JP3916306B2 - Fire extinguishing method and apparatus for laser beam machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a fire extinguishing method and an apparatus therefor in a laser beam machine.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in a plate material processing apparatus that performs laser processing such as a punch / laser composite machine or a laser processing machine, a heat-resistant brush table is used as a table on which a workpiece is placed in the case of downward molding or scratch countermeasure specifications.
[0003]
Spatter of the workpiece melted by laser processing is scattered around the processing position. The scattered spatter and the like were sucked by the dust collector from the lower surface or the vicinity of the upper surface of the workpiece.
[0004]
[Problems to be solved by the invention]
By the way, the conventional dust collector in a punch / laser composite machine or laser processing machine cannot sufficiently suck spatter, etc., so if grease or air blow oil adheres to a heat-resistant brush table, spatter during laser processing will not occur. When scattering or cutting is performed under the condition of oxygen assist gas, there is a problem that the brush may burn due to sputtering, and a fire actually occurs.
[0005]
The present invention has been made to solve the above-mentioned problems, and its purpose is in a laser processing machine that extinguishes fire of a brush table caused by spatter generated when laser processing a workpiece on the brush table. It is providing the fire extinguishing method and its apparatus.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, a fire extinguishing method in a laser beam machine according to the present invention according to claim 1 is characterized in that the brush table starts from a nozzle at the lower end of a laser machining head provided above a brush table having a large number of brushes implanted on the surface thereof. In a fire extinguishing method in a laser processing machine that performs laser processing by irradiating a workpiece placed on the laser beam,
Cover the brush table around the laser processing head with a processing head cover, detect a fire in the processing head cover with a fire detection sensor, and spray a fire extinguishing agent into the processing head cover with the detection signal of the fire detection sensor It is characterized by.
[0007]
Accordingly, the workpiece is laser processed in the processing head cover, and the spatter generated at this time is scattered around, is shielded by the processing head cover, and falls onto the brush table in the processing head cover. When spatter ignites grease or air blow oil adhering to a heat-resistant brush table and a fire occurs, the temperature in the processing head cover rises. A fire extinguisher is injected into the processing head cover from the fire extinguisher injection port by the detection signal of the temperature sensor, and the fire is extinguished.
[0010]
According to a second aspect of the present invention, there is provided a fire extinguishing apparatus for a laser beam machine according to a second aspect of the present invention. In a fire extinguisher in a laser processing machine that performs laser processing by irradiating a laser beam,
A processing head cover for covering the brush table around the laser processing head is provided, a fire detection sensor for detecting a fire is provided in the processing head cover, and a fire extinguishing agent supply device for supplying a fire extinguishing agent is provided in the processing head cover. The fire extinguishing agent supply device is provided with a control device for instructing the fire extinguishing agent to be ejected into the machining head cover by the detection signal of the fire detection sensor.
[0011]
Accordingly, the workpiece is laser processed in the processing head cover, and the spatter generated at this time is scattered around, is shielded by the processing head cover, and falls onto the brush table in the processing head cover. When spatter ignites grease or air blow oil adhering to a heat-resistant brush table and a fire occurs, the temperature in the processing head cover rises. In the control device, a command is issued to the extinguishing agent supply device by a detection signal of the temperature sensor. In the extinguishing agent supply device, the extinguishing agent is injected into the processing head cover from the extinguishing agent injection port, and the fire is extinguished.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of a fire extinguishing method and apparatus in a laser beam machine according to the present invention will be described with reference to the drawings, taking a punch / laser complex machine as an example.
[0015]
Referring to FIG. 4, the punch / laser combined processing machine 1 according to the present embodiment is separated from a lower frame (not shown) and a support column (not shown) as needed to provide a work area on the lower frame. A frame body is constituted by an upper frame (not shown) or the like that is provided integrally with each other.
[0016]
A punching portion for punching the workpiece W is provided on one side of the work area. The punching portion is a disc-shaped upper turret 3 that is rotatably attached to the upper frame, and a disc-like lower turret that is appropriately separated from the upper turret 3 and that is rotatably attached to the lower frame. 5 or the like. On the concentric circles of the upper turret 3, punches 7 that are appropriately spaced in the circumferential direction are detachably mounted. An appropriate number of dies 9 corresponding to the plurality of punches 7 are detachably mounted on the lower turret 5.
[0017]
The upper and lower turrets 3 and 5 are rotated in the same direction in synchronization by a turret drive mechanism (not shown), and are indexed and stopped at a predetermined position. The punch 7 mounted on the upper turret 3 is struck by a striker (not shown) that moves up and down via a ram actuating part (not shown) provided in the upper frame at a processing station indexed to the processing position. It is. The punching position is shown in FIGS. It is represented by C.
[0018]
Further, in the combined punch and laser processing machine 1, a laser processing head 11 is provided on the upper frame on the right side of the processing position of the upper and lower turrets 3 and 5 in FIG. A laser beam is emitted toward the workpiece W.
[0019]
More specifically, the punch / laser composite processing machine 1 has a built-in laser oscillator (not shown) that oscillates a laser beam, and the laser beam oscillated by the laser oscillator passes through an intensity adjusting device (not shown). Reflected downward in the vertical direction through a bend mirror (not shown) at a portion 11. This laser beam is focused by a focusing lens (not shown) provided inside the laser processing head 11. Laser processing, such as cutting the laser beam into a desired shape, is performed by focusing the laser beam on the workpiece W transferred and positioned with respect to the irradiation optical axis of the focused laser beam. The laser processing position is shown in FIGS. It is represented by C.
[0020]
On the other side of the lower frame, a center table 13 (fixed table) on which the workpiece W is placed is provided. In the side surface direction (vertical direction in FIG. A side table 15 (movable table) for mounting and supporting W is mounted so as to be movable in the left-right direction in FIG.
[0021]
The center table 13 and the side table 15 are, for example, a brush table 19 having a large number of heat-resistant brushes 17 implanted on the surface thereof as shown in FIG.
[0022]
The side table 15 is integrally connected to each other through a carriage base 21 whose one end extends in a direction orthogonal to the moving direction. The longitudinal direction of the carriage base 21 is connected to the carriage base 21. The carriage 23 is slidable in the same direction. An appropriate number (two in the example of the present embodiment) of clamping devices 25 capable of gripping the ends of the workpiece W are mounted on the carriage 23 so as to be movable and fixed in the movement direction of the carriage 23.
[0023]
A ball screw (not shown) to which a carriage 23 is attached is provided in the longitudinal direction of the carriage base 21, and an X-axis drive motor (not shown) is connected to the ball screw via a transmission member.
[0024]
With the above configuration, when the X-axis drive motor is driven, the carriage 23 is moved in the vertical direction (X-axis direction) in FIG. 3 via the ball screw. One end of the carriage 23 is connected to a Y-axis drive motor (not shown), and the carriage base 21 is moved in the left-right direction (Y-axis direction) by driving the Y-axis drive motor. Become. Therefore, the workpiece W gripped by the clamp device 25 is moved in the X-axis and Y-axis directions.
[0025]
Next, the fire extinguishing apparatus 27 in the laser processing machine showing the main part of the embodiment of the present invention will be described in detail.
[0026]
1 and 2 show a fire extinguishing apparatus 27 according to the first embodiment. A processing head cover 29 that covers the brush table 19 near the periphery of the laser processing head 11 is attached to the main body frame 31 of the punch / laser composite processing machine 1. It is provided so as to be movable up and down by a fixed lift cylinder 33 for cover. The machining head cover 29 has a box shape with a downward opening. A machining head insertion hole 37 into which the laser machining head 11 can be inserted is provided in the upper cover 35 of the machining head cover 29. A heat-resistant cover brush 39 is planted downward on the entire periphery of the edge.
[0027]
A fire detection sensor 41 for detecting a fire is provided in the processing head cover 29, and the fire detection sensor 41 is electrically connected to a control device 43 described later. The fire detection sensor 41 includes a temperature sensor (heat detection machine sensor) that detects when a predetermined temperature is reached, a light sensor (light detection sensor) that detects when a predetermined light intensity is reached, There is no particular limitation. In this embodiment, a temperature sensor that detects temperatures of 60 to 130 ° C. is used.
[0028]
A fire extinguishing agent injection port 47 for injecting a fire extinguishing agent 45 into the processing head cover 29 is provided on the inner wall surface of the processing head cover 29. A fire extinguishing agent conduit 49 is provided in the fire extinguishing agent injection port 47. For example, a fire extinguisher supply device 51 such as a carbon dioxide gas cylinder or a pressure regulator (not shown) is provided. The digestive agent conduit 49 is connected between the digestive agent injection port 47 and the digestive agent supply device 51 by providing a slack with a flexible hose or the like, and follows when the processing head cover 29 moves up and down. Carbon dioxide gas, nitrogen gas, or the like can be used as the fire extinguisher 45, but is not particularly limited to the fire extinguishing gas, and may be, for example, a powder fire extinguisher.
[0029]
The control device 43 issues a command to the fire extinguishing agent supply device 51 so that the fire extinguishing agent 45 is ejected into the machining head cover 29 by the detection signal of the fire detection sensor 41.
[0030]
With the above configuration, at the time of punching, the processing head cover 29 is raised by the operation of the cover lifting cylinder 33 and positioned at the upper position of the laser processing head 11. The laser processing head 11 is also raised as necessary.
[0031]
At the time of laser processing, the processing head cover 29 is lowered and the lower end of the cover brush 39 at the opening edge comes into contact with the workpiece W. The workpiece W is covered with the brush table 19 around the laser processing head 11 by the processing head cover 29. It becomes a state. The workpiece W is moved and positioned between the brush table 19 and the heat-resistant cover brush 39 at the opening edge of the machining head cover 29, and the laser beam is applied to the workpiece W from the nozzle 53 at the tip of the laser machining head 11 in the machining head cover 29. Irradiated and laser processed.
[0032]
When the spatter scattered during the laser processing is shielded by the processing head cover 29 and falls onto the brush table 19 in the processing head cover 29, the grease or air blown oil adhering to the brush 17 ignites and a fire occurs. The temperature in the processing head cover 29 rises. The temperature sensor which is the fire detection sensor 41 detects this increased temperature, and the control device 43 instructs the fire extinguishing agent supply device 51 to eject the fire extinguishing agent 45 into the machining head cover 29 by the detection signal of the fire detection sensor 41. Is generated.
[0033]
In the fire extinguisher supply device 51, for example, carbon dioxide, which is the fire extinguisher 45, is ejected from the carbon dioxide gas cylinder through the fire extinguishing agent conduit 49 into the processing head cover 29 from the fire extinguishing agent ejection port 47. Since the inside of the processing head cover 29 is filled with carbon dioxide, the fire is extinguished.
[0034]
FIG. 3 shows a fire extinguisher 27 of a reference example, and the same parts as the fire extinguisher 27 of the first embodiment described above are omitted for explanation.
[0035]
The fire extinguishing device 27 does not use the machining head cover 29 as in the first embodiment, and is provided with a fire detection sensor 55 for detecting a fire near the nozzle 53 of the laser machining head 11. The sensor 55 is electrically connected to a control device 57 described later.
[0036]
The fire detection sensor 55 includes a temperature sensor (heat detection machine sensor) that detects when a predetermined temperature is reached, as in the first embodiment, and an optical sensor that detects when a predetermined light intensity is reached. (Light detection type sensor) and the like are not particularly limited. In this embodiment, a temperature sensor that detects temperatures of 60 to 130 ° C. is used.
[0037]
The fire extinguishing device 27 is provided with a gas supply device 59 for supplying assist gas into the laser processing head 11 and the nozzle 53. As shown in FIG. 3, the gas supply device 59 has a gas supply pipe 61 connected to the side wall of the laser processing head 11, and the rear end of the gas supply pipe 61 is a gas for switching and supplying various assist gases. It is connected to the switching device 63.
[0038]
The gas switching device 63 includes an air supply line 65 for supplying air, an oxygen gas supply line 67 for supplying oxygen gas, and a nitrogen gas supply line 69 for supplying nitrogen gas as the extinguishing agent 45. Are connected, and a switching valve 77 such as a solenoid valve 71, 73, 75 or the like is provided in each pipe line. The fire extinguishing agent 45 is not limited to nitrogen gas, and fire extinguishing gas such as carbon dioxide gas can be used.
[0039]
The control device 57 generates a command for the switching valve 77 to supply the extinguishing agent 45 into the laser processing head 11 and eject the nozzle 53 through the detection signal of the fire detection sensor 55.
[0040]
Therefore, when spatter scattered during laser processing falls on the brush table 19 and ignites the grease or air blow oil adhering to the brush 17 to cause a fire, the temperature near the laser processing head 11 rises. . The temperature sensor which is the fire detection sensor 55 detects the increased temperature, and the control device 57 instructs the fire extinguisher supply device 51 to switch the assist gas to the fire extinguishing agent assist gas by the detection signal of the fire detection sensor 55. Occurs.
[0041]
For example, the solenoid valve 73 of the oxygen gas supply pipe 67 is activated simultaneously with the operation of the solenoid valve 75 of the nitrogen gas supply pipe 69 in order to stop the supply of the oxygen gas assist gas used during the laser processing. Then, it is switched to supply nitrogen gas into the laser processing head 11, and nitrogen gas is ejected from the nozzle 53 to extinguish the fire.
[0042]
In addition, this invention is not limited to embodiment mentioned above, It can implement in another aspect by making an appropriate change. In this embodiment, the punch / laser combined machine has been described as an example, but a laser machine and a machine equipped with another laser machine may be used.
[0043]
【The invention's effect】
As can be understood from the embodiments of the invention as described above, according to the invention of claim 1, the workpiece W is laser processed in the machining head cover, and the spatter generated at this time is scattered around and shielded by the machining head cover. It falls on the brush table in the machining head cover. If a fire occurs when spatter is ignited by grease or air blow oil adhering to a heat-resistant brush table, the temperature inside the processing head cover rises, and this temperature rise can be detected by the fire detection sensor. As a result, the fire extinguisher is jetted into the processing head cover from the fire extinguisher jet port, so that the fire can be extinguished reliably.
[0045]
According to the invention of claim 2 , the effect is the same as that of claim 1, and the workpiece is laser processed in the machining head cover, and the spatter generated at this time is scattered around and shielded by the machining head cover, and the inside of the machining head cover. Fall on the brush table. When spatter ignites grease or air blow oil adhering to a heat-resistant brush table and a fire occurs, the temperature inside the processing head cover rises. Since the control device issues a command to the fire extinguisher supply device based on the detection signal of the temperature sensor, the fire extinguisher supply device injects the fire extinguishing agent into the processing head cover from the fire extinguisher injection port, so that the fire can be extinguished.
[Brief description of the drawings]
FIG. 1 shows an embodiment of the present invention and is a front view of a fire extinguisher of a first example.
2 is a plan view showing an II-II line in FIG.
FIG. 3 shows an embodiment of the present invention and is a schematic view of a fire extinguishing apparatus of a second example.
FIG. 4 shows an example of a plate material processing machine used in the embodiment of the present invention, and is a plan view of the entire punch / laser complex machine.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Punch and laser combined processing machine 11 Laser processing head 13 Center table 17 Brush 19 Brush table 27 Extinguishing device 29 Processing head cover 41 Fire detection sensor 43 Control device 45 Extinguishing agent 47 Extinguishing agent injection port 51 Extinguishing agent supply device 53 Nozzle 55 Fire detection Sensor 57 Control device 63 Gas switching device 67 Oxygen gas supply line 69 Nitrogen gas supply lines 71, 73, 75 Solenoid valve 77 Switching valve

Claims (2)

Fire extinguishing in a laser processing machine that performs laser processing by irradiating a workpiece placed on the brush table with a laser beam from a nozzle at the lower end of a laser processing head provided above a brush table having a large number of brushes implanted on the surface In the method
Cover the brush table around the laser processing head with a processing head cover, detect a fire in the processing head cover with a fire detection sensor, and spray a fire extinguishing agent into the processing head cover with the detection signal of the fire detection sensor A fire extinguishing method in a laser beam machine characterized by Fire extinguishing in a laser processing machine that performs laser processing by irradiating a workpiece placed on the brush table with a laser beam from a nozzle at the lower end of a laser processing head provided above a brush table having a large number of brushes implanted on the surface In the device
A processing head cover for covering the brush table around the laser processing head is provided, a fire detection sensor for detecting a fire is provided in the processing head cover, and a fire extinguishing agent supply device for supplying a fire extinguishing agent is provided in the processing head cover. A fire extinguishing apparatus for a laser processing machine, comprising: a control device for generating a command to the fire extinguishing agent supply device so as to eject a fire extinguishing agent into a processing head cover in accordance with a detection signal of the fire detection sensor.

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