JPH0441043A - Feeder structure in mold - Google Patents

Abstract

PURPOSE:To easily execute cutting at between a casting and solidified material of a feeder head for short time by forming a connecting part between the feeder head and cavity with a porous refractory and reducing area of the connecting part. CONSTITUTION:Into the cavity 2 in a mold 1, molten metal 5 is poured through a sprue and the feeder head 3. The molten metal 5 is poured into the cavity 2 while rectifying with plural holes 4A at the connecting part 4 and filtrating slag. Then, the molten metal 5 in the cavity 2 is cooled and solidified and the volume is shrunk, but the molten metal 5 is supplemented in the cavity 2 from the feeder head 3 by this volume. The casting 6 is cast in such way, but to the casting 6, the solidified material 7 of molten metal in the feeder head 5 is attached through the small diameter bar-state connecting part 8 according to the plural holes 4A at the connecting part 4 in the mold 1. Then, by cutting the connecting part 8 with a cutting grindstone 9, the casting 6 and the solidified material 7 are cut off. Then, as the connecting part 8 is small diameter bar-state and collapsible state before cutting, the cutting is facilitated.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a riser structure in a mold.

[Background of the invention]

When molten metal is injected into a mold cavity and cooled and solidified to cast a casting, the volume of the molten metal injected into the cavity decreases during cooling and solidification, so the molten metal must be replenished into the cavity.

For this purpose, a feeder is connected to the cavity, the feeder is filled with molten metal, and as the volume of the molten metal in the cavity decreases due to cooling and solidification, the molten metal is replenished from the feeder into the cavity by a head difference. After casting in this way, the casting is removed from the mold, but at this time, the casting is accompanied by the solidified molten metal that was filled in the riser.
It is necessary to separate the solidified material from the casting.

[Conventional issues]

In conventional molds, the area of communication between the feeder and the cavity is large, and therefore the cross section of the communication area between the casting and the solidified molten metal in the feeder is also large, and the area between the casting and the solidified material is large. It took a lot of time and effort to separate the blades, and the cutting wheel used for the separation was also subject to considerable wear and tear.

[Means to solve the problem]

The present invention, as a means for solving the above-mentioned conventional problems,
Provided is a feeder structure in a mold that is a feeder communicating with a cavity formed in a mold, in which a communication portion between the feeder and the cavity is formed of a porous refractory, and the area of the communication port is reduced. It is something to do.

[Effect]

Molten metal is injected into a cavity in the mold through a riser and cooled and solidified to form a casting.As the molten metal in the cavity cools and solidifies, its volume decreases, so the riser is filled with molten metal. The molten metal is replenished into the cavity by the head difference. After casting, the obtained casting is taken out of the mold, but since the communication part between the riser and the cavity of the mold is made of porous refractory, in order to reduce the area of the communication port, Even if the casting has a complicated shape, such as a structure consisting of many holes or a half-moon shape, the connecting portion easily collapses, so that the casting can be easily removed from the mold. Then, the solidified material of the molten metal in the riser accompanying the casting is separated from the casting, and in the present invention, the area of communication between the casting and the solidified material is small, so separation does not require much effort. For example, if the area of the connection port between the riser and the cavity is 30% of the conventional area, the time required for separation is 1
Becomes 15. In addition, if the communication port between the cavity and the riser is made of a structure consisting of many holes, when the molten metal is injected into the cavity through the riser, the molten metal flows quietly and smoothly into the cavity due to the static flow effect due to the many holes. Easy to spread evenly.

Further, slag in the molten metal is also removed by the large number of holes. Further, since the casting and the solidified product are connected by a large number of small-diameter rod-shaped connecting portions originating from the large number of holes, the casting and the solidified product can be separated by cutting the small-diameter rod. Furthermore, when the communication port between the cavity and the feeder is connected through a half-moon-shaped communication port, the casting and the solidified product are connected by a connecting portion having a half-moon-shaped cross section originating from the half-moon-shaped connecting port. When is half-moon shaped, the contact area between the cutting wheel and the connecting portion is small, and cutting is performed in a shearing manner.

〔Example〕

To explain the present invention with reference to an embodiment shown in FIGS. 1 to 3, a mold (1) is provided with a cavity (2) having a shape corresponding to the intended casting. ) is connected to one end of the feeder (3) from above. And between the cavity (2) and the riser (3), there is a second
As shown in the figure, there is a connecting part (4) made of porous refractory material in which a large number of holes (4) A are formed. The connecting portion (4) made of the porous large material is manufactured by, for example, a shell molding method.

A molten metal (5) of, for example, 5US304 is injected into the cavity (2) of the mold (1) through a sprue and riser (3), which are not shown. The molten metal (5) flows statically through the many holes (4) A of the connecting part (4), is filtered to remove slag, and is injected into the cavity (2). The molten metal (5) in the cavity (2) is cooled, solidified, and reduced in volume, and the molten metal (5) is replenished into the cavity (2) from the feeder (3) accordingly.

In this way, a casting (6) as shown in FIG. 3 is cast.
A small-diameter rod-shaped connection part (8) originating from the numerous holes (4) and 8.
The solidified material (7) of the molten metal in the riser (3) is attached to the feeder via the feeder. Therefore, as shown in FIG. 3, by cutting the connecting part (8) with a cutting wheel (9),
) and the coagulum (7) are separated. The connecting portion (8) is made of porous refractory material, has a small diameter rod shape, and is in a collapsed state before being cut, so that it can be easily cut with the cutting wheel (9).

Another embodiment of the invention is shown in FIGS. 4 and 5. In this example, in the mold (1), between the cavity (2) and the riser (3), there is a connection made of porous refractory material with a half-moon-shaped communication port (4) B formed therein as shown in FIG. part(
4) intervenes.

As shown in Fig. 5, the casting (6) cast by the mold (1) is connected to the solidified molten metal (7) in the riser (3) by a connecting part (8) A having a half-moon shape in cross section. There is. In order to separate the casting (6) and the solidified material (7), the connecting portion (
8) What is necessary is to cut A with a cutting grindstone (9), but the connecting portion (8) A has a half-moon shape in cross section.

Therefore, the contact area between the cutting wheel (9) and the connecting portion (8) A is small, and the cutting is performed in a shearing manner, so that the cutting is easy.

Further embodiments of the present invention are shown in FIGS. 6 and 7. In this example, the mold (1) has a cavity (2).
) and the riser (3), as shown in FIG. 6, there is interposed a communication part (4) made of porous refractory material and having an arcuate communication port (4)C formed therein.

As shown in Fig. 7, the casting (6) cast by the mold (1) is connected to the solidified molten metal (7) in the riser (3) by a connecting part (8) B having an arcuate cross section. . In order to separate the casting (6) and the solidified material (7), the connecting portion (8) is
) B can be cut using the cutting wheel (9), but the connecting portion (8) B has an arcuate cross section, so the contact area between the cutting wheel (9) and the connecting portion (8) B is It is easy to cut because it is small and cutting is done by shearing.

〔Effect of the invention〕

Therefore, in the present invention, the casting and the solidified molten metal in the feeder can be cut extremely easily and in a short time, and wear and tear on the cutting wheel is also reduced.

[Brief explanation of drawings]

15 to 3 show an embodiment of the present invention, FIG. 1 is a side sectional view of the mold, and FIG.
A sectional view, FIG. 3 is an explanatory diagram of the state in which the casting and the solidified molten metal in the riser are separated, FIGS. 4 and 5 show other embodiments, and FIG. 2 is a sectional view corresponding to FIG. 2, FIG. 5 is an explanatory view of a state in which the casting and the solidified molten metal in the riser are separated, and FIGS. 6 and 7 are further examples. FIG. 6 is a sectional view corresponding to FIG. 2, and FIG. 7 is an explanatory diagram of a state in which the casting and the solidified molten metal in the riser are separated. In the figure, (1)...Mold, (2)...Cavity, (3)...Riser, (4)...Connection part, (4)A, (4) B, (4) C... Liaison patent applicant Daido Steel Co., Ltd. Figure 3

Claims (1)

[Claims] 1. A riser that communicates with the cavity formed in the mold, the communication portion between the riser and the cavity is made of porous refractory, and the area of the communication port is reduced. A riser structure 2 in a mold characterized in that: a feeder structure 3 in a mold according to claim 1, wherein a communication port between the riser and the cavity has a structure consisting of a large number of holes; The feeder structure in the mold according to claim 1, wherein the communication port with the cavity is half-moon shaped.