JP5926161B2 - Pull-up type continuous casting apparatus and pull-up type continuous casting method - Google Patents

Description

  The present invention relates to an up-drawing continuous casting apparatus and an up-drawing continuous casting method.

  In Patent Document 1, the inventors have proposed a free casting method as an innovative continuous casting method that does not require a mold. As shown in Patent Document 1, after the starter is immersed in the surface of the molten metal (molten metal) (that is, the molten metal surface), when the starter is pulled up, the molten metal follows the starter by the surface film or surface tension of the molten metal. Derived. Here, a casting having a desired cross-sectional shape can be continuously cast by deriving and cooling the molten metal through a shape determining member installed in the vicinity of the molten metal surface.

In a normal continuous casting method, the shape in the longitudinal direction is defined along with the cross-sectional shape by the mold. In particular, in the continuous casting method, since the solidified metal (that is, the casting) needs to pass through the mold, the cast casting has a shape extending linearly in the longitudinal direction.
On the other hand, the shape defining member in the free casting method defines only the cross-sectional shape of the casting, and does not define the shape in the longitudinal direction. And since a shape prescription | regulation member can move to the direction (namely, horizontal direction) parallel to a molten metal surface, the casting in which the shape of a longitudinal direction is various is obtained. For example, Patent Document 1 discloses a hollow casting (that is, a pipe) that is formed in a zigzag shape or a spiral shape instead of being linear in the longitudinal direction.

JP 2012-61518 A

The inventor has found the following problems.
The free casting method described in Patent Document 1 can form a casting having a continuous shape by a shape defining member, but has a problem that it is difficult to form a casting having a discontinuous shape. Was. Even if the shape defining member is changed instantaneously, it is difficult to give a discontinuous shape to the retained molten metal before solidification.

  The present invention has been made in view of the above, and provides a pull-up-type continuous casting apparatus and a pull-up-type continuous casting method capable of forming a discontinuous shape on the surface of a casting to be continuously cast. With the goal.

The up-drawing continuous casting apparatus according to one aspect of the present invention is as follows.
A holding furnace for holding molten metal;
A lead-out member for deriving the molten metal from the surface of the molten metal held in the holding furnace;
A shape determining member that defines a cross-sectional shape of a casting to be cast by passing through the molten metal that is installed in the vicinity of the molten metal surface and is derived by the outlet member.
A cooling unit that cools the molten metal that has passed through the shape determining member;
And an impact applying section that applies an impact to the lead-out member or the casting. With such a configuration, a discontinuous shape can be formed on the surface of the casting to be cast.

It is preferable that the impact imparting portion impacts the lead-out member or the casting by striking the lead-out member or the casting with a metal rod.
Moreover, it is preferable that the said impact provision part moves along the movement path | route of the said derivation | leading-out member. Thereby, it is possible to give an impact to the lead-out member or the casting at any time during the progress of casting.

On the other hand, the impact applying member is preferably a vibrator. Thereby, a discontinuous shape can be formed on the surface of the casting to be cast, and the surface tension of the retained molten metal can be improved, so that a casting having a desired shape can be formed with higher accuracy.
Moreover, it is preferable that the said impact provision part contacts and is fixed to the said derivation | leading-out member. Thereby, it is possible to give an impact to the lead-out member at any time during the progress of casting.

The up-drawing continuous casting method according to one aspect of the present invention is as follows.
Deriving the molten metal by a deriving member and passing the shape defining member defining a cross-sectional shape of a casting to be cast; and
Cooling the molten metal that has passed through the shape defining member;
And applying a shock to the lead-out member or casting by means of an impact applying portion. With such a configuration, a discontinuous shape can be formed on the surface of the casting to be cast.

It is preferable that the lead-out member or the casting is impacted by hitting the lead-out member or the casting with a metal rod by the impact applying portion.
Moreover, it is preferable to move the said impact provision part along the movement path | route of the said derivation | leading-out member. Thereby, it is possible to give an impact to the lead-out member or the casting at any time during the progress of casting.

On the other hand, the impact applying unit is preferably a vibrator. Thereby, a discontinuous shape can be formed on the surface of the casting to be cast, and the surface tension of the retained molten metal can be improved, so that a casting having a desired shape can be formed with higher accuracy.
Moreover, it is preferable that the said impact provision part contacts and fixes the said derivation | leading-out member. Thereby, it is possible to give an impact to the lead-out member at any time during the progress of casting.

  According to the present invention, it is possible to provide an up-drawing continuous casting apparatus and an up-drawing continuous casting method capable of forming a discontinuous shape on the surface of a casting.

1 is a cross-sectional view of a free casting apparatus according to Embodiment 1. FIG. It is a top view of the internal shape defining member 102a and the external shape defining member 102b. FIG. 3 is a schematic diagram showing a casting forming process by the free casting apparatus according to the first embodiment. FIG. 3 is a schematic diagram showing a casting forming process by the free casting apparatus according to the first embodiment. FIG. 3 is a schematic diagram showing a casting forming process by the free casting apparatus according to the first embodiment. It is a figure which shows an example of the casting formed by the free casting apparatus which concerns on Embodiment 1. FIG. It is sectional drawing of the free casting apparatus which concerns on Embodiment 2. FIG.

  Hereinafter, specific embodiments to which the present invention is applied will be described in detail with reference to the drawings. However, the present invention is not limited to the following embodiment. In addition, for clarity of explanation, the following description and drawings are simplified as appropriate.

(Embodiment 1)
First, with reference to FIG. 1, the free casting apparatus (pull-up type continuous casting apparatus) according to Embodiment 1 will be described. 1 is a cross-sectional view of a free casting apparatus according to Embodiment 1. FIG. As shown in FIG. 1, the free casting apparatus according to Embodiment 1 includes a molten metal holding furnace 101, an internal shape defining member 102a, an external shape defining member 102b, support rods 103 and 104, an actuator 105, a cooling gas nozzle 106, and An impact applying unit 107 is provided.

  The molten metal holding furnace 101 accommodates a molten metal M1 such as aluminum or an alloy thereof and holds it at a predetermined temperature. In the example of FIG. 1, since the molten metal is not replenished to the molten metal holding furnace 101 during casting, the surface of the molten metal M1 (that is, the molten metal surface) decreases as the casting progresses. On the other hand, the molten metal may be replenished to the molten metal holding furnace 101 at any time during casting to keep the molten metal surface constant. As a matter of course, the molten metal M1 may be another metal or alloy other than aluminum.

  The internal shape defining member 102a and the external shape defining member 102b are made of, for example, ceramics or stainless steel, and are disposed in the vicinity of the molten metal surface. In the example of FIG. 1, the inner shape defining member 102a and the outer shape defining member 102b are arranged so as to contact the molten metal surface. However, the inner shape defining member 102a and the outer shape defining member 102b may be installed such that their main surfaces on the lower side (the hot water surface side) do not contact the hot water surface. Specifically, a predetermined gap (for example, about 0.5 mm) may be provided between the main surface on the lower side of the inner shape defining member 102a and the outer shape defining member 102b and the molten metal surface.

  The internal shape defining member 102a defines the internal shape of the casting M3 to be cast, and the external shape defining member 102b defines the external shape of the cast M3 to be cast. The casting M3 shown in FIG. 1 is a hollow casting (that is, a pipe) having a horizontal cross section (hereinafter referred to as a transverse section) having a tubular shape. Specifically, the inner shape defining member 102a defines the inner diameter of the cross section of the casting M3, and the outer shape defining member 102b defines the outer diameter of the cross section of the casting M3.

  FIG. 2 is a plan view of the inner shape defining member 102a and the outer shape defining member 102b. Here, the cross-sectional views of the internal shape determining member 102a and the external shape determining member 102b in FIG. 1 correspond to the II cross-sectional view in FIG. As shown in FIG. 2, the external shape defining member 102b has, for example, a rectangular planar shape, and has a circular opening at the center. The internal shape defining member 102a has a circular planar shape and is disposed at the center of the opening of the external shape defining member 102b. A gap between the inner shape determining member 102a and the outer shape determining member 102b becomes a molten metal passage portion 102c through which the molten metal passes. As described above, the shape defining member 102 includes the inner shape defining member 102a, the external shape defining member 102b, and the molten metal passage portion 102c.

  As shown in FIG. 1, the molten metal M1 is pulled up by the surface film or surface tension following the starter (leading member) ST or the casting M3, and passes through the molten metal passage portion 102c. Here, the molten metal pulled up from the molten metal surface following the starter ST or the casting M3 due to the surface film or surface tension of the molten metal is referred to as retained molten metal M2. Further, the interface between the casting M3 and the retained molten metal M2 is a solidification interface.

  The support rod 103 supports the internal shape defining member 102a, and the support rod 104 supports the external shape defining member 102b. The support rods 103 and 104 can maintain the positional relationship between the internal shape defining member 102a and the external shape defining member 102b. Here, if the support rod 103 has a pipe structure, a cooling gas is allowed to flow therethrough, and a blow hole is provided in the internal shape defining member 102a, the casting M3 can be cooled also from the inside.

  Both support rods 103 and 104 are connected to the actuator 105. By the actuator 105, the support rods 103 and 104 can move in the vertical direction (vertical direction) and the horizontal direction while maintaining the positional relationship between the internal shape defining member 102a and the external shape defining member 102b. With such a configuration, the inner shape defining member 102a and the outer shape defining member 102b can be moved downward as the molten metal surface is lowered due to the progress of casting. Further, since the inner shape defining member 102a and the outer shape defining member 102b can be moved in the horizontal direction, the shape of the casting M3 in the longitudinal direction can be freely changed.

  The cooling gas nozzle (cooling unit) 106 is for blowing a cooling gas (air, nitrogen, argon, etc.) on the starter ST or the casting M3 to cool it. While the starter ST and the casting M3 are cooled by the cooling gas while the casting M3 is pulled up by a pulling machine (not shown) connected to the starter ST, the retained molten metal M2 in the vicinity of the solidification interface is sequentially solidified to continuously cast the casting. M3 is formed.

  The impact applying unit 107 is a unit that applies an impact to the starter ST or the casting M3. The impact applying unit 107 applies an impact to the starter ST or the casting M3 by hitting the starter ST or the casting M3 with a metal rod, an air hammer, an electric hammer, or the like. The impact applied to the starter ST or the casting M3 by the impact applying unit 107 propagates through the casting M3. Thereby, a slight relative displacement momentarily occurs between the casting M3 and the retained molten metal M2 with the solidification interface as a boundary. As the retained molten metal M2 near the solidification interface where the instantaneous relative displacement has occurred solidifies, a casting M3 having a discontinuous shape on the surface is formed. More specifically, the casting M3 having a linear shape with a predetermined width (for example, a width of about 0.1 mm) is formed on the surface by solidifying the retained molten metal M2 near the solidification interface where instantaneous relative displacement has occurred. Is done. The discontinuous shape (line shape) formed on the surface of the casting M3 (so as to surround the outer periphery) is used as a ruled line for specifying the reference position of the casting M3, for example.

  The impact applying unit 107 is movable along the moving path of the starter ST. For example, the impact applying unit 107 can move upward as the starter ST rises due to a pulling-up operation of a pulling machine (not shown). Thereby, the impact applying unit 107 can apply an impact to the starter ST or the casting M3 at any time during the progress of casting.

  Further, the impact strength applied by the impact applying unit 107 to the starter ST or the casting M3 is only required to form a visible marking line on the surface of the casting M3, and at least affects the overall shape of the casting M3. It is necessary not to. The direction in which the impact is applied is most effective in the direction perpendicular to the pulling direction (horizontal direction), but may be parallel to the pulling direction or oblique to the pulling direction.

  Next, the free casting method according to Embodiment 1 will be described with reference to FIGS. 1, 3A, 3B, and 3C. 3A, FIG. 3B, and FIG. 3C are schematic diagrams showing the formation process of the casting M3 by the free casting apparatus shown in FIG. 1 in time series.

  First, the starter ST is lowered, and the tip of the starter ST is immersed in the molten metal M1 through the molten metal passage portion 102c between the internal shape defining member 102a and the external shape defining member 102b.

  Next, the starter ST is started to be pulled up at a predetermined speed. Here, even if the starter ST is separated from the molten metal surface, the molten metal M1 follows the starter ST and is pulled up (derived) from the molten metal surface to form the retained molten metal M2 (see FIG. 3A). As shown in FIG. 1, the retained molten metal M2 is formed in the molten metal passage portion 102c between the inner shape defining member 102a and the outer shape defining member 102b. That is, the shape is imparted to the retained molten metal M2 by the inner shape defining member 102a and the outer shape defining member 102b.

  Next, since the starter ST (and the casting M3) is cooled by the cooling gas blown from the cooling gas nozzle 106, the retained molten metal M2 is solidified in order from the upper side to the lower side, and the casting M3 grows. . In this way, the casting M3 can be continuously cast.

  Here, when the impact is applied to the starter ST or the casting M3 by the impact applying unit 107 during the casting, a slight relative displacement instantaneously occurs between the casting M3 and the retained molten metal M2 with the solidification interface as a boundary. Occurs (see FIG. 3B).

  And the casting M3 which has a discontinuous shape on the surface is formed when the holding | maintenance molten metal M2 of the solidification interface vicinity which the instantaneous relative displacement produced solidifies. For example, a ruled line K1 is formed as a discontinuous shape on the surface of the casting M3 (see FIG. 3C).

  FIG. 4 is a view showing an example of a casting M3 formed by the free casting apparatus shown in FIG. In the example of FIG. 4, a ruled line K1 is formed above the smoothly curved cylindrical casting M3, and a ruled line K2 is formed below. Thus, in the case of the casting M3 having no corners such as a cylindrical shape, the three directions (x, y, z directions) of the casting M3 are provided by providing a plurality of ruled lines K1, K2 on the surface of the casting M3. It becomes possible to specify the reference position.

  Thus, the free casting apparatus according to the present embodiment includes the impact applying unit 107 that applies an impact to the starter ST or the casting M3. Thereby, the free casting apparatus concerning this Embodiment can form a discontinuous shape (line shape) on the surface of the casting M3 continuously cast. This discontinuous shape formed on the surface of the casting M3 is used as a ruled line for specifying the reference position of the casting M3, for example. Thereby, working time can be shortened compared with the case where a ruled line is given to casting M3 in another process after casting.

  Note that the free casting apparatus according to the present embodiment applies an impact to the starter ST or the casting M3 instead of applying an impact to the shape defining member 102. Accordingly, it is possible to avoid the dimensional abnormality of the casting M3 and the mixing of foreign matters (oxides or the like) into the casting M3, which may occur due to the instantaneous fluctuation of the shape defining member 102. Further, the free casting apparatus according to the present embodiment applies an impact to the starter ST or the casting M3 by the impact applying unit 107 instead of applying an impact to the starter ST or the casting M3 by the pulling machine. Thereby, since a finer relative displacement can be generated between the casting M3 and the retained molten metal M2, the overall shape of the casting M3 can be prevented from being affected.

(Embodiment 2)
Next, a free casting apparatus according to Embodiment 2 will be described with reference to FIG. FIG. 5 is a cross-sectional view of the free casting apparatus according to the second embodiment. Compared with the free casting apparatus shown in FIG. 1, the free casting apparatus shown in FIG. The other configuration of the free casting apparatus shown in FIG. 5 is the same as that of the free casting apparatus shown in FIG.

  The vibrator 107a vibrates finely at a constant cycle, and thus impacts the starter ST finely at a constant cycle. Thereby, a discontinuous shape is finely formed at regular intervals on the surface of the casting M3. That is, a minute uneven shape is formed on the surface of the casting M3. Thereby, the designability and heat dissipation of the casting M3 to be cast can be improved.

  The vibrator 107a is movable along the moving path of the starter ST. For example, the vibrator 107a can move upward as the starter ST rises due to a pulling-up operation of a pulling machine (not shown). Alternatively, the vibrator 107a may be fixed in contact with the starter ST. Accordingly, the vibrator 107a can apply an impact (vibration) to the starter ST at any time during the progress of casting.

  As described above, the free casting apparatus according to the present embodiment includes the vibrator 107a that gives a fine impact to the starter ST at a constant period as an impact applying portion. Thereby, the free casting apparatus according to the present embodiment can form a discontinuous shape finely at regular intervals on the surface of the casting M3 to be continuously cast. Thereby, the free casting apparatus concerning this Embodiment can improve the designability and heat dissipation of the casting M3 to cast.

  Furthermore, the free casting apparatus according to the present embodiment can increase the surface tension of the retained molten metal M2 by vibrating the retained molten metal M2 by applying an impact to the starter ST at a constant period using the vibrator 107a. Thereby, the free casting apparatus according to the present embodiment has the shape of the transverse cross section of the retained molten metal M2 near the solidification interface (which has the shape of the transverse section of the casting M3) and the transverse of the retained molten metal M2 near the shape determining member 102. Since the difference between the shape of the surface can be reduced, the casting M3 having a desired shape can be formed with higher accuracy.

  Furthermore, in the free casting apparatus according to the present embodiment, the crystallized structure of the casting M3 to be cast is refined by vibrating the holding molten metal M2 by applying an impact to the starter ST at a certain period using the vibrator 107a. The destruction of the surface oxide film of the retained molten metal M2 can be promoted, or the bonding force between the starter ST and the molten metal M1 can be improved.

  Note that the present invention is not limited to the above-described embodiment, and can be changed as appropriate without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 101 Molten metal holding furnace 102 Shape defining member 102a Internal shape defining member 102b External shape defining member 102c Melt passage part 103, 104 Support rod 105 Actuator 106 Cooling gas nozzle 107 Impact applying part 107a Vibrator M1 Molten metal M2 Holding molten metal M3 Cast ST Starter

Claims (6)

A holding furnace for holding molten metal;
A lead-out member for deriving the molten metal from the surface of the molten metal held in the holding furnace;
A shape determining member that defines a cross-sectional shape of a casting to be cast by passing through the molten metal that is installed in the vicinity of the molten metal surface and is derived by the outlet member.
A cooling unit that cools the molten metal that has passed through the shape determining member;
An uplift-type continuous casting apparatus provided with an impact applying portion that applies an impact to the lead-out member or the casting ,
The pulling-up-type continuous casting apparatus , wherein the impact applying portion moves along a movement path of the lead-out member .   The pulling-up-type continuous casting apparatus according to claim 1, wherein the impact applying unit impacts the lead-out member or the casting by hitting the lead-out member or the casting with a metal rod. A holding furnace for holding molten metal;
A lead-out member for deriving the molten metal from the surface of the molten metal held in the holding furnace;
A shape determining member that defines a cross-sectional shape of a casting to be cast by passing through the molten metal that is installed in the vicinity of the molten metal surface and is derived by the outlet member.
A cooling unit that cools the molten metal that has passed through the shape determining member;
An uplift-type continuous casting apparatus provided with an impact applying portion that applies an impact to the lead-out member or the casting ,
The pulling-up-type continuous casting apparatus , wherein the impact applying unit is a vibrator and is fixed in contact with the lead-out member . Derive the Ri溶 water by the leading member, comprising the steps of passing a shape defining member for defining the casting cross-sectional shape of casting,
Cooling the molten metal that has passed through the shape defining member;
A step of applying an impact to the lead-out member or the casting by an impact applying portion, and a pulling-up-type continuous casting method comprising :
The pulling-up-type continuous casting method , wherein the impact applying portion is moved along a moving path of the lead-out member . The pulling-up-type continuous casting method according to claim 4 , wherein an impact is applied to the lead-out member or the casting by hitting the lead-out member or the casting with a metal rod by the impact applying portion. Derive the Ri溶 water by the leading member, comprising the steps of passing a shape defining member for defining the casting cross-sectional shape of casting,
Cooling the molten metal that has passed through the shape defining member;
A step of applying an impact to the lead-out member or the casting by an impact applying portion, and a pulling-up-type continuous casting method comprising :
The impact applying unit is a vibrator,
A pulling-up-type continuous casting method in which the impact applying portion is fixed in contact with the lead-out member .

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