SU969441A1 - Method for breaking continuously cast billet - Google Patents

Description

(Si is a method of breaking a continuous casting

one

. The invention relates to a foundry industry and is intended for breaking up continuously cast billets into dimensional parts during a drawing process.

A known method for separating a continuous billet into dimensional parts without the formation of chips. Proposed by electric arc, induced current, etc. create a separating layer on the metal mirror, which does not combine with the next portion of the metal Tl1 entering the mold.

The main disadvantage of this invention is that, in principle, it cannot be applied to continuous casting methods with ingot extraction upwards or in the horizontal direction.

In addition, it can practically be accomplished only by interrupting the continuous casting process.

. The closest method of continuous casting of billets for rolling, especially tubular billets. In this method, cutting of continuous-cast billets is carried out by means of high-frequency induction coils (inductors), covering the workpiece with a gap of several millimeters. The inductor can be lifted, Q rotated after work to its original position, or the required number of inductors can be located at a given distance required to cut the workpiece 2.

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The main disadvantage of this method is that when cutting with an inductor, the metal is melted at the heating point. This metal goes into irretrievable losses. Meltdown

Claims (2)

This metal inductor requires a long time and considerable energy consumption. This prevents the use of a high-frequency installation for cutting several ingots, which reduces productivity. In addition, the ends of the cookings are melted and need to be trimmed. The purpose of the invention is to increase production, saving metal. The goal is achieved by the fact that in the method involving the separation of part of the workpieces due to local heating of the workpiece by a high-frequency inductor, this heating around the perimeter is performed to a temperature of 0.8-0.99 solidus temperature of the metal of the workpiece. the separation of a part of the billet with a force in the direction of its movement exceeding the tensile strength of the metal at the solidus temperature. Breaking of the continuous-casting billet into dimensional parts is carried out as follows. The inductor, which, with a certain gap, attains a blank along the perimeter, at a given moment of time begins to move synchronously with the blank in the direction of its movement, i.e. exclude the relative movement of the inductor and the workpiece. Simultaneously with the beginning of the inductor movement, a voltage is applied to it and the pre-heating of the workpiece is started to a temperature of 0.8-0.99 of the solidus temperature of the cast metal. Reheating to a temperature of less than 0.8 the solidus temperature requires great effort for breaking part of the workpiece. These forces can be transmitted to the mold, which can lead to a disruption of the formation of the workpiece and the termination of the casting process. Razogr to a temperature greater than 0,99 of the solidus temperature leads to the melting of the metal and without it (negative losses. This causes an increase in energy costs and the duration of breaking the separation of part of the workpiece, which reduces the productivity of the installation. In addition, the quality of the cut workpieces Simultaneously with the supply of voltage to the inductor, a force directed along the movement of the workpiece is applied to the detachable part of the workpiece. The applied force creates a voltage equal to 1.1-2.0 of the metal strength at temperature solidus and exceeding the tensile strength of the metal at the site of heating with its inductor, in connection with which breaking or separation of a part of the workpiece occurs. After that, the voltage is released from the inductor and returned to its original position. At this time, the high-frequency setting can be used to cut another continuous cast billet. After the billet has a predetermined length, movement is again applied to the inductor, a voltage is applied to it and the process of breaking or separating part of the billet is repeated. PRIOR. The continuous cast iron pipe is produced with an outer diameter of 110 mm and a wall thickness b mm with a water-cooled inductor, which is supplied with voltage from a high-frequency ICHG with a power of 60 kW and a frequency of 66 kHz. The inductor is a ring made of a copper tube, insulated with an asbestos cord that covers the pipe around the perimeter with a gap of 3 mm. At the installation site of the inductor, the pipe is heated to a temperature that was 0.92 of the solidus solidus temperature. A force of 600 kg is applied to the detachable part of the billet with a length of 1 m in the direction of pipe extraction. This force causes a voltage of 0.3 kg / mm in the place of heating of the pipe wall. The tensile strength of the cast iron at 0.23 kg / mm. The separation of the cut part of the workpiece occurs 3 seconds after the voltage is applied to the inductor. At the same time an even circular cut is achieved without melting the ends. The implementation of the cut by melting the metal must be performed within 6 seconds. At the same time, about 10% of metal from each cut is spent on irretrievable losses. Claims The method of breaking a continuously cast billet, including the separation of a part of the billet due to local heating by its high-frequency inductor, is distinguished by the fact that, in order to increase productivity and save metal, local heating of the billet along the perimeter is performed to a temperature of 0.8 -0.99 solidus temperature of the metal of the workpiece, and simultaneously with heating, part of the workpiece is separated by an effort in the direction of its movement, five exceeding the metal Gfichnosti limit 1. Patent of Germany No. 900263, at a solidus temperature. In 22 D 11/126, published in 1968. Information sources, 2. Patent of Great Britain No. 726555, taken into account in the examination of cl. 83/1, 83 /, published. 1970.