JPH0780638A - Cutting method of base stock with camber - Google Patents

Abstract

PURPOSE:To execute efficiently and freely cutting of plural products from as rolled plate. CONSTITUTION:In the cutting method for blank layout of a product 1 and product 2 from sound, part of the base stock having camber, when a product of one side is not taken by one coordinate system, it is subjected to nesting with dividing the coordinate system into two or more, a number of the torch used is decided based on the data about a base stock for cutting. A point for preheating start of the torch is decided based on a detected result of the front end of base stock, after both ends in longitudinal direction relative to the product 1 is cut ([1]), both ends in the width direction is cut ([2], [3]), further, with taking a, cut off margin alpha, cutting for the product 2 is executed in the same procedure as that of the product 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas cutting method for hot-rolled thick steel plate, and more particularly to removing a plate from a sound portion of an AS ROLL plate having a large camber. The present invention relates to a cutting method for performing the cutting.

[0002]

2. Description of the Related Art In a steel mill, a hot-rolled thick steel plate is cut into a predetermined product size by using a cutting machine.
This cutting method is roughly classified into mechanical cutting methods such as double side shear and end shear, and gas, plasma,
There is a fusing method using a laser or the like. The mechanical cutting method enables high-efficiency cutting, but the cutting thickness is limited.
(Currently, it is not possible to cut a steel plate with a thickness of about 50 mm or more.) Also, when performing complicated plate cutting from a single material, or when the material has a large lateral bend (camber). Not applicable.

Therefore, in such a case, the fusing method is used. Therefore, both a mechanical cutting machine and a fusing-type cutting machine are generally installed in a plate rolling mill. It should be noted that cutting by the fusing method (hereinafter collectively referred to as gas cutting) requires a large number of man-hours as compared with the mechanical cutting method, productivity is low, and the working environment is bad, so labor saving in recent years. The promotion of automation and automation is required.

By the way, in the above-mentioned gas cutting, a gas cutting machine having a gate-type structure is run on a rail, and steel plates to be cut (sides having ears and tail ends at the end) are provided on a surface plate (table). As-rolled steel plate with crops (hereinafter referred to as "material") is cut into a predetermined product size.

In this cutting operation, the material is distributed by a crane (or other conveying means) and then finished in the following procedure.

First, the operator considers the cutting margin for each material, and cuts product dimensions and required test piece dimension lines (marking lines).
Perform the cutting work while moving the cutting machine aiming at this marking line After the cutting, inspection of the cross section (especially hot water and dross residue, cross section roughness, crater flaw, dimensional accuracy, etc.) Carry out stamping and marking work Discharge products by crane or other transportation means

[0007]

When automatically cutting using NC, it is essential to input the numerical value, but the cutting pattern for taking a plurality of products or a test piece (TP) from one material is a product. Since there are various specifications, the numerical input operation to the NC machine is complicated, and there is a problem that the degree of freedom of cutting is inefficient and inferior. In particular, there are many restrictions on plate cutting from a material with a large camber, so the degree of freedom is further reduced.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method of cutting a material having a camber, which enables highly efficient and flexible cutting from an az roll plate.

[0009]

In order to achieve the above object, the present invention provides a cutting method for cutting a plurality of products from a sound part of a material having a camber by using a cutting machine. When the cutting of the plurality of products cannot be performed based on one coordinate due to the possession, the cutting is performed by dividing into at least two coordinates.

[0010]

According to the above-mentioned means, the material having the camber is divided into blocks from the sound portion in the teaching line, and a plurality of products are cut in block units. As a result, even with an as-roll material having a camber, a plurality of products can be efficiently and freely cut from this material.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an explanatory view for explaining a method of cutting a material having a camber according to the present invention. Further, FIG. 2 is an explanatory diagram showing a nesting process necessary for the cutting process,
FIG. 3 is a plan view showing a schematic configuration of a steel plate cutting line to which the cutting method according to the present invention is applied.

As shown in FIG. 3, the transfer table 10, N
Scribing device 12 by C (numerical control), plasma and gas cutting machine 14 by NC, gas cutting machine 16 by NC
Each of the cutting machines 14 and 16 is provided with a cutting platen, respectively, and is continuously arranged in a straight line. A temporary storage area 18 is provided in parallel with this line, and a transport table 24 is provided in parallel with the temporary storage area 18. An engraving machine 26 and a marking device 28 are installed above the transport table 24. In addition, the marking device 12, the cutting machines 14 and 16, the temporary storage 18
An overhead crane 30 is movably arranged on the ceiling of the building so as to be movable to the upper part of each of the transport tables 24.

Marking device 12, plasma / gas cutting machine 1
4 and the gas cutting machine 16 are controlled by using a control device and a computer (not shown) for controlling the whole.
The temporary storage 18 is a place for temporarily storing the marking completion material 20 that has been marked and the cutting completion material 22 that has been cut by the cutting machine. The engraving machine 26 is used for marking numbers and symbols on the surface of the steel plate, and the marking device 28 is also used for printing numbers and symbols on the surface of the steel plate.

The product flow will be described below.
The material carried into the marking device 12 by the transport table 10 is automatically marked by the steel plate cutting device according to the present invention, and the marking completion material 20 in which marking is completed is completed.
Are carried into the temporary storage area 18. Here, the material to be cut is an as-roll material having cambers as well as ears on the sides and crops at the ends. In addition, it is assumed that a plurality of test pieces (TP) are attached to this material. In addition, there are cases in which a plurality of products are divided and cut, and cases in which plate expansion and plate reduction (switching) are performed depending on the material. Furthermore, there are also plates with poor flatness.

Now, a nesting method for cutting a steel sheet according to the present invention will be described with reference to FIG.

The product 1 and the product 2 are obtained by cutting the material in the middle.
The material loaded in No. 2 is often loaded with an inclination (plate skew angle Θ). Therefore, when doing a scribing,
It is necessary to perform it under the condition that the plate skew angle Θ = 0. Also,
The material has crops, wraps, etc., and it is necessary to avoid this and plan the product.

Therefore, in the present invention, nesting is automatically performed by the following procedure.

I Calculate the skew angle Θ II Rotate the coordinate axis III Set the marking line on the plate width side IV Search the shortest distances A1 and A2 V Determine the marking line on the plate width side (A1 = A2) ) VI Set the marking line on the plate length side VII Search the shortest distances B1 and B2 VIII Determine the marking line on the plate length side (B1 = B2) IX Each cutting coordinate point (x1, y1) to (x4, y4) The X marking screen is displayed on the X display screen (CRT of the terminal device of the computer). XI Move to the automatic cutting path setting.

By carrying out such a treatment, it is possible to carry out the plate cutting of the product in the shortest time without making a mistake.

In order to calculate the plate skew angle Θ of I, each of the coordinate points on one side of the raw material out of the coordinate points on the outer peripheral portion of the raw material read into the data creation computer at the time of teaching is linearly approximated, The inclination angle with the table edge line is the skew angle (Θ) of the material.

Next, nesting when the camber of the material is large will be described. When there is little or no camber, product 1 and product 2 can be continuously cut in one coordinate system as shown in FIG. On the other hand, as shown in (b), when the teaching line is bent in a fan shape (that is, the camber is large), it is not possible to perform planing while securing an equal distance to the inner circumference of the sound part.

Therefore, in order to improve the condition as much as possible, according to the present invention, the coordinate rotation is performed on each of the products 1 and 2 to separate the products 1 and 2 from each other, and the cutting is performed with a slight inclination. I can do it. That is, as shown in FIG. 2, when it is determined that a plurality of products cannot be cut by one coordinate, a plurality of coordinates (two in this case) are set, and the cutout position (arrangement of each product) is set according to each coordinate. )
To decide.

As for the cutting method at that time, as shown in FIG. 4B, the cutting order by the torch is [1] → [2].
... → [6]. In this case, for the material with ears, FIG. 5 (enlarged view of the portion C in FIG. 4B)
As shown in, the cutting is not performed on the line B, but the cutting is performed at right angles to the plate edge.

First, the cutting process in the case of not having a camber will be described.

FIG. 6 is an explanatory view showing a cutting procedure in the case of cutting with a cutting machine equipped with two torches. In addition, the white circles in the figure indicate the product cut start points, and the black circles indicate the cut stop points. The numbers in parentheses in FIG. 6 indicate processes corresponding to the following process numbers.

(1) First, a bar code label recording the material number attached to the material is read, and the cutting condition data corresponding to this material number is transferred from the data accumulator to the cutting machine. (2) The number of torches to be used is set (3) Reading the reference line MN (N is the origin) (4) Recognizing the plate skew angle (Θ) (5) Cutting start, A , (6) Interval between B torches is detected (Specifically, the end face at the plate front side is detected (specifically, the end faces at points a and b are detected from the inside of the product with the air height sensor). (7) Preheating of B torch ( (8) Start cutting on the B torch side (9) Stop the B torch temporarily when the preheating start point on the A torch side is reached (10) Start the A torch preheating (about 15 seconds) (11) Both the A torch and B torch Notch (12) B Toe When the chi reaches the product cutting start point, the product width is cut along the plate skew angle. (13) Width cutting toward the tail (TAIL) (Fig. 6)
[1]). At this time, continue to detect the tail end face with the air height sensor and make the torch height follow the flatness of the plate (14) Continue cutting until the end face on the far side of the tail side is detected (up to point M) (15) A torch Extinguish B and torch (16) Cross cutting on the tail side ([2] in Fig. 6) (17) Machine movement (from tail to front), Cross cutting on the front side ([3] in Fig. 6) (18) ) Machine movement (from front to middle) (19) Middle cross cutting ([4] in Fig. 6) (20) Cutting end (21) Cutting results (dimensions, torch number, cutting time, etc.) host data Transfer to computer.

Next, the cutting method according to the present invention will be described with reference to FIG. FIG. 1 illustrates an example in which a material having a large camber is divided into blocks and cut.

Since the processes (1) to (12) in the processing sequence according to the present invention are common to FIG. 1, the description thereof will be omitted. In addition, α in the figure is a medium invariant (cut-off margin), and is provided so that the product 1 and the product 2 do not intersect. Θ1 is the skew angle of product 1 and Θ2 is the skew angle of product 2. Then, in order to avoid confusion with the above-mentioned processing procedure, the numbers are distinguished by adding "'(dash)" in the following.

(13 ') Cut toward points M and K ([1]) (14') Cross cut at [2] and [3] (15 ') Read reference lines (O to P) Recognize the skew angle (Θ2) of the product 2 (16 ') Cut from the tail side by [4] as in [1] (17') Cut by [5] and [6] (18) ′) End of disconnection (19 ′) Transfer the data to the host computer.

Incidentally, in the explanation of FIG.
Although the cutting is performed by using the present invention, the present invention is not limited to this and may be 3 or more.

[0032]

Since the present invention is configured as described above, it has the following effects.

In the method for cutting a material having a camber, in the cutting method for cutting a plurality of products from a sound part of the material having a camber using a cutting machine, the plurality of products are caused by the camber. When it is not possible to cut products based on one coordinate, the cutting is divided into at least two coordinates, so even if the material has camber, multiple products can be efficiently and freely made from azroll material. Can be cut easily.

[Brief description of drawings]

FIG. 1 is an explanatory diagram illustrating a method of cutting a material having a camber according to the present invention.

FIG. 2 is an explanatory diagram illustrating a nesting process necessary for the cutting process of the present invention.

FIG. 3 is a plan view showing a schematic configuration of a steel plate cutting line to which a cutting method according to the present invention is applied.

FIG. 4 is an explanatory diagram showing a cutting method when a material has a large camber.

5 is a partially enlarged view showing details of a portion A in FIG.

FIG. 6 is an explanatory view showing a cutting procedure when cutting is performed by a cutting machine equipped with two torches.

[Explanation of symbols]

 10 Transport Table 12 Marking Device 14 Plasma / Gas Cutting Machine 16 Gas Cutting Machine 18 Temporary Storage Site 20 Scribing Completion Material 22 Cutting Completion Material 24 Transport Table 26 Engraving Machine 28 Marking Device 30 Ceiling Crane

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masahisa Yamamoto 1 Kimitsu, Kimitsu-shi, Chiba Nippon Steel Co., Ltd. Kimitsu Steel Co., Ltd. (72) Inventor Takamitsu Kobayashi 1212 Hitomi, Kimitsu, Chiba Stocks Company Kimitsu Division (72) Inventor Yoshiaki Saito Within 3-35-16 Nishikoiwa, Edogawa-ku, Tokyo Within Koike Acid Industry Co., Ltd.

Claims (1)

[Claims] 1. In a cutting method of cutting a plurality of products from a sound part of a raw material by using a cutting machine in the work of melting and cutting a required product from the raw material after rolling, the material is a camber. A method for cutting a material having a camber, characterized in that, when the plurality of products cannot be cut based on one coordinate due to the possession, the cutting is performed by dividing into at least two coordinates.