JPS613823A - Worked aluminum article for deoxidation and producing device thereof - Google Patents

Abstract

PURPOSE:To provide a worked Al article which has a high deoxidizing effect of a molten steel and is easily produceable by cutting the Al material which is cooled to solidify to a bar shape to a fixed length so that cut surfaces are formed to part of the outside surface of the Al material obtd. by such cutting. CONSTITUTION:The worked Al article 5 is formed by cutting the bar-shaped Al material having a specified section (a trapezoidal shape having a smooth outside surface in this embodiment) at a specified interval to a shape body having the cut faces 5a without being coated with alumina layers at both ends. Such article 5 is obtd. by moving first a casting mold path 6, which is movable at a constant speed, at a constant speed when the pure Al melted in a crucible 1 is in a prescribed melting temp. region. The stopper bar 12 of the crucible 10 is then lifted to drop the molten Al into a sprue 11 and to feed continuously the molten Al at a constant rate through a pouring port 11a onto the casting mold 9 at the beginning end of the path 6. The molten Al is solidified by natural cooling to some extent while said Al elongates into a bar shape toward the traveling direction according to the progression of the mold 9 and is thoroughly cooled and solidified when the molten Al submerges in the next cooling water tank 14, by which a bar-shaped Al body 17 is obtd. The body is fed by feed rollers 15 and is cut to the specified length by a cutter 16, by which the article 5 is obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a deoxidizing aluminum processed product used for deoxidizing oxygen in molten steel, and an apparatus for manufacturing the same.

[Prior art]

When refining pig iron into steel, a large amount of oxygen is blown into the hot metal to oxidize and remove various unnecessary elements in the hot metal to adjust its composition, and the oxidation heat at this time maintains its molten state. During the process, most of the oxygen that does not contribute to the removal of various elements remains in the steel bath. This oxygen in steel is not only unnecessary for making steel ingots, but can even be harmful depending on the use, and deoxidation treatment is essential especially when making killed steel or semi-killed steel.

Some of the above oxygen contained in the steel bath is deoxidized by reacting with manganese and silicon in the same bath, but this alone is insufficient for deoxidizing, so a strong deoxidizing agent is generally used. An aluminum material with a strong reducing power is used as the material, and this is placed in a steel bath for deoxidation treatment.

The aluminum material may be one shaped into small granules (generally called shot aluminum), or a relatively large one with a trapezoidal or semicircular cross section (
(generally called bunker aluminum) is used.

There are various methods for manufacturing the above-mentioned aluminum products, but generally speaking, in the case of shot aluminum, the fourth
The molten aluminum 2 dripped from the nozzle 3 shown in the figure is dropped onto a cooling plate and solidified to produce a button-shaped aluminum processed product 2' as shown in Figure 5(a). In this case, as shown in FIG. 3, a mold 1 having a plurality of casting recesses 1a... is used, and as shown in FIG. 1a... and solidified, the mold 1 was turned over and taken out to manufacture an aluminum workpiece 2'' as shown in FIG. 5(b).

However, in the former method of manufacturing the aluminum processed product 2', the surface tension of one drop of molten aluminum is used to form the product, so it is not possible to manufacture large processed products such as bunker aluminum. In the aluminum workpiece 2' obtained by this method, a thick oxide film is formed near the top 2a' of the workpiece 2' as shown in FIG. 5(a).

In addition, in the latter method of manufacturing the aluminum processed product 2'', molten aluminum 2 is poured into a predetermined casting recess 1a of the mold 1, and when the flowing metal breaks down after flowing in a predetermined amount and enters the casting recess 1a, the final The trickle of molten aluminum flowing in is subjected to the impact of falling and oscillates near the upper end of the opening of the casting recess 1a, forming the trapezoidal bottom portion 2a'' of the aluminum processed product 2'' shown in FIG. 5(b). By an action similar to stirring and mixing with oxygen in the air, a thick oxide film, that is, an alumina layer, is formed over the entire outer surface of the aluminum workpiece 2#, particularly on the trapezoidal bottom surface 2a#.

As mentioned above, if a thick alumina layer is formed on the aluminum workpieces 2', 2'', the outer surfaces of the workpieces 2', 2'' will melt even if the workpieces are placed in a steel bath. Until then, the reaction with oxygen in the steel is slow.

This method has the disadvantage that the reaction takes a relatively long time and that the oxidation yield of the aluminum processed products 2', 2'' is reduced.

In the latter case, since molten aluminum is intermittently injected into a large number of casting recesses 1a..., not only is production efficiency low, but it is also difficult to supply a constant quantity of molten aluminum 2 dripping into each casting recess 1a... Therefore, variations in the injection amount tend to occur. For example, when producing shot aluminum with a weight of 8 g, the weight will be approximately 6 to 10 g, and a weight error of ±2 g will normally occur. Furthermore, variations in weight also cause variations in shape, which causes variations in the supply amount when a rotary feeder or the like is used to supply shot aluminum in a fixed amount into a steel bath.

Furthermore, when the molten aluminum 2 is sequentially transferred and dripped from one casting recess 1a to the next casting recess 1a, a part of the molten aluminum 2 is easily drawn or spilled out of the casting recess 1a, and as a result, .

As shown in FIG. 5(b), burrs 2b' are formed on the obtained aluminum processed product 2#. This Bali 2b'
This causes a catch in the quantitative supply using the rotary feeder described above, which impedes smooth supply and also causes fluctuations in the amount supplied into the furnace.

[Purpose of the invention]

The present invention eliminates the above-mentioned drawbacks of the prior art and provides an aluminum processed product with a high deoxidizing effect and a manufacturing device that can efficiently mass-produce the aluminum processed product without causing variations in weight or shape. The purpose is to

[Structure of the invention]

The deoxidizing aluminum processed product of the present invention is an aluminum processed product that has a high deoxidizing effect by using a part of the outer surface as a cut surface to form a surface that is not covered with the alumina layer that is formed on the outer surface when molten aluminum solidifies. It is characterized by the following.

In addition, the manufacturing apparatus for deoxidizing aluminum processed products of the present invention includes:
a fixed-rate supply means for continuously flowing down a fixed amount of molten aluminum; a constant-speed transfer mold path for receiving the molten aluminum flowing down from the fixed-rate supply means and continuously transferring it at a constant speed to cast an aluminum rod-shaped body; A cooling means provided midway along the constant speed transfer mold path to cool the aluminum rods cast on the transfer mold path, and a cutter that sequentially cants the cooled and solidified aluminum rods fed from the cooling means to a fixed size. It is characterized by the fact that it is equipped with

〔Example〕

An embodiment of the deoxidizing aluminum processed product of the present invention is shown in FIG.

This aluminum processed product 5 is made by cutting a bar-shaped aluminum material having a constant cross section (in this example, a trapezoidal shape with a smooth external shape) at regular intervals to form a shaped body having cut surfaces 5a, 5a at both ends. .

Next, an embodiment of the apparatus for manufacturing a deoxidizing aluminum processed product of the present invention will be described with reference to FIG.

Reference numeral 6 denotes a constant speed transfer mold path for casting aluminum rod-shaped bodies 17 while receiving molten aluminum and continuously transferring it at a constant speed. A mold 9 for casting rod-shaped bodies is formed on the surface of the conveyor. This constant speed transfer mold path 6 is suspended between a driving drum 7 and a driven drum 8.

It is driven to run at a constant speed.

A crucible 10 for molten aluminum is provided above the starting end of the constant speed transfer mold path 6, while a spout 11a is provided below the crucible 10 on the surface of the mold 9 at the starting end of the constant speed transfer mold path 6. A sprue 11 facing the molten aluminum is disposed, and these constitute a fixed quantity supply means for continuously flowing down molten aluminum in a fixed quantity. Note 8: Omitting the crucible 10 above,
Of course, molten aluminum may be poured directly from the aluminum melting furnace onto the surface of the mold 9 at the starting end of the constant speed transfer mold path 6. [Crucible for pouring molten aluminum into sprue 11] A melt feed hole 10a at the bottom is configured to be opened and closed by a stopper rod 12. 13 is a thermocouple for measuring the temperature of the molten aluminum in the crucible lO.

A cooling water tank 14 is disposed in the middle of the constant speed transfer mold path 6, and the aluminum rod-shaped body 17 that has been solidified while being naturally cooled and transferred through the constant speed transfer mold path 6,
It is configured to be sent to the primary feed roller 15 via the inside of the cooling water tank 14 .

A cutter 16 that is driven intermittently is provided at the next stage of the feed roller 15, and the cooled and solidified aluminum rod 1 is fed at a constant speed by the pair of upper and lower feed rollers 15.
7 is cut into a predetermined length by the counter 16 described above.

When obtaining an aluminum processed product 5 using the manufacturing apparatus configured as described above, first, when the pure aluminum material melted in the crucible 10 is within a predetermined melting temperature range, a motor (not shown) is driven to transport it at a constant speed. The mold path 6 is run at a constant speed. next,
Pull up the stove/bar rod 12 of Ruppo 10 and open the hot water feed hole 1.
Molten aluminum flows into sprue 11 through sprue 0a, and the molten aluminum is continuously and quantitatively supplied from spout 11a of sprue 11 onto mold 9 at the starting end of constant-speed transfer mold passage 6. The molten aluminum that is continuously supplied onto the mold 9 that is traveling at a constant speed is solidified by natural cooling to the extent that it extends into a rod shape in the traveling direction as the mold 9 advances, and is solidified in the cooling water tank 14 of the first stage. By submerging it, it is completely cooled and solidified.

The cooled and solidified aluminum rod 17 is fed to the feed roller 1.
5, and is transported at a constant speed to a cutter 16 installation position, and is cut into a fixed length by the cutter 16, which is driven intermittently at fixed time intervals, thereby obtaining an aluminum workpiece 5 having cut surfaces 5a, 5a on both ends. It will be done.

The cross-sectional shape of the aluminum processed product 5 thus obtained varies depending on the amount of supply from the sprue 11, the width of the spout 11a of the sprue, the running speed of the constant-speed transfer mold path 6, etc. It follows the shape of the elongated groove of the mold 9 that receives the aluminum.

1. By using the apparatus of the present invention, by arbitrarily changing and adjusting the groove shape of the mold 9 and the intermittent cutting speed of the cutter 16, etc., it is possible to easily produce aluminum processed products 5 of all shapes and sizes, from sit aluminum to bunker aluminum. It can be manufactured in

〔Effect of the invention〕

Since the deoxidizing aluminum processed product of the present invention has a cut surface formed on a part of the outer surface, the oxide film on the outer surface, that is, the alumina layer that is formed when molten aluminum is cooled and solidified, is formed on the cut surface. It is removed and immediately reacts with the oxygen in the steel without waiting for the outer surface to melt in the steel bath, making it possible to deoxidize it in a short time and melting quickly, so a large amount of aluminum processed products can be used. In this case, it is possible to avoid the inconvenience that some undissolved substances occur and the utilization yield deteriorates. Furthermore, there is a cut plane.

This means that an edge-like part coexists on a part of the outer surface, so compared to the conventional case where the entire outer surface is a smooth curved surface, the outer surface area is wider, and the deoxidation reaction area increases accordingly. It has the advantage of further improving the acid effect.

In addition, the apparatus for manufacturing an aluminum processed product of the present invention includes: casting molten aluminum into a continuous rod-shaped body by dropping a fixed amount of molten aluminum onto the mold surface at the starting end of a constant-speed transfer mold path that travels at a constant speed;
Furthermore, aluminum processed products are manufactured continuously by cooling and solidifying the product using a cooling means and cutting it into fixed lengths using a cutter. A thick oxide film, ie, an alumina layer, is not formed on the outer surface of the aluminum alloy, and there is no variation in weight or shape, making it possible to obtain aluminum processed products that always have a constant weight and shape.

For example, when obtaining an aluminum processed product weighing 8 g using the device of the present invention, the upper and lower limits are 7.5 to 8.5 g, and the error is ±0.5 g, which is the weight error in the conventional method described above. This is a significant improvement compared to ±2g. By making the weight and shape uniform, when a rotary feeder or the like is used to feed aluminum processed products in a fixed amount into a steel bath, accurate fixed amount feeding is possible without fluctuations in the amount supplied. Further, unlike in the case of the conventional system, no burr is generated in the aluminum processed product, so that it is possible to avoid the inconvenience that the burr causes a catch during the above-mentioned quantitative supply and prevents smooth supply.

Furthermore, since aluminum products are formed by cutting aluminum material that has been cooled and solidified into rods into fixed lengths, part of the manufacturing process also serves as the formation of the cut surfaces, and the outer surface Aluminum processed products with less oxide film, that is, with high deoxidizing effect, can be easily manufactured.

Moreover, since aluminum rods are cooled and solidified and continuously fed out, they are sequentially cut into fixed lengths with a cutter to obtain aluminum products, making mass production extremely easy and reducing manufacturing costs. It is possible to produce effects such as a significant reduction.

Furthermore, by arbitrarily adjusting the mold surface shape of the constant speed transfer mold path, the intermittent cutting speed of the cuckoo, etc., there is an advantage that a wide range of products from shot aluminum to bunker aluminum can be manufactured.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example of a deoxidizing aluminum processed product according to the present invention, FIG. 2 is an overall schematic side view of an apparatus for manufacturing a deoxidizing aluminum processed product according to an embodiment of the present invention,
The figure is a perspective view of a mold used in the conventional intermittent dripping method, FIG. It is a perspective view of the obtained aluminum processed product for deoxidation. 5 is an aluminum processed product, 5a is a cut surface, 6 is a constant speed transfer mold path, 9 is a mold, 10 is a crucible, 11 is a sprue, 11a
is a spout, 14 is a cooling water tank, 15 is a feed roller, 16
is a cutter, 17 is an aluminum rod-shaped body,

Claims (1)

[Claims] 1. An aluminum processed product for deoxidizing, characterized in that a cut surface is formed on a part of the outer surface. 2. A metered supply means for continuously and quantitatively flowing down molten aluminum, and a constant speed transfer mold path that receives the molten aluminum flowing down from the metered supply means and continuously transfers it at a constant speed to cast an aluminum rod-shaped body. and a cooling means provided midway through the constant speed transfer mold path to cool down the aluminum rods cast on the transfer mold path, and a cutter that sequentially cuts the cooled and solidified aluminum rods sent from the cooling means to a fixed size. An apparatus for manufacturing aluminum processed products for deoxidation, characterized by comprising: