JP2008149342A - Twin roll casting machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent bad shapes of a strip made of metal having high thermal conductivity. <P>SOLUTION: The twin roll casting machine comprises a pair of cooling rolls 1 horizontally arranged in a row, and a pair of side weirs 9 arranged so as to sandwich the cooling rolls 1 in the axial direction. Barrel weirs 10 are arranged above the respective cooling rolls 1 so as to be sandwiched between a pair of the side weirs 9 so as to come into surface contact with the portions of the surfaces of a pair of the side weirs 9 on the side of the molten metal reservoir 3. A molten metal receiving plate 11 is provided over the whole length of the upper end of one of the barrel weir 10 so as to horizontally project toward the side opposite to the gap between the cooling rolls. Further, the upper end of the other barrel weir 10 and the upper ends of the respective side weirs 9 are elongated upward, and then a molten metal receiving weir 12 is arranged so as to continue to the other side weir 9 from one of the side weirs 9 along the outer edge of the molten metal receiving plate 11. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a twin roll casting machine.

  As a method for directly producing a strip from a molten metal, there is a twin-roll continuous casting method in which the molten metal is supplied between a pair of horizontally arranged rolls and the solidified metal is fed into a thin strip shape.

  FIG. 3 shows an example of a twin roll casting machine, which includes a pair of horizontally arranged cooling rolls 1 and a pair of side weirs 2 arranged so as to sandwich the cooling roll 1 in the axial direction. A barrel weir 4 extending in the axial direction and in surface contact with a portion of the pair of side weirs 2 on the side of the molten metal reservoir 3 is provided on the upper side of each cooling roll 1 (see, for example, Non-Patent Document 1).

  The cooling roll 1 is configured such that cooling water flows through it and the roll gap can be adjusted in accordance with the thickness of the strip 5 to be produced.

  The rotation direction and speed of the cooling roll 1 are set so that each outer peripheral surface moves at a constant speed from the upper side toward the roll gap.

  One of the barrel weirs 4 is provided with an inclined plate 6 connected to the upper end thereof, and the molten metal 8 poured out from the crucible 7 by the inclined plate 6 is guided to a space surrounded by the side weir 2 and the barrel weir 4. The molten metal pool 3 is established.

  That is, when the cooling roll 1 is removed by circulating the cooling water and the molten metal pool 3 is formed and the cooling roll 1 is rotated, the molten metal 8 is solidified on the outer peripheral surface of the cooling roll 1 to form a solidified shell. The strip 5 bonded at the roll gap is sent out below the cooling roll 1.

  At this time, a pressing force is applied to shaft boxes (not shown) pivotally supporting the neck portions of the respective cooling rolls 1 so as to be close to each other so that the produced strip 5 has a target plate thickness.

The above-described twin-roll caster is for manufacturing the strip 5 from the molten metal 8 of a high thermal conductivity metal such as an aluminum alloy having a higher thermal conductivity and lower density than that of the steel. Solidification that occurs when the weir 4 is provided and the liquid level of the molten metal reservoir 3 formed in the space surrounded by the side weir 2 and the barrel weir 4 is moved away from the roll gap as much as possible, and the meniscus on the surface of the molten metal reservoir 3 vibrates. This prevents the non-uniformity from affecting the strip 5.
Proceedings of the Joint Plasticity Processing Conference 55th

  However, in the twin roll casting machine shown in FIG. 3, since the molten metal 8 flowing out from the crucible 7 is guided to the inclined plate 6 and poured into the surface of the molten metal reservoir 3, it is difficult to keep the molten metal reservoir 3 in a stable state. Unevenness cannot be reliably prevented.

  An object of the present invention is to provide a twin roll casting machine capable of keeping a molten metal pool in a stable state.

  To achieve the above object, the present invention comprises a pair of cooling rolls arranged horizontally and a pair of side weirs arranged so as to sandwich the cooling rolls in the axial direction, and extends in the cooling roll axial direction and has a pair of A barrel weir that is in surface contact with the side of the molten metal reservoir of the side weir is provided on the upper side of each cooling roll, and a hot water receiving plate that projects horizontally to the opposite side of the roll gap over the entire length of the upper end of one barrel weir. The upper end of the barrel weir and the upper end of each side weir are extended, and a hot water receiving weir extending from one side weir to the outer edge of the hot water receiving plate to the other side weir is provided.

  That is, the molten metal, which is the raw material of the strip, is poured toward the hot water receiving plate located just above the roll gap, and the molten metal pool in the space surrounded by the side weir and the barrel weir is not disturbed as the molten metal is replenished. Like that.

  In addition, in the vicinity of the barrel weir on the top surface of the hot water receiving plate, a structure having a uniform height extending from the center in the longitudinal direction of the barrel weir to the vicinity of both ends is adopted, and the molten metal traveling from the hot water receiving plate side to the molten metal reservoir side Reduce the momentum of the flow.

  Furthermore, in the space surrounded by the side weir and the barrel weir, a restriction plate having a slit extending from the center in the longitudinal direction of the cooling roll to the vicinity of both ends is adopted, so that the periphery thereof is connected to the side weir and the barrel weir, Direct the flow of molten metal to the roll gap.

  According to the twin roll casting machine of the present invention, the following excellent effects can be obtained.

  (1) During continuous casting of the strip, if the molten metal is poured toward the hot water receiving plate, the molten metal pool in the space surrounded by the side weir and the barrel weir is not disturbed as the molten metal is replenished, and the molten metal is kept in a stable state. As a result, the strip does not have a defective shape due to non-uniform solidification.

  (2) If a protrusion having a uniform height extending in the longitudinal direction of the barrel weir is provided in the vicinity of the barrel weir on the upper surface of the hot water receiving plate, the momentum of the flow of the molten metal going from the hot water receiving plate side to the molten metal pool side can be suppressed. The molten metal pool just above the roll gap is not disturbed.

  (3) If a regulating plate having a slit extending in the longitudinal direction of the cooling roll is provided so that its peripheral edge is connected to the side weir and the barrel weir, the flow of the molten metal can be directed uniformly to the roll gap.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 and 2 show an example of a twin roll casting machine. In the figure, the same reference numerals as those in FIG. 3 denote the same parts, and a pair of cooling rolls 1 arranged horizontally, these A pair of side weirs 9 disposed so as to sandwich the cooling roll 1 in the axial direction, and extend in the roll axial direction and directly above the center of rotation of each cooling roll 1 and on the side of the molten metal pool 3 of the pair of side weirs 9 A barrel weir 10 is provided in surface contact with this part.

  The lower edge portion of the barrel weir 10 may be configured to abut against the outer peripheral surface of the cooling roll 1 over the entire length, or may be configured to separate a certain minute distance.

  One barrel weir 10 is connected to a hot water receiving plate 11 that protrudes horizontally to the opposite side of the roll gap over the entire length of the upper end.

  Each upper end edge of the other barrel weir 10 and each side weir 9 is at a position higher than the upper end portion of one barrel weir 10 where the above-described hot water receiving plate 11 is connected, and the outer edge of the hot water receiving plate 11 A hot water receiving weir 12 from the side weir 9 to the other side weir 9 is provided.

  A protrusion 13 having a uniform height extending from the longitudinal center of the barrel weir 10 to the vicinity of both ends is provided in parallel to the roll axis at a location near one barrel weir 10 on the upper surface of the hot water receiving plate 11.

  Further, a horizontal regulating plate 15 having a slit 14 extending from the center of the roll gap to the vicinity of both ends is provided in a space surrounded by the side weir 9 and the barrel weir 10 so that the peripheral edge thereof is continuous with the side weir 9 and the barrel weir 10. ing.

  When producing the strip 5 made of a high heat conductive metal, the molten metal 8 can be placed on the molten metal receiving plate 11 so that the surface of the molten metal pool 3 just above the roll gap exceeds the protrusion 13 provided on the molten metal receiving plate 11. Pour as far away as possible from the gap between the rolls.

  Next, when the cooling roll 1 is rotated while removing the cooling roll 1 by circulation of the cooling water, the strip 5 in which the solidified shells are bonded together with the roll gap is sent downward.

  As described above, when the molten metal 8 is poured toward the molten metal receiving plate 11, the molten metal reservoir 3 in the space surrounded by the side weir 9 and the barrel weir 10 is not disturbed with the replenishment of the molten metal 8, and the height is increased. The uniform protrusion 13 suppresses the momentum of the flow of the molten metal 8 traveling from the molten metal receiving plate 11 side to the molten metal pool side, and the flow of the molten metal 8 is uniformly directed to the roll gap by the slits 14 of the regulating plate 15, so that the solidification is uneven. The shape defect of the strip 5 due to the above does not occur.

  In addition, the twin roll casting machine of this invention is not limited only to embodiment mentioned above, Of course, it can add a change in the range which does not deviate from the summary of this invention.

  The twin roll casting machine of the present invention can be applied to the production of strips made of various high heat conductive metals.

It is a perspective view which shows an example of the twin roll casting machine of this invention. It is a longitudinal cross-sectional view which shows the twin roll casting machine relevant to FIG. It is a longitudinal cross-sectional view which shows an example of the conventional twin roll casting machine.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cooling roll 9 Side dam 10 Barrel dam 11 Hot water receiving plate 12 Hot water receiving dam 13 Protrusion 14 Slit 15 Control board

Claims (3)

  A pair of cooling rolls arranged horizontally, and a pair of side weirs arranged so as to sandwich the cooling rolls in the axial direction, and extending in the axial direction of the cooling roll and in surface contact with the molten metal pool side portion A barrel weir is provided on the upper side of each cooling roll, and a hot water receiving plate that protrudes horizontally to the opposite side of the roll gap is connected over the entire length of the upper end of one barrel weir, and the upper end of the other barrel weir and the upper end of each side weir are connected. A twin roll casting machine characterized in that a hot water receiving weir extending from one side weir to the outer edge of the hot water receiving plate and extending to the other side weir is provided.   The twin roll casting machine according to claim 1, wherein a protrusion having a uniform height extending from the center in the longitudinal direction of the barrel weir to the vicinity of both ends is provided at a location near the barrel weir on the upper surface of the hot water receiving plate.   3. A regulating plate having a slit extending from the center in the longitudinal direction of the cooling roll to the vicinity of both ends is provided in a space surrounded by the side weir and the barrel weir so that the peripheral edge thereof is continuous with the side weir and the barrel weir. A twin roll casting machine as described in.

Images