JPH0528550U - Pressure control casting equipment - Google Patents

Abstract

(57) [Abstract] [Purpose] It is easy to control the mold temperature when casting with a mold or shell mold using a pressure controlled casting device, and there are few casting defects such as shrinkage cavities and pinholes as directional solidification. A sound casting is produced. [Structure] A partition plate for partitioning the space on the mold side, the space for the air supply port, and the space for the air supply port in the pressure vessel by providing at least one hole prevents the temperature change of the mold due to gas.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a pressure controlled casting apparatus for producing high quality castings, and more particularly to a pressure controlled casting apparatus for preventing local cooling of a mold by a pressurized gas.

[0002]

[Prior Art]

 There is a pressure-controlled casting apparatus in which a mold is placed in a pressure vessel and the pressure vessel is pressurized or depressurized. This pressure-controlled casting apparatus pours the molten metal into the mold cavity through the hot water supply pipe and solidifies the poured molten metal due to the pressure difference between the pressure container on which the mold is placed and another pressure container that holds the molten metal. It is to obtain a cast product. When pressure control is performed by pressurizing and depressurizing the inside of this pressure vessel with gas, the gas from the air supply port and exhaust port is concentrated at a specific location, and there is a position where the gas flow velocity is high. ..

[0003]

[Problems to be solved by the device]

 If the mold is placed at a position where such a gas flows, the mold is locally cooled, the mold temperature is not uniformly distributed, and the mold temperature control becomes difficult. As a result, casting defects and non-uniform structures occur in the castings produced.

Further, when a mold such as a sand mold that easily collapses is placed in the pressure vessel, a gas having a high flow velocity collides with the mold, and the mold is easily broken.

An object of the present invention is to provide a pressure-controlled casting apparatus that prevents local cooling of a mold by gas and that does not collapse due to collision of gas when using a mold that easily collapses.

[0006]

[Means for Solving the Problems]

 In order to solve the above problem, the present inventor analyzed the flow state of gas in the pressure vessel. As a result, the conventional pressure-controlled casting apparatus has a gas passage in the die base, and the cross-sectional area of the pressure control gas supply port and exhaust port is set from this passage to the pressure vessel on which the mold is placed. small. For this reason, it was found that when the gas passed through these small inlets and outlets, the flow velocity became extremely high, and when the mold was placed in a location where the gas flow velocity was high, the mold was locally cooled. .. Then, in order to prevent the local cooling of the mold, it was found that it is effective to relax the gas flow velocity or not place the mold in a region where the gas flow velocity is high.

That is, according to the present invention, in a pressure control casting device in which a mold is placed in a pressure vessel and the pressure is controlled in association with the casting process of a casting or the progress of solidification, It is characterized in that a mold temperature stabilizing means for preventing a temperature change of the mold due to the gas is provided between the inlet and outlet of the gas to which pressure is applied and the mold.

Further, the mold temperature stabilizing means has a partition plate which is provided around the mold with at least one hole to partition the space on the mold side from the space for the air supply port and the discharge port. Characterize.

[0009]

[Action]

 The mold temperature stabilizing means prevents the gas flowing from the air supply port from directly colliding with the mold, thereby preventing a local mold temperature change of the casting mold and collapse of the mold.

Further, at least one or more holes are provided, and the mold temperature stabilizing means which is in the periphery of the mold and communicates with the mold from the air supply port and the gas discharge port increases the cross-sectional area of the gas supply port and the gas exhaust port. It is possible to reduce the flow rate of the gas and reduce the time for supplying and discharging the gas.

In a mold, such as a mold or a shell mold, which needs to be maintained at a constant temperature condition, low-temperature gas does not directly collide with a local part of the mold, so that a uniform mold temperature distribution can be obtained and mold temperature control can be performed. It will be easier. Therefore, the conditions for directional solidification are easily obtained, and a sound casting with few casting defects such as shrinkage cavities and pinholes can be manufactured.

Further, the mold temperature stabilizing means around the mold, which communicates with the mold from the air supply port and the discharge port, can be arranged along the inner wall of the pressure vessel, and the shape of the mold to be placed is fixed. In consideration of the layout of peripheral equipment, casting equipment, etc., select the optimal shape and dimension so that it does not interfere with casting work and its associated work.

[0013]

【Example】

 Hereinafter, the present invention will be described in detail with reference to an embodiment shown in FIGS. (Embodiment 1) FIG. 1 is a sectional view of a pressure control casting apparatus according to an embodiment of the present invention. This pressure control casting apparatus comprises a holding furnace 10 for heating and holding a molten metal 11 or a non-metal melt 11, a pressure vessel 9 for mounting the holding furnace 10, and a mold 2A placed in the pressure vessel 1. 2 communicating with the cavity 2B of the pressure vessel, pressure control means (not shown) by the gas introduced into the pressure vessel 9 from the air supply / exhaust port 8, and gas control by means of the pressure control means (not shown) in the pressure vessel 1. Air supply pipe 5 and air supply port 4 for introducing gas, exhaust port 6 and exhaust pipe 7 for exhausting gas from the pressure vessel 1 by means of pressure control means (not shown), and mold temperature stabilization that prevents gas from colliding with the casting mold. It comprises means 3.

In this embodiment, two air supply pipes 5 are provided, and the air supply port 4 at the tip of the air supply pipe 5 is arranged above the mold. Therefore, the gas does not directly collide with the mold 2A, and the upper part of the pressure container 1 is first filled, and then the lower part of the pressure container 1 is sequentially filled. Further, since the exhaust port 6 is also installed at a position higher than the mold 2A, the gas at the time of exhaust flows from the entire lower part of the pressure vessel 1 toward the upper exhaust port 6. Therefore, the mold 2A was not locally cooled, and it was possible to prevent the mold from breaking.

It should be noted that the shape of the air supply port 3 corresponds to the shape of the mold, and is made into a shape having a circle, an ellipse, a square, or a free curve, so that the auxiliary work during casting becomes easy. ..

(Embodiment 2) FIG. 2 is a sectional view of a pressure control casting apparatus showing another embodiment of the present invention. A partition plate is provided as the mold temperature stabilizing means 3 between the air supply port 3 and the exhaust port 6 and the mold 1A. The partition plate is connected to the air supply port 4 and the exhaust port 6 at its lower part, covers the casting mold 2A as a whole, and has a large number of small holes 13 at the upper part of the mold 2A.

The gas introduced from the air supply port 3 is gently rectified by the small holes 13 in the space in which the mold 1A is present. Therefore, the mold breakage of the mold 1A and the local temperature decrease are prevented. At the time of exhaust, gas flows from the space in which the mold 1A is present to the exhaust port 6 through the small hole 13 above, so that the temperature condition of the mold 1A is stabilized without locally cooling the mold 1A.

[0018]

[Effect of the device]

 As described above, the pressure control having the mold temperature stabilizing means for preventing the temperature change of the mold due to the gas is provided between the mold and the gas inlet / outlet for applying the pressure to the pressure vessel of the present invention. In the casting equipment, the gas that flows in and out of the air supply port and the exhaust port does not directly collide with the mold, preventing local mold temperature changes and mold collapse. Therefore, a uniform mold temperature distribution can be obtained even in molds and shell molds, mold temperature control is easy, and directional solidification conditions can be easily obtained, and sound castings with few casting defects such as shrinkage cavities and pinholes can be obtained. Can be manufactured.

Further, by arranging the mold temperature stabilizing means along the inner wall of the pressure vessel around the mold in the optimum shape, the casting efficiency is improved without disturbing the casting operation and its attendant work.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a pressure control casting device showing an embodiment of the present invention.

FIG. 2 is a sectional view of a pressure control casting device showing another embodiment of the present invention.

[Explanation of symbols]

 1 Pressure Vessel 1A Mold 1B Cavity 3 Type Temperature Stabilizing Means 4 Air Supply Port 5 Air Supply Pipe 6 Exhaust Port 7 Exhaust Pipe 8 Air Supply / Exhaust Port 9 Pressure Vessel 10 Holding Furnace 11 Molten Metal 12 Hot Water Supply Pipe 13 Small Hole

Claims (2)

[Scope of utility model registration request] 1. A pressure-controlled casting apparatus in which a mold is placed in a pressure vessel, and the pressure is controlled in conjunction with the casting process or solidification progress of a casting, in a gas for applying pressure to the pressure vessel. A pressure controlled casting apparatus comprising a mold temperature stabilizing means for preventing a temperature change of the mold due to a gas between the air supply port and the exhaust port and the mold. 2. The mold temperature stabilizing means has a partition plate which is provided around the mold and has at least one hole to separate the space on the mold side from the space for the air supply port and the discharge port. The pressure controlled casting apparatus according to claim 1, which is characterized in that.