JPH04129566U - Low pressure casting equipment - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a low-pressure casting device that can minimize oxidation of molten metal and ensure good quality of cast products. [Structure] A through hole 11 is provided in the shoulder of the holding furnace 4, and a hot water supply stalk 12 for appropriately replenishing the holding furnace 4 with molten metal 5 is inserted into the through hole 11. This hot water supply stalk 12 is connected to the holding furnace 4 via a flange portion 12a. The hot water supply stalk 12 extends diagonally downward to near the bottom of the storage chamber 6, and its tip is immersed below the surface of the molten metal 5. A communication hole 14 communicating with the storage chamber 6 is provided in the upper part of the hot water supply stalk 12 . When replenishing the storage chamber 6 with molten metal 5, the lid 13 is removed and the molten metal 5 is poured from the hot water supply stalk 12. Since the hot water supply stalk 12 extends below the liquid level of the molten metal 5, the molten metal to be replenished is introduced without contacting the molten metal remaining in the storage chamber 6 outside the hot water supply stalk 12, and when replenishing the molten metal, the molten metal liquid level It is possible to minimize the disturbance of the

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a low-pressure casting device, particularly for holding molten metal to be supplied to a casting mold. Regarding holding furnaces.

0002

[Prior art]

In low-pressure casting equipment, the molten metal used for casting is first stored in a holding furnace. The furnace is pressurized and the molten metal in the holding furnace is supplied into the casting furnace. like this An example of a low-pressure casting apparatus is disclosed in Japanese Utility Model Application Publication No. 101156/1983. this In the disclosed structure, an inert gas is supplied to the gas phase of the holding furnace to pressurize the inside. This allows the molten metal in the holding furnace to be pushed up into the casting mold through the supply stalk. It has become.

0003

[Issue to be solved]

By the way, when replenishing molten metal to this holding furnace, conventionally, a Molten metal was being poured into the water supply hole. However, with this method, the molten metal A portion of it oxidized when it came into contact with the outside air, which adversely affected the quality of the cast products. The present invention was designed in consideration of these circumstances, and aims to minimize oxidation of the molten metal. To provide a low-pressure casting equipment that can ensure good quality of cast products. With the goal.

0004

[Means to solve the problem]

Low-pressure casting equipment to solve the above problems supplies molten metal to the casting mold. A holding furnace containing the holding furnace, and a supply that is immersed in the molten metal of the holding furnace and supplies the molten metal to the casting mold. A feed stalk, one end of which is immersed in the molten metal of the holding furnace, and the other end communicates with the outside of the holding furnace. and a hot water supply stalk for supplying molten metal to the holding furnace. It is characterized by being provided with a communication hole that communicates with the gas phase inside the holding furnace.

[0005] The gas phase portion of the holding furnace is filled with inert gas.

[0006]

[Effect]

According to the present invention, the holding furnace includes a supply stalk that supplies molten metal to the casting mold, and a holding furnace. A hot water supply stalk for replenishing molten metal is installed inside the holding furnace, and both are located near the bottom of the holding furnace. It is open. Therefore, this opening is located below the molten metal level in the holding furnace. In other words, the tips of both stalks are submerged below the surface of the molten metal. For this reason, the The molten metal from the hot water stalk is introduced into the holding furnace without being exposed to the outside air. Oxidation of molten metal can be suppressed. The reason for this is the existence of a hot water supply stalk. Therefore, the difference between the molten metal introduced into the holding furnace during hot water supply and the molten metal remaining in the holding furnace is The contact must be broken, and the inside of the hot water supply stalk must be in communication with the gas phase of the holding furnace. To achieve this, inert gas introduced from the holding furnace gas phase into the hot water supply stoke cools the outside air. Ingress is prevented and the interior of the holding furnace is thereby isolated from outside air. etc.

[0007] As a result, the liquid level of the molten metal in the holding furnace is suppressed from undulating, and the gas phase of the molten metal in the holding furnace is suppressed. contact with the surrounding area and outside air is suppressed as much as possible. Therefore, the molten metal in the holding furnace is affected by the hot water supply. It will be extremely rare to receive it.

[0008]

【Example】

Referring to FIG. 1, a cross section of a low pressure casting apparatus 1 according to an embodiment of the present invention is shown. ing. The low pressure casting apparatus 1 of this example has a cavity 2 of a predetermined shape, and the cavity 2 has a predetermined shape. A casting mold 3 for supplying molten metal into the casting mold 2 for casting, and a retainer for holding the molten metal to the casting mold 3. It has a holding furnace 4. A storage chamber 6 for storing molten metal 5 is formed in the holding furnace 4 . Protection An inert gas passage 7 for introducing inert gas into the storage chamber 6 is provided at the upper part of the side wall of the holding furnace 4. I get kicked. Further, a through hole 8 is provided in the upper wall of the holding furnace 4. A supply stalk 9 for supplying molten metal 5 to the casting mold 3 is inserted. This supply strike The tip of the arc 9 is connected to the casting mold 3 via the flange 9a, and the lower end is connected to the reservoir chamber. It extends to near the bottom of the molten metal 5 and is immersed below the surface of the molten metal 5. The supply stalk 9 is It is fixed to the holding furnace 4 via a bracket 10 that supports the flange portion 9a. The joint between the bracket 10 and the supply stalk 9 and the joint between the bracket 10 and the holding furnace 4 gives airtightness.

[0009] Further, a through hole 11 is provided in the shoulder of the holding furnace 4. A hot water supply stalk 12 is inserted into the holding furnace 4 for appropriately replenishing the molten metal 5. This hot water supply The stalk 12 is connected to the holding furnace 4 via the flange portion 12a. Also, hula A lid 13 is attached to the surface of the hinge part 12a so as to maintain an airtight state. In addition, the hot water supply stalk 12 extends diagonally downward to near the bottom of the storage chamber 6, and its tip is It is submerged below the surface of the molten metal 5.

0010 Referring also to FIG. A through hole 14 is provided. In the above structure, when supplying the molten metal 5 in the storage chamber 6 to the casting mold 3, the through hole is 7 supplies inert gas to pressurize the storage chamber 6 and supply the molten metal 5 to the stalk 9 Push it up into the casting mold 3 through. At this time, the inside of the hot water supply stalk 12 and the storage chamber Since it is connected to the gas phase section 6 through the communication hole 14, the pressure between the two is equalized. Therefore, even if the lid 13 is not installed properly and is not airtight, the molten metal There is no problem of leakage to the outside.

[0011] When replenishing the storage chamber 6 with molten metal 5, remove the lid 13 and pour the molten metal 5 into the hot water supply stalk 1. Pour from 2. In the structure of this example, the hot water supply stalk 12 extends below the liquid level of the molten metal 5. Therefore, the molten metal to be replenished is outside the hot water supply stalk 12 remaining in the storage chamber 6. is introduced without contacting the molten metal. Therefore, the movement of the molten metal surface when replenishing the molten metal The vibration can be minimized.

0012 In addition, it is possible to completely cut off contact between the molten metal remaining in the storage chamber 6 and the outside air. can. The inert gas is supplied to the hot water supply stalk 12 through the communication hole 14 of the hot water supply stalk 12. This also prevents the molten metal being replenished from coming into contact with the outside air. oxidation of the molten metal can be suppressed.

[0013]

【effect】

According to the present invention, when replenishing the holding furnace with molten metal, the contact between the molten metal and the outside air is effectively achieved. It is possible to suppress the oxidation of the molten metal. Therefore, good quality You can get quality casting products.

[Brief explanation of drawings]

[Fig. 1] Cross-sectional view of a low-pressure casting device according to an embodiment of the present invention

FIG. 2 is a sectional view of the hot water supply stalk.

[Explanation of symbols] 1 Low pressure casting equipment 2 Cavity 3 Casting mold 4 Holding furnace 5 Molten metal 6 Storage room 7 Passage 8 Through hole 9 supply stalk 10 Bracket 11 Through hole 12 Hot water supply stalk

Claims (1)

[Scope of utility model registration request] 1. A holding furnace that stores molten metal to be supplied to a casting mold, a supply stalk that is immersed in the molten metal of the holding furnace and supplies the molten metal to the casting mold, and a supply stalk that has one end located inside the molten metal of the holding furnace. and a hot water supply stalk for supplying molten metal to the holding furnace, the other end of which communicates with the outside of the holding furnace, and the hot water supply stalk is provided with a communication hole that communicates with the gas phase inside the holding furnace. A low pressure casting device characterized by: