JP2001001139A - Gas cutting device and method for cast metal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a gas cutting device of low equipment price, having high efficiency for cutting, and being able to cut plural cast metals. SOLUTION: This is a gas cutting device, for cast metals, with which a cast metal, being cut in on-line after continuous casting, is cut again to the size required for rolling process in off-line. the device consists of a teaching camera 10 which recognizes four corner positions of the cast metal, an arithmetic processor 14 for cutting position which plans for taking products from cutting direction from a higher rank computer and information on the four corner positions of the recognized cast metal, and automatically determines the cutting conditions consisting of setting a running route of a cutting torch, setting its speed, timing of ignition of cutting gas and of fire extinguishing and selection of the cutting gas pressure, etc., gas cutting machine 8 which performs numerical control cutting of the cast metal, driving control device 15 which controls the gas cutting machine 8 and an end face detector 11 which detects the approach of the cutting torch 6 of the cutting machine to a planned end face for incision of gas cutting to the cast metal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slab gas for continuously cutting a slab, which has been cut continuously to a predetermined length after continuous casting, to a size required in a rolling process in the next step. The present invention relates to a cutting device and a gas cutting method.

[0002]

2. Description of the Related Art Continuously cast slabs are gas-cut immediately after casting to a predetermined length required in a rolling process, which is the next step.

[0003] However, the slabs that have been gas-cut off-line are not all rolled in the same size, but slabs of different dimensions are cut off from the first slab and rolled off in operation of the slab. Sometimes.

When slabs with different widths are manufactured by automatic mold width change during continuous casting, trapezoidal slabs with different widths at the front and rear ends are manufactured during width change. Therefore, in the case of such a slab, the slab is again cut off-line by gas cutting for shaping into a substantially rectangular shape.

Conventionally, in the case of off-line gas cutting of a slab for the above-described reason, a simple traveling rail is arranged along a scheduled cutting position on the slab, and the self-propelled rail is automatically moved along the traveling rail. A method of cutting while running a traveling gas cutting machine is general.

[0006] Although not a gas cutting of a slab, as a similar technique, there is a method of gas cutting a plurality of products having smaller dimensions from a rolled steel sheet by an automatic gas cutting machine.
It is disclosed in JP-A-7-80639.

The gas cutting device used in the gas cutting method for a steel sheet has a function of recognizing an effective range of the material from which a product can be taken out when a required product is cut off from a material after rolling by a gas cutting machine. And a numerical control marking device having a function of marking on the surface of the material, and a cutting route selection and operation route of the cutting route at the same time as planning the product taking out from the effective range of the material. Setting, a computer that automatically determines cutting conditions such as speed setting, and a plurality of cutting machines that perform numerically controlled cutting on the material, and control means for controlling the marking device and the cutting machine. And performs automatic marking and automatic cutting on the material.

[0008]

However, the conventional gas cutting method described above has the following problems.

(1) General method of off-line gas cutting of slab Each time the cutting line changes in the same slab or the slab to be cut changes, the running rail of the gas cutting machine is rearranged. Need to move the gas cutting machine,
Poor cutting efficiency.

(2) Gas cutting method disclosed in Japanese Patent Application Laid-Open No. 7-80639 is a gas cutting method intended for removing products from a steel sheet.
Since it is assumed that a plurality of products are cut out from a steel plate by so-called frame cutting, it takes time to perform an operation of recognizing an effective range of a material from which a product can be obtained and an operation of marking a surface of the material.

Also, in cutting a slab, unlike cutting when a product is cut out from a steel plate, it is not necessary to cut the slab into a complicated curved shape. Since these two sides are referred to as reference sides), the slab may be cut linearly in the length direction or width direction, so that the cutting line does not need to be marked.

Therefore, when such a cutting device is applied to cutting of a slab, the efficiency becomes poor and the device becomes too expensive.

[0013] Further, since the automatic cut-out and automatic cut-out functions are not provided, the operator must intervene in the cut-out and cut-out, and a plurality of sheets cannot be cut automatically and continuously.

Further, since no consideration is given to the processing of waste after cutting, the processing of waste is not easy.

The present invention has been made in order to solve the above-mentioned problems of the prior art, and has a low equipment cost, a high cutting efficiency, and automatically cuts a plurality of slabs. It is an object of the present invention to provide a gas cutting apparatus and a gas cutting method for a slab which can be performed easily and can easily treat waste.

[0016]

SUMMARY OF THE INVENTION A slab gas cutting apparatus according to the present invention re-cuts a slab that has been cut to a predetermined length online after continuous casting to a size required in a rolling process offline. This is a slab gas cutting device.It has a function of recognizing the positions of the four corners of the slab placed at the cutting place, and a product removal plan based on the cutting instruction from the host computer and the information on the recognized four corners of the slab. A computer for automatically determining cutting conditions, such as setting of the operation route of the cutting torch, setting of speed, timing of ignition and extinguishing of the cutting gas, selection of the pressure of the cutting gas, and the like, and the slab. A gas cutting machine for performing numerical control cutting, a control means for controlling the gas cutting machine, and an end face detector for grasping that a cutting torch of the gas cutting machine has approached an end face of the slab to be cut by gas cutting. Also composed of It is.

Further, the present invention has a function of dividing the waste generated by the re-cutting of the slab to a predetermined size or less by gas cutting during the re-cutting of the slab.

Further, the method for gas cutting a slab according to the present invention is a method of cutting a slab, which cuts a slab that has been cut to a predetermined length online after continuous casting into a dimension required in a rolling step offline. This is a cutting method in which the positions of the four corners of a plurality of cast pieces placed at the cutting location are recognized by a teaching camera, and a product is taken from a cutting instruction from a host computer and the recognized position information of the four corners of the cast pieces. In addition to making a plan, the cutting conditions including the setting of the operation route of the cutting torch, the speed setting, the ignition timing of the cutting gas, the timing of extinguishing the fire, the selection of the pressure of the cutting gas, etc., are automatically determined. Starting from the point when the slab approaches the end face of the slab to be cut by gas cutting, numerically controlled cutting of a plurality of slabs is performed based on the product removal plan and the cutting conditions.

Further, the waste generated by the re-cutting of the slab is cut into a predetermined size by gas cutting during the re-cutting of the slab.

In the gas cutting method using the slab gas cutting apparatus, since the cut-side end face of the slab to be cut is detected by the end face detector, the four corners of the slab recognized by this signal and the recognition function are used. Based on the position information, the gas cutting conditions at the time of cutting and cutting through which gas cutting becomes unstable can be automatically set separately from the gas cutting conditions at the time of steady gas cutting, and gas cutting can be performed.

Therefore, even when a plurality of slabs are cut, the position of each slab at the cutting location, in other words, the position on the coordinates of the four corners of each slab is determined. If it is grasped, it is possible to continuously cut the two adjacent sides of the slab as a reference side by a gas cutting machine which performs numerical control cutting, and the cutting efficiency is improved.

Further, since the waste generated while gas cutting the slab can be subdivided, the time required for waste processing can be shortened.

[0023]

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

FIG. 1 is a plan view showing an example of a cast slab gas cutting apparatus according to an embodiment of the present invention. The gas cutting device comprises a traveling vehicle 3 traveling on a pair of traveling rails 1 by a traveling device 2, and a transverse rail 4 disposed on the traveling vehicle 3 in a direction perpendicular to the traveling direction of the traveling vehicle 3. A gas cutting machine 8 composed of a torch truck 5 traversing above, a cutting torch 6 mounted on the torch truck 5 and a dust cutting torch 7, and four corners (tees) of a slab to be cut. A teaching camera 10 mounted on a teaching camera cart 9 traveling on the traversing rail 4 in order to teach a (teaching point).
And a slab end face detector 11 mounted on the torch truck 5 together with the cutting torch 6 and the debris cutting torch 7, and a tee for displaying an image of a teaching point of the slab. Teaching monitor-12 and teaching monitor-12
Operation key 13 for reading and inputting the coordinates of the teaching point (four locations) when the image of the teaching point matches the cross line point on the screen of the above, and the coordinate information of the input teaching point A product pick-up plan is set based on the cutting instruction from the host computer and the setting of the operation route of the cutting torch, the speed setting, the ignition of the cutting gas, the timing of extinguishing the fire and the selection of the pressure of the cutting gas. It comprises a cutting position arithmetic processing unit 14 for automatically determining cutting conditions, and a drive control unit 15 for controlling the driving of the gas cutting machine 8 for performing numerically controlled cutting.

The gas cutting device described above will be described in detail. The cutting torch 6, the dust cutting torch 7, and the end face detector 11 are arranged so as to be located on a straight line parallel to the traversing rail 4. I have. The dust cutting torch 7 has to cut the generated dust in the width direction of the slab when the cutting torch 6 is advancing to the cutting position in the length direction of the slab to make it smaller. So
It is necessary to move the slab to the widthwise end side and, at the same time, move the cutting torch 6 backward by the amount of advance. Therefore, the dust cutting torch 7 moves on the skew rail 16.

As shown in the front view of FIG. 2, the end face detector 11 includes an elevating cylinder 18 attached to a support member 17 of the cutting torch 6 and a frame connected to a lower end of the elevating cylinder 18. It comprises a reflection type optical fiber sensor 20 supported by the body 19, a detection rod 22 attached to the lower end of the frame pair 19 via a spring 21, and a spherical shaft 23. A rotation detector 24 is attached to the upper surface of the spherical shaft 23 so as to face the reflective optical fiber sensor 20 in the frame 19.

Even if a large horizontal force is applied to the detection rod 22, the detection rod 22 is prevented from rotating at the spherical axis 23 and being damaged. Therefore, the detection rod 22 can be brought into contact with the end face of the slab 25 from any direction of the slab 25.

The principle of detecting the end face of the slab 25 by the end face detection 11 is as follows. When the end face detection 11 is located outside the slab 25, the lifting / lowering cylinder 18 is lowered, and the lower end 22 a of the detection rod 22 is at a lower height than the surface of the slab 25, and Since no horizontal force acts, the spherical axis 23 is held at a fixed position by the spring 21 and the tip of the rotation detector 24 faces the reflection type optical fiber sensor -20.
Is in a state of being detected by the reflection type optical fiber sensor-20.

When the detection rod 22 comes into contact with the end face of the slab 25, a horizontal force acts on the detection rod 22. Therefore, the spherical axis 23 rotates, and accordingly, the rotation detecting body 24
Also rotates, the tip of the rotation detecting body 24 moves to a position where it cannot be detected by the reflection type optical fiber sensor-20.

That is, the end face detector 11 is provided with a rotation detector 24 which has been detected by the reflection type optical fiber sensor 20.
Of the cast slab 25
Is detected.

After the detection of the end face, the end face detector 11 is raised to a certain position by the lifting cylinder 18. Then, it serves as a sensor for preventing the cutting torch from being damaged by warpage or foreign matter of the cast piece 25.

As shown in the block diagram of FIG. 3, the cutting position arithmetic processing unit 14 includes an information processing storage unit 31, an arithmetic processing unit 32, a gas cutting condition control unit 33, and an operation unit 34.

The information processing storage unit 31 has a host computer 35
The disconnection instruction information and disconnection record data (used for reporting) sent from the server are stored. And the operation unit 3
Signals such as a cutting instruction and a cutting pattern are sent to the arithmetic processing unit 32 by the key input of 4.

In the arithmetic processing section 32, the slab 2 inputted by teaching by the teaching camera 10 is used.
Based on the shape data of No. 5, product picking is calculated, whether or not it is a different material, whether or not product picking is possible, and a calculation is performed, and a cutting execution instruction is created.

In the gas cutting condition processing section 33, based on the cutting execution instruction from the arithmetic processing section 32, the end face detector 1
Starting from the point in time when the detection signal of the end face of the slab 25 is inputted, the ignition and extinguishing timings and the moving speed of the cutting torch 6, the pressure of the supplied gas, and the elevation position of the cutting torch 6 are controlled.

Next, a method of gas-cutting a plurality of cast pieces 25 into smaller-sized cast pieces by using the cast-piece gas cutting apparatus will be described.

As shown in the plan view of FIG. 4, a plurality of slabs 25 placed in an automatic cutting area provided between two traveling rails 1 on which the traveling device of the gas cutter 8 travels. The operator operates the traveling device 2 and the teaching camera cart 9 to guide the teaching camera 10 to the teaching points 26 at the four corners.

The teaching monitor shown in FIG.
When the image of the teaching point 26 matches the cross line point of the screen 12, the operation key 13 is used to perform the teaching.
The coordinates (at four locations) of the chining point 26 are read and input to the cutting position calculation processing device 14. The input position information data is collated with the received data in the cutting position arithmetic processing unit 14, and a foreign material check and a cutability check are performed.

This teaching input is performed for all of the plurality of cast pieces 25 placed.

The slab 25 to be placed in the cutting area can be placed freely, and the inclination angle with respect to the traveling direction of the gas cutting machine 8 can be recognized by the teaching input, and two adjacent slabs that serve as the cutting reference when cutting are performed. You can decide the side.

The two adjacent sides to be used as the reference for cutting are determined by cutting the slab 25 in parallel with the longer side (side in the longitudinal direction of the slab 25) of the two sides serving as the reference. This is because, in principle, the cutting length is the length from the short side (side in the width direction of the slab 25) of the two reference sides. The two sides serving as the reference can be changed by changing the scrap position or the like.

The arithmetic processing unit 32 of the cutting position arithmetic processing unit 14 makes a product picking plan based on the input position signal of the teaching point 26 of the slab 25 and the cutting instruction from the host computer 35.

In the cutting instruction from the host computer 35, the allowable range of the width and length of the cast slab after cutting is indicated, and the product is taken so that a slab of the largest dimension can be obtained. Is determined, the yield loss after cutting is reduced.

The gas cutting condition processing unit 33 of the cutting position calculation processing unit 14 sets the operation route of the cutting torch 6 based on the cutting execution instruction from the calculation processing unit 32,
Automatically determine cutting conditions such as speed setting.

The cutting conditions determined by the gas cutting condition processing section 33 are sent to the drive control device 15, and the traveling speed of the traveling vehicle 3 of the gas cutting machine 8 and the torch vehicle 5 during cutting are transmitted.
, The timing of raising and lowering the cutting torch 6, and the pressure of the fuel gas and oxygen gas.

The end face detector 1 mounted on the gas cutting machine 8
According to 1, the short side of the reference side of the slab 25 is detected, and the cutting is started by a predetermined cutting program. This cutting program is executed in the following procedure.

Press the cutting start button. → When the cutting torch 6 comes to a predetermined position before the cutting point of the cutting material, stop the gas cutting machine 8 → Adjust the height of the cutting torch 6 (from the surface of the cutting material). (Constant height) → Lifting cylinder of end face detector 11
18 Downward → The gas cutting machine 8 advances at a very slow speed toward the planned cutting point → The detection rod 22 of the end face detector 11 touches the planned cutting point → Stops the gas cutting machine 8 → Ascends and descends the cylinder 18 of the end face detector 11 (detects The tip 22a of the rod 22 is at a certain height from the surface of the cutting material. → The cutting torch 6 moves to a certain position just before the expected cutting point. → Setting of cutting conditions (movement of cutting gas, oxygen pressure, cutting torch 6) (Speed) → advance to the cutting torch 6 for cutting → complete cutting (point beyond a certain distance from the cutting point) → switch to steady cutting conditions (cutting gas, oxygen pressure, moving speed of cutting torch 6, scraps) Cut-off instruction) → Cut-out (from the calculated end face position to a certain distance) → Stop of gas cutting machine 8 → Switching of ignition condition of cutting torch 6 (pressure of cutting gas and oxygen) → Raising of cutting torch 6 → Move to the cut point of the next cutting material.

The dust cutting torch 7 is designed to operate in accordance with a dust cutting pattern command. When the cutting torch 6 advances a predetermined distance, it is ignited and located outside the already cut portion of the slab 25. The swarf portion is cut while skewing backward, and the swarf is subdivided into a plurality of substantially rectangular masses.

FIG. 5 shows various cutting patterns when cutting a slab 25a having a smaller size from the slab 25 using the gas cutting apparatus of the present invention. The line 25b is shown, and the hatched portion is the waste 25c.

In the method of cutting a slab gas according to the present invention,
As shown in the figure, the cutting pattern and the product sampling position
From the two conditions, the cutting condition is coded into a two-digit code,
The coded disconnection information is received from the host computer 35, and automatic disconnection is performed by a disconnection operation program stored in the information processing storage unit 31 for each disconnection pattern.

In the cutting operation program, a cutting control method relating to a cutting start cutting point, a cutting and moving path, a cutting speed, a height of the cutting torch 6, and presence or absence of cutting chips is stored for each cutting pattern. ing.

The starting number of the small plate NO for the small plate (small slab) after cutting is defined by the sampling position, and the plate taking position in response to the cutting instruction is determined.

In the calculation of the cutting position alignment, in determining the cutting width and cutting length, the material dimensions measured by teaching are compared with the cutting instruction dimension range in which the cutting instruction dimension is added with the cutting tolerance. Thus, the width and length of each cutting plate are determined so that the waste loss is minimized.

[0054]

According to the present invention, a gas cutting device for re-cutting a slab can be obtained at low cost, and the cutting efficiency is high.
Cutting of multiple slabs can be performed continuously, and waste disposal is easy.

[Brief description of the drawings]

FIG. 1 is a plan view showing a slab gas cutting apparatus according to an embodiment of the present invention.

FIG. 2 is a front view of the end face detector.

FIG. 3 is a block diagram illustrating a configuration of a cutting position calculation processing device.

FIG. 4 is a plan view showing a state where a cast piece to be cut is placed.

FIG. 5 is an explanatory view showing a cutting pattern of a slab.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 traveling rail 2 traveling device 3 traveling carriage 4 traversing rail 5 torch carriage 6 cutting torch 7 waste cutting torch 8 gas cutting machine 9 teaching camera carriage 10 teaching camera 11 end face detection Device 12 Teaching monitor 13 Operation key 14 Cutting position calculation processing device 15 Drive control device 16 Skew rail 17 Support member 18 Elevating cylinder 19 Frame 20 Optical fiber sensor 21 Spring 22 Detecting rod 23 Spherical axis 24 Rotation detecting body 25 Cast piece 26 Teaching point 31 Information processing storage unit 32 Arithmetic processing unit 33 Gas cutting condition control unit 34 Operation unit 35 Host computer

Claims (4)

[Claims] A slab gas cutting apparatus for re-cutting a slab that has been cut to a predetermined length online after continuous casting to a size required in a rolling process in an off-line manner. A function for recognizing the positions of the four corners of the piece, a cutting instruction from the host computer and the position information of the recognized four corners of the cast piece are used to make a product pick-up plan, and to set the operation route and speed of the cutting torch. A computer for automatically determining cutting conditions including setting, ignition of cutting gas, timing of fire extinguishing and selection of pressure of cutting gas, a gas cutting machine for performing numerical control cutting on the slab, and the gas cutting machine , And an end face detector for detecting that a cutting torch of the gas cutting machine has approached an end face of the slab to be cut by gas cutting. . 2. The method according to claim 1, further comprising a function of dividing the waste generated by recutting the slab into a predetermined size or less by gas cutting during recutting of the slab. Gas cutting equipment for slabs. 3. A gas cutting method for a slab in which a slab that has been cut to a predetermined length online after continuous casting is re-cut off-line to a dimension required in a rolling process. The position of the four corners of the cast slab is recognized by the teaching camera, and a product take-out plan is made based on the cutting instruction from the host computer and the recognized position information of the four corners of the slab, and the cutting torch is operated. The cutting conditions including the setting of the route, the setting of the speed, the ignition of the cutting gas, the timing of extinguishing the fire, the selection of the pressure of the cutting gas, etc. are automatically determined, and the cutting torch is applied to the end face of the slab to be cut into the gas. A method for cutting a slab, wherein numerical control cutting of a plurality of slabs is performed based on the product removal plan and the cutting conditions starting from a time when the slab approaches. 4. The gas cutting of a slab according to claim 3, wherein the waste generated by re-cutting the slab is cut into a predetermined size by gas cutting during the re-cutting of the slab. Method.