JPH059749U - Reflective low pressure casting machine - Google Patents

Abstract

(57) [Summary] [Purpose] Protects the heater from sodium when low-pressure casting of molten aluminum charged with sodium by a reflection type low-pressure casting machine. [Structure] The heater 8 is mounted in the heat insulation furnace 1 while being housed in a ceramic protective tube 4.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement of a reflection type low pressure casting machine for low pressure casting of molten aluminum containing sodium as an inoculant.

[0002]

[Prior Art]

 Conventionally, as one of the reflection type low-pressure casting machines, molten aluminum is heated and kept warm by using a reflection type heat-retaining furnace having a heater placed above it, and the inside of the heat-retaining furnace is pressurized to melt the molten aluminum. Some are configured to inject into a mold.

[0003]

[Problems to be solved by the device]

 However, when the conventional reflection type low-pressure casting machine configured as described above is used to perform low-pressure casting of molten aluminum containing sodium as an inoculant, the heater disposed above the molten aluminum causes There was a problem that it was corroded by adhesion and had a very short life. The present invention has been made to solve the above problems.

[0004]

[Means for Solving the Problems]

 In order to achieve the above object, the reflection type low pressure casting machine of the present invention is installed in a heat-retaining furnace with the heater housed in a ceramic protective tube so that sodium does not adhere to the heater.

[0005]

【Example】

 An embodiment will be described with reference to the drawings. As shown in a sectional front view of FIG. 1, a horizontal mold unit 3 is installed inside a heat insulation furnace 1 via a furnace lid 2. In addition, a plurality of protection tubes 4 made of ceramic having relatively high corrosion resistance are arranged side by side on the upper side of the heat insulation furnace 1, and each protection tube 4 is, as shown in FIG. Both ends are inserted into the recesses 5 and 5 formed on the inner surface of the heat insulating furnace 1 and are supported via the heat insulating materials 6 and 6 loaded in the recesses 5 and 5 (see FIG. 3). The heat insulating material 6 is a cotton-like material made of glass fiber, such as Kao Wool bracket manufactured by Isolite Co., Ltd., and has elasticity and air permeability. In the side wall of the heat insulation furnace 1, through holes 7, 7 oriented in the left-right direction in FIG. 2 are formed concentrically with the recesses 5, 5, and the protection tube 4 is penetrated through the through holes 7, 7. The heater 8 is installed. Each heater 8 is housed in the protection tube 4 by penetrating the protection tube 4, fixed to the heat retaining furnace 1 with mounting flanges 8A and 8A at both ends, and a seal 10 seals a gap with the heat retaining furnace 1. Furthermore, a terminal 11 is provided at the negative end, and the terminal 11 is surrounded by a cover 12 attached to the heat insulation furnace 1. Reference numeral 13 is a stalk for communicating the cavity of the mold apparatus 3 with the inside of the heat insulation furnace 1, and 14 is an inspection lid.

In the apparatus configured as described above, after charging molten aluminum charged with sodium into the heat insulation furnace 1, electricity is supplied to the heaters 8 and 8 to heat the heat insulation pipe 4 by the heaters 8 and 8 and heat the heat insulation tube 4. When the molten aluminum in the heat insulation furnace 1 is heated by the heat radiation of the tube 4 and maintained at the required temperature, the sodium in the molten aluminum evaporates, but the heaters 8 and 8 are surrounded by the protective tubes 4 and 4. The evaporated sodium does not adhere to the heaters 8 and 8. Further, by pressurizing the inside of the heat insulation furnace 1, the air containing sodium in the heat insulation furnace 1 flows through the heat insulating materials 6 and 6, and the inside of the protection tube 4 is passed through the gap between the tip of the protection tube 4 and the heat insulation furnace 1. However, when the air flows through the heat insulating materials 6 and 6, sodium is removed, so that the sodium does not flow into the protective tubes 4 and 4. In this way, the aluminum in the heat insulation furnace 1 is heated and maintained at the required temperature.

[0007]

[Effect of the device]

 As is clear from the above description, in the present invention, since the heater is surrounded by the protective tube, the heater is not exposed to sodium, so that sodium is not attached to the heater and the heater is not exposed. Has an excellent practical effect such as a much longer life than other heaters in this type of device.

[Brief description of drawings]

FIG. 1 is a sectional front view showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is an enlarged view of part B in FIG.

[Explanation of symbols]

 4 Protective tube 8 Heater

Claims (1)

Claims for utility model registration: 1. A reflective low-pressure casting machine in which molten aluminum charged with sodium as an inoculant is heated and kept by a heater disposed above the molten aluminum. Is installed in the heat insulation furnace 1 in a state of being housed in a protective tube 4 made of ceramics.