JPH02307693A - Laser beam working method and laser beam nozzle device used for its method - Google Patents

Abstract

PURPOSE:To obtain plural pieces of products by single working by interposing oil between plural plates as needed, providing a spring between a nozzle body and a work holding body, and executing laser beam working by pressing the surface of the plate by a work holding device. CONSTITUTION:A distance between a blowout hole 27 of the tip of a nozzle body 23 and the upper face of a work W is set to a prescribed interval. When the nozzle body 23 descends, a work holding body 29 provided through a spring 38 on the nozzle body 23 also descends. After it abuts on the work W, the spring 37 is compressed, and by its repulsive force, the upper face of the work W is pressed through a free bearing 31. Together with adherence by oil 43 between plates, the plates are brought to press-contacting, and peeling-off of the plates is prevented. Subsequently, from the blowout hole 27 formed in the tip of the nozzle body 23, a laser beam LB is radiated to the work W together with assist gas. In such a way, plural products are obtained by single laser beam working, and the productivity is improved by shortening the working time.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a laser processing method and a laser beam nozzle device used in this laser processing method.

(Prior Art) Conventionally, laser processing equipment has a laser beam nozzle, and generally, the laser beam nozzle irradiates the workpiece with a laser beam and at the same time injects assist gas to achieve efficient and good laser beam processing. was being carried out. Generally, one product was made in one cutting process.

(Problems to be Solved by the Invention) By the way, in the conventional laser processing apparatus described in (a) above, it usually takes a lot of time and cost to perform laser cutting processing. Recently, there has been an increase in the number of users who use laser processing for right roots, decorative items, shim plates, steel frame parts, etc.
Although such products do not require much roughness or precision of the cut surface, one product is produced by one cutting process. Therefore, there was a problem that processing costs could not be reduced and productivity could not be improved.

The purpose of this invention is to solve the above-mentioned problems by polymerizing a plurality of plate materials and producing a plurality of products with one laser cutting process, thereby reducing processing costs and increasing productivity. An object of the present invention is to provide a method and a laser beam nozzle device used in the method.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the present invention irradiates a laser beam from a laser beam nozzle device onto a plurality of overlapping plate materials placed on a work table. This is a laser processing method in which laser processing is performed while pressing the polymerized plate material with a work holding device provided in the laser beam nozzle device.

Further, in this laser processing method, it becomes even better if the laser processing is performed in a state where oil is applied between the plurality of overlapped plates to bring them into close contact.

Further, the present invention provides a work holding device having a nozzle body that irradiates a laser beam and spouts out assist gas, and a work holding body provided movably in the axial direction around the outer periphery of the nozzle body; A laser beam nozzle device in a laser processing device is configured by including a nozzle body and a bullet interposed between the workpiece holding body of the workpiece holding device.

(Function) By employing the laser processing method of the present invention, the surface of the plurality of overlapping plates placed on the work table is pressed by the work holding device provided in the laser beam nozzle device, and in this state, the laser Additions are made. Since the plurality of superposed plate materials do not shift from each other, a plurality of products can be obtained with high precision by one laser processing.

Further, in the above laser processing method, if oil is applied between the plurality of polymerized plate materials and laser processing is performed in a state in which they are in close contact with each other, even higher precision can be obtained.

Furthermore, by employing the laser beam nozzle device in the laser processing apparatus of the present invention, the surface of the plate material being laser processed is pressed by the elastic horn of the bullet provided between the nozzle body and the work holding body. A plurality of plates can be reliably brought into close contact and floating can be prevented.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

Referring to FIG. 3, the laser processing apparatus 1 guides a workpiece W onto a fixed XY table 3 laid horizontally, and thermally cuts the workpiece W with a laser beam LB.

The laser beam LB is generated by a laser beam generator 5, and is sent to the processing head 11 via an intensity adjustment device 7 and a reflecting mirror 9.
are guided by. A condensing lens 13 is provided inside the processing head 11, and the laser beam LB is condensed by the condensing lens 13, and a plate material (hereinafter referred to as a work) W is thermally cut at the condensing position. Further, the workpiece W is held by a clamp 15 and moved horizontally by an XY double 3'' so that the position to be cut is directly below the processing head 11.

The clamp 15 is configured to be driven in the X and Y directions on the XY-axis servo motor plane while gripping the workpiece W. The processing head 11 is driven in the vertical direction by a Z-axis circumferential servo motor. Further, the laser processing device 1 is equipped with an NC device @17, and the operation section of the NC device 17 is equipped with a so-called manual pulse generator 19.

At the tip of the processing head 11, a laser beam nozzle device 21 according to this embodiment as shown in FIGS. 1 and 2 is attached. Note that FIG. 1 shows the state during laser processing, and FIG. 2 shows the state in which the suppression is released.

The laser beam nozzle device 21 includes a cylindrical nozzle body 23
and a work holding device 25 provided around the outer periphery of the nozzle body 23.

The nozzle body 23 has an ejection hole 27 formed at its tip (lower side in FIG. 1), and a laser beam LB together with an assist gas is irradiated from the ejection hole 27 toward the workpiece W.

The work holding device 25 has a cylindrical work holding main body 29 attached to the outer periphery of the nozzle main body 23.
It is movable in the axial direction of 3. A plurality of free bearings 31 each having a hard rubber ball or the like, for example, are embedded in the lower surface of the work holding main body 29 on the same circumference with their spherical surfaces protruding. In addition, free bearing 3
The workpiece W can be held more uniformly by arranging a large number of them so that they are close to surface contact.

Further, a plurality of bullets 3 are disposed between the upper surface of the work holding body 29 and the spring receiver 35 provided on the nozzle body 23.
7 is provided, and is always biased to press the work holder main body 29 downward. In addition, the work holder main body 2
9 to prevent it from descending and separating from the nozzle body 23.
As shown in the figure, the stepped portion 39 of the work holding device 29 and the stepped portion 41 of the nozzle main hole 23 are removed by a predetermined amount from the work holding main body 2.
9 comes into contact with the lower part and stops.

On the other hand, there is oil 4 between the plate materials W1 and W2, which are the work W.
3 is applied to the plate surface by spraying or the like. By the way, although this example shows an example in which two plates are polymerized, there is no limit to the number of thin plates.

In the above configuration, when the laser beam is lowered onto the workpiece W polymerized by the oil 43, the workpiece holding device 25 shown in FIG. Nozzle 2 at the tip of 23
7 and the upper surface of the workpiece W is set to a predetermined interval.

(See Figure 1) By lowering the nozzle body 23,
The work holding body 29 of the work holding device 25 provided on the nozzle body 23 via the bullet 37 also descends, comes into contact with the work W, compresses the bullet 37 by a required amount, and is released by the elastic force of the bullet 37. The upper surface of the workpiece W is pressed through the bearing 31. Therefore, together with the close contact between the plates due to the oil 43, the plates can be crimped, preventing the plates from peeling off, making it possible to obtain multiple products with one laser process, and shortening the processing time. This not only improves productivity but also reduces processing costs.

Note that this invention is not limited to the embodiments described above, but can be implemented in other forms by making appropriate changes.

[Effects of the Invention] As can be understood from the above description of the embodiments, according to the present invention, oil is interposed between a plurality of plate materials as necessary, and a bullet is inserted between the nozzle body and the workpiece holder body. Laser processing is performed by pressing the surface of the plate with a workpiece holding device. Multiple products can be obtained with one laser processing, reducing processing time and increasing production. In addition to improving the properties, it is also possible to reduce processing costs.

By using this laser nozzle device, a plurality of overlapping plates are reliably pressed during laser processing, so that the plates do not float or shift.

[Brief explanation of the drawing]

1 and 2 show the main parts of this invention, FIG. 1 is an enlarged cross-sectional view of the part shown by the ■ arrow in FIG. 3, and FIG.
FIG. 3 is an enlarged sectional view showing a released state of the work holding device at the same location as in the figure, and FIG. 3 is a side view of a laser processing apparatus according to an embodiment of the present invention. 1... Laser processing device 21... Laser beam nozzle device 23... Nozzle body 25... Work holding device 29... Work holding body 37... Bullet machine 43... Oil agent Patent attorney Hidekazu Miyoshi 1... Laser processing device 21... Laser beam nozzle device 23... Nozzle body 25... Work holding device 29... Work holding body 37... Bullet machine 43... Oil Figure 1

Claims (3)

[Claims] (1) When performing laser processing by irradiating a laser beam from a laser beam nozzle device to a plurality of overlapping plate materials placed on a work table, the work holding device provided in the laser beam nozzle device holds the overlapping sheet materials together. A laser processing method characterized by performing laser processing while pressing. (2) The laser processing method according to claim 1, characterized in that the laser processing is performed in a state in which oil is applied between the plurality of superposed plates to bring them into close contact. (3) a work holding device having a nozzle body that irradiates a laser beam and blows out an assist gas; a work holding body disposed around the outer periphery of the nozzle body so as to be movable in the axial direction thereof; 1. A laser beam nozzle device for a laser processing device, comprising: a bullet interposed between a workpiece holding body of a workpiece holding device.