JPS61108455A - Endless track type continuous casting machine - Google Patents

Abstract

PURPOSE:To produce easily an ingot and to improve the quality thereof by pushing dam blocks into a casting direction in the inlet side of a mold, adopting rolling friction for the friction between dam side guides and a moving dam and guiding the bearing of the moving dam with the side faces thereof. CONSTITUTION:The moving dam 2 which is freely synchronously rotatable is provided to both side parts of rotatable upper and lower belts 3, 4 to constitute an endless track type mold. A pushing device 11 which pushed forcibly the dam blocks of the dam 2 is provided on the inlet side of such mold to eliminate the space between the dam blocks. A freely rotatable roller 12 is pivotally fitted to the ingot side of each dam side guide 6 and the transverse movement of the dam 2 is controlled by the roller 12. THe rolling friction is adopted for the friction thereof to decrease scratching flaws, etc. Front and rear rollers 8', 9' of a cooling box 5 are disposed vertically to the dam 2 to guide both side faces of the dam 2. The descending of the am occurring in the elongation of the dam 2 is detected by a detector 13 and the cooling box 5 and the rollers 8', 9' are lowered by a cylinder device 15.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a moving dam type endless track continuous casting machine.

(Prior art) There are two methods for forming the short side of the mold area in a twin belt caster: a fixed dam method and a moving dam method. In order to prevent the negative effects of endothermic thermal expansion, a water-cooled structure and anti-seizure measures must be taken, which makes the structure complicated.Also, since the slab can slide directly on the fixed dam, it reduces the wear of the fixed dam. During rolling, the short side quality deteriorates due to seizure, and molten metal flows into the gap between the slab side and the short side wall caused by solidification shrinkage, resulting in double skin. If there are any flaws, they must be taken care of in the next process.

For these reasons, fixed dam type castings are not currently used for long-term casting.

A movable dam system was developed to solve the above-mentioned drawbacks of the fixed dam system, and is currently in general use.

In other words, in the moving dam system, a steel hoop +
A movable dam +21, which is made up of an endless number of rectangular dam locks slidably fitted onto the 1J, is arranged between the upper belt (3) and the lower belt (4), thereby controlling the widthwise direction of the slab. This is to regulate dimensions.

By the way, the movable dam (2) generally does not have a drive device, and is placed on the lower belt (4) when the upper belt (3) is placed on the lower belt (4).
) and the lower belt (41), the structure is such that when the lower belt (41) is rotated, the lower belt (4) moves in various directions due to frictional force,
On the other hand, the moving dam receives heat when molten metal is cast into casters, and the temperature gradually rises. (21 is prevented from rising above a predetermined temperature.

In addition, (61 is the dam side guide, (7) is the entrance guide roller, ((to) (9) is the cooling box +5+
Front and rear flanged rollers are installed on the front and rear flanges, and these guide the moving dam.

As explained above, since the movable dam (2) thermally expands, it is necessary to prevent the 7-pipe (1) from breaking due to this thermal expansion.
Although the expansion allowance is taken in advance, there are problems as described below and problems caused by the expansion allowance.

(The origin of the invention) First, the movable dam (as a problem of the force itself, the movable dam C1 has a thermal expansion allowance of about 1/1000 of the total length,
-5 to 10 m if the thermal expansion allowance is concentrated in one place.
A gap of about m in diameter is dispersed in several places, resulting in gaps. When the meltable metal flows into this gap and solidifies, the slab is pulled by the dam block on the exit side of the caster and breaks, making it impossible to cast. Conventionally, to avoid this situation, a gap is provided on the caster exit side, or the dam block is artificially pushed in until there is no gap on the caster entry side. There are safety issues with such a method.

In addition, as mentioned above, the mobile dam (2) is not famous for its driving device, so even if there is a slight catch in the orbit of the mobile dam (2), the mobile dam [21] will stop and become like a fixed dam. . Therefore, it is necessary to eliminate as much as possible the frictional resistance factor between the moving dam ■ and each dam side guide liner (b). Conventionally, the liner was coated with 5i-ol or a graphite coating agent as an anti-seize agent. The problem is being addressed by increasing the hardness of the material.

However, when the molten metal 4 is cast, during the process of solidification and contraction of the molten metal in the caster, the slab may meander due to uneven cooling of the slab, internal warping of the dam, etc. When a lateral pushing force is applied to the movable dam 121 as shown in FIG. Rudder scratches, etc. will occur on the guide liner A121.As the rudder scratches, etc. gradually grow, the movable dam (2) may have stopped, or the movable dam 12+ may have moved to the guide liner (b). The short pieces of the slab are inserted into the 7-p1 at the same time.
This led to accidents such as breakage of No. 11, and eventually casting had to be stopped.

In order to prevent such shortcomings, we will endeavor to
141 and the movable dam 12), such as knurling or shot processing on the lower belt (4) of the dam contact surface, or knurling the lower part of the movable dam (21). , and even a guideliner (
Efforts have been made to increase the hardness and lubricate the contact area with (b), but these methods are not sufficient. Furthermore, since the movable dam (2) is moved by the drive of the lower belt (4), it is conceivable to drive it by holding it down with the upper and lower belts +31 +41. Receiving heat from just one side will cause thermal expansion, which will cause dents and scratches on the belt and shorten the belt's lifespan.

Furthermore, one way to move the mobile dam (2) smoothly is to increase the weight of the mobile dam (2+).
) and the lower belt (there is a way to increase the frictional force with the belt).

However, this method naturally has its limitations due to constraints on actual work, such as handling during installation and removal. Therefore, it is necessary to use the maximum movable dam (210 weight).

However, conventionally, as shown in FIG.
It is a moving dam because the weight of the moving dam +21 is supported by the front and rear rows 2181 +91 installed before and after 0)
weight is not being utilized effectively. This is because, in the conventional method, the weight of the dam (m) during casting is received by the front and rear rollers +81 +91 as shown in Figure 7. The method disclosed in the issue is also a good idea as a way to eliminate the gap between mobile dams + 21, but for the reasons mentioned above, it is not possible to use mobile dams (
It becomes a factor that hinders the movement of 2).

Means for Solving Problem C] The present invention has been made to solve all of the above problems of a moving dam type endless track continuous casting machine, and its gist is as follows: The following three defeat factors are explained below.
``I am a frustrated serial casting detective.''

First, 4'l+1 is the upper and lower bells that can be drawn) +311
41 and these upper and lower bells) (The bells on both sides between 31+41) +31141 and 8! The dam block of the movable dam C) is forcibly pushed in the casting direction into the entrance side of the track type mold consisting of the JJ dam (2), and the gap between the dam blocks in the mold forming area is closed. Pushing device to eliminate (u)
f (see Figure 2).

Next, Ippon 2 has a rotatable roller (B) pivotally attached to the casting side of the dam side guide set 6, and the lateral movement of the movable dam (2) is restricted by the loader. (See Figure i@3). In other words, the dam side guide (6
) and the movable dam) by changing the friction between the conventional guide liner (11 friction) and the moving dam (11 friction) to the roller (b) transmission friction. It is intended to decrease.

Furthermore, the third one is the front and rear rollers +4 + of the cooling box (5).
9f was changed from the conventional method of supporting the weight of the moving dam (21) to a method of arranging rollers vertically to guide both sides of the moving dam 1210, and a front roller (slightly upstream of the moving dam 81) was installed. A device for detecting dam descent due to elongation of the movable dam (2) is provided, and the above-mentioned front and rear rollers +si
+9f is constructed so that it can always guide the side of the moving dam (see Figure 4). That is, by configuring it in this way, the weight of the moving dam +2) can be used effectively.

A device (9) that forcibly pushes the dam and lock in the casting direction.
), for example, the present applicant previously published
It is sufficient to adopt the pusher g2o1) proposed in No. 17.

- Furthermore, although the arrangement position gtb and the arrangement interval of the roller (2) pivotally connected to the casting side of the dam side guide (6) are not limited in any way, according to the experiments of the present inventor, the arrangement The interval is W≧2 for the length of one dam block)
It was found that when P (P: the spacing between a-ra (b)), the movement of the movable arm (2) becomes smooth, and it is better to place the casting position over the entire area from the caster entry side to the caster exit side. .

Further, as the dam lowering detection device (b), a known detection device such as a limit switch may be adopted, and based on the detection signal of this detection device aω, the front and rear rollers 18 of the cooling box (5); tsf is a moving dam (2
) may be a well-known mechanism using a hydraulic cylinder device 041 and a link machine muω as shown in FIG. 4, for example. For example, while the lowering of the dam (2) is being detected by the dam descending operator, the cylinder device 1α is operated, and the link 1. There is a button for lowering the cooling box +51 and the front and rear rollers +91 via the l structure (b) in the same way as the moving dam (2:).
If 81+91 is long enough, there is no need to install the detector 03), the cylinder device (2), or the link mechanism (b), but in this case, the movable dam ( Since the relative position of the cooling spray nozzle 2) with respect to the discharge displacement dam +21 changes, it is necessary to provide a sufficient margin for the injection angle of the cooling water blown out from the spray nozzles (g) and (b).

In addition, there is a roller (b) on the casting side of the dam side guide (61).
When pivotally mounting the dam side guide 16j, as shown in FIG.
16) and a large number of rollers (2) are pivotally connected thereto, for example, a roller chain or the like may be attached to the cast side of the dam side guide (6). However, the contact portion between each n-roller (2) and the movable dam (2) should be made as much as possible, since if there is movement in and out between each roller (b), the movement of the movable dam (2) will also follow this. It is necessary to keep the ingress and egress between the rollers (b) small (within ±0.2 m). Further, the dam drop detection device α3) is not limited to a limit switch, and may be any device with good responsiveness such as a differential transformer.

(Effects of the Invention) As described above, the present invention installs a pushing device for pushing the dam block in the casting direction on the entrance side of the mold, and uses rolling friction as the friction between the dam side guide and the 8-motion dam. Therefore, there are no gaps between the dam blocks, and hot water does not form between the dam blocks. In addition, it is possible to prevent galling flow and the like that occur in moving dams and dam side guides. Furthermore, since the present invention supports the movable dam by guiding its sides, the weight of the movable dam can be used effectively, which has a great effect on improving the quality of manufactured slabs and improving the operation rate. has.

[Brief explanation of the drawing]

Figures 1 to 8g4 show an embodiment of the endless track type continuous casting machine according to the present invention. Figure 3 is an explanatory diagram of the dam side guide, where (b) is a front view, (b) is an enlarged view of the main parts of (a), (c) is a side view of the trunk, and Figure 4 is a cooling box and dam descent detection device. FIG. 5 is an explanatory diagram of the conventional endless track type continuous casting 4:'&, and FIGS. 6 and 7 are explanatory diagrams of the problems of the conventional method. +21 is the moving dam, +31 is the upper belt, +41 is the lower belt, (5) is the cooling box, (6) is the dam side guide, 1B+ is the front roller, (91 is the rear roller, (b) is the pushing device, (b) is a roller. Patent applicant: Sumitomo Metal Industries, Ltd. (Figure 1, Figure 3 & r) Figure 41i1

Claims (1)

[Claims] (1) In a continuous casting machine equipped with an endless track type mold comprising rotatable upper and lower belts and movable dams arranged on both sides between these upper and lower belts so as to be rotatable in synchronization with the belt, A pushing device for pushing the dam block of the movable dam in the casting direction is provided on the entrance side of the mold, and a roller is rotatably pivoted at the tip of a dam side guide that guides the movable dam and restricts its lateral movement. ,
Furthermore, the continuous track type continuous casting machine is characterized in that front and rear rollers of a cooling box for cooling the movable dam are erected and supported so as to guide a side surface of the movable dam.