SU1519829A1 - Method of horizontal continuous casting - Google Patents

Abstract

This invention relates to metallurgy, in particular to continuous horizontal casting of billets. The goal is to improve the quality of blanks by stabilizing the modification process. Cast iron before it is fed into the metal receiver is modified by feeding the modifier into the melt in a gas-shielding cavitation flow with a tangential gas supply to it. Next, the cast iron is fed to the mold, from which the ingot is drawn. With this modifier feed, the process of modifying the cast iron is stabilized and its quality is improved. 2 Il.

Description

This invention relates to metallurgy, in particular to continuous horizontal casting of billets.

The purpose of the invention is to improve the quality of the workpiece by stabilizing the modification process.

FIG. I shows an installation diagram for carrying out a method for continuous horizontal casting of blanks; in fig. 2 - layout of the mold mold - a metal receiver.

The installation includes a frame I (Fig. 1), a conveyor 2, a pulley cage 3, a drive 4, a mechanism for breaking workpieces 5, a metal reservoir 6, a mold 7, a seed 8 and a cover 9. The metal plate 6 (Fig. 2) contains a cover 9 and a device for supplying the modifier 10. The cover 9 contains a pouring bowl II, a tangential runner 12, a reaction section 13, a slit hole 14, a tangential gas supply tuyere 15, a metering device 16, a plate 17, an opening for a gas burner 18.

The installation works as follows.

A mold 7 and a cover 9 are installed on the metal reservoir 6. A gas burner (not shown) is installed in the hole 18. The device 10 is filled with a modifier. Heat metal receiver to the required temperature. A blank 8 is clamped into the cavity of the mold 7 and clamped with a rolling stand 3. Gas is supplied to the gas supplying tuyere 15. From the casting ladle (not shown), liquid iron is poured into bowl II. At the same time include the metering device 16 and serves modifier 8 in the reaction section 13. The melt through the tangential Gating course 12 enters the reaction section 13.

The inert gas through the gas supply tuyere 15 fills the reaction section 13 and creates a gas-shielding cavitation flow. The melt fills the reaction section 13 and creates a vortex flow in which the modifier starts to dissolve. This process continues with the vortex of the melt-melt and the cavitation flow behind the shield gas in the reaction section until the modifier is completely dissolved. Melt

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through the drain hole 14 is poured into the metal receiver 6, from where it enters the mold 7, where it is welded to the seed 8. After the required holding time, turn on the drive 4, which drives the pulling stand 3 and the seed 8, and 7, an ingot (not shown) is pulled out according to a predetermined mode. Depending on the metal consumption through the mold 7, the cast iron casting period is set so that the level of the metal in the metal receiver 6 does not drop below the inlet of the mold 7 and the modifier action time does not expire.

The reaction section 13, in which the modification takes place, is designed in such a way that the melt supplied to the reaction section creates a vortex flow, and the inert gas supplied through the gas supplying tuyere 15 from the opposite side creates a gas-protective cavitation flow. The modifier from the metering device 16 is introduced in the local gas-cavitation flow, where the melt is modified. The melt thus modified is transported in the vortex flow of the reaction section.

Example. Prepare billets from cast iron in a continuous casting plant containing a frame, roller tables, a rolling stand, an actuator, a mechanism for breaking billets, a metal receiver with a lid, a mold and a seed. Metal receiver is equipped with a device for induction heating of the metal. The lid is stuffed with a multitorkundum mass MK-80. In this case, using a wooden template, a casting thicket, a reaction section of 0200 mm with a tangential iron supply and a drain hole of 034 mm are made. On the opposite side, nitrogen is pressed tangentially with the help of a gas-powered lance under a pressure of 1.5 atm. The metering hopper is filled with the LCM-2 ligature, crushed to a fraction of 0.5-2 mm. The starting cast iron is melted in the ICT-10 induction furnace, and before filling it is treated in a ladle with a ligature of FSGSM b in an amount of 0.2%. Liquid iron is fed into the pouring bowl at a flow rate of 10 kg / s, from where it passes through a runner gate to the reaction section, where nitrogen is fed through the gas lance and the LCD-2 ligature from the metering hopper at a flow rate of 0.15 kg / s. Cast iron and nitrogen supplied tangentially into the reaction section create vortex, gas-shielding, cavitation flows that interact with the ligature supplied from the metering device. The treated melt enters the cavity of the metal receiver, from where it goes to the mold, where it solidifies

ingot which is extracted by

t the bottom of the cage. The resulting ingot by the cutting device is divided into dimensional blanks. Using the proposed method of continuous horizontal casting of workpieces allows to produce ingots with stable mechanical properties and structure, increase the degree of assimilation of the modifier by 16-32% due to the intensification of its interaction with the melt and reduction of air oxidation of oxygen, to mechanize the process of introducing the modifier into the melt with significant simplify the production process. Reduce the operating costs of production due to a decrease in depreciation costs, the energy intensity of the process.

The stable quality of the blanks is achieved by the fact that the modifier dissolves and the modifying process takes place uniformly throughout the entire volume of the melt poured in the gas-protective flow, oxygen and hydrogen are removed from the melt due to

treatment with an inert gas, as well as the fact that the holding time of the modified iron is the same throughout the entire process.

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Claims (1)

Invention Formula Method for continuous horizontal casting of cast iron billets, including the supply of melt and modifier to the metal accepting section, supplying the modified metal to the metal receiver, further feeding it into the crystallizer and subsequent stretching from the crystallizer of the workpiece, characterized in that in order to increase the quality of the workpiece by stabilizing the process modifying, the modifier is fed into the melt in a gas-shielding cavitation flow with a tangential gas supply to it. / P 67,8 M / ; / 4 5 1 -ooo / / / / / / I  4 5 IS