser beam L 2 by the beam splitter 20. At this time, the laser beam L is split by the beam splitter 20 so that the first laser beam L1 has a larger amount of light than the second laser beam L2.

  Then, the first laser beam L1 emitted from the beam splitter 20 is irradiated onto a part of the processing object 30 via the first lens 22, whereby a part of the processing object 30 is melted. Further, at this time, the high pressure gas G is injected from the gas injection unit 14 toward a part of the processing object 30, whereby a part of the processing object 30 is blown off and removed, and the processing object 30 is cut. Is done.

  Here, when the workpiece 30 is cut as described above, burrs 32 and 34 are formed on the front side and the back side of the workpiece 30 accordingly. For example, when the workpiece 30 is a copper plate having a thickness of 70 μm, the height of the burrs 32 and 34 is about 2 μm.

  However, in the laser processing apparatus 10, the second laser light L <b> 2 emitted from the beam splitter 20 is irradiated to the burrs 32 and 34 via the total reflection mirror 24, the second lens 26, and the galvanometer mirror 28. Thus, the burrs 32 and 34 are melted and smoothed.

  Thus, according to this laser processing apparatus 10, even if the burrs 32 and 34 are formed on the workpiece 30 as the workpiece 30 is cut, the burrs 32 and 34 are used as the second laser. Since it can be smoothed by the light L2, the quality of the processed object 30 after processing can be ensured.

  Moreover, in order to cut | disconnect the process target 30, many light quantities of the 1st laser beam L1 are required, on the other hand, in order to smooth | burr the burr | flash 32 and 34, the 2nd laser beam L2 Less light is enough.

  In this regard, according to the laser processing apparatus 10, the first laser beam L1 has a larger amount of light than the second laser beam L2, and thus is formed on the processing object 30 while cutting the processing object 30. The burrs 32, 34 thus made can be smoothed (the cutting of the workpiece 30 and the smoothing of the burrs 32, 34 can be made compatible).

  Further, according to the laser processing apparatus 10, even when burrs 32 and 34 are formed on the front side and the back side of the workpiece 30, the same second laser light L 2 is irradiated to the burrs 32 and 34. Thus, the burrs 32 and 34 can be smoothed. Therefore, for example, the configuration of the apparatus is simplified as compared with, for example, a configuration in which the second laser light L2 is divided into a plurality of parts and each of the burrs 32 and 34 is irradiated with the different second laser light L2. can do.

  According to the laser processing apparatus 10, the processing target 30 is cut from one end to the other end by processing the processing head 16 relative to the processing target 30, and the processing target 30 is processed. The product 36 and the waste pieces 38 can be separated.

  Next, a modification of the first embodiment of the present invention will be described.

  In the present embodiment, the second lens 26 is a condenser lens, but may be a collimator lens. The second lens 26 may be an f-θ lens, and may be disposed between the workpiece 30 and the galvanometer mirror 28.

  In the present embodiment, the laser processing apparatus 10 is configured to smooth the burrs 32 and 34 with the second laser light L2, but melts the burrs 32 and 34 with the second laser light L2. The melted burrs 32 and 34 may be removed by blowing off with the high-pressure gas G of the gas injection unit 14.

  Moreover, in this embodiment, although the laser processing apparatus 10 was set as the structure which cuts the process target object 30, you may be set as the structure which perforates the process target object 30. FIG.

  Further, when the laser processing apparatus 10 performs a drilling process on the processing object 30, the processing head unit 16 is configured to process the processing object 30 without moving relative to the processing object 30 (laser scanning). May be.

  In this case, the first laser beam L1 and the second laser beam L2 are long pulse laser beams having a phase difference with each other so that the first laser beam L1 and the second laser beam L2 do not interfere with each other. May be. Further, when the laser beam L is pulsed, the optical path lengths of the first laser beam L1 and the second laser beam L2 are made different using an optical fiber or the like, so that the first laser beam L1 and the second laser beam L2 The laser beam L2 and the emission timing may be shifted.

  Further, in the present embodiment, the processing head unit 16 includes the first lens 22 as the first emission unit and the total reflection mirror 24, the second lens 26, and the galvanometer mirror 28 as the second emission unit. However, instead of these, a plurality of optical fibers may be provided as the first emission part and the second emission part.

  In the present embodiment, the second lens 26 is moved in the direction of the optical axis of the second laser beam L2 in accordance with the size and position of the burrs 32 and 34, and the second burrs 32 and 34 are irradiated. The condensing diameter of the laser beam L2 may be adjusted.

  In the present embodiment, the arrangement of the beam splitter 20, the first lens 22, the total reflection mirror 24, the second lens 26, and the galvanometer mirror 28 may be changed as appropriate. Thereby, the condensing diameter of the second laser light L2 irradiated to the burrs 32 and 34 may be adjusted.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIGS.

  The laser processing apparatus 40 according to the second embodiment of the present invention shown in FIG. 3 is for forming the slit 66 in the workpiece 60, and the laser processing apparatus according to the first embodiment of the present invention described above. 10, the configuration of the machining head portion 16 is changed.

  That is, in the laser processing apparatus 40 according to the second embodiment of the present invention, the processing head unit 16 includes the laser oscillator 18, the beam splitter 20, the first lens 22, the beam splitter 50 as the second emission unit, the first Two lenses 52, total reflection mirrors 54 and 55, a second lens 56, and a galvanometer mirror 58 are provided.

  The laser oscillator 18, the beam splitter 20, and the first lens 22 have the same configuration as in the first embodiment of the present invention described above.

  The beam splitter 50 is configured to split the second laser light L2 emitted from the beam splitter 20 into a second laser light L2A and a second laser light L2B. The beam splitter 50 is configured to divide the second laser light L2 so that the light quantity of one second laser light L2A is equal to the light quantity of the other second laser light L2B.

  The second lens 52 is, for example, a condensing lens, and emits the second laser light L2A emitted from the beam splitter 50 toward burrs 62A and 62B formed on the front side of the workpiece 60 described later. It is supposed to be configured. The total reflection mirror 54 is disposed so as to reflect the other second laser beam L2B emitted from the beam splitter 50 toward the total reflection mirror 55. The total reflection mirror 55 is reflected by the total reflection mirror 54. The second laser beam L <b> 2 </ b> B is arranged so as to be reflected toward the second lens 56.

  The second lens 56 is, for example, a condensing lens, and is configured to emit the second laser light L <b> 2 </ b> B reflected by the total reflection mirror 55 toward the galvanometer mirror 58. The galvanometer mirror 58 is disposed so as to reflect the second laser light L2B emitted from the second lens 56 toward burrs 64A and 64B formed on the back side of the workpiece 60 described later.

  Further, in the laser processing apparatus 40, the second laser light L2A emitted from the second lens 52 is irradiated to the burrs 62A and 62B formed on the front side of the processing target 60. The focal position, the reflection angle of the beam splitter 50, and the like are set.

  Similarly, in the laser processing apparatus 40, the second laser beam L2B reflected by the galvanometer mirror 58 is irradiated to the burrs 64A and 64B formed on the back side of the processing target 60. The focal position, the reflection angle of the galvanometer mirror 58, and the like are set.

  Furthermore, in this laser processing apparatus 40, as shown in FIG. 4, the irradiation position of the first laser beam L1 on the processing target 60 is more toward the processing target 60 of the second laser beams L2A and L2B. The positions, reflection angles, and the like of the beam splitter 50, the total reflection mirrors 54 and 55, and the galvano mirror 58 are set so as to be positioned on the near side of the moving direction (arrow H direction) of the workpiece 60 from the irradiation position. Yes.

  Next, the operation and effect of the second embodiment of the present invention will be described together with the laser processing method using the laser processing apparatus 40 having the above configuration.

  In the laser processing apparatus 40, when the laser beam L is oscillated from the laser oscillator 18, the laser beam L is split into the first laser beam L 1 and the second laser beam L 2 by the beam splitter 20. At this time, the laser beam L is split by the beam splitter 20 so that the first laser beam L1 has a larger amount of light than the second laser beam L2.

  Then, the first laser beam L1 emitted from the beam splitter 50 is irradiated onto a part of the processing object 60 via the first lens 22, whereby a part of the processing object 60 is melted. Further, at this time, the high-pressure gas G is injected from the gas injection unit 14 toward a part of the processing object 60, and thereby, a part of the processing object 60 is blown off and removed, and the plate is applied to the processing object 60. A slit 66 penetrating in the thickness direction is formed.

  Here, when the slit 66 is formed in the workpiece 60 as described above, burrs 62A and 62B are formed on both sides of the slit 66 on the front side of the workpiece 60, and the workpiece 60 is also formed. The burrs 64A and 64B are formed on both sides of the slit 66 on the back side.

  However, in the laser processing apparatus 40, the second laser light L2 emitted from the beam splitter 20 is split by the beam splitter 50 into the second laser light L2A and the second laser light L2B. Then, the second laser light L2A emitted from the beam splitter 50 is irradiated onto the burrs 62A and 62B through the second lens 52, whereby the burrs 62A and 62B are melted and smoothed.

  Similarly, the second laser light L2B emitted from the beam splitter 50 is irradiated onto the light beams 64A and 64B via the total reflection mirrors 54 and 55, the second lens 56, and the galvanometer mirror 58, whereby the burr 64A. 64B is melted and smoothed.

  As described above, according to the laser processing apparatus 40, even if the burrs 62A, 62B, 64A, and 64B are formed on the workpiece 60 due to the formation of the slits 66 on the workpiece 60, the burrs 62A are formed. 62B, 64A, 64B can be smoothed by the second laser beams L2A, L2B, so that the quality of the workpiece 60 after processing can be ensured.

  Further, in order to form the slit 66 in the workpiece 60, a large amount of the first laser light L1 is necessary. On the other hand, in order to smooth the burrs 62A, 62B, 64A, 64B, The amount of the second laser beams L2A and L2B is small.

  In this regard, according to the laser processing apparatus 40, the first laser beam L1 has a larger amount of light than the second laser beams L2A and L2B. The burrs 62A, 62B, 64A, and 64B formed on the object 60 can be smoothed (the formation of the slit 66 and the smoothing of the burrs 62A, 62B, 64A, and 64B can be made compatible).

  Further, according to the laser processing apparatus 40, even when the burrs 62A, 62B, 64A, and 64B are formed on the front side and the back side of the workpiece 60, the second laser light L2 is the second laser light L2A, The burrs 62A, 62B, 64A and 64B can be smoothed by being divided into L2B and irradiating the burrs 62A, 62B, 64A and 64B with the different second laser beams L2A and L2B, respectively. .

  Therefore, for example, each burr 62A, 62B is not compared with a configuration in which the same second laser light L2 is irradiated to each burr 62A, 62B, 64A, 64B without dividing the second laser light L2 into a plurality of parts. , 64A, 64B can be melted more effectively.

  According to the laser processing apparatus 40, the slit 66 can be formed in the processing target 60 by moving the processing head unit 16 relative to the processing target 60.

  Next, a modification of the second embodiment of the present invention will be described.

  In the present embodiment, the laser processing apparatus 40 is configured to smooth the burrs 62A, 62B, 64A, and 64B with the second laser beams L2A and L2B, but the burrs 62A with the second laser beams L2A and L2B. , 62B, 64A, 64B may be melted, and the melted burrs 62A, 62B, 64A, 64B may be blown off by the high pressure gas G of the gas injection section 14 and removed.

  Further, in the present embodiment, the laser processing apparatus 40 is configured to form the slit 66 in the processing target 60, but the processing target 60 is similar to the modification in the first embodiment of the present invention described above. It may be configured to perform drilling.

  In the present embodiment, the processing head unit 16 includes the first lens 22 as the first emission unit, and the beam splitter 50, the second lens 52, the total reflection mirrors 54 and 55, and the second lens as the second emission unit. 56 and the galvanometer mirror 58 are provided, but instead of these, a plurality of optical fibers may be provided as the first emission part and the second emission part.

  In the present embodiment, the second lenses 52 and 56 are moved in the optical axis direction of the second laser beams L2A and L2B according to the size and position of the burrs 62A, 62B, 64A, and 64B, respectively, and the burrs 62A. , 62B, 64A, 64B may be adjusted in the condensing diameter of the second laser beams L2A, L2B.

  In the present embodiment, the arrangement of the beam splitter 20, the first lens 22, the beam splitter 50, the second lens 52, the total reflection mirrors 54 and 55, the second lens 56, and the galvanometer mirror 58 is appropriately changed. Also good. In addition, the condensing diameters of the second laser beams L2A and L2B irradiated to the burrs 62A, 62B, 64A, and 64B may thereby be adjusted.

  [Third embodiment]

  A laser processing apparatus 110 according to the third embodiment of the present invention shown in FIG. 5 is suitably used for cutting a thin plate material 150 having a thickness of 100 μm or less, and includes a light source 112, a beam splitter, and the like. 114, a total reflection mirror 116, a first lens 118, a second lens 120, a first roller mechanism 122, a second roller mechanism 124, and a gas ejection part 126.

  The light source 112 is configured to oscillate laser light L including pulsed or continuous wave first laser light L1 and second laser light L2. Here, as an example, the first laser beam L1 is a green laser beam having a wavelength of 532 nm, and the second laser beam L2 is a red laser beam having a wavelength of 1064 nm.

  The beam splitter 114 is configured to reflect the first laser beam L1 toward the first lens 118 and transmit the second laser beam L2, and the total reflection mirror 116 transmits the first laser beam L1 transmitted through the beam splitter 114. It arrange | positions so that the 2nd laser beam L2 may be reflected toward the 2nd lens 120. FIG.

  The first lens 118 is arranged so as to irradiate the thin plate material 150 with the first laser beam L1 reflected by the beam splitter 114, and the second lens 120 is a second lens 120 reflected by the total reflection mirror 116. It arrange | positions so that the laser beam L2 may be irradiated to the thin plate material 150. FIG.

  Further, in the laser processing apparatus 110, the thin plate material 150 is wound in the direction indicated by the arrow A by a first roller mechanism 122 and a second roller mechanism 124, which will be described later. The emitted second laser light L2 is irradiated to the front side in the winding direction of the thin plate material 150 than the first laser light L1. That is, in this laser processing apparatus 110, the thin plate material 150 is irradiated with the second laser light L2 following the first laser light L1.

  Furthermore, the first lens 118 is arranged so that the optical axis direction thereof coincides with the normal direction of the thin plate material 150, and the second lens 120 has the optical axis direction thereof with respect to the normal direction of the thin plate material 150. It is arranged to be inclined. As a result, as shown in FIG. 6, the first laser light L <b> 1 is irradiated on the surface of the thin plate material 150 in a perfect circle shape, and the second laser light L <b> 2 is elliptical on the surface of the thin plate material 150. It comes to be irradiated.

  As described above, the first laser beam L1 and the second laser beam L2 are respectively a green laser beam having a wavelength of 532 nm and a red laser beam having a wavelength of 1064 nm. In a state where the second lens 120 is in focus, the spot size of the second laser beam L2 is larger than the spot size of the first laser beam L1. In addition, the arrow B of FIG. 6 has shown the relative movement direction with respect to the thin plate material 150 of the 1st laser beam L1 and the 2nd laser beam L2.

Further, in the present embodiment, the thin plate material 150 is made of copper, and the first laser light L1 that is green laser light is more thin than the second laser light L2 that is red laser light. On the other hand, the heat absorption rate is high (see FIG. 7). FIG. 8 shows the relationship between the absorption rate and temperature for each material in the case of a CO ₂ laser.

  As shown in FIG. 5, the first roller mechanism 122 includes the first thin plate member 150-of the thin plate members 150 cut along the longitudinal direction by the first laser beam L1 and the second laser beam L2. 1 and the second roller mechanism 124 is configured to wind up the second thin plate material 150-2.

  The gas injection unit is configured to inject a gas such as oxygen, argon, helium, nitrogen, or the like toward the irradiated portion of the thin plate material 150 irradiated with the first laser beam L1 and the second laser beam L2. ing.

  In the present embodiment, the light source 112, the beam splitter 114, the total reflection mirror 116, the first lens 118, and the second lens 120 correspond to a laser irradiation unit in the present invention. Further, the beam splitter 114 and the first lens 118 correspond to a first emission part in the present invention, and the total reflection mirror 116 and the second lens 120 correspond to a second emission part in the present invention.

  The outputs of the first laser beam L1 and the second laser beam L2 are set to optimum values so that a cutting method described later can be realized.

  Next, a method for cutting the thin plate material 150 using the laser processing apparatus 110 described above will be described.

  In this laser processing apparatus 110, while the thin plate material 150 wound around the bobbin 152 is wound up by the first roller mechanism 122 and the second roller mechanism 124, the thin plate material 150 is irradiated with the first laser beam L1, Following this first laser beam L1, the second laser beam L2 is applied to the thin plate material 150. The conditions at this time are as shown in FIGS.

  In actual cutting, even if the spot diameter is determined from the beginning in the lens system, the cutting width formed differs depending on the processing speed. This is because it depends on the interaction between light and material. That is, it is because of the thermal reaction of the material. For this reason, it is difficult to determine the optimum spot diameter for a certain plate thickness, other than confirming it by experiments. In a state where cutting can be performed at high speed, the gas flow in the groove is maximized. In other words, the gas flow is the fastest during an optimal cutting that can be cut at high speed. FIG. 11 shows the conditions under which the gas flows at a high speed from the groove width that is assumed to be obtained at a certain speed because what is actually obtained from the spot diameter varies depending on the material reaction. When the plate thickness is changed, the inflow speed becomes maximum when the cutting width is around 170 μm when the plate thickness is 1.2 mm, the cutting width becomes maximum when the cutting thickness is around 240 μm when the plate thickness is 2.3 mm, and the cutting width becomes large when the plate thickness is 3.2 mm. The maximum is around 320 μm. Thus, as the plate thickness increases, the maximum gas inflow rate in the groove shifts toward the wider cutting groove width. Moreover, as the plate thickness increases, the gas inflow rate and mass flow rate decrease as a whole. When the plate thickness is increased, the width of the cut groove is the same as the result of actual machining.

  Here, when the thin plate material 150 is irradiated with the first laser beam L1, an oxidation reforming portion 150A is formed in the thin plate material 150 (see FIG. 7). Further, when the second laser beam L2 is irradiated to the oxidation reforming portion 150A, the oxidation reforming portion 150A is removed. And in this laser processing apparatus 110, the thin plate material 150 is cut | disconnected in this way, removing the oxidation modification part 150A.

  At this time, burrs are formed on the thin plate material 150 by irradiating the first laser beam L1 to the thin plate material 150. This burr is irradiated with the second laser beam L2. The burrs melt and become smaller.

  In this manner, the thin plate material 150 is cut in the laser processing apparatus 110.

  Next, the operation and effect of the third embodiment of the present invention will be described.

  According to this laser processing apparatus 110, the thin plate material 150 is irradiated with the second laser beam L2 having a spot size larger than the first laser beam L1 following the first laser beam L1, so that the first laser beam The burr formed on the thin plate material 150 by irradiating the thin plate material 150 with the light L1 can be melted by the second laser light L2. Thereby, the surface roughness after a process can be made small.

  Further, by irradiating the thin plate material 150 with the first laser beam L1 and the second laser beam L2 having different wavelengths, the first laser beam L1 forms the oxidation modified portion 150A in the thin plate material 150, and The thin plate member 150 can be cut while removing the oxidation modified portion 150A by the second laser beam L2. Thereby, the surface roughness after a process can be made still smaller.

  Furthermore, since the single light source 112 that oscillates the first laser beam L1 and the second laser beam L2 is used, the cost of the apparatus can be reduced.

  In addition, when the light source 112 oscillates the first laser beam L1 and the second laser beam L2 of the pulse wave, the pulse interval between the first laser beam L1 and the second laser beam L2 is optimized. If adjusted, a desired surface roughness can be obtained.

  On the other hand, when the light source 112 oscillates the continuous laser beam L1 and the second laser beam L2, a desired surface roughness can be obtained continuously.

  The verification experiment conducted at this time is as shown in FIG.

  Next, a modification of the third embodiment of the present invention will be described.

  In the above-described embodiment, the laser processing apparatus 110 is used to cut the copper thin plate material 150, but may be used to cut the thin plate material 150 such as other metals or ceramics.

  The light source 112 oscillates a laser beam including a green laser beam having a wavelength of 532 nm as the first laser beam L1 and a red laser beam having a wavelength of 1064 nm as the second laser beam L2. However, if the first laser beam L1 has a higher heat absorption rate than the second laser beam L2 with respect to the thin plate material 150 and has a larger spot size, the first laser beam and the second laser beam are used. The light may be configured to oscillate laser light including other combinations.

  In addition, the laser processing apparatus 110 is configured to irradiate the thin plate material 150 with the first laser light L1 and the second laser light L2, but is configured to irradiate the thin plate material 150 with three or more laser beams. May be.

  As the laser processing apparatus 110, as shown in FIG. 12, an apparatus including variable curvature mirrors 160 and 162 that can be finely adjusted with a piezoelectric element (not shown) and a beam branching mirror 164 may be used.

  Although one embodiment of the present invention has been described above, the present invention is not limited to the above, and other various modifications can be made without departing from the spirit of the present invention. It is.

Claims (19)

A laser oscillation section for oscillating laser light;
A spectroscopic unit that divides the laser beam oscillated from the laser oscillation unit into a first laser beam and a second laser beam;
A first emitting unit that emits the first laser beam toward a part of the processing object so that a part of the processing object is removed;
A second emitting portion for emitting the second laser beam toward the burr so that the burr formed on the workpiece is melted as part of the workpiece is removed; ,
A laser processing apparatus comprising: The spectroscopic unit divides the laser beam so that the first laser beam has a larger light quantity than the second laser beam.
The laser processing apparatus according to claim 1. The second emission part emits the same second laser beam toward the burrs formed on the front side and the back side of the workpiece,
The laser processing apparatus according to claim 1 or 2. The second emission part divides the second laser light into a plurality of parts and emits the second laser lights different from each other toward the burrs formed on the front side and the back side of the workpiece,
The laser processing apparatus according to claim 1 or 2.   The laser beam oscillated from the laser oscillator is divided into a first laser beam and a second laser beam, and the first laser beam is irradiated to a part of the processing target to irradiate the processing target. Laser processing that removes a part and irradiates the burr formed on the workpiece with the removal of a part of the workpiece and melts the burr. Method. Dividing the laser beam so that the first laser beam has a larger light quantity than the first laser beam;
The laser processing method according to claim 5. Irradiating the same second laser light to the burrs formed on the front side and the back side of the workpiece, respectively, to melt the burrs;
The laser processing method according to claim 5 or 6. The second laser beam is divided into a plurality of pieces, and the burrs formed on the front side and the back side of the workpiece are irradiated with the second laser beams different from each other to melt the burrs.
The laser processing method according to claim 5 or 6. A laser processing apparatus for cutting a thin plate material having a thickness of 100 μm or less,
Irradiating the thin plate material with a first laser beam, and following the first laser beam, irradiating the thin plate material with a second laser beam having a spot size larger than the first laser beam. A laser processing apparatus provided with a laser irradiation unit for cutting a thin plate material. The laser irradiation unit irradiates the thin plate material with the first laser light and the second laser light having different wavelengths.
The laser processing apparatus according to claim 9. The laser irradiation unit includes a single light source that oscillates the first laser light and the second laser light in a pulse wave or continuous wave,
A first emission part for emitting the first laser beam oscillated from the light source toward the thin plate material;
A second emission part for emitting the second laser light oscillated from the light source toward the thin plate material;
Having
The laser processing apparatus of Claim 9 or Claim 11. The laser irradiation unit irradiates the burr with the second laser beam so that the burr formed on the thin plate material is melted by irradiating the first plate with the first laser beam.
The laser processing apparatus according to any one of claims 9 to 11. At least one laser oscillation unit that oscillates laser light;
A laser processing apparatus comprising: a laser irradiation unit configured to irradiate at least two or more laser beams oscillated from the laser oscillation unit following a workpiece;
The laser irradiation unit forms an oxidation reforming portion on the workpiece by first laser light irradiated first, and cuts the workpiece by removing the oxidation reforming portion.
Laser processing equipment. The laser irradiation unit is configured such that the wavelength of the first laser beam irradiated first is different from the wavelength of the laser beam irradiated second or later,
The laser processing apparatus according to claim 13. The laser irradiation unit is configured such that the first laser beam irradiated to the workpiece first has a wavelength higher in absorption rate than the laser beam irradiated second or later.
The laser processing apparatus according to claim 14. The same number of types of wavelengths of laser light to be irradiated are installed in the laser oscillation unit,
The laser processing apparatus according to claim 14. The workpiece is temperature controlled in order to increase the absorption rate of the irradiated laser beam.
The laser processing apparatus according to claim 13. The workpiece is controlled at different temperatures depending on the material,
The laser processing apparatus according to claim 17. A spectroscopic unit that divides the laser beam oscillated from the laser oscillation unit into a plurality of laser beams,
The laser processing apparatus according to claim 13.

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