JP4734162B2 - Billet cutting method - Google Patents

Description

The present invention provides a compact steel piece to be cut when a cast piece or a steel piece cast at a steelmaking factory or a steel plate (hereinafter referred to as a steel piece) is cut into a predetermined size. The present invention relates to a cutting method for cutting steel slabs in a short period of time and for assigning an identification number to each of the cut steel slabs.

For example, when transferring steel slabs from a steelmaking factory to a steel sheet manufacturing factory, in order to reduce the handling load, the steelmaking factory requires 2 to 4 times the length of the steel slab required at the steel sheet factory (approximately 2 to 5 m). A method of cutting by length (hereinafter referred to as primary cutting), transferring to a steel sheet factory in that state, and cutting to a predetermined length (hereinafter referred to as secondary cutting) at the steel sheet factory is employed.
As a cutting device, for example, a method of cutting or marking by moving a cutting machine and a marking device in synchronization with the transfer of a steel piece while transferring the steel piece as in Patent Document 1 has been proposed. However, this assumes primary cutting in which the transfer of the steel slab cannot be stopped in terms of speed matching with continuous casting, and the equipment becomes large.

In addition, as the secondary cutting, the steel slab has been cut to a length of about 10 m by the primary cutting. Therefore, the steel slab is generally cut after being cut by a cutting machine with the steel slab stopped. There is a method of transferring the mark to another place and marking.
Here, as a secondary cutting method, a single piece of steel is simultaneously cut with a plurality of cutting machines, and then conveyed to a marking device for marking, and a single cutting machine sequentially cuts a plurality of points. After carrying out, there is a method of transferring and marking each steel piece. The former has a problem that the total cutting time of the steel slab is shortened, but the equipment is large and the equipment cost is increased. On the other hand, the latter has a problem that the equipment is compact, but cutting and marking can be performed only one by one and a long time is required for the operation.
Japanese Patent Laid-Open No. Sho 61-140360

The present invention provides a method of cutting a steel slab that enables the work from cutting to marking of a steel slab to be performed with a compact facility and with a small transfer load and a short work time.

The gist of the present invention is as follows.
( 1 ) In a steel piece cutting facility, a steel piece support frame on which a steel piece to be cut is placed, a rail disposed across the support frame, and a cut for cutting a steel piece that can travel on the rail An apparatus and a marking device for assigning an identification number to a cut steel piece that can run on the same rail are arranged, and the cutting device and the marking device are located at their respective positions or distances from each other. When cutting and marking a steel slab using a cutting equipment that has a control device capable of recognizing the steel and the control device is connected to a host computer , the cutting device starts cutting the steel slab. A method of cutting a steel slab characterized in that the time (Δt) until the start of marking of the marking device is determined by the following equation.
Δt = {N × t _C + (L ₀ + L _C ) / V _C } − {N × t _M + L _M / V _M }
However,
Δt: Time from the start of movement of the cutting device to the start of movement of the marking device N: Number of cutting points (= number of marking points-1)
t _C : Time required for cutting per location t _M : Time required for marking per location V _C : Moving speed of the cutting device V _M : Moving speed of the marking device L ₀ : Interval for preventing collision between the cutting device and the marking device L _C : Distance from cutting device movement start position to final marking position L _M : Distance from marking device movement start position to final marking position

According to the cutting method of the present invention, the cutting work of the steel slab can be performed in a short time with a compact equipment, so that the equipment cost can be reduced and the work time can be shortened, so that the productivity is improved. There is an effect.

FIG. 1 is a diagram showing an embodiment of a cutting facility used in the present invention. Moreover, FIG. 2 is a figure which shows an example which showed the cutting position and marking position of a steel piece.
A steel piece 2 to be cut is placed on a steel piece support frame 1, and rails 3 are provided on both sides thereof. A cutting device 4 capable of traveling on the rail 3 is arranged, and a marking device 6 is arranged on the opposite side across the steel piece 2. The marking device 6 can also travel on the same rail 3 as the cutting device 4.
The cutting device 4 and the marking device 6 have control devices such as a cutting device control computer 5 and a marking device control computer 7, respectively. These control devices can recognize at least the position of each other device, or It has a function to recognize the distance.
Recognizing each other's position, each standby position is stored, the travel distance is counted by, for example, a pulse generator, the position of the own device is recognized, and the position information is notified to each other via the communication line 8 or the like. This is possible. Alternatively, a laser range finder or the like that measures the distance between each device or both devices may be mounted, and the information may be shared. Further, each control device is connected to the host computer 9, and can receive the billet information before cutting or transmit the record information after cutting.

Next, the movement of each apparatus will be described with reference to FIG.
First, a steel piece to be cut is loaded on a support frame by a cargo handling facility such as a crane. Thereafter (or in advance), information such as the cutting length related to the steel piece to be cut is transmitted from the host computer 9 to the cutting device control computer 5. (Figure 3-1)
Next, an instruction for measuring the length of the steel piece to be cut is transmitted from the cutting machine control computer 5 to the cutting apparatus 4. For example, the cutting device moves on the steel piece by a steel piece end detector and a pulse generator attached to the cutting machine. While measuring the length of the slab.
At this time, the cutting device moves toward the marking device, but the cutting device 4 and the marking device 6 always know the position of each other or the distance between the two through the communication line so that the two do not collide, Sharing. (Fig. 3-2)
After completing the length measurement of the steel slab, the cutting device transmits the length measurement result of the steel slab to the host computer 9 by the cutting device control computer 5. (Figure 3-3)

After the measurement of the length of the steel slab is completed, a cutting instruction is transmitted from the cutting device control computer 5 to the cutting device 4, and the cutting device starts cutting. At this time, by the cutting device control computer 5 or the marking device control computer 7, the cutting device movement obtained by the following formula by the moving speed of each device, the number of cutting locations, the number of marking locations, the time required for cutting, the time required for marking, etc. A time difference Δt from the start to the start of the marking device movement is obtained. (Fig. 3-4)
Δt = {N × t _C + (L ₀ + L _C ) / V _C } − {N × t _M + L _M / V _M }
However,
Δt: Time from the start of movement of the cutting device to the start of movement of the marking device N: Number of cutting points (= number of marking points-1)
t _C : Time required for cutting per location t _M : Time required for marking per location V _C : Moving speed of the cutting device V _M : Moving speed of the marking device L ₀ : Interval for preventing collision between the cutting device and the marking device L _C : Distance from the cutting device movement start position to the final marking position L _M : Distance from the marking device movement start position to the final marking position After the cutting of the first steel piece is completed, the cutting device control computer 5 transfers to the host computer 9 The cutting result is transmitted, and the next cutting instruction is transmitted from the host computer 9 to the cutting device 4, and the cutting device starts the next cutting. After receiving the first cutting result from the cutting device, the host computer transmits the marking information of the first cut steel piece to the marking device control computer 7. (Figure 3-5)

The marking device control computer 7 transmits a marking instruction to the marking device 6 after the time difference Δt from the start of the movement for cutting, and the marking device starts moving.
After the cutting device completes the cutting of the second steel piece, the cutting result is transmitted again from the cutting device control computer 5 to the host computer 9, and the cutting completion information is transmitted if all cutting is completed. The upper computer 9 transmits the second piece marking information to the marking device control computer 7 after receiving the cutting result of the second piece. Further, when the cutting completion information is received, the marking information on the final (third) steel piece is transmitted to the marking device control computer 7. (Fig. 3-6)
Each time the marking device 7 completes marking on each steel piece, the marking device control computer 7 transmits the marking completion result to the host computer 9. (Fig. 3-7)
After the marking of the final steel piece is completed, the marking device control computer 7 transmits the marking completion result to the host computer 9, the cutting and marking operations are terminated, and the cutting device and the marking device return to their standby positions. (Figure 3-8)

Next, the movement of the cutting device and the marking device and Δt will be described with reference to FIG. In FIG. 4, the horizontal axis represents the position of the steel slab, and the vertical axis represents the elapsed time from the bottom to the top.
In this example, the case where the steel pieces to be cut are made into three steel pieces by cutting at two places, and a case where marking is made at a total of three places is described as an example.
The solid line in the figure indicates the movement of the cutting device, and the dotted line indicates the movement of the marking device. First, the cutting device (solid line) starts from the standby position and moves to the right end of the steel slab to measure the length of the steel slab before cutting (from left to right in FIG. 4). After that, it moves in the reverse direction (right to left in the figure), cuts at the first cutting position 1, and further moves to the cutting position 2 after completion to perform the second cutting. Then, it moves to the standby position of the cutting device and returns to finish the operation.

On the other hand, the marking device (dotted line) starts the standby position after Δt after the cutting device starts moving for cutting from the right end of the steel piece in the drawing. This Δt is a grace time for which the marking device does not collide with the preceding cutting device until the last marking operation is completed. Specifically, it is obtained by the following formula.
Δt = {N × t _C + (L ₀ + L _C ) / V _C } − {N × t _M + L _M / V _M }
However,
Δt: Time from the start of movement of the cutting device to the start of movement of the marking device N: Number of cutting points (= number of marking points-1)
t _C : Time required for cutting per location t _M : Time required for marking per location V _C : Moving speed of the cutting device V _M : Moving speed of the marking device L ₀ : Interval for preventing collision between the cutting device and the marking device L _C : distance from the cutting device movement start position to the final marking position L _M : distance from the marking device movement start position to the final marking position The marking devices started after Δt are sequentially in the marking position 1, the marking position 2, and the marking position 3. Marking is performed, and when the last marking is completed, the process returns to the standby position.
Usually, the cutting work preceding the marking work is slower than the marking work, and the most efficient mutual work start timing is determined by this setting of Δt.

The conventional method and the method of the present invention are used to divide the slab of length 12m, width 2m and thickness 240mm into 4m slabs, and to mark each of the upper and side surfaces of the slab after cutting. Then, the required time was compared. The results are shown in Table 1. Compared with the conventional method, it was confirmed that the method of the present invention can dramatically reduce the working time, and the equipment is compact and the equipment cost is low.

The figure which shows one Example of the cutting equipment used by this invention method . The figure which shows an example which showed the cutting position and marking position of a steel piece. The 1st step figure which shows a motion of a cutting device and a marking device. The 2nd step figure of a motion of the cutting device and marking device following a 1st step. The 3rd step figure of a motion of the cutting device and marking device following a 2nd step. The 4th step figure of a motion of the cutting device and marking device following a 3rd step. The 5th step figure of a motion of the cutting device and marking device following the 4th step. The 6th step figure of a motion of the cutting device and marking device following a 5th step. The 7th step figure of a motion of the cutting device and marking device following a 6th step. The figure which shows the state which returned to the 1st stage again from the 7th stage. The figure which shows the time-dependent movement of a cutting device and a marking device.

Explanation of symbols

1: Steel piece cutting support frame 2: Steel piece 3: Rail 4: Cutting device 5: Cutting device control computer 6: Marking device 7: Marking device control computer 8: Communication line 9: Host computer

Claims (1)

In a steel piece cutting facility, a steel piece support frame for placing a steel piece to be cut, a rail disposed across the support frame, and a cutting device for cutting the steel piece that can travel on the rail, A marking device for assigning an identification number to a cut steel piece that can run on the same rail is arranged, and the cutting device and the marking device can recognize each position or distance from each other. When cutting and marking a steel slab using a cutting facility connected to a host computer, the control device is configured to perform the marking after the cutting device starts cutting the steel slab. A method of cutting a steel slab characterized in that the time (Δt) until the start of marking of the apparatus is determined by the following equation.
Δt = {N × t _C + (L ₀ + L _C ) / V _C } − {N × t _M + L _M / V _M }
However,
Δt: Time from the start of movement of the cutting device to the start of movement of the marking device N: Number of cutting points (= number of marking points-1)
t _C : Time required for cutting per location t _M : Time required for marking per location V _C : Moving speed of the cutting device V _M : Moving speed of the marking device L ₀ : Interval for preventing collision between the cutting device and the marking device L _C : Distance from cutting device movement start position to final marking position L _M : Distance from marking device movement start position to final marking position

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