JP2992675B2 - Semi-continuous casting equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a semi-continuous casting apparatus used for producing an aluminum ingot such as a slab for rolling and a billet for extrusion.

[0002] In this specification, the term "aluminum" shall include aluminum alloys in addition to pure aluminum.

[0003]

2. Description of the Related Art As a semi-continuous casting apparatus, a pair of brackets fixed to a casting gutter so as to protrude downward, and a float suspension attached to each bracket at right angles thereto. 2. Description of the Related Art There is known an apparatus provided with a lowering member and a float suspended by a float suspending member. Conventionally, in such a semi-continuous casting apparatus, a bolt attached to a bracket has been used as a float suspending member.

In such a semi-continuous casting apparatus, the molten metal is cooled and solidified by the mold and the bottom mold, and the float is usually floated on the molten metal guided into the mold through a spout. It works by adjusting and keeping the level of the molten metal surface in the mold constant. However, for some reason, the solidification of the molten metal proceeds to the portion of the float, and the float may be cast away (hereinafter, this phenomenon is referred to as "float removal"). In this case, if the diameter of the bolt serving as the suspending member is large,
Only the bottom mold is lowered, and the solidified metal is fixed to the float and suspended by the suspending member while being present in the mold. As a result, there is a problem that the process of removing the float and the solidified metal becomes troublesome.

Therefore, in order to solve such a problem, conventionally, the diameter of a bolt used as a suspension member has been set to about 3 mm. In this way, as described above, when "float removal" occurs, the bolt is bent downward due to the weight of the solidified metal, whereby the float is detached from the hanging member and the bottom mold is lowered together with the solidified metal with the lowering of the bottom mold. And descend. Therefore, it is only necessary to close the spout and stop the supply of the molten metal from the casting gutter, thereby simplifying the process of removing the float and the solidified metal.

However, when the diameter of the bolt used as the suspension member is set to about 3 mm, it has been found that the following problem occurs. That is, when the bolt is bent downward due to the weight of the solidified metal, the bolt is slightly plastically deformed and cannot return to the original state. And when the float is hung on the bolt bent in this way, the position of the float becomes a height position lower than a required position,
"Float removal" is likely to occur. Therefore, there is a problem that bending due to plastic deformation of the bolt is increased, and as a result, "float removal" is more likely to occur.

An object of the present invention is to provide a semi-continuous casting apparatus which solves the above-mentioned problems.

[0008]

SUMMARY OF THE INVENTION A semi-continuous casting apparatus according to the present invention comprises a pair of brackets fixed to a casting gutter so as to project downward, and a float suspension attached to each bracket at a right angle thereto. In a semi-continuous casting apparatus including a member and a float suspended by a float suspending member, the float suspending member is formed by winding a wire made of spring steel into a coil shape.

According to such a semi-continuous casting apparatus, the float suspending member is formed by winding a wire made of spring steel into a coil shape. The lowering member bends downward due to elastic deformation, whereby the float comes off the hanging member and descends together with the solidified metal with the lowering of the bottom mold. After the float comes off the suspending member, the float suspending member returns to its original state. And even if such an operation is repeated, the suspension member formed by winding the wire made of spring steel into a coil shape is unlikely to be plastically deformed. Can be prevented.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described.
This will be described with reference to the drawings.

In FIG. 1, a semi-continuous casting apparatus includes a casting gutter (1) connected to a molten metal holding furnace (not shown) and a casting gutter (1).
And a bottom mold (3) arranged below the mold (2) so as to be vertically movable. Casting gutter
A pouring spout (4) is provided on the portion of (1) facing the mold (2) so as to protrude downward. A float (5) having a molten metal flow hole (6) is arranged around the lower end of the pouring spout (4).

Pouring spout at the lower surface of the casting gutter (1)
Brackets (7) are fixed to both sides of (4) so as to protrude downward, and a float suspending member () protruding toward the pouring spout (4) at a right angle to each bracket (7). 8) is installed.

As shown in FIGS. 2 and 3, the float suspending member (8) is formed by tightly winding a wire (9) made of spring steel in a coil shape. And
The float hanging member (8) is passed through the horizontal through-hole (10) formed in each bracket (7), and forms a right angle with the horizontal through-hole (10) and one end faces the horizontal through-hole (10). It is fixed by a screw (12) screwed into the lateral screw hole (11). A screw having a butterfly head may be used as the fixing screw of the float hanging member (8). Float (5)
Is suspended by the float suspending member (8) by hooking the hook (13) fixed to the upper end of the hook to the float suspending member (8).

In such a configuration, when "float removal" occurs, as shown in FIG. 4, the float suspending member (8) is elastically deformed by the weight of the solidified metal (I) and bends downward. This releases the hook (13) of the float (5) from the suspension member (8). Then, as shown in FIG. 5, the float hanging member (8) is restored to the original state by the elastic force. On the other hand, the float (5)
It descends with the bottom mold (3) together with (I). Therefore, after closing the spout (4) and stopping the supply of molten metal from the casting gutter (1), the float (5) and the solidified metal (I) are
Remove from.

Even if such an operation is repeated, the suspension member (8) formed by winding the wire (9) made of spring steel into a coil shape is difficult to plastically deform. The occurrence rate of "taken" can be prevented from increasing.

With regard to the dimensions of the float suspending member (8), for example, when casting extruded aluminum billets having diameters of 6 inches, 7 inches and 8 inches, the diameter of the spring steel wire (9) should be 1.3 mm. When casting extruded aluminum billets having diameters of 12 inches, 15 inches and 17 inches, the diameter of the spring steel wire (9) is preferably 1.4 mm. In each case, the overall diameter of the float suspending member (8) was 6 mm,
The overall length is preferably 46 mm.

Next, specific experimental examples performed using the above semi-continuous casting apparatus will be described together with comparative examples.

As a float suspending member (8), a wire (9) made of spring steel having a diameter of 1.3 mm is wound in close contact with a coil so that the overall diameter is 6 mm and the overall length is 46 mm. Was used.

And 6 inches, 7 inches and 8 diameters.
An inch extruded aluminum billet was cast. As a result, the occurrence rate of "float removal" was 0.3% when casting an aluminum extruded billet having a diameter of 6 inches, and 0% when casting an aluminum extruded billet having a diameter of 7 inches and 8 inches.

For comparison, extruded aluminum billets with diameters of 6 inches, 7 inches and 8 inches were cast using float suspension members consisting of 3 mm diameter bolts. As a result, the occurrence rate of "float removal" is 1.5% when casting an aluminum extruded billet with a diameter of 6 inches, 0.7% when casting an aluminum extruded billet with a diameter of 7 inches, and extruding aluminum with an 8 inch diameter It was 0.8% when the billet was cast. .

[0021]

According to the semi-continuous casting apparatus of the present invention, as described above, when "float removal" occurs, the float suspending member is bent downward by elastic deformation, whereby the float is suspended. And falls with the solidification metal as the bottom die descends. Therefore, the process of removing the solidified metal and the float is simplified. Moreover,
After the float comes off the suspending member, the float suspending member returns to its original state. And, since the suspension member formed by winding a wire made of spring steel into a coil shape is not easily plastically deformed, even if the above operation is repeated, the occurrence rate of “float removal” increases. Can be prevented.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view showing a semi-continuous casting apparatus according to the present invention.

FIG. 2 is a partially enlarged view of FIG.

FIG. 3 is a sectional view taken along line III-III in FIG. 2;

FIG. 4 is a view corresponding to FIG. 1 showing a deformed state of the float hanging member when “float removal” occurs.

FIG. 5 is a view corresponding to FIG. 1 showing a state in which the float has come off the float suspending member after “float removal” has occurred.

[Explanation of symbols]

 (1) Casting gutter (7) Bracket (8) Float suspension member (9) Wire made of spring steel

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B22D 11/00 B22D 11/04

Claims (1)

(57) [Claims] 1. A pair of brackets fixed to a casting gutter so as to protrude downward, a float suspending member attached to each bracket at a right angle thereto, and a float suspended by the float suspending member. And a float suspending member formed by winding a wire made of spring steel into a coil shape.