JPH0260423B2 - - Google Patents

Description

[Detailed description of the invention] Industrial applications The present invention relates to a continuous casting method.

Conventional technology In conventional continuous casting, a mold with a casting hole formed in the center is immersed in molten metal in a tundish, and a cast tube solidified in the casting hole is oriented in the axial direction of the casting hole. It was pulled out.

Problems to be Solved by the Invention In the conventional configuration described above, the quality of the cast tube to be cast is affected by the temperature and compositional distribution of the molten metal in the tundish, especially the molten metal in the casting hole of the mold. be done. When these are non-uniform, there is a problem in that the thickness of the cast tube is uneven, resulting in uneven tube wall thickness. Further, when cutting a cast pipe, since the cast pipe is continuously pulled out, the cutting torch must be moved in the axial direction of the pipe and rotated in the circumferential direction of the pipe, which is difficult to control.

The present invention solves the above-mentioned problems, and aims to provide a continuous casting method that maintains the temperature and composition of the molten metal uniformly, enables casting with uniform tube wall thickness, and facilitates cutting work. purpose.

Means for Solving the Problems In order to solve the above problems, the present invention provides continuous casting in which a casting mold placed immersed in molten metal in a tundish is rotated around the axis of a casting hole. While rotating the casting tube, the casting tube that is solidified and formed within the casting hole is rotated around the tube axis in synchronization with the rotation of the casting mold, and is pulled out in the axial direction of the casting hole. It is.

Function In the above configuration, the rotation of the casting mold stirs the molten metal in the tundish, making its temperature and composition uniform. Therefore, uneven thickness is prevented from occurring in the cast tube that is solidified and formed within the casting hole, and the wall thickness is kept uniform. In addition, since the casting tube is rotating during cutting, the cutting torch only needs to be moved in the drawing direction in synchronization with the drawing of the casting tube without rotating.
It can be easily controlled.

Embodiment Hereinafter, an embodiment of the present invention will be described based on the drawings. In FIGS. 1 to 3, a mold 1 is inserted through a through hole of a fixing member 2 and is placed immersed in a molten metal 4 in a tundish 3. The mold 1 has a hole 5 in the center for vertical casting.
, and is fixed to a circular mold mount 6 at its upper end. The mold mount 6 has a hole for the casting tube 7 to pass through in its center, and is supported by the fixing member 2 so as to be rotatable about the axis of the casting tube 7 . The peripheral edge of the mold mount 6 is formed with a gear part 8 , which meshes with a pinion 10 of a drive device 9 provided on the fixed member 2 . Above the mold mount 6, three or more pinch rollers 11 for pulling out the casting tube 7 are arranged such that the rotation axis 13 of the pinch roller 11 is tilted at a constant angle θ with respect to the pulling direction 12 of the casting tube 7. and are arranged around the casting tube 7. A cutting torch 14 is installed above the pinch roller 11 in the drawing direction 1 of the casting tube 7.
2 is movably provided.

As shown in FIG. 4, the pinch roller 11 is rotatably supported by a moving table 15, and is operatively connected to a motor 17 provided on the moving table 15 via a chain 16. The movable table 15 is rotatably supported by a position control servo motor 18, and the position control servo motor 18 is supported by a cylinder device 20 attached to a frame 19 that can freely move in and out.

The effects of the above configuration will be explained below. First, the mold mount 6 and the mold 1 are driven by the drive device 9 through the pinion 10 and the gear part 8.
is rotated around the axis of the hole 5, that is, the axis of the cast tube 7. In this state, the cast pipe 7 that is solidified and formed in the hole 5 has a reduced wall thickness because the temperature and composition of the molten metal 4 are made uniform by stirring the molten metal 4 by rotating the mold 1. Cast uniformly. The cast tube 7 that has been cast is pulled out in the axial direction of the cast tube 7 while being rotated around the axis of the cast tube 7 by the pinch rollers 11. At this time, the position control servo motor 18 rotates the movable table 15 to adjust the inclination angle θ, or the motor 17 adjusts the rotation speed of the pinch roller 11 to speed up the rotation rate that the pinch roller 11 gives to the casting tube 7. is synchronized with the rotational speed of the mold 1, and the drawing speed of the casting tube 7 is controlled. Since the pinch rollers 11 are brought into contact with the casting tube 7 at the same level from multiple directions by the cylinder device 20, the casting tube 7 is pulled out onto the axis of the hole 5 without swinging in the horizontal direction. .
Then, when the cast pipe 7 is pulled out to a predetermined length,
The casting tube 7 is cut while the cutting torch 14 is moved in the axial direction of the casting tube 7 in synchronization with the drawing speed of the casting tube 7. At this time, since the casting tube 7 is rotating, the entire circumference of the casting tube 7 can be easily cut without rotating the cutting torch 7.

Effects of the Invention As described above, according to the present invention, the molten metal in the tundish is stirred by the rotation of the mold, and the temperature and composition of the molten metal can be kept uniform.
Can prevent uneven thickness of cast pipes.

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention;
FIG. 2 is a diagram showing the positional relationship between the cast pipe and the pinch rollers, FIG. 3 is a view taken along the line aa in FIG. 1, and FIG. 4 is a plan view showing the support structure of the pinch rollers. 1... Mold, 5... Hole, 6... Mold mounting stand,
7... Casting tube, 8... Gear part, 9... Drive device,
10...Pinion, 11...Pinch roller.

Claims (1)

[Claims] 1. In continuous casting, a casting mold placed immersed in molten metal in a tundish is rotated around the axis of a casting hole, and a casting tube solidified and formed within the casting hole is A continuous casting method characterized by rotating the tube around the axis in synchronization with the rotation of the mold and pulling it out in the direction of the axis of the casting hole.