JPS59127988A - Laser working machine - Google Patents

Abstract

PURPOSE:To eliminate deviation in a focal point and to prevent the damage on supporting posts in a working installation wherein a laser irradiating part and a supporting part for a working member make two-dimensional movement by sinking automatically the member supporting posts right under laser irradiation. CONSTITUTION:Supporting posts 18 for a member 20 are installed on supporting bars 17 in parallel with the scanning direction of an irradiating head 13. The bars 17 are supported by slide bars 23 having the oblong holes 16 and wedge plates 25 of guide plates 14. The bars 23 are moved by the cam grooves 26 of a base plate 10 and sink the posts 18 by wedging. The grooves 26 are provided under the scanning line of the head 13 and the posts 18 right under the irradiated part are always sunk. The adjacent front and rear posts 18 do not sink and therefore the focal point does not deviate. The damage at the top end of the posts 18 is obviated. It is also possible to make the posts 18 of flat plates.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a laser processing machine, and particularly to a workpiece support device thereof.

Laser processing machines generally perform processes such as cutting and drilling by irradiating the workpiece with laser light without applying relative two-dimensional movement between a support device on which the workpiece is placed and a laser irradiation unit. It is something. By the way, a conventional support device has a large number of conical support posts arranged in a plane, and the workpiece is simply placed on these support posts. The purpose of making the support post conical is to minimize the contact area with the workpiece, but if the tip of the support post is directly below the point where the laser beam is used to cut or drill holes, it may cause light condensation. The laser beam passes through the machined grooves and holes of the workpiece and attaches to the support post-h.
It is impossible to avoid being irradiated at the edges. As a result, part of the post may be damaged by the laser beam, or the laser beam reflected from the upper part of the support post may be irradiated onto the workpiece again, resulting in unnecessary machining, resulting in a decrease in machining accuracy and the machined surface. This caused machining defects such as irregularities in the process. During rough laser processing, assist gas is normally blown onto the processed area, but with conventional equipment, this gas flow may pass through the holes and grooves already machined in the workpiece and hit the top of the support post, causing disturbances. However, machining defects may occur due to the turbulence of this gas flow. Furthermore, when cutting a large number of the same pattern, it is necessary to avoid cutting directly above the support post to prevent machining defects, which may result in wasted material.

The present invention has been made in order to solve these problems, and the workpiece support device is divided into three or more support segments, each of which can be moved up and down independently, and By lowering the support segment in conjunction with the relative movement of the laser irradiation unit to the support segment, the support segment and the workpiece can be kept in a non-contact state when processing is performed on the support segment. This is characterized in that unnecessary and harmful processing due to damage to the support device caused by the laser beam or reflection of the laser beam by the support device does not occur.

The invention will now be described with reference to illustrated embodiments.

The laser processing machine processes the workpiece described above while giving a relative two-dimensional movement to the laser beam, but in the following embodiment, the workpiece is moved in the X direction by the laser beam. This is an example in which the image is moved in the Y direction. 1st
The figures to FIG. 4 show a first embodiment of the present invention,
A slide table 12 is supported on the base plate 10 via a linear roller guide 11 so as to be slidable in one direction, and a laser irradiation section 13 is located on one side of the base plate 10. Assuming that the sliding direction of the slide table 12 is the X direction, the laser irradiation unit 13 is configured to be able to move in the Y direction perpendicular to the X direction, regardless of the movement of the slide table 12 at a fixed position on the base plate 10. There is.

A workpiece support device, which is a feature of the present invention, is supported by the slide table 12. The slide table 12 has guide plates 14.14 oriented in the X direction integrally erected on both sides thereof, and between the guide plates 14.14 a plurality of (seven in this embodiment) support segments facing the Y direction are installed. 15”-
It is supported so that it can be moved downward. The support segment 15 includes a support bar 17 with a rectangular cross section whose both ends are vertically movably inserted into the longitudinal elongated hole 16 of the guide plate 14, and a plurality of conical support posts 18 erected on the support bar 17''. and a vertical guide 19 protruding downward from the support bar 17, and the workpiece 20 is supported between the dots at the upper ends of the support bosses 18. Reference numeral 21 denotes a retaining pin that is fitted into the protruding end of the support bar 17 from the guide plate 14 to prevent the support bar 17 from coming off and at the same time restrict its movement in the Y direction.

Slide pars 22 facing in the same direction as the support bars 17 are supported below the support bars 17, respectively. The slider 22 is slidably inserted into the guide hole 23 of the guide plate 14, and a pattern plate 25 is fixed to the upper surface of the slider 22, which corresponds to the inclined portion 24 on the lower surface of the upper and lower guides 19 of the support bar 17.

When the cutting plate 25 slides to the right in FIG. 3, it raises the support segment 15 to the upper workpiece holding position via the inclined portion 24, and when it slides to the left, it lowers the support segment 15.

However, the sliding position of the lever slider 22 is regulated by a cam groove 26 fixedly provided on the base plate 10. That is, a guide pin 27 facing downward is integrally provided at the protruding end of the slide par 22 from the guide plate 14, and on the other hand, a cam groove 26 is formed in the base plate 10 by two cam plates 28 and 29 fixed thereto. A guide pin 27 can be fitted into this cam groove 26.

As is clear from FIG. 1, this cam groove 26 has a trapezoidal shape, and the position of its center in the X direction coincides with the position directly below where the laser irradiation section 13 moves in the Y direction.

The wood laser processing machine configured as described above operates as follows. When the slide table 12 moves in the X direction, the guide pin 2 protruding from the slide par 22 of the support segment 15
7 moves within the cam groove 26 as shown in A, B, and C in FIG. When the slide par 22 moves from point A to point B, the guide pin 27 is pulled outward by the cam groove 26, and as a result, the slide par 22 and the plate 25 move to the left in FIG. The force that had raised the workpiece 20 to the holding position is no longer present, and the support segment 15 is lowered as shown in FIG.

In other words, when the slide par 22 moves from point A to point B, the support post 18 of its support segment 15 separates from the workpiece 20. And the supporting segment at this time)
Since the position 15 coincides with the Y direction in which the laser irradiation unit 13 moves or moves thereafter, the laser irradiation unit 13
There is a very small possibility that the support segment (15) directly below will receive laser light from the support segment (15). Note that at this time, the workpiece 2
0 is held by the other support segments 15, so there is no adverse effect on processing.

Next, when the slide par 22 moves from point B to point 0, the slide par 22 is pushed in by the action of the cam groove 26 and returns to the state shown in FIG. 3. Then, the servant board 25 passes through the inclined portion 24 and the upper and lower guides 19 to the support segment 1.
5, that is, since the support post 18 is pushed up, the support post 18 again brings its upper end dotted portion into contact with the workpiece 20 and supports the workpiece 20. This state is
By appropriately setting the wedge angle α of the plate 25, the slide table 12 is further moved in the X direction and the guide pin 2
7 can be maintained even after it comes out of the cam groove 26. Now, if the wedge angle of the pattern board 25 is α and the angle of static friction between the board 25 and the inclined part 24 is tan (tan = yi; 壓: static 11 - coefficient of friction), then the minimum force required to pull out the pattern board 25 is F is expressed as F=w[tan +tan (in - α) (the weight is the load that both sides of the fighting board 25 receive). Sword board 2
The condition when 5 comes out naturally is F=O, so α=2
Man.

That is, if α is 2λ, the punch board 25 will not come off naturally, and the relationship between the pattern board 25 and the inclined portion 24 will be a tightening mechanism that automatically tightens, and the pattern board 25, that is, the support par 17 will not come out naturally.

However, even if the wedge angle of the pattern board 25 is not set in this way,
For example, if the guide pin 27 is engaged with a positive cam to restrict the entire movement range of the slide table 12, or if a spring is used to urge the slide par 22 to slide to the right in FIG. A similar effect can be obtained. Further, the -L downward movement of the support segment 15 can obviously be achieved by a mechanism using hydraulic pneumatics or an electric mechanism, but according to the illustrated embodiment, no special power source is required.
It has the advantage of having a simple structure and reliable operation.

5 and 6 show another embodiment of the present invention. This embodiment differs from the first embodiment in the shape of the support segment 15, and all other parts are the same as in the first embodiment. The support segment 15 has a flat strip plate 30 at its upper end, and a fine V-groove 31 is continuously formed on the upper surface thereof. Using a flat plate such as a strip plate as a support device for the workpiece increases the risk of damage to the support device by the laser beam, and increases the possibility that the laser beam will be reflected by the support device. Although this could not be done with a laser processing machine, in the present invention, the support segment 15 descends in response to laser beam irradiation, making it possible to use such a strip plate. By constructing support segments from such flat plates, it is also possible to perform laser processing on flexible materials such as cloth and sheet materials, which could not be supported with conventional conical support posts due to their unevenness. can. Note that the V-groove 31 functions to prevent reflected light from returning to its original direction in the event that the strip plate 30 is irradiated with laser light.

Note that it is preferable that the support segment 15 is divided into a large number of parts in consideration of the stability of supporting the workpiece 20, but theoretically, the present invention can be realized if the support segment 15 is divided into five or more parts.

In summary, the present invention provides three or more parts that support the workpiece.
Since the supporting segment of the laser beam is lowered in conjunction with the relative movement toward the lower part of the laser irradiation unit, the possibility that the laser beam will hit the supporting device is reduced, and there is a risk of damage to the supporting device itself, as well as being reflected by the supporting device. It is also possible to prevent deterioration of processing accuracy due to laser light.

Furthermore, even if the laser beam were to hit the support segment, it would not be damaged by the laser beam because it is lowered and is not at the focal point where the energy density of the laser beam is at its maximum.
Increased safety for the surrounding area.

Furthermore, since the assist gas is no longer disturbed by the support device, it is possible to further improve machining accuracy, and since there are no restrictions on the T position, there is no waste in material removal, increasing economy. be able to.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of a laser processing machine according to the present invention, FIG. 2 is a front view of the same, and FIGS.
5 is a plan view showing another embodiment of the present invention, and FIG. 6 is a front view thereof. 10... Base plate, 12... Slide table, 13... Laser irradiation part, 14 River guide board, 15...
-Support segment, 17... Support bar, 18... Support post, 20... Workpiece, 22... Slide bar, 24... Inclined part, 25... Private board, 26... - Cam groove, 27...Guide bin 27.3o...Strip plate. Patent applicant: Asahi Optical Industry Co., Ltd. Agent: Kunio Miura 2 47

Claims (1)

[Scope of Claims] (1) Consisting of a support device on which a workpiece is placed and a laser irradiation section that irradiates the workpiece with laser light, the relative position between the support device and the laser irradiation section is In a laser processing machine that processes a workpiece by applying dimensional motion, the above-mentioned support device is divided into three or more support segments that can move downward independently, and these support segments are normally used to support the workpiece. 1. A laser processing machine, wherein the laser processing machine is held in position and lowered in conjunction with relative movement of the laser irradiation section onto the support segment. (2. Scope of Claims In claim 1, the support segment has a plurality of conical support posts, and the workpiece is supported at the dot-shaped upper end of the posts. (3) Scope of Claims In claim 1, the support segment is a laser processing machine having a strip plate that is parallel to and supports the workpiece. (4) Any one of claims 1 to 3.
, the support segment has a sloped portion on its lower surface;
This inclined portion engages with the wedge plate of the slide bar, and the slide bar has an integral guide pin, and the engagement between the guide pin and the cam groove responds to the relative movement of the support device and the laser irradiation unit. A laser processing machine in which the slide bar slides and the support segment moves downwards accordingly. (5) In claim 4, the free angle of the wedge plate is:
A laser processing machine that is set so that it does not move relative to the support segment unless an external force is applied.