JPS58145341A - Continuous casting method of metal - Google Patents

Abstract

PURPOSE:To improve the quality of cast ingots and the yield of casting in continuous casting using a water cooled casting mold by pressing a horn for transmission of ultrasonic waves on the mold and oscillating the mold ultrasonically. CONSTITUTION:The preceding end of a horn 4 for transmission of ultrasonic waves connected to an ultrasonic oscillator 3 is pressed to the upper part of a water cooled casting mold 1 provided with a water cooled jacket 2 to oscillate the mold 1 ultrasonically. Molten metal 6 is charged into such mold 1, and a solidified ingot 7 is drawn out continuously from the bottom end of the mold 1. The mold 1 is oscillated finely and the wettability of the mold 1 and the metal 6 is improved by the above-mentioned method. An initial solidified layer is thus grown uniformly, and the air gap between the mold 1 and the solidified layer is made uniform, whereby the delay in local solidification is obviated. The surface defects of the ingot 7 and the defects, such as shrinkage cavities, produced in the central part are reduced effectively.

Description

[Detailed Description of the Invention] In the present invention = metal j141! This method is directly based on the I#Ij manufacturing method, and in particular, an ultrasonic machine is added to the casting to improve the quality of the ingot.

Generally, it is known that defects in ingots cause the thickness of the ingot to deteriorate during post-processing such as rolling, which significantly impairs the quality of the product. Such defects in the ingot occur due to the unevenness of the mold shape.
This often occurs due to local poor contact between the noodles and uneven heat extraction.To counter this problem, equalize the mold or create molds in #i order that can mask the non-uniformity of mold properties. The selection of coating agent is being considered. However, none of these methods has achieved sufficient effects.

The present invention is based on this problem, and as a result of extensive studies, it has been found that by adding super-sonic wave motion directly to the mold and casting, an ingot with no defects and high quality can be obtained, and the ingot has excellent quality. A continuous casting method for metals was developed, in which the metal core was removed from one end of the water-cooled mold, and the solidified ingot was continuously drawn out from the other end. This method is characterized by pressing and applying ultra-neck wave vibration to the mold for casting.

In detail, the present invention is a water-cooled casting 11 (1) with a water-cooled jacket (2) provided on the circumference as shown in Figure s1.
& Press the tip m of the strain transmission main (4) connected to the vibrator (31) to apply ultrasonic vibration to the mold.

Metal bath # (61) is injected from the upper end of the water-cooled mold (1) through the nozzle (5) through the nozzle (5) into the casting II (11), and the solidified ingot is poured from the lower end of the casting mold (11). (7) is continuously 1: drawn out.

When ultrasonic vibrations are applied to the mold in this way, the mold vibrates, and this vibration improves the wettability between the time wheel and the welding ridge, and the initial hardening process is affected by the unevenness of the mold properties. The raw cum is uniformly mixed, and the mold and solidified lily! The air gap of il #1 song is also uniform).

Eliminates local bell delay. This is effective not only for surface defects in the ingot, but also for the center sL of the ingot - the low convergence holes that occur - and significantly improves the crystallization of the ingot.

The position to press the ultrasonic transmission horn against is your fist! (2)
The mold (1) near the mold (1) 4 inside the casting metal (1) (8)
I&! It is also desirable that the enemy is a warship.This is because the metal mold comes into contact with the casting gong and begins to solidify, and the mold and bath water come into close contact with each other.
This is because vibration acts most effectively.

The transmission efficiency of ultrasonic waves depends on the rigidity of the object to be transmitted or the mold, and objects with low rigidity transmit more efficiently. Therefore, 8 blood to 8 blood from the second fat is 1! ! 1llll
Gold ll1 on the outside I4 side of the shaft Oυ with one wheel.
4iIK end belt 0 [pressure wheel a curve and guide wheel (not shown), etc. 6) in contact with mold Q
Lv formation L% and cast wrinkled belt joining-beginning 41i! 1g)
Press the tip of the ultrasonic transmission horn (4) connected to the ultrasonic #1 vibrator (3) onto the belt I to form a mold υ bell) (Add ultrasonic vibration to 11. This 0). Then, inject the casting 1J (I) into the nozzle shaft provided at the GILLS mouth and start the belt joining of the casting 1J (I). By continuously pulling out IjIkwg of ingots from a saw, quality ingots can be obtained.

However, the separation of the Mosquito belt is extremely t#Jt transmission 3-a)
2 is desirable, and the belt thickness is 0.6 m.
When it comes to 1B, the ultrasonic transmission hose is pressed by force.)
This is not practical because the belt deforms.

In the case of 1 direction @ Ming, the term ``friendly hole'' refers to one with a Qin number of several Kklx or more, and it is desirable that the direction of the ultra-1 wave transmission horn that is pressed against the mold is as perpendicular to the side wall of the mold as possible.

Hereinafter, two F1 fruit 8414g of the present invention will be explained.

Example (1) Water-cooled casting shown in Figure 1! 0 pure steel was continuously cast by the method of the present invention. An ultrasonic transmission horn was applied to the outside of the water-cooled mold in the vicinity of the 6th stroke at almost right angles, and casting was performed while applying ultra-t* vibration to the llI type.

Ingot 1TIf [L shape is 180mm, medium 500mf]
& rectangular, 1111-shaped Tsuya was set at 150 m/min, and the following conditions were: output x KW, 2, 1 #, and 3 KW, and the number of loops was 20 and the amplitude was 15 tones.

In this way, the number V of surface defects per ton (2, continuously cast ingots 34) was determined. For comparison, an ingot cast without applying ultrasonic vibration10toai41)
I missed the table 1IIIIEvX. These results are shown in the 1JI table.

1141 Table Example (2) * Pure Alt continuous aS was produced by the method of the present invention using a belt-and-wheel type continuous casting machine shown in 21W. Casting was carried out by pressing an ultrasonic transmission horn almost perpendicularly to the outside of the belt at the part where the molten metal comes into contact with the mold and applying one-stroke vibration to the mold.

The mold is made of a J111 caster made of one piece of steel and a steel belt with a thickness of 23 m, and the ingot is 21 strokes per minute.
, 2KW and 3KW, each Mi pattern number is 20KHz
, Shaking width kg 15 fi J: *The thus cast ingot was then hot rolled into a rough drawing wire with a diameter of 8.0 mm, and this was processed using the vortex #I plowing method to produce 10 tons of defects. I asked for a number.

For comparison, the number of defects V per 191,811 m was determined for a rough drawn line formed in the same manner without applying ultrasonic vibration.

These results are shown in the 1m8 table.

112 Table Run #I (31 Actual Jlk Example (21 and xii) and continuous casting of pure rubber.

The position where the ultrasonic transmission horn is pressed is different, but the output of the ultra-f branch is 300W, the frequency is 15 voices in 8-1 vibration,
*att-Horiito genuine steel belt rhinoceros L O,
Casting was performed with a knee change of 6 to 4.0-1. After rough drawing these ingots in the same manner as in Example 1II4 (21), the number of defects per IQtOKm-1 was determined.

For comparison, we used steel belts with a thickness of 1.5 mm and 2.5 mm to find the number of defects per 10 tons of rough wire that was continuously cast and hot rolled without adding ultrasonic vibration. Ta. These results are shown in Table 113.

As is clear from Table 3, Table 1, Table 2, and Table 3, the ingot produced by the method of the present invention, which was cast by applying ultrasonic vibration to the mat, had a lower number of defects by L% compared to the ingot produced by the conventional method. It can be seen that it is decreasing steadily.

In addition, in the method of the present invention in which a belt-and-wheel casting method in which a super-structure IIL is applied to the belt that forms the -S of the mold, the number of defects in the ingot decreases; Thickness 13L! ! It can be seen that by setting wm to F, the number of defects occurring in the ingot is significantly reduced.

Although the water-cooled casting of Cu and the belt-and-wheel type continuous casting of Cu have been described above, the present invention is not limited thereto, and can also be applied to other continuous casting methods such as the twin belt method. In addition, we have explained Cu and Muko as cast metals, but of course Cu alloys, Amu alloys, re, Pb, Za
It can also be applied to and its alloys.

As described above, the method of the present invention can produce a single lump of crystal 1[v, which is the same as above, without any enlargement of defects during subsequent processing,
V also has an industrially useful effect such as china clay LII.

4. Scandalous quantity rate of noise removal Figure 1 is an explanatory diagram showing an example of the method of the present invention using a water-cooled mold, and Figure 2 is an illustration of an example of the method of the present invention using belt-and-wheel type continuous casting. It is an explanatory diagram.

1.Water? IIrflIlj! 2. Jacket 3.
Ultrasonic & Ml 1,400, ultrasonic transmission ho ν 5. nozzle
6. Bath-8, Hesi-direction 10. Mold 11. Rotating wheel for casting 12, concave groove 13. metal belt 15
．． , Nozzle 16, Dropped hand mirror correction document (spontaneous) August 12, 1930, Commissioner of the Japan Patent Office Kazuo Wakasugi 1, Indication of the case 1982 Patent Review No. 7181λ Name of the invention Financial continuous casting method 3, Relationship to the amendment case Patent applicant address: Mr. No. 1, Marunouchi, Chiyoda-ku, Tokyo
Name (iHl) Old 1i! m1ll Koshizuku Co., Ltd. 4,
Agent address: Kanda Kitamo-cho, Chiyoda-ku, Kuruma Higashibu, 1@Ban-0
Column 6 of the detailed description of the invention in the 1st page 3rd floor specification, ? li positive content

Claims (1)

[Scope of Claims] (11 Injecting metal #1jII from one end of the water-cooled mold and pouring out the # ingot from the other end in a method of pulling out the ingot in a far-distant manner,
Casting＠l: A metal continuous casting method characterized by pressing a super-wrinkle transmission horn and casting with M sonic vibration added to the casting impression. (2) -st of water ~ mold! - A method for slow casting of gold as claimed in claim 1, wherein the shaft is formed of a metal belt and a super neck wave transmission main is pressed against the belt to impart super vibration. (The continuous casting method of metal according to claim 1 or the second period, which applies ultrasonic motion by pressing a super-responsive transmission horn to the mold of molten metal in the mold of 31) .