JPH0130581B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a mold vibration device for a curved continuous casting machine.

Generally, in order to prevent slabs from sticking to the mold during continuous casting, a method is used in which the mold itself of a curved continuous casting machine is vibrated by the stroke of its locus along the radius R of curvature. In this case, the accuracy of the vibration locus along the radius of curvature R needs to be somewhat strict in order to minimize surface flaws occurring in the slab. The most straightforward method of such a mold vibrating device is the single-lever method, in which the mold is placed on a vibrating lever with a length that matches the radius of curvature and gives vertical motion; however, when the radius of curvature is large, In this case, the length of the vibrating lever has to be increased accordingly, resulting in insufficient rigidity of the lever and lever fulcrum, increased trajectory error due to thermal expansion, and difficulties in mechanical assembly and maintenance due to the long lever. Conventionally, many ideas have been made and implemented regarding mold vibration mechanisms to replace the single lever type.

For example, FIG. 1 shows what is called a four-point cam system, which has a structure in which a displacement (stroke) is applied to the mold by a two-to-four type vibration generating mechanism, and a trajectory is secured by a pair of guide parts. Furthermore, FIG. 2 shows what is called the shot lever method, in which two pairs of shot levers are used to give a pseudo-circular locus to the mold. These conventional vibration devices include, for example:
The former requires vibration generating mechanisms at four locations, making maintenance difficult due to the complex mechanism, while the latter has the disadvantage of having to maintain the vibration generating mechanism in a narrow space inside the aircraft due to its structure. However, the following drawbacks are common to conventional methods.

In other words, trajectory accuracy during mold vibration needs to be ensured through continuity with the slab guide path of the slab support device following the mold, so in the conventional method, the mold vibration device and necessitated the adoption of a separate mechanism. For example, FIG. 3 shows an example of a conventional mechanism for ensuring continuity. The lower end of the support device whose alignment has been adjusted along the radius of curvature R is pivotally supported so as to be able to swing (arrow in the figure), and the guide portion at the upper end is engaged with a guide protruding from the mold, thereby eliminating mechanical or mechanical play. This is designed to ensure the continuity of the slab support device guide path against mistakes in the mold trajectory caused by unavoidable causes such as: However, adopting such a mechanism unnecessarily complicates the mechanism and increases maintenance difficulties, especially for continuous casting machines that require quick replacement and maintenance of molds, support devices, etc. in the event of a breakout or other accident. undesirable as such.

The present invention has been made with the aim of eliminating the above-mentioned drawbacks, and has a structure that can ensure the accuracy of the vibration trajectory of the mold over a long period of time without impairing continuity with the slab support device, and has a simple mechanism. The purpose of the present invention is to provide a mold vibrating device for a curved continuous casting machine, which improves maintainability by improving maintenance efficiency and allows the entire structure to be sufficiently maintained outside the machine.

The present invention will be explained in detail below based on the drawings.

FIG. 4 shows an example of the mold vibration device according to the present invention.
Further, FIG. 5 is a cross-sectional view of FIG. 4, and FIG. 6 is a simple model of the vibration mechanism. In FIG. 4, a mounting frame 4 is rotatably attached to a vibrating lever 6 via a rotation shaft 3 below both sides of a mold receiving frame 2 that fixes a curved mold 1 having a radius of curvature R. Curved mold 1 and mold support frame 2
is exchangeably fixed to the mounting frame 4 by a locking device 5. One end of the vibration lever 6 is supported by a vibration fulcrum 7 provided on a base frame 8 on the inside of the curved arc, and a vibration generator 9 on the base frame 8 is connected to the other end of the lever 6.

Here, as shown in Fig. 6, the center A of the vibration fulcrum 7
is arranged on a straight line connecting the center C of the rotating shaft 3 and the continuous casting machine curvature center O, and the vibration radius L of the mold is smaller than the continuous casting machine curvature radius R. On the other hand, a guide rail 10 is attached to the mold receiving frame 2 so as to be located further below the rotation axis 3 of the mounting frame 4. By engaging with the guide rolls 13, 14 in the slab support device 12, the curved mold is guided and the vibration locus is determined.

The base frame 8 is removably fixed to the frame 16 by a locking device 15. In this apparatus, the curved mold 1 can be removed individually using the hanger 17, or can be removed together with the slab support device 12 using the hanger 18 provided on the slab support device 12. Furthermore,
The entire structure can be replaced at once using the hanger 19 provided on the base frame 8.

Although this example shows an example of mounting the mold using the mounting frame 4, the rotating shaft 3 may be supported directly on the vibration lever 6. Further, a known method using an eccentric cam or the like can be adopted as the vibration generating mechanism. Although this example shows an example in which the vibration drive device 21 is installed outside the base frame via the detachable rotating shaft 20, the drive device may be installed inside the base frame. Further, both the vibration generating mechanism and the driving device may be installed outside the base frame via a known vibration transmission mechanism (not shown) between the vibration lever and the vibration lever. Further, the means for attaching the guide rail 10 and the guide rolls 13 and 14 may be reversed to that in this example, or a separate known guide device such as a sliding plate may be used.

Next, the vibration mechanism will be explained using a simple model shown in FIG. The figure shows the mold at the neutral point of vibration. O is the center of curvature of the curved continuous casting machine, A is the fulcrum of the vibration lever, B is the center point of the mold, C is the rotation fulcrum of the mold, D is the guide roll position of the mold guide, and E is the point where the vibration stroke is applied. , r is the radius of curvature of the guide rail, θ is the rotation angle of the vibration lever, a, b are,
Each vertical distance of CD is shown. Here, for simplicity, B,
An example is shown in which points C and D are arranged on the reference arc R. The mold rotates around point C on the vibrating lever due to the vibration stroke applied at point E, and performs a pseudo-circular motion whose posture is defined by guide D. The accuracy of the vibration locus of the mold, which is a problem, is determined by the above a, b,
It can be determined by simple geometric calculation using θ, r, and R as parameters. Therefore, the vibration mechanism can be designed by determining each parameter value so that the deviation is within the allowable value. What is important here is that L, a, and b can be selected quite freely within the allowable accuracy range, for example, points C and D can be both set below the mold center B. In other words, according to the vibration mechanism of the present invention, the lever fulcrum,
Since the positions of mechanical elements such as rotation axes and guides can be freely selected, it is possible to design the mold and surrounding complex mechanisms with sufficient consideration for maintainability. For example, R
=6000mm, L=2000mm, a=500mm, b=1000mm,
The maximum deviation for a vibration stroke of ±5.0mm is even after taking into account play in the rotating shaft, error in the guide, etc.
At around 0.1mm, it is sufficiently small compared to the allowable value (generally 0.2mm or less). In this example, since a = 500 mm and the rotation axis fulcrum C was placed at a sufficient distance below the mold center point B, there was no problem in installing the mold short side moving device 22 shown in Fig. 5. There was nothing to do.

In addition, it is theoretically optimal for the shape of the guide rail 10 to match the radius of curvature r with the vibration radius L of the vibration lever, but even if it is a linear guide in the tangential direction of the reference arc R at the guide position D, the influence on the accuracy will be It's so small that it can be ignored. Further, the guide position D is not limited to be placed on the reference arc R. On the other hand, guide position D is the mold guide rail 1 in offline maintenance.
0 is determined by centering the guide rolls 13 and 14 with respect to the mold reference position B and the rotation axis C, and the guide rolls 13 and 14 with respect to the reference arc of the slab support device guide path. The trajectory is ensured with sufficient accuracy, and at the same time, the continuity of the trajectory with respect to the guide path of the slab support device is ensured, and unlike the conventional example, a separate rocking mechanism for the slab support device is not required. In addition, the vibration radius L of the vibration lever 6 can be set sufficiently small with respect to the reference circular arc radius R as in the above example, and since it is a compact vibration mechanism, it can be used for a curved mold on a base frame, a slab support device, There is no problem in replacing the entire vibration mechanism at once.

As described above, the curved continuous casting mold vibrating device of the present invention (1) can obtain sufficient vibration accuracy with a simple and compact mechanism with a short vibrating lever length using a pair of vibrating levers and a guide section.

(2) No special equipment is required to maintain continuity between the mold's vibration locus and the slab support device guide path.

(3) Depending on maintenance needs, the mold alone or the mold/
It is possible to use the slab support device as an integrated unit or to replace the base frame all at once, improving maintenance efficiency. Moreover, by batch replacement, the entire structure can be easily maintained outside the aircraft.

...It has a great effect on reducing equipment costs and improving maintainability.

[Brief explanation of drawings]

1, 2, and 3 are examples of conventional vibration devices, FIG. 4 is an example of a vibration device according to the present invention, FIG. 5 is a cross-sectional view of FIG. It is a model diagram for explanation. 1...mold, 2...mold support frame, 3...rotation shaft,
4... Mounting frame, 5, 11, 15... Lock device, 6... Vibration lever, 7... Vibration fulcrum, 8... Base frame, 9... Vibration generator, 10... Guide rail, 12... Support device, 13, 14... Guide Roll, 16... Frame, 17, 18, 19... Hanging hand, 20
...Rotating shaft, 21... Vibration drive device, 22... Mold short side moving device.

Claims (1)

[Claims] 1 One end of a pair of mold vibration levers is supported by a vibration fulcrum provided on the base frame, the other end is connected to a vibration transmission device also provided on the base frame, and a curved The mold is exchangeably supported via a pair of rotating shafts, and the vibration fulcrum is located on a straight line connecting the center of curvature of the continuous casting machine and the rotation axis of the curved mold, and the vibration radius of the curved mold is connected. The radius of curvature of the casting machine is shorter than the radius of curvature of the casting machine, and a guide for a guide rail for moving the curved mold up and down is installed in a slab support device that is removably fixed on the base frame. A mold vibration device for a curved continuous casting machine, characterized in that a frame is detachably attached to a frame.