JPS5924596A - Laser working device - Google Patents

Abstract

PURPOSE:To prevent the sticking of cooling water and molten metal on a lens, by providing assist gas guides in nozzles for ejecting an assist gas and irradiating a laser beam and providing a slight space parts between the guides and a nozzle. CONSTITUTION:A nozzle assembly 41 consists of an inside nozzle provided with an ejection port 43 for irradiating a laser beam LB together with an assist gas to the work W, and an outside nozzle provided with a passage 45 and an ejection port 47 for ejecting a coolant. The 1st assist guide part 97 of a funnel shape is internally mounted in the large diameter part in the bore of an inside nozzle body 49 and the 2nd assist guide member 99 of the same shape is internally mounted in the small diameter part in the lower part. Slight space parts 101, 102 are provided between these guide members 97, 99 and the inside nozzle body 49. Since the assist gas is ejected at the flow rate increased by the guides 97, 99, the sticking of the cooling water and molten metal from the cutting part on the lens is prevented and even if some infiltrates the same, the intruded cooling water and molten metal are entrained in the parts 101, 102 and are prevented from intruding upward.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a laser processing device that processes a workpiece such as a metal plate by various methods such as C cutting and hole drilling using a laser beam. It is something.

As is well known, laser beams are widely used in industry to process various materials, and in the field of metal processing, laser beams are used to process plate-shaped workpieces such as metal plates (A It is used for cutting and drilling holes.

In general, laser processing equipment that processes plate-shaped workpieces is equipped with a reflecting mirror to irradiate the workpiece with a laser beam from a laser oscillator and a condensing lens to focus the laser beam. It consists of a head section and a processing table section that horizontally supports and moves the workpiece.

The laser beam used in laser processing is generated by a laser oscillator and is irradiated with an assist gas (for example, oxygen gas) from the processing tool to the workpiece in order to melt the workpiece.

This assist gas reacts with the workpiece to help melt the -C workpiece and also removes molten metal and slag. It also protects the condenser lens from scattering molten metal. It also has the effect of

In laser cutting processing, the energy of the laser beam focused on the processing point of the workpiece is absorbed by the workpiece as thermal energy, and the workpiece is transferred to the assist gas (02 scraps). The oxidation reaction with the material
The reaction heat (= 1) is also added to this energy.The 1°C liquid machining system is melted and cut by this energy.In general, when cutting with a laser beam,
The effect of the heat generated in the processed area on the surrounding area is very small compared to plasma arc cutting, gas fusion cutting, etc. However, when the liquid I iJ is a thick plate or when the cut shape is fine and complicated, the range of the heat-affected portion described above becomes wider in order to slow down the machining speed. Therefore, when the shape to be cut is minute and complicated, the required fine shape is melted and completely removed. On the other hand, when using a thick plate, there was a problem in that the precision of the cut surface deteriorated.

To deal with this, the conventional method was to cut the workpiece while cooling it with water, but after the cutting process, the cooling water enters the pores at the tip of the nozzle due to capillarity, resulting in "C" residue. death,
There was also a problem that when cutting was restarted, the assist gas was scattered by the jet and landed on the lens.

The first object of the present invention is to provide a new laser processing apparatus that can process a C1 fine shape while preventing the influence of heat generated in the processing area on the surrounding area.

A second object of the present invention is to provide a laser processing apparatus that can prevent the influence of heat on the processing peripheral area even at slow processing speeds and perform processing with good precision on the cut surface.

A further object of the present invention is to provide a laser processing apparatus in which the processing head is equipped with a cooling device that efficiently prevents the thermal energy of the laser processing portion from diffusing to the surrounding area.

Furthermore, it is an object of the present invention to provide a laser processing device having a processing head that prevents the cold 711 water of the cooling device from flowing back into the nozzle.

Other objects and advantages of the invention will become apparent from the description of the accompanying drawings, which illustrate preferred embodiments of the invention and its principles.

As shown in Figures 1 and 2, the laser indicated by number 1 -
The processing device is connected to a laser oscillator 3, such as a CO2 (carbon dioxide) laser oscillator. The laser oscillation device 3 is currently available, and the laser oscillation device 3 is one that is currently available.
- arranged to produce a beam LB and deliver it to the laser processing device as indicated by the arrow in FIG.

The laser processing device 1 includes a base 5, a post 7 fixed to one end of the base 5 and formed vertically, and supported above the base 5 by the post 7 in a horizontal cantilever shape. A--A bar consists of a Radbeam 9 (at the upper end of the base 5, a liquid such as a sheet metal to be processed is placed) - a fixed table having a plurality of slide balls 13 on which the material W is placed horizontally; 11 has been set up.

A processing head assembly 15 having a mirror assembly 17 and a condensing lens 19 is provided at the front end of the overlapping Radbeam 9 . Soshi-C
1 The mirror assembly 17 is provided to refract the laser beam LB from the laser processing device 3 in the direction of the condenser lens 19 and the workpiece W. 17, in this embodiment roughly two mirror assemblies 21, 23 are provided.
There is C. Accordingly, -C1 The laser processing apparatus 1 as described above is
The laser beam LB is received from the laser processing device 3 and is supplied to the processing unit for processing the workpiece W through the rad assembly 15 as shown by an arrow r.

In order to supply and position the workpiece W, the laser processing apparatus includes a horizontally movable first key (an I ridge 25, and an eye movably mounted on the first carriage 25). A second carriage 27 that holds a plurality of gripping means 29 for gripping the workpiece W is provided.
A pair of lasers 3 fixed parallel to the upper ☆M;
It is slidably placed on the soil 1 and 15, and when driven, it can move toward and away from the processing zone located directly below the processing head 15. The second carriage 27 holding the gripping means 29 is placed on the first carriage 25 and is driven so that it can move horizontally in a direction perpendicular to the rail 31. The gripping means 29 is removably attached to the second grip 27 and can be adjusted depending on the width of the workpiece W to be processed. Also, a pair of movable daples 33.3 having a plurality of slide balls 13 to support both ends of the workpiece UW! ：+ can be attached to the first carriage 25 and move them to the moving table 3.
3.35 is adapted to be moved with respect to the workpiece W by the first carriage 25. Further, in order to initially position the workpiece W- on the fixed cheese 110, a retracting C cut 1 to a collar means 37 is applied to a part of the rape processing equipment M1 with water percentage. C is provided on the arm member 39 fixed to LL. Therefore, when the workpiece W is first gripped by the gripping means 29 so that its end portion comes into contact with the stopper means 37, the workpiece W is positioned on the fixed daple 11. . In the above-mentioned positioning, the C1 front holding means 29 is placed in the first carriage 25 (i'7.@L/C in the first position near the boss 1-7).
Ru.

With the above-described configuration, the workpiece W is
5 and 2nd Kittredge 25, 27': C: Directly below the said brushing head assembly '15 on the said fixed diesel 11 soil. The laser beam 1-13 is used to cut or punch holes.

Of course, the laser beam LB produced by the rake oscillator 3 is sent to the processing head array 115, and as indicated by the arrow J, the laser beam LB is sent to the processing head array 115, and is reflected by the mirror assembly 17 as indicated by the arrow J. The rake beam iB is then supplied to the workpiece W together with an assist gas such as oxygen gas through a condenser lens 19.

Also, it will be readily understood by those skilled in the art that the first and second blades 25, 27 can be moved automatically and continuously under programmed numerical control.

Next, the block [11,? Shining Rad Assembly 15
Regarding the configuration of the nozzle assembly provided in
°Explain. Referring to FIG. 3, nozzle assembly 4
1 is an inner nozzle equipped with a spout 433 that irradiates the workpiece W with the laser beams L and B together with the gas; It is a double nozzle that is integrally configured with an outer nozzle and an outer nozzle. This inner nozzle consists of an inner nozzle body/19 and an inner nozzle tip 51 on the right and left sides. The outer nozzle similarly consists of an outer nozzle body and a removable outer nozzle dip 53. The coolant passage communicates with the coolant inlet 55 -C. Further, a screw 57 is formed on the outer diameter portion of this inner nozzle body. The inner nozzle main body 49 is held by a sleeve-shaped holding member 59 so as to be vertically slidable. In addition, a sleeve-shaped gauging 61 is integrally fixed to an annular member 63. It is equipped with a pressure 5165 for measuring the pressure) j. A ring-shaped collar member 67 is inserted into the substantially central portion of the double nozzle so as to be slidable downward.

This double nozzle is adjusted by a plurality of adjustment screws 69.
This is held in the casing 61 by a spring 73 via a washer 71 so that its horizontal position can be adjusted. The double nozzle is provided so that its vertical position can be adjusted by an annular J!1 joint nut 75 that engages with the screw 57.
It is supported by an annular portion 79 that is irritating. Also,
This double nozzle sleeve-shaped holding member 59 is attached to the pin 8.
1 and the bottle 83 (it is held so as not to rotate, but can be moved in the vertical direction). j
, or a suppression mechanism 8; 5 for counteracting and overcoming distortion.

This suppression mechanism 85
It consists of an annular caster roller holding member 87 that securely covers the first star roller, and is fixed to the lower surface of the annular portion 179 by bolts.

An annular discharge nozzle 91 for sucking and discharging the coolant is provided inside the annular caster roller holding member.
The coolant accumulated on the upper surface of the tube is suctioned and discharged from an annular suction tube (193) surrounding the outer nozzle by a vacuum pump (not shown). In addition, a seal ring 95 is attached to the kill star roller holding portion H to prevent the coolant from spreading to the surrounding area. -C.In the large diameter part of the interior of the inner nozzle body, a funnel-shaped first assist 1 to gas guide part 97 are installed, and a second assist 1 of the same shape is installed in the lower small diameter part. ~A gas guide member 99 is installed inside.This first assist-gas guide member and the second
Some spaces 101 and 103 are provided between the assist gas guide portions A and the inner nozzle body, respectively.

As can be understood from the above description of the configuration, by supplying a cold IJ agent to the coolant passage from a cold IJ agent supply source (not shown), the coolant is ejected from the laser beam. This means that the vicinity of the machined part is cooled. Therefore, the above-mentioned finely shaped portions can be machined without melting and disappearing, and a good cutting surface accuracy can be obtained on the original plate. On the other hand, the cold Ml agent that has flowed out onto the surface of the workpiece is prevented from widely spreading around the surface of the liquid I+A by the seal ring, and is discharged from the annular suction port 93 by a pump (not shown) Add C liquid to the outside by suctioning the surface of the second layer)
jCq never. In addition, the coolant constantly circulates and the power of C keeps it cool! + Great effect.

Furthermore, according to the present invention, Assis 1 to Kas are the first and second
assisted by the gas guide, the flow rate is increased and C
This prevents splashes from the cut portion of C1, such as cooling water and molten metal, from adhering to the lens. Further, even if some of the flying objects enter the nozzle, they are caught in the space provided in two stages and are prevented from entering upward.

It should be noted that the present invention is not limited to the above-described embodiments, but can be implemented in other embodiments by making appropriate design changes.

[Brief explanation of the drawing]

FIG. 1 is a side view of a Rayleigh processing apparatus according to the present invention. FIG. 2 is a plan view of the second system of FIG. 1; FIG. Figure 3 is an enlarged sectional view of the laser processing nozzle assembly shown in Figures 1 and 2. (Explanation of symbols representing main parts of the drawings) 97.99.
・・Assis】~Gaskai 1~101.103...Space part

Claims (1)

[Claims] (Cold N) that spouts a cooling medium around the nozzle that spouts assist gas and irradiates the workpiece with a laser beam.
In a laser processing device equipped with a medium jet port and an inlet port for the cold FiO medium around the jet port, an anth 1-gas kite is provided in the nozzle, and an anth-gas kite is provided between the assist gas guide and the nozzle. A laser processing device characterized by having a slight space.