JPH065012Y2 - Tilt pouring container - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a tilting pouring container used for tilting pouring, and more specifically to a tilting pouring container capable of gently pouring molten metal without dropping it. Is.

[Prior Art] In gravity casting, when the molten metal is poured into the mold, the molten metal falls into a state where turbulent flow occurs, air is entrained, and oxides are easily formed. There is a problem that it is difficult to obtain a strong casting. Therefore, tilt pouring is performed to gently inject the molten metal into the mold so that turbulent flow is not generated.

Conventionally, tilted pouring is performed by pouring molten metal 15 into a pouring container 16 in which a refractory material is lined inside an iron rectangular container as shown in FIG. 11, and tip 17 of the pouring container 16 is inclined. Mold 11
This is performed by bringing the mold 11 and the pouring container 16 into one body by tilting the mold 11 and the pouring container 16 so that they are poured together.

[Problems to be solved by the invention]

However, in tilted pouring as described above, there is almost no consideration regarding the relationship between the amount of molten metal supplied from the pouring container according to the tilt angle and the casting defect, so when tilting the mold and pouring container together. , The molten metal in the pouring container is
It is poured into the mold regardless of the maximum amount (hereinafter referred to as the allowable amount of molten metal in the cavity) of which the mold can receive the molten metal without overflowing at the tilting angle. Therefore, except by chance, the amount of molten metal supplied from the pouring container is significantly larger or smaller than the allowable amount of molten metal in the mold cavity at a certain tilt angle, and as a result, the amount of molten metal supplied from the pouring container is If the amount of molten metal exceeds the allowable amount, the molten metal will overflow, and if the amount is less than the allowable amount, the molten metal will be dropped, causing a turbulent flow in the cavity. When turbulence occurs, the proportion of oxides generated increases in proportion to the degree of turbulence, and as a result, some of the oxides generated do not float to the riser at the top of the cavity and However, there is a problem that pressure leakage and crack defects are caused, and a cast product with excellent strength cannot be obtained.

The present invention is intended to solve the above problems, and an object of the present invention is to provide a tilting pouring container capable of pouring with less dropping.

[Means for solving problems]

The tilting pouring container of the present invention is a pouring container for use in tilting pouring, in which the tip of the pouring container is brought into contact with the spout of the mold, and the mold and the pouring container are integrally tilted for pouring. The internal volume of the pouring container, which exists above the horizontal plane at the height of the tip of the pouring container, exists below the horizontal plane at the height of the bottom edge of the mold, at all tilt angles in the tilting range. It is characterized in that it is equal to the internal volume of the cavity.

Here, "the mold and the pouring container are integrally tilted" means that the mold and the pouring container are tilted in a state where the both are integrated, that is, the tilt angle of both of them with respect to the initial state of tilting is tilting. It means the same from the beginning to the end.
Further, "the tip of the pouring container" means the molten metal outflow part (pouring port) of the container, and "the lower part of the spout" of the mold means the part of the periphery of the spout which is the lowest position during tilting. . In addition,
The term “cavity” of the mold means not only the product cavity, but also the cavity that can be filled with the molten metal, including the sprue and vents. The above definitions of “tip of pouring container”, “bottom edge of sprue” and “cavity” apply to the entire specification,
It is especially important for understanding the present invention.

The internal volume of the pouring container existing above the horizontal plane at the height of the tip of the pouring container in the tilted state is equal to the amount of molten metal supplied from the pouring container already injected into the cavity of the mold by tilting, and The internal volume of the cavity above the horizontal plane at the height of the lower edge of the gate must be equal to the amount of molten metal still remaining in the pouring container.

The shape of the tilting pouring container is not limited to one as long as it satisfies the above-mentioned volume condition.
That is, the shape is a shape in which a predetermined amount of molten metal is supplied at a predetermined tilt angle.

In order to determine the shape of the tilting pouring container, first, as shown in FIG. 6, the mold 1 is tilted by an angle θ ₁ so that the line a in FIG. Internal volume V of the cavity existing below (the plane where the a line is horizontal)
Ask for ₁ . If the cavity has a simple shape, this volume is
Calculated. When the cavity is complicated, for example, the mold is tilted to fill the molten metal, the casting is taken out after cooling, the weight of the casting is measured, and the volume is obtained. Furthermore, b, c ...
The angles of inclining the mold so that the f line is horizontal are θ ₂ , θ ₃ ...
The same operation is repeated by changing to θ ₆ and the corresponding changes in volume V ₂ , V ₃ ... V ₆ are obtained. Or, after processing the mold so that water does not leak, tilt the mold to fill it with water,
Obtain the volume of water that has entered, and change the angle at which the mold is tilted, and repeat the same operation. The tilt angle of the mold thus obtained and the internal volume of the cavity existing below the horizontal plane at the height of the lower edge of the sprue are plotted on a graph as shown in FIG. Find the amount.

Next, assuming an inner surface of a general vessel-shaped pouring container as shown in FIG. 8, θ ₁ , θ ₂ ... In order that the lines a, b ... F become horizontal as shown in FIG. When the pouring container is tilted at an angle of θ ₆ , the changes S ₁ , S ₂ ... S _{6 in} the internal volume of the pouring container existing above the horizontal plane at the height of the tip of the pouring container are respectively in the mold. The shape of the inner surface of the tilting pouring container is determined so as to be equal to the volume changes V ₁ , V ₂ ... V ₆ corresponding to the tilting angles θ ₁ , θ ₂ ... θ ₆ . Further, the calculation and the experiment may be used together. It is preferable that the inner surface of the tilted pouring container has a curved surface so that the molten metal flows out smoothly when the container is tilted.

[Action]

The tilting pouring container of the present invention has a tilting pouring container located above the horizontal plane at the height of the tip 7 of the pouring container 6 as shown in FIG. 10 (A) at all tilting angles in the tilting range. Since the internal volume S of 6 is equal to the internal volume V of the cavity existing below the horizontal plane at the height of the sprue lower edge 3a of the mold 1,
The tilted pouring container 6 is filled with molten metal, and its tip 7 is brought into contact with the sprue 3 of the mold, and the mold 1 and the pouring container 6 are integrally tilted so that the molten metal in the pouring container is placed in the cavity of the mold. After pouring, the molten metal is supplied to the cavity of the mold up to the allowable amount of molten metal at all tilt angles, and as shown in FIG.
In case of> V, overflow of molten metal does not occur. Further, at all tilt angles, the molten metal surface in the mold cavity almost reaches the lower edge of the sprue, and there is almost no level difference with the molten metal surface in the tilted pouring container whose tip is in contact with the molten metal spout. As a result, there is almost no drop of molten metal when S <V as shown in FIG. 10 (C).

〔Example〕

 The present invention will be described with reference to the drawings according to an embodiment.

First, in order to determine the shape of the tilt pouring container, the internal volume of the cavity existing below the horizontal plane at the height of the lower edge of the sprue of the mold was determined for each predetermined tilt angle.

As shown in FIG. 4, the mold 1 was tilted by θ degrees and the cavity 2 of the mold 1 was filled with the molten metal 5 to the maximum extent without overflowing from the sprue 3. After cooling, the casting was taken out and the weight of the casting was measured. . Reference numeral 4 in the figure indicates a core. The tilt angle θ was changed over the tilt range, and the same operation as above was repeated. The allowable amount of molten metal was determined from the measured weight. The allowable amount of molten metal and the tilt angle were plotted on a graph to obtain the graph shown in FIG.

Next, as shown in FIG. 1, the internal shape of the tilting pouring container 6 is determined based on this graph so that the amount of molten metal supplied from the pouring container is equal to the allowable amount of molten metal in the cavity at all tilting angles in the tilting range. The shape is as follows. In the figure, 8 indicates a bottom surface. The tilting pouring container may have another shape as long as the above conditions are satisfied.

Next, casting using the tilt pouring container 6 will be described. As shown in FIG. 1, the tip 7 of the tilting pouring container 6 containing the molten metal 5 made of an aluminum alloy is connected to the sprue 3 of the mold 1.
Then, the mold 1 and the tilting pouring container 6 were tilted integrally with each other while keeping them in contact with each other. Since the amount of molten metal supplied from the pouring container is equal to the allowable amount of molten metal in the cavity, the molten metal 5 supplied from the tilting pouring container 6 enters the cavity 2 of the mold 1 and its molten metal surface 9a reaches the lower edge 3a of the spout. did. Therefore, the molten metal surface 9b of the tilted pouring container 6 and the molten metal surface in the cavity 2
There was almost no difference in the height of 9a, and the molten metal 5 was not dropped. Thus tilted and poured, the cavity 2 was filled with the molten metal as shown in FIG. The mold 1 has a gas vent (not shown). Also, when tilting,
When the pouring speed becomes extremely high, turbulent flow occurs and air is entrained, so the tilting speed can be arbitrarily adjusted within a range where such a situation does not occur.

In the cast product obtained as described above, since the molten metal did not drop, the oxide was less generated and the strength was excellent.

[Effect of device]

As described above, in the tilting pouring container of the present invention, at all tilt angles, the internal volume of the pouring container existing above the horizontal plane at the height of the tip of the pouring container has the height of the lower edge of the spout of the mold. Since it is equal to the internal volume of the cavity below the horizontal plane, the amount of molten metal supplied from the pouring container is equal to the allowable amount of molten metal in the cavity, and when tilted pouring is performed using the container of the present invention, Overflow as well as pouring of molten metal hardly occur. Therefore, it is possible to minimize the generation of oxides due to the dropping, to obtain a high-strength casting, and to eliminate the leak failure.

Further, since the molten metal does not fall, it is possible to increase the pouring speed without increasing the production of oxides,
The casting cycle can be shortened and the productivity can be improved.

[Brief description of drawings]

FIG. 1 is a sectional view of a mold and tilting pouring container before pouring according to an embodiment of the present invention, and FIG. 2 is a sectional view of a mold and tilting pouring container during pouring according to an embodiment of the present invention, FIG. 3 is a sectional view of a mold and a tilted pouring container at the completion of pouring according to an embodiment of the present invention, and FIG. 4 is a sectional view of a mold for explaining an allowable amount of molten metal measurement according to an embodiment of the present invention, FIG. 5 is a graph showing the relationship between the allowable amount of molten metal and the tilting angle obtained by the embodiment of the present invention, and FIGS. 6 to 9 are explanatory views of the designing method of the tilting pouring container according to the present invention. FIGS. (A), (B) and (C) are views for explaining the function and effect of the present invention, and FIG. 11 is a sectional view of a conventional tilting pouring container and a mold. In the figure, 1 ... Mold, 2 ... Cavity 3 ... Gate, 3a ... Gate bottom edge 5 ... Molten metal, 6 ... Tilt pouring container 7 ... Tip, 8 ... Bottom

Claims (1)

[Scope of utility model registration request] 1. A tip of a pouring container is brought into contact with a sprue of a mold,
A pouring container used for tilt pouring, in which the mold and pouring container are tilted integrally to pour the molten metal, and at a tilt angle in all tilting ranges, a horizontal plane at the height of the tip of the pouring container. The tilting pouring container, wherein the internal volume of the pouring container located above is equal to the internal volume of the cavity located below the horizontal plane at the height of the lower edge of the spout of the mold.