JP2001150107A - Method of controlling gap between belt and dam block in twin belt type continuous caster - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a control method of a gap between a belt and a dam block in a twin belt type continuous caster, in which the gap between the belt and the dam block is controlled to a suitable amount so as not to generate the burr of a cast block caused by the insertion of molten metal into the gap. SOLUTION: An instrument for detecting the burr at the corner part of the cast block, is arranged at the rear part of the caster constituted with the driven upper and lower belts and the dam blocks at the right and the left sides disposed in parallel so as to interpose with these belts. A signal from this instrument is made to feedback into a control unit in a gap adjusting mechanism of the belts at the upper and the lower parts to adjust the gap between the upper and the lower belts and the right and the left dam blocks. The gap between the upper and the lower belts, is measured with the measuring instrument and can be interlocked so as not to become smaller that the setting gap amount.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a mold comprising upper and lower driving belts and left and right dam blocks installed in parallel so as to be sandwiched between these belts. The present invention relates to a twin-belt caster having a mechanism for continuously producing an ingot by pouring, and particularly to a method for controlling a gap between a belt and a dam block so that burrs do not occur at corners of the ingot.

[0002]

2. Description of the Related Art FIGS. 3 and 4 show the construction of a twin-belt type casting machine, in which steel belts 1 and 2 arranged vertically and sandwiched between these belts 1 and 2 are shown. The left and right dam blocks 3 arranged in parallel constitute a casting mold.

[0003] Steel belts 1 and 2 are driven between a drive pulley 4 and a driven tension pulley 5 for driving. Reference numeral 6 denotes a belt pulling device for pulling the belts 1 and 2 in the longitudinal direction. The driving belts 1 and 2 are installed to be inclined slightly downward to the right as shown in the figure.

[0004] The dam block 3 is composed of a steel trap 10 (Fig. 4) in which a large number of blocks (made of copper or copper alloy) are formed.
Are connected endlessly in a rosary shape, and this is sandwiched between the upper and lower belts 1 and 2, so that the belts 1 and 2
2 is driven. The dam block 3 thus provided is supported and guided inside the belts 1 and 2 by the dam block guide 7 (FIG. 4).

[0005] In continuous casting by a twin belt type casting machine comprising such main parts, a molten metal is poured from a front pouring section (upper left portion in FIG. 3) of a casting machine by a pouring device 8, and The molten metal poured into the mold composed of the belts 1 and 2 and the dam block 3 is cooled and solidified by a cooling spray zone 9 provided outside the belts 1 and 2, and continuously solidified as an ingot 12. Production and discharge. At this time, the dam block that became hot due to contact with the molten metal,
After passing through the cooling device 11, it is cooled and cooled, and is again led to the pouring port in front of the casting machine.

[0006]

In the twin belt casting machine shown in FIG. 3, the dam block 3
During casting, heat is received from the contacting molten metal during casting, and it becomes larger than at the start of casting. FIG.
(B) shows the state, in which the expanded inner corner 13 of the dam block 3 competes with the upper belt 1 to damage the belt 1 and shorten its service life. The belt whose life has expired must be replaced after the casting is stopped, resulting in a decrease in the operating rate in casting.

Therefore, conventionally, as shown in FIG. 4 (a), a predetermined gap Δ is provided in advance between the dam block 3 and the belt 1 in consideration of the thermal expansion allowance of the dam block 3. I have.

However, the appropriate amount of the gap Δ is
It changes depending on the temperature of the molten metal and the temperature of the dam block entering the pouring port. If this gap Δ is too large,
At the start of casting, the molten metal is inserted between the upper belt 1 and the dam block 3 as shown in FIG.
Are generated, which become burrs at the corners of the manufactured ingot and reduce the quality of the ingot. On the other hand, if the gap Δ is too small, as described above, the upper belt 1 and the dam block 3
Compete with each other, and the upper belt 1 is damaged.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a twin belt type continuous belt for controlling a gap between a belt and a dam block to an appropriate amount, thereby preventing burrs of an ingot due to insertion of a molten metal into the gap. It is an object of the present invention to provide a method of controlling a gap between a belt and a dam block of a casting machine.

[0010]

According to the present invention, there is provided a method of controlling a gap between a belt and a dam block of a twin belt type continuous casting machine provided by the present invention. A device that detects burrs at the corners of the ingot is provided behind the casting machine consisting of the left and right dam blocks, and the signal from that device is fed back to the control unit of the upper and lower belt spacing adjustment mechanism. By doing so, the gap between the upper and lower belts and the left and right dam blocks is adjusted.

The distance between the upper and lower belts is measured by a measuring device, and the belt can be interlocked so as not to be less than a set distance.

[0012]

1 and 2 show an embodiment of a gap control method between a belt and a dam block of a twin belt type continuous casting machine according to the present invention. FIG. 1 shows a twin belt type continuous casting machine. FIG. 2 shows a casting machine and a casting situation, and FIG. 2 shows an upper and lower belt gap adjusting mechanism and ancillary equipment in the casting machine. Since the same functional portions as those of the twin belt type continuous casting machine of FIG.
See also the above description of

In this embodiment, an interval adjusting mechanism is provided for the upper and lower belts 1 and 2. As shown in FIG. 2, this mechanism includes a lower carriage 15 integrated with a support (main body) frame 16 and an upper carriage 17 connected to the support (main body) frame 16 by movable links 18a and 18b. The lower carriage 15 supports the lower belt, and the upper carriage 17 supports the upper belt. In addition, an elevating cylinder 19 is connected and installed between the upper carriage 17 and the support (main body) frame 16, and the upper carriage 17 moves up and down, whereby the upper belt 1 moves up and down, and the lower belt 2 moves. You can adjust the interval between.

The cylinder 19 is operated by the following control method. That is, first, the upper and lower carriages 1
The distance h between the upper and lower carriages 17 and 15 is determined by a distance measuring device (for example, an eddy current type or ultrasonic type non-contact type displacement sensor, a differential transformer type, or a pulse count type) provided between the upper and lower carriages 17 and 15 on one side 15 thereof. Contact displacement sensor)
Measured by 20.

Further, as shown in FIG. 1, a casting machine; a burr detector (for example, a laser sensor or an image processing sensor) 21 is installed at the rear of the mold section (lower right in the drawing) and manufactured by casting. The presence or absence of burrs at the corners of the cast ingot 12 is detected.

The distance measuring device 20 and the burr detector 21
Is sent to the controller 22, where the differential of the cylinder 19 is discriminated and the output control of the elevating operation is performed.
The gap between the belt 1 and the dam block 3 is adjusted by adjusting the interval h between them.

More specifically, when the burr detector 21 detects the presence of burrs at the corners of the ingot 12, the cylinder 19 moves downward, lowers the upper carriage 17, and moves the upper and lower carriages 17, 15, the gap h between the upper belt 1 and the dam block 3 (FIG. 4)
(Refer to Δ in (a)). However, at this time, the interval amount measured by the vertical carriage 17, 15 interval measuring device 20 is compared with a preset minimum interval amount, and an interlock is applied so that the interval is not smaller than the set amount. This is to prevent the belt 1 from being damaged due to competition between the belt 1 and the dam block 3 when the gap between the belt 1 and the dam block 3 is too narrow.

According to the method for controlling the gap between the belt and the dam block of the present embodiment as described above, the burrs at the corners of the ingot (the molten metal is inserted into the gap between the belt 1 and the dam block 3 (FIG. 4A). The gap between the belt and the dam block is adjusted and controlled according to the presence or absence of ()) formed by (14)), so that a good quality ingot without burrs can be manufactured. Was. In addition, by applying the gap adjustment allowance to the interlock control,
Damage to the belt due to competition between the thermally expanded dam block and the belt due to the narrowing of the gap between the belt and the dam block no longer occurs.

In the above-described embodiment, the upper carriage 1
Although the cylinder 19 is used for the 7 elevating operation, a screw jack can be used instead.

[0020]

As described above, according to the present invention, the gap between the belt and the dam block is controlled to an appropriate amount, so that burrs of the ingot due to insertion of the molten metal into the gap are prevented. The purpose of the present invention is to provide a method for controlling the gap between the belt and the dam block of the twin-belt continuous casting machine; the objective can be achieved, and a high quality ingot can be produced, and the effect is great. It can be said that.

[Brief description of the drawings]

FIG. 1 is a schematic side view showing an embodiment of the present invention in a twin-belt type casting machine and ancillary equipment and a casting state by the twin belt type casting machine and auxiliary equipment.

FIG. 2 is a detailed explanatory view of an upper and lower belt gap adjusting mechanism in the embodiment of FIG. 1;

FIG. 3 is a schematic side view showing a conventional example in a twin belt type casting machine and a casting state by the twin belt type casting machine.

FIG. 4 illustrates a problem with the conventional example of FIG. 3,
(A) is an explanatory view of a molten metal insertion situation when a gap is provided between a belt and a dam block, and (B) is an explanatory view of a competition situation between a dam block and an upper belt when the dam block is expanded.

[Explanation of symbols]

 Reference Signs List 1 upper belt 2 lower belt 3 dam block 4 drive pulley 5 driven pulley 6 belt pulling device 7 dam block guide 8 pouring device 9 cooling spray band 10 dam block strap 11 dam block cooling device 12 ingot 15 lower carriage 16 support (Main body) Frame 17 Upper carriage 18a, 18b Movable link 19 Lifting cylinder 20 Interval measuring device 21 Burr detector 22 Controller

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Hironobu Maekawa 4-1-1, Kawajiri-cho, Hitachi-shi, Ibaraki F-term in Toyoura Plant, Hitachi Cable, Ltd. F-term (reference) 4E004 DA24 MC30 NA03 NB02 QB13

Claims (2)

[Claims] 1. A molten metal is poured into a casting mold formed by upper and lower driving belts and left and right dam blocks installed in parallel so as to be sandwiched between these belts. In the twin-belt casting machine of the manufacturing mechanism, a device for detecting burrs at the corners of the ingot is provided behind the casting machine, and a signal from the device is fed back to the control unit of the upper and lower belt interval adjusting mechanism. By doing
The belt of a twin belt type continuous casting machine characterized by adjusting the gap between the upper and lower belts and the left and right dam blocks.
Gap control method between dam blocks. 2. The gap control method according to claim 1, wherein a gap between the upper and lower belts is measured by a measuring device, and the belt is interlocked so as not to be less than a set interval amount.