JPH0639514A - Device for heating nozzle for continuous casting - Google Patents

Abstract

PURPOSE:To control a molten metal temp. to a constant at the time of reopening a work and over the whole term of casting by executing the heating control of a bar-like heater surrounding the outer periphery of a molten metal injection nozzle. CONSTITUTION:Into plural holes 4 opened in the one side of an end surface in a ring-like metal block 1 having the tapered hole 2 of the size and the shape corresponding to the outer periphery of the nozzle, the bar-like heaters 3 are inserted. Current conducted into the bar-like heater 3 is controllable by the output of a temp. sensor 9 through a thyrister, etc. When the solidified aluminum in the inner part of the nozzle at the time of stopping the drive of a machine is liquefied, and over the whole term of the casting, by precisely controlling the bar-like heater 3 according to the detected temp. of the temp. sensor 9, the molten metal temp. can be made to the constant.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nozzle heater for continuous casting, and more particularly to a heater for a molten metal injection nozzle in an aluminum die casting machine.

[0002]

2. Description of the Related Art In an aluminum die casting machine, the molten aluminum injection nozzle is cooled when the machine is out of operation, so that the aluminum solidifies inside the nozzle. Therefore, at the time of rework, the nozzle is heated by a burner or the like to liquefy the aluminum inside and then injection is started.

In another example, JP-A-2-220748.
As shown in Japanese Patent Laid-Open Publication No. 2003-242, instead of a burner, a plasma arc is used to melt the solidified aluminum.

[0004]

However, in the case of using the burner as described above, not only the noise is large and the indoor air is not contaminated, but also the temperature control cannot be performed precisely, so that the heating temperature is too low and the aluminum is burned. There were drawbacks such as inability to melt and adverse effects on injection molding due to too high a temperature.

Further, in the method using the plasma arc, since the carbon electrode is inevitably used, the exhausted carbon powder enters the molten aluminum to deteriorate the quality of the product, and the apparatus is large and expensive. .

The present invention eliminates the above drawbacks.

[0007]

A nozzle heating device for continuous casting according to the present invention comprises a metal block surrounding the outer periphery of the molten metal injection nozzle, and a plurality of rod-shaped members arranged so as to surround the outer periphery of the molten metal injection nozzle in the metal block. It is characterized by comprising a heater. Further, the continuous casting nozzle heating device of the present invention further has a detection means for detecting the temperature of the metal block and a control means for controlling the heating by the rod-shaped heater according to the temperature of the metal block.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

In the present invention, as shown in FIGS. 1 and 2, a ring-shaped metal block 1 and a tapered hole 2 formed in the center of the metal block 1 having a size and shape matching the outer circumference of the nozzle.
And a plurality of rod-shaped heaters 3 such as sheathed heaters, and insertion holes 4 of the plurality of rod-shaped heaters 3 which are arranged adjacent to each other around the tapered hole 2 and are opened on one end surface of the metal block 1. Configure a nozzle heating device for continuous casting.

A cylindrical lead wire guide 5 is fixed to the metal block 1 adjacent to the one end face, each lead 6 of each rod-shaped heater 3 is projected from one end thereof, and each lead wire 7 is arranged in parallel. And lead it to the outside through the lead wire guide 5. If the metal block 1 is divided into two, it is convenient to attach it to the nozzle. Reference numeral 8 is a lid for closing the insertion hole 4 after inserting the rod-shaped heater 3.

In another embodiment of the present invention, the metal block 1 is provided with an insertion hole 10 for a temperature sensor 9 such as a thermocouple, and the output of the temperature sensor 9 supplies a current to the rod-shaped heater 3 through a thyristor or the like. Control it.

FIG. 3 shows another embodiment in which the insertion hole 4 of each rod-shaped heater 3 extends parallel to the surface of the tapered hole 2.

[0013]

Since the continuous casting nozzle heating device of the present invention has the above-mentioned structure, the nozzle can be heated very easily by heating the rod heater 3 during the rework of the die casting. The configuration is extremely simple and can be small.

Further, when the temperature sensor 9 is provided, the heating by the rod-shaped heater 3 can be precisely controlled according to the detected temperature. Therefore, not only during the rework but also during the entire casting period. There is a great advantage such that the temperature of the molten aluminum passing through the nozzle can be controlled to be constant by heating the rod-shaped heater 3.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view of a continuous casting nozzle heating device of the present invention.

FIG. 2 is a side view of the continuous casting nozzle heating device of the present invention.

FIG. 3 is a vertical sectional front view showing another embodiment of the nozzle heater for continuous casting according to the present invention.

[Explanation of symbols]

 1 Metal Block 2 Tapered Hole 3 Rod Heater 4 Insertion Hole 5 Lead Wire Guide 6 Lead 7 Lead Wire 8 Lid 9 Temperature Sensor 10 Insertion Hole

Claims (4)

[Claims] 1. A nozzle heating device for continuous casting, comprising a metal block surrounding the outer circumference of the molten metal injection nozzle and a plurality of rod-shaped heaters arranged in the metal block so as to surround the outer circumference of the molten metal injection nozzle. . 2. The continuous casting nozzle heating device according to claim 1, further comprising a detection means for detecting the temperature of the metal block and a control means for controlling heating by the rod-shaped heater according to the temperature of the metal block. . 3. The continuous casting nozzle heating device according to claim 2, wherein the detection means is a thermocouple embedded in the metal block. 4. The continuous casting nozzle heating device according to claim 1, wherein the metal block is divided into two parts so as to hold the molten metal injection nozzle.