JPS583753A - Continuous casting of light alloy cast lump - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to metallurgy and to a method for continuous casting of special VC@alloys.

The present invention can be used for casting light alloys used in the production of deformed products such as plates, forgings, various rolling shapes, and other products.

In the production of light alloys, which are characterized by high chemical activity in the molten state, great consideration is given to removing nonmetallic impurities from the molten metal.

The demands on the purity of metals and alloys, especially with regard to their hydrogen content in the form of solid non-metal oxide inclusions, are becoming ever more stringent. For example, in some items of Al-Nicum alloys, such as cavacitator foils, 10μ
Oxide inclusions larger than m are not allowed.

As another example, ingots of high strength [11] alloys of medium and especially large cross-sections (e.g. diameters of 650- or more or cross-sections of 400-
Xi200■ and higher) are characterized by a coarse feathery texture, high hydrogen content and porous tubes even when vacuum melted and tube cast.

The process by which a large ingot structure is formed and the resulting porosity reduces the ingot plasticity and increases the tendency for cracking during casting of the ingot limits the normal ingot size that can be cast. , which reduces the plasticity of the alloy in subsequent processing steps.

The situation of continuous casting of these light alloys is the basis for the widespread industrial use of ultrasonication of molten metals for effective metal purification and refinement of cast structures. A method of continuous casting of light alloy ingots, consisting of applying 1* hot water to at least one radiator in order to purify and refine the structure of the solidified ingot, and drawing out the same qKMM Federal Inventor Certificate No. 353.760, Classification BO6b, 1
972) is known.

This method is carried out at a high casting speed If (for example 30 m/m1n) and the molten metal is sonicated for a short time, thus making it possible to cast ingots of small cross-section. In applications for the casting of medium and large cross-section ingots, the casting crash is substantially reduced (1 to 2 m/m1n), and the ultrasonic treatment requires a long time, which leads to substantial overheating of the molten metal and increases the risk of damage during solidification. The liquid phase of the ingot comes out of the mold.

Another disadvantage of the known method is that the non-uniformity of the textural refinement increases with the size of the ingot.

A further disadvantage of the known method is that due to the short duration of the ultrasound action, the heating of the molten metal is insufficient, resulting in an ineffective removal of gaseous and solid non-metallic inclusions. That's true.

It is therefore an object of the present invention to provide a method for continuous casting of light alloy ingots which increases the plasticity of the light alloy during casting as well as during subsequent deformation.

The present invention provides that the ultrasonic action on the ninth bath for purifying the molten metal and refining the structure of the solidifying ingot is carried out in such a way as to increase the plasticity of the light alloy during the casting process as well as during subsequent gIL shaping. The objective is to provide a continuous casting method for light alloy ingots.

The purpose of this is to inject the bath water, apply ultrasonic waves to the molten metal by at least one radiator in order to purify the bath water and refine the structure of the solidifying ingot, and at the same time to withdraw the ingot. According to the present invention, in a method for continuous casting of a @spear alloy ingot, the ultrasonic action on the molten metal for the purpose of purifying the molten metal and refining the structure of the solidifying ingot is applied to the cross-sectional area of the casting to be solidified. 2 to 6 as a function of
applied uniformly over the cross-section of the molten metal with an intensity in the range of 0 W/-, for which the radiator is immersed in the bath to a depth equal to between the blue wavelength stones in the molten material;
And the temperature of the bath water is 1O to 1 on the liquefaction ff1lf of the molten metal material.
Coupling is achieved by maintaining the temperature at 50°C.

Purifies bath water by passing it through a porous material,
It is preferable to keep the distance between the radiator and the porous material equal to the distance between the wavelength of blue in the molten metal and -.

According to the present invention, the amount of solid nonmetallic inclusions in the ingot material is reduced by one-half, and the hydrogen content is reduced by two to one-third, so that the deformation process during the casting process and subsequent deformation process is possible. In the meantime, the plasticity of the light alloy ingot is improved.

The present invention also provides a highly refined form of light alloy ingot structure having a casting particle size such as dendrite (41ULm) Jf8 cell structure or even finer, which allows further casting. Improve the plasticity of light alloy ingots during the process as well as during its further deformation.

The invention will now be described with reference to specific embodiments in conjunction with the accompanying drawings.

The continuous pouring method for light alloy ingots of the present invention uses at least one radiator for the purpose of injecting molten metal, purifying the molten metal, and refining the structure of the ingot to be solidified. While maintaining the temperature at 10 to 150°C above the liquefaction temperature of
The radiator was immersed in the molten metal to a depth equal to the depth of the blue wavelength in the molten metal material, and the #I radiation was applied with an intensity of 2 to 60 W/cd as a function of the cross-sectional area of the solidifying ingot. It consists of applying ultrasonic waves in such a way that they are uniform over the cross section, and in the process - pulling out the lumps.

According to the present invention, the bath water is purified by passing it through a porous material, and the distance between the radiator and the porous material is maintained equal to the wavelength of the blue wavelength in the molten material. The continuous casting method of light alloy ingots according to the present invention can be used in any known apparatus to purify the bath water and solidify the ingot.
This can be done by adding a super-ta action to the VcIII hot water to refine the texture.

In one known embodiment of an apparatus for continuous casting of light alloys, a bath 3 is injected through a spout 2 [ll1 (Figure 1).
It consists of: Ultrasonic radiator 6n, flik
The blue wavelength within the liquid phase portion 4 of the 3 materials is reflected. The solidified portion 7 of the ingot 5 is drawn out from the cast ff1l.

According to the invention, a porous material 8 (@2@) is provided across the flow of hot water 3 in the known device.

The spacing between the radiator 6 and the porous material 8 is made equal to the odor of the blue wavelength within the portion 4 of the bath 3 material.

FIG. 3 shows the structure of a solidified portion 7 (gl, FIG. 2) of an ingot of AI-Cu-Mg alloy having a diameter of 650 mm. The tissue 9 (FIG. 3) consists of subdendritic particles 10 made to a small lateral size of 0.1 mm, equal to or smaller than that of a dendrite cell (not shown).

The method according to the present invention consists of mixing 41 ingot delay 1III
This is done in the manner described above in known devices.

Molten metal 3 (FIG. 1) is injected into the casting funnel l through the pouring pipe 2. Casting [For 1 yen, molten metal 3 purifies $83 and turns into bath water 3.
(FIG. 11) is acted upon by an ultrasonic radiator 6 to purify a mass 5 of tissue 9 (FIG. 3) that coagulates. The ultrasonic action is 2 as a function of the cross-sectional area of the solidified ingot 5.
It is applied uniformly over the cross section [iiK] of the molten metal 3 with an intensity of 60 W/d and a temperature of 10 to 150° C. above the liquefaction temperature of the molten metal 3.

The invention will now be described with reference to the following practical examples.

Example 1 The following composition: Cu, 3.844; Mg, 1
．． 45%; Mn.

0.41 vomit: Fe, 0.11 vomit; 8, 0.04'
An ingot 5 of an Al-Cu-Mg light alloy having 1:Ti, 0.041:Zr, 0.151 was processed to a diameter of 650-diameter by the method of the present invention under the three sets of conditions listed in Table 1. Minted during $111 (first @).

Iris 1 table I! Annealing temperature f 638°C As a result of examining the structure and performance of the above alloy, it was found that the method according to the present invention improves the normal plasticity of annealed or homogenized ingots compared to the conventional standard method. It has been shown to increase the amount by 1.5 to 2 times. This is due to the homogeneous refinement of the cast particles 10 (l [Fig. 3), the low hydrogen content and the production of a unique sub-deadrite structure with a particle size lO equal to or smaller than that of the dendrite cells. It has been achieved.

Table 2 shows the data for the ingot material KH of 650 m [11] of the Al-Cu-Mg alloy obtained by the method of the present invention in three sets of ultrasonic treatment conditions F.

Table 2 The above structure 9 (Figure 3) and the changes in performance are:
This dramatically reduces the tendency of cracking in ingots with diameters exceeding 650 m.

Example 2 Ultrasonic action was excessively used to purify the molten metal 3 (Fig. 2) of Al-Cu-Mg light alloy during the casting of an ingot with a diameter of 204 mm. The ultrasonic action on the molten metal 3 has a frequency of 18K.
Temperature in Hz [740℃, i.e. 100℃ above the liquefaction temperature of molten metal 3
℃, the force of 40 W/cd was applied uniformly over the cross section of the #l block. The porous material 8 was constructed by laminating glass fiber cloth having a mesh size of 0.6 x 0.6 m. Porous material 8
The distance between the radiator 6 and the radiator 6 is between 20 and 40 mm, i.e. 1/6 of the sound wave length in the molten aluminum 3 (according to reference data, 18 KHz in the molten aluminum).
The sound wavelength of 240 μm was shown to be 240 μm.

Data regarding the purity of the material of the ingot 5 cast by the method of the present invention are shown in Table 813.0 Table 3 in the margin below indicates the content of AI, U, and hydrogen in the material of the ingot 5 by the bromine-methanol method. The amount was determined by vacuum extraction.

According to the invention, the hydrogen and oxide content is reduced by IK by 2 to 3 minutes compared to known methods due to ultrasonic action throughout the porous material V-shaped by the multilayer filter.

The method according to the invention, through the purification of the alloy and the refinement of its structure, allows the four-strong 1ft! This allows normal large-sized ingot casting of the alloy.

[Brief explanation of drawings]

Figure jI1 is a front sectional view of a well-known continuous casting light alloy ingot gi11 used in carrying out the method of the present invention, and Figure 2 is a continuous casting 1M111 of a light alloy that is purified by passing through a porous material according to the present invention. FIG. 3 is a 100 times enlarged view of the structure of a 650 mm diameter mass of an annealed light alloy containing seven subdendritic grains according to the present invention. 1... Ingot, 2... Pour pipe, 3...
...SO. 4...Ingot liquid phase-15...Ingot, 6.
... Ultrasonic radiator, 7 ... Solidified part of ingot 5, 8 ... Porous material, 9 ... Structure of ingot 5, 10. ...Subdendritic particles. Patent Applicant Vladimir Ivanovich Dopackin (14 others) Patent Attorney Patent Attorney Akira Aoki Patent Attorney Kazuyuki Nishidate Among them 1) Yukio Patent Attorney Akira Yamaguchi Continued from page 1 0 Author Roberto Rodionovich Malinowski, Soviet Union, Moscow, Leningradsky Prospekt 75, Kwarchyk 448 0 Inventors Petro Nikifuorovich Shilaev, USSR, Spertrowskaya Oblast Verkhnyaya Sarada Ulitsa Kay Lipknefta 8 Kwarchyla 3 0 Inventors Author: Pictor Kuzmichi Unishev USSR Speltrowskaya Oblast Verkhnyaya Salad Ulitsa Kay Markusa 11 Kwarchila 41 0 Inventor Alexander Ilych Matveyev USSR Speltrowskaya Oblast Verkhnyaya Salad・Ulitsa Kay Rybknefta 12 Kwarchila 34 0 Inventor Gennady Sergeyevich Makarov Soviet Union Moscow Ulitsa Matveevskaya 10 Korpus 2 Kwarchia 64 0 Inventor Viktor Alexandrovich Danilkin Soviet Union Moscow Ulitsa Vopryskaya 16 Kwarchia 918 C Inventor Andre Dmitrievich Andreev Soviet Union Moscow Ulitsa Voplyskaya 20 Kwarchila 69 @ Inventor Polis Ivanovich Bondarevov Moscow Soviet Union Moscow Varbikhinskaya Ulitsa 8 Korps 2 Kwarchila 51 0 Author Babel Evimovich Khodakov Soviet Union Moscow Skolkowskony Shosui 16 Kwarchya 51 0 Author Gennady Vasilyevich Cherebokuts United States Kybyshev Prospekt Metallugov 73 Kwartyk 54 0 Inventor Vladimir Mikhailovich Baranchikov USSR National Power Mensk Uralsky Uritsa Isetka Type 6 Kwarchila 16 ■Applicant Georgiy Iosifovitch Niskin Soviet Union Moscow Ulitsa Vavilova 48 Kwarchila 281 ■Applicant Stella Ilinichna・Borovikova, Soviet Union, Moscow, Ulitsa Vinilakaya, 13 Kwarchila 140 0 Applicant: Robert Rodionovich Malinowski, Soviet Union, Moscow, Leningradsky Prospekt 75, Kwarchila 448 ■Applicant: Petro Nikiforovich Shilayev, Soviet Union, Speltrowskaya Oblast Verkhnyaya Salad Ulitsa Kei Lipknefta 8 Kwarchila 3 ■Applicant Pictor Kuzmich Unishev Soviet Union Spertrowskaya Oblast Verkhnyaya Salad Ulitsa Kei Marksa 11 Kwarchila 41 ■Applicant Alexander Ilych Matveev, Soviet Union, Spertrowskaya, Oblast, Verkhnyaya, Salad, Ulitsa Kay, Rybknefta, 12 Kwarchila, 34 ■Applicant: Gennady Sergeyevich Makarov, Soviet Union, Moscow, Ulitsa, Matheevskaya, 10, Korps, 2, Kwarchila, 64 ■Applicant Person Viktor Alexandrovich Danilkin, Soviet Union, Moscow, Ulitsa Voprzyskaya 16, Kwarchila 18 ■Applicant: Andre Dmitrievich Antreev, Soviet Union, Moscow, Ulitsa Voprzyskaya 20, Kwarchyla 69 ■Applicant: Polis Ivanovich Bondarev, United States of Moscow・Mozaiskoye Shosuy 80 Kwarchila 11 ・Applicant Beter Nikolayevich Shvetsob Soviet Union Moscow Barbikhinskaya Ulinoa 8 Korpus 2 Kwarchila 51 ■Applicant Babel Evimovich Khodakov Soviet Union Moscow Skolkowskony Shosuy 16 Kwarchia 51 ■ Applicant Gennady Vasilyevich Cherebokuts United States Kybyshev Prospekt Metallugov 73 Kwarchila 54 ■Applicant Vladimir Mikhailovich Baranchikov USSR National Power Mensk Uralsky Uritsa Isetska Type 6 Kwarchila 16

Claims (1)

[Claims] 1. Injecting bath water (3)! Wfly (3)
The molten metal (3
) is subjected to ultrasonic waves and at the same time the ingot (5
) to purify and refine the structure (9) of the casting a (5) that hardens from the molten metal (3).
) of the molten metal (3) with an intensity of 2 to 60 W/csl as a function of the cross-sectional area of the ingot (5)
The radiator (6) is immersed in the molten metal (3) to an equal depth from the radiator of the blue wavelength to the material of the molten metal (3). ) temperature is IO to 150℃ above the liquefaction temperature of the material of molten metal (3)
'fI: Features of continuous casting method for light alloy ingots 02, #l hot water (3) is purified by passing through the porous material (8)'t, and the radiator ( 6) and porous material (8)
The distance between the blue wavelengths in the molten metal (3) and 1.
4. The method according to claim 1, wherein the method is set equal to between 4 and 4.