JPS61159291A - Cutting method of tubular material by laser beam - Google Patents

Abstract

PURPOSE:To remove the iron powder, etc. produced in a tubular material during cutting and to improve the workability in the succeeding stage and dimensional accuracy by feeding a high-pressure gas or liquid, etc. into said material from the aperture thereof along the longitudinal direction thereof. CONSTITUTION:The long-sized tubular material P is fed by various feed mechanisms and the part intended to be cut is positioned right under a laser beam head 2. Said material is then clamped and held by means of fixing jigs 1. High-pressure air is fed from a pipe 3 into the positioned material P through the aperture at the top end thereof toward the cutting part along the longitudinal direction thereof and at the same time, a laser beam L, B for cutting is irradiated toward the material P, by which the material is cut. The iron powder, etc. generated during the cutting operation are forcibly discharged from the aperture at the rear end of the material P. The sticking of the iron powder, etc. produced in the cutting stage to the inside of the pipe is thereby prevented and therefore the workability, etc. in the succeeding stage such as drawing are improved.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to a method for cutting a tubular object using a laser beam, and more particularly to a method for cutting a tubular object by using a laser beam. This is an improved invention for cutting a tubular object supported by a tool by irradiating it with a laser beam.

(Prior Art) Structures using tubular materials are relatively common, such as handrails attached to buildings, amusement equipment in parks, and frames for two-wheeled vehicles such as bicycles and motorcycles.

When these tubular products are cut to a predetermined length depending on the intended object, press cutting is most often used. The reason for this is that other cutting methods, such as milling, are extremely time-consuming and inefficient; plasma cutting is difficult to maintain uniform dimensional accuracy; Cutting with a laser beam is completely unsuitable for cutting pipe joints into irregular shapes, as shown in Figure 2, and laser beam cutting has the disadvantage that it is completely unsuitable for cutting pipe joints into irregular shapes, as shown in Fig. Particles adhere to the inner surface of the tubular object and cannot be easily removed, causing damage to the dies for drawing the tubular object in the subsequent process, accelerating its wear, or damaging the drawn tubular object. This is because, in addition to leaving a large number of scratches on the surface, there are problems with maintenance, such as stopping leta staining of the cleaning liquid in the cleaning tank for removing flux and increasing the frequency of cleaning the cleaning tank.

(Problems to be Solved by the Invention) However, press cutting of tubular objects is not without problems. In other words, it is necessary to prepare a large number of molds for press cutting, and as a result of applying pressure in a certain direction to the tubular body, some deformation of the cutting opening is unavoidable, and relatively high precision is required. There is a problem in that it is unsuitable for structures where

(Means to solve the problem) On the other hand, laser beam cutting is an efficient means of cutting tubular objects, except for the problems of various harmful effects caused by countless particles such as iron powder generated during cutting as described above. Also,
It can also be said that this method is perfect in terms of accuracy.

Therefore, the present invention focused on various advantages of the laser beam cutting method, and was devised as a result of research to put it into practical use. , or when cutting a tubular object supported by a jig that has the function of advancing and retracting the tubular object in the longitudinal direction or rotating it in the circumferential direction by irradiating a laser beam, It is characterized in that a high-pressure gas such as air or a liquid such as water is sent along the longitudinal direction toward the cut portion.

(Example) The specific content of the present invention will be explained below with reference to an embodiment in FIG. The radar of
A head irradiates the beams L and B, and 3 indicates a pipe for pumping high-pressure air into the tubular object P.

The jig 1 not only fixes and clamps the fed tubular object P at a predetermined position from the circumferential direction, but also moves freely forward and backward by a certain distance in the longitudinal direction of the tubular object based on a preset program. It can also rotate freely in the circumferential direction.

Also, the tip of the pipe 3 is a tubular object P that is fed into the pipe 3.
It faces into the opening at the tip of the tube, and if necessary, it can advance and retreat a certain distance in the longitudinal direction of the tubular object, or it can freely escape to a position where it deviates from the direction of movement of the tubular object and advance in the longitudinal direction of the tubular object. is made so as not to interfere with

In the above embodiment, the head 2 that irradiates the laser beams L and R is fixed, and the laser beams L and R are fixed. 4.1 is configured to be movable in the longitudinal direction or the circumferential direction of the tubular object P, but it is not necessarily limited to this.On the contrary, the head 2 that fixes the jig 1 and irradiates the laser beams L and B It may be configured such that it can be moved along the longitudinal direction or circumferential direction of the tubular object P.

(Function) In the configuration of the embodiment described above, the long tubular object P is fed in the longitudinal direction via various feeding mechanisms (not shown),
The jig 1 is clamped and held at a position relatively close to the part to be cut. The jig I responds in accordance with a preset program and moves the tubular object P back and forth in the longitudinal direction to determine the required length of the tip of the tubular object P to position it for cutting. In this case, when drilling an irregularly shaped mounting hole in the side surface of one tubular object for joining the tip of the other tubular object as shown in FIG. 2, the above jig 1 is used. rotates not only in the longitudinal direction of the tubular object P but also in the circumferential direction of the tubular object P, and determines the cutting start position according to a preset program and ram.

For the positioned tubular object P, high pressure air is sent from the pipe 3 toward the cutting section along the longitudinal direction from the opening at the tip of the tubular object P. At the same time, laser beams L and B for cutting are sent from the head 2 to cut the tubular object P. The beam is irradiated towards the object and the cutting operation begins. At the start of cutting, the jig 1 rotates at a constant speed in accordance with the cutting speed of the laser beams L and H, and completes cutting over the entire circumference while rotating the tubular object P in the circumferential direction.

During the above-mentioned cutting operation, the particles such as iron powder generated in the pipe when the laser beams L and B cut the tubular object P are deposited in the pipe by the high-pressure air pumped from the pipe 3. It is blown away along the longitudinal direction of the tubular object and is forcibly discharged rearward from the 1& end opening of the tubular object P. In this case, it is preferable that the rear part of the tubular object T) (7'') be provided with a vacuum device for sucking out particles such as iron powder.

After cutting is completed, the clamp on the tubular object is released using jig No. 1, and the tubular object P is further advanced a certain length forward in the hand direction, and then the tubular object P is clamped and held again by jig No. 1, and The procedure described above is used to repeatedly cut the tubular object.

In addition, in the embodiment shown in "-", when cutting the tubular material P,
Although we have shown a case where high-pressure air is used as a means of blowing away particles such as iron powder that are being forced into the tubular storeroom, the method is not limited to this, and cutting work using a laser beam can be carried out within the range of not damaging the book and causing ignition and other dangers. It is selected from among suitable gases or liquids and used under the free circumstances and physical environment.

(Effects of the Invention) As described above, when a tubular object is irradiated with a laser beam to cut it, the present invention sends high-pressure gas or liquid along the longitudinal direction from the opening of the tubular object toward the cutting part. Because of this, the laser beam does not blow away the countless particles of iron powder and other particles that are generated inside the tube during cutting before they adhere to the inside of the tube. It does not damage the drawing dies for tubular objects or accelerate their wear.
Moreover, not only will there be no scratches on the drawn tubular object or contamination of the cleaning tank for removing flux from the tubular object, but the laser beam cutting will also reduce the work time. It exhibits various beneficial effects such as extremely good properties and dimensional accuracy.

[Brief explanation of the drawing]

Fig. 1 is a principle explanatory diagram showing how a tubular object is cut by a laser beam device according to an embodiment of the present invention, and the second part is an enlarged perspective view showing an example of joining the cut tubular object. . ■・・・Jig 2・・・Head 3
・・・・・・Pipe inventor Sai Kei - Husband

Claims (1)

[Claims] Fixed to the movable laser beam irradiation head,
Or, when cutting a tubular object supported by a jig that has the function of advancing and retracting the tubular object in the longitudinal direction or rotating it in the circumferential direction by irradiating a laser beam, air may be trapped inside the tubular object during cutting. A method for cutting a tubular object using a laser beam, characterized in that a high-pressure gas such as or a liquid such as water is sent along the length of the object toward the cutting section.