JPS61245991A - Laser beam cutting device - Google Patents

Abstract

PURPOSE:To make the cutting of a material to be cut in a free shape by attracting and fixing attachably and detachably the material to be cut to the inside peripheral surface of a drum and applying the forward and backward motion in the center line direction and the rotating motion around the center line in the central part of the drum to a processing head. CONSTITUTION:The material 36 to be cut such as cloth is disposed around the inside peripheral surface of the drum 2, i.e., the inside surface of a honeycomb structural body 8 and is attracted thereto by the negative pressure air sucked through a suction port 10 into an evacuation chamber 11 in the stage of cutting. The processing head 3 is moved in the drum 2 in this state and is guided to the prescribed position of the material 36 by the command from a numerical control device 6. A laser oscillator 4 is then operated to irradiate laser light on the prescribed position of the material 36. The laser light is so irradiated that the material 36 can be cut. The device 6 rotates a DC servocontrol motor 36, etc. according to the processing pattern inputted preliminarily thereto to move forward and backward and rotate the head 3. The material 36 is thus cut to the prescribed shape by the laser light.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention removably supports a material to be cut on the inner peripheral surface of a fixed drum, and controls the rotary movement of a processing head within the drum and the center of the drum. The present invention relates to a laser cutting device for cutting the above-mentioned material to be cut into an arbitrary shape by moving back and forth in a linear direction.

Conventional technology Conventionally, cutting devices using lasers are flat.

Japanese Patent Publication No. 52-151156 discloses a device in which the processing head is moved parallel to the X-Y coordinate axis on a flat cutting table, and Japanese Patent Publication No. 51-40677 uses a honeycomb conveyor.
Disclosed in each issue.

In these conventional technologies, the processing head is moved in parallel in the X-Y coordinate axis direction, so when cutting a large area of material, the range of movement of the processing head also becomes large, resulting in an increase in the size of the equipment and the need for installation. The space had to become larger. In addition, the routing of the laser beam,
Optical axes must be aligned in the X-axis and Y-axis directions, which complicates the configuration of the movable parts and the arrangement of the optical path and electric wires.

Problems to be Solved by the Invention Herein, an object of the present invention is to solve the problems of the prior art described above, based on a completely new idea, to improve the movement of the processing head side while keeping the material to be cut fixed. The present invention also aims to make it possible to cut into any shape using only rotational motion, and to miniaturize this type of cutting device.

Means for Solving the Problems Therefore, the present invention fixes the material to be cut on the inner circumferential surface of a fixed drum by means of uniformly adsorbing it in a removable state, and aligns the center line at the center of the drum. The material to be cut can be cut into any shape by providing forward and backward movement in the direction and rotational movement about the center line.

Here, the processing head is supported by a drive device so as to be movable in the direction of the center line of the drum, and is supported so as to be rotatable about the center line. These rotational motions and axial forward and backward motions are controlled by a numerical control device attached to the drive device. The processing head irradiates the inner circumferential surface of the drum while focusing laser light from a laser oscillator, and uses the energy to cut the material to be cut into a predetermined shape. The stationary drum consists entirely of a honeycomb structure and is fixed within the casing. The inside of this casing constitutes an exhaust chamber, in which the material to be cut that is in contact with the inner peripheral surface of the honeycomb structure is supported by suction by negative pressure air, and the suction can be stopped when necessary. This allows the material to be cut to be removed. This exhaust chamber also has the function of sucking in smoke during cutting and exhausting it to the outside.

The honeycomb structure is made of a material that reflects laser light and is difficult to be cut by it, such as aluminum, copper, or an alloy thereof, and has a honeycomb shape.

Configuration of the Embodiment FIGS. 1 and 2 show a laser cutting device 1 of the present invention. This laser cutting device 1 mainly includes a fixed drum 2, a processing head 3 that can rotate and move forward and backward inside the drum 2, a laser oscillator 4 that sends laser light 7 to the processing head 3, and the processing head 3 and a numerical control device 6.

The drum 2 is formed into a cylindrical shape by a honeycomb structure 8 made of aluminum, copper, or an alloy thereof, and is fixedly supported inside a casing 9. This casing 9 forms within it an exhaust chamber 11 that communicates with the suction port IO. Note that one opening surface of the drum 2 serves as an entrance/exit 12 for the processing head 3.
Further, the other opening surface is used as an auxiliary exhaust port 13 if necessary.

The processing head 3 is arranged inside the drum 2 in the diametrical direction of the drum 2, and is supported by a hollow support arm 15 by a hollow shaft 14 extending in the direction of the center line of the drum 2.
It is rotatably supported inside by a plurality of bearings 16. Further, the processing head 3 is connected to the drum 2 by a slide plate 17 that is movable in the radial direction of the drum 2.
The condenser lens 20 is held at the tip of the mirror 18 and the lens barrel 19 in the radial direction at an angle of 45° with respect to the optical axis position of the center line.

Note that the slide plate 17 is connected to a DC servo motor 21 attached to one end of the processing head 3 and a feed screw unit 22 that connects the DC servo motor 21 and the slide plate 17.
It is designed to be driven in a state where it can be positioned by.

Further, the driving device 5 is for giving the processing head 3 forward and backward movement and rotational movement along the center line of the drum 2, and is provided on the guide surface of the upper surface of the bed 23,
is supported by a slide base 25 so as to be movable in the direction of the center line of the drum 2. This movement of the slide base 25 is performed by rotating the binion 28 that engages with the rack 29 while decelerating the rotation of the DC servo motor 26 by the reducer 27. Note that this rack 29 is attached along the direction of the guide surface of the bed 23.

Further, the rotational movement of the processing head 3 is achieved by controlling the rotation of a DC servo motor 30 attached to the column 24 using timing pulleys 31, 32 and a timing belt 33.
This is provided by rotating the hollow shaft 14.

On the other hand, the laser beam 7 is generated by the laser oscillator 4 as a laser light source, and is bent by the optical path tube 34.
The hollow shaft 14 is guided on an extension of the center line of the drum 2 and is bent again there, so that the hollow shaft 14 is
guided inside.

Then, the numerical control device 6 controls the movement of the drive device 5, that is, the rotational movement of the hollow shaft 14 and the amount of movement of the column 24, based on preset data using the amount of rotation of the DC servo motor 26.30. Control.

Effects of the Embodiment First, when cutting, the material to be cut 36 such as cloth is placed along the inner circumferential surface of the drum 3, that is, the inner surface of the honeycomb structure 8, by an appropriate means, and is exhausted by suction from the suction port 10. It is adsorbed by the negative pressure air in the chamber 11.

In this state, the processing head 3 is moved from the retreated position to the inside of the drum 2 according to a command from the numerical control device 6, and guided to a predetermined position of the material to be cut 36.

Next, the laser oscillator 4 is operated to irradiate the laser beam 7 to a predetermined position of the material to be cut 36 through the optical path cylinder 34, 35, the hollow shaft 14, the lens barrel 19, and the condenser lens 20.

At this time, the laser beam 7 is in a state where it can cut the material to be cut 36 due to its energy.

Therefore, the numerical control device 6 operates the DC servo motor 26.3.
By rotating the rotation amount of 0 based on the pre-input machining pattern data, the processing head 3 is given forward and backward movement along the direction of the center line of the drum 2 and rotational movement, and the laser beam 7 is The material to be cut 36 is sequentially moved to a predetermined position. In this way, the material 36 to be cut, such as cloth, is uniformly fixed on the inner circumferential surface of the fixed drum 2 and is cut into a predetermined shape by the forward and backward movement and rotational movement of the processing head 3. By stopping the suction by the suction port 10 after this cutting is completed, the material to be cut 36 becomes in a state where it can be removed from the inner circumferential surface of the drum 2.

A large amount of smoke is generated during this cutting process, but since the exhaust chamber 11 generates an air flow from the inside of the drum 2 to the outside using negative pressure air from the suction port 10, the smoke during cutting is always suppressed. It is dispersed inside the exhaust chamber 11 and discharged from the suction port 10 to a predetermined position. If smoke or odor is generated inside the drum 2, the smoke or odor inside can be removed by generating a suction air flow through the auxiliary exhaust port 13, which is an opening on one side of the drum 2. can be ejected into place just like those outside. Such suction and exhaust action helps purify the working environment.

Modifications of the Invention In the above embodiment, the processing head 3 is moved forward and backward by the relative movement between the bed 23 of the drive device 5 and the slide base 25. This can also be achieved by supporting the column 24 so as to be movable in the axial direction. Further, in the above embodiment, the laser oscillator 4 is fixed at a predetermined position, but the laser oscillator 4 may be attached to the column 24, for example.

Effects of the Invention In the present invention, the processing head is supported at a fixed center position of the drum in a state where it can move forward and backward in the direction of the center line, and also rotatably, and these movements are controlled by a numerical control device. Since the material to be cut supported on the inner circumferential surface is cut by laser light, the following unique effects can be obtained.

First of all, since the material to be cut is supported by the inner circumferential surface of a fixed drum, the entire device is smaller and requires less installation space than a conventional table-type cutting device.

Second, the movement of the processing head is a combination of rotational movement and forward/backward movement in the linear direction, but since the center of rotation of the processing head and the direction of laser beam entry (optical axis) are the same, the laser beam Axis alignment is only required in one axial direction (therefore, the adjustment is easily performed).

Thirdly, since only the processing head moves during cutting and the material to be cut is fixedly supported on the inner peripheral surface of the drum, a drive device for the material to be cut is not required, and therefore a mechanical drive is not required. Since the system can be made smaller, the inertia of the drive type is reduced, and the rigidity is increased, bending parts can be cut with high precision even when operating at relatively high speeds.

Fourth, an exhaust chamber is formed on the outer circumferential surface of the drum, and smoke and odors during cutting are constantly exhausted to the outside by the exhaust action of this exhaust chamber, so that the cutting operation can be carried out in a favorable working environment.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway perspective view of the laser cutting device of the present invention, and FIG. 2 is a vertical sectional view of the processing head and drive device. l... Laser cutting device, 2... Drum, 3... Processing head, 4... Laser oscillator, 5... Drive device, 6... Numerical control device, 7... Laser light, 8... Honeycomb structure, 9
...Casing, 10..Suction port, 11..Exhaust chamber, 1
3...Auxiliary exhaust port, 14...Hollow shaft, 15...Support arm, 18...Mirror, 21.26.30...DC servo motor, 22...Feed screw unit, 25...Slide base, 34. 35... Optical tube, 36... Material to be cut.

Claims (3)

[Claims] (1) A fixed drum that holds the material to be cut while adsorbing it uniformly in a removable state on its inner circumferential surface, and a drum that is movable inside this drum in a direction parallel to the center line; A processing head that can rotate around a center line, and a laser beam emitted from a laser light source is guided to this processing head.
means for condensing this laser light and irradiating it onto the inner circumferential surface of the drum; a driving device for moving and rotating the processing head in the direction of the center line of the drum; and a numerical value for controlling the movement of the processing head. 1. A laser cutting device comprising a control device and cutting a material to be cut adsorbed onto the inner circumferential surface of the drum into a free shape. (2) The laser cutting device according to claim 1, wherein the fixed drum is formed of a honeycomb structure and is attached inside an exhaust chamber of a casing. (3) The laser cutting device according to claim 1 or 2, characterized in that one opening of the fixed drum is used as an entrance/exit of the processing head, and the other opening is used as an auxiliary exhaust port. .