JPH0592287A - Device for intercepting laser beam in laser beam machine - Google Patents

Abstract

PURPOSE:To utilize at the field for intercepting the way of a laser beam outputting toward the member to be machined without stopping the oscillating operation of a laser beam oscillator. CONSTITUTION:A rotary motion of a rotary actuator 6 is converted to the front and back directional straight motion of a reflecting mirror 8, the reflecting mirror 8 is advanced in the optical axis of a laser beam L oscillated from the laser beam oscillator 9 with the rotary motion of the rotary actuator 6 and the laser beam L is refracted and intercepted, an absorbing plate 10 for absorbing the laser beam L on the optical axis of the above refracted and intercepted laser beam L1 is provided. The laser beam can be intercepted in high speed and opened on the way of the laser beam outputting.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention cuts off the laser light oscillated by a laser oscillator of a laser processing machine, without stopping the oscillating action of the laser oscillator, to interrupt the laser light output toward a workpiece. The present invention relates to a blocking device that prevents laser light from reaching a work piece.

[0002]

2. Description of the Related Art In the case of forming shoes and suit patterns with a laser beam machine, as shown in FIG. 2, a laser beam is moved to a pattern member 1 along a predetermined processing locus 2 at a constant speed, and the intensity of the laser beam is increased. The pattern paper member 1 is cut by the collected heat energy, but the processing locus 2 may be a curve or a straight line facing the moving direction of the laser beam, but the processing locus 2 is an acute angle from one point 2a thereof. If the laser light is inverted, the laser beam will be
As a result, even if the laser beam moves at a constant speed, the laser light reaches the point 2a and then stops at that point 2a in order to be inverted from the point 2a. As described above, the focused heat energy of the laser light is extremely strong, so that the point 2a
There is a problem that it burns out more than necessary. Figure 3
The phenomenon is shown in.

Since stopping the oscillating action of the laser oscillator during the working operation lowers the work efficiency,
Such a phenomenon is considered to be inevitable, and it was designed to avoid the above-mentioned inversion locus during laser processing. Of course, it is conceivable to block the oscillating laser light with an appropriate blocking plate, but how to achieve the processing of the blocked strong laser light and the instantaneous blocking opening speed remains an unsolved problem. ing.

[0004]

SUMMARY OF THE INVENTION Therefore, according to the present invention, the output of the laser light is rapidly interrupted without stopping the oscillation action of the laser light during the processing work in the laser processing machine, and the laser light The purpose is to perform good processing.

[0005]

In order to solve the above-mentioned problems, according to claim 1 of the present invention, a rack 4 is provided on a support arm 3 and a pinion 5 meshing with the rack 4 is provided. The rotary motion of the rotary actuator 6, which is attached to the rotary actuator 6, is converted into a linear motion in the front-rear direction of the support arm 3 held by the linear guide 7 by the transmission mechanism including the rack 4 and the pinion 5, and the support arm 3 receives the rotary motion. A reflecting mirror 8 is attached, and the rotating movement of the rotary actuator 6 causes the reflecting mirror 8 to move forward in the optical axis of the laser beam L oscillated from the laser oscillator 9 to refract the laser beam L.
The absorption plate 10 for absorbing the laser light is installed on the optical axis of the refracted laser light L1.

According to a second aspect of the present invention, the rotary actuator 6 is a pulse excitation type solenoid.

In the third aspect, the absorbing plate 10
The cooling jacket 11 is built in the device, and the configuration according to claim 1 or 2 is adopted.

[0008]

In the first aspect of the present invention, the rotary movement of the rotary actuator 6 causes the reflecting mirror 8 supported by the linear guide 7 to move forward into the optical axis of the laser beam L output from the laser oscillator 9. Thus, the laser light L is refracted, the irradiation of the laser light to the workpiece W is blocked, and the refracted laser light L1 is absorbed by the absorption plate 10. Further, when the reflection mirror 8 reaches the forward end, the rotary solenoid 6 is instantaneously reversed and the reflection mirror 8 is retracted to open the interruption of the laser beam L and continue the irradiation of the workpiece W again. ..

That is, for example, as shown in FIG. 3, when the laser light reaches a point 2a at which the machining locus 2 is inverted in an acute angle, the irradiation of the laser light is instantaneously interrupted, and the laser light is emitted during the subsequent inversion. By continuing again
Since the condensed heat energy of the laser light is not concentrated on the point 2a, the point 2a is not burned off more than necessary.

According to claim 2, since the rotary actuator 6 is a pulse excitation type solenoid,
At a low frequency of up to 2000 Hz, the rotary actuator 6 can be rotated in the normal and reverse directions for each pulse width of one frequency, and the reflection mirror 8 can be rotated between 0.001 and 0.00.
It is possible to open and close in an extremely high speed range of 05 seconds.

In the third aspect, the absorbing plate 10
Since the cooling jacket 11 is built in the absorption plate 10, even if it receives the very strong heat energy of the laser beam,
Will not be overheated and will absorb the heat energy well.

[0012]

FIG. 1 shows a laser beam machine of, for example, a driving power of 100 W according to an embodiment of the present invention, in which a laser beam L (optical diameter 8 mm) output from a laser oscillator 9 is focused on the optical axis. An optical lens (processing head) 12 is provided to collect the light and increase the thermal energy density so that the work W is irradiated and processed.

On the other hand, a linear guide 7 composed of a ball bearing mechanism or the like is fixed to a vertical frame 13a of a machine frame 13 provided on a side surface of a straight path of the laser light L, and a support arm 3 is attached to the linear guide 7 to the optical axis of the laser light L. A rack 4 is fixed to the support arm 3 by being held so as to be able to move forward and backward orthogonally to. Also machine frame 13
The rotary actuator 6 is fixed to the horizontal frame 13b, the pinion 5 is fixed to the rotary shaft 6a, and the pinion 5 is meshed with the rack 4. Rotary actuator 6
Is a pulse excitation solenoid, for example 190H
It is preferable to use a low frequency of z / s, which is forward / reverse (oscillating back and forth) within a range of a rotation angle of 28 ° for each frequency (manufactured by General Scanning Co., Ltd.). In addition to this, as the rotary actuator 6, a pulse excitation solenoid of 100 to 2000 Hz / s can be used.

A reflection mirror 8 tilted at an angle of 45 ° with respect to the optical axis of the laser light L is fixed to the tip of the support arm 3, and the machine frame 1 is provided on the side surface of the straight path of the laser light L.
3, a machine base 14 is installed on the opposite side of the straight path of the laser light L with respect to 3, and an absorption plate 10 is fixed to the machine base 14 so as to face the reflection mirror 8 and inside the absorption plate 10. Cooling jacket that makes the water pipe meander 1
1 is built in. A graphite plate is used as the absorption plate 10.

Therefore, by operating the laser oscillator 9 to cause an oscillating action and outputting the laser beam L toward the workpiece W, the pattern member 1 as shown in FIG.
On the other hand, the shearing work is performed at a constant speed along the machining locus 2, but when the laser beam reaches one point 2a of the reversal position of the machining locus 2, a pulse signal indicating that the one point 2a is reached is output to the rotary actuator. When it is received by 6, the reflecting mirror 8 is immediately excited to move forward, block the straight path of the laser beam L, block the laser beam L from reaching the workpiece, and block the blocked laser beam L. Is refracted at a right angle to the reflection mirror 8 and the refracted laser light L1 hits the absorption plate 10, its heat energy is absorbed by the absorption plate 10, and the absorption plate 10 heated by the absorption of this heat energy is cooled by the cooling jacket 11. It is cooled to the end and is not overheated.

As described above, even when the laser light reaches the above-mentioned one point 2a and the movement of the laser light is momentarily stopped at the point 2a when the laser light is reversed, the irradiation of the laser light is interrupted when the laser light is instantaneously stopped. Therefore, the point 2a is not burned out excessively, and by moving the laser light at a constant speed,
It is possible to accurately perform shearing processing on the entire area of the processing locus 2 with uniform thermal energy.

Moreover, a moment after the laser light is cut off, the reflecting mirror 8 moves backward at a high speed of, for example, 0.001 to 0.0005 seconds, and the irradiation of the laser light on the workpiece is restarted. Does not hinder the processing work. In addition, in order to further bring the reflecting mirror 8 to a high speed, it can be achieved by increasing the radius R of the pinion 5 and increasing the peripheral speed of the pinion 5.

[0018]

According to the first aspect of the present invention, in the laser processing, when the laser light is irradiated while being moved at a constant speed on the work to be sheared, the movement of the laser light is momentarily stopped. Since the output of the laser light can be interrupted and released at high speed without stopping the oscillation action of the laser oscillator, the condensed heat energy of the laser light is not locally concentrated on the workpiece. Therefore, accurate laser processing can be performed without excessively burning the workpiece.

Further, since the laser light is blocked by the reflection mirror during the output from the laser oscillator, even when the diameter of the laser light is large,
That is, even when the driving power of the laser oscillator exceeds 100 W, the laser power can be reliably cut off.

Furthermore, the laser beam that is blocked and refracted by the reflection mirror is well absorbed by the absorption plate, which is safe.

According to the second aspect of the invention, since the rotary actuator is a pulse excitation type solenoid, it is possible to rotate the rotary actuator in the forward and reverse directions for each pulse width of one frequency. It is possible to operate so as to cut off and open at an extremely high speed without stopping during movement on the workpiece, and accurate laser processing can be performed.

According to the present invention, the absorbing plate is not excessively heated even if it receives a very strong heat energy of the laser beam, and it can withstand a long time of use sufficiently and is safe. ..

[Brief description of drawings]

FIG. 1 is a perspective view showing an entire embodiment of the present invention.

FIG. 2 shows an example of a processing locus at the time of laser processing of a workpiece.

FIG. 3 is an enlarged view of part A in FIG.

[Explanation of symbols]

 1 Pattern paper member 2 Processing trajectory 2a One point of processing trajectory 3 Support arm 4 Rack 5 Pinion 6 Rotary solenoid 7 Linear guide 8 Reflecting mirror 9 Laser oscillator 10 Absorbing plate 11 Cooling jacket 12 Condensing lens L Laser light L1 Laser light

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Reference number within the agency FI technical display location H01S 3/10 Z 8934-4M (72) Inventor Noboru Watanabe 1-9-1 Jokoji, Amakosaki, Hyogo Prefecture No.Osaka Fuji Industry Co., Ltd.

Claims (3)

[Claims] 1. A rack is provided on a support arm, a pinion meshing with the rack is attached to a rotary actuator, and a rotary motion of the rotary actuator is held in a linear guide by a transmission mechanism including a rack and pinion. And a reflecting mirror is attached to the supporting arm, and the reflecting mirror is advanced by the rotary movement of the rotary actuator into the optical axis of the laser beam output from the laser oscillator to refract the laser beam. A laser light blocking device in a laser processing machine, wherein an absorption plate that absorbs laser light is installed on the optical axis of the refracted laser light. 2. The laser light blocking device in the laser beam machine according to claim 1, wherein the rotary actuator is a pulse excitation solenoid. 3. The laser light blocking device in a laser beam machine according to claim 1, wherein the absorption plate has a cooling jacket built therein.