JPS602147B2 - Ingot drawing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ingot drawing device for intermittently drawing coin coins horizontally from a mold of a horizontal continuous casting machine. By using this method, it is possible to achieve high-level, high-precision control.

In a horizontal continuous metal casting machine, the mirror ingot is held between a drive roll and a presser roll, and is intermittently pulled out horizontally from the mold. It depends on the withdrawal speed, withdrawal stroke, and other factors such as reverse movement to prevent sticking in the mold.
It is known that in order to obtain a healthy coin coin, it is necessary to increase the accuracy of the time and stroke, and to perform the withdrawal stop cycle frequently, that is, to increase the number of strokes within a unit time as much as possible.

It is also known that the instantaneous rise in speed at the time of withdrawal causes cracks in the ingot within the mold, so it is necessary to continuously increase the acceleration from zero. Conventionally, the drive device for the mold pull-out roll is turned on and off using an ordinary DC motor, or is turned on and off via an electromagnetic clutch.

However, mirror blocks manufactured in recent years have shown a tendency to become larger, and along with this, the drive system and the entire device are becoming larger and have a larger capacity. It is technically difficult to control such large-sized, large-capacity devices with high frequency and high precision. For example, when pulling out a large key block of hundreds of kilograms per unit length, the maximum frequency is usually about several tens of times per minute, and the stroke accuracy also has an error of several millimeters per stroke, resulting in acceleration. control becomes even more difficult. Such problems are due to increased inertia due to the increased size of the device. In response to this, methods have been developed in which a hydraulically operated motor is started and stopped by opening and closing a solenoid valve or cam valve, and a method that combines a hydraulically operated cylinder with a rack and pinion.
However, as the piping system becomes more complex and its length becomes longer, the responsiveness deteriorates and position accuracy during high-frequency operation decreases.

In addition, it is difficult to control acceleration with the drive method using a hydraulic source.
It is difficult to freely adjust the range. Other drive methods using electro-hydraulic stepping motors have been developed, which enable relatively high-frequency and high-precision control, but they do not have a large capacity and cannot be used to increase the size of the device. In addition, because the equipment is complex, it has a relatively high failure rate and many maintenance problems. In view of this, the present invention has been developed as a result of various studies, and it has been found that the draw-out and stop cycles can be operated at a high frequency of 150 times/minute or more, and the draw-out and stop cycles can be performed at a high frequency of 150 times/minute or more.

We have developed a rust lump drawing device that can control the accuracy of the metal down to 0.1 thickness, and also allows easy control of acceleration.The coin lump is pulled out from the mold of a horizontal continuous casting machine by being held between the driving roll and the presser roll. A programmer full controller that uses a hollow roll as a drive roll in a device that intermittently pulls out horizontally, drives this with a low-inertia DC servo motor, programs a sequence circuit in the motor, and issues pulse commands according to operating conditions; It is characterized by being equipped with a control circuit with a closed loop that feeds back position and speed, consisting of a digital control device that converts a pulse command into an analog voltage, and an analog control device that controls the rotation of the servo motor using the analog voltage. It is. This will be explained in detail using the drawings.

Figure 1 shows an example of the drawing device of the present invention, in which 1 is a molten metal holding furnace, 2 is a mold, 3 is a mold cooling device, 4 is a coin coin, 5.5' is a lo-fu conveyor, and 6 is a drawing device. The molten metal in the holding furnace 1 is sequentially solidified in the mold 2 attached to the side wall of the holding furnace 1 by the mold 2 and the cooling device 3 installed on the outer periphery of the mold 2, and is turned into coins 4 and transferred to a low-fu conveyor. 5,5
’ pulled up.

A pull-out device 6 is provided between the lo-fu conveyors 5.5', and the mirror blocks 4 are intermittently drawn out on the lo-fu conveyors 5.5' in the direction of the arrow shown in the figure. Drawer device 6
consists of a hollow drive roll 7 and a presser roll 8 that presses the mirror block 4 onto the drive roll 7, and the presser roll 8 is pressed under zero spring pressure, screw pressure, or as shown in the figure by a cylinder 9, and presses the mirror block 4 onto the drive roll 7. 4 is held between a drive roll 7 and the coin coin 4 is pulled out by rotation of the drive roll 7. The drive roll 7 is connected to a low-inertia DC servo motor 11 by a tack ring 12 through a speed reducer 10, and if a plurality of drive rolls 7, 7' are used as shown in the figure, a distribution gear 13 may be used. The low-inertia DC servo motor 11 is equipped with a control circuit 14 using a microcomputer, and has a zero-draw and stop cycle of 150.
Stroke accuracy can be improved to 0.1 with high frequency operation of more than 1 stroke per minute.
The control circuit 14 can control even the skin, and can freely change the acceleration.The control circuit 14 programs the necessary sequence circuits and sets the operating conditions, such as speed, start stroke, etc. A position consisting of a programmable controller 15 that issues pulse commands in accordance with this, a digital control device 16 that converts the pulse commands into analog voltage, and an analog control device 17 that controls the rotation of the low-inertia DC servo motor 11 using the analog voltage. and a closed loop that feeds back the speed.

Commands from the programmer full controller 15 to the digital control device 16 are sent as a pulse train, and the frequency of the pulses commands the rotational speed of the motor 11, and the number of pulses commands the rotation angle. Then, it is converted into a DC analog voltage by the digital control device 16, and the analog control device 17 is used to control the motor 11. At the same time, the speed control is fed back to the analog control device 17 by the tacho generator 18, and the position control is controlled by the pulse generator 19. It is fed back to the digital controller 16. In this way, the rotation of the servo motor 11 is operated with high accuracy and high cycle until the pulse pool reaches zero according to the deviation counter in the digital control device 16. Examples of the apparatus of the present invention will be described below.

As shown in Fig. 1, a graphite mold and a cooling device for the mold were attached to the side wall of the holding furnace, and horizontal continuous casting of knots was performed. The coin coins, which had solidified in the mold and had a thickness of 20 Yanagi and a medium size of 50 Yanagi, were guided onto a roller conveyor, pulled out by the pulling device of the present invention, and sent onto a rear Rofu conveyor. In the device of the present invention, a hollow roll whose interior is water-cooled is connected to a low-inertia DC servo motor (Minasha motor manufactured by Yaskawa Electric) through a cyclo reducer, and the pressure roller is pressed down by a hydraulic cylinder.
A coin coin was held between a hollow roll and a pressing roll. The pressing force was determined from the coefficient of friction between the roll and the rust mass and the pulling force, and for safety, the pressing force was added to the pulling force. The low-inertia DC servo motor is equipped with a control circuit using a programmable controller (MemM Hada SC481 manufactured by Yaskawa Electric), a digital control device (PositioMack manufactured by Yaskawa Electric), and an analog control device (Semopack manufactured by Yaskawa Electric) to control the pull-out and stop cycles. was controlled.

Program the necessary Sequence circuit in the programmable controller and set the draw time to 0.1 to 300 cc and the stop time to 0.
5-2 $ec, speed 1-200 side/s, stroke 0.
5-100. The rotation speed was set and sent as a pulse command to the digital control device, where it was converted to a DC analog voltage by a D/A converter, and passed through the analog control device as a speed command to control the rotation of the low-inertia DC servo motor. At the same time, the tacho generator installed on the opposite load side feeds back the speed to the analog control device, the pulse generator feeds back the position to the digital control device, and the deviation counter in the digital control device keeps the motor running until the pulse accumulation reaches zero. rotated. As a result, the servo motor was controlled at high cycles and with high precision, at 160 cycles per minute, with a stroker error of 0.1, and the resulting gun mass was of high quality and free of defects. As described above, according to the present invention, sufficient accuracy is ensured in response to recent increases in size and capacity, and high cycles of more than 150 times per minute are possible, and positional accuracy can be controlled to ±0.1 degrees. Not only is this possible, but the acceleration can also be easily adjusted, which has the remarkable effect of improving quality in horizontal continuous casting.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing an example of the apparatus of the present invention. 1...Holding furnace, 2...Mold, 3...
...cooling device, 4... coin roll, 5, 5'... lo-fu conveyor, 6... drawer device, 7... hollow drive roll, 8... ...presser roll, 11...
...Low inertia DC servo motor, 14...Control circuit, 15...Programmable controller, 1
6... Digital control device, 17... Analog control device, 18... Evening cogenerator, 19... Pulse generator. Figure 1

Claims (1)

[Claims] 1. In a device that intermittently pulls out an ingot from a mold in a horizontal continuous casting machine by holding it between a drive roll and a presser roll in the horizontal direction, a hollow roll is used as the drive roll, and this is driven by a low-inertia DC servo motor. A position controller consisting of a programmable controller that programs a sequence circuit in the motor and issues pulse commands depending on operating conditions, a digital control device that converts the pulse commands to analog voltage, and an analog control device that controls the rotation of the servo motor using analog voltage. An ingot drawing device characterized by being equipped with a control circuit with a closed loop that provides speed feedback.