JP2602397Y2 - Billet 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 billet casting apparatus used for producing billets of aluminum and other metals.

[0002]

2. Description of the Related Art Conventionally, as a billet casting apparatus, DC has been used.
A casting apparatus as shown in FIG. 3 employing a casting method (Direct Chill Casting Process) is known.

In the figure, 1 is a mold, 2 is a trough,
3 is a spout, 4 is a float, 5 is a bottom block that is controlled to descend in the direction of arrow 6, and 7 is a plug.

The molten metal guided from the holding furnace to the trough 2 flows through the spout 3 to the float 4, and the molten metal flowing out of the float 4 solidifies in the mold 1, so that the bottom block 5 is controlled to descend at a predetermined speed. In this way, a billet is cast.

[0005]

In the casting apparatus as described above, the flow rate of the molten metal flowing from the spout 3 to the float 4 is limited by the gap distance between the tip surface of the spout 3 and the bottom surface of the float 4, and in a steady state. The flow pressure of the molten metal applied to the float 4 and the buoyancy and the tension of the spring 8 acting on the float 4 from the molten metal on the bottom block 5 are balanced.
The gap distance is set to an appropriate distance (1-2 mm).

However, at the beginning of casting, at the beginning of the flow of the molten metal, when the plug 7 that has blocked the spout 3 is removed, the molten metal flows out at once, and buoyancy still acts on the float. No, spout 3
And the gap distance between the float 4 becomes larger than the steady state (3.
４4 mm), and there is a problem that the flow rate of the molten metal flows at a flow rate that is two to three times that of the steady state. When the flow rate of the molten metal is increased, the molten metal overflows from the float 4, causing turbulence in the flow of the molten metal, forming defects in the billet due to generation of an oxide film and entrainment of air. It was something that had become.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a billet casting apparatus capable of stably limiting the flow rate of a molten metal.

The billet casting apparatus of the present invention which achieves the above object is a billet casting apparatus in which a trough for guiding a molten metal is installed on the upper side of a mold, and a spout and a float facing the spout are installed on the bottom of the trough. A spout opening formed at the bottom of the trough,
An opening / closing plug is provided so as to be able to be freely attached and detached, and a control pin inserted into the spout is connected to the opening / closing plug .
A billet casting apparatus characterized in that the diameter of the control pin is 0.3 to 0.5 times the diameter and the length of the control pin is at least half the length of the spout.

The diameter of the control pin is about 0.3 to 0.5 φ, where φ is the inner diameter of the spout. 0.3
If it is less than φ, it is not enough to control the rapid flow of the molten metal at the start of casting, and if it exceeds 0.5 φ, the molten metal may be solidified in the spout, which is inappropriate. . The length of the control pin is about 0.5 L to 1 L, where L is the total length of the spout.

[0010]

In the billet casting apparatus of the present invention, when the opening / closing plug is moved in a direction away from the spout opening,
The molten metal in the trough flows to the float side through the spout, but the control pin connected to the open / close plug
Restrict the flow rate of the molten metal flowing through the spout. As a result, rapid flow at the start of casting can be eliminated.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a billet casting apparatus according to an embodiment, in which a trough 12 is provided above a mold 11 and a spout 13 is continuously provided at the bottom of the trough 12. The spout 13 has a lower end side inserted into the mold 11 and a float 14 installed so as to face the lower end surface of the spout 13. The float 14 is connected to the bottom surface of the trough 12. Are suspended through the coil springs 15, 15. A bottom block 16 is provided at a lower portion inside the mold 11 so as to be controlled to descend in the direction of arrow 17.

Inside the trough 12 is a spout opening 1.
An opening / closing plug 19 is provided for 8, and a control pin 20 connected to the opening / closing plug 19 is inserted into the spout 13.

FIG. 2 is a schematic plan view of the trough 12 (a).
And a diagram schematically showing a support device 21 of the opening / closing plug 19
(b). The spouts 13 are provided so as to face each of several molds 11, and the open / close plugs 19 installed on each spout 13 share a common support bar 22.
It has come to support. The rod 23 fixed to the support bar 22 is inserted through the support post 24, and the support post 2
The stopper 28 is held by a spring 25 mounted in the inside 4, and a stopper 28 can be fitted into a hole 26 opened in the side wall of the rod 23 through a hole 27 opened in the side wall of the support post 24.

When the stopper 28 is fitted, the spring 25 is compressed against the elasticity, and
Plug part 1 of opening / closing plug 19 supported by support bar 22
9a is a positional relationship for closing the spout opening 18 of the trough 12, and when the stopper 28 is removed, the opening and closing plug 1 is opened via the support bar 22 by the elasticity of the spring 25.
9 is lifted to open the spout 13, and the control pin 20 is supported at a predetermined position in the spout 13.

In the billet casting apparatus of the above embodiment,
When the stopper 28 is removed from the support post 24 in order to start the billet casting, the spout opening at the bottom of the trough 11 is opened, and the molten metal in the trough 11 flows out toward the float 14 through the spout 13. At this time, since the flow of the molten metal is controlled in a state where the control pin 20 is inserted into the spout 13, a rapid outflow of the molten metal is prevented.
Can be prevented from overflowing and flowing. .

The lowering of the bottom block 16 is started when a predetermined amount of molten metal has accumulated in the bottom block 16. As the bottom block 16 descends, billets are manufactured. When the flow of the molten metal becomes stable (when a predetermined buoyancy acts on the float 14), the opening / closing plug 19 held by the spring 25 is pulled up together with the support bar 22 and removed from the trough 12. To do.

The inner diameter of the spout 13 is determined according to the size of the billet to be manufactured (10 to 15 mm).
The outer diameter of the control pin 20 is
About 0.3 to 0.5 of the inner diameter of. The length of the control pin need not be the same as the length of the spout 13, but if it is too short, the effect of restricting the flow of the molten metal is lost.

[0019]

As it has been described above devised] According to this invention, by inserting the control pin within the spout, since to control the flow of molten metal, without a sudden outflow at the start of casting, metal At the beginning of the flow,
Molten metal overflows from the float
Turbulence of the molten metal flow
Prevents oxide film formation and air entrapment in the billet
As a result , there is an effect that a billet having no defect can be cast.

[Brief description of the drawings]

FIG. 1 is a sectional view of an embodiment of the present invention.

2 (a) is a schematic plan view of a trough according to an embodiment of the present invention, and FIG. 2 (b) is a schematic view of a device for supporting an opening / closing plug according to the embodiment.

FIG. 3 is a sectional view of a conventional billet casting apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Mold 12 Trough 13 Spout 14 Float 16 Bottom block 18 Spout opening 19 Opening / closing plug 19a Plug part 20 Control pin 21 Support device 22 Support bar 23 Rod 24 Support post 25 Spring 28 Stopper

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B22D 11/04

Claims (1)

(57) [Scope of request for utility model registration] 1. A billet manufacturing apparatus in which a trough for guiding a molten metal is installed above a mold, and a spout and a float facing the spout are installed at the bottom of the trough. A spout opening formed at the bottom of the trough. An opening / closing plug is installed in the part so as to be able to be freely attached and detached, a control pin inserted into the spout is connected to the opening / closing plug, and the outer diameter of the control pin is
A billet casting apparatus characterized in that the inside diameter is 0.3 to 0.5 times and the length of the control pin is one half or more of the length of the spout.