JP2899231B2 - Cutting method of metal plate - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting method for separating ear dust from a metal plate.

[0002]

2. Description of the Related Art As-rolled metal plates (such as steel plates, hereinafter referred to as steel plates) are generally cut and removed, that is, treated with ears, in order to adjust the size to a predetermined product size. Most of these ear dusts are metal strips having a narrow strip shape, and are often plural in a longitudinal direction. The reason why the number of ear dust is plural is that the length of each ear dust is limited to about 1.6 to 2.0 m or less from the viewpoints of handling, dimensional limitation of a scrap container arranged downstream, and the like. It is. As this cutting method, for example, fusing using various energy sources such as laser cutting and gas cutting is adopted.

[0003] By the way, a method of separating ear dust from a steel plate by fusing is conventionally performed by a process as shown in FIG. 1, and the cut ear dust is collected in a scrap storage container provided downstream and collected as scrap. Is done. Now,
In FIG. 1, in the case of fusing the ear dust 2 composed of the ear dust 2 a, 2 b, 2 c extending in the longitudinal direction from the steel plate 1, the conventional cutting process includes a cutting path indicated by a solid line, and a dotted line. Along the indicated moving path (a path only for moving the cutting nozzle without cutting by a method such as fast-forwarding), the cutting is performed in the order of ~. Here, the longitudinal direction of the cutting step of the ear debris end position p _a, p _b was a position corresponding to the length of each Mimikuzu 2a, 2b.

[0004]

However, the above conventional method has the following disadvantages. That is, as shown in FIG. 2, when cutting along the cutting path is completed after cutting along the cutting path, the cut ear dust warps upward due to thermal deformation. The warped ear dust is warped and held on the gantry 4 supporting the steel plate. In this state, when starting cutting of ear dust after the following, the height of the cutting nozzle from the steel plate surface cannot be copied due to the warpage, and the cut surface becomes rough or the cutting is interrupted. Problems often occurred.

An object of the present invention is to propose a novel method capable of stably obtaining a high-quality cut surface without causing the above-mentioned problem when cutting off ear dust by fusing. is there.

[0006]

According to the present invention, a metal plate on a gantry is cut by a single cutting nozzle along the longitudinal direction of ear dust and then along the short side direction. , In the method of separating the ear dust, the longitudinal direction of the ear dust,
Cut longer than the expected length of ear dust , retreat backward in part of this cutting path, cut the short side direction at this retreated position, and then re-lengthen from the end position of the longitudinal cutting path. This is a method for cutting a metal plate, characterized by cutting a direction and repeatedly removing ear dust. Here, the cutting length in the longitudinal direction is 10 to 10 times longer than the expected length of the ear dust.
It is preferable to make the length longer in the range of 0 mm.

[0007]

The present inventors investigated by means of a lab test and an actual machine test a method in which the warpage due to thermal deformation is small, and even when the warpage occurs, the method has little effect on the subsequent cutting process. As a result, it has been concluded that the above-mentioned problems can be solved all at once by employing the cutting process as shown in FIG.

FIG. 3 shows that the steel sheet 1 extends in the longitudinal direction.
Ear dust 2a, 2b, 2c
In the case of separation, the cutting step according to the method of the present invention is shown.
Things. In FIG. 3, in the method of the present invention, a solid line is used.
The cutting path, and the travel path indicated by the dotted line
Road (cutting is not performed by a method such as rapid traverse.
The only path to travel) and along the
It is performed in order, and the major difference from the conventional method is that
Direction cutting path and each end position q_aAnd q _b
Is the expected length of the ear dust (l in FIG. 3)._a, L_bMake it longer
And

As described above, by increasing the end position of the cutting path in the longitudinal direction, for example, when cutting off the ear dust 2a, even if the ear dust is warped after cutting along the path, the cutting nozzle can be moved along the path. the not pass, it is only necessary to move to q _a along the path, following the height of a steel plate surface is performed without any problem without being obstructed by the warp, start cutting for separation next ear scrap smoothly , Can be advanced. Here, the cutting length in the longitudinal direction in the present invention,
Any length may be used as long as it is necessary to prevent the interference between the cutting nozzle and the upwardly warped portion of the ear dust, and the length is preferably longer in a range of, for example, 10 to 100 mm than the expected length of the ear dust. . Although the movement route is represented by a straight line in FIG. 3, the starting point q _{a of} the next longitudinal cutting of the ear dust, q _a ,
Since only good moves to q _b, itself be moved linearly is not necessarily required.

FIG. 4 shows another embodiment of the cutting step according to the method of the present invention. In the case of FIG. 4, the cutting is performed in the order of 切断 along the cutting path indicated by the solid line, and the moving path indicated by the dotted line. In this case, compared to the case of FIG. 3 described above,
It is the same in that the end positions q _a and q _b of the longitudinal cutting path are longer than the expected length of the ear dust, but differs in that the order of the cutting path in the short side direction and the moving path are reversed. I do. The effect obtained in this case is almost the same as that obtained in FIG.

[0011]

[Example] A plate thickness of 16 mm and 2500 mm x 6800 m
m from the width end of steel plate (steel type: JIS SS400), width 2
An ear dust cutting process in which four 00 mm and 1700 mm long ear dusts were connected was performed. Laser cutting method (output: 5)
000 W) and the cutting speed was 1200 mm / min. In the method of the present invention (using the method shown in FIG. 3), the cut length in the length direction of the ear dust was set to the expected ear dust length + 100 mm. For comparison, cutting by the conventional method was performed in the same manner.

As a result, according to the method of the present invention, from the start of cutting to the end of all the cuttings of ear dust, there was no trouble and a sound cut surface was obtained. On the other hand, in the comparative example, the height of the cutting nozzle could not be copied, the cutting groove did not reach the back surface, gouging and burning occurred, and good cutting could not be performed.

[0013]

As described above, according to the present invention, the nozzle height can be smoothly adjusted from the steel plate surface.
A trouble such as interruption of the cutting operation can be prevented, and a high quality cut surface can be stably obtained.

[Brief description of the drawings]

FIG. 1 is a diagram showing a conventional cutting path.

FIG. 2 is a diagram showing a state of warpage of ear dust generated during cutting.

FIG. 3 is a diagram showing a cutting route according to the method of the present invention.

FIG. 4 is a diagram showing another embodiment of the cutting route according to the method of the present invention.

[Description of sign]

 DESCRIPTION OF SYMBOLS 1 Steel plate 2 Ear waste 3 Cutting line 4 Stand

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-34292 (JP, A) JP-A-59-193780 (JP, A) JP-A-48-96435 (JP, A) JP-A 64-64 87091 (JP, A) JP-A 2-1579 (JP, U) JP-A 62-142185 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) B23K 26/00-26 / 18

Claims (1)

(57) [Claims] 1. A metal plate on a gantry is cut by one cutting nozzle.
In the method of cutting off the ear dust, by cutting along the longitudinal direction of the ear dust and then cutting along the short side direction, the longitudinal direction of the ear dust is cut longer than the expected length of the ear dust. A part of this cutting path is reversely retracted, the short side direction is cut at the retreated position, and then the longitudinal direction is cut again from the terminal position of the longitudinal cutting path. A method for cutting a metal plate, comprising separating the metal plate.