JP2021065910A - Casting apparatus - Google Patents

Abstract

To provide a casting apparatus capable of effectively and independently controlling primary and secondary cooling conditions with a simple structure.SOLUTION: A casting apparatus A comprises: a bottom body 1 vertically movable and fixable to an arbitrary vertical position; a cast 3 which includes a peripheral wall 2 installed around the bottom body and having a circulation path formed therein for circulating a cooling medium 7; and a molten metal supply part 4 which is installed above the cast 3 and which supplies molten metal 5 into the cast 3. The casting apparatus A lowers the bottom body 1 while supplying the molten metal 5 into the case 3 by the molten metal supply part 4, primarily cools the molten metal 5 by the bottom body 1 and the peripheral wall 2, and secondarily cools the molten metal by the cooling medium 7 injected from a plurality of injection holes 15 provided around the peripheral wall 2 to form an ingot, and is configured such that a sub-flow path 16 which enables adjustment of the flow rate of the cooling medium 7 injected from the injection holes 15 of the peripheral wall 2 for secondary cooling is provided at a part of a flow path 8 for circulating the cooling medium 7.SELECTED DRAWING: Figure 1

Description

The present invention relates to a casting apparatus suitable for use when a metal such as aluminum is used as an ingot such as a billet type or a slab type.

Conventionally, for example, aluminum ingots such as slab type and billet type are manufactured by a semi-continuous casting method called a so-called DC casting method (Direct Chill Casting Process).
FIG. 4 is a schematic cross-sectional view showing an example of a casting apparatus for producing an aluminum ingot by a DC casting method. In the casting apparatus 100 shown in FIG. 4, 101 is movable in the vertical direction and up and down by an elevating device such as a hydraulic cylinder. The bottom block (bottom body) that can be fixed at an arbitrary position in the direction is shown.
A water-cooled jacket mold (peripheral wall portion) 102 for cooling is provided around the bottom block 101, and the mold 103 is composed of the bottom block 101 and the water-cooled jacket mold 102.

Above the mold 103, a trough (molten metal supply unit) 104 for supplying the molten aluminum 105 is provided in the mold 103. A recess 106 for storing the molten aluminum 105 is formed in the upper part of the bottom block 101.
The water-cooled jacket mold 102 is formed with a flow path 108 having a substantially rectangular cross section for circulating cooling water (cooling medium) 107, and the flow path 108 is a rectifying plate having holes 111 or slits for communication formed in the upper portion. It is divided into an outer flow path 113 and an inner flow path 114 by 112. Further, a plurality of injection holes 115 for injecting the cooling water 107 are formed at the lower end portion of the inner flow path 114 on the bottom block 101 side at predetermined intervals. Further, the float 116 is suspended on the liquid surface of the molten aluminum 105 around the trough 104.

In order to produce an aluminum ingot using the casting apparatus shown in FIG. 4, the molten aluminum 105 transferred from a holding furnace (not shown) is temporarily stored in the trough 104, and the molten aluminum 105 is poured into the mold 103 to pour the bottom block. The solidified shell 105a is formed around the molten aluminum 105 by primary cooling with the 101 and the water-cooled jacket mold 102 as shown in FIG.
Next, the solidified shell 105a is stretched downward by lowering the bottom block 101 so that the liquid level of the molten aluminum 105 in the mold 103 becomes a constant height while supplying the molten aluminum 105 into the mold 103. Further, cooling water 107 is injected from the injection hole 115 to secondary cool the solidified shell 105a to form a slab type or billet type aluminum ingot 117.

In the casting apparatus 100 shown in FIG. 4, the temperature distribution of the cooling water 107 can be made uniform while the cooling water 107 circulates in the inner flow path 114 of the water-cooled jacket mold 102. Therefore, the periphery of the molten aluminum 105 and the obtained solidified shell 105a can be uniformly cooled, and the temperature distribution on the surface of the solidified shell 105a can be made uniform.
Therefore, according to the casting apparatus 100 shown in FIG. 4, it is possible to manufacture an aluminum ingot 117 having a dense metal structure and excellent mechanical properties and durability, and the floor area required for installation is small. It has excellent features such as excellent mass productivity.

By the way, in the conventional casting apparatus 100 shown in FIG. 4, there is a problem that iron rust contained in the cooling water 107 causes clogging in the communication hole 111 and the injection hole 115 of the straightening vane. When the communication hole 111 is clogged, there may be a place where the cooling water 107 cannot be supplied from the outer flow path 113 to the inner flow path 114. If the flow rate of the cooling water 107 injected from the injection hole 115 changes depending on the location, the solidified shell 105a cannot be cooled uniformly.
Further, when the injection hole 115 is clogged, the solidified shell 105a may not be secondarily cooled, so that the entire solidified shell 105a cannot be uniformly secondarily cooled, and the metal structure is uniform aluminum. The ingot 117 cannot be manufactured.

Against this background, the applicant of the present application first arranged magnets in the outer flow path 113 and the inner flow path 114 of the water-cooled jacket mold 102 for the purpose of removing iron rust in the cooling water, and magnetized the iron rust. A patent application has been filed for a casting apparatus configured to be able to capture in (see Patent Document 1).

Japanese Unexamined Patent Publication No. 8-10921

The previous patent application was able to solve the problem of iron rust in casting equipment, but when examining this type of casting equipment, it is not possible to control primary cooling and secondary cooling individually under favorable conditions. It turned out to have a problem.
When semi-continuous casting of an aluminum alloy is performed by the casting apparatus 100 shown in FIG. 4, primary cooling is performed by heat conduction of the inner peripheral wall of the water-cooled jacket mold 102, and secondary cooling is performed by water cooling treatment by cooling water 107 injected from the injection hole 115. Is done.
The control of the cooling conditions in the primary cooling and the secondary cooling is generally performed by controlling the flow rate of the cooling water 107.

However, although it is conceivable that the optimum flow rate for primary cooling and the optimum flow rate for secondary cooling may differ, the casting apparatus 100 shown in FIG. 4 does not have a structure in which each is independently controlled. For example, when the flow rate is set to the optimum level for the primary cooling, the amount of water in the secondary cooling becomes excessive, the cooling rate becomes excessive, and casting cracks may occur. On the contrary, when the optimum flow rate for the secondary cooling is set, the amount of water for the primary cooling becomes too small, and the solidified shell becomes too small, which may cause poor casting surface.
A mold structure in which the primary cooling system and the secondary cooling system are separated and cooling water is supplied by separate systems has also been proposed, but the structure becomes complicated, the mold cost increases, and the maintenance of the mold becomes complicated. There is a problem that becomes.

The present invention has been made in view of the above background, and an object of the present invention is to provide a casting apparatus capable of independently controlling the conditions of primary cooling and secondary cooling effectively with a simple structure.

(1) In the casting apparatus according to the present invention, a bottom body that is movable in the vertical direction and can be fixed at an arbitrary position in the vertical direction and a circulation path that is provided around the bottom body and circulates a cooling medium are formed inside. The bottom portion is provided with a mold composed of a peripheral wall portion and a molten metal supply unit provided above the mold and supplying the molten metal into the mold, and supplying the molten metal into the mold from the molten metal supply unit. The body is lowered, and the molten metal is primarily cooled by the bottom body and the peripheral wall portion, and further secondarily cooled by a cooling medium injected from a plurality of injection holes provided around the peripheral wall portion to form an ingot. It is a casting apparatus, and the flow rate of the cooling medium for secondary cooling injected from the injection hole of the peripheral wall portion is adjustable in the vicinity of the injection hole, which is a part of the flow path for circulating the cooling medium. It is characterized by providing an auxiliary flow path.

(2) In the casting apparatus according to the present invention, a configuration in which a flow rate adjusting valve is provided in the sub-flow path can be adopted.
(3) In the casting apparatus according to the present invention, the injection hole is formed at a position adjacent to the molten metal supply portion on the inner bottom side of the peripheral wall portion, and the sub-flow path is the injection hole in the peripheral wall portion. It is possible to adopt a configuration in which the structure is arranged closer to the outside than the formation position of.

(4) In the casting apparatus according to the present invention, the circulation path is partitioned into an inner flow path on the side close to the molten metal supply section and an outer flow path on the side away from the molten metal supply section by a straightening vane partitioning the inside thereof. A communication portion connecting the inner flow path and the outer flow path is formed on the upper side of the rectifying plate, and a discharge port of the sub-flow path is provided between the bottom of the rectifying plate and the injection hole in the circulation path. The formed configuration can be adopted.

Casting is performed by primary cooling the metal molten metal supplied to the molten metal supply unit by a peripheral wall portion provided around the molten metal supply unit, and secondary cooling the metal molten metal by a cooling medium ejected from an injection hole provided in the peripheral wall portion. Since the sub-flow path is provided in the vicinity of the injection hole in the casting apparatus to be performed, the flow rate of the cooling medium that can be discharged from the injection hole can be adjusted according to the cooling medium that is discharged through the sub-flow path.
Therefore, both the primary cooling by the peripheral wall portion by adjusting the amount of the cooling medium supplied to the circulation path and the secondary cooling by adjusting the discharge amount of the cooling medium discharged from the injection hole are independent with a simple configuration. A template that can be changed to can be provided.
Therefore, it is possible to provide a casting apparatus capable of producing an ingot having no defective casting surface without causing a casting crack in spite of having a simple structure.

It is sectional drawing which shows the casting apparatus of 1st Embodiment which concerns on this invention. It is explanatory drawing which shows the state which performs the primary cooling which forms a solidified shell by the casting apparatus shown in FIG. 1, and the secondary cooling which directly cools by cooling water. It is sectional drawing which shows the drainage pipe provided connected to the inner flow path in the same casting apparatus. It is sectional drawing which shows an example of the conventional casting apparatus. It is sectional drawing which shows the state which performs the primary cooling and the secondary cooling by using the conventional casting apparatus.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
In addition, in the drawing used in the following description, in order to make the feature easy to understand, the feature portion may be enlarged and shown for convenience.
FIG. 1 shows the casting apparatus A of the first embodiment according to the present invention, and the basic structure of the casting apparatus A of this embodiment is the same as that of the conventional casting apparatus described with reference to FIG.
In FIG. 1, 1 is a bottom block (bottom body), 2 is a water-cooled jacket mold (peripheral wall portion) for cooling, and the mold 3 is composed of the bottom block 1 and the water-cooled jacket mold 2. Reference numeral 4 denotes a trough (molten metal supply unit) for supplying the molten aluminum 5.

A recess 1a for storing 5 molten aluminum is formed in the upper part of the bottom block 1. The water-cooled jacket mold 2 is formed in an annular shape surrounding the outer periphery of the bottom block 1, and the water-cooled jacket mold 2 is formed of a hollow annular body composed of an inner peripheral wall 2A, an outer peripheral wall 2B, a bottom wall 2C, and a ceiling wall 2D. There is.
A flow path 8 having a substantially rectangular cross section for circulating cooling water (cooling medium) 7 is formed in the hollow portion of the water-cooled jacket mold 2, and the flow path 8 has a communication hole 11 such as a slit or an intermittent hole at the upper portion. The rectifying plate 12 is divided into an outer flow path 13 and an inner flow path 14. In the structure of FIG. 1, the straightening vane 12 is erected so as to rise vertically upward from the upper surface of the bottom wall at an intermediate position between the inner peripheral wall 2A and the outer peripheral wall 2B. Since the straightening vane 12 is formed over the entire circumference of the water-cooled jacket mold 2, the flow path 8 is divided into an outer flow path 13 and an inner flow path 14 over the entire circumference of the water-cooled jacket mold 2.

In the structure of FIG. 1, the straightening vane 12 is erected from the bottom to the top of the flow path 8 at a position slightly closer to the inner peripheral wall than the intermediate position between the inner peripheral wall 2A and the outer peripheral wall 2B. The communication hole 11 is formed on the upper side of the flow path 8 over substantially the entire circumference of the flow path 8. Therefore, when the cooling water 7 is accommodated in the flow path 8 and the cooling water 7 is circulated, the cooling water 7 is filled in both the outer flow path 13 and the inner flow path 14 as shown in FIG. 7 is circulated.
Although not drawn in FIG. 1, a water supply pipe (cooling medium supply pipe) is connected to a part of the water-cooled jacket mold 2 to supply water (cooling medium) to the flow path 8 so that the flow rate becomes constant. ..

In the water-cooled jacket mold 2, a plurality of injection holes 15 for ejecting cooling water 7 are provided around the water-cooled jacket mold 2 at predetermined intervals at a portion where the bottom portion of the inner peripheral wall 2A and the inner peripheral portion of the bottom wall 2C are connected. It is formed. The float 6 is suspended on the liquid surface of the molten aluminum 5 around the trough 4.

Further, a drain pipe (secondary flow path) 16 is connected so as to vertically penetrate the bottom wall 2C between the formation position of the injection hole 15 and the bottom of the straightening vane 12, and the flow rate adjusting valve 16a is incorporated in the drain pipe 16. ing. The upper end of the drain pipe 16 penetrates the bottom wall 2C and communicates with the inner flow path 14, and the lower end of the drain pipe 16 is open to the space below the water-cooled jacket mold 2.
In FIG. 1, the lower end of the drainage pipe 16 is drawn in a state of being stopped in the space below the water-cooled jacket mold 2. However, a separate drainage facility or the like is provided below the water-cooled jacket mold 2, and the drainage pipe 16 is provided in this drainage facility. It is preferable that the lower end is connected to discharge the cooling water 7.

In the structure shown in FIG. 1, a plurality of injection holes 15 are formed around the water-cooled jacket mold 2 at predetermined intervals, and a plurality of injection holes 15 are formed around the water-cooled jacket mold 2 at predetermined intervals. A drain pipe 16 is provided.
Further, water is supplied to the water-cooled jacket mold 2 from a water supply pipe (not shown) so that the amount of water supplied is constant, and since the drain pipe 16 is provided with the flow rate adjusting valve 16a, the open / closed state of the flow rate adjusting valve 16a is adjusted. By adjusting the amount of drainage through the drainage pipe 16, the amount of water discharged from the injection hole 15 can be adjusted. For example, the amount of water discharged from the injection hole 15 can be reduced in proportion to the increase in the amount of water discharged from the drain pipe 16. Therefore, the drain pipe 16 functions as a secondary flow path of the cooling water 7.
The position where the upper end of the drainage pipe 16 drawn in the embodiment shown in FIG. 1 is connected to the inner flow path 14 is the bottom wall 2C near the installation position of the injection hole 15, but the drainage pipe 16 The forming position is not limited to the position shown in the figure, and may be any position as long as it is on the bottom side of the inner flow path 14 of the water-cooled jacket mold 2.

In order to produce an aluminum ingot using the casting apparatus A shown in FIG. 1, the molten aluminum 5 transferred from a holding furnace (not shown) is temporarily stored in the trough 4, and the molten aluminum 5 is poured into the mold 3 to bottom. The block 1 and the water-cooled jacket mold 2 are used for primary cooling to solidify, and a solidified shell 5a is formed around the molten aluminum 5.
Next, the solidified shell 5a is stretched downward by gradually lowering the bottom block 1 so that the liquid level of the molten aluminum 5 in the mold 3 becomes a constant height while supplying the molten aluminum 5 into the mold 3. Further, cooling water 7 is injected from the injection hole 15 to secondary cool the solidified shell 5a to form a slab type or billet type aluminum ingot 17.

In this casting apparatus A, the temperature distribution becomes uniform while the cooling water 7 circulates in the inner flow path 14, and the periphery of the molten aluminum 5 and the obtained solidified shell 5a can be uniformly primaryly cooled. The temperature distribution on the surface of the ingot shell 5a can be made uniform. Therefore, it is possible to obtain an aluminum ingot 17 having a dense metal structure and excellent mechanical properties and durability. Moreover, the casting apparatus A has excellent features such as a small floor area required for installation and excellent mass productivity.

In the casting apparatus A, by adjusting the flow rate adjusting valves 16a incorporated in the plurality of drain pipes 16, the amount of the cooling water 7 discharged through the plurality of drain pipes 16 can be adjusted, and at the same time, the amount of the cooling water 7 discharged from the plurality of injection holes 15 can be adjusted. The amount of cooling water to be injected can also be adjusted. The solidified shell 5a can be secondarily cooled with a predetermined amount of cooling water 7 injected from the plurality of injection holes 15.
When the flow rate adjusting valve 16a is adjusted and the cooling water 7 is discharged through the drain pipe 16 in addition to the injection of the cooling water from the plurality of injection holes 15, the solidified shell 5a is discharged from the plurality of injection holes 15 according to the discharge amount. The amount of cooling water jetted for secondary cooling can be reduced.
Therefore, the amount of cooling water discharged from the injection hole 15 for secondary cooling of the solidified shell 5a can be adjusted according to the amount of cooling water discharged from the drain pipe 16, thereby adjusting the degree of secondary cooling. it can.

As described above, the casting apparatus A of the present embodiment can control both the primary cooling and the secondary cooling individually by a simple configuration. Therefore, the desired primary cooling conditions are matched to the aluminum alloy to be cast. And preferable secondary cooling conditions can be set individually and used properly.
Therefore, by optimizing the conditions for secondary cooling, it is possible to manufacture ingots without causing ingot cracking, and by optimizing the conditions for primary cooling, it is possible to manufacture ingots without causing problems such as poor casting surface. Become.
Therefore, according to the present invention, it is possible to provide a casting apparatus A having a good casting surface and capable of producing an ingot without causing ingot cracking at low cost.
In the casting apparatus A, the installation positions and the number of drainage pipes 16 formed around the water-cooled jacket mold 2 are set at predetermined intervals around the circumference in order to keep the amount of cooling water injected from each injection hole 15 as constant as possible. It is preferable to provide the required number.
Further, it is preferable that the required number of injection holes 15 are formed at desirable positions around the circumference of the water-cooled jacket mold 2 in order to cool the solidified shell 5a as uniformly as possible.

A ... Casting equipment, 1 ... Bottom block (bottom body), 2 ... Water-cooled jacket mold (peripheral wall), 2A ... Inner peripheral wall, 2B ... Outer wall, 2C ... Bottom wall, 2D ... Ceiling wall, 3 ... Mold, 4 ... Traf (molten metal supply unit), 5 ... Aluminum molten metal, 5a ... solidified shell, 7 ... cooling water (cooling medium), 8 ... flow path, 11 ... communication hole, 12 ... rectifying plate, 13 ... outer flow path, 14 ... inner flow Road, 15 ... injection hole, 16 ... drain pipe (secondary flow path), 16a ... flow control valve.

Claims (4)

A mold consisting of a bottom body that is movable in the vertical direction and can be fixed at an arbitrary position in the vertical direction, a peripheral wall portion that is provided around the bottom body and has a circulation path for circulating a cooling medium inside, and the mold. It is provided above the mold and is provided with a molten metal supply unit for supplying the molten metal in the mold.
A plurality of injections provided around the peripheral wall portion while supplying the molten metal into the mold from the molten metal supply unit to lower the bottom body and primary cooling the molten metal by the bottom body and the peripheral wall portion. A casting device that is further secondary cooled by a cooling medium jetted from a hole to form an ingot.
A sub-flow path is provided in the vicinity of the injection hole, which is a part of the flow path for circulating the cooling medium, so that the flow rate of the cooling medium for secondary cooling injected from the injection hole of the peripheral wall portion can be adjusted. A casting machine characterized by that. The casting apparatus according to claim 1, wherein a flow rate adjusting valve is provided in the sub-flow path. The injection hole is formed on the inner bottom side of the peripheral wall portion and adjacent to the molten metal supply portion, and the sub-flow path is arranged closer to the outside than the formation position of the injection hole on the peripheral wall portion. The casting apparatus according to claim 1 or 2, wherein the casting apparatus is characterized in that. The circulation path is partitioned into an inner flow path on the side close to the molten metal supply section and an outer flow path on the side away from the molten metal supply section by a rectifying plate that partitions the inside thereof, and the inner flow path is on the upper side of the rectifying plate. 1. A communication hole connecting the outer flow path and the outer flow path is formed, and a discharge port of the sub-flow path is formed between the bottom of the straightening vane and the injection hole in the circulation path. The casting apparatus according to any one of claims 3.

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