JPH0832358B2 - Side dam pressing device of twin-drum type continuous casting device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a side dam pressing device for pressing a side dam of a twin-drum type continuous metal strip casting device against an end surface of a cooling drum.

[Conventional technology]

FIG. 3 is a perspective view showing an outline of an essential part of a twin drum type metal strip continuous casting device as an example of a conventional device, and FIG. 4 is an enlarged side view of the essential part of FIG. It is a figure.

In the above figure, 101 is a pair of cooling drums,
They are supported so as to rotate in the directions indicated by arrows a in the figure. 102 is a pair of side weirs and its refractory material 102
A is installed so as to slide in close contact with the seal portions 101a on both side surfaces of the cooling drum 101. Reference numeral 103 denotes a pressing cylinder, which is attached to each of the rear surfaces of both side dams 102 at three locations. Reference numeral 107 denotes a side dam vibrating device, which is mounted on the back surface of each of the side dams 102.

In continuous casting of the metal strip S, first, both cooling drums 101 are rotated, and both refractory materials 102a are pressed against the seal portion 101a by the pressing cylinder 103 with a predetermined force to prevent leakage of the molten metal R, and Both side weirs 102
The vibrating device 107 vibrates laterally with a small width as indicated by a mark b in FIG. 3 to prevent the molten metal R from adhering to the refractory material 102a. Next, the molten metal is continuously supplied to a molten metal pool formed by both cooling drums 101 and side dams, solidified into a plate shape by the cooling drums 101, and drawn from below.

[Problems to be Solved by the Invention]

However, in the above conventional device, each pressing cylinder is
The pressure of 103 is maintained even if the contact surface of the refractory material 102a is worn. However, the material, temperature, contact condition, etc. at the pressed portion of the refractory 102a against the seal portion 101a are not necessarily the same, and a partial difference occurs in the amount of wear of the refractory 102a due to sliding with the seal portion 101a. However, there is no place where wear easily progresses and the wear tends to stop, and the uneven wear shortens the life of the refractory material 102a. Therefore, it is necessary to frequently replace the side weir 102, which is a factor that hinders an increase in one continuous casting time and continuous casting amount.

The present invention is intended to solve the above problems, and an object of the present invention is to provide a device for making the wear of the refractory material of the side weir uniform in the continuous casting of the metal strip, and prolonging its life.

[Means for solving the problem]

The side dam pressing device of the twin-drum type continuous casting apparatus of the present invention is a pair of sides pressed against both end faces of the cooling drum by a side dam pressing device having a pair of rotating cooling drums and a plurality of pressing members. In the hot water pool formed by the weir,
In an apparatus for continuously casting metal strips by supplying molten metal into a plate shape, the pressing amount of each pressing member is monitored, and the pressing amount of all the pressing members is made equal to cool the side dam. In order to maintain the parallel relationship between the refractory surface on the roll end surface side and the cooling roll end surface, the maximum pressing amount (=
(Amount of wear) and a pressing amount control means for moving the origin of the stroke of each pressing member to the end surface of the cooling roll according to the difference.

[Action]

In the present invention, when continuous casting of the metal strip is started, the refractory surface of the side dam slides and wears against both end surfaces of the cooling drum. Each pressing member moves both side dams to the cooling drum side while following the progress of wear.

At this time, the pressing amount (stroke) of each pressing member of the side dam is controlled by the pressing amount control device, whereby the pressing surfaces of the side dams pressed by the plurality of pressing members are inclined in any direction. Without doing so, the difference between the maximum amount of pressure and each amount of pressure is determined so that the amount of pressure of each pressure member is equal, and in accordance with the difference,
Move the zero point (= origin) of the stroke of each pressing member in the direction approaching the cooling roll end face, and continue to maintain the parallel relationship between the refractory surface on the cooling roll end face side of the side dam and the cooling roll end face. This prevents uneven wear of the fireproof surface of the side dam.

〔Example〕

An embodiment of the present invention will be specifically described below with reference to FIGS. 1 and 2. The same members and parts as those of the conventional device are designated by the same reference numerals in FIGS. 1 and 2, and a duplicate description will be omitted.

FIG. 1 is a plan view showing an outline of a main part of a twin drum type metal strip continuous casting apparatus, and FIG. 2 is a sectional view of a pressing cylinder.

In FIG. 1, 3 is a pressing cylinder that presses the same parts of both side dams 102 as in the conventional device,
A servo valve 11 is connected to each of the pressing cylinders 3, and the servo valve 11 is connected to a hydraulic pressure generating device and a control panel 12, which are not shown.

As shown in FIG. 2, the pressing cylinder 3 is composed of a cylinder 3a and a plunger 3b that can slide in the cylinder 3a, and the inner peripheral surface of the cylinder 3a is composed of, for example, a primary excitation coil and a secondary induction coil. Such a known position sensor 5
The position sensor 5 is connected to the control panel 12. A known target 6 is embedded in a portion of the outer peripheral surface of the plunger 3b facing the position sensor 5 such that, for example, a magnetic body and a non-magnetic body are alternately arranged in the axial direction at equal pitches. With this plunger 3b and cylinder 3a,
The hydraulic chamber a and the pullback hydraulic chamber b are formed.

In the present embodiment configured as described above, when the molten metal R is supplied to the oil sump portion formed by both the cooling drums 101 and the refractory material 102a to start continuous casting of the metal strip S, the refractory material 102a Seals 101a by each pressing cylinder 3.
Since it is pressed with the minimum pressure necessary for the cooling drum
The rotation of 101 and the vibration of the side dam 102 cause the sealing portion 101a.
The plunger 3b slides and wears, and each plunger 3b moves to the cooling drum 101 side by the amount of wear due to the pressure in the hydraulic chamber a. The control board 12 constantly detects the movement amount of the plunger 3b, that is, the target 6 by transmission from the position sensor 5, and when a difference occurs in the movement amount of each plunger 3b, the servo valve 11 causes the pressing cylinder 3 to move. While supplying hydraulic pressure to the hydraulic chamber a to move the respective plungers 3b, the cooling drum 101 maintains the parallel relationship between the entire refractory surface of the side dam 102 on the cooling drum 101 end face side and the cooling drum 101 end face. 101 Control to move toward the end face. This can prevent uneven wear of the refractory material 102a.

 Next, another embodiment of the present invention will be described.

A drum rotation speed detector (not shown) is attached to the cooling drum 101 of the apparatus of the above-mentioned embodiment and connected to the control panel 12. The other structure is the same as that of the above embodiment.

In this embodiment, first, the refractory material 10 per drum rotation speed is
The wear amount of 2a is calculated and input to the control panel 12 in advance. The drum rotation speed detector detects the rotation speed of the cooling drum 101 and transmits it to the control panel 12. The control board 12 is, for example, the cooling drum 10.
With each rotation of 1, the plunger 3b is moved by the servo valve 11 so that each plunger 3b moves to the cooling drum side by the wear amount of the refractory material 102a.
Cooling drum 101, the entire refractory surface on the end face side, and cooling drum 1
01 The uneven wear of the refractory material 102a is prevented by controlling the cooling drum 101 so that the refractory material 102a moves in a direction approaching the end surface while maintaining the parallel relationship with the end surface.

〔The invention's effect〕

As described above, in the present invention, the pressing amount control means is provided in each pressing member of the side dam pressing device, and the side dam is moved in parallel to the cooling drum side, so that the wear amount of the fire resistant surface of the side dam is reduced. It is possible to control them evenly and prevent their uneven wear.

Therefore, the life of the refractory surface of the side weir becomes long, and the side weir can be used continuously for a long time, so that the continuous casting amount per one time can be increased.

[Brief description of drawings]

FIG. 1 is a plan view showing the outline of an essential part of a twin drum type metal strip continuous casting apparatus as one embodiment of the present invention, FIG. 2 is a sectional view of a pressing cylinder, and FIG. 3 is a twin section of a conventional apparatus. FIG. 4 is an enlarged perspective view of a main part of the drum type metal strip continuous casting apparatus, and FIG. 4 is a side view in which a part of the main part of FIG. 3 is enlarged. 3 …… Pressing cylinder, 3a …… Cylinder, 3b …… Plunger, 5 …… Position sensor, 6 …… Target, 11 …… Servo valve, 12 …… Control panel, 101 …… Cooling drum, 101a …… Seal part , 102 …… side weir, 102a …… refractory, R …… molten metal, S …… metal strip.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasuhiro Yamagami 1-1-1, Emitsu, Hachiman-ku, Kitakyushu, Kitakyushu, Fukuoka Inside the Engineering Department, Nippon Steel Co., Ltd. (72) Kensuke Shimomura, Mitsuichi, Yamaguchi Shimada 3434 No. Nippon Steel Co., Ltd. Kosaku Kogyo (56) References JP 59-193741 (JP, A) JP 63-177944 (JP, A) JP 60-162558 (JP, A) )

Claims (1)

[Claims] 1. A twin-drum type continuous casting in which a molten metal is supplied to a molten metal pool portion formed by a pair of rotating cooling drums and a pair of side dams to solidify the molten metal into a plate shape, and a metal strip is continuously cast. A side dam pressing device belonging to the device, comprising a plurality of pressing members so as to press the refractory surface constituting the side dam at a plurality of pressing points, and monitoring the pressing amount of each of the pressing members, Find the difference between the maximum pressing amount and the pressing amount of each pressing member, and maintain the parallel relationship between the refractory surface on the cooling roll end face side of the side dam and the cooling roll end face according to the difference. A side dam pressing device for a twin-drum type continuous casting device, characterized in that it is provided with a pressing amount control means for moving the cooling roll in a direction approaching the end surface of the cooling roll.