JPH0592288A - Device for intercepting laser beam in laser beam machine - Google Patents

Abstract

PURPOSE:To utilize at the field for intercepting the way of the laser beam outputting toward the member to be machined without stopping the oscillating operation of the laser oscillator. CONSTITUTION:The 1st and the 2nd reflecting mirrors 4, 5 are provided on the outputting way of the laser beam ejected from the laser beam oscillator 3, the 1st reflecting mirror 4 among these is supported in freely swinging with a rotary actuator 6, the 2nd reflecting mirror 5 is supported to the definite direction in the fixed state, and an aperture 7 is provided on the outputting way of the laser beam reflected and refracted with the 2nd reflecting mirror 5, and a laser beam absorbing plate 8 for receiving the laser beam reflected and refracted with the above 1st reflecting mirror 4 is provided. The laser beam can be high speed intercepted and opened on the outputting way of the laser beam.

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. 3, 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
Even if the laser beam is moving at a constant speed along the line, the laser beam eventually reaches the point 2a, and then the laser beam is inverted at the point 2a, so that the movement is stopped at 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 4
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, if indicated by a reference numeral, the laser light output from the laser oscillator 3 is in the process of being output. First and second reflection mirrors 4 and 5 for staggering and reflecting the light are provided, and the first reflection mirror 4 can freely change the refraction angle of the laser light reflected and refracted by the first reflection mirror 4. It is rotatably supported by a rotary actuator 6, and the second reflection mirror 5 is fixedly supported so that the output direction of the laser light reflected and refracted by the second reflection mirror 5 is directed in a fixed direction. Of the laser light which is reflected and refracted by the reflection mirror 5 of the first reflection mirror 5 and which is reflected and refracted by the aperture 7 at the swinging end or the swinging end of the first reflecting mirror 4. It is to adopt installed formed by constituting the laser light absorbing plate 8 to undergo.

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

Further, in the third aspect, the absorbing plate 8
The cooling jacket 9 is built in the device, and the configuration according to claim 1 or 2 is adopted.

[0008]

According to the first aspect of the present invention, during the laser processing operation, the laser beam L1 output from the laser oscillator 3 is reflected and refracted in a staggered manner by the first and second reflecting mirrors 4 and 5, and the aperture is opened. The effective laser beam L2 passing through the hole 7a when hitting the focusing lens 7 is known as the condensing lens 10
The workpiece W is focused on the (machining head) to irradiate the workpiece W, and in this state, the cutting work is performed by moving along the machining trajectory 2 described above, but the laser beam L2 is at the reverse position of the machining trajectory 2. Upon reaching (the above-mentioned one point 2a), the rotary actuator 6 is excited in response to the signal, the first reflecting mirror 4 is swung to one side, and the refraction angle of the laser beam L1 reflected and refracted by this is changed. At the very least, the irradiation of the laser light to the workpiece W is blocked and the laser light L
1 is reflected toward the laser light absorption plate 8 and the laser light L1 is absorbed therein. Then, after a moment of interruption of the laser beam to the workpiece W, the rotary actuator 6 swings in the reverse direction in the original direction, and the laser beam L1 irradiates the workpiece W again via the second reflecting mirror 5 and the aperture 7. It will be.

That is, for example, as shown in FIG. 4, when the laser light reaches a point 2a at which the machining trajectory 2 is inverted in an acute angle, the irradiation of the laser light is interrupted momentarily, and the laser light of the laser light is momentarily inverted after that. By continuing the irradiation again, one point 2 of the processing locus 2 during the movement of the laser beam
Since the condensed heat energy of the laser light is not concentrated on a, the point 2a is not burned out more than necessary.

According to claim 2, since the rotary actuator 6 is a pulse excitation type solenoid,
At a low frequency of ˜2000 Hz, it is possible to rotate the rotary actuator 6 in the forward and reverse directions for each pulse width of one frequency, and the first reflection mirror 4 is 0.001 to 0.001.
It is possible to open and close in an extremely high speed range of 0.0005 seconds.

Further, according to the present invention, since the absorbing plate 8 has the cooling jacket 9 built therein, the absorbing plate 8 is excessively heated even if it receives a very strong thermal energy of the laser beam. The heat energy is absorbed well.

[0012]

FIG. 1 shows a laser processing machine of, for example, a driving power of 100 W according to an embodiment of the present invention, in which a laser beam L1 (light diameter 8 mm) output from a laser oscillator 3 thereof.
A first reflecting mirror 4 that is swung left and right by a rotary actuator 6 is installed on the optical axis of the, and the swinging end of the first reflecting mirror 4 that is swung either left or right, for example, clockwise. At the second reflection mirror 4, the second reflection mirror 5 receives the laser light L1 that is reflected and refracted by the first reflection mirror 4 and reflects and refracts the laser light L1 in a staggered manner. The laser light L2 that is reflected and refracted by is fixedly provided so as to face a certain direction. An aperture 7 is installed on the way of the output of the laser light L2, and the aperture 7 has a well-known structure, and the laser light of the laser light L2 on the outer peripheral side where the output is weak passes through the aperture 7. Only the central laser beam L2 having a strong output is passed through the hole 7a, and the laser beam L2 passing through the hole 7a is condensed by the condenser lens 10 (processing head) to generate thermal energy. And then the workpiece W is irradiated. A laser light absorption plate 8 for receiving the laser light L1 which is reflected and refracted by the first reflection mirror 4 at the swing end where the first reflection mirror 4 swings counterclockwise from the swing end.
Is provided so as to face the first reflection mirror 4, and a cooling jacket 9 that makes the water pipe meander is built in the absorption plate 8. A graphite plate is preferably used as the absorption plate 8.

The rotary actuator 6 uses a pulse-excited solenoid, and has a low frequency of, for example, 190 Hz / s, and performs normal and reverse rotation (reciprocating oscillation) within a range of a rotation angle of 28 ° for each frequency (General Scanning Co., Ltd.). Manufactured) is used. The laser light L1 reflected and refracted at the clockwise swing end of the first reflection mirror 4 hits the second reflection mirror 5, and the laser light L2 reflected and refracted by the second reflection mirror 5 of the aperture 7. Hole 7a
In order to move the laser beam L2 away from the second reflecting mirror 5 and move to the laser absorbing plate 8 side as quickly as possible from the state of irradiating the workpiece W through the laser beam, the driving speed of the rotary actuator 6 is increased. At the same time, needless to say, it is preferable that the peripheral speed at which the laser light moves from the second reflecting plate 5 to the laser absorbing plate 8 is high.

For example, the rotary actuator 6 has a low frequency of 190 Hz / s, and the rotation angle is 2 for each frequency.
1 if it rotates forward and backward (reciprocating swing) in the range of 8 °
Although it oscillates reciprocally within a range of a rotation angle of 28 ° in 1/90 second, this speed is not sufficient as a laser light blocking speed, and a rotation angle of 28/1000 at a speed of at least 1/1000 second. If it is necessary to oscillate reciprocally within a range of 10 mm at intervals of 10 mm, the distance L between the first reflecting mirror 4 and the second reflecting mirror 5 shown in FIG. 2 is obtained by the following calculation formula. be able to.

28 ° × 2 × 190 = 10640 ° / sec v = 10640 × π ÷ 180 = 185.6 rad / se
c V = 10 mm × 2 × 1000 Hz / sec = 20000 mm / sec Here, since v = V, V = L × θ mm / se
Since it is c, 20000 mm / sec = L × 185.6 rad / se
c L = 107.76 mm.

Therefore, by setting the distance L to 107.7 mm, it is possible to switch the irradiation state of the laser beam L2 to the workpiece W from the irradiation state to the interruption state to the irradiation state at a speed of 1/1000 second. You can do it.

That is, at the swinging end of the first reflection mirror 4 in the clockwise direction, the laser beam L1 is reflected and refracted toward the second reflection mirror 5, and the laser beam L2 is apertured by the second reflection mirror 5. 7 and condenser lens 1
The workpiece W is irradiated with light passing through 0, and in this state, the laser light L2 is moved along the processing locus 2 as shown in FIG. 3, and when the laser light L2 reaches the inversion position 2a, the pulse signal is received. The rotary actuator 6 swings counterclockwise, and the laser beam L1 is moved at a speed of 1/1000.
Moves to the laser light absorbing plate 8 side to block the irradiation of the laser beam L2 to the workpiece W, and swings from the blocked position to the open position. Cut off laser light L1
Hits the absorption plate 8, the heat energy is absorbed by the absorption plate 8, and the absorption plate 8 heated by the absorption of this heat energy is cooled by the cooling jacket 9 and is not excessively heated.

As described above, the laser beam L2 is emitted at the point 2a.
Even if the movement of the laser beam L2 is momentarily stopped at the point 2a during the reversal movement, the irradiation of the laser beam L2 is interrupted at that momentary stop, so the point 2a is excessively burned out. Therefore, by moving the laser beam L2 at a constant speed, it is possible to accurately perform shearing processing on the entire region of the processing locus 2 with uniform thermal energy.

Moreover, a moment after the laser light L2 is cut off, the irradiation of the laser light L2 onto the work piece is restarted at a high speed of, for example, 0.001 to 0.0005 seconds. It will never come.

[0020]

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.

Moreover, 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 light 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 forward and backward for each pulse width of one frequency. In the course of movement on the workpiece, it is possible to operate so as to interrupt and open at extremely high speed without stopping on the processing locus, and accurate laser processing can be performed.

Further, according to claim 3, the absorbing plate is not excessively heated even if it receives a very strong thermal 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 is a plan view of relevant parts for explaining the operation of the present invention.

FIG. 3 shows an example of a processing locus during laser processing of a workpiece.

FIG. 4 is an enlarged view of a portion A in FIG.

[Explanation of symbols]

 1 pattern paper member 2 processing locus 2a one point of processing locus 3 laser oscillator 4 first reflecting mirror 5 second reflecting mirror 6 rotary solenoid 7 aperture 8 laser absorbing plate 9 cooling jacket 10 condensing lens L1 laser light L2 laser light

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Noboru Watanabe 1-9-1 Jokoji Temple, Amagasaki City, Hyogo Prefecture Osaka Fuji Industrial Co., Ltd.

Claims (3)

[Claims] 1. A first and a second reflection mirror for reflecting and refracting the laser light in a zigzag manner are provided in the course of outputting the laser light output from the laser oscillator, of which the first reflection mirror is It is swingably supported by a rotary actuator so that the refraction angle of the reflected and refracted laser light can be freely changed, and the second reflection mirror is arranged so that the output direction of the laser light reflected and refracted by it is directed in a fixed direction. It is supported in a fixed state, and an aperture is installed in the middle of outputting the laser light reflected and refracted by the second reflecting mirror, and is reflected on the first reflecting mirror at the swinging end or at its swinging end. A laser light blocking device in a laser processing machine, which is provided with a laser light absorbing plate for receiving a 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.