JPS62187518A - Cutting method for edge of hot rolling wire - Google Patents

Abstract

PURPOSE:To securely control a cutting position and to minimize an error of a cut length on a wire production line, by providing a cutting apparatus between a branching device for selecting a coil winding machine and the winding machine, reducing a winding speed of the wire to cut the end of the wire. CONSTITUTION:A blank material for the wire is heated to a prescribed temperature in a heating furnace 1 to roll in a prescribed shape and dimension by a wire rolling mill 2, then the passing of the end of the wire is detected by the branching device 3. Backward the branching device 3, the line is branched into two series having the same a coil winding machine 5 positioning a pinch roll 6 is disposed on each system, and the cutting apparatus 4 to cut the wire end is provided between the branching device 3 and the coil winding machine 5. Then, by a control circuit shown in the figure, the signal detected by the hot steel detector 7 to show the passing of the wire end is transmitted to electric motors 5a, 6a as a signal of reducing speed to reduce the speeds of the coil winding machine 5 and the roll 6 with alignment. Simultaneously, the change of the number of the electric motor 6a is transmitted to a pulse computing element 8, the speed and position of the wire end are calculated to transmit to the electric motor 4a to operate it to cut the wire end in predetermined length.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for cutting the ends of a hot-rolled wire when the wire is wound into a ring.

Conventional technology In many cases, it is not possible to sufficiently remove flaws from the ends of billets used as raw materials for hot-rolled wire rods, and flaws remain at the ends of the wire rods even after rolling. It also deforms and causes layer flaws at the ends of the wire. The end portion of the wire is cut in order to remove a defective portion that occurs at the end portion of the wire, and to confirm the removal of the defective portion and to take a sample for inspecting the size and shape.

Fig. 2 is an explanatory diagram showing the configuration of an example of a conventional device for cutting the ends of wire rods, in which a flying shear is installed as a cutting device (4) immediately after the wire rolling equipment (2), and the rolling speed is After cutting the ends of the wire in synchronization, the wire is guided to one of the two winding machines (to), (2) through a winding machine selection turnout (3) (hereinafter simply referred to as turnout (3)). , wind up into a ring shape. The same process is repeated using the winding machine (2) and (5) alternately.

Problems to be Solved by the Invention However, in the above-mentioned conventional method, the wire rod is cut while moving at high speed, so there is a problem that the cutting position varies and the error in the cutting length is large. For example, when cutting a wire rod with a diameter of 13 mm at the tail end position of 300 mm, the normal rolling speed is about 18 m/see, so if there is an error of 0.1 seconds in the operation of the flying shear, the cutting position will be 1.0 mm.
There was an error of 8m, and either the cut was missed and the cut was not made, or the cut was made at the tail ##2.1m position. If tail end 3
If you try to cut at a position within the error range of ±1001 for 00 machining, it is extremely difficult as only an operating error of ±0,00 seconds is allowed.

In addition, when cutting and collecting samples for inspection, it is extremely difficult to stop and take out the cut material if the wire rod is moving at high speed.To avoid this, for example, the total length is 18 m.
Even if a trough with two water reservoirs for brakes is installed in the middle of the trough, the stopping position will vary depending on the speed, material, size, etc. of the material to be cut, and scratches may occur while passing through the trough. ,
There was also the problem that it was difficult to distinguish from flaws that occurred during rolling, making it unsuitable as a sample for inspection.

Furthermore, since the cutting must be done instantaneously in a short period of time, a large-sized cutting device is required.

Means for Solving the Problems The purpose of the present invention is to provide means for solving the above-mentioned conventional problems. A cutting device is provided between each of the plurality of winding machines and a branch that guides the rolled wire rod to one of the plurality of winding machines, and the winding speed of the wire rod is lower than the speed during rolling. The present invention relates to a method for cutting an end of a hot rolled wire rod.

The present invention will be explained below based on the drawings.

FIG. 1 is an explanatory diagram showing the configuration and control circuit of an example of a device for carrying out the present invention. In the same figure, a heating furnace 0) that heats the wire material to a predetermined temperature is followed by a wire rolling equipment (2) that rolls the wire material into a predetermined shape and size. A turnout (3) is provided containing a hot steel detector (7) for detecting the passage of. The rear part of the turnout (3) is divided into two lines with the same configuration (only one line is shown), and each line is equipped with a winding machine with a pinch roll (6) in front. A cutting device (4) for cutting the end of the wire is provided between the branch (3) and the winding machine (2). The cutting device (4), pinch roll (6), winding machine, etc.) are each powered by an electric motor (4).
a), ((3a) and (5a), and an electric motor (f?
a) and (5a) are connected to the hot steel detector (7), and the electric motor (6a) and the electric motor (4a) are further connected to a pulse calculator (8) that calculates the speed and position of the tail end of the wire. A control circuit is constructed using the following.

As the cutting device (4), a flying shear that can cut the wire without stopping the production line is generally used.

As for the winding machine (2), a polling type winding machine is usually used when winding a wire rod with a diameter of 13 mm or more. Further, the number of installed units is not limited to two, and three or more units may be installed as necessary.

Operation To carry out the present invention using an apparatus having the above configuration,
After the tail end of the wire rod rolled in the wire rod rolling equipment (2) of FIG. 1 passes through the branching device (3), the wire winding speed is gradually decreased from the speed during rolling, and then The end of the wire rod may be cut to a predetermined length by activating the cutting device (4) installed between the winding machine and the winding machine. That is,
In the control circuit shown by the thin solid line in the same figure, the signal indicating the passing of the end of the wire detected by the hot steel detector (2) is used as a deceleration start signal to the electric motor 41 of the winding machine 0 and the pinch roll (6). ! (5a) and (6a), and deceleration is performed by synchronizing the winding machines (winding machines) and the pinch rolls (6). At the same time, the electric motor of the pinch roll (6) (
6a) is transmitted to the pulse calculator (8), the speed and position of the tail end of the wire are calculated, and the cutting device (8) calculates the speed and position of the tail end of the wire.
This signal is transmitted to the electric motor (4a) (to), which is activated to cut the end of the wire at a predetermined length.

For example, when the rolling speed is 18 m/sec and the capacity of the motor of the winding machine is 500 kW, the deceleration time due to the maximum deceleration torque that the motor can produce is about 6 seconds, and the distance from the turnout to the winding machine is 50 m. If so, the speed when the tail end of the wire reaches the entrance of the winding machine will be close to zero, making it possible to cut with almost no error in cutting length.

Furthermore, if the distance from the turnout to the winding machine must be 50 m or more, the cutting speed should be set to about 1.8 m/sec. In this case, the process time can be shortened by increasing the winding speed again after cutting is completed.

It is desirable that the cutting device (4) be placed as close to the winding I Fm (5) as possible, so that the tail end of the wire moves at a slower speed during cutting, making it easier to control the cutting position.

Example The following will explain based on examples.

In a hot-rolled wire manufacturing line, a comparison was made between the required power of 117 cutting machines when the wire end cutting method of the present invention was applied and when the conventional method was used. The outer diameter of the wire rod after rolling is 13mm, and the rolling speed is 18m/5ec.
1. A flying shear was used as the cutting device. Table 1 shows the GD' of the electric motor, reducer, and flying shear body, the GD' converted to the motor shaft, and the total GD' that is the sum of these, the specifications of the flying shear, and the electric motor acceleration torque required for calculation. The various numerical values are shown together.

In the same table, the diameter and acceleration angle of the cutting blade (hereinafter referred to as knife) attached to the rotating part of the flying shear are the same between the method of the present invention and the conventional method, but the cutting speed is 18 m/min of the rolling speed in the conventional method. 20m/ with 10% surplus capacity in sec.
2 m in accordance with the speed when the tail end of the wire approaches the entrance of the winding machine.
/sec. As a result, the rotational speed and acceleration time after acceleration of the knife shaft that constitutes the rotating part of the flying shear are as shown in the table, and the reduction ratio of the electric motor is I/10 in the case of the present method and I/10 in the case of the conventional method. 172, the rotational speed of the electric motor after completion of acceleration becomes the value shown in the table. In addition, GD" converted to the motor shaft of the reducer and the flying shaft body is the G of the reducer and the flying shaft body.
Since it is obtained by multiplying D' by the square of the reduction ratio, it becomes the value shown in the same table, and the total GD' is 11.3 kg・ze in the case of the present method and 11.3 kg・ze in the case of the conventional method, including the GD of the electric motor. 65
kg@♂.

Table 2 shows the required acceleration torque converted to the motor shaft (hereinafter referred to as the acceleration torque of the electric motor), the required cutting torque converted to the motor shaft (hereinafter referred to as the cutting torque of the electric motor), and the required power of the electric motor. In the same table, the acceleration torque of the electric motor is determined by the following equation (1).

However, T2 Acceleration torque of electric motor (kg-m) N:
Rotation speed of electric motor (rpm) Δt: Acceleration time of knife shaft (see) GD”:
Total GD' (bg-♂) converted to the motor shaft, that is, in the case of the method of the present invention in equation (1), N = 382, G
By substituting D" = 11.3, Δt = 2.38, and N = 748, GD' = 65, Δt = 0.236 in the conventional method, the acceleration torque of the electric motor is 4.9 kg s 560 kg in the conventional method
−m. Also, the cutting torque of the knife shaft is 100 k
g-m, but the cutting torque converted to the motor shaft is multiplied by the reduction ratio shown in Table 1 and is calculated as 1 in the method of the present invention.
0 kg"m N In the conventional method, it becomes 50 kg-m.

The capacity of the electric motor is determined by the larger of the accelerating torque of the electric motor and the cutting torque of the electric motor, so the required torque of the electric motor is 10 kg-m in the case of the present method and 560 kg-m in the case of the conventional method. .

The required power of the electric motor is determined from the above-mentioned required torque of the electric motor using the following equation (2).

However, P: Required power of the electric motor (kW) No.: Base rotation speed of the electric motor (rpm) T: Required torque of the electric motor (kg I m) In other words, in equation (2), the base rotation speed of the electric motor is By substituting T=10 in the case of the method of the present invention and Tm2O3 in the case of the conventional method, the required power of the electric motor is 1 in the method of the present invention.
0kW.

In the conventional method, the power is 480kW.

From the results in Table 2 above, it can be seen that by applying the method of the present invention, the acceleration torque and cutting torque of the electric motor are reduced, and the required power of the electric motor is reduced to one tenth or less.

(The following is a blank space) As described in detail of the invention, in a hot-rolled wire production line, a cutting position H is provided between a branch for selecting a winding machine and the winding machine, and the winding speed of the wire is controlled by rolling. By applying the method of the present invention in which the end of the wire is cut at a speed lower than the medium speed, the cutting position can be reliably controlled and errors in the cutting length can be minimized. Furthermore, when cutting and collecting a sample for inspection, the wire is cut after the wire moves at a low speed, so the material to be cut is easily stopped and no scratches occur. Furthermore, the required power of the electric motor for cutting at g position can be reduced to less than a few tenths of the conventional power, and the cutting HWI can be downsized, which is extremely useful in industry.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing the configuration and control circuit of an example of all for carrying out the present invention, and FIG. 2 is an explanatory diagram showing the configuration of an example of a conventional device for cutting the ends of wire rods. . 1... Heating furnace 2... Wire rod rolling equipment 3...
Turnout number... Cutting device 4a... Electric motor
5... Winding machine 5a... Electric motor 6...
Pinch roll 6a...Electric motor 7...Heat steel detector...Pulse calculator

Claims (1)

[Claims] In a hot rolled wire production line having a plurality of winding machines, a winding machine selection branch that guides the rolled wire to one of the plurality of winding machines and the plurality of winding machines are provided. A method for cutting an end of a hot rolled wire rod, in which a cutting device is provided between the wire rods, and the winding speed of the wire rod is lower than the speed during rolling to cut the end of the wire rod.