JPH0686848U - Dummy bar head - Google Patents

Abstract

(57) [Summary] [Purpose] The sealing work with the mold can be done in a short time, and running costs can be reduced because there are few consumable parts. [Structure] A head body 1 that is connected to a dummy bar body 1 and can be inserted into a mold 6 is formed with a locking recess 7 into which molten metal is cast and the tip end of the cast piece is connected.
In the vicinity of the rear end portion of the outer peripheral surface, a seal material filling groove 8 capable of filling the seal material 9 was formed all around. [Effect] By performing the sealing material filling operation with the dummy bar head inserted into the mold and protruding upward, the sealing operation can be performed quickly.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a dummy bar head used when starting a continuous casting facility.

[0002]

[Prior art]

 The conventional dummy bar head has a recess for molten steel engagement at the rear end, and when it is ready for start-up, it is fed back along the casting path and inserted into the mold in the opposite direction. After filling the gap with the mold with sealing material to seal it and putting cold material such as scrap, supplying molten steel into the mold to drive the dammer bar, the slab is engaged in the engagement recess of the dummy bar head. There was a thing to stop, connect the slabs, and pull out.

Further, as disclosed in Japanese Utility Model Laid-Open No. 3-95152, a notch for connection is formed in a dummy bar head which is fed back along a casting path and inserted in the mold in the reverse direction at the time of preparation for starting. In some cases, the connecting member is attached to the connecting notch via the seal plate by protruding upward from the mold during insertion.

[0004]

[Problems to be solved by the device]

 However, the former dummy bar head has problems that it is difficult to pack the sealing material, and that it takes a long time and the preparation time for casting is long.

The latter is a consumable member in which the connecting member is embedded in the tip of the slab and cannot be reused, and a new connecting member is required each time it is used, which increases running costs. However, in the case of a large slab, there is a problem that the connecting member is also large and the connecting work between the dummy bar head and the connecting member cannot be easily performed.

The present invention solves the above problems and provides a dummy bar head which can perform a sealing work with a mold in a short time, can reduce a running cost because there are few consumable members, and does not require a connection work. To aim.

[0007]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the dummy bar head of the present invention is formed with a locking recess in which the molten metal is cast and the tip of the cast piece is connected to the head body that is connected to the dummy bar and can be inserted into the mold. However, in the vicinity of the rear end of the outer peripheral surface of the head body, a seal material filling groove capable of filling the seal material is formed over the entire circumference.

[0008]

[Action]

 According to the above configuration, the dummy bar is moved in the opposite direction from the lower side of the casting path via the pinch roller to insert the head body into the mold, and the head body is projected upward in the rolled state. Then, the sealing material is projected and packed into the sealing material filling concave portion of the head main body so as to be in contact with the inner surface of the mold, and the dummy bar is moved in the casting direction to store the head main body again in the mold. As a result, the gap between the head body and the inner surface of the mold is sealed by the seal material, and molten steel is supplied into the mold to enter the locking recess of the head body and solidify to connect the slab and the head body. After that, the dummy bar can be pulled out in the casting direction to start continuous casting.

Therefore, compared with filling the gap between the head body inserted into the mold and the inner surface of the mold with the seal material, workability is improved and sealing can be performed in a short time. Further, unlike the conventional case, since the connecting member embedded in the cast piece is not used, there are few consumables and the running cost can be reduced.

[0010]

【Example】

 An embodiment of the dummy bar according to the present invention will be described below with reference to the drawings. This dummy bar 1 is for performing continuous casting of type I steel in a vertical bending type continuous casting equipment, and is a dummy bar in which a plurality of connecting bodies 2 are connected via a horizontal pin 3 so as to be bendable in the bending direction of the casting path. It is composed of a main body 4 and a head main body 5 rotatably connected to the rear end of the dummy bar main body 4 via a horizontal pin 3.

The head body 5 has a similar I-shape in plan view and can be fitted into the casting port 6a of the mold 6 with a slight gap d, and the inside of the upper end surface 5a is curved. The molten steel solidified can be solidified and can be connected to the tip of the slab, and the head body 5 can be easily separated from the slab by applying a shock from the inside of the curve at a right angle in the latter half of the casting path. A locking concave portion 7 is formed, and a curved inclined surface 5b that allows the head body 5 and the cast piece to be inclined is formed on the inner side of the curved rear end surface 5a. Further, a sealing material filling groove 8 having a constant depth is formed in the outer peripheral portions of the rear end surface 5a and the curved inclined surface 5b and in the vicinity of the lower portion of the locking concave portion 7, respectively.

A method of using the dummy bar 1 will be described. The dummy bar 1 is moved in the opposite direction from the lower side of the casting path via the pinch roller, the head body 5 is inserted into the casting opening 6a of the mold 6, and the dummy bar 1 is further moved to roll the upper portion of the head body 5 into a rolled state. 6 Project upward and stop. Then, a sealing material (for example, alumina and silica fibers formed in a rope shape) 9 is projected and packed into the sealing material filling concave portion 8 of the head main body 5 so that the tip end contacts the inner surface of the casting port 6a. After filling the sealing material 9, the dummy bar 1 is moved in the casting direction by the pinch roller, and the head main body 5 is housed in the casting port 5a again. At this time, as shown in FIG. 5, by disposing the guide plate 10 around the head body 5 so that the sealing material 9 is not deformed and a gap is generated, the tip of the sealing material 9 is deformed or cut. Without being touched, it is fitted into the casting port 5a, and in the fitted state, the sealing material 9 is bent upward as shown in FIG. 6 and can withstand the pressure of molten steel from above. As a result, the gap d between the head body 1 and the casting opening 6a of the mold 6 is reliably sealed by the sealing material 9. Then, after filling a cold material C such as a scrap which prevents the head body 5 from melting, the molten steel M is injected into the mold 6 from the tundish through a nozzle, and the molten steel M is filled in the casting port 6a to fill the head. It enters into the locking recess 7 of the main body 5 and solidifies, thereby connecting the slab and the head main body 5 and pulling out the dummy bar 1 in the casting direction to start continuous casting.

According to the above configuration, the sealing material 9 is filled outside the mold 6 as compared with the conventional case where the gap between the head main body and the inner surface of the mold is filled with the sealing material. The workability is good and the work can be done in a short time. Moreover, since a connecting member embedded in a cast piece is not used unlike the conventional case, the number of consumables is small and the running cost can be reduced.

[0014]

[Effect of device]

 As described above, according to the dummy bar head of the present invention, the sealing material is filled in the sealing material filling groove of the head body protruding outside the mold to seal the head body. Compared with filling the gap between the inner surface of the mold and the sealing material, the workability is good and the sealing work can be performed in a short time. In addition, since the locking recess that allows the slab to be easily separated is formed, there is no need for a connecting member to be embedded in the slab as in the conventional case, and handling of a heavy connecting member is not required, so that the running cost can be reduced. Can be reduced.

[Brief description of drawings]

FIG. 1 is a side view of a dummy bar head according to an embodiment of the present invention in a mounted and used state.

FIG. 2 is a front view showing a mounted and used state of the dummy bar head.

FIG. 3 is a perspective view showing the dummy bar head.

FIG. 4 is a plan view showing the dummy bar head.

FIG. 5 is a front view showing a mounted state of the dummy bar head.

FIG. 6 is an enlarged cross-sectional view of a sealing material showing a mounted state of the dummy bar head.

[Explanation of symbols]

 1 Dummy Bar 2 Connected Body 3 Horizontal Pin 4 Dummy Bar Main Body 5 Head Main Body 5a Rear End Surface 5b Curved Sloping Surface 6 Mold 6a Casting Port 7 Locking Recess 8 Sealing Material Filling Groove 9 Sealing Material 10 Guide Plate M Molten Steel C Cooling Material

Claims (1)

[Scope of utility model registration request] 1. A head body which is connected to a dummy bar and can be inserted into a mold is provided with a locking recess into which molten metal is cast and the tip of a slab is connected, and the rear end of the outer peripheral surface of the head body. A dummy bar head, characterized in that a sealing material filling groove capable of filling a sealing material is formed in the vicinity of the portion over the entire circumference.