JPS61176457A - Continuous casting installation - Google Patents

Abstract

PURPOSE:To eliminate the abnormal deformation of a billet width and the possibility of breakout by controlling the position of support rolls in association with the width change of the walls of a continuous casting mold and the feed speed of an ingot so that the space of the support rolls from the ingot is made always zero. CONSTITUTION:The width change signal by a cylinder 3 for the wall of the continuous casting mold and the feed speed signal of the ingot 12 by a pinch roll driving device 5 are transmitted to a programmable controller 9 which calculates the position of the support rolls 2 upon lapse of time and controls and operate a pressing cylinder 5 thereof. The space of the rolls 2 from the ingot 12 is controlled always zero even if the width of the ingot 12 changes. The abnormal bulging of the ingot and the possibility of the breakout are eliminated.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to continuous casting equipment (particularly, in which the width of the cast steel billet in the support roll is made to follow the width of the cast billet changed during casting. Suitable continuous casting equipment is used to properly control the gap between the mold and the support.

[Background of the invention]

FIG. 4 shows the lengthwise distance of commonly used continuous casting equipment.

As shown in this figure, the continuous casting equipment includes a casting pot 1 and a support roll 2 provided below the casting pot. The support roll 2 is set to match the width of the long piece of the cast steel piece 12 coming out from the lower end of the mold 1, and the gap between the cast steel piece 12 in the support roll 2 and the support roll 2 is zero. Conditions are ideal. If a gap occurs between the cast steel billet 12 and the support roll 2, a bulge phenomenon will occur on the narrow side of the cast steel billet 12, and conversely, if the width of the support roll 2 is set narrow, the narrow side of the cast steel billet 12 will bulge. In either case, crushing the product will not only result in an oddly shaped product, but will also cause breakouts.
Unfavorable for casting.

Normally, during casting, the width of the lower end of the mold 1 and the width of the support roll 2 are matched, and the cast billet 12 and the support roll 2 are matched.
It is easy to keep the gap to zero.

However, when changing the long piece width of the cast steel billet 12 to a particularly narrow width during casting, the gap between the cast steel billet 12 in the support roll 2 and the support roll 2 cannot be controlled to zero with the conventional technology. Ta.

The reason for this is that in the conventional technology, the width change is completed with the casting dust 1, and the support roll 2 is only moved in the narrow width direction when the cast steel billet 12 passes through the support roll 2 and reaches the changed width. This is because the width of the support roll 2 could not be made to follow the narrowing of the cast billet during the width change.

[Purpose of the invention]

An object of the present invention is to solve the problems of the prior art described above, and when the width of the cast steel billet is changed during casting, the width of the support roll is made to follow the width of the cast steel billet, and the gap between the cast steel billet in the support roll and the support roll is reduced. The purpose of the present invention is to provide continuous casting equipment that can be properly controlled.

[Summary of the invention]

The present invention is characterized by the provision of a support roll control device that appropriately controls the gap between the cast steel billet in the support roll and the support roll by making the support roll width follow the width of the cast steel billet that is changed during casting. With this configuration, the above objective can be achieved reliably.

[Embodiments of the invention]

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

FIG. 1 is a cross-sectional view in the longitudinal direction of a cast steel billet in an embodiment of the present invention when the width of the cast billet is narrowed during casting, and FIG. 2 is a block diagram of a support roll control device. Yes, and FIG. 3 is a flowchart.

The continuous casting equipment shown in FIG. 1 includes a mold 1, a support roll 2 following the mold 1, and a pinch roll (not shown) for feeding a cast steel billet 12.

A mold drive device 3, a support roll drive device 4, and a winch roll drive device 5 are directly connected to the mold 1, the support roll 2, and the winch roll.

As shown in FIG.
A second and an eighth pulse generator 6.7.8 are connected.

The first, second and #I3 pulse generators 6.7.8 are:
It is connected to a programmable controller 9 that has a counter function and an arithmetic function.

A second pulse generator 7 connected to the support roll drive device 4 includes an F/V (frequency/11.pressure) converter 1.
0 is connected to feed back the speed of the support roll drive 4 through the pulse generator 7 and the F/V converter 10 of the output 2.

An amplifier 11 is connected to the programmable controller 9, and the output of the programmable controller 9 is amplified by the amplifier 11 and sent to the support roll driving device 4.

In this embodiment, the support roll drive device 4
And, the first, the second. A third pulse generator 6°7.8, a programmable controller 9, an F/V converter 10,
Together with the amplifier 11, a support roll control device is constructed.

In addition, in FIG. 1, 12 indicates a cast steel billet, and 13 indicates an end face of the cast steel billet whose width is being changed.

In the continuous casting equipment of the embodiment, the support roll control device operates as follows.

That is, the first pulse generator 6 connected to the mold driving device 8 outputs the force NAND of the movement amount of the lower end point A of the mold 1 to the programmable controller 9, which is connected to the support roll driving device 4. The second pulse generator 7 counts the amount of movement of the lower #IB point of the support roll 2 and outputs it to the same programmable controller 9. The amount of movement of the cast billet 12, which is the casting speed, is counted and output to the programmable controller 9.

The amount of movement of the cast billet 12 by the eighth pulse generator 8 is always output to the programmable controller 29, but when the casting Wl starts moving, that is, the pulse count from the first pulse generator 6 starts. At the same time, the programmable controller 9 starts counting pulses from the eighth pulse generator 8.

Here, the lower end point A of the mold 1 and the lower end B of the support roll 2
The distance between the points is L, this distance is divided into n equal parts, and the third pulse generator 8 counts the distance corresponding to 1/nXL, and the mold l counted by the first pulse generator 6. The amount of movement of the lower end point A is stored and held in the programmable controller 9. Then, the amount of movement of the lower end point A of the mold 1 when the eighth pulse generator 8 counts the first distance of 1/nxLK@M is stored as β1, and the distance corresponding to the next 1/nX L is stored as β1. The amount of movement of the lower end point A of the mold 1 when counted is stored as β.

Thereafter, apply pressure in the same manner to memorize the movement amount β8,... of the lower end point A of the mold 1 every 1/nXL, and the movement amount at that time is added to the value of the previous movement amount. This is done until n/nXL is reached.

As a result, β1 to β1 are stored in the programmable controller 9.
Up to βn, n pieces of data are stored and retained.

, when the pulse count regarding the amount of movement of the lower end point A of the mold 1 for each 1/nXL reaches n/nXL=PK, that is, when the width change of the mold l is started, the cast steel billet 12 at the lower end point A is A gap starts to appear between the cast billet 12 and the support roll 2 from the time the support roll 2 reaches the lower end point B, so when the casting progresses by 1/nXL from this point, the width control of the support roll 2 is started. Start.

If the movement amount of the width control of the support roll 2 is α, then
First, in order to set α=β1, the programmable controller 9 outputs the movement amount β1, and the output is amplified by the amplifier 11 and sent to the support roll drive device 4. Then, the second pulse generator 7 outputs the actual movement amount of the support roll 2 to the programmable controller 9,
Move support roll 2 until β, -α=OK. Meanwhile, from the second pulse generator 7 to the F/V converter 10
The speed of the support roll drive device 4 is fed back through the controller 9, and the footfall output from the programmable controller 9 is corrected to perform constant speed control.

At the stage where β1-α=OK, the output from the programmable controller 9 becomes zero and the support roll 2
movement stops.

Then, each time the casting progresses by 1/n It is updated sequentially to β, and each time β−
It is controlled to follow the width of the cast steel billet 12 in the support roll 2 so that α=OIC.

Thereby, the gap between the cast steel piece 12 in the support roll 2 and the support roll 2 can be minimized, that is, adjusted to an optimal state.

Here, the reason why the support roll 2 is intermittently controlled every 1/n
m/min K, the speed of support roll 2 is 50~
This is because synchronized operation is not possible at approximately 100 m/min.

The above sequential operations are shown in FIG. 3 as a flowchart of the programmable controller 9.

According to the support roll control device of this embodiment, the width of the cast steel piece 120 in the support roll 2 is calculated as a function of time from the width of the mold l and the casting speed.
When the cast steel width is changed during casting, it is possible to optimally control the gap between the cast steel billet 12 in the support roll 2 and the support roll 2.

〔Effect of the invention〕

According to the present invention described above, there is provided a support roll control device that causes the width of the support roll to follow the width of the cast steel billet changed during casting, and appropriately controls the gap between the cast billet in the support roll and the support roll. As a result, when the width of the cast billet is changed during casting, the gap between the cast billet in the support roll and the support roll can be appropriately controlled, thereby preventing bulges and breakouts on the narrow side of the cast billet. It has the effect of preventing

[Brief explanation of drawings]

Figures 1 to 8 show an embodiment of the present invention, in which Figure 1 shows changes in the cast billet when the width of the cast billet is narrowed during casting, and Figure 2 shows the changes in the cast billet when the width is narrowed during casting. A block diagram of the support roll control device, FIG. 1 is a flowchart of the same programmable controller, and FIG. 4 shows an outline of commonly used continuous casting equipment. FIG. DESCRIPTION OF SYMBOLS 1... Mold, 2... Support roll, 8... Mold drive lid, 4... Support roll drive device, 5...
Vinci roll drive device, 6... first pulse generator for mold movement amount, ? . . . a second pulse generator for the travel amount of the support roll, 8 . . . an eighth pulse generator for the casting speed, 9 . . . programmable controller, 11 . No. 5 b No. 2 31

Claims (1)

[Claims] 1. In continuous casting equipment having a mold and a support roll following the mold, the width of the support roll is made to follow the width of the cast steel billet that is changed during casting, and the width of the cast steel billet in the support roll is Continuous casting equipment characterized by being equipped with a support roll control device that appropriately controls the gap between support rolls. 2. In claim 1, the support roll control device is configured to calculate the width of the cast steel billet in the support roll from the mold width and casting speed, and make the support roll width follow this. Continuous casting equipment featuring: