JPS6397391A - Fusion cutting method for concrete by laser beam - Google Patents

Abstract

PURPOSE:To assure depth of fusion cutting by projecting a laser beam curved by a mirror onto the fusion cutting line of concrete, angularly moving the mirror back and forth and removing the molten concrete from the fusion cut groove. CONSTITUTION:A condenser lens 16 and a mirror 18 are disposed above the fusion cutting line 14 of the concrete 12. The laser beam 22 from a laser beam oscillator 20 is curved by the mirror 18 and the projected through the lens 16 onto the line 14. The mirror 18 is angularly moved back and forth by the prescribed angle with respect to the set angle 45 deg., by which the projection point of the beam 22 is oscillated to both sides of the line 14. The molten concrete is expelled laterally or downward by the effect of gravity from the fusion groove. The clogging of the molten concrete into fusion-cut groove or the like is, therefore, obviated, and the depth of the fusion cutting corresponding to the energy of the beam is assured.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for fusing concrete using a laser beam.

(Prior art) Laser beams have coherence in that the polarization plane, frequency, phase, etc. are constant, so they are used for communications with sharp directivity and when utilizing the strong energy concentration of the beam. .

In particular, laser beams can melt concrete when irradiated with it due to their strong energy concentration, so they have traditionally been used as one of the concrete melting methods.

However, conventionally, the concrete 4 has been cut by moving a single laser beam 2 in a straight line along a fusing line 6 of the concrete 4, as shown in FIG.

(Problem to be Solved by the Invention) However, if one laser beam is simply moved in a straight line along the fusing line of the concrete, the fusing groove 8 in the concrete by the laser beam will be narrow and the molten dross (laser beam Concrete melted by the irradiation heat may get caught or clog in the fusing groove 8 and cannot be removed to the sides or below the fusing groove 8. Therefore, the laser beam is irradiated onto the remaining molten dross, and the energy of the laser beam is used to heat the molten dross and is not used to melt the unmelted concrete below the molten dross. First, there was a problem in that a fusing depth corresponding to the energy of the laser beam could not be obtained.

This invention was made in view of the above problems, and
The purpose is to remove molten dross from the sides of the cutting groove.

The molten dross is removed one after another downwardly, and as a result, the laser beam is irradiated onto the unmolten concrete that has newly appeared on the surface because the molten dross has been removed, and the energy of the laser beam is used to melt the unmolten concrete. The object of the present invention is to provide a method for fusing concrete using a laser beam.

(Means for Solving the Problems) In order to achieve the above object, the concrete fusing method using a laser beam according to the present invention bends a laser beam oscillated from a laser beam oscillator with a mirror. The laser beam is irradiated onto the concrete fusing line, and the mirror is reciprocated by a predetermined angle to vibrate the irradiation point where the bent laser beam falls on the concrete within a certain width across the fusing line. It consists of expanding the width of the fusing groove formed by melting the concrete by melting concrete within a certain width, and expelling the molten concrete to the sides and below of the fusing groove. be.

(Function) The laser beam is vibrated within a certain width across the fusing line to widen the width of the fusing groove formed by melting the concrete, making it easier for the molten concrete to flow through the fusing groove.

(Embodiment) FIG. 1 is an explanatory diagram showing an embodiment of the laser beam irradiation device system used in the present invention, in which a condenser lens 16 and a mirror 18 are installed above the fusing line 14 of the concrete 12. It is provided.

Also, on the left side of the mirror 18 is a laser beam oscillator 20.
is provided. The mirror 18 is a laser beam 22 oscillated by a laser beam oscillator 20.
The concrete 12 passes through the condensing lens 16 and is bent by
45° to the vertical direction so as to irradiate the fusing line 14 of
The mirror 18 is tilted, and around its 45° position, the mirror 18 is reciprocated by a predetermined angle by an automatic IJI 211 (not shown), so that the laser beam 22 drops onto the concrete 12. The points oscillate within a certain width across the fusion line 14. The focusing lens 16 is for focusing the laser beam 22 bent by the mirror 18 onto the concrete 12. The entire system between the bookshelf and the laser beam irradiation bag can be moved along the fusing line 14 of the concrete 12. Therefore, the irradiation line 24 drawn on the concrete 12 by the laser beam 22 bent by the mirror 18 oscillates within a constant width W like a polygon in FIG. The constant width W across the fusion line is approximately the fusion groove 2 created by melting of concrete.
Equal to the width of 6. A shown in FIG. 2 is the moving length of the laser beam irradiation device along the fusing line during one round trip of the angular movement of the mirror 14. The values of W and a, along with the energy and travel speed of the laser beam 22, are determined experimentally to be sufficient to expel the molten dross 28 to the sides and below the fusing groove 26.

The molten concrete 28 flows through the fusing groove 26 from a high place to a low place under the action of gravity, and is removed from the sides and below of the fusing groove 26.

(Effects of the Invention) The present invention performs concrete fusing while vibrating a laser beam in a certain width using a mirror, so that the concrete within the certain width is melted, and therefore the width of the concrete fusing groove can be expanded. The molten concrete is not caught or clogged in the fusing groove, and is discharged to the sides and below the fusing groove. Therefore, the laser beam is irradiated onto the unmelted concrete that has newly appeared on the surface due to the jJF removal of the molten concrete, and the energy of the laser beam is used to melt the concrete, reducing the fusion depth of the concrete by the laser beam. The depth can be set to a depth corresponding to the energy of the laser beam.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing one embodiment of the system of the laser beam irradiation device used in the present invention, and FIG. 2 is an explanatory diagram showing an example of the laser beam irradiation device system used in the present invention, and FIG. FIG. 3 is an explanatory diagram showing the state of irradiation rays and concrete, and FIG. 3 is a perspective view showing a conventional concrete melting method using a laser beam. 12...Concrete 14...Fusion line 18-...
Mirror 20... Laser beam oscillator 22... Laser beam 24... Laser beam irradiation line 26... Fusing groove 28... Molten dross Figure 1 Figure 2 b Figure 3

Claims (1)

[Claims] A laser beam emitted from a laser beam oscillator is bent by a mirror, and the laser beam bent by the mirror is irradiated onto the melting line of the concrete, and the mirror is moved back and forth by a predetermined angle to cause the laser beam to be bent by the mirror. The irradiation point of the laser beam that falls on the concrete is vibrated within a certain width across the fusing line, and the concrete within that certain width is melted, thereby widening the width of the fusing groove in the concrete, and the melted concrete is A method for fusing concrete using a laser beam, characterized in that the fusing groove is expelled to the side and below the fusing groove.