JPH055282U - Laser focusing head - Google Patents

Abstract

(57) [Abstract] [Purpose] In laser processing, a condensing head having lenses with different focal lengths that correspond to the processing application (cutting, welding, heat treatment, etc.) and the dimensional changes such as the material and plate thickness of the workpiece. Can be easily converted. [Structure] Two or more lenses 1 with different focal lengths are equipped, and each has a mechanism that can adjust its position (up and down, left and right) independently. [Effect] If the lenses 1 with different focal lengths to be mounted are adjusted in the vertical and horizontal directions in advance, it will be possible to respond instantly to the processing application and the dimensional changes such as the material and plate thickness of the workpiece. Switching is now possible.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a head portion for condensing a laser beam of a laser processing apparatus which irradiates a laser beam on a workpiece to perform laser processing.

[0002]

[Prior Art]

 FIG. 2 is a sectional view showing a conventional laser focusing head. In the figure, 1 is a lens that focuses the laser beam, 2 is a jacket that holds the lens 1 and protects it with water cooling, 3 is cooling water piping that returns water to the jacket, and 4 is an atmosphere for laser processing. Assist gas pipe to control, 5 is an adapter for adjusting the focal position of the lens 1 (Z axis), 6 is a nozzle tip, and 7 is adjustment so that the laser beam comes to the center of the nozzle tip 6 (X-Y direction). A moving part bearing 8 is a slider for mounting the laser focusing head on the main body of the laser processing machine.

FIG. 3 is a component diagram of a focusing head having different focal lengths (Fa, Fb). In the figure, parts corresponding to those in FIG. 2 are designated by the same reference numerals. Reference numerals 1a and 1b are lenses having focal lengths Fa and Fb, respectively, and 2a, 2b and 5a and 5b are jackets and adapters for holding the lenses having different focal lengths, respectively.

Next, the operation and the component configuration will be described. In Fig. 2, the laser beam emitted from the laser processing device (laser oscillator) is guided from the upper part of the figure to the lower part (workpiece) and focused by the lens 1 at the focal length of the lens to irradiate the workpiece. It is processed (cutting, welding, heat treatment, etc.). At that time, cooling water is circulated to the jacket 2 through the pipe 3 to suppress the thermal lens effect (heat or not) given to the lens 1 by the laser beam.

The positional relationship between the laser beam and the condensing head (lens 1) is adjusted in advance, but it is difficult to guide the laser beam completely to the center of the lens 1. Therefore, the movable part bearing moves in the XY directions. Fine adjustment is performed so that the laser beam is focused on the center of the nozzle tip 6. The lens 1 has individual focal lengths F, but there are some variations unique to it, and it is necessary to adjust the position (Z direction) depending on the material and size of the work piece. By adjusting the upper and lower sides of the adapter 5, the position of the focal length F with respect to the workpiece and the proper positional relationship between the workpiece and the nozzle tip 6 are determined.

FIG. 3 shows a component structure of a conventional focusing head of lenses 1a and 1b having different focal lengths Fa and Fb. There are two ways to do this, one is to replace the focusing head, which consists of parts with different focal lengths Fa and Fb, from the slider 8 to the bottom, as shown in Fig. 3, and another one. This is a method in which a condensing head with one of the focal lengths is used as a unit, and the lens 1. jacket 2. adapter 5 with a different condensing head with another focal length is replaced.

[0007]

[Problems to be solved by the device]

 Since the conventional condensing head is configured as described above, a condensing lens with a different focal length is used depending on the processing application, the material of the work piece, the plate thickness, etc. There were problems such as the need to replace the jacket and adapter, and the replacement of the cooling water piping and assist gas piping and the adjustment of the focal length in the Z-axis direction each time the adapter was replaced.

The present invention has been made to solve the above-mentioned problems, and it is possible to replace the condensing heads having different focal lengths by unitizing the parts that conventionally required replacement and sliding them in a single preparation. The purpose is to obtain a device that is possible.

[0009]

[Means for Solving the Problems]

 The laser condensing head according to the present invention has an integrated jacket for holding two lenses having different focal lengths, and has a single function of adjusting in the vertical (Z) direction and the left-right front-back (XY) direction, respectively. It is a unitized one that also uses the assist gas pipe.

[0010]

[Action]

 Since the laser condensing head in this invention is integrated with lenses having different focal lengths, the cooling water system and the assist gas piping are shared, and the lens holder jacket is set according to the difference in focal lengths. The preparation section (movable section) in each direction is standardized (standardized), and one unit processes different applications and materials with different materials and plate thicknesses.

[0011]

【Example】

 Example 1. An embodiment of the present invention will be described below with reference to the drawings. In Fig. 1, 1a and 1b are lenses having different focal lengths Fa and Fb for condensing the laser beam, 2 is an integrated jacket that holds the lenses 1a and 1b and is protected by water cooling, and 3 is an integrated jacket. Cooling water piping for sending water back to the, 4 is an assist gas piping for controlling the atmosphere of each of the lenses 1a and 1b to be laser-processed, the same as above. ), 6 is a nozzle tip, 7 is a movable part bearing that adjusts the laser beam so that it comes to the center of the nozzle chip 6 (X-Y direction), and 8 supports this integrated jacket and supports it to the laser processing machine body. It is a slider for mounting.

Next, the operation will be described. The laser beam emitted from the laser processing device (laser oscillator) is guided from the upper part to the lower part (workpiece), is focused by a lens, and is irradiated to the workpiece to be processed. At that time, it is necessary to change the focal length (Fa, Fb) of the lens depending on the processing application (cutting, welding, heat treatment, etc.), material and size (plate thickness, etc.). In this device, the lenses 1a and 1b having different focal lengths (Fa, Fb) are mounted on the integrated jacket 2, so that the slider 8 is used to move to the position of the lens suitable for the purpose in the laser beam path. To do. Incidentally, it is necessary to adjust the focal length F of the lens in the Z direction and the position of the laser beam and the nozzle tip 6 (the XY direction), which have already been described in the prior art, to appropriate positions. is there.

Example 2. In the above embodiment, two lenses having different focal lengths are integrated into one unit, but two or more lenses can be handled by the same mechanism and the same effect can be obtained. Further, in the above-mentioned embodiment, the mechanism of sliding to the left and right has been described, but the same effect as in the above-described embodiment can be obtained even if sliding in the front-rear direction and the circumferential direction.

[0014]

[Effect of the device]

 As described above, according to the present invention, two or more lenses having different focal lengths are integrated into one unit, the cooling water pipe and the assist gas pipe are shared, and the position adjustment (Z and XY directions) is common. Since it is configured to be integrated, there is an effect that the setup time for replacing the laser focusing head depending on the material of the work piece, the plate thickness, etc. can be shortened.

[Brief description of drawings]

FIG. 1 is a side view and a front view of a component structure showing a laser focusing head according to an embodiment of the present invention.

FIG. 2 is a sectional view showing a conventional laser focusing head.

FIG. 3 is a component diagram showing a conventional laser focusing head having lenses with different focal lengths.

[Explanation of symbols]

 1 Lens 2 Integrated Jacket 3 Cooling Water Pipe 4 Assist Gas Pipe 5 Adapter 6 Nozzle Tip 7 Moving Part Bearing 8 Slider

Claims (1)

Claims for utility model registration 1. In a laser processing apparatus for performing laser processing by irradiating a workpiece with a laser beam, a plurality of lenses having different focal lengths for converging the laser beam are provided. , The jacket that holds the lens is integrated, and each has a function to adjust in the up and down (Z) direction and left and right front and back (X-Y) direction individually, and it is a unit that shares cooling water and assist gas piping. Laser focusing head.