JPH0666860U - Holding furnace equipment for low pressure casting - Google Patents

Abstract

(57) [Summary] [Object] An object of the present invention is to provide a holding furnace device for low pressure casting in which the temperature of the upper portion of the stock tube is maintained at an appropriate temperature to prevent the temperature drop of the molten metal in this portion. It is a thing. [Structure] A support member 4 composed of a heat insulating material 6 and a casing and having a communication hole 5 in the center is provided on the upper lid member 2 of the furnace body 1, and a heater 8 and a temperature are provided on the support member 4. A holding furnace apparatus for low pressure casting in which a sensor 9 is provided and a stock pipe 11 is inserted into the furnace body 1 through the support member 4 through the communication hole 5.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a holding furnace device for low pressure casting, in which a molten light alloy in a furnace is pushed into a cavity of a mold through a stock tube and poured to perform casting.

[0002]

[Prior art and problems]

 Conventionally, a stock pipe provided in a low pressure casting furnace as described above is generally inserted into the inside of the furnace body from above and suspended. The upper part of such a stock pipe, which is not immersed in the molten metal in the furnace, is cooled by the atmosphere in the furnace and the lower die to be pressure-bonded. There was a problem that the molten metal at the mouth of the mold solidified earlier than the product part and could not perform a sufficient feeder action, resulting in casting defects such as shrinkage cavities. Further, when the molten metal in the stock pipe is cooled, the pressured molten metal is released and the low temperature molten metal is returned to the inside of the furnace, causing a problem of lowering the temperature of the entire molten metal. The present invention has been made in view of the above problems, and an object of the present invention is to provide a holding furnace apparatus capable of performing low-pressure casting by maintaining the temperature of the upper position of the stock pipe at an optimum temperature. is there.

[0003]

[Means for solving problems]

 In order to achieve the above-mentioned problems, the holding furnace apparatus for low pressure casting according to the present invention has a through hole formed in an upper lid member of a furnace body, and an upper and lower portion of the upper lid member which communicates with the through hole at a central portion thereof. A support member consisting of a heat insulating material having a through hole for penetration and a casing for holding the outer surface of the heat insulating material is attached, and the peripheral surface of the communication hole in the support member is electrically connected to the temperature controller. A heater is installed in a plurality of stages and a temperature sensor for outputting a signal to a control panel for controlling the temperature controller of the heater is inserted from the outside of the supporting member and the tip thereof is communicated with the communication member. A stow tube having a flange at the upper end is inserted into the furnace body from above so that it is provided so as to project into the hole, and the flange is locked to the upper surface of the support member. It is characterized in that the stock pipe is suspended.

[0004]

[Action]

 According to the present invention, by adopting the above-mentioned solution, the upper position of the stock pipe is heated and adjusted to the optimum temperature by the heater and the temperature sensor, and the molten metal is prematurely solidified at the upper position of the stock pipe. Also, it becomes possible to perform low pressure casting while preventing the temperature of the molten metal from decreasing.

[0005]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. A through hole 3 is formed in the upper lid member 2 of the furnace body 1, and a support member 4 is attached to the upper portion of the upper lid member 2. The support member 4 is composed of a heat insulating material 6 having a vertically communicating hole 5 communicating with the through hole 3 in the center thereof, and a casing 7 for holding the outer surface of the heat insulating material 6. . On the peripheral surface of the communication hole 5 in the support member 4, there are installed heaters 8 electrically connected to a temperature controller (not shown) in a plurality of stages and the temperature controller of the heater 8 is connected. A temperature sensor 9 which outputs a signal to a control panel (not shown) for controlling the temperature sensor is provided from the outside of the support member 4 and has its tip protruding into the communication hole 5.

Further, with respect to the communication hole 5 and the through hole 3, a stock pipe 11 having a flange portion 10 at the upper end is inserted into the furnace body 1 from above, and the flange portion 10 is inserted into the support member 4 The stock pipe 11 is suspended from the upper surface of the stock pipe 11. A lower die 12 is fixed to an upper portion of the flange portion 10 of the stock pipe 11, and a sprue portion 13 of the lower die 12 is communicated with the communication hole 5. An upper die 14 which is moved up and down via an upper die plate (not shown) is fitted on the upper portion of the lower die 12, and the cavity C is defined by the lower die 12 and the upper die 14. Is made. In the figure, R is molten aluminum.

In such a structure, in the state of FIG. 1, the heater 8 is electrically heated, the temperature inside the communication hole 5 is measured by the temperature sensor 9, and the temperature signal is not shown. Output to the control panel, and heating is continued through the temperature controller (not shown) until it reaches the set temperature. After reaching the set temperature, the temperature controller operates according to the temperature signal from the temperature sensor-9 to set the set temperature. The on / off control is performed so as to maintain it. In this state, compressed air is supplied to the upper part of the molten aluminum R in the furnace body 1, and the molten aluminum R is raised through the stock pipe 11 and pressurized from the sprue 13 into the cavity C, and the cavity C The molten aluminum R inside and inside the sprue 13 is held until it solidifies.

At this time, the molten aluminum R at the upper position in the stock pipe 11 is cooled by the heating of the heater 8 through the stock pipe 11 which is heated to the optimum temperature. It will not solidify and will fully serve the feeder. Next, the supply of compressed air is stopped, the interior of the furnace body 1 is communicated with the atmosphere, and the molten aluminum R in the stock tube 11 is returned to the interior of the furnace body 1. At this time, the aluminum melt R returned is not cooled, so that the temperature of the melt in the furnace body 1 is not lowered. After that, the upper mold 14 is raised to take out the cast product, the upper mold 14 is matched with the lower mold 12, and the above-described operation is repeated. In the above embodiment, the stock pipe 11 and the lower mold 12 are fixed, but the same applies even if the lower mold 12 can be lifted and separated from the stock pipe 11. The effect of is obtained.

[0009]

[Effect of device]

 As is apparent from the above description, the present invention is designed so that the temperature of the upper part of the stock pipe is measured by the temperature sensor and the heating is controlled by the heater so that the temperature can be maintained at an appropriate temperature at all times. It is possible to prevent the problems caused by the above, and the advantage is remarkable.

[Brief description of drawings]

FIG. 1 is a sectional view showing a main part of a low-pressure casting machine embodying the present invention.

FIG. 2 is a congratulatory view taken along the line AA in FIG.

[Explanation of symbols]

 1 Furnace Main Body 2 Upper Lid Member 3 Through Hole 4 Support Member 5 Communication Hole 6 Heat Insulating Material 7 Casing 8 Heater 9 Temperature Sensor 10 Flange Part 11 Stalk Pipe

Claims (1)

[Scope of utility model registration request] 1. A through hole 3 is formed in an upper lid member 2 of a furnace body 1, and the through hole 3 is formed in an upper portion of the upper lid member 2 and in a central portion thereof.
A support member 4 including a heat insulating material 6 having a vertical through hole 5 communicating with the heat insulating material 6 and a casing 7 for holding the outer surface of the heat insulating material 6 is attached, and the peripheral surface of the communication hole 5 in the support member 4 is attached. In addition, the temperature sensor 9 for outputting a signal to a control panel for controlling the temperature controller of the heater 8 is installed while winding the heater 8 electrically connected to the temperature controller in a plurality of stages. A stalking pipe 11 having a flange portion 10 at the upper end is provided from above from the upper side of the communication member 5 and the through hole 3 by inserting the support member 4 from the outside and providing the tip thereof to project into the communication hole 5. A holding furnace apparatus for low pressure casting, characterized in that the holding tube apparatus is inserted into the furnace body 1, and the flange portion 10 is locked to the upper surface of the support member 4 to suspend the stock pipe 11.