KR20100007741U - / laser processing machine having means for sprinkling and/or for cooling the inside wall of a pipe and method for processing a pipe by means of such a machine - Google Patents

Abstract

The present invention relates to a laser processing machine having means for cooling and / or watering the inner wall of the pipe and a method for processing the pipe by such a laser processing machine.
The laser processing machine for processing the pipe 4 by means of a laser beam is provided with means for cooling and / or cooling the inner wall of the pipe before or during the laser processing operation. The means comprises a nozzle 9 for the fluid. The nozzle 9 is arranged in front of the machining position of the laser beam in the longitudinal direction of the pipe 4, and the fluid cone impinges on the inner wall of the pipe at both the level of the machining position of the laser beam and the opposite of the machining position of the laser beam. Create a fluid cone.
In the method for machining the pipe 4 by means of a laser beam, the nozzle 9 is introduced into the pipe 4 in the longitudinal direction of the pipe until it is placed in front of the machining position of the laser beam. Next, the nozzle 9 creates the fluid cone described above.

Description

LASER PROCESSING MACHINE HAVING MEANS FOR SPRINKLING AND / OR FOR COOLING THE INSIDE WALL OF A PIPE AND METHOD FOR PROCESSING A PIPE BY MEANS OF SUCH A MACHINE}

The present invention is a laser processing machine for processing pipes by means of a laser beam, comprising means for cooling and / or watering the inner wall of the pipe by fluid before or during the laser processing operation, the inner wall of the pipe Means for cooling and / or cooling water are directed to a laser processing machine having a nozzle for fluid introduced into the pipe in the longitudinal direction of the pipe. The invention is also a method for machining a pipe by means of a laser beam, wherein the inner wall of the pipe is cooled using a fluid by a nozzle introduced into the pipe in the longitudinal direction of the pipe before or during the laser machining operation. It relates to a method for machining pipes that is to be cooled or watered.

During laser cutting, a spatter or dross clings to the workpiece inside the workpiece opposite the cutting edge. This requires a high cost post-processing of the workpiece, for example by sand blasting. This problem occurs especially in workpieces made of special steels.

Likewise, discoloration at the workpiece side opposite to the cutting edge caused by excess of laser energy at the time of piercing or cutting can result in expensive post-processing, for example by grinding or polishing. In pipes with thick wall thicknesses and complex shapes, heat erosion may occur due to strong heating in the material. This problem arises especially for workpieces made of structural steel.

EP 1 454 700 A1 proposes a rigid cooling and / or rinsing lance. This lance is introduced inside the workpiece to be machined and makes it possible to carry out suction-picking and cooling. A gas / air mixture is used to capture the residue in the lance.

The prior art on which the preamble of the independent claims is based is known from JP 62-183985 A and JP 11-090661 A1.

JP 62-183985 A describes an apparatus and method for cladding steel pipes. Powder for cladding is applied to the outer wall of the pipe and melted by means of a laser beam. Inside the pipe, coolant is sprayed on the inner wall of the pipe in the direction toward the machining position of the laser beam by a nozzle assembled at the end of the conduit.

JP 11-090661 A discloses an apparatus and method for laser cutting of tubes. For the processing of the tube, the laser beam is guided from the outside to the wall of the tube. During the cutting process, the conduit for cooling air is inserted inside the tube to such an extent that a nozzle disposed at the end of the conduit in the insertion direction is positioned beyond the processing position of the laser beam. The cooling air coming out of the nozzle is guided in the opposite direction to the insertion direction of the conduit and consequently passes the machining position of the laser beam.

The object of the present invention is to more effectively prevent deposits sticking inside the pipe as a result of processing.

This object is achieved by a laser processing machine according to claim 1 and by a method according to claim 9. In the case of the present invention, a nozzle for the fluid for cooling and / or watering the inner wall of the pipe is arranged in front of the processing position of the laser beam in the longitudinal direction of the pipe. From this, the nozzle directs the fluid cone to the inner wall of the pipe at both the machining position level of the laser beam and the opposite of the machining position of the laser beam. Spraying water and / or cooling medium may be injected in an optimally metered amount. Cooling and / or watering of the pipes is possible at various times. In the case of cooling and / or watering during the laser machining operation, direct cooling of the cutting edge can be performed. The fluid may also be directed to the opposite side with respect to the processing position of the laser beam. Especially in the case of workpieces made of special steel VA, the attachment of the sputtered material is prevented. In the case of processing structural steel, less thermal distortion occurs and / or improved cutting quality. If watering and / or cooling is performed simultaneously with the laser processing operation, the processing fumes are captured. As a result, it can be envisioned not to use the unit for extracting the processing mist.

In the case of a preferred form of the present invention, a hose system is provided for cooling and / or watering of the inner wall of the pipe, the flexible hose of the hose system can be introduced and placed into the workpiece to be processed by compressed air (claims) 2). The hose system allows watering and / or cooling to be done during laser machining operations or during unproductive machining times.

In a further preferred embodiment of the present invention, a nozzle provided at one end of the hose and having means for forming back pressure of compressed air serves to insert and place the hose (claim 3).

The double wall hose (claim 5) allows both compressed air and fluid for cooling and / or watering the inner wall of the pipe to flow from the end of the hose to the nozzle. The fluid does not necessarily need to be water. Also contemplated are water, including water / oil mixtures, rinsing agents and the like.

In the case of a further preferred embodiment of the present invention, the hose system comprises a reeling unit for the hose (claim 6). The reel unit allows the hose to be held taut and stored.

Means for cooling and / or watering of the inner wall of the pipe may be arranged at any desired location on the laser processing machine. Contemplated devices include devices on a supply station for a workpiece or a loading device for a workpiece (claims 7 and 8).

Preferred exemplary embodiments of the present invention are shown in the drawings and will be described below with reference to the drawings.

According to the present invention, deposits sticking inside the pipe as a result of processing can be even more effectively prevented.

1 is a side view of an apparatus for cooling and / or cooling an inner wall of a pipe with a fluid.
FIG. 2 shows a longitudinal cross section through the pipe shown in FIG. 1.
FIG. 3 shows a longitudinal cross section through the nozzle of the apparatus shown in FIG. 1. FIG.

As shown in FIG. 1, means in the form of a device 1 for cooling and / or watering the inner wall 2 of the pipe 4 is provided for the pipe 4 with a supply station of the laser processing machine. (3) is disposed on. The pipe 4 is held by a chucking device 5. Rather than the dimensions or dimensions of the device 1, in particular the maximum outer diameter of the hose system is selected to allow the processing of small profile diameters (minimum inner diameter of 10 to 12 mm).

The apparatus 1 comprises a reel unit 6 with a drum for a hose 7 which is introduced into a pipe 4. The reel unit 6 ensures that the hose 7 does not come in direct contact with the laser beam coming from the laser processing head. The motor drive 10 is used to wind or pull the hose 7 from the pipe 4.

As shown in FIG. 2, a fine water jet 11 also cools the debris resulting from the pipe 4 and processing. The back pressure generated by the nozzle 9 keeps the nozzle 9 in place. The nozzle 9 remains fixed immediately in front of the machining position of the laser beam, from which the nozzle cools and / or cools the inner wall 2 region and the cutting front of the pipe located opposite to the machining position of the laser beam. To live.

As shown in FIG. 3, the hose 7 is double walled and flexible. Fluid for cooling and / or cooling the inner wall 2 of the pipe is supplied to the nozzle 9 at the end of the hose lying inside the pipe 4 via the first channel 15 of the hose 7. . Compressed air, such as compressed air available in any case in a laser processing machine, flows through the second channel 14 of the hose 7. The hose 7 can be pushed into the pipe 4 by compressed air.

3 shows a nozzle 9 forming the central unit of the apparatus 1. The nozzle 9 has an annular opening 12 for compressed air and a nozzle orifice 13 for water. The environmental opening 12 and the nozzle orifice 13 adjoin the channel 14 for compressed air and the channel 15 for water, which extend inside the hose 7. The water supplied serves to cool and / or to cool the inner wall 2 of the pipe. Compressed air moves the nozzle 9 into the pipe 4 by recoil and emerges opposite to the insertion direction of the nozzle 9. The nozzle 9 can be changed if necessary. The nozzle orifice 13 generates concentric and conical water jets as cooling and / or watering both opposite sides of the inner wall 2 of the pipe and the cutting front. The nozzle 9 located at the end of the hose holds the hose 7 under tension by back pressure, regulates the fluid flow, and supplies the fluid to the inner wall 2 of the pipe.

1: device
2: inner wall
3: feeding station
4: pipe
5: fixed device
6: reel unit
7: hose
9: nozzle
10: motor driving part
11: water jet
12: annular opening
13: nozzle orifice
14: Channel
15: Channel

Claims (9)

A laser processing machine for processing a pipe 4 by means of a laser beam, comprising: means for cooling and / or watering the inner wall 2 of the pipe by a fluid before or during the laser processing operation, In a laser processing machine wherein the means for cooling and / or watering the inner wall 2 of the pipe comprises a nozzle 9 for fluid introduced into the pipe 4 in the longitudinal direction of the pipe,
The nozzle 9 is arranged in front of the machining position of the laser beam in the longitudinal direction of the pipe 4 and on the inner wall 2 of the pipe at both the level of the machining position of the laser beam and the opposite of the machining position of the laser beam. A laser processing machine, which generates a colliding fluid cone. The device according to claim 1, wherein the means for cooling / cooling or watering the inner wall 2 of the pipe is formed by a hose system for cooling / cooling or watering the inner wall 2 of the pipe, the hose system comprising: A laser machining machine comprising a flexible hose (7) arranged and introduced a part of the pipe (4) to be processed by compressed air. 3. Laser processing machine according to claim 2, characterized in that the nozzle (9) is provided at one end of the hose (7) and has means for generating back pressure of compressed air. 4. Laser processing machine according to claim 3, characterized in that the nozzle (9) has an annular opening (12) for compressed air. 5. The hose (7) according to claim 1, wherein the hose (7) is of double wall and the first channel (14) for compressed air to cool and / or cool the inner wall (2) of the pipe. And a second channel (15) for the fluid. 6. The laser processing machine according to claim 1, wherein the hose system comprises a reeling unit for the hose. 7. The laser processing machine according to any of the preceding claims, wherein the laser processing machine has a supply station (3) for the pipe (4), for cooling and / or watering the inner wall (2) of the pipe. Means are arranged in the region of the feed station (3). 8. The laser processing machine according to claim 1, wherein the laser processing machine comprises a loading station for the pipe 4, the means for cooling and / or watering the inner wall 2 of the pipe. Laser processing machine, characterized in that arranged in the region of the loading station. A method of machining the pipe 4 by means of a laser beam, the inner wall of the pipe being fluidized by a nozzle 9 introduced into the pipe 4 in the longitudinal direction of the pipe before or during the laser machining operation. A laser machining method for cooling and / or sprinkling 2),
The nozzle 9 is introduced into the pipe 4 in the longitudinal direction of the pipe 4 until it is disposed in front of the machining position of the laser beam, both the level of the machining position of the laser beam and the opposite of the machining position of the laser beam. A machining method, characterized in that by means of a nozzle (9) a fluid cone that impinges on the inner wall (2) of the pipe at all.

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