JP6331825B2 - Continuous casting mold equipment - Google Patents

Description

  The present invention relates to a continuous casting mold apparatus used for continuous casting of an ingot having a substantially rectangular cross section.

  An ingot (hereinafter sometimes referred to as “slab”) having a substantially rectangular cross-sectional shape is used for rolling, for example. Since the slab utilized for rolling may cause a rolling defect if the surface to be rolled does not have flatness, flatness is required for the surface to be rolled.

  In order to prevent quality defects, the slab is flattened by chamfering and removing the surface layer before rolling. In some cases, the chamfering process may be performed after removing a cast tip portion (front ear) having a quality problem with a slab cutting machine. Face scraps generated during this face cutting affect the product yield. And in order to reduce this surface shavings, it is effective to make the rolling surface of a slab as flat as possible from the beginning of casting.

  By the way, a metal such as aluminum or an aluminum alloy solidifies and shrinks when solidified. For this reason, it is difficult to make the cross-sectional shape of the slab the same as the cross-sectional shape of the mold (particularly, this tendency is remarkable at the initial stage of casting). Therefore, even if the mold surface forming the rolled surface is flat, the rolled surface of the slab may not be flat, and the cross section may be constricted.

  Solidification shrinkage varies depending on casting conditions. Specifically, solidification shrinkage varies depending on conditions such as slab size and alloy type, and solidification shrinkage varies between casting start and steady state. In particular, in the case of a slab having a rectangular cross-sectional shape, unlike the billet having a circular cross-sectional shape, the cooling state on the long side surface, the short side surface, and the corner portion is different, so that it is difficult to obtain uniform shrinkage behavior.

  Therefore, in order to solve these problems, the present applicants have proposed a mold apparatus in which a long long mold surface is curved outwardly among the mold surfaces forming the rolling surface of the slab (patent) Reference 1 and Patent Document 2). This mold apparatus includes a deformation mechanism that adjusts the degree of curvature of the long mold surface according to various conditions.

Japanese Patent Laid-Open No. 54-13422 JP 58-179540 A

  By the way, the deformation mechanism is connected to the outside of the long mold surface and draws the long mold surface outward to deform it. The deformation mechanism is provided with at least one actuator on at least one long mold surface (at least two on a pair of long mold surfaces). The actuator was operated using one drive source. Therefore, since each actuator operates only at the same timing, individual and complicated control cannot be performed.

  Conventionally, since the mold apparatus for performing continuous casting has been large-scale, the ratio of chamfering scraps by chamfering of the surface layer portion to the entire slab is small. Therefore, the product yield was sufficiently improved by the deformation mechanisms of Patent Documents 1 and 2. However, in recent years, small-sized continuous casting mold apparatuses have also been manufactured, and further improvement in product yield has been demanded. Moreover, the case where the slab from which the width | variety of the length direction of a long side (rolling surface) of a cross-sectional shape differs is cast simultaneously.

  From such a viewpoint, an object of the present invention is to provide a continuous casting mold apparatus capable of improving the product yield.

  The invention according to claim 1 for solving the above-mentioned problem is a continuous casting mold apparatus provided with a mold in which a pair of first mold members facing each other and a pair of second mold members facing each other are combined in a rectangular shape. A deformation mechanism for changing the mold surface shape of at least a pair of the first mold members, the deformation mechanism being provided for each of the plurality of actuators provided for each of the first mold members and for each actuator. A casting apparatus for continuous casting, comprising a plurality of drive sources.

  According to such a configuration, the first mold member can be deformed into a shape suitable for casting conditions by independently controlling a plurality of actuators provided for each first mold member. As a result, it is possible to reduce the surface shavings due to the surface machining of the surface layer portion, so that the product yield can be improved.

  The invention according to claim 2 is characterized in that three or more actuators are provided for one first mold member. According to such a configuration, since the curvature of the first mold member can be finely controlled, it can be deformed into a more optimal shape.

According to a third aspect of the present invention, the first mold member is composed of a long metal plate-like member, and the attachment position of the actuator to the first mold member is moved in the longitudinal direction of the first mold member. It is possible. According to such a structure, the deformation | transformation form of a 1st casting_mold | template member can be diversified.

  The invention according to claim 4 is characterized in that the first mold member is a side surface mold member constituting a long side part, and the second mold member is an end face mold member constituting a short side part. According to such a configuration, the curvature or the like of the long side portion can be easily changed.

  In addition, by arranging a plurality of continuous casting mold apparatuses according to the present invention and performing casting, it is possible to simultaneously cast slabs having different widths in the longitudinal direction of the long side surface of the cross-sectional shape, and to increase the length of the slab. Side flatness and dimensional accuracy can be improved.

  Furthermore, if the mechanism according to the present invention is combined with the mechanism of the variable width mold capable of changing the width in the length direction of the first mold member described in Japanese Patent Application Laid-Open No. 10-193043 filed earlier by the present applicant. It is possible to cast slabs having different widths in the length direction of the long side surfaces with good flatness.

  According to the continuous casting mold apparatus of the present invention, the product yield can be further improved.

It is the top view which showed the mold apparatus for continuous casting which concerns on embodiment of this invention. It is the top view which showed the deformation | transformation state of the casting apparatus for continuous casting which concerns on embodiment of this invention. It is the figure which showed the deformation | transformation mechanism of the casting apparatus for continuous casting which concerns on embodiment of this invention, Comprising: (a) is a top view, (b) is the II sectional view taken on the line of Fig.3 (a). It is the graph which showed the result of the deformation | transformation test done using the casting_mold | template apparatus for continuous casting which concerns on embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. A continuous casting mold apparatus 1 according to an embodiment of the present invention forms an ingot having a substantially rectangular cross section.

  As shown in FIG. 1, the continuous casting mold apparatus 1 includes a pair of first mold members 10 and 10 facing each other and a pair of second mold members 20 and 20 facing each other in a rectangular shape (substantially in this embodiment). (Rectangle) combined with the mold. The continuous casting mold apparatus 1 includes a deformation mechanism 30 that changes the shape of the mold surface of at least one pair of first mold members 10 and 10.

  The first mold member 10 is a side mold member that forms a rectangular long side. The first mold member 10 is a long metal plate-like member extending in the long side direction. The pair of first mold members 10 and 10 are parallel to each other in a state before deformation. The first mold member 10 can be deformed such that the middle portion in the longitudinal direction swells outward.

  The 2nd casting_mold | template member 20 is an end surface casting_mold | template member which comprises a rectangular short side part. The second mold member 20 is made of a long metal plate-like member extending in the short side direction, is slightly curved and bulges outward. The second mold member 20 is disposed between the pair of first mold members 10, 10 and is provided so as to be movable in the longitudinal direction (long side direction) of the first mold member 10.

  The deformation mechanism 30 includes an actuator 31 and a drive source 32 that drives the actuator 31.

  A plurality of actuators 31 are provided for each first mold member 10. The actuator 31 is preferably provided in an odd number of three or more per one first mold member 10. In the present embodiment, three actuators 31 are provided for each first mold member 10, and the first mold member 10 is deformed by three-point drawing.

  The three actuators 31, 31, 31 are arranged along the longitudinal direction (long side direction) of the first mold member 10. Of the three actuators 31, 31, 31, the central actuator 31 is coupled to the middle portion in the long side direction of the first mold member 10. On the other hand, the actuators 31, 31 at both ends are coupled to positions separated from the coupling position of the central actuator 31 along the long side direction of the mold.

  As shown in FIG. 3, the actuator 31 includes a rack 33, a pinion 34, a casing 35, and a connecting member 36. The rack 33 extends in a direction (short side direction) orthogonal to the surface of the first mold member 10. The teeth 33a of the rack 33 are engaged with the teeth 34a of the pinion 34. As the pinion 34 rotates, the rack 33 moves in the short side direction of the mold. The pinion 34 is fixed to the distal end portion of the rotation shaft 32a of the drive means 32 described later.

  The casing 35 surrounds the rotating shaft 32 a and covers a connecting portion between the rack 33 and the pinion 34. An opening 35b is formed in the side wall 35a of the casing 35, and the rack 33 passes through the opening 35b. The opening 35b is formed in the side wall 35a facing the first mold member 10 and the opposite side wall 35a.

  The connecting member 36 is provided at one end (the first mold member 10 side end) of the rack 33. The connecting member 36 is made of a metal member having a U-shaped cross section. The opening end of the recess 36 a of the connecting member 36 faces the first mold member 10. The tip of the connecting plate 11 attached to the first mold member 10 is inserted into the recess 36a. The connecting plate 11 is welded to the side surface of the first mold member 10 and protrudes outward in the short side direction.

  Through holes 37 and 37 (see FIG. 3B) are formed in the upper plate portion and the lower plate portion of the connecting member 36, respectively. A through-hole 12 (see FIG. 3B) is formed in the connection plate 11. The through holes 37 and 11 have the same diameter, and are arranged coaxially in a state where the connection plate 11 is attached to the connection member 36. In the central actuator 31, upper and lower through holes 37 are formed at two positions with a gap in the long side direction of the mold. In the central connecting plate 11, the through holes 12 are formed in two places at intervals in the long side direction of the mold. In the actuator 31 at the end, upper and lower through holes 37 are formed at one central portion in the long side direction of the mold. In the connecting plate 11 at the end, the through hole 12 is formed at one central portion in the long side direction of the mold. A connecting pin 38 is inserted into the coaxial through holes 37, 12, 37 from above, and the connecting member 36 and the connecting plate 11 are fixed.

  As shown in FIGS. 1 and 2, three connection plates 11 are provided for one actuator 31. The three connecting plates 11 are arranged at predetermined intervals along the long side direction.

  As shown in FIGS. 1 to 3, the drive source 32 is provided for each actuator 31. That is, one drive source 32 is provided for each actuator 31. The drive source 32 is configured by an electric motor and is attached to a side portion of the casing 35. The rotating shaft 32 a of the electric motor is inserted into the casing 35 and reaches the upper position of the rack 33. A pinion 34 is fixed to the tip of the rotating shaft 32a.

  A control device (not shown) is connected to the drive source 32 so that the operation of each actuator 31 can be individually controlled. In the present embodiment, the central actuator 31 is independently controlled, and the actuators 31 and 31 at both ends are interlocked. That is, the operating amounts of the actuators 31 and 31 at both ends are the same, but the operating amount of the central actuator 31 can be different from the operating amounts of the actuators 31 and 31 at both ends. Therefore, for example, the deformation amount of the first mold member 10 can be increased at the central actuator 31, while the deformation amount of the first mold member 10 can be decreased by equalizing the deformation amount of the first mold member 10 at the actuators 31 at both ends. Note that the amount of deformation may be changed by independently controlling the actuators 31 at both ends.

  The actuator 31 and the drive source 32 configured as described above constitute one rack type electric linear jack. Three rack-type electric linear jacks are provided for each first mold member 10.

  Next, the effects of the present invention will be described while explaining the process of forming an ingot having a substantially rectangular cross section using the continuous casting mold apparatus 1.

  At the start of casting, first, as shown in FIG. 2, the first mold member 10 is deformed outward to make the mold shape a substantially drum shape. This is because the ingot is solidified and contracted when it is solidified, so that it is necessary to expand the mold rather than the shape of the ingot product. At this time, the central actuator 31 is independently controlled to increase its pulling length. On the other hand, the two actuators 31, 31 at both ends are interlocked and controlled to reduce the tensile length. The tensile lengths by the actuators 31 at both ends are equal. The tensile length by the central actuator 31 and the tensile length by the actuators 31 at both ends are appropriately determined according to various conditions such as the lengths of the long and short sides and the material of the ingot.

  According to the continuous casting mold apparatus 1 having the above-described configuration, the drive source 32 is provided for each actuator 31, and the central actuator 31 and the actuators 31, 31 at both ends can be controlled separately. The tensile length can be set finely.

  Furthermore, since three actuators 31 are provided for one first mold member 10, the deformation of the first mold member 10 can be finely controlled. Therefore, the curvature of the first mold member 10 can be set finely and can be deformed into a more optimal shape. Moreover, in the casting apparatus 1 for continuous casting, the actuator 31 is provided on the long side portion (first mold member 10) that is more susceptible to solidification shrinkage than the short side portion. In this way, since the curvature of the long side portion can be set finely, the influence of coagulation shrinkage can be suppressed.

  As described above, the inner surface (mold surface) of the first mold member 10 can be deformed into an optimal curved surface shape that is not a simple curved shape, depending on casting conditions. As a result, it is possible to reduce the surface shavings due to the surface machining of the surface layer portion, so that the product yield can be improved.

  If a plurality of continuous casting mold devices 1 are arranged and cast, it is possible to simultaneously cast slabs having different widths in the length direction of the long side surface (surface of the long side portion) of the cross-sectional shape. Furthermore, the flatness and dimensional accuracy of the long side surface (long side surface) of the slab can be improved. Furthermore, if the mechanism according to the present invention is combined with the mechanism of the variable width mold capable of changing the width in the length direction of the first mold member described in Japanese Patent Application Laid-Open No. 10-193043 filed earlier by the present applicant. It is possible to cast slabs having different widths in the length direction of the long side surfaces with good flatness.

  FIG. 4 shows the result of a three-point bending test using the continuous casting mold apparatus 1. This test is performed on the assumption that the mold size is 560 × 1310 mm. In the graph of FIG. 4, the horizontal axis indicates the long side dimension of the first mold member 10, and the vertical axis indicates the deformation amount. Moreover, the range of the profile of the existing slab mold as a provisional target is shown by a one-dot chain line and a broken line, and the deformation state of the first mold member 10 is shown by a solid line. In the drawing, three upward arrows indicate positions where the first mold member 10 is pulled by the actuator 31. As shown in the figure, according to the casting apparatus 1 for continuous casting, the first mold member 10 can be formed in a shape close to the target shape between the connecting positions of the actuators 31 at both ends.

  When casting starts, the lower mold lowering speed is gradually increased, and when the steady speed for continuous casting is reached, the lower mold lowering speed is kept constant. When gradually increasing the descending speed, the length of the tension by the actuator 31 is gradually reduced to gradually reduce the deformation amount of the first mold member 10. When the steady speed is reached, the movement of the actuator 31 is stopped, and the deformation amount (shape) of the first mold member 10 is kept constant.

  Even in the case where the amount of deformation is gradually reduced, according to the continuous casting mold apparatus 1, the tension length can be set finely for each actuator 31, so that the first mold member 10 is deformed into an optimal curved surface shape. Can do. As a result, it is possible to reduce the surface shavings due to the surface machining of the surface layer portion, so that the product yield can be improved.

  In the continuous casting mold apparatus 1 according to the present embodiment, since the three connection plates 11 are provided for one actuator 31, the mounting position of the actuator 31 on the first mold member 10 is the first. The mold member 10 is movable in the length direction. According to this, even when the length of the ingot is changed, the actuator 31 can be attached at an optimum position according to the length. Therefore, the first mold member 10 can be deformed into an optimum shape, and the deformation forms of the first mold member 10 can be diversified.

  As mentioned above, although the form for implementing this invention was demonstrated, this invention is not limited to the said embodiment, In the range which does not deviate from the meaning of this invention, a design change is possible suitably. For example, in the above-described embodiment, three actuators 31 are provided for one first mold member 10, but the present invention is not limited to this, and a larger number of actuators 31 may be provided. The number of actuators 31 is preferably an odd number. If the number of the actuators 31 is an odd number, the actuators 31 are attached to the middle portion in the longitudinal direction of the first mold member 10, so that the other actuators 31 can be arranged symmetrically with respect to the central actuator 31. In this way, the symmetrical actuators 31, 31 can be interlocked and controlled, so that the control becomes easy.

  In addition, the connection structure between the actuator 31 and the first mold member 10 of the embodiment is an example, and is not limited to the above configuration. For example, the connecting plate may be formed in a long shape extending in the long side direction, and a plurality of through holes into which pins are inserted may be provided. With such a configuration, a large number of attachment positions of the actuator 31 to the first mold member 10 can be set.

DESCRIPTION OF SYMBOLS 1 Mold apparatus for continuous casting 10 1st mold member 11 Connection plate 20 2nd mold member 30 Deformation mechanism 31 Actuator 32 Drive source 33 Rack 34 Pinion 36 Connection member

Claims (4)

In a continuous casting mold apparatus comprising a mold in which a pair of first mold members facing each other and a pair of second mold members facing each other are combined in a rectangular shape,
Comprising a deformation mechanism for changing the mold surface shape of at least one pair of the first mold members;
The said deformation | transformation mechanism is provided with the some actuator provided for every said 1st mold member, and the some drive source provided for every actuator. The casting apparatus for continuous casting characterized by the above-mentioned. The casting apparatus for continuous casting according to claim 1, wherein three or more actuators are provided for one of the first mold members. The first mold member is composed of a long metal plate-shaped member,
The casting apparatus for continuous casting according to claim 1 or 2, wherein a position where the actuator is attached to the first mold member is movable in a longitudinal direction of the first mold member. The first mold member is a side mold member that constitutes a long side part, and the second mold member is an end face mold member that constitutes a short side part. 2. A casting apparatus for continuous casting as set forth in claim 1.

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