JPH03281042A - Equipment for manufacturing hot strip - Google Patents

Abstract

PURPOSE:To efficiently manufacture a high quality strip by setting a stirring rod as freely rotatable in flowing passage in a forming mold forming the flowing passage, of which the flowing passage cross sectional face is gradually contracted from an inlet part toward an outlet part and the shape of flowing passage cross sectional face at the outlet part becomes rectangular shape. CONSTITUTION:Molten metal 2 in a tundish 1 is supplied into the flowing passage 4 in the forming mold 5 from a nozzle 3 and stirrers 14, 15 are rotated with driving device to give the molten metal 2 in the flowing passage 4 the stir-shearing force. By breaking grown dendritic crystal structure, uniform fine spherical crystal grains are intermingled in the molten metal 2 to form semi-solidified metal slurry 16. The slurry 16 is cooled in the forming mold 5 and cast as a slab 6 for the strip from the outlet 18. After shifting this into horizontal state through guide rolls 7, this is reheated in a heating furnace 8 and rolled with a rolling mill 9 to make the strip 10. After cooling this in a cooling device 11, this is coiled to a downcoiler. By this method, the high quality strip can be efficiently manufactured, and miniaturization of the equipment and cost down can be achieved.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to hot thin plate manufacturing equipment.

[Prior Art] Conventional hot thin sheet manufacturing equipment generally processes molten metal 2 housed in a tandem shell 1 as shown in FIG.
Through the nozzle 3 connected to the bottom of the tundish I, as shown in Fig. 7.8.9, the flow path cross section is gradually narrowed from the inlet 17° to the outlet 18°, and the flow path cross section at the outlet becomes rectangular. The thin plate slab 6° is supplied to a forming mold 5′ in which a 4° path is formed, and the thin plate slab 6° is continuously pulled out from the forming mold 5° and conveyed to the downstream side by a large number of guide rolls 7.
After reheating the thin plate slab 6'' in a heating furnace 8, it is rolled by a rolling mill 9 to form a thin plate 10', and after cooling the thin plate 10' in a cooling device d111, it is passed through a down coiler 12.
I was trying to wind it up.

In addition, in FIG. 6, numeral 3 represents a cutting device.

[Problems to be Solved by the Invention] However, in the hot thin plate manufacturing equipment as described above, the molten metal 2 in the tundish I is directly cooled at 5° in the forming mold to cast the thin plate slab 6.
It was difficult to produce a high-quality thin plate of 10° because the crystal grains of 10° became coarse.

Further, a thin plate slab 6 pulled out from the forming mold 5''
It is necessary to gradually cool the thin plate slab 6 while conveying it to the downstream side by the guide roll 7, and the radius of curvature R when the thin plate slab 6 is transferred from the vertical state to the horizontal state is such that the thin plate slab 6° is not broken. In order to avoid this, it is necessary to set the size to a certain extent, which increases the height of the equipment, which also leads to an increase in equipment costs.

In addition, the thin plate slab 6° often recovers heat at the exit side of the forming mold 5°, resulting in breakout, which requires the operation to be stopped, and production efficiency is also reduced.

In view of these circumstances, the present invention aims to provide hot thin plate manufacturing equipment that can efficiently produce high-quality thin plates and can also reduce the size of the entire equipment.

[Means for Solving the Problems] The present invention supplies molten metal to a forming mold in which a flow path is formed in which the cross section of the flow path is gradually narrowed from the inlet to the outlet, and the cross section of the outlet section is rectangular. Casting thin plate slabs,
The hot thin plate manufacturing equipment is configured to be able to roll the thin plate slab using a rolling mill to produce a thin plate, and is characterized in that a rotatable stirring rod is disposed within the flow path of the forming mold.

[Function] Therefore, when a stirring shear force is applied to the molten metal in the channel by rotating the stirring rod in the forming mold, a semi-solid metal slurry is formed, and a thin plate with a rectangular cross section is formed from the semi-solid metal slurry. A slab is cast, and the thin plate slab is rolled by a rolling mill to produce a high quality thin plate.

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

FIGS. 1 to 5 show one embodiment of the present invention, and parts in the drawings denoted by the same reference numerals as in FIGS. 6 to 9 represent the same parts.

As shown in Figure 1.2, from the tundish 1 to the nozzle 3
The shape of the flow path 4 at the inlet part 17 of the forming mold 5 through which the molten metal 2 is supplied is changed from both sides of the nozzle 3 disposed at the center in the width direction of the forming mold 5 as shown in Fig. 3.4.5. A portion of the flow path 4 is formed to have a larger diameter than other portions by a required amount, and stirring rods 14 and 15 that are rotationally driven by a drive device (not shown) are disposed in the portion of the channel 4 that has been expanded in diameter.

Regarding the forming mold 5, from the inlet part 17 to the outlet 1
There is no difference from the conventional mold 5° in that the cross section of the flow path is gradually narrowed toward 8, and the cross section of the flow path at the exit portion becomes rectangular.

Next, the operation of the above embodiment will be explained.

As shown in FIG.
．． 4.5 When the stirring rods 14 and 15 shown in Fig. 5 are rotated by a drive device (not shown) and a stirring shear force is applied to the molten metal 2 in the channel 4, the growing dendrite crystal structure is broken and uniformly distributed in the molten metal 2. A semi-solid metal slurry 16 is formed in which fine spherical crystal grains are mixed.

The semi-solid metal slurry 16 is cooled in the forming mold 5 and cast out from the outlet 18 of the forming mold 5 as a thin plate slab 6 having a rectangular cross-section.

The thin plate slab 6 cast from the forming mold 5 is conveyed downstream by guide rolls 7 as shown in FIG. is rolled into a thin plate lO.

After the thin plate 10 is cooled in a cooling device 1fll,
It is wound up by the down coiler 12.

In this way, a thin plate slab 6 is cast from the semi-solid metal slurry 16 in which the growing dendrite crystal structure is crushed and uniform fine spherical crystal grains are mixed in the molten metal 2, and a high quality thin plate IO is manufactured from the thin plate slab 6. can also,
The thin plate slab 6 cast from the forming mold 5 does not need to be gradually cooled while being conveyed to the downstream side as in the conventional case. R can be made smaller than before due to the improved strength of the thin plate slab 6, so the height of the equipment can be lowered.
It is possible to reduce equipment costs, and furthermore, it is possible to prevent the thin plate slab 6 from recovering heat on the exit side of the forming mold 5 and cause a breakout, and continuous operation is possible, which is useful for improving production efficiency.

Note that the hot thin plate manufacturing equipment of the present invention is not limited to the above-mentioned embodiments, and the number of stirring rods is not limited to two but may be any number, without departing from the gist of the invention. Of course, various changes can be made within the scope.

[Effects of the Invention] As explained above, according to the hot thin plate manufacturing equipment of the present invention, a rotatable stirring rod is provided in the flow path of the forming mold,
By casting thin plate slabs from semi-solid metal slurry, high quality thin plates can be manufactured efficiently.
It is possible to achieve the excellent effect of reducing the size and cost of equipment.

[Brief explanation of drawings]

FIG. 1 is an overall schematic diagram of one embodiment of the present invention, and FIG.
An enlarged view of the ■ part in the figure (corresponding to the cross section taken along the line ■-■ in FIG. 3), FIG. 3 is a partially cutaway perspective view of a forming mold according to an embodiment of the present invention, and FIG. 5 is a view along the V-■ arrow in FIG. 3, FIG. 6 is an overall schematic diagram of the conventional example, and FIG. 7 is an enlarged view of the FIG. 8 is a partially cutaway perspective view of a conventional mold, and FIG. 9 is a view taken along the line IX-IX in FIG. 8. 2 is molten metal, 4.4° is a channel, 5.5° is a forming mold, 6.6° is a thin plate slab, 9 is a rolling machine, 10.10'
is a thin plate, 14.15 is a stirring bar, 16 is semi-solid slurry 1
7 indicates an inlet, and 18 indicates an outlet.

Claims (1)

[Claims] 1) A thin plate slab is cast by supplying molten metal to a forming mold in which a flow path is formed in which the cross section of the flow path is gradually narrowed from the inlet to the outlet and the cross section of the outlet section is rectangular, and the thin plate slab is rolled. 1. Hot thin plate manufacturing equipment configured to be able to manufacture thin sheets by rolling with a machine, characterized in that a rotatable stirring rod is disposed within the flow path of the forming mold.