JP2016074001A - Laser cutting method of pipe material and sputter adhesion prevention fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laser cutting method of a pipe material and a sputter adhesion prevention fixture which prevents sputter or the like from being adhered onto an inner surface.SOLUTION: In a laser cutting method of a pipe material, a sputter adhesion prevention fixture 1 which, in order to prevent irradiation of a laser beam LB to inner surfaces F2 opposite to each other on the pipe material P1 or suppress adhesion of sputter onto the inner surface F2, is located between the inner surfaces F2 opposite to each other on the pipe material P1, divides an inner space of the pipe material P1 into a plurality of spaces 11A to 11D and has an acutely formed contacting part with the inner part of the pipe material P1 is arranged in the pipe material over the whole length of such a range as to perform laser processing on the pipe material P1 and the pipe material P1 is relatively rotated for a laser processing head 9 without moving the sputter adhesion prevention fixture 1 in the longitudinal direction.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a laser cutting method for a pipe material such as a round pipe and a square pipe, and a spatter adhesion preventing jig used in the laser cutting processing method, and more specifically, laser light to inner surfaces facing each other in the pipe material. The present invention relates to a laser cutting method of a pipe material and a spatter adhesion preventing jig that can prevent the irradiation of spatter and can suppress the adhesion of spatter to the inner surfaces facing each other.

  When laser cutting processing of pipe materials such as round pipes and square pipes, a laser beam penetrating from the outer surface of the pipe material to the inside may be irradiated to the inner surface facing the laser processing position, and occurs during laser processing. Sputtering may adhere to the opposed inner surface. Therefore, when the pipe material is a round pipe, a pipe material having a small diameter is arranged in the pipe material to be laser-cut (for example, see Patent Documents 1 and 2).

  It has also been proposed to insert a cooling medium supply head for ejecting a cooling medium into the corner of the square pipe so as to be movable in the longitudinal direction of the square pipe (for example, see Patent Document 3). .

JP-A-5-237679 Japanese Patent Application Laid-Open No. 9-155584 JP 2010-75959 A

  As shown in FIG. 1 of Patent Document 1, in a configuration in which a small-diameter pipe is simply disposed in a round pipe that performs laser cutting processing, spatter adheres to the outer peripheral surface of the small-diameter pipe, and laser cutting processing target. Therefore, there is a problem that vibration is likely to occur during rotation of the round pipe due to spatter that is unevenly adhered to the outer periphery of the small-diameter pipe. Further, for example, it is difficult to cope with a rectangular square pipe.

  Further, as described in Patent Document 2, in a configuration in which a spatter adhesion preventing member is inserted into a round pipe to be laser cut, and both ends of the spatter adhesion preventing member are supported by support members, Even when the pipe material is short, a long spatter adhesion preventing member is required and a supporting member is necessary, and it is difficult to simplify the configuration. Further, for example, it is difficult to cope with a rectangular square pipe.

  In the configuration described in Patent Document 3, in order to eject the cooling medium, it is necessary to connect the cooling medium supply head inserted into the square pipe so as to be movable in the longitudinal direction and the hose with a rotary joint. There is a problem in the simplification.

  The present invention has been made in view of the above-described problems, and is a laser cutting method for a pipe material, which prevents irradiation of a laser beam to the inner surface facing the pipe material, or adhesion of spatter to the inner surface. In order to suppress this, the pipe material is located between the opposing inner surfaces, the internal space of the pipe material is partitioned into a plurality of spaces, and the contact portion with the inside of the pipe material is formed sharply. A spatter adhesion preventing jig is arranged in the pipe material over the entire length of the range where laser processing is performed on the pipe material, and the pipe material is used as a laser processing head without moving the spatter adhesion preventing jig in the longitudinal direction. In contrast, the laser cutting process is performed by relatively rotating.

  Further, a spatter adhesion preventing jig disposed in a pipe material for performing laser cutting processing, and disposed between the opposed inner surfaces of the pipe material, and divides the internal space of the pipe material into a plurality of spaces. The contact part with the inside in the said pipe material is formed sharply, It is characterized by the above-mentioned.

  Further, in the spatter adhesion preventing jig, the spatter adhesion preventing jig includes a plurality of protrusions having a plurality of projecting portions formed with sharpened tip portions at appropriate intervals on both side edges that contact the inside of the pipe material. It is the structure which combined the board | plate material of the said appropriate shape.

  According to the present invention, there is provided the spatter adhesion preventing device in which the internal space in the pipe material is divided into a plurality of spaces and located between the opposed inner surfaces of the pipe material, and the contact portion that contacts the inside of the pipe material is sharply formed. The laser cutting process is performed by placing the pipe material. Therefore, the laser beam penetrating from the outer surface of the pipe material to the inside is prevented from being irradiated to the inner surface facing the laser processing position, and spatter scattered into the pipe material is applied to the inner surface facing the laser processing position. It can be prevented from adhering.

  Further, since the portion where the spatter adhesion preventing tool comes into contact with the inside of the pipe material is formed sharply, the spatter adhesion preventing tool is not welded into the pipe material during laser processing.

It is an isometric view explanatory drawing which shows the structure of the spatter adhesion prevention jig | tool which concerns on embodiment of this invention. It is explanatory drawing of the board | plate material which comprises a sputter adhesion prevention jig | tool. It is explanatory drawing at the time of arrange | positioning the spatter adhesion prevention jig | tool in a pipe material. It is explanatory drawing at the time of arrange | positioning the spatter adhesion prevention jig | tool of another structure in a pipe material.

  Hereinafter, the spatter adhesion preventing jig according to the embodiment of the present invention will be described with reference to the drawings. The spatter adhesion preventing jig 1 includes a plurality of plate members 3A and 3B combined in an X shape as shown in FIG. Configured. More specifically, the plate members 3A and 3B have the same shape, and as shown in FIG. 2, a slit 5 extending from one end side to the center portion in the longitudinal direction is formed in the center portion in the width direction of the plate members 3A and 3B. It is formed. And as shown in FIG. 1, it is combining in X shape by engaging so that the slit 5 of mutual board | plate material 3A, 3B may mesh | engage. When the spatter adhesion preventing jig 1 is arranged in a pipe material (not shown in FIGS. 1 and 2), the contact portions 7 on both side portions (both side portions in the longitudinal direction) that come into contact with the inside of the pipe material are shown in FIG. , 2, it is formed in a triangular shape, and its top is formed in a sharp shape.

  Therefore, as shown in FIG. 3A, when the spatter adhesion preventing tool 1 is disposed over the entire length in the square pipe P1, both sides in the longitudinal direction of the plate members 3A and 3B in the spatter adhesion prevention jig 1 are It will contact the inside of each corner of the pipe material P1. At this time, the portions of the plate members 3A and 3B that are in contact with the inside of the pipe member P1 are triangular top portions that are sharply formed. Therefore, the portion of each plate 3A, 3B that contacts the inside of the corner of the square pipe P1 is the top of the triangle, and is the both sides in the plate thickness direction of each plate 3A, 3B, that is, the corner. It is. Therefore, the spatter adhesion preventing jig 1 is in point contact with the inside of the pipe material P1. As shown in FIG. 3B, when the spatter adhesion preventing jig 1 is disposed over the entire length in the round pipe P2, the spatter adhesion preventing jig 1 is made of the pipe material P2 as described above. It will be in point contact with the inside.

  Therefore, for example, the pipe material P1 is sandwiched by a work clamp (not shown) rotatably provided in a laser processing machine (not shown), is rotated with respect to the laser processing head 9, and is laser-processed with respect to the pipe material P1. By irradiating the outer peripheral surface of the pipe material P1 with the laser beam LB while moving the head 9 relatively in the longitudinal direction, laser cutting of the pipe material P1 is performed. As described above, when laser cutting of the pipe material P1 is performed, spatter is scattered in the pipe material P1, and the laser beam LB is irradiated inside.

  Here, when the spatter adhesion preventing tool 1 is not disposed in the pipe material P1, the spatter scattered inside during the laser cutting processing of the surface F1 of the pipe material P1 is applied to the inner surface F2 facing the laser processing position. It tends to adhere. Further, the laser beam LB penetrating the surface F1 tends to irradiate the inner surface F2. Therefore, when the pipe material P1 is rotated to perform laser cutting on the inner surface F2 side, the laser cutting accuracy tends to be lowered.

  However, in this embodiment, as described above, the spatter adhesion preventing jig 1 in which the plate materials 3A and 3B are combined in an X shape is disposed in the pipe material P1. As is clear from FIGS. 3A and 3B, the spatter adhesion preventing jig 1 is disposed between the inner surfaces facing each other in the pipe material P1. The spatter adhesion preventing jig 1 is arranged inside the pipe material P1 to function to partition the internal space of the pipe material P1 into a plurality of spaces.

  Therefore, when the spatter adhesion preventing jig 1 is disposed in the pipe material P1, the internal space of the pipe material P1 is partitioned into a plurality of spaces 11A, 11B, 11C, and 11D. Therefore, since the spatter scattered inside during the laser cutting process of the surface F1 and the laser beam LB penetrating the surface F1 are received in the partitioned space 11A, the spatter adheres to the opposed inner surface F2. The penetrating laser beam LB is not irradiated.

  As described above, when the pipe material P1 is rotated relative to the laser processing head 9 to perform laser cutting of the pipe material P1, the contact position between the spatter adhesion preventing jig 1 and the inside of the pipe material P1 is determined. Laser cutting may be performed. At this time, since the spatter adhesion preventing jig 1 is in point contact with the inside of the pipe material P1, the portion where the sharp contact portion is in contact with the inside of the pipe material P1 is the laser cutting processing of the pipe material P1. At the same time, it is melted and removed, and the contact is released. Accordingly, spatter and molten metal generated during laser cutting of the contact portion are likely to move to the periphery. In other words, the spatter adhesion preventing jig 1 is not welded inside the pipe material 1. In the case of the round pipe P2, the same effect can be obtained.

  The spatter adhesion preventing jig 1 is located between opposing inner surfaces in the pipe material and has a function of partitioning the internal space of the pipe material P into a plurality of spaces, and further, the inner surface of the pipe material. It is sufficient that the contact portion 7 in contact with is formed in a sharp shape. Therefore, as shown in FIG. 4A, it is also possible to arrange one plate member 3A along the diagonal line of the square pipe P1. In the case of the round pipe P2, it is also possible to arrange only one plate material 3A.

  Furthermore, as a combination of a plurality of plate members, as shown in FIG. 4C, it is possible to adopt a configuration in which two plate members 3C formed in a substantially C shape are combined in opposite directions. .

DESCRIPTION OF SYMBOLS 1 Spatter adhesion prevention jig 3A, 3B Plate material 5 Slit 7 Contact part 9 Laser processing head 11A, 11B, 11C, 11D Space

Claims (3)

  A laser cutting method for a pipe material, in which a laser beam is prevented from irradiating an inner surface facing the pipe material or between the inner surfaces facing each other in the pipe material in order to suppress spatter adhesion to the inner surface. A range in which the pipe material is subjected to laser processing with a spatter adhesion preventing jig positioned and having an internal space of the pipe material divided into a plurality of spaces and a sharp contact portion with the inside of the pipe material. Is disposed in the pipe material over the entire length thereof, and laser cutting is performed by rotating the pipe material relative to the laser processing head without moving the spatter adhesion preventing jig in the longitudinal direction. A laser cutting method for a pipe material characterized.   A spatter adhesion preventing jig disposed in a pipe material that performs laser cutting, and is disposed between opposed inner surfaces of the pipe material to divide an internal space of the pipe material into a plurality of spaces and A spatter adhesion preventing jig having a sharp contact portion with the inside of the material.   The spatter adhesion preventing jig according to claim 2, wherein the spatter adhesion preventing jig includes a plurality of protrusions with sharpened tip portions at appropriate intervals at both side edges that contact the inside of the pipe material. A spatter adhesion preventing jig characterized by combining a plurality of appropriately shaped plate materials.

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