JPH0491849A - Mold device for continuous casting - Google Patents

Abstract

PURPOSE:To hold a tip part of solidified layer to the prescribed position and to prevent leakage of a molten metal, breakage of a cast billet, etc., by constituting a heater of a mold communicating to a casting furnace with plural heating elements as independently controllable, arranging a cooler as slidable forth and back and embedding temp. sensors at the prescribed interval. CONSTITUTION:The heater at outer periphery of the mold 1 for continuous casting opened at both ends fitted as communicating with the casting furnace 2, to the side near the casting furnace 2 and the heater 4 in the mold device for continuous casting arranged with the cooler at outer periphery of outlet side of the cast billet, are constituted of plural heat elements 3 as independently controllable to each other. Further, the cooler 5 is arranged as slidable in front and back directions and also plural temp. sensors 6 are embedded at the prescribed interval in the front and back directions in the mold wall so as to be possible to optionally control temp. distribution in the mold 1.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a mold apparatus for continuous casting in which the temperature distribution of the mold can be changed arbitrarily, thereby making it possible to start casting easily.

[Conventional technology and its issues]

Continuous casting is a continuous casting method in which a mold with both ends open is installed in communication with a casting furnace, and the molten metal supplied from the casting furnace is cooled and solidified in the mold and continuously drawn out as an ingot. It is widely used for casting such as.

By the way, how to start the continuous casting method as described above,
A dummy iron (hereinafter abbreviated as dummy) is inserted into the mold in advance, molten metal is adhered and solidified to the tip of the dummy, and then the dummy is continuously pulled out.

However, the mold equipment used in conventional continuous casting methods has a heater and a cooler fixedly arranged around the mold, and the heating is controlled all at once, so the temperature distribution of the mold is not constant. Therefore, the solid-liquid interface position 1 when drawing out the dummy
changes with each casting cycle; sometimes the ingot is pulled out unsolidified, causing leakage, and other times, the solidified layer extends to the metal body in the mold, increasing the frictional resistance with the mold and causing the ingot to melt. If the ingot breaks, and if it breaks, the dummy is pushed in again and the solidified layer is returned to the casting furnace to restart, but when the dummy is pushed in, the inner surface of the mold gets scratched, causing rough skin in the resulting ingot. There was a problem.

[! [One Step to Solve the Problem] The present invention was developed as a result of intensive research in view of the above situation, and its purpose (7) is to easily start casting without causing any trouble. The purpose is to provide continuous casting mold equipment.

That is, the present invention provides a heater on the outer periphery of a continuous casting mold with both ends open, which is attached to the casting furnace through communication L5, near the casting furnace.
The continuous casting mold apparatus is equipped with a cooler on the outer periphery of the ingot outlet, and the heater is composed of a plurality of heating elements each of which can be heated independently, and the cooler is installed in the longitudinal direction. The temperature sensor is slidably provided in the mold wall, and a plurality of temperature sensors are embedded in the wall of the mold at predetermined intervals in the front-rear direction.

Below, the molding apparatus of the present invention will be explained in terms of structure with reference to the drawings.

FIG. 1 is a side sectional view showing one embodiment of the mold apparatus of the present invention. In the figure, 1 is a mold, 4 is a heater, 5 is a cooler, and 6 is a temperature sensor.

One end of the mold 1, which is open at both ends, communicates with the two casting furnaces 2C and is numbered 1. A heater 4 consisting of a plurality of heating elements 3 is installed around the outer periphery of the two casting furnaces of the above-mentioned mold 1, and a cooler 5 is installed around the M circumference of the ingot L side of the mold 1. It plays a role closely related to No. 1. The heating resistors 3 of J are, for example, silicone ~, l, etc., and are each independent (7) and electrically wired. Also, the 75 heater 1i is an internal water-flow type shampoo throat, etc., and is connected to the front and rear direction. It can be used for 7 placements and 4 slices.In addition, the temperature sensor for mold 1 is set to 0.

Multiple thermocouples, etc., are buried at intervals.

When starting casting using the molding apparatus of the present invention in which the mold is equipped with a heater and a cooler and a temperature sensor is embedded, the method shown in FIG. 2, 6. 2. Insert the dummy 7 into the mold 1 so that its tip is located between the heater 4 and the cooler 5, as shown in the work explanatory diagram at the start of casting. Step 4 - After heating the mold 1 to a predetermined temperature, pour molten metal IKB into the casting furnace 2, introduce the molten metal 8 into the mold 1, and then pass water through the cooler 5. to cool the dummy 7 and melt the molten metal 8 at the tip of the dummy 7.
The temperature sensor 6 embedded in the mold 1 estimates the tip position of the solidified layer in the mold 1, and when the tip of the solidified layer reaches a predetermined position in the mold 1, the dummy 7 is gradually moved. Pull it out and start casting.

During this time, the position of the solidified tip inside the mold 1 is determined by measuring the temperature distribution of the mold every moment with a temperature sensor 6.Based on the measurement results, the individual heating elements 3 of the heater 4 are controlled to turn on and off, and the cooler It is controlled by sliding 5.

In the present invention, in addition to the above-mentioned silicone, the heater is made of
Canthal et al. is applied.

The mold apparatus of the present invention can be applied to any continuous casting method such as the normal horizontal continuous casting method or the contracted continuous casting method. Applicable to any pulling method, such as a method that repeats the pushing cycle.

In addition, according to the mold apparatus of the present invention, it is possible to change the casting speed during casting while keeping the solidification tip position substantially fixed, and high-quality ingots can be cast with a good yield.

(Function) In the present invention, the IA near the casting furnace of a mold with both ends open is
1- The heater is composed of a plurality of heating elements that can individually control the heating; It is constructed in such a way that it can be slid in the front-rear direction of the mold (L7), and multiple temperature sensors are embedded in the mold at predetermined intervals in the length direction of the mold, so the temperature distribution of the mold can be set arbitrarily. Therefore, the length of the solidified layer formed at the tip of the dummy at the start of casting can be accurately set to a predetermined length, that is, the position of the tip of the solidified layer can be accurately set to a predetermined position. No troubles such as ingot breakage will occur.6 [Example] The present invention will be explained in detail below with reference to Examples.

A rod-shaped ingot of phosphor bronze alloy having a diameter of 2511+1 was manufactured using the mold apparatus shown in FIG. The mold has a wall thickness of 20ff.
im, using a cylindrical graphite mold with a length of 450++ m,
One end is embedded in the casting furnace to a length of 30 mm and fixed, and the outer periphery of the 420 mta mold part, which protrudes horizontally from the casting furnace and has a cavity of 420 mta, is close to the casting furnace. Installed in 3 rows at 60mm intervals, -1, Inner diameter 55m + n on the circumference, i% 200
mm cylindrical water-cooled jug; A wooden thermal lightning pair was embedded to measure the temperature distribution of the mold.

In addition, a heat insulating material is placed at the mold center point Δ6 to create a heat-insulated state between the cooler and heater.

First, a copper dummy with a diameter of 16 mm and 25 mm was inserted into the casting star so that its tip was at the center point of the mold, and then the silicone heater was energized in all three rows to close the mold. was heated to 900'C. However, by pouring molten phosphor bronze alloy into a sufficiently heated casting furnace,
Then, the molten metal was supplied into the mold. When the temperature distribution of the mold was measured with a temperature sensor, the temperature near the dummy tip to the 30th order casting furnace was 1090"C, which exceeded the melting point of phosphor bronze.Then, the cooler was slid and -Y position 30mm in front r:: h-, open,
10 j! /win's cooling main volume 7. Start cooling 2. After holding this state for 0.5 minutes,
When the mold temperature at point 13, which is 30 mm closer to the casting furnace, was higher than the melting point of phosphor bronze, the dummy was pulled out for 0.2
Intermittent withdrawal was performed at a withdrawal speed of 40 mm/win and a stop time of 0.8 seconds.

The ingot stuck to the tip of the dummy and was pulled out, so there was no leakage or breakage. 10 after starting casting
After a few minutes, the mold temperature steadily reached the solidification temperature near point A, and a shiny and healthy ingot was stably produced over a long period of time. Gradually increase the withdrawal speed to 60m+m/+ during casting.
During this time, the mold temperature was monitored, and in order to prevent the solidification point from shifting from point A, the third row of silicone rows from the casting furnace side was turned off, and the cooler was placed in contact with the heat insulating wall. The ingots were brought to the casting furnace side until the ingots reached the same temperature, and the water flow rate was further increased to 15 i/sin, and the speed was changed while cooling was strengthened, so that even during the speed increase, the produced ingots were sound and free of defects from beginning to end.

〔effect〕

As described above, according to the method of the present invention, the temperature distribution of the mold can be controlled arbitrarily, and therefore, it is possible to maintain the solidification tip position in the mold at a predetermined position. Troubles such as leakage and breakage of the ingot can be prevented, and the quality of the ingot can be kept low by changing the casting speed, which is a remarkable effect in the T industry.

[Brief explanation of drawings]

FIG. 1 is a side view showing one embodiment of the molding device of the present invention, and FIG.
The figure shows a work explanation at the start of casting in a continuous casting method using the mold apparatus of the present invention. 1...Mold, 2...Casting furnace, 3...Heating element, 4
... Heater, 5 ... Cooler, 6 ... Temperature sensor number -
Figure 1 Figure 2

Claims (1)

[Claims] A continuous casting mold device that is equipped with a heater on the outer periphery of a continuous casting mold that is open at both ends, which is connected to the casting furnace, and a cooler on the outer periphery of the ingot outlet side. The container is composed of a plurality of heating elements each of which can be independently heated, and the cooler is provided so as to be slidable in the front and rear direction,
Furthermore, a continuous casting mold apparatus is characterized in that a plurality of temperature sensors are embedded in the mold wall at predetermined intervals in the front and back direction.