JPS63108980A - Laser beam machine - Google Patents

Abstract

PURPOSE:To perform the certain laser beam machining by detecting photodetected light at the same time when the piercing of an object to be machined is finished by an optical sensor provided to the lower part to be machined of the object to be machined and controlling the irradiation of laser light based on this result. CONSTITUTION:When the laser light 21 is penetrated through the object 7 to be machined, the optical sensor 5 detects it. An RS flip-flop 6 is made in a reset state and the piercing time is automatically adjusted and the object to be machined is progressed to a next machining step by a detected signal from the optical sensor 5. The certain machining can be performed and a melting loss of a machining table can be prevented by the machine with this constitution.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a laser processing device that cuts a workpiece with a laser beam, and in particular is capable of detecting the laser beam that penetrates the workpiece when piercing is completed. This article relates to laser processing equipment that can be used.

[Conventional technology]

As a conventional laser processing apparatus of this type, there is one shown as a schematic configuration diagram in FIG. In the figure, a conventional laser processing device includes a numerical control section (1) that controls laser processing using numerical data, and a laser oscillation section that oscillates a laser beam (21) based on the numerical control operation of the numerical control section (1). (2) and the laser beam (21
) is refracted and guided in a predetermined direction, and a laser beam (21
) is introduced, a processing head (4) adjusts the focusing of the laser beam onto the workpiece (7), and processing is performed using the laser beam (21) focused by the processing head (4). Workpiece (7
) on which the processing table (8) is placed.

Based on the above configuration, the operation of the conventional device will be explained. First, the laser beam (21) of the laser oscillation section (2) is oscillated based on the numerical data of the numerical control section (1).

The laser light (21) emitted from this laser oscillation unit (2) is
It is reflected by a reflecting mirror (3) and transmitted to a processing lens (41) in a processing head (4). And processed lenses (
41) to focus the laser beam (21).

On the other hand, the Kenzan bottle (81) installed on the processing table (8)
) on the workpiece (7), the focus of the laser beam (21) focused by the processing lens (41) is focused on the surface of the workpiece (7), and the auxiliary gas is (
42), the workpiece (7) is processed.

Here, when cutting the workpiece (7), the laser beam (21) focused by the processing lens (41) must first penetrate the workpiece (7).

Therefore, the time required for the laser beam (21) to penetrate the workpiece (7), that is, the piercing time, is input in advance into the numerical control well section (1), and after the input and designated via-fusing time, Cutting can be performed by moving the processing head (4) or processing table (7).

[Problem that the invention seeks to solve]

Conventional laser processing equipment was configured as described above, so it was necessary to set the piercing time in advance, taking into account the thickness and material of the workpiece, and input it to the numerical control unit. There have been problems such as melting of the bottom plate of the processing table due to incorrect settings, and burning (explosion) of the workpiece if actual processing is started without penetrating the workpiece.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a laser processing device that can reliably perform piercing without setting a piercing time according to the workpiece in advance.

[Means for solving problems]

The laser processing apparatus according to the present invention has a detection means for detecting the transmission of laser light at the end of the piercing process of the workpiece, and is configured to control the irradiation of the laser light based on the detection result of the detection means. .

[Effect]

The detection means in this invention detects the transmission of laser light that occurs when piercing ends, and automatically adjusts the piercing time.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG.

FIG. 1 shows a schematic circuit block diagram of the apparatus of this embodiment, and in the figure, the laser processing apparatus according to this embodiment includes a numerical control section (1) that controls laser processing using numerical data;
A laser oscillation section (2) that oscillates a laser beam (21) based on the numerical control operation of the numerical control section (1); a reflecting mirror (3) that refracts and guides in the direction;
The laser beam (21) resulting from the refraction deriving operation of 3) is introduced, and the processing head (4) adjusts the focusing of the laser beam onto the workpiece (7), and the processing head (4) adjusts the focusing. a light detection sensor (5) that detects by the transmission of the laser light (21) that the piercing process is completed by penetrating the workpiece (7) with the laser light (21); ) is input as a reset signal, and the laser oscillation command signal of the numerical control section (1) is input as a set signal to control the oscillation operation of the laser oscillation section (2).
It is configured to include an S flip-flop (6) and a processing table (8) on which a workpiece (7) to be processed with the laser beam (21) focused by the processing head (4) is placed. be.

Next, the operation of this embodiment based on the above configuration will be explained. First, a laser oscillation unit (2) oscillates a laser beam (21) based on a laser oscillation command from a numerical control unit (1), and this laser beam (21) passes through a reflecting mirror (3) to a processing head (4). ) is introduced within. The laser beam (21) focused by the processing lens (5) of this processing head (21) is focused on the surface of the workpiece (7), and the auxiliary gas (4)
2) melting the workpiece (7) by supplying;
Then, the workpiece (7) is penetrated as the first step of processing.

If this light detection sensor (5) does not detect the laser beam (21), it means that the laser beam (21) has not yet penetrated the workpiece (7), so in this case, the laser beam (21) is not detected. Continue to irradiate (21).

As a result, when the laser beam (21) penetrates the workpiece (7), the light detection sensor (5) can detect this penetrating light as a signal. The detection signal from this light detection sensor (5) causes the RS flip-flop (6
), the piercing time can be automatically adjusted, and you can proceed to the next step.

A thermistor, thermocouple, photodiode, etc. can be used as the light detection sensor (5).

Note that in the above embodiment, the light detection sensor (5) is directly provided under the workpiece (7), but it is also possible to insert a laser beam between the workpiece (7) and the light detection sensor (5). It is also possible to provide a protective plate (protective film) that transmits or easily conducts the temperature rise due to piercing of the workpiece (7), and in this case, spatter caused by piercing of the workpiece (7) can be provided. It is possible to prevent malfunction of the light detection sensor (5) due to

In the above embodiment, the light detection sensor (5) was configured to be fixedly projected at the bottom of the workpiece (7), but when the laser head (4) moves and the piercing operation of each part It can also be configured to move in conjunction with each other.

〔Effect of the invention〕

As described above, the laser processing apparatus according to the present invention has a detection means for detecting the transmission of laser light at the end of the piercing process of the workpiece, and controls the irradiation of the laser light based on the detection result of the detection means. With this configuration, it is possible to automatically adjust the piercing time by detecting the transmission of laser light that occurs at the end of piercing, which prevents the bottom plate of the processing table from melting, prevents burning of the workpiece, and ensures reliable operation. It has the effect of being able to perform piercing. This reliable piercing reduces machining time.

[Brief explanation of the drawing]

FIG. 1 is a schematic circuit block diagram of a laser processing apparatus according to an embodiment of the present invention, and FIG. 2 is a schematic block diagram of a conventional apparatus. (1) Two-numeric control unit (2): Laser oscillation unit, (3): Reflection mirror, (4): Processing head, (5): Photodetection sensor, (6): RS flip-flop. Note that the same reference numerals in the figures indicate the same or equivalent parts. Agent Masuo Oiwa Figure 1 Figure 2 F1 Procedural amendment (voluntary) Showa year Month Date 2 (J d

Claims (4)

[Claims] (1) A laser processing device that processes a workpiece with a laser beam, which includes a detection means that is installed at the lower part of the workpiece and detects the transmission of the laser beam when the piercing process of the workpiece is completed. , A laser processing apparatus characterized in that it is configured to control the irradiation of laser light based on the detection result of the light detection means. (2) The detecting means is configured to detect the laser light generated when the piercing process is completed through a protective plate that transmits the laser light between the detecting means and the workpiece. Laser processing equipment. (3) The laser processing apparatus according to claim 1 or 2, wherein the detection means is constituted by an optical sensor. (4) The laser processing apparatus according to claim 1 or 2, wherein the detection means is constituted by a temperature sensor.