JPS6163387A - Laser beam machine - Google Patents

Abstract

PURPOSE:To obtain a titled device for executing easily laser working even in a pipe to be worked of a thin diameter by inserting a circular condensing device so as to be turnable up and down in a cylindrical work to be worked, selecting and rotating up and down a built-in laser light reflecting mirror by an internal motor, and focusing to a welding point. CONSTITUTION:A circular condensing device 10 is inserted into a metallic pipe 6 so as to be turnable up and down 16 in the outside. A right angle reflecting mirror 7 in the condensing device 10 is moved up and down or rotated by a bottom motor of the device 10 and selecting clutches 12a, 12b and a laser light condensing lens is focused to an object to be worked in the metallic pipe 6. Accordingly, laser working is executed easily even in a thin diameter pipe by turning up and down 16 a focusing and working position by a control device 9.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a laser processing device, and particularly to a laser processing device for processing the inner surface of a pipe.

[Technical background of the invention and its problems]

Conventionally, when arc welding parts to the inner surface of a metal pipe, it was necessary to put a welding torch and hand inside the pipe and look at the weld from the outside, so the diameter of the pipe and the distance from the end of the pipe were carefully determined. is restricted. Furthermore, it may bend due to welding distortion caused by heat, and repair requires removing spatter that adheres during welding.

There is also a method of resistance welding, but this requires placing the electrode inside the metal pipe and cannot apply sufficient pressure. Therefore, it cannot be applied if the plate is thick, and there are also restrictions on distance from the end of the pipe. There is also.

Furthermore, a method of applying laser light to processing the inner surface of a pipe has also been proposed. However, in this case, the inner diameter of the pipe to be machined and the shape of the machining part are limited, and in order to make it usable, the optical system becomes complicated and large, so it becomes difficult to apply if the pipe diameter is small. [Object of the Invention] An object of the present invention is to obtain a laser welding device that can easily process the inner surface of a narrow pipe.

[Summary of the invention]

The present invention enables welding while rotating the laser beam focusing system inside the metal pipe and controlling the position of the focusing system so that the laser beam is focused on parts positioned on the inner surface of the metal pipe. This is a laser welding device that can weld even at a long distance from the end face of a small diameter pipe.

[Embodiments of the invention]

Hereinafter, one embodiment of the laser welding apparatus of the present invention will be described with reference to FIG.

In FIG. 1, a laser beam 2a emitted from a laser oscillator 1 is refracted downward by a reflecting mirror 3, this laser beam 2b is focused by a condenser lens 4, and this condensed laser beam 2c is The laser beam 2d is laterally refracted by a reflection mirror 7 installed in the device 10, and the refracted laser beam 2d passes through a condenser 10Vl: a hole 10a provided therein.
The workpiece 5 is irradiated from the beam.

At this time, if the distance from the reflection mirror 7 to the irradiation part of the workpiece 5 changes, the entire condensing device is moved up and down, and the reflection mirror 7 installed in the condensing device 1o is moved by the drive motor 8. Move it up and down to change the focal point. Further, a reflection mirror 7 mounted in a condenser 10 to correspond to the welding length is rotated in the circumferential direction by a drive motor 8, and the workpiece 5 is continuously irradiated with the laser beam 2d. be welded. 9 is a control device that controls the laser oscillator 1, the drive motor 8, and the condensing device LO1 clutch 12.

Further, the upper end of the condensing device 10 is held by a gripping portion (not shown) and inserted into and removed from the metal vibro.

Next, I will explain the operation of this laser welding device.

Since the laser beam used in this embodiment can be focused with high energy density, the region irradiated with the laser beam is rapidly heated and melted, and the melted region reaches the metal pipe. Furthermore, after the irradiation is stopped, the heat is quickly transferred to the metal pipe, which has a larger heat capacity than the heating section, so there is less distortion.

Figure m2 shows a detailed diagram of the condensing device 1o.

In the second stage, when the drive motor 8 is rotated, the gears 11a and llb are rotated, and when the reflection mirror 7 is moved up and down, the shaft 13 is rotated when the clutch 12a is connected, so the drive motor 8 is rotated in the forward and reverse directions. It can be raised or lowered by doing this. At this time, since the reflecting mirror 7 is guided by the support 14, it can move smoothly without shaking.

Next, when rotating the reflecting mirror 7 in FIG. 2, the drive motor 8 is rotated to rotate the gears 11a and Hb.

Shaft 15 and clutch 12b directly connected to gear 11b
The rotational force is transmitted in the order of 1 gear lid to rotate the reflective mirror 7 via the gear 11G fixed to the reflective mirror 7.

Next, another embodiment of the present invention will be described with reference to FIG.

In FIG. 3, the entire condensing device 1o of FIGS. 1 and 2 is rotated by a condensing device rotating mechanism 16 installed outside the pipe.

With this purchase, when processing the inner surface of a pipe all the way around the circumference - for example, when butt welding a pipe from the inner surface of the pipe - the exit of the laser from the condenser 10 can be limited to one location. Therefore, it is also advantageous in shielding the welding atmosphere.

Furthermore, it can be applied to welding from the inner surface of a cylindrical object in which the diameter of one metal pipe varies continuously or intermittently. Furthermore, by replacing the reflecting mirror 7 with a different angle, fillet welding can be performed by irradiating the laser beam 2d obliquely onto the W workpiece 5. In addition to welding, it can also be used for heat treatment and cutting.

Furthermore, in the embodiments shown in FIGS. 1 and 2, if the distance between the reflecting mirror 7 and the workpiece 5 is constant, the condensing lens 4 can be modified by using a concave reflecting mirror 7. May be omitted.

[Effects of the invention]

As explained above, according to the laser welding device of the present invention,
A laser beam reflecting mirror, a focusing device including a drive motor and a pair of clutches that rotate and move the reflecting mirror in the axial direction are inserted into a workpiece having a cylindrical base, and To obtain a laser welding device that can easily perform processing such as bath welding of a cylindrical feed because it can weld with a program that is suitable for welding. Can be done

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the laser welding apparatus of the present invention, FIG. 2 is a sectional view of a main part of FIG. 1, and the third part is a block diagram showing another embodiment of the present invention. 1... Laser oscillator 2... Laser beam 3.
...Reflection mirror 4...Condenser lens 5...Workpiece 6.Metal pipe 9...Control device
10...Light condensing device (7317) Agent Patent attorney Kensuke Chika (and 1 other person) Ward 1, Figure 2, Figure 3

Claims (1)

[Claims] In a laser processing device that processes a workpiece in a cylindrical hole by irradiating a laser beam transmitted from a laser transmitter with a reflection mirror according to a predetermined program, the reflection mirror is oscillated and the workpiece is rotated along the axis of the cylindrical hole. A light condensing device having a built-in drive mechanism having an axial drive shaft for moving the light condensing device in the cylindrical hole, and a control device controlling the condensing device according to the program. A laser processing device characterized by the following.