SU703576A1 - Method of melt processing in a mould - Google Patents

Description

(54) METHOD FOR MELTING. IN LITHIUM

FORM 1aiyo tg9Y; erys) {ytfed yeni pris-, dock in the volume of the ingot (casting). The goal is achieved by the fact that equilibrium additives are distributed on a sluggish rod, which is fixed in the field of the form to its full depth before pouring the melt. In this case, a uniform distribution of the material in the ingot volume (casting) is achieved due to the uniform introduction of the additive during the mold casting and active sparging of the molten metal by the wood sublimation process. The gases produced during sublimation are preservative; 1Hg: 11; 11 ЖИШ® b% yoSH / ler1r and deoxidizing additives from secondary oxidation. Black carbon that is released during wood sublimation is deposited on the walls of the structure or, as a lubricant, sat. This improves the quality of the surface of the ingots or HIPS. - -. ™, -;, .. Ai, -, .., ..- i .... With the introduction of additives on the wood rod into the melt with a speed greater than 0.003 and / s at a wood consumption of less than 2 g / s (the lifting speed of the metal in bubbling is so weak that convective currents are not able to provide an even distribution of additives. With their introduction at a speed of more than 0.02 O m / s (wood consumption more than 7 g / s), the depth of the wood rod with additives increases dramatically, the intensity of wood sublimation increases, and TQieTajirta emissions from the mold or form. The core is located along the height of the mold, has a uniform coating and is rigidly fixed in the upper part, and when the mold is filled with the melt, the consumption of wood and material is constant, i.e. At each moment of filling, the calculated amount of wood and rare-earth metals are consumed at one time. In addition, Tz is the result of the sublimation of wood below, the level of the melt achieves the power of ty boiling mixing of the metal, which, by the way, dissolves the additive and its interaction with the steel. Energy blending causes the distribution of the additive in the melt, the refining of the metal from non-; In order to protect the melt by means of wood sublimation products. In particular, it is recommended to use :. yawning the way for adding to the pacnMfej Ryoykoz capacitive elements.

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703576

4 PRI me R The method was tested when obtaining steel castings with a mass of 4pO kg. The shell-type chromium-nickel steel was smelted in an open-hearth furnace. Additives - rare earth silicides (REM) in the amount of 0.15% by weight of steel, attached to a wooden rod 8 mm in diameter with polyvinyl acetate glue. Impregnated rods with a coating of additives were introduced into the cavity of the form to the bottom and fixed on a profitable extension. Liquid metal from the dispensing bucket was poured in a siphon way, into sand forms at a speed of 0.003-0.02 o m / s. With the abatement of the ckbjpoCTH immersion of more than 0.020 m / s, there was a release of metal. In the process of casting observed an intense release of black carbon and sparging metal. The oxidation of the metal surface in the form was not visually noted. In similar conditions, an additive of silicides of rare-earth metals was tested in the same amount on a metal rod 5 mm in diameter (bond — liquid glass) - at a speed of 1.15 m / s. Bubbling almost absent. The release of black carbon was insignificant. On the surface of the metal in the form was clearly visible crust, oxides. The quality of the surface of the castings in the first case was high, there were no surface defects of the shell, sandpits, floods, etc. When using the known method, these defects occurred in terms of the quantity. The castings were cut across in two horizons, upper and lower, and controlled by the content of rare-earth metals in the cross section. The results of chemical analysis are presented in the table. - - An attempt to introduce rare-earth metals with a wooden framework (according to the prototype) led to a marriage of 2 ingots. When filling 1/3 of the mold, the REM was completely melted and dissolved in the metal, as a result of which the lower cortical layer of the ingot contained REM 2-3 times more than the upper one. When filling 2/3, the full metal burned out - FL-r - .- - L; - i ---- - ----, - Wood frame, resulting in the upper part of the ingot (about 1 / 3), due to the energetic 6g6 oxidation of the meniscus of the melt, was affected by twisting of the peel.

703576

On metal rod5. Thus, the introduction of additives into the melt according to the proposed method bakes uniform distribution of their cross-section castings.,

Claims (2)

1. Japanese Patent No. 46-33361, cl. 1 United Arab Emirates, 1971. 2. Japan patent number 5O-6l74, i cl. In order to increase the uniformity of the input of additives, Hto is distributed evenly on the wooden rod, which is fixed in the mold cavity throughout its depth.