JP4324039B2 - Continuous casting mold - Google Patents

Description

  The present invention relates to a continuous casting mold capable of changing the width and thickness of a slab.

  In recent years, for the purpose of improving the yield of cast slabs, reducing capital investment, and reducing repair costs, slab molds having both a high-speed width variable function of slabs and an online mold short side replacement function have been widely used. On the other hand, molds with an electromagnetic stirring function have recently become widespread for the purpose of improving the quality of slabs. However, the electromagnetic stirring mold for slabs having all these functions has not been realized due to the limited space constraints.

  For example, in Patent Document 1, in a continuous casting facility having a mold in which a short-side copper plate is sandwiched between long-side copper plates, both end portions on the inlet side and outlets of both long-side frames having the long-side copper plate attached to opposite surfaces There is disclosed a mold thickness changing drive device in which both side end portions are connected by a pair of tie bars to constitute an entrance side drive system and an exit side drive system. However, in this case, both long side frames are connected by a pair of divers, and the drive shaft is installed around the long side frame, so the drive shaft is installed in the space where the electromagnetic stirring coil is installed. It was inappropriate.

  Further, as a variable thickness mold having a structure in which the drive shaft is not passed around the long side frame, in Patent Document 2, fixing members are arranged on both sides in the longitudinal direction of the fixed side long side frame, and between the opposing surfaces of the fixed member. A free-side long side frame is attached so as to be slidable in the thickness direction of the slab, and a plurality of short side frames lined with a copper plate lined in a desired slab thickness size can be interchanged between these long side frames. Has been disclosed. However, in this case, since the short side width varying actuator for changing the width of the slab is fixed to the fixed-side long side frame, when the thickness of the slab changes, the center part of the short side frame is pushed and pulled. However, the sliding material arranged on the side surface of the short-side frame hits the long-side copper plate, causing problems such as galling in the copper plate.

On the other hand, Patent Document 3 discloses a variable thickness mold in which a short side width variable actuator can be shifted in the thickness direction of the mold. However, in this case, shifting is performed using a worm jack, and a hydraulic cylinder required for variable high-speed width cannot be applied.
Japanese Utility Model Publication No. 6-54449 Japanese Utility Model Publication No. 2-35386 Japanese Utility Model Publication No. 6-5742

  The problem to be solved by the present invention is to provide a continuous casting mold capable of easily and quickly shifting a short side width varying actuator for varying the mold width in the mold thickness direction. .

The present invention includes a pair of long-side frames composed of a fixed-side long side frame and a free-side long-side frame attached to a mold fixing frame, and a pair of short-side frames sandwiched between the pair of long-side frames. A continuous casting mold in which a short side frame is connected to a short side width variable actuator, and a guide plate having a guide surface parallel to the thickness direction of the mold is fixed to the fixed side long side frame, and the guide wherein the surface enters into short-side width varying actuators, wherein the fastening force, the greater than the thrust of the short side width varying actuators, and a Ku pre Symbol short side width varying actuator such that loosening the fastening force along the guide surface with is set to a force that can be moved in the thickness direction of the mold thickness direction of the mold the fastening along the guide surface of the shorter side width varying actuator And characterized in that never loosened when moving in.

  In the present invention, the shift-side hydraulic cylinder for moving the short-side-variable actuator along the guide surface in the mold thickness direction can be provided on the fixed-side long-side frame.

  Furthermore, the magnitude of the fastening force to the guide surface of the actuator for changing the short side width can be set to a predetermined force by adjusting the hydraulic pressure supplied to the hydraulic actuator, and can also be set to a predetermined force by a mechanical spring. You can also

  According to the present invention, the magnitude of the fastening force to the guide surface of the variable width actuator is larger than the thrust of the short side variable actuator, and the fastening force can be used to change the short side width without loosening the fastening force. By setting the actuator to a force that can be moved in the mold thickness direction along the guide surface, the short-side width variable actuator can be easily and quickly shifted in the mold thickness direction along the guide surface. . In addition, the mechanism for moving the short side width actuator in the mold thickness direction can be installed in a compact space regardless of the shape of the electromagnetic stirring coil, enabling the realization of a multifunctional continuous casting mold. It becomes.

  In the present invention, the fastening force to the guide surface of the short side width varying actuator needs to be a force that does not lose the thrust of the short side width varying actuator when the mold width is changed. On the other hand, in order to move the short side width varying actuator along the guide surface in the thickness direction of the mold, the short side width varying actuator may be shifted by a force that overcomes the frictional force of the guide surface. The frictional force can be evaluated as the product of the fastening force on the guide surface of the short side width variable actuator and the friction coefficient of the guide surface. The magnitude of the fastening force is determined by adjusting the hydraulic pressure supplied to the hydraulic actuator. By setting the force to shift based on the value evaluated by the product of the fastening force and the friction coefficient, the short side width variable actuator can be easily and quickly shifted in the mold thickness direction. It becomes possible.

  Moreover, even if a hydraulic actuator is not used as the fastening means, if the fastening force is set to a predetermined value using a mechanical spring, the necessary force for shifting in the thickness direction of the mold can be calculated. By installing a shift hydraulic cylinder or jack bolt having a large thrust, the short side width variable actuator can be easily and quickly shifted in the thickness direction of the mold. As a result, it is possible to realize a continuous casting mold that is compact and has three functions of an electromagnetic stirring function, a slab width variable function, and an online slab thickness changing function.

  FIG. 1 is a plan view of a continuous casting mold according to the present invention, and FIG. 2 is a view taken along the line AA of FIG.

  In FIG. 1, both ends of a fixed-side long side frame 2 are fixed to a mold fixing frame 1, and both ends of a free-side long side frame 3 are placed so as to be movable in the slab thickness direction. A pair of short side frames 4 facing each other are sandwiched between the fixed side long side frame 2 and the free side long side frame 3 to form a mold. The long side frames 2 and 3 are provided with an electromagnetic stirring coil 5. Each short-side frame 4 is connected with a short-side width varying actuator 6, and the short-side width varying actuator 6 moves the short-side frame 4 in the width direction of the mold to set the width of the slab.

  A long side thickness changing cylinder 7 is provided between the fixed side long side frame 2 and the free side long side frame 3, and the long side thickness changing cylinder 7 is used to change the free side long side frame 3 to the thickness of the mold. Move in the direction to set the thickness of the slab. When the thickness is set, the long side frames 2 and 3 are clamped by the long side clamp / release cylinder 8 to maintain the thickness.

  As shown in FIGS. 1 and 2, the short side width varying actuator 6 is fastened to the guide plate 11 by the fastening mechanism 9 via the sliding plate 10. The guide plate 11 has a guide surface 11a parallel to the mold thickness direction, and the sliding plate 10 is fastened to the guide surface 11a. The guide plate 11 is fixed to the fixed-side long side frame 2 and the mold fixing frame 1. The sliding plate 10 is fixed to the short side variable actuator 6.

  The fastening mechanism 9 is mounted through a long hole 11 b formed in the guide plate 11. The long hole 11b is formed long in the thickness direction of the mold, so that the short side variable actuator 6 can be moved in the thickness direction of the mold while being fastened to the guide plate 11 by the fastening mechanism 10. It has become.

  In order to move the short side variable actuator 6 in the mold thickness direction, a shift hydraulic cylinder 12 is provided on the fixed long side frame 2 in the embodiment on the right side of FIG. The front end of the shift hydraulic cylinder 12 is connected to the short side width variable actuator 6 side. On the other hand, in the embodiment on the left side of FIG. 1, jack bolts 13 are provided on each of the long side frames 2 and 3. In both embodiments, the fixed side long side frame 2 is provided with a positioning stopper 14 for the short side width varying actuator 6 so as to be able to advance and retreat.

  FIG. 3 is a cross-sectional view of the main part showing an embodiment of the fastening mechanism. The fastening mechanism 9 shown in the figure is composed of a hydraulic actuator, and by adjusting the hydraulic pressure, the fastening force to the guide surface 11a of the sliding plate 10, that is, the short side variable actuator 6 (see FIG. 1). The fastening force to the guide surface 11a can be set to a predetermined value.

  FIG. 4 is a cross-sectional view of the main part showing another embodiment of the fastening mechanism. The fastening mechanism 15 shown in the figure comprises a bolt and nut mechanism, and a mechanical spring 15c is interposed between the bolt 15a and the nut 15b. In the fastening mechanism 15, the fastening force can be set to a predetermined value by appropriately selecting the spring constant of the mechanical spring 15c.

  In the above configuration, when changing the thickness of the mold, first, the long-side clamp / release cylinder 8 is operated to release the clamps of the long-side frames 2 and 3, and in this state, the long-side thickness changing cylinder 7 To move the free-side long side frame 3. Thereafter, the short side frame 4 is replaced to change the thickness of the mold.

  When the replacement of the short side frame 4 is completed, the short side width varying actuator 6 is moved so as to match the center of the short side frame 4 after the replacement. During the movement, the fastening mechanism 9 (hydraulic actuator) causes the fastening force to be greater than the thrust of the short side width variable actuator, and the fastening force is used to change the short side width without loosening the fastening force. Since the actuator 6 is set to a force capable of moving along the guide surface 11a in the mold thickness direction, the short side variable actuator 6 can be moved along the guide surface 11a without loosening the fastening force. It is possible to move in the thickness direction.

  In the embodiment on the right side of FIG. 1, the position of the short side width variable actuator 6 in the mold thickness direction is defined by the positioning stopper 14, and then the shift hydraulic cylinder 12 is operated to move the short side width variable actuator 6 to that position. Move. On the other hand, in the embodiment on the left side of FIG. 1, the jack bolt 13 is manually operated to move the short side width varying actuator 6 to the position defined by the positioning stopper 14.

  Further, when the fastening mechanism 15 of FIG. 4 is used as the fastening mechanism, by appropriately selecting the spring constant of the spring 15c, the fastening force is larger than the thrust of the short side width varying actuator 6, and the short side width is increased. The variable actuator 6 is set to such a size that it can be moved along the guide surface 11a in the mold thickness direction. Thereby, the short side width varying actuator 6 can be moved in the thickness direction of the mold without changing the fastening force of the fastening mechanism.

  INDUSTRIAL APPLICABILITY The present invention can be suitably used for a continuous casting mold having an electromagnetic stirring function, a slab width varying function, and a thickness changing function.

It is a top view of the casting mold for continuous casting of the present invention. It is an AA arrow line view of FIG. It is sectional drawing of the principal part which shows the Example of the fastening mechanism in the casting mold for continuous casting of this invention. It is sectional drawing of the principal part which shows the other Example of the fastening mechanism in the casting mold for continuous casting of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mold fixing frame 2 Fixed side long side frame 3 Free side long side frame 4 Short side frame 5 Electromagnetic stirring coil 6 Short side width variable actuator 7 Long side thickness changing cylinder 8 Long side clamp / release cylinder 9 Fastening mechanism 9a Rod 10 Sliding plate 11 Guide plate 11a Guide surface 11b Long hole 12 Hydraulic cylinder for shift 13 Jack bolt 14 Positioning stopper 15 Fastening mechanism 15a Bolt 15b Nut 15c Mechanical spring

Claims (4)

A pair of long-side frames composed of a fixed-side long-side frame and a free-side long-side frame attached to the mold fixing frame, and a pair of short-side frames sandwiched between the pair of long-side frames. In a continuous casting mold in which the frame is connected to a short side variable actuator,
A guide plate having a guide surface parallel to the mold thickness direction is fixed to the fixed-side long-side frame, and the short-side width variable actuator is fastened to the guide surface, and the fastening force is variable to the short-side width variable. greater than the thrust of the use actuators, and with are set to a force that can move the Ku before Symbol short side width varying actuator such that loosening the fastening force along the guide surface in the thickness direction of the mold, continuous casting mold, characterized in that the fastening is of never loosened when moving in the thickness direction of the mold along the guide surface short side width varying actuator.   The continuous casting mold according to claim 1, wherein a shift hydraulic cylinder for moving the short side width varying actuator along the guide surface in the thickness direction of the mold is provided on the fixed-side long side frame.   The continuous casting mold according to claim 1, wherein the magnitude of the fastening force can be set by a hydraulic actuator.   The continuous casting mold according to claim 1, wherein the magnitude of the fastening force can be set by a mechanical spring.

Images