JPH03466A - Method for casting product using lost foam pattern - Google Patents

Abstract

PURPOSE:To save casting of a neck part and to improve the product yield by using embedding member consisting of sprue, runner and lost foam pattern to form a casting body, dipping a holding member so as to expose a holding part while poured molten metal does not solidify and pulling out after solidified- sticking. CONSTITUTION:The embedding member 4 composed of the sprue 1, runner 2 and lost foam pattern 3 is embedded into packing material 6 contained in a flask 5, and the sprue 1 is exposed from the packing material 6 and the pouring of molten metal is executed through the sprue 1 to form the casting body 7. While the molten metal exists in the runner 2 part and not yet solidified, the holding member 9 is pushed into the molten metal in the runner 2 directing the main body 11 downward and the holding part 8 upward. Successively, the molten metal is cooled and solidified in the room temp., and the holding member 9 is stuck to the casting body 7 with solidification. Then, hook in hanging device is hung to the holding part 8 to lift up the casting body 7. By this method, the casting body 7 is pulled out of the packing material 6.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Use This invention is used in casting various mechanical parts. This invention relates to a casting method using a fugitive model.

2. Description of the Related Art Conventionally, this type of casting method has been carried out as shown in FIGS. 7 to 9, for example.

In the figure, reference numeral 5 designates a flask, which is made of iron and is shaped like a container, placed on a moving roller 21, and a filler material 6 such as sand is stored inside the flask.

3 is a fugitive model, which is made of expanded polystyrene. The model 3 is connected to a system consisting of a runner 2 and a sprue 1 to form a buried member 4. In this case, the runner 2 is made of expanded polystyrene, for example, and the sprue 1 is formed by binding sand with a synthetic resin binding agent as shown in the figure.

Note that 21 is a vent cylinder, which is a hollow cylinder in which a slit 22 or a small hole (not shown) is formed. 2
Reference numeral 3 denotes an ignition device, 624 is provided at a position corresponding to the upper end of the vent pipe 21, molten metal is brought from the melting furnace, and 25 is an injection part thereof.
3 shows an example, and the present invention is not limited to this. Instead, a suction pump may be connected to the tip of the vent cylinder 21.

In FIG. 7, molten gold w, 24 is supplied to the sprue 1 through the injection part 25, passes through the runner 2 and reaches the evanescent model 3, as shown in FIG. Both are thermally decomposed and exposed to gas, followed by casting as shown in the figure.

The generated gas then passes through the gaps in the filler 6 and vents [
21 enters the inside through the slit 22 and rises,
The gas is combusted by the ignition device 23, and due to the pressure drop generated by the combustion, the gas present in the gaps between the fillers 6 is suctioned. Note that instead of the suction by combustion, suction may be performed by the pump (not shown).

Next, the casting formed in the above manner is then filled with the filler material 6.
The sprue 1 is pulled out from inside, but in this case, as shown in FIG. crushed by During the above-mentioned drawing, the flask 5 or the clamping device 26 is vibrated by a vibrating device, although not shown.

Problems to be Solved by the Invention However, the above conventional casting method has the following drawbacks. This is because the I* product of the neck portion 27 is large compared to the volume of the fugitive model 3, resulting in poor product yield. The neck portion 27 weighs as much as 7 kg to 15 kg, for example, and requires a large amount of electric power to dissolve it. The above-mentioned poor yield cannot be ignored if the product is relatively small. However, since the neck portion 27 is heavy, handling of the cast body is troublesome.

This invention was made in order to solve the above-mentioned problems, and its purpose is to eliminate the need for the large neck portion 27 as described in the conventional example;
It is an object of the present invention to provide a method for producing a casting using a fugitive model, which does not require a large amount of electric power for the melting of the melting material, and therefore has a high product yield. Another object of the present invention is to provide a casting method using a fugitive model, in which handling of the casting is easier than in the conventional method.

Means for Solving the Problems This invention that achieves the above objectives is as follows:
Sprue 1. Buried component 4 consisting of IIJ road 2 and disappearing model 3
is buried in a filler 6 housed in a flask 5, and the sprue 1 is exposed from the filler 6, and the sprue 1 is poured with molten metal, and the poured metal is poured into the hot water of the poured metal. is in the runner 2 and is stopped in a state where the sprue 1 is not filled, and casting is performed to form a cast body 7.

Before the poured metal of the cast body 7 solidifies, the holding member 9 having the holding part 8 is inserted into the hot water in the runner 2.
is exposed and buried, the hot water is hardened, the holding member 9 is fixed to the cast body 7 by the solidification, and then the lifting and lowering device 1 is connected to the holding part 8 of the holding member 9.
This is a method of casting a casting using a fugitive model, in which the cast body 7 is extracted from the filler 6 by 0.

Embodiment In FIG. 1, l is a sprue, 2 is a runner, and 3 is a dissipative IK.
? , 4 is an embedded member consisting of the three members 1, 2, and 3, and 5 is a flask, which is placed on a moving roller 20. Further, 6 indicates a filler such as sand. In the drawing showing the implementation m1 of the present invention, many parts are the same as the drawing showing the conventional example, so the same parts as the drawing showing the conventional example. shall have the same drawing numbers and names. Also, the functions of the same parts are the same. In order to avoid duplication, detailed explanations thereof will be omitted.

Next, reference numeral 9 denotes a holding member having a holding portion 8, in which various latches were formed as shown in FIG. 6 as an example. In the figure, 9a is a rod-shaped wood 11 with a flange 12, a holding member 9b is a main body 11 with a taper that becomes thicker toward the tip, and a member 9c is a main body. 11 with a recess 13 formed therein. In addition, these are formed in advance from the same material as the molten metal, and as shown in FIG. , before it solidifies, place the holding member 9 in the runner 2 as shown in FIG. 4, with the book 111cII facing down and the holding portion 8 facing up, as shown in FIG. This pushing may be done manually or by using a linear actuator (not shown), and FIG. 4 shows the state in which it is pushed in in this way. Then, the hot water is cooled and solidified at room temperature in the state shown in FIG. 4, and the holding member 9 is fixed to the cast body 7 by the solidification.

Then, as shown in FIG. 5, the hook 14 of the lifting and lowering device 10 is hung on the holding portion 8 and lifted. As a result, the cast body 7 is extracted from the filling material 6.

At this time, the flask 5 or the lifting and lowering device 10,
Vibration is applied by a vibration device (not shown).

Effects of the Invention This invention is constructed as described above, and the hot water for pouring is poured into the runner 2.
The pouring is stopped and casting is performed in a state where the molten metal is in the runner and the sprue 1 is not filled, to form a cast body 7, and before the molten metal in the cast body 7 solidifies, , the holding member 9 having the holding part 8 is buried with the holding part 8 exposed, the hot water is solidified, the holding member 9 is fixed to the cast body 7 by the solidification, and then the holding member 9 is buried. Holding part 8
The casting body 7 is lifted by a lifting and lowering device lO connected to
By extracting the filler 6 from the filler 6, it is possible to omit the casting of the neck portion 27 shown in the conventional example, thereby greatly improving the product yield. It is possible to save a large amount of electricity for melting metals. Furthermore, since the weight of the conventional neck portion 27 is greatly reduced, the casting body 7 can be easily removed.

[Brief explanation of the drawing]

1 to 5 show an embodiment of the present invention. 7 to 9 are diagrams showing the various holding members used, and sequentially show the steps of a conventional casting method using a fugitive model. 1... Sprue 2... Runway 3... Erasable model 4... Buried member 5... Flask 6... Filler cast body holding part holding member lifting and lowering device

Claims (1)

[Claims] A buried member (4) consisting of a sprue (1), a runner (2), and a fugitive model (3) is placed in a filler (6) housed in a flask (5).
), and the sprue (1) is buried in the filler (6).
pouring molten metal into the sprue (1), with the poured metal in the runner (2) and not filling the sprue (1); to form a cast body (7), and before the poured metal of the cast body (7) solidifies, the hot water in the runner (2) is provided with a holding part (8). The holding member (9) is attached to the holding portion (8).
is exposed and buried, the hot water is solidified, and the solidification causes the holding member (9) to be fixed to the cast body (7), and then connected to the holding part (8) of the holding member (9). A method for casting a casting using a fugitive model, characterized in that the cast body (7) is extracted from the filler (6) using a lifting and lowering device 10.