JP6027852B2 - Laser processing machine head - Google Patents

Description

  The present invention relates to a processing head for a laser beam machine, and more specifically, prevents dust such as dust accompanying laser processing from adhering to the protective glass that protects the condensing lens and its peripheral portion. The present invention relates to a machining head for a laser beam machine capable of easily performing maintenance.

  Conventionally, a protective member is disposed between the laser beam emitting portion of the processing optical system and the workpiece, and the scattered object that has entered between the processing optical system and the protective member is prevented from colliding with the lens. A processing apparatus is disclosed (for example, refer to Patent Document 1).

JP 2008-36665 A

  Here, if the laser processing machine is used for a certain period, scattered objects may adhere to the protective member and affect the processing performance. Therefore, it is necessary to periodically perform maintenance such as replacement of the protective member. In the laser processing apparatus disclosed in Patent Document 1, a protective member is attached to the outside of a cover that covers a base that stores a processing optical system such as a reflecting mirror and a condenser lens. Since the protective member and the cover to which the protective member is attached are exposed to the environment where the scattered objects are scattered, it is possible to prevent the scattered objects from adhering to the reflecting mirror and the condenser lens. There is a risk that scattered matter attached to the cover may adhere to the protective member during maintenance such as replacement of the protective member. In particular, in a laser processing apparatus using a laser beam having a wavelength of about 1 μm, even a slight amount of dirt may adversely affect the processing quality, and there is room for improvement.

  The present invention has been made in view of the above-mentioned problems, and its purpose is to prevent dirt such as dust accompanying laser processing from adhering to the protective glass or protective glass cartridge that protects the condenser lens. An object of the present invention is to provide a laser processing machine that can easily perform maintenance of protective glass.

The above object of the present invention can be achieved by the following constitution.
That is, the invention according to claim 1
A laser that includes a condensing lens that focuses laser light, and a protective glass that is disposed downstream of the condensing lens in the laser light emission direction and protects the condensing lens, and that irradiates the workpiece with laser light and processes the laser A processing head for a processing machine,
A protective glass cartridge for holding the protective glass;
A housing including an opening / closing door for forming the storage chamber for storing the condensing lens and the protective glass cartridge, and for opening the storage chamber to the outside or blocking the outside from the outside,
With
The protective glass cartridge is attached and detached with the opening / closing door opened.

The invention of claim 2 is the configuration of claim 1,
The condenser lens is installed in a lens holder, and is accommodated in the accommodation chamber so as to be adjustable in the laser beam emission direction.
The housing includes an upper fixed cylinder and a lower fixed cylinder that are concentric with each other and project into the storage chamber,
The lens holder has an upper movable cylinder and a lower movable cylinder that are slidably fitted to the upper fixed cylinder and the lower fixed cylinder of the housing, respectively.
In the lower fixed cylinder, a concave portion that opens in a direction perpendicular to the laser beam emission direction is formed in a portion protruding into the accommodation chamber,
The protective glass cartridge is detachably mounted in the recess.

  According to the first aspect of the present invention, the protective glass cartridge for holding the protective glass and the storage chamber for storing the condenser lens and the protective glass cartridge are formed, and the open / close door for opening the storage chamber to the outside or shutting off the outside is provided. And a protective glass cartridge is attached and detached with the open / close door open. As a result, dust generated during workpiece processing is prevented from entering the storage chamber, and not only the condensing lens, the protective glass, and the protective glass cartridge, but also the peripheral portions stored in the storage chamber are contaminated with dust. It will not be done. Thereby, at the time of maintenance such as periodic replacement of the protective glass cartridge, there is no possibility that the protective glass or the protective glass cartridge is contaminated by dust falling from the peripheral portion, and the processing quality can be maintained.

  According to claim 2, the housing includes an upper fixed cylinder and a lower fixed cylinder that are concentric with each other and project into the housing chamber, and the lens holder is slidable on the upper fixed cylinder and the lower fixed cylinder of the housing, respectively. Since it has the upper movable cylinder and the lower movable cylinder which fit outside, the condensing lens installed in the lens holder can be accurately adjusted in the laser beam emitting direction in the accommodation chamber. In addition, the protective glass cartridge is detachably mounted in a concave portion formed so as to open in a direction orthogonal to the laser beam emitting direction in a portion protruding into the storage chamber of the lower fixed portion, so that the storage chamber is compact. Can be designed to

1 is a schematic plan view of a laser beam machine to which a machining head for a laser beam machine according to the present invention is applied. It is a schematic side view of the laser processing machine shown in FIG. It is a perspective view of a processing head drive mechanism. It is a perspective view of the processing head accommodated in the housing. It is a rear view of the laser processing machine shown in FIG. It is sectional drawing of a process head. It is a perspective view of the processing head which shows the state which opened the opening-and-closing door of the housing.

Hereinafter, a laser beam machine to which a machining head for a laser beam machine according to the present invention is applied will be described in detail with reference to the drawings.
As shown in FIGS. 1 and 2, the laser processing machine 10 is connected to the processing machine body 20, a laser oscillator 21 and a control device 22 built in the processing machine body 20, and the processing machine body 20. Pallet changer 23, booster compressor 24 and air compressor 25 used to separate nitrogen gas in the air, assist gas supply unit 27 including nitrogen and oxygen gas cylinder 26, laser oscillator 21 and laser processing A chiller unit 28 for supplying cooling water for cooling the head 40 and a dust collector 29 for removing dust generated during processing are mainly provided.
In the present embodiment, the front represents a direction closer to the processing machine main body 20 in the arrangement direction of the processing machine main body 20 and the pallet changer 23 (X direction in FIG. 1), and the rear represents the pallet in the arrangement direction. This represents the direction closer to the changer 23. Further, the left side and the right side are represented by directions when the front is viewed from the rear in a direction (Y direction in FIG. 1) orthogonal to the arrangement direction.

  In the cabin 30 of the processing machine body 20, a pallet driving mechanism 32 that drives the pallet 31 in the longitudinal direction (X direction) of the cabin 30, which is a predetermined direction, and a workpiece W mounted on the pallet 31 are processed. A laser processing head 40 for irradiating laser light, a processing head drive mechanism 49 for driving the laser processing head 40, and a recovery conveyor 60 for recovering chips and the like cut during processing are accommodated.

As shown in FIG. 3, the machining head 40 can be moved in the X direction, the width direction (Y direction) of the cabin 30, and the vertical direction (Z direction) of the cabin 30 by a machining head drive mechanism 49. Specifically, a pair of support bases 41 provided on the left and right sides are arranged so as to straddle a beam-shaped X-direction movable base 42, and the X-direction movable base 42 is driven in the X direction by an X-axis motor 43. . The X-direction movable table 42 is provided with a Y-direction movable table 45 that is driven by a Y-axis motor 44 and can move in the Y direction. The Y-direction movable table 45 is driven in the Y direction by a rack and pinion mechanism in which a not-illustrated pinion fixed to the rotation shaft of the Y-axis motor 44 meshes with a rack (not illustrated) arranged in the X-direction movable table 42. The Further, the machining head 40 is disposed on the Y-direction movable table 45 so as to be movable in the Z direction using a rack and pinion mechanism driven by a Z-axis motor 46.
Note that the machining head 40 indicated by the solid line in FIG. 1 and the dotted line in FIG. 2 represents the most forward position in the X direction, and the machining head 40 indicated by the alternate long and short dash line in FIGS. The state located at is shown.

  A fiber cable (only the tip is shown) 50 extending from the laser oscillator 21 is connected to the processing head 40 by being routed through an X-direction cable bear 48x and a Y-direction cable bear 48y. Further, in the processing head 40, a collimator lens 51 for collimating the laser light emitted from the exit end of the fiber cable 50 and a condensing lens 52 for condensing the collimated laser light. And the condensing lens 52 is provided such that its position can be adjusted in the Z direction with respect to the processing head 40. In addition, since the well-known thing is applicable for the structure of the laser oscillator 21, detailed description is abbreviate | omitted.

  Further, as shown in FIG. 4, a cooling pipe 56 supplied from the chiller unit 28 is connected around the processing head 40, and cools the emission end of the fiber cable 50 and the periphery of the condenser lens 52. . Further, around the processing head 40, a gas supply pipe 57 that supplies an assist gas of nitrogen gas or oxygen gas from the assist gas supply unit 27 to the processing head 40 and the vicinity of the laser nozzle 53 of the processing head 40. In addition, another gas supply pipe 58 connected to the side nozzle 54 for blowing an assist gas of nitrogen gas or oxygen gas is provided.

  The cooling pipe 56 and the gas supply pipes 57 and 58 are routed to the X-direction cable bear 48x and the Y-direction cable bear 48y together with the fiber cable 50 after passing through the Z-direction cable bear 48z. Then, the chiller unit 28 and the assist gas supply unit 27 are connected.

  When the processing head 40 operates the laser oscillator 21, the laser beam is collimated by the collimator lens 51 via the fiber cable 50, and the collimated laser beam is incident on the condenser lens 52 and condensed. Then, the workpiece W is processed by being irradiated from the laser nozzle 53 onto the processing portion of the workpiece W. At the time of processing, the assist gas supplied from the assist gas supply unit 27 is ejected from the laser nozzle 53 and the side nozzle 54 toward the processing unit of the workpiece W, and the molten metal generated during the processing is blown off. Details of the machining head 40 will be described later.

  As shown in FIGS. 1 and 2, the pallet driving mechanism 32 is disposed at a position facing the right side surface of the pallet 31 along the X direction, and an endless chain 34 that is rotationally driven by a drive motor 33, and the pallet 31. A plurality of rollers 36 provided on the lower surface side of the roller are guided to roll and have a rail 35 that supports the pallet 31. When the endless chain 34 is rotationally driven by the drive motor 33, a pin (not shown) provided on the endless chain 34 engages with an engaging portion (not shown) of the pallet 31, and the pallet on the rail 35. 31 is moved in the X direction.

  The cabin 30 is provided with a gull wing 38 as an opening / closing door on the front surface 30F, and a loading / unloading port 37 formed in a horizontally long slit shape on the back surface 30R opposite to the front surface 30F corresponding to the pallet changer 23. It has been. Thus, when processing a large lot product, the pallet 31 on which the workpiece W is placed is loaded / unloaded via the loading / unloading port 37, and when processing a small lot product, the workpiece W is loaded / unloaded from the gull wing 38 to correspond to the size of the lot. Can be carried out.

  In addition, a first operation panel 75 is disposed on the side of the gull wing 38 on the front surface 30F, and a second operation panel 70 is disposed on the left side surface 30L orthogonal to the front surface 30F and the back surface 30R. . Further, a foot switch 76 is disposed below the gull wing 38 on the front surface 30F of the cabin 30.

  As shown in FIGS. 1, 2, and 5, the pallet changer 23 is disposed to face the back surface 30 </ b> R of the cabin 30 provided with the loading / unloading port 37. The pallet changer 23 has a movable frame 62 that is driven up and down by a drive mechanism 61 shown in FIG. 1, and two pallets 31 are placed on a substantially U-shaped rail 63 provided on the left and right sides of the movable frame 62. Two stages can be arranged vertically.

  The upper pallet 31 is placed on the upper rail surface 63 a of the U-shaped rail 63, and the lower pallet 31 is placed on the lower rail surface 63 b of the U-shaped rail 63. . The pallet 31 arranged in two stages on the U-shaped rail 63 moves the pallet 31 on the substantially U-shaped rail 63 up and down by driving the movable frame 62 up and down by the drive mechanism 61, so that the cabin The height of the pallet 31 can be adjusted so as to be the same height as the rail 35 disposed in the pallet 30, and the pallet 31 positioned at the same height as the rail 35 is connected to the pallet changer 23 and the cabin 30 via the loading / unloading port 37. You can carry in and out.

Also, below the movable frame 62, a free bearing 64 for moving the workpiece W on the pallet 31 so as to abut the workpiece W against the reference of the pallet 31 is provided so as to be movable up and down (see FIG. 5).
In FIG. 1 and FIG. 2, reference numeral 65 denotes another foot switch for operating the drive mechanism 61 that drives the free bearing 64 up and down.

  As shown in FIG. 1, a sensor composed of a projector 71, a reflector 72, and a light receiver 73 is disposed at each corner of the work area WA surrounding the pallet changer 23, and the light emitted from the projector 71 is By reflecting by the three reflecting plates 72 and receiving light by the light receiver 73, the entry / exit of the worker into the work area WA is monitored. In addition, an area sensor 74 is provided on the back surface 30R of the cabin 30 to detect the presence or absence of an operator in the work area WA. When the sensor composed of the projector 71, the reflector 72, and the light receiver 73 or the area sensor 74 is activated, it is determined that there is an operator in the work area WA and the operation of the laser processing machine 10 is prohibited. Operator safety is ensured.

  Here, as shown in FIG. 6, the processing head 40 has a lens holder 80 that holds the condenser lens 52, a protective glass cartridge 90 that holds the protective glass 91, and an opening / closing door 102 on the front side, and the lens And a housing 100 that forms a storage chamber 101 for storing the holder 80 and the protective glass cartridge 90.

  The lens holder 80 slides on a lens cartridge 82 that holds the condenser lens 52, an upper movable cylinder 83 that is slidably fitted on an upper fixed cylinder 105 of the housing 100 described later, and a lower fixed cylinder 106 of the housing 100. A lower movable cylinder 84 that is movably fitted, and an intermediate movable cylinder 85 that is disposed between the upper movable cylinder 83 and the lower movable cylinder 84 and is detachably mounted from the opening / closing door 102 side.

  Therefore, the lens cartridge 82 is detachable from the lens holder 80 by opening the open / close door 102 and removing the intermediate movable cylinder 85 from a direction orthogonal to the laser beam emission direction (right side in FIG. 6).

  The housing 100 is formed in a substantially rectangular box shape having a storage chamber 101 therein, and an opening / closing door 102 for opening the storage chamber 101 to the outside or shutting it off from the outside is provided on the front side. In 104, a cylindrical upper fixed cylinder 105 and a lower fixed cylinder 106 are arranged concentrically with each other. The distal ends of the upper fixed cylinder 105 and the lower fixed cylinder 106 protrude into the storage chamber 101.

  A recessed portion 107 for mounting the protective glass cartridge 90 is formed on the front protruding side, that is, the opening / closing door 102 side at a portion of the lower fixed cylinder 106 protruding into the housing chamber 101. It is detachably mounted from a direction (front side) orthogonal to the emission direction. A laser nozzle 53 for ejecting an assist gas such as nitrogen or oxygen supplied from the assist gas supply unit 27 via the nozzle holder 108 to the processing unit of the workpiece W is provided at the lower end of the lower fixed cylinder 106. It is attached.

  The lens holder 80 is supported by the portions of the upper fixed cylinder 105 and the lower fixed cylinder 106 that protrude into the housing chamber 101 so as to be movable in the laser beam emission direction (vertical direction in FIG. 6). Then, when the lens holder 80 is moved in the vertical direction by a driving mechanism (not shown), the condensing lens 52 is moved, and the laser light is condensed on the processing portion of the workpiece W.

  Here, along with the laser processing of the workpiece W, dust such as molten metal is scattered around the processing portion and the processing head 40 and adheres to the lower surface of the protective glass 91. For this reason, after the laser processing machine 10 is used for a certain period, maintenance such as replacement of the protective glass 91 is periodically performed in order to maintain the processing performance. In particular, in the laser processing machine 10 using a laser beam having a wavelength of about 1 μm, a slight contamination has a great influence on the processing performance, so that the maintenance of the protective glass 91 is important.

  As shown in FIGS. 6 and 7, maintenance of the protective glass 91 is performed by opening the door 102 of the housing 100 and extracting the protective glass cartridge 90 from the concave portion 107 of the lower fixed cylinder 106 to the front side. Then, the protective glass cartridge 90 holding the cleaned or new protective glass 91 is mounted in the recess 107.

  At this time, since the protective glass cartridge 90 and the concave portion 107 of the lower fixed cylinder 106 are accommodated in the housing 100 and are not contaminated with dust, when the protective glass cartridge 90 is attached to the concave portion 107, the protective glass cartridge It is possible to prevent dust from falling from 90 or the lower fixing portion 106 to the protective glass 91.

  As described above, according to the laser beam machine processing head 40 of the present embodiment, the protective glass cartridge 90 that holds the protective glass 91 and the storage chamber 101 that stores the condenser lens 52 and the protective glass cartridge 90 are formed. And a housing 100 including an opening / closing door 102 for opening the storage chamber 101 to the outside or blocking the outside. The protective glass cartridge 90 is attached and detached with the opening / closing door 102 opened. Accordingly, dirt such as dust generated during workpiece processing is prevented from entering the storage chamber 101, and the condenser lens 52, the protective glass 91, and the protective glass cartridge 90 are, of course, stored in the storage chamber 101. These peripheral parts are not contaminated with dust or the like. Thereby, at the time of maintenance such as periodic replacement of the protective glass cartridge 90, there is no possibility that the protective glass cartridge 90 is contaminated by dust falling from the peripheral portion, and the processing quality can be maintained.

  The housing 100 includes upper and lower fixed cylinders 105 and 106 protruding into the storage chamber 101, and the lens holder 80 is slidably fitted on the upper and lower fixed cylinders 105 and 106, respectively. Since the side movable cylinders 83 and 84 are provided, the condensing lens 52 installed in the lens holder 80 can be accurately adjusted in the laser beam emission direction in the accommodation chamber 101. Further, since the protective glass cartridge 90 is mounted in a concave portion 107 formed so as to open in a direction perpendicular to the laser beam emitting direction in a portion protruding into the storage chamber 101 of the lower fixed cylinder 106, the storage chamber 101 can be designed compactly.

  In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably.

10 Laser processing machine 40 Processing head (processing head for laser processing machine)
52 Condensing lens 80 Lens holder 82 Lens cartridge 83 Upper movable cylinder 84 Lower movable cylinder 85 Intermediate movable cylinder 90 Protective glass cartridge 91 Protective glass 100 Housing 101 Storage chamber 102 Opening / closing door 105 Upper fixed cylinder 106 Lower fixed cylinder 107 Recess W work

Claims (1)

A laser that includes a condensing lens that focuses laser light, and a protective glass that is disposed downstream of the condensing lens in the laser light emission direction and protects the condensing lens, and that irradiates the workpiece with laser light and processes the laser A processing head for a processing machine,
A protective glass cartridge for holding the protective glass;
A housing including an opening / closing door for forming the storage chamber for storing the condensing lens and the protective glass cartridge, and for opening the storage chamber to the outside or blocking the outside from the outside,
With
The protective glass cartridge is attached and detached with the open / close door open ,
The condenser lens is installed in a lens holder, and is accommodated in the accommodation chamber so as to be adjustable in the laser beam emission direction.
The housing includes an upper fixed cylinder and a lower fixed cylinder that are concentric with each other and project into the storage chamber,
The lens holder has an upper movable cylinder and a lower movable cylinder that are slidably fitted to the upper fixed cylinder and the lower fixed cylinder of the housing, respectively.
In the lower fixed cylinder, a concave portion that opens in a direction perpendicular to the laser beam emission direction is formed in a portion protruding into the accommodation chamber,
The processing head for a laser beam machine , wherein the protective glass cartridge is detachably attached to the recess .

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