JPH0545358B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to an irradiation head that utilizes laser beams, and in particular to an irradiation head for removing large cut pieces in a predetermined shape from a workpiece by intersecting a plurality of laser beams. Relating to a laser irradiation head.

BACKGROUND ART There is a process in which a V-shaped cut groove is formed on a workpiece and the cut groove is removed as a cut piece of a predetermined shape.

Conventionally, in this type of processing, a single laser beam is used to make a cutting line in the workpiece at a predetermined depth, and then the relative angle between the laser beam and the workpiece is changed to cut the workpiece first. Make a cut line at a different angle to the bottom and remove the cut piece, or set up two fixed laser beams at right angles to each other and tilt, rotate, or move the respective focal points. The cut pieces are removed by applying it to a workpiece supported by means.

However, in the former processing method, in addition to the hassle of setup change, two cutting operations are required, resulting in poor work efficiency. In addition, the latter method does not allow grooving or hole machining, so there is a limit to its practical versatility.

OBJECTS OF THE INVENTION Accordingly, an object of the present invention is to provide a laser processing head that can continuously remove cut pieces of a predetermined shape from a workpiece in a single process.

Solution to the Invention Therefore, the present invention provides a method for attaching a laser beam focusing means to one of two axes that intersect with each other, a first axis, and attaching a second focusing means to the other second axis. The first and second axes are attached at an intersecting angle and are rotatable toward the intersection of the first and second axes, and the laser beams are directed to the condensing means of the first and second axes.
The robot is guided toward the intersection of the axis and the second axis.

During processing, by rotating the second focusing means about the first axis and independently about the second axis, the two laser beams are directed toward the workpiece. Form a V-shaped cutting line,
A cut piece of a predetermined shape is separated from the part.
In this way, cut pieces of a predetermined shape are continuously formed from the workpiece.

Note that the rotation of the first axis is for always setting the laser beam of the second focusing means in the normal direction along the processing trajectory, and the rotation of the second focusing means about the second axis is The rotation is for setting the cutting angle of the V-groove cutting line.

Configuration of the Embodiment FIG. 1 shows a multi-laser irradiation head 1 of the present invention. The multi-laser irradiation head 1 is composed of a first rotating bracket 2 and a second rotating bracket 3 as a whole.

The first rotating bracket 2 has a predetermined shape,
It is formed in a hollow shape, and its upper end portion is fixed to the lower end portion of the first hollow shaft 4, and the upper and lower ball bearings 5
It is supported by the support frame 6 so as to be rotatable about the first axis A. The first hollow shaft 4 is driven by an external first servo motor 9 via a worm 7 and a worm wheel 8 inside the support frame 6.

Further, the first rotating bracket 2 concentrically fixes the sleeve 10 at its lower end on the axis of the first axis A, and the first condensing means 11 including a condensing lens etc. is fixed at its lower end. keeping. Note that this sleeve 10 has a transflective mirror 12 fixed thereon at an inclined angle of, for example, 45° with respect to the first axis A.

Further, a part of the second rotating bracket 3 is attached to the lower end portion of the second hollow shaft 13, and similarly to the first hollow shaft 4, the first rotating bracket 3 is connected to the first rotary bracket 3 by ball bearings 14 at both ends. It is rotatably supported by the bearing sleeve 2a of the rotating bracket 2 about a second shaft B, and is driven by a worm 15, a worm wheel 16, and a second servo motor 17. The second rotating bracket 3 connects the second condensing means 18 to the third condensing means 18 at its lower part.
It is supported on the same axis as axis C. This third axis C
is set toward the intersection P of the first axis A and the second axis B. The intersection angle α between this first axis A and second axis B
is set to 30° in this example, and the intersection angle β between the second axis B and the third axis C is the same as above.
It is formed at 30°. Therefore, the second axis B is a bisector of the angle that intersects the first axis A and the third axis C.

The laser beam 20 is incident along the first axis A from the upper part of the first hollow shaft 4, passes through the semi-transmissive reflecting mirror 12, and is guided to the first condensing means 11. , is divided by the reflecting mirror 12, and is moved along the second axis B by the reflecting mirror 19 attached to the first rotating bracket 2, and further on this second axis B, is divided by the reflecting mirror 12 and is attached to the second rotating bracket 3. The light is guided to the second focusing means 18 by a reflecting mirror 21 attached to the second rotating bracket 3 on the third axis C, and
The light is irradiated simultaneously from two directions toward the intersection P of the axis B and the third axis C. These reflectors 12,1
9, 21, and 22 constitute laser beam guiding means.

Next, FIG. 2 shows an example in which the multiple laser irradiation head 1 is incorporated into a planar rectangular coordinate processing apparatus 24.

The multiple laser irradiation head 1 of the present invention includes a support frame 6
It is attached to the vertical slide part 25 by. The vertical slide portion 25 is supported movably in the Z direction with respect to the saddle 26,
It is positioned in the height direction by a servo motor 27 and a feed screw unit (not shown). Note that the laser beam 20 from the laser oscillator 23
passes through the guide tube 28 and the beam bender 29
etc., and is guided onto the first axis A.

The saddle 26 is attached to the cross beam 30 so as to be movable in the Y direction, and is driven in the Y direction by a servo motor 31 and a feed screw unit (not shown). Note that the cross beam 30 is supported by left and right columns 34 on the machine stand 33 while straddling the table 32.

Further, the table 32 is placed on the bed 35 with
It is supported so as to be movable in the X direction, and is driven in the X direction by a servo motor 36 and a feed screw unit (not shown). The workpiece 37 is placed on the table 32 in a fixed state. Note that these servo motors 27, 31, and 36 are driven by a control device 38 to move the multiple laser irradiation head 1 in the Y direction and the Z direction.
direction, and the workpiece 37 is moved in the X direction.

Effects of the Embodiment After setting the multiple laser irradiation head 1 to a predetermined height based on a control program input in advance, the control device 38 continuously applies motion in the Y direction and at the same time moves the workpiece 37 to a predetermined height. also gives motion in the X direction. As a result, the multiple laser irradiation head 1 moves the intersection point (processing point) P along a processing trajectory as shown in FIG. 3, for example.

On the other hand, during such movement, the first servo motor 9 rotates the first hollow shaft 4 in a predetermined direction to constantly direct the laser beam 20 on the third axis C to each point on the trajectory. Set it in the normal direction. During this time, the first focusing means 11 and the second focusing means 18 irradiate the two laser beams 20 toward the intersection (processing point) P, and the workpiece 37 is
It is thermally fused along the letter-shaped cutting line. The cutting angle (α+β) at this time can be arbitrarily set within the range of the maximum intersection angle (60°) by rotating the second servo motor 17. That is, when the second condensing means 18 is set at an angle as shown in FIG. 1, the cutting angle is set to the maximum. However, this second condensing means 18
When rotated around , the fusing angle can be freely set in the range from 60° to the minimum angle in this embodiment. Here, the minimum angle is the relative angle of the optical axes of the first condensing means 11 and the second condensing means 18 when they are closest to each other without interfering with each other. This cutting angle is usually not changed during one continuous process, but it can also be changed.

Note that the first servo motor 9 and the second servo motor 17 are controlled by a dedicated control device, or are controlled by the control device 38 in the same way as the other servo motors 27, 31, and 36. It has come to be controlled by

Modifications of the Invention The above embodiments show an example in which the maximum intersection angle is set to 60°, but this maximum machining angle is appropriately set depending on the application. Further, the intersecting angles α and β may be set equal as in the embodiment, or may be set differently depending on the processing details.

Effect of the invention The present invention provides the following effects.

First, three-dimensional cut pieces can be efficiently removed from the workpiece in a single process. Also, the machining depth,
Since the intersection angle during machining can be arbitrarily set even during operation, it is possible to machine a V-shaped groove, a steep hole, and a groove at any angle on the workpiece. In addition, parts of a predetermined shape can be cut out from a single block of difficult-to-cut material by rough machining, and parts of complex shapes such as molds can be manufactured by rough machining with high efficiency.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view of the multiple laser irradiation head of the present invention, Fig. 2 is a perspective view of the processing apparatus having the multiple laser irradiation head of the present invention, Fig. 3 is a plan view of the processing trajectory, and Fig. 4 is the processing path. It is an enlarged sectional view of a part. 1... Multiple laser irradiation heads, 2... First rotating bracket, 3... Second rotating bracket, 4...
1st hollow shaft, 6... support frame, 9... first servo motor, 11... first condensing means, 12... semi-transmissive reflector, 13... second hollow shaft, 17... th... 2 servo motor, 18...second condensing means, 19...reflecting mirror, 20...laser beam, 21, 22...reflecting mirror, 23...laser oscillator, 24...processing device, 37...workpiece thing.

Claims (1)

[Claims] 1 A first rotating bracket rotatably supported on a first axis, a first condensing means attached to the first rotating bracket on the first axis, and a predetermined intersection angle with respect to the first axis. A second rotating bracket rotatably supported by the first rotating bracket on a second axis that intersects with the first rotating bracket.
a rotating bracket; a second focusing means mounted at a predetermined angle to the second axis of the second rotating bracket and toward the intersection of the first axis and the second axis; 1. A multi-laser irradiation head comprising a laser beam guiding means for guiding a laser beam to the first condensing means and the second condensing means.