JPH0216846Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a low-pressure casting device that supplies compressed air to the surface of molten metal in a crucible to apply pressure and fill the molten metal into a mold via a hot water supply pipe. .

(Prior art) In conventional low-pressure casting equipment, compressed air is supplied to the surface of the molten metal in the crucible to apply pressure, and after filling the molten metal into the mold, the above-mentioned application is performed until the molten metal in the mold solidifies. It is necessary to maintain the pressure state, therefore,
There was a problem in that the time required for one cycle of casting work became longer. For this reason, a method is used in which a molten metal cutoff mechanism is installed between the mold and the hot water pipe, and after the mold is filled with molten metal, the hot water supply port of the mold is immediately closed, and the next empty mold is connected to the hot water pipe. However, a low-pressure casting device equipped with a shut-off mechanism that can operate without problems and reliably shut off the molten metal has not been realized.

(Purpose of the invention) This invention was made in view of the above circumstances.
It is an object of the present invention to provide a low-pressure casting device equipped with a molten metal shutoff mechanism that operates without any trouble and can reliably shut off molten metal.

(Structure of the invention) Hereinafter, the structure of an embodiment of the invention will be described in detail based on the drawings. Reference numeral 1 denotes a horizontally split mold which is arranged to be movable up and down and horizontally by a mechanism not shown, and the mold 1 has a cavity 2 and a hot water supply port 3 formed therein. Then, on the bottom surface of the mold 1,
A guide cylinder 5 having a rectangular cross section and having ceramic sliding plates 4a and 4b adhered to its inner surface is mounted horizontally, and the left end of the guide cylinder 5 is closed.
Further, in the guide tube 5 including the sliding plates 4a, 4b, directly below the hot water supply port 3, there are molten metal passage holes 6a, 6b whose center line and inner diameter are the same as those of the hot water supply port 3.
Furthermore, a rectangular plate-shaped slide gate 8 having a communication hole 7 for communicating the molten metal passage holes 6a and 6b with each other is slidably fitted in the guide tube 5. The tip of a piston rod 10a of a horizontal cylinder 10 is connected to the side surface of the mold 1 through an intermediary member 9 wrapped around the slide gate 8, and the cylinder 10 is connected to the bottom surface of the mold 1 through a bracket 11. It is installed. Further, a drain hole 12 having approximately the same diameter as the hot water supply port 3 is formed at the bottom of the guide tube 5 including the sliding plate 4b. It is provided at a position where it joins with the communication hole 7 when moved. 13 is installed on a crucible (not shown) and guides the mold 1 into a guide tube 5.
The crucible lid 13 has a hot water supply pipe 14 having a flange at the upper end in the center of the crucible lid 13.
is provided vertically through the crucible lid 1 with its upper surface level being the same as that of the crucible lid 1. In addition, a drain pipe 15 having a flange at the upper end is installed in the crucible cover 1 with the same distance as that between the molten metal passing hole 6b and the drain hole 12, and the upper surface level is the same as that of the crucible cover 13. The inner diameter of the drain pipe 15 is larger than that of the drain hole 12. 16 is a ventilation hole.

(Operation of the device) Next, the operation of the device configured as described above will be explained.

In FIG. 1, when compressed air is supplied to the lower surface of the crucible lid 13 and pressure is applied to the upper surface of the molten metal M, the molten metal M flows through the hot water supply pipe 14, the molten metal passage hole 6b, the communication hole 7,
The molten metal passes through the molten metal passage hole 6a and the molten metal inlet 3 in order, is raised, and is filled into the cavity 2. After pouring the molten metal, when the cylinder 10 is extended and the slide gate 8 is moved to the left as shown in FIG. It was closed,
As a result, the molten metal M in the communication hole 7 is discharged into the crucible (not shown) through the discharge pipe 15, and the molten metal M in the cavity 2 and the hot water supply port 3 is held as is. Next, the mold 1 filled with molten metal is raised and moved horizontally, and then the other mold 1 whose cavity 2 is empty is moved directly above the crucible lid 13 and lowered to guide it. Put the tube 5 into the crucible lid 13
The molten metal passage hole 6b and the molten metal discharge hole 12 are connected to the hot water supply pipe 14 and the hot water discharge pipe 15, respectively, while being placed on top and in contact with each other. By repeating the above operations, it is possible to pour metal into each of the plurality of molds 1, 1 in a short time.

Note that the mold 1 may be a vertically split mold.

(Effects of the invention) As is clear from the above explanation, the present invention is equipped with a slide gate that opens and closes the hot water supply port of the mold on the lower surface of the mold that can be raised and lowered, and a hot water supply pipe and a water supply pipe on the crucible lid. Since the molten metal discharge pipe is inserted with the same distance as the moving distance of the slide gate's communication hole, and the top surface level is the same as that of the crucible lid, the molten metal inlet can be closed after pouring the molten metal into the mold. , it becomes possible to move the filled mold from the crucible and to move another empty mold onto the crucible without solidifying the molten metal in the mold, thus making it possible to move one empty mold onto the crucible.
The cycle time can be significantly shortened, and since the molten metal in the communicating hole of the slide gate is returned to the crucible, the molten metal will not be scattered around, providing excellent practical effects.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIGS. 1 and 2 are partially cutaway sectional front views also showing the operating state. 1: Mold, 3: Hot water supply port, 5: Guide tube, 6a, 6
b: Molten metal passage hole, 7: Communication hole, 8: Slide gate, 12: Molten metal discharge hole, 14: Molten metal supply pipe, 15: Molten metal discharge pipe.

Claims (1)

[Scope of utility model registration request] A horizontal guide tube 5 is attached to the lower surface of the mold 1 which is movably disposed above the crucible lid 13, and the center line and inner diameter of the mold 1 are set on the ceiling and bottom of the guide tube 5. Molten metal passing holes 6 identical to those of the hot water supply port 3
A slide gate 8 is slidably fitted into the guide tube 5 and has communication holes 7 that can be joined to the molten metal passage holes 6a and 6b at both ends thereof, respectively, and the guide tube At the bottom of tube 5,
A drain hole 12 that can be connected and connected to the communication hole 7 is formed, and the crucible lid 13 has an upper surface level that is connected to the crucible lid 1.
3, the hot water supply pipe 14 is installed vertically through the hot water supply pipe 14, and the interval with the hot water supply pipe 14 is set to the molten metal passing hole 6.
A hot water drain pipe 15 whose spacing is the same as that between b and the hot water drain hole 12.
A low pressure casting device characterized by being equipped with.